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HomeMy WebLinkAboutApplication MaterialsGARF!ËLD COMMU RECEIVEü Community Development Department l0g 8th Stree! Suite 401 Glenwood Springs, CO 81601 (970194s-82L2 www.garfield-countv.com TYPE OF GRADING INVOLVED PARTIES tr MAJOR tr MINoR Address: 1800 Larimer Street, Suite 1300 Property owner: Chad Campbell, Xcel Energy Mailing EmailAddress . Chad. Campbell@xcelenergy.com plrone, P02 1294-2177 contractor: Jerry Wedemeyer, PAR West Emait Addrerr. jwedemeyer@parelectric.com 324-1100pnon"rl20 ) Mailing Address 725Tower Rd Aurora, CO 80011 Phone NA NAMailing Address Architect: NA EmailAddrer* NA n""r. Brian Brown, HDR Engineering, lnc Address: 419 Canyon Ave., Suite 316 Fort Collins, CO 80521 Email Addrer' Brian. brown@hdrinc.com 215-4616Phone:Engi Mailing 70 PROJECT NAME AND LOCATION Xcel T-Line 6670 Phase 1 DEBE to UNA Rebuild Describe Work: To replace approximately 4.5 miles of an existing transmission line, located in Garfield County, with new structures and cables. The planned project alignment will be Job Address. West end (39.216777 ,.108.95855 ) mainly located within the existing alignment. East end (39.242250, -108.6467) Numerous parcels NA 552,000 Project Na Earthwork (square feet):Earthwork (Cubic Yards):870 _Block Assessor's Parcel Number: suu. NA Lot NA ALL UTILITIES MUST BE LOCATED PRIOR TO ANY GRADING NOTICE Authoritv. ThisapplicationforaBuildingPermitmustbesignedbytheOwneroftheproperty,describedabove,or anauthorizedagent. lfthesignaturebelowisnotthatoftheOwner,aseparateletterofauthority,signedbythe Owner, must be provided with this Application. Legal Access. ABuildingPerm¡tcannotbeissuedwithoutproof of legal andadequateaccesstothepropertyfor purposes of inspections by the Building Division. Other Permits. Multiple separate permits may be required:(1)State Electrical Permit, (2) County OWTS Permit, (3) another permit required for use on the property identified above, e.g. State or County Highway/ Road Access or a State Wastewater Discharge Permit. VoidPermit. ABuildingPermitbecomesnull andvoidiftheworkauthorizedisnotcommencedwithinlS0daysof the date of issuance and if work is suspended or abandoned for a period of 180 days after commencement. CERTIFICATION I hereby certify that I have read this Application and that the information contained above is true and correct. I understand that the Building Division accepts the Application, along with the plans and specifications and other data submitted by me or on my behalf (submittals), based upon my certification as to accuracy. Assuming completeness of the submittals and approval of this Application, a Building Permit will be issued granting permission to me, as Owner, to construct the structure(s) and facilities detailed on the submittals reviewed by the Building Division. ln consideration of the issuance of the Building Permit, I agree that I and my agents will comply with provisions of any federal, state or local law regulating the work and the Garfield County Building Code, OWTS regulations and applicable land use regulations (County Regulation(s)). I acknowledge that the Building Permit may be suspended or revoked, upon notice from the County, if the location, construction or use of the structure(s) and fac¡lity(ies), described above, are not in compliance with County Regulation(s) or any other applicable law. lherebygrantpermissiontotheBuildingDivisiontoentertheproperty,describedabove,toinspectthework. I further acknowledge that the issuance of the Building Permit does not prevent the Building Official from: (1) requiring the correction of errors in the submittals, if any, discovered after ¡ssuance; or (2) stopping construction or use of the structure(s) or facility(ies) if such is in violation of County Regulation(s) or any other applicable law. Review of this Application, including submittals, and inspections of the work by the Building Division do not constitute an acceptance of responsibility or liability by the County of errors, omissions or discrepancies. As the Owner, I acknowledge that responsibility for compliance with federal, state and local laws and County Regulations rest with me and my authorized agents, including without limitation my architect designer, engineer and/ or builder. I hereby acknowledge that I have read and understand the Notice and Certification above as well as have provided the required information wh¡ch is correct and accurate to the best of my knowledge. Chad Campbel I B:1[:i,;5äË13',îF1,.."-äå,åål' 91612022 Property Owner Print and Sign Date OFF'C'AL USE ONL' pAlD. Sr+æ.oo C.C. o\(t_t /zozz.fu Special Conditions:''îù-'¿,;*D tfrø.¡j lVln r^ 5i¿'.tg Âr{f<5py /.ñrÞ (o,ux.'rn'-i¡c¡y Þ€Vr=¿-o'?.¡ .¿>rf ^4€, -6 Fee:Misc Fees:Total Fees: 00.0t' Balance due:Grading Perm¡t: .$6RaD _7t2L !$ue-Qe!e: Fees Paid:f 1oÞ,oo Zoning: ß. r, tô -3t- ZLBUILDING / PLANNING DIVISION : Date $400.00 10/31/2022 NO. Control Measure ID Unit Installation Unit Cost Quanitity Cost 1 Check Dam CD LF 24.00$ -$ 2 Compost Blanket CB SF 0.36$ -$ 3 Compost Filter Berm CFB LF 2.00$ -$ 4 Concrete Washout Area CWA EA 100.00$ -$ 5 Construction Fence CF LF 2.00$ -$ 6 Construction Markers CM LF 0.20$ -$ 7 Dewatering DW EA 600.00$ -$ 8 Diversion Ditch DD LF 1.60$ -$ 9 Erosion Control Blanket ECB SY 5.00$ -$ 10 Inlet Protection IP LF 20.00$ -$ 11 Reinforced Check Dam RCD LF 36.00$ -$ 12 Reinforced Rock Berm RRB LF 9.00$ -$ 13 RRB for Culvert Protection RRC LF 9.00$ -$ 14 Sediment Basin SB AC 1,100.00$ -$ 15 Sediment Control Log SCL LF 2.00$ -$ 16 Sediment Trap ST EA 600.00$ -$ 17 Seeding and Mulching SM AC 2,500.00$ -$ 18 Silt Fence SF LF 2.00$ -$ 19 Stabilized Staging Area SSA SY 2.00$ -$ 20 Surface Roughening SR AC 600.00$ -$ 21 Temporary Road Crossing TRC EA 3,000.00$ -$ 22 Temporary Slope Drain TSD LF 30.00$ -$ 23 Temporary Stream Crossing TSC EA 1,000.00$ -$ 24 Terracing TER N/A $ 25 Vehicle Tracking Control VTC EA 1,000.00$ -$ 26 VTC with Wheel Wash WW N/A $ 27 Temporary Batch Plant Restoration AC 5,000.00$ -$ 28 A Lot Controls A EA 750.00$ -$ 29 B Lot Controls B EA 1,000.00$ -$ -$ -$ -$ Total Surety Amount -$ Town of Castle Rock - TESC Permit Cost Opinion Spreadsheet Project No.: Project Name: (Grand Total x 1.15) Total Costs 10% Contingency Grand Total Rev 12-2021 NA Xcel 6670 Tline Rebuild Waterbar WB EA $ 400.00 2 NA NA NA NA NA 200.00 NA NA NA NA NA NA NA NA NA NA NA 3 NA NA NA NA NA 27.00 NA NA 7,000 14,000.00 NA NA 13 32,500.00 NA NA NA NA 13 7,800.00 NA NA 2 800.00 - 12 12,000.00 NA NA NA NA NA NA NA NA NA NA 3 3,000.00 70,327.00 7,032.70 77,359.70 63,330.96 Cost Estimate Spreadsheet 1 Memo Date: Saturday, June 04, 2022 Project: 6670 De Beque Substation to UNA Substation Electric Transmission Line Rebuild To: Mesa County and Garfield County, Colorado From: Brian Brown – HDR Subject: Decommissioning/Reclamation Plan Public Service Company of Colorado (PSCo), a Colorado corporation doing business as Xcel Energy, must replace the existing transmission line between the De Beque to UNA Substations. This line generally crosses rural undeveloped land. The new structures will be within the existing transmission easement and accessed via existing private or public roads and existing and new access routes. The intent of this Plan is layout Xcel’s approach to line decommissioning and reclamation of disturbed areas. Note: Public Service Company of Colorado (PSCo) is a subsidiary of Xcel Energy (Xcel). PSCo and Xcel in this memo refer to the same company and may be used interchangeably. Line Decommissioning Decommissioning of the line involves disconnecting the lines (overhead lines between poles) and removal of above ground structures to support the lines including guy wires and the wood pole structure. This process is typically as follows: • Erosion control measures per the Stormwater Management Plan (SWMP) permit will be implemented prior to construction activity. • Once the line is deenergized, overhead lines are disconnected via a bucket truck. • These lines will be removed during the decommissioning phase but the actual sequencing of such varies based on other factors that will be determined at the time of removal. • Cross arms may be removed once the lines are disconnected or once the pole is laid on the ground. • The soil at the base of the pole will be hand excavated approximately 1 foot deep with the excavated soil sitting immediately adjacent the excavation. • The grounding wire at the base of the pole will be removed. • Guy wires will be disconnected from the guy wire anchors. The below grade anchors will be abandoned in place. • The bucket truck will secure the pole to the elevated bucket. • The pole will be cut roughly 8 inches below the surrounding ground surface and placed horizontally on the ground or onto a truck in a controlled manner to be removed from the site. • The soil excavated from around the pole will be replaced into the excavation and over the void left by the pole removal. The base of the pole below grade will remain in place covered with soil. 2 • SWMP maintenance and inspections will continue during construction in all on-going and post- construction areas until permit closure. Staging Area Staging area impacts for this project area expected to be minimal. Staging areas in this flat area typically follow the same sequence of impacts and restoration: • Erosion control measures per the SWMP are implemented in compliance with permit conditions. This typically includes installation of a vehicle tracking control (VTC) which may be the only excavation disturbance associated with this construction. • Security fencing, if deemed necessary, will be installed. • Equipment, material, Conex, and trailer deliveries will begin. • The staging yard(s) will continue to be utilized as a place of material storage, staging, and assembly as well as a location for workers to park personal vehicles to minimize vehicle traffic along the Xcel ROW and crossing private property. • Typically, on flat staging yards, expected on this project, no further excavation is required. • After construction, remaining material, equipment, trailers, Conex, and fencing will be removed from the site. • Soil decompaction may be performed based on the agreement with t he landowner. • Seed and mulch, unless agricultural crop land, will be placed per the conditions of the SWMP permit • SWMP inspections, maintenance, will continue until the site vegetation has been restored, SWMP maintenance and inspections will continue during construction in all on-going and post-construction areas until permit closure, excepting disturbed areas that will be utilized for crop production the following growing season. Reclamation While there are multiple construction types for this project, i.e. temporary pad grading, access grading, structure base excavation, etc., they are all fairly similar. Note: as this project is crossing mostly flat ground, therefore pad or access grading is expected to be isolated and very limited. Below is the general sequential approach to minimize disturbance and promote revegetation across the project. This will have to be slightly customized to each construction type and site conditions. 1. Prior to the start of construction, a surveyor will stake pole locations, off-sets, temporary construction areas, and other locations of importance where field delineation is beneficial. 2. Appropriate PSCo staff, line construction contractor, foundation contractor, earthwork contractor, and erosion control contractor will meet on-site to review the delineated construction impact limits. 3. Flagging or paint used to delineate where perimeter erosion control measures should be placed based on disturbance limits defined by PSCo construction team (item 2 above). 4. PSCo erosion control plan developer, PSCo Environmental Analysist, or erosion control install contractor may collect multiple representative topsoil soil samples for analysis along the transmission line. This analysis would focus on the potential for possible soil amendments (primarily nitrogen, phosphorus, and potassium) during seeding. 3 – 6 samples are expected based on the varying soil conditions along the line. 3 5. Erosion control contractor team will install perimeter erosion control measures, typically construction fence, boundary fence, sediment control logs, rock logs, and vehicle tracking control per the requirements identified in the State Stormwater Management Plan (SWMP). 6. Only as necessary for project, trim and remove vegetation for off-site disposal that will directly impact site grading or access. PSCo to utilize trimming as much as practicable to keep root structure in place. 7. In areas where grading is required, strip topsoil (assume top 4 inches of soil) for reuse on site. Topsoil to be segregated from other material. Topsoil to be placed along access or in other areas adjacent grading. Topsoil may be transported from immediate work area due to space constraints. Topsoil that is stockpiled for more than 14 days will be seeded for temporary stabilization. Topsoil stockpiles that are to remain dormant for more than 14 days are to have side slopes no steeper than 1H:1V. 8. Topsoil stockpiles may be placed on undisturbed adjacent ground. In this event, PSCo will place a separation fabric, i.e. Mirafi 140N or like, to provide a physical indicator as to where the stockpile ends and native ground begins. PSCo has had success with this approach as it reduces unwanted disturbance of native ground and allows an undisturbed but lightly ‘compressed’ topsoil layer to bounce back once topsoil and separation fabric is removed. 9. Once permanent cut slopes are graded, they will be covered in topsoil within 14 days and seeded and mulched within another 14 days. This will allow permanent cut/fill face revegetation to commence as soon as possible. Work areas where active construction is anticipated, i.e. flat pads, are not to be topsoil covered until heavy construction work has ceased. Once heavy construction of permanent pads has ceased, topsoil cover is to be completed within 14 days and seeding and mulching to follow within another 14 days. 10. Subgrade excavation material, from grading or structure excavation, will be spread on the access road, exported from the site for off-site disposal, or stockpiled in immediate or near-by work area for future use, particularly in areas with temporary grading impacts that are to have grades restored. Like the topsoil above, subsoil that is stockpiled on undisturbed ground is to have a separation fabric below the stockpile to clearly distinguish between native grade and stockpile material. This will minimize disturbance of the native grade and allow this compressed native grade to bounce back once stockpile and separation fabric is removed. 11. Once construction is completed at a site for permanent grading impacts, i.e. conductor pull/tensioning pads and access roads, the site soil is to be ripped to loosen the subgrade due to soil compaction during construction. Following decompaction, topsoil is to be placed at a depth of 4 inches in a loose manner ready to accept seed. Unlike most topsoil requirements, rock of various gravel sizes less than 6 inches diameter may remain in the topsoil layer. 12. Once construction is completed at a site for temporary grading impacts, the site rough grades are to be reestablished and the subgrade soil is to be bucket compacted to a ‘firm’ condition. Following compaction, topsoil is to be placed at a depth of 4 inches in a smooth but loose manner ready to accept seed. Unlike most topsoil requirements, rock of various gravel sizes less than 6 inches diameter is expected in the topsoil layer and is indicative of native topsoil in this area. 13. Soil amendments are to be added per soil analytic recommendations via mechanical broadcast or hydraulic application. Site seed mix is to be spread at appropriate rates given application type, hydraulic, drill, or hand broadcast. The amendment and seed application will vary substantially based on disturbance type site access and soil conditions. In cases of hydraulic application, the seed mix may be applied with the liquid amendment or hand broadcast but in no case is seed to be mixed and applied with mulch. 4 14. Final erosion control cover for seeded areas will vary based on access to disturbance areas. Truck or tracked access areas will have either straw crimp mulch (on grades less than 10 percent and low rock content soil) or a high quality hydraulically applied mulch, i.e. Flexterra HP-FGM or like, on grades exceeding 10 percent. PSCo generally does not support using erosion control blankets on this project due to concerns about reduced blanket to soil contact and due to longer life blankets having a high synthetic content with leads to a wildlife entrapment hazard. 15. PSCo will change erosion control inspection schedule from weekly to monthly inspections once initial stabilization measures (seeding and mulching) have been completed. If there are areas of concern identified during the monthly inspection that need to be addressed (i.e. erosion or lack of revegetation growth), the revegetation contractor will return to the site to address identified issues. 16. Per the required State (SWMP) and local (Grading Permits), PSCo will continue to maintain structural erosion control measures across the project until no longer necessary. These will primarily include down-gradient sediment control logs but may include other control measures. These measures will be removed when no longer required and seed will be hand broadcast in areas where removal has exposed or disturbed less vegetated soil. 17. Once site has met plant density cover requirements, PSCo will perform a final post-construction site visit to document final conditions and then PSCo will close SWMP permit with the State. NOTES: • PSCo’s ability to stabilize disturbed areas with vegetation is dependent on many factors within PSCo control. Unfortunately, favorable moisture conditions for germination and continued growth are beyond PSCo control and a key determinate for revegetation. PSCo anticipates adequate revegetation will take multiple years. PSCo frequently returns to sites multiple times that are in the vegetation growth phase to address areas of erosion and reseed and/or mulch as necessary to promote vegetation stabilization. • PSCo hires a separate third-party company to perform the erosion control installation, maintenance, and revegetation as well as another third-party company to perform regular erosion control inspections. These companies have long standing relationships with PSCo. With this approach, PSCo has trained the installation company and inspection company to meet PSCo’s standards and to stay in compliance with state and local permit conditions which improve the restoration trajectory. Xcel’s practice is to continue inspection and maintenance, both performed by third party contractors, until site revegetation is established. Access for the post construction inspection and maintenance will be over prescriptive rights, landowner allowed access, and the transmission line easement. Seed Mix: A seed mix is proposed in the Noxious Weed Mitigation Plan and will be reviewed during construction in consultation with suppliers and appropriate County representatives, if requested. Noxious Weed Management Plan 6670 DEBEQUE TO UTE-RIFLE TRANSMISSION LINE REBUILD Mesa County, Colorado June 2022 _______________________________________________________ Prepared for: Xcel Energy PO BOX 840 Denver, Colorado 80201 (720) 963-3684 _______________________________________________________ Prepared by: HDR, Inc 1670 Broadway, Suite 3400 Denver, CO 80202 _______________________________________________________ Noxious Weed Management Plan | 6670 DEBE - UTER Transmission Line Rebuild TOC-i Contents Page No. Section 1. Introduction .................................................................................................................... 1 Section 2. Noxious Weed Management Requirements .................................................................. 1 2.1 Presidential Executive Order 13112—Invasive Species ....................................................... 1 2.2 Colorado Noxious Weed Act ................................................................................................. 1 2.3 Mesa County Noxious Weed Management ........................................................................... 2 Section 3. Noxious Weed Control – Pre-construction ..................................................................... 2 Section 4. Noxious Weed Control – During-Construction ............................................................... 3 Section 5. Noxious Weed Control – Post-Construction .................................................................. 3 5.1 Seed mix ................................................................................................................................ 7 Section 6. Recommended Management and Mitigation Actions .................................................... 8 Section 7. References ..................................................................................................................... 9 Tables Table 1. Noxious Weed Species Recommended Control Techniques .................................. 5 Table 2. Semi-Desert Loam Revegetation Seed Mixture*...................................................... 7 June 2022 Page 1 Section 1. Introduct ion The Public Service Company of Colorado (PSCo), a Colorado corporation of Xcel Energy (Xcel), is proposing to rebuild the De Beque (DEBE)– Ute Rifle (UTER) overhead transmission line primarily in unincorporated eastern Mesa County and western Garfield County, Colorado. This Noxious Weed Plan is based on typical practices and not on a site weed survey. This Noxious Weed Management Plan (Plan) has been prepared to support the expected noxious weed management activities for such a project in the Mesa County area. Section 2. Noxious Weed Management Requirements When present in large numbers, noxious plant species have had considerable impacts to the quality and integrity of natural ecosystems. Noxious weed species can alter fire ecology, successional ecosystem processes, and ecosystem function of the ecosystems they invade. Some species have had such serious economic and biological impacts that their control and management is mandated under Colorado State law (i.e., List A species). Because of the adverse environmental effects of noxious weeds, federal and state governments have issued various orders and regulations regarding noxious weeds. The following are some of the regulations guiding noxious weed management. 2.1 Presidential Executive Order 13112 —Invasive S pecies Executive Order 13112, Invasive Species, was issued on February 3, 1999, to prevent the introduction of invasive species; provide for their control; and minimize the economic, ecological, and human health impacts that result from invasive species. This order directs federal agencies to prevent the introduction of invasive species, control and monitor invasive species, and restore native species and habitats that have been invaded (Federal Register 1999). 2.2 Colorado Noxious Weed Act As defined by the Colorado Department of Agriculture (CDOA), noxious weeds are plants that reduce agricultural productivity, lower real estate values, endanger human health and well-being, and damage scenic values (CDOA 2021a). The Colorado Noxious Weed Act §§ 35-5.5-101 through 119, C.R.S. as amended, states that an organized and coordinated effort must be made to stop the spread of noxious weeds. Rules pertaining to administration of the Act include a noxious weed list that designates and classifies noxious weed species into categories for immediate eradication (CDOA 2021a): • List A contains 25 species of noxious weeds targeted for eradication. If individuals or populations of A List species are found, the local governing body must provide the State Weed Coordinator with mapping that includes information on location and density of the infestation. • List B contains 38 species that are targeted for eradication, containment, or suppression based upon a given local governing body’s management plan. June 2022 Page 2 • List C contains 16 species for which the Commissioner of Agriculture, in consultation with the state noxious weed advisory committee, local governments, and other interested parties, will develop and implement into state noxious weed management plans designed to support the efforts of local governing bodies to facilitate more effective integrated weed management on private and public lands. In addition to the three lists, the state maintains a noxious weed species “Watch List”. It contains 19 species that CDOA has determined pose a potential threat to the agricultural productivity and environmental values of the lands of Colorado. It is for advisory and education purposes only and is intended to encourage the collection of information needed to determine if the species should be listed as a noxious weed. 2.3 Mesa County Noxious Weed Management Mesa County adopted a Noxious Weed Management Plan, revised in April 2020 , to meet the Goals & Objectives listed in section 2.0. The Mesa County Noxious Weed List includes 29 weeds as of 2017 (Table 1). The plan varies slightly from the State List B species between the County list and the State list. The County has a Weed Advisory Board to support the County in yearly determinations regarding weed list changes. The County ’s principles of weed management are incorporated into the pre- and post-construction weed management activities, as appropriate. These include: • Prevention • Cultural Practices • Physical/mechanical methods • Biological Control • Chemical Control The term “noxious weed” includes species listed as noxious by the Colorado Department of Agriculture (CDOA 2021a) and additional plants listed as weeds within the County . Plant nomenclature for noxious weeds in this report follow the CDOA website . Section 3. Noxious Weed Control – Pre -construction Prior to construction, Xcel will utilize the following steps to minimize noxious weed propagation: • Training of crews as to how surface disturbance creates a more favorable environment for noxious weeds if seed stock s in the area, • Delineating areas with boundary fence, see SWMP Plans and report, or a similar physical barrier to limit unnecessary surface disturbance, • Cleaning of equipment to avoid bringing non -native soil or vegetation onto the site as these may contain unwanted seed stock. Equipment brought to the site must be free o f clean of soil or vegetation from another site. Thorough power washing of wheels, tracks, undercarriage, and excavation equipment will be performed prior to site arrival. Equipment that leaves the site, i.e. for crew transportation or equipment repair, and then returns to the site without leaving pavement does not need to be rewashed. June 2022 Page 3 • A State Stormwater Management Plan (SWMP) permit that covers this construction activity will be obtained by Xcel and the weed management steps will work in conjunction with the SWMP. Section 4. Noxious Weed Control – During - Construction Construction activities will expose soils in areas that have been previously disturbed and limited areas that have not been previously disturbed. This disturbance creates a potential for the introduction and spread of noxious weeds in the project area. Noxious weed species that occur in and adjacent to disturbed areas of the project have the potential to spread into areas impacted by placement of new structures, use and construction of access roads for construction equipment and use of staging areas. The goal of the plan is to minimize the spread of noxious weeds due to the proposed project’s construction activities. By implementing measures intended to minimize the spread of noxious weeds during construction and minimizing the establishment of new noxious weed populations post construction, the proposed project should minimize new and help reduce existing noxious weed infestations. The activities during construction will, at a minimum, include: • Removal and stockpiling of topsoil for replacement in immediate area of excavation disturbance as this will create a more favorable soil strata for revegetation. • Leaving ‘drive & crush’ areas alone to rebound naturally. This assume the topsoil layer and associated root structure remains in place but has only been compressed by construction activity. • Crews continue to be diligent about minimizing the construction impact to avoid topsoil disturbance. • Hand or drill seeding of appropriate seed mix has been applied along with mulch. • The SWMP permit compliance will continue during construction and the weed management steps will work in conjunction with the SWMP. Section 5. Noxious Weed Control – Post -Construction Post construction activities are based on the assumption that the site grades and topsoil have been restored and appropriate seed mix has been applied. Post-construction weed control activities will commence in the year following completion of construction as that is when weed seed germination and growth is more apparent. NOTE: Weed control will only be addressed in areas disturbed by construction and will not address weed infestations outside of the disturbance area even if they are within Xcel’s ROW. Post-construction weed management priorities are based on th e threat noxious weed species found in the project area pose to the overall goal of maintaining the health of the ecosystem. Generally, List A species are the highest priority because they are often the most aggressive species with limited distribution. Myrtle spurge is the only species documented that is designated as a “List A” species in the Colorado Noxious Weed Act. It is designated for statewide eradication. List B are next priority species and List C species are generally widespread and are not prioritized. June 2022 Page 4 The best technique for controlling most noxious weeds is an integrated approach of mechanical, biological, and chemical controls. Mechanical control usually involves mowing, hand -pulling, or cutting. Biological control is the use of organisms (usually insects, but also livestock) that are deliberately introduced to an area to control weeds. Chemical control involves the application of one or more herbicides at the appropriate time of the year (all herbicides should be applied by a certified applicator according to the manufacturer’s directions). Where chemical controls are recommended, Xcel and its contractors work to minimize the use of chemicals that are harmful to beneficial insects in their vegetation management practices controlling shrubs, trees, and weed species within their rights-of-way and properties. This includes eliminating the use of neonicotinoids, a class of neuro-active insecticides, which have been found harmful to all invertebrate populations including bee populations and other nati ve pollinators (Xcel Energy Undated). The year following construction, two noxious weed treatments will be undertaken : 1. Early season (May-June) for cool-season noxious weeds (e.g., redstem fillaree, cheatgrass, bindweed), 2. Late season (July-August) for the warm-season noxious weeds (e.g., thistles and knapweeds). Areas of infestations identified in these surveys will determine appropriate treatment and suppression methods. Noxious Weed Treatment Measures Xcel’s noxious weed management contractor will implement noxious weed control measures in accordance with existing regulations and local requirements. Post-construction control measures can include one or more of the following methods (that may be implemented during restoration activities): • Treatment methods will be based on species-specific and area-specific conditions (e.g., proximity to water or riparian areas, agricultural areas, and time of year) with the County coordinator being notified prior to noxious weed eradication activities . If areas are not seeded until the following spring, Xcel will alter weed treatment timing based on weed control best practices. • Mechanical methods rely on equipment that can be used to mow or disc weed populations. If such a method is used in areas to be restored, sub sequent seeding will be conducted to re-establish a desirable vegetative cover that will stabilize the soils and slow the potential re-invasion of noxious weeds. • Discing or other mechanical treatments, that would disturb the soil surface within native habitats, will be avoided in favor of an herbicide application, which is an effective means of reducing the size of noxious weed populations as well as preventing the establishment of new colonies. • Seed selection will be based on site-specific conditions and the appropriate seed mix June 2022 Page 5 identified for those conditions, as presented in Table 2. • Herbicide applications will be controlled to minimize the impacts on the surrounding vegetation. In areas of dense infestation, a broader application will be used and a follow - up seeding program may be implemented. Table presents typical species-specific recommended control measures which may be implemented. NOTE: Table 2 is typical of approaches for weed management. Actual methods will depend on weed species encountered. These recommended control measures are from the Colorado Department of Agriculture website (CDOA 2021a). Some of the noxious weed species are widespread and not found in defined populations, therefore treatment will be difficult and may not be prioritized. Treatment will only occur in areas where soil disturbance due to construction occurred. Table 1. Noxious Weed Species Recommended Control Techniques Common Name Chemical Mechanical Biological Russian knapweed Aminopyralid (Milestone), Aminocyclopyrachlor + Chlorsulfuron (Perspective). Most effective if applied in the fall when above- ground stems die back. Cutting or mowing can stress plant and force it to use reserves. Tilling and disking can create root fragments that can sprout. However, repeated deep tillage (1 feet) over 3 years can kill much of the root system. The gall midge, Jaapiella ivannikovi, is a fly that lays eggs in the shoot tips of Russian knapweed. It forms galls that reduce flowering, seed production, and stunts the plants’ growth. This biocontrol will stress the stand of Russian knapweed but will not likely eliminate it. Not available to public. Downy brome (cheatgrass) Pseudomonas fluorescens D7 inhibits cheatgrass and is currently approved by EPA and Colorado. Mechanical methods are best for residential areas and small infestations. Collect, bag, and dispose of or destroy flowers; seeds can mature and germinate if left. Tilling must be deeper than 6 inches to work. Prescribed fire applied before seed maturity, (late spring or early summer), may kill seeds; the trick is to get green cheatgrass and litter to carry fire and at a hot enough temperature to destroy seeds and seedlings. No approved biological control agents. Musk thistle Aminopyralid (Milestone), Chlorsulfuron (Telar), and Clopyralid (Transline). Apply in spring from rosette through very early flower growth stages. Methods, such as tilling, hoeing and digging, are best for infestations smaller than 0.5 acres. Sever roots below the soil surface during the first year before the plant stores energy, and in the second year before flower production. Mowing, chopping and deadheading stimulates more Trichosirocalus horridus is the only biological control agent available for musk thistle in Colorado. June 2022 Page 6 flower production; these methods require consecutive years of season-long treatments. All flower buds and heads must be collected, bagged, and disposed of or destroyed. Prescribed fire that results in high soil burn severity damages roots and above ground biomass, but is not recommended due to impacts on desired plants. Chinese clematis 2, 4-D amine, Imazapic (Plateau, Panoramic), and Aminopyralid (Milestone). 2, 4-D amine applied anytime actively growing. Other herbicides applied in fall. Digging or hand pulling is effective when soil is moist. Make certain to pull all the roots and bag specimens carefully so as to not scatter seeds if flowering. No approved biological control agents. Field bindweed Clarity + 2,4-D Amine, Tordon 22K *this is a Restricted Use Pesticide, and Roundup Ultra *non- selective herbicide, will kill all vegetation* See Application timing on Noxious Weed Fact Sheets. Cutting, mowing, or pulling has a negligible effect unless the plants are cut below the surface in the early seedling stage. The bindweed gall mite, Aceria mahlerbae, has proven to be effective in reducing field bindweed infestations. Russian olive Triclopyr and imazapyr are the most effective herbicides. Both should be applied to the cambial layer of the tree immediately after cutting (cut-stump treatment). Mowing or cutting can be effective, but often must be combined with either herbicides or excavation of the entire stump. Burning can be effective if conditions can support a long, hot fire. Tubercularia canker can be effective. Redstem filaree Metsulfuron (Escort XP) or 2,4-D + dicamba (Rangestar). Apply at rosette stage of growth. Hand pulling or digging when soil is moist, making sure to get the roots to prevent resprouting is effective. Removing flowers before the plant sets seed will also be effective. No approved biological control agents. Myrtle spurge 2, 4-D ester, Dicambra + 2, 4-D, and Picloram + 2, 4-D. Spot treat isolated populations with a backpack application (Steve Anthony, Garfield County Vegetation Manager, personal communication, January 24, 2022). Hand pull or dig when soil is moist. Make certain to pull all the roots and wear rubber gloves and eye protection to protect yourself from the toxic milky sap. Treatment follow up is important to check root fragment resprouts that will occur when the tap root is severed too shallow. Biocontrol is not an approved method of control for State List A species. Halogeton Metsulfuron + Chlorsulfuron (Cimmaron X-tra) or Chlorsulfuron (Telar XP). Apply pre- emergence to post- emergence stages Hand pull or dig when soil is moist, but make sure to wear gloves. Bag specimens carefully so as not to scatter seeds. The key to effective control is to prevent seed production and/or spread. No approved biological control agents. June 2022 Page 7 in spring. Dalmatian toadflax Aminocycophrachlor + Chlorsulfuron (Perspective), Picloram (restricted use), and Chlorsulfuron (Telar). For small infestations, pulling toadflax by hand can be effective. Pull every year for 5 to 6 years to deplete the reserves of the root system. Monitor the site for 10 - 15 years to remove seedlings produced from dormant seeds. Calophasia lunula, a predatory noctuid moth, feeds on leaves and flowers of Dalmatian toadflax. Eteobalea intermediella, a root boring moth, and Mecinus janthinus, a stem boring weevil, are also available. Scotch thistle Aminopyralid* (Milestone), Chlorsulfuron (Telar), Metsulfuron + Chlorsulfuron (Cimarron X-tra), Clopyralid (Transline) Aminocyclopyrachlor + chlorsulfuron (Perspective). Apply in spring rosette to early bolting growth stages. Two treatments in growing season required (Steve Anthony, Garfield County Vegetation Manager, personal communication, January 24, 2022). Methods, such as tilling, hoeing and digging, are best for infestations smaller than 0.5 acres. Sever roots below the soil surface during the first year before the plant stores energy and in the second year before seed production. Mowing, chopping and deadheading stimulates more flower production; these methods require consecutive years of season-long treatments. Flower heads must be collected, bagged, and disposed of or destroyed; seeds will mature and germinate if left on the ground. No approved biological control agents. Siberian elm No control methods available since this is a Watchlist species. N/A N/A Source: Colorado Department of Agriculture (2021a). Table 2 - Control Techniques based on recommendation form Garfield County Weed Control Manager, Steve Anthony following the CDOA-published control techniques for noxious weeds. 5.1 Seed mix Restoration will consist of re-contouring the disturbed areas around structures and staging areas per grading plans and reseeding the area with the following seed mix. The timing of subsequent seeding efforts will be based on the life of applied herbicides, if used. NOTE: This seed mix will be reviewed during construction and in consultation with supplier and appropriate County representative. Table 2. Semi-Desert Loam Revegetation Seed Mixture* Species Pounds per Acre** Number of Seeds*** Western wheatgrass (Pascopyrum smithii) 3.00 8 Indian ricegrass (Achnatherum hymenoides) 2.00 6 June 2022 Page 8 Prairie junegrass (Koeleria macrantha) 0.50 26 Sandberg bluegrass (Poa secunda ssp. Sandbergii) 1.00 24 Galleta grass (Pleuraphis jamesii) 2.00 7 Bluebunch wheatgrass (Pseudoroegneria spicata ssp. Spicata) 2.00 6 Bottlebrush squirreltail (Elymus elymoides) 2.00 9 Total 12.50 85 *The seed mix shown in Table was developed by Granite Seed and Erosion Control based on existing native grasses that occur in this region. Seed mix may be obtained from other suppliers. ** Pure Live Seed ***Per Square Foot Section 6. Recommended Management and Mitigation Actions In addition to the specific management recommendations listed for each species in Table , the following mitigation measures are recommended (as appropriate) to minimize the spread of noxious weeds: • All construction equipment will remain in designated work areas. • The area of ground disturbance will be kept to the minimum necessary. • Minimize imported topsoil during construction. If importing is necessary, use certified weed-free soil. • All equipment will be thoroughly cleaned before entering and exiting the study area. • All mulches and straw used at the site will be certified weed-free. • All disturbed areas will be seeded after construction. Seeding will consist of species listed in Table . Semi-Desert Loam Seed Mixture will be spread on disturbed ground around structures and staging areas, as appropriate. The seed mix will be reviewed after the weed survey and in consultation suppliers and appropriate County representatives, as requested. • All seed mixes, soil, and other plant material used for revegetation will be free of noxious weed seeds, roots, and other propagules. • Only a Colorado-licensed Supervisor or Certified Operator will apply herbicides. • All herbicides will be applied in accordance with the manufacturer’s instructions. • Broadcast herbicide spraying will be limited to areas of project ground disturbance, around each existing and new structure, and at staging areas. Weed treatment around each existing and new structure will be limited to disturbance associated with this line rebuild. • The Mesa County Vegetation Manager will be notified prior to noxious weed treatments, as appropriate to the disturbance jurisdiction. • Applicable best management practices (BMPs) from the Stormwater Management Plan will be implemented. June 2022 Page 9 Section 7. References Colorado Department of Agriculture (CDOA). 2021a. Noxious Weeds. Available online: <https://www.colorado.gov/pacific/agconservation/noxiousweeds> and <https://drive.google.com/file/d/0Bxn6NtpJWc9JRFE3LW1RWFVXY1E/view?resourcekey= 0-WalETB5Qp3zCjfRnar5t3g>. Accessed October 2021. CDOA. 2021b. County Weed Programs. Available online: County Weed Programs | Department of Agriculture (colorado.gov)>. Accessed October 2021. Colorado Department of Transportation (CDOT). 2021. Noxious Weeds Map. Available online: < https://cdot.maps.arcgis.com/home/webmap/viewer.html?webmap=ebd39c7a542349c6914 89f5ecb1a1c62#!>. Accessed October 2021. Colorado Natural Heritage Program (CNHP). 2016. Survey of Critical Biological Resources: a resurvey and update of Potential Conservation Areas in Garfield County, Colorado. Available online: https://cnhp.colostate.edu/wp- content/uploads/download/documents/2016/Final_Garfield_2016_report.pdf. Accessed October 2021. Mesa County Noxious Weed Management Plan, Revised April, 2020 https://www.mesacounty.us/globalassets/weed-and-pest-district/plans/mesa -county- noxious-weed-plan.pdfUNTY U.S. Department of Agriculture (USDA). 2006. Land Resource Regions and Major Land Resource Areas of the United States, the Caribbean, and the Pacific Basin. Natural Resources Conservation Service, USDA Handbook 296. U.S. Geological Survey (USGS). 2021. National Land Cover Database (NLC D). Available online: https://apps.nationalmap.gov/viewer/. Accessed June 2021. Western Regional Climate Center. 2021. Climate Summaries. Available online: https://wrcc.dri.edu/Climate/summaries.php. Accessed October 2021 . Xcel Energy. Undated. Wildlife and Habitat Protection. Available online: <https://www.xcelenergy.com/staticfiles/xe- responsive/Company/Corporate%20Responsibility%20Report/2019%20CRR/2019_Wildlife %20and%20Habitat%20Protection_CRR.pdf>. Accessed October 20 22 (Applicant’s Copy) Community Development Department 108 8th Street, Suite 401 Glenwood Springs, CO 81601 (970) 945-8212 www.garfield-county.com GRADING PERMIT APPLICATION CHECKLIST GRADING PERMIT REQUIREMENTS A permit is required for any excavation, grading, or earthwork construction including fills and embankments. A grading permit does not permit the construction of retaining walls or other structures. EXEMPTION FROM GRADING PERMIT:  Agricultural Land: Grading, excavation and earthwork, including fills and embankments that are constructed solely for agricultural purposes on lands that are farms or ranches.  Small Projects: Grading that does not exceed 50 cu. yds of earthwork material or 6000 sq.ft. of graded area as long as grading does not change drainage patterns with respect to adjacent properties.  See Amended IBC Appendix J for other exemptions. TYPES OF GRADING PERMITS AND FEES: Payment is due at time of submittal. Make Check payable to: Garfield County Treasurer  Major grading: over 20,000 sq. ft. or over 5000 cubic yards……………………..$400.00  Minor grading: less than 20,000 sq. ft. and under 5000 cubic yards...……….…$100.00 PERMIT APPLICATION & SUBMITTAL REQUIREMENTS (1 copy required):  Complete application (a one page form is available from the County)  Vicinity Map indicating section, township and range of site, proposed location of grading, and the site’s relation to surrounding roads, municipal boundaries, and water bodies.  Site plan that shows the following within 100 feet of the proposed grading: i. Existing and proposed contours (see exemption below for pipelines) ii. Delineation of area to be disturbed by grading activities iii. Existing structures iv. Existing and proposed roads and driveway v. Property boundaries, right-of-ways and easements vi. Floodplains, intermittent streams, wetlands and other bodies of water  Erosion Control Plan and Details. Plan shows the location of all erosion control measures.  MAJOR GRADING PERMIT ONLY: i. Revegetation and Reclamation Plan. See attached requirements. ii. Financial security for site reclamation. Please allow County to review reclamation cost estimate before providing security. iii. For major grading permits, the plans must be prepared and stamped by a qualified Colorado Professional engineer.  PIPELINES ONLY: The site plan does not need to show topographic contours if the installation of pipeline will not result in changes to the surface grade.  Approved State Stormwater Permit if area disturbed by grading is greater than one acre.  Soils Report: A soils report may not be required if the maximum depth of cut or fill depth is less than 15 feet and native slopes are less than 25%.  Drainage Report: will be required if the County believes that grading may change drainage patterns with regard to adjacent properties, wetlands/water bodies or slopes greater than 25% (Applicant’s Copy) ALL PERMITS MUST COMPLY WITH THE FOLLOWING REQUIREMENTS:  Appendix J- International Building Code as amended.  Garfield County Land Use Code.  Applicable Colorado Department of Public Health and Environment, Water Quality Control Division requirements.  UTILITY LOCTION IS REQUIRED PRIOR TO ANY GRADING. Garfield County Vegetation & Site Reclamation Requirements (Long-Term Disturbed Areas, One Acre or More) Overview: Grading Permits typically require the submission of:  A Site Specific Inventory and Map of county and State Listed Noxious Weeds.  A Weed Management Plan.  A Revegetation and Reclamation Plan.  A Cost Estimate  A Financial Security. The purpose of the plan is to ensure that the development does not result in: (i) erosion and dust generation, (ii) the propagation of noxious weeds, (iii) the excessive loss of wildlife habitat and food sources, and (iv) long-term visual eyesores. The financial security allows the County to perform reclamation in the case that the developer abandons the project or does not perform adequate reclamation. Required Elements of Vegetation and Reclamation Plan: Section 1 - Soil Handling. Includes: (i) provisions for salvaging on-site topsoil, (ii) a timetable for eliminating topsoil and/or aggregate piles, (iii) plan that provides for soil cover if any disturbances or stockpiles sit exposed for a period of 90 days or more, and (iv) erosion control barriers and dust suppression measures. Section 2 – Weed Management Plan. Includes: (i) a site specific weed inventory along with a site plan showing County Listed Noxious Weeds and Colorado Listed A & B Noxious Weeds (Contact Garfield County Vegetation Management for updated list), (ii) weed management plan that addresses inventoried weeds in a timely and effective manner. (Note: Garfield County may require the submittal for treatment records.) Section 3 – Site Revegetation and Restoration. Includes: (i) plant material list (be specific, scientific and common names require), (ii) planting schedule (to include timing, methods, and provisions for watering, if applicable.) Section 4 – Cost Estimate. Cost estimate is used to determine the amount of the financial security. Line items within the cost estimate include: (i) mobilization, (ii) earthmoving, (iii) seed and planting, (iv) weed- free mulch, erosion control, and dust suppression, (v) irrigation, and (vi) weed management. (Note: For pipelines and projects in which existing grade is the same as final grade, a cost of $2,500/acre can used to determine the financial security.) Financial Security; Bonds, Letter of Credit valid for a minimum of 2 years or Cash. County Inspection and Release of Financial Security: When grading has been completed and vegetation reestablished, the developer (permit holder) phones County Vegetation Manager (970-945-1377 Ext. 4305) and requests an inspection. If restoration is determined to be adequate, the county will inform the development and release the financial security. APPENDIX J GRADING The provisions contøined ín thís øppendix are not mandøtory unless speciJìcølly referenced in the ødopting ordlnance. lJser note: Code change proposals to lhis chapter will be considered by the IBC - Slructural Code Development Committee during the 2016 (Group B) Code Development Cycle. See explanation on page iv. sEcrloN J101 GENERAL J101.1 Scope. The provisions of this chapter apply to grad- ing, excavation and earthwork construction, including fills and embankments. 'Where conflicts occur between the techni- cal requirements of this chapter and the geotechnical report, the geotechnical report shall govern. JlDl.z Flood hazard areas. Unless the applicant has submit- ted an engineering analysis, prepared in accordance with standard engineering practice by a registered design profes- sional, that demonstrates the proposed work will not result in any increase in the level of the base flood, grading, excava- tion and earthwork construction, including fills and embank- ments, shall not be permitted in floodways that are in flood hazard areas established in Section 1612.3 ot inflood hazard areas where design flood elevations are specified but flood- ways have not been designated. SECTION J102 DEFINITIONS Jl02.l Defïnitions. The following words and terms shall, for the purposes of this appendix, have the meanings shown herein. Refer to Chapter 2 of this code for general definitions. BENCH. A relatively level step excavated into earth material on which fill is to be placed. COMPACTION. The densification of a fill by mechanical means. CUT. See "Excavation." DO\ryN DRAIN. A device for collecting water from a swale or ditch located on or above a slope, and safely delivering it to an approved drainage facility. EROSION. The wearing away of the ground surface as a result of the movement of wind, water or ice. EXCAVATION. The removal of earth material by artificial means, also referred to as a cut. FILL. Deposition of earth materials by artificial means. GRADE. The vertical location of the ground surface' GRADE, EXISTING. The grade prior to grading. GRADE, FINISHED. The grade of the site at the conclusion of all grading efforts. GRADING. An excavation or fill or combination thereof' KEY. A compacted fill placed in a trench excavated in earth material beneath the toe of a slope. SLOPE. An inclined surface, the inclination of which is expressed as a ratio ofhorizontal distance to vertical distance' TERRACE. A relatively level step constructed in the face of a graded slope for drainage and maintenance pu{poses. SECTION Jl03 PERMITS REQUIRED J103.1 Permits required. Except as exempted in Section J103.2, no grading shall be performed without first having obtained a permit therefor from the building fficial. A grad- ing permit does not include the construction of retaining walls or other structures. J103,2 Exemptions. A grading permit shall not be required for the following: 1. Grading in an isolated, self-contained area, provided there is no danger to the public and that such grading will not adversely affect adjoining properties. 2. Excavation for construction of a structure permitted under this code. 3. Cemetery graves. 4. Refuse disposal sites controlled by other regulations. 5. Excavations for wells, or trenches for utilities. 6. Mining, quarrying, excavating, processing or stockpil- ing rock, sand, gravel, aggregate or clay controlled by other regulations, provided such operations do not affect the lateral support of, or significantly increase stresses in, soil on adjoining properties, 7. Exploratory excavations performed under the direction of a registered design professional. Exemption from the permit requirements of this appendix shall not be deemed to grant authorization for any work to be done in any manner in violation of the provisions of this code or any other laws or ordinances of this jurisdiction. SECTION Jl04 PERMIT APPLICATION AND SUBMITTALS J104.1 Submittal requirements. In addition to the provi- sions of Section 105.3, the applicant shall state the estimated quantities of excavation and fill. 2015 INTERNATIONAL BUILDING CODE@ 651 8. Grading that does not exceed 50 cubic yards of earthwork material or 6000 square feet of graded area, whichever is greater. (See amendment.) (See amendment.) (See amendment.) APPENDIX J J104.2 Site plan requirements. In addition to the provisionsof Section 107, a grading plan shall show the existing grade and finished grade in contour intervals of sufficient clarity toindicate the nature and extent of the work and show in detailthat it complies with the requirements of this code. The plansshall show the existing grade on adjoining properties in suffi-cient detail to identify how grade changes will conform to the requirements of this code. J104.3 Geotechnical report. A geotechnical report preparedby a registered design professional shall be provideO. thereport shall contain at least the following: 1. The nature and distribution ofexisting soils. 2. Conclusions and recommendations for grading proce- dures. 3. Soil design criteria for any structures or embankments required to accomplish the proposed grading. 4. Where necessary, slope stability studies, and recom- mendations and conclusions regarding site geology. Exception: A geotechnical report is not required where the building fficial determines that the nature of the work applied for is such that a report is not necessary. J104.4 Liquefaction study. For sites with mapped maximumconsidered eafthquake spectral response accelerations atshort periods (^S") greater than 0.5g as determined by Section 1613, a study of the liquefaction potential of the site shall beprovided and the recommendations incorporated in the plans. Exception: A liquetäction study is not required where thebuílding fficial determines from established local data that the liquefaction potential is low. 1.3. It is no more than 8 feet (2438 mm) in height. 1.4. It is approved by the building code official. 1.5. Ground water is not encountered. 2. A cut surface in bedrock shall be permitted to be at a slope of one unit horizontal to one unit vertical (100- percent slope). SECTION J107 FILLS JL07.1 General. Unless otherwise recommended in the geo- technical report, fills shall comply with the provisions of this section. J107.2 Surface preparation. The ground surface shall beprepared to receive fill by removing vegetation, topsoil andother unsuitable materials, and scarifying the ground to pro- vide a bond with the fill material. J107.3 Benching. Where existing grade is at a slope steeperthan one unit vertical in five units horizontal (20-percent slope) and the depth of the fill exceeds 5 feet (1524 mm) benching shall be provided in accordance with Figure JlOj.3.A key shall be provided that is at least 10 feet (3048 mm) inwidth and 2 feet (610 mm) in depth. J107.4 Fill material. Fill material shall not include organic,frozen or other deleterious materials. No rock or similar irre-ducible material greater than 12 inches (305 mm) in anydimension shall be included in fills. J107.5 Compaction. Al1 fill material shall be compacred to90 percent of maximum density as determined by ASTM D 1557, Modified Proctor, in lifts not exceeding l2 inches (305 mm) in depth. J107.6 Maximum slope. The slope of fill surfaces shall be no steeper than is safe for the intended use. Fill slopes steeperthan one unit verlical in two units horizontal (50-percent slope) shall be justified by a geotechnical report or engineer-ing data. SECTION J108 SETBACKS J108.1 General. Cut and fill slopes shall be set back from thepropefty lines in accordance with this section. Setbackdimensions shall be measured perpendicular to the propertyline and shall be as shown in Figure J108.1, unless substanti-ating data is submitted justifying reduced setbacks. J108.2 Top of slope. The setback at the top of a cut slopeshall be not less than that shown in Figure J108.1, or than isrequired to accommodate any required interceptor drains,whichever is greater. J108.3 Slope protection. Where required to protect adjacentproperties at the toe of a slope from adverse effects of thegrading, additional protection, approved by the buildinC offi.-cial, shall be included. Such protection may include but shall not be limited to: L Setbacks greater than those required by Figure J108.1. sEcTloN J105 INSPECTIONS J105.1 General. Inspections shall be governed by Section 110 ofthis code, J105.2 Special inspections. The special ínspectíon require- ments of Section 1705.6 shall apply to work performed under a grading permit where required by the building fficial. SECT¡ON Jl06 EXCAVATIONS J106.1 Maximum slope. The slope of cut surfaces shall beno steeper than is safe for the intended use, and shall be notmore than one unit vertical in two units horizontal (50-per- cent slope) unless the owner or the owner's authorized agentfurnishes a geotechnical reportjustifying a steeper slope. Exceptions: L A cut surface shall be permitted to be at a slope of 1.5 units horizontal to one unit vertical (67-percent slope) provided that all of the following are met: 1.1. It is not intended to support structures or surcharges. 1.2. It is adequately protected against erosion. 652 2015 INTERNATIONAL BUILDING CODE@ NATURAL SLOPE OVE UNSUITABLE MATERIAL Property APPENDIX J \' SLOPETOP OF FI <- 5 FT. OR GREATER [- ¿ - ¿¿¿ 'lr 5 2 FT. MINIMUM KEY € For SI: I foot = 304.8 mm. Property Line H/5 but 2 ft. and need not exceed 20 ft. maximum Natural or Fìnish Grade For SI: 1 foot = 304.8 mm. \ ro rr. MTNTMUM FIGURE J107.3 BENCHING DETAILS H/5 but 2 ft. min¡mum and need not exceed 10 ft. maximum Cut or Fill Slope FIGURE J108.1 DRAINAGE DIMENS¡ONS Line Top of Slope Top of Slope Natural or F¡nish Grade lnlerceptor Drain(if requìred)h 201 5 INTERNATIONAL BUILDING CODE@ 653 sEcTtoN J10sDRAINAGE AND TERRACING J109.1 General. Unless otherwise recommendedby a regis-tered design professional, drainage facilities and terracingshall be provided in accordance with the requirements of thiisection. Exception: Drainage facilities and terracing need not beprovided where the ground slope is not steeper than oneunit vertical in three units horizontal (33-percent slope). J109.2 Terraces. Terraces at least 6feet(1829 mm) in widthshall be established at not more than 30-foot (9144 mm) ver-tical intervals on all cut or fill slopes to control surface drain- age and debris. Suitable access shall be provided to allow forcleaning and maintenance. Where more than two terraces are required, one terrace,located at approximately mid-height, shall be at least 12 feet(3658 mm) in width. Swales or ditches shall be provided on terraces. They shallhave a minimum gradient of one unit vertical in 20 units hori-zontal (5-percent slope) and shall be paved with concrete notless than 3 inches (76 mm) in thickness, or with other materi-als suitable to the application. They shall have a depth not less than 12 inches (305 mm) and a width not less tha; 5 feet(1524 mm). A single run of swale or ditch shall not collect runoff from a tributary area exceeding 13,500 square feet (1256 m2; (pro-jected) without discharging into a down drain. J109.3 Interceptor drains. Interceptor drains shall bcinstalled along the top of cut slopes receiving drainage from atributary width greater than 40 t'eet (12 I92 mm), measuredhorizontally. They shall have a minimum depth of 1 foot (305mm) and a minimum width of 3 feet (915 mm)^ The slopeshall be approved by the buitding official,but shall be not leìsthan one unit vertical in 50 units horizontal (2-percent slope).The drain shall be paved with concrete not less than 3 inches(76 mm) in thickness, or by other materials suitable to theapplication. Discharge from the drain shall be accomplishedin a manner to prevent erosion and shall be approved by thebuilding fficial. J109.4 Drainage across property lines. Drainage acrosspropefty lines shall not exceed that which existed prior tograding. Excess or concentrated drainage shall be contained on site or directed to an approved drainage facility. Erosion ofthe ground in the area of discharge shall be prevented byinstallation of nonerosive down drains or other dèvices. APPENDIX J 2. Provisions for retaining walls or similar construction. 3. Erosion protection ofthe fill slopes. 4. Provision for the control of surface waters. SECTION Jl1O EROSION CONTROL J110.1 General. The faces of cut and fill slopes shall be pre-pared and maintained to control erosion. This control shall bepermitted to consist of effective planting. Exception: Erosion control measures need not be pro-vided on cut slopes not subject to erosion due to the ero-sion-resistant character of the materials. Erosion control for the slopes shall be installed as soon aspracticable and prior to calling for final inspection. Jll0.2 Other devices. Where necessary, check dams, crib-bing, riprap or other devices or methods shall be employed tocontrol erosion and provide safety. ASTM D 1551 -12 sEciloN J111 REFERENCED STANDARDS Test Method for Laboratory Compaction Characteristics ofSoil Using Modified Effort [56.000 ft-lb/fC ( 2.700kN -rnlm3)] Jr0'7.5 654 2015 INTERNATIONAL BUILDING CODE@ Amendments to Appendix J International Building Code Items 40, 41, 42 Resolution 2016-26 40. Section J103.1 is amended to read as follow: J103.1 Permits required. Except as exempted in Section J103.2, no grading shall be performed without first having obtained a permit from the Garfield County Community Development Department. A grading permit does not include the construction of retaining walls or other structures. Security deposits in a form and amount approved by the Building Official or designee, based upon recommendations from the County Vegetation management Office and the county’s designated engineer shall be established prior to issuance of a major grading permit. 41. Section J103.2 (1.) is amended to read as follows: 1. Grading, excavation and earthwork construction, including fills and embankments that are constructed solely for agricultural purposes on lands that are farms or ranches. 42. Section J103.2 is amended to add an 8th exemption from permit as follows: 8. Grading that does not exceed 50 cubic yards of earthwork material or 6000 Square Feet of graded area, whichever is greater. Xcel Template Tab 6 Control Measure Specifications and Maintenance Requirements (Control Measure Details) XCEL TLINE 6670 CONTROL MEASURE SPECIFICATIONS AND MAINTENANCE REQUIREMENTS Vehicle Tracking Control (VTC) SM-4 November 2010 Urban Drainage and Flood Control District VTC-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph VTC-1. A vehicle tracking control pad constructed with properly sized rock reduces off-site sediment tracking. Description Vehicle tracking controls provide stabilized construction site access where vehicles exit the site onto paved public roads. An effective vehicle tracking control helps remove sediment (mud or dirt) from vehicles, reducing tracking onto the paved surface. Appropriate Uses Implement a stabilized construction entrance or vehicle tracking control where frequent heavy vehicle traffic exits the construction site onto a paved roadway. An effective vehicle tracking control is particularly important during the following conditions:  Wet weather periods when mud is easily tracked off site.  During dry weather periods where dust is a concern.  When poorly drained, clayey soils are present on site. Although wheel washes are not required in designs of vehicle tracking controls, they may be needed at particularly muddy sites. Design and Installation Construct the vehicle tracking control on a level surface. Where feasible, grade the tracking control towards the construction site to reduce off-site runoff. Place signage, as needed, to direct construction vehicles to the designated exit through the vehicle tracking control. There are several different types of stabilized construction entrances including: VTC-1. Aggregate Vehicle Tracking Control. This is a coarse-aggregate surfaced pad underlain by a geotextile. This is the most common vehicle tracking control, and when properly maintained can be effective at removing sediment from vehicle tires. VTC-2. Vehicle Tracking Control with Construction Mat or Turf Reinforcement Mat. This type of control may be appropriate for site access at very small construction sites with low traffic volume over vegetated areas. Although this application does not typically remove sediment from vehicles, it helps protect existing vegetation and provides a stabilized entrance. Vehicle Tracking Control Functions Erosion Control Moderate Sediment Control Yes Site/Material Management Yes SM-4 Vehicle Tracking Control (VTC) VTC-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Photograph VTC-2. A vehicle tracking control pad with wheel wash facility. Photo courtesy of Tom Gore. VTC-3. Stabilized Construction Entrance/Exit with Wheel Wash. This is an aggregate pad, similar to VTC-1, but includes equipment for tire washing. The wheel wash equipment may be as simple as hand-held power washing equipment to more advance proprietary systems. When a wheel wash is provided, it is important to direct wash water to a sediment trap prior to discharge from the site. Vehicle tracking controls are sometimes installed in combination with a sediment trap to treat runoff. Maintenance and Removal Inspect the area for degradation and replace aggregate or material used for a stabilized entrance/exit as needed. If the area becomes clogged and ponds water, remove and dispose of excess sediment or replace material with a fresh layer of aggregate as necessary. With aggregate vehicle tracking controls, ensure rock and debris from this area do not enter the public right-of-way. Remove sediment that is tracked onto the public right of way daily or more frequently as needed. Excess sediment in the roadway indicates that the stabilized construction entrance needs maintenance. Ensure that drainage ditches at the entrance/exit area remain clear. A stabilized entrance should be removed only when there is no longer the potential for vehicle tracking to occur. This is typically after the site has been stabilized. When wheel wash equipment is used, be sure that the wash water is discharged to a sediment trap prior to discharge. Also inspect channels conveying the water from the wash area to the sediment trap and stabilize areas that may be eroding. When a construction entrance/exit is removed, excess sediment from the aggregate should be removed and disposed of appropriately. The entrance should be promptly stabilized with a permanent surface following removal, typically by paving. Vehicle Tracking Control (VTC) SM-4 November 2010 Urban Drainage and Flood Control District VTC-3 Urban Storm Drainage Criteria Manual Volume 3 SM-4 Vehicle Tracking Control (VTC) VTC-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Vehicle Tracking Control (VTC) SM-4 November 2010 Urban Drainage and Flood Control District VTC-5 Urban Storm Drainage Criteria Manual Volume 3 SM-4 Vehicle Tracking Control (VTC) VTC-6 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Temporary and Permanent Seeding (TS/PS) EC-2 June 2012 Urban Drainage and Flood Control District TS/PS-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph TS/PS -1. Equipment used to drill seed. Photo courtesy of Douglas County. Description Temporary seeding can be used to stabilize disturbed areas that will be inactive for an extended period. Permanent seeding should be used to stabilize areas at final grade that will not be otherwise stabilized. Effective seeding includes preparation of a seedbed, selection of an appropriate seed mixture, proper planting techniques, and protection of the seeded area with mulch, geotextiles, or other appropriate measures. Appropriate Uses When the soil surface is disturbed and will remain inactive for an extended period (typically 30 days or longer), proactive stabilization measures should be implemented. If the inactive period is short-lived (on the order of two weeks), techniques such as surface roughening may be appropriate. For longer periods of inactivity, temporary seeding and mulching can provide effective erosion control. Permanent seeding should be used on finished areas that have not been otherwise stabilized. Typically, local governments have their own seed mixes and timelines for seeding. Check jurisdictional requirements for seeding and temporary stabilization. Design and Installation Effective seeding requires proper seedbed preparation, selection of an appropriate seed mixture, use of appropriate seeding equipment to ensure proper coverage and density, and protection with mulch or fabric until plants are established. The USDCM Volume 2 Revegetation Chapter contains detailed seed mix, soil preparations, and seeding and mulching recommendations that may be referenced to supplement this Fact Sheet. Drill seeding is the preferred seeding method. Hydroseeding is not recommended except in areas where steep slopes prevent use of drill seeding equipment, and even in these instances it is preferable to hand seed and mulch. Some jurisdictions do not allow hydroseeding or hydromulching. Seedbed Preparation Prior to seeding, ensure that areas to be revegetated have soil conditions capable of supporting vegetation. Overlot grading can result in loss of topsoil, resulting in poor quality subsoils at the ground surface that have low nutrient value, little organic matter content, few soil microorganisms, rooting restrictions, and conditions less conducive to infiltration of precipitation. As a result, it is typically necessary to provide stockpiled topsoil, compost, or other Temporary and Permanent Seeding Functions Erosion Control Yes Sediment Control No Site/Material Management No EC-2 Temporary and Permanent Seeding (TS/PS) TS/PS-2 Urban Drainage and Flood Control District June 2012 Urban Storm Drainage Criteria Manual Volume 3 soil amendments and rototill them into the soil to a depth of 6 inches or more. Topsoil should be salvaged during grading operations for use and spread on areas to be revegetated later. Topsoil should be viewed as an important resource to be utilized for vegetation establishment, due to its water-holding capacity, structure, texture, organic matter content, biological activity, and nutrient content. The rooting depth of most native grasses in the semi-arid Denver metropolitan area is 6 to 18 inches. At a minimum, the upper 6 inches of topsoil should be stripped, stockpiled, and ultimately respread across areas that will be revegetated. Where topsoil is not available, subsoils should be amended to provide an appropriate plant-growth medium. Organic matter, such as well digested compost, can be added to improve soil characteristics conducive to plant growth. Other treatments can be used to adjust soil pH conditions when needed. Soil testing, which is typically inexpensive, should be completed to determine and optimize the types and amounts of amendments that are required. If the disturbed ground surface is compacted, rip or rototill the surface prior to placing topsoil. If adding compost to the existing soil surface, rototilling is necessary. Surface roughening will assist in placement of a stable topsoil layer on steeper slopes, and allow infiltration and root penetration to greater depth. Prior to seeding, the soil surface should be rough and the seedbed should be firm, but neither too loose nor compacted. The upper layer of soil should be in a condition suitable for seeding at the proper depth and conducive to plant growth. Seed-to-soil contact is the key to good germination. Seed Mix for Temporary Vegetation To provide temporary vegetative cover on disturbed areas which will not be paved, built upon, or fully landscaped or worked for an extended period (typically 30 days or more), plant an annual grass appropriate for the time of planting and mulch the planted areas. Annual grasses suitable for the Denver metropolitan area are listed in Table TS/PS-1. These are to be considered only as general recommendations when specific design guidance for a particular site is not available. Local governments typically specify seed mixes appropriate for their jurisdiction. Seed Mix for Permanent Revegetation To provide vegetative cover on disturbed areas that have reached final grade, a perennial grass mix should be established. Permanent seeding should be performed promptly (typically within 14 days) after reaching final grade. Each site will have different characteristics and a landscape professional or the local jurisdiction should be contacted to determine the most suitable seed mix for a specific site. In lieu of a specific recommendation, one of the perennial grass mixes appropriate for site conditions and growth season listed in Table TS/PS-2 can be used. The pure live seed (PLS) rates of application recommended in these tables are considered to be absolute minimum rates for seed applied using proper drill-seeding equipment. If desired for wildlife habitat or landscape diversity, shrubs such as rubber rabbitbrush (Chrysothamnus nauseosus), fourwing saltbush (Atriplex canescens) and skunkbrush sumac (Rhus trilobata) could be added to the upland seedmixes at 0.25, 0.5 and 1 pound PLS/acre, respectively. In riparian zones, planting root stock of such species as American plum (Prunus americana), woods rose (Rosa woodsii), plains cottonwood (Populus sargentii), and willow (Populus spp.) may be considered. On non-topsoiled upland sites, a legume such as Ladak alfalfa at 1 pound PLS/acre can be included as a source of nitrogen for perennial grasses. Temporary and Permanent Seeding (TS/PS) EC-2 June 2012 Urban Drainage and Flood Control District TS/PS-3 Urban Storm Drainage Criteria Manual Volume 3 Seeding dates for the highest success probability of perennial species along the Front Range are generally in the spring from April through early May and in the fall after the first of September until the ground freezes. If the area is irrigated, seeding may occur in summer months, as well. See Table TS/PS-3 for appropriate seeding dates. Table TS/PS-1. Minimum Drill Seeding Rates for Various Temporary Annual Grasses Speciesa (Common name) Growth Seasonb Pounds of Pure Live Seed (PLS)/acrec Planting Depth (inches) 1. Oats Cool 35 - 50 1 - 2 2. Spring wheat Cool 25 - 35 1 - 2 3. Spring barley Cool 25 - 35 1 - 2 4. Annual ryegrass Cool 10 - 15 ½ 5. Millet Warm 3 - 15 ½ - ¾ 6. Sudangrass Warm 5–10 ½ - ¾ 7. Sorghum Warm 5–10 ½ - ¾ 8. Winter wheat Cool 20–35 1 - 2 9. Winter barley Cool 20–35 1 - 2 10. Winter rye Cool 20–35 1 - 2 11. Triticale Cool 25–40 1 - 2 a Successful seeding of annual grass resulting in adequate plant growth will usually produce enough dead-plant residue to provide protection from wind and water erosion for an additional year. This assumes that the cover is not disturbed or mowed closer than 8 inches. Hydraulic seeding may be substituted for drilling only where slopes are steeper than 3:1 or where access limitations exist. When hydraulic seeding is used, hydraulic mulching should be applied as a separate operation, when practical, to prevent the seeds from being encapsulated in the mulch. b See Table TS/PS-3 for seeding dates. Irrigation, if consistently applied, may extend the use of cool season species during the summer months. c Seeding rates should be doubled if seed is broadcast, or increased by 50 percent if done using a Brillion Drill or by hydraulic seeding. EC-2 Temporary and Permanent Seeding (TS/PS) TS/PS-4 Urban Drainage and Flood Control District June 2012 Urban Storm Drainage Criteria Manual Volume 3 Table TS/PS-2. Minimum Drill Seeding Rates for Perennial Grasses Commona Name Botanical Name Growth Seasonb Growth Form Seeds/ Pound Pounds of PLS/acre Alakali Soil Seed Mix Alkali sacaton Sporobolus airoides Cool Bunch 1,750,000 0.25 Basin wildrye Elymus cinereus Cool Bunch 165,000 2.5 Sodar streambank wheatgrass Agropyron riparium 'Sodar' Cool Sod 170,000 2.5 Jose tall wheatgrass Agropyron elongatum 'Jose' Cool Bunch 79,000 7.0 Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 5.5 Total 17.75 Fertile Loamy Soil Seed Mix Ephriam crested wheatgrass Agropyron cristatum 'Ephriam' Cool Sod 175,000 2.0 Dural hard fescue Festuca ovina 'duriuscula' Cool Bunch 565,000 1.0 Lincoln smooth brome Bromus inermis leyss 'Lincoln' Cool Sod 130,000 3.0 Sodar streambank wheatgrass Agropyron riparium 'Sodar' Cool Sod 170,000 2.5 Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 7.0 Total 15.5 High Water Table Soil Seed Mix Meadow foxtail Alopecurus pratensis Cool Sod 900,000 0.5 Redtop Agrostis alba Warm Open sod 5,000,000 0.25 Reed canarygrass Phalaris arundinacea Cool Sod 68,000 0.5 Lincoln smooth brome Bromus inermis leyss 'Lincoln' Cool Sod 130,000 3.0 Pathfinder switchgrass Panicum virgatum 'Pathfinder' Warm Sod 389,000 1.0 Alkar tall wheatgrass Agropyron elongatum 'Alkar' Cool Bunch 79,000 5.5 Total 10.75 Transition Turf Seed Mixc Ruebens Canadian bluegrass Poa compressa 'Ruebens' Cool Sod 2,500,000 0.5 Dural hard fescue Festuca ovina 'duriuscula' Cool Bunch 565,000 1.0 Citation perennial ryegrass Lolium perenne 'Citation' Cool Sod 247,000 3.0 Lincoln smooth brome Bromus inermis leyss 'Lincoln' Cool Sod 130,000 3.0 Total 7.5 Temporary and Permanent Seeding (TS/PS) EC-2 June 2012 Urban Drainage and Flood Control District TS/PS-5 Urban Storm Drainage Criteria Manual Volume 3 Table TS/PS-2. Minimum Drill Seeding Rates for Perennial Grasses (cont.) Common Name Botanical Name Growth Seasonb Growth Form Seeds/ Pound Pounds of PLS/acre Sandy Soil Seed Mix Blue grama Bouteloua gracilis Warm Sod-forming bunchgrass 825,000 0.5 Camper little bluestem Schizachyrium scoparium 'Camper' Warm Bunch 240,000 1.0 Prairie sandreed Calamovilfa longifolia Warm Open sod 274,000 1.0 Sand dropseed Sporobolus cryptandrus Cool Bunch 5,298,000 0.25 Vaughn sideoats grama Bouteloua curtipendula 'Vaughn' Warm Sod 191,000 2.0 Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 5.5 Total 10.25 Heavy Clay, Rocky Foothill Seed Mix Ephriam crested wheatgrassd Agropyron cristatum 'Ephriam' Cool Sod 175,000 1.5 Oahe Intermediate wheatgrass Agropyron intermedium 'Oahe' Cool Sod 115,000 5.5 Vaughn sideoats gramae Bouteloua curtipendula 'Vaughn' Warm Sod 191,000 2.0 Lincoln smooth brome Bromus inermis leyss 'Lincoln' Cool Sod 130,000 3.0 Arriba western wheatgrass Agropyron smithii 'Arriba' Cool Sod 110,000 5.5 Total 17.5 a All of the above seeding mixes and rates are based on drill seeding followed by crimped straw mulch. These rates should be doubled if seed is broadcast and should be increased by 50 percent if the seeding is done using a Brillion Drill or is applied through hydraulic seeding. Hydraulic seeding may be substituted for drilling only where slopes are steeper than 3:1. If hydraulic seeding is used, hydraulic mulching should be done as a separate operation. b See Table TS/PS-3 for seeding dates. c If site is to be irrigated, the transition turf seed rates should be doubled. d Crested wheatgrass should not be used on slopes steeper than 6H to 1V. e Can substitute 0.5 lbs PLS of blue grama for the 2.0 lbs PLS of Vaughn sideoats grama. EC-2 Temporary and Permanent Seeding (TS/PS) TS/PS-6 Urban Drainage and Flood Control District June 2012 Urban Storm Drainage Criteria Manual Volume 3 Table TS/PS-3. Seeding Dates for Annual and Perennial Grasses Annual Grasses (Numbers in table reference species in Table TS/PS-1) Perennial Grasses Seeding Dates Warm Cool Warm Cool January 1–March 15   March 16–April 30 4 1,2,3   May 1–May 15 4  May 16–June 30 4,5,6,7 July 1–July 15 5,6,7 July 16–August 31 September 1–September 30 8,9,10,11 October 1–December 31   Mulch Cover seeded areas with mulch or an appropriate rolled erosion control product to promote establishment of vegetation. Anchor mulch by crimping, netting or use of a non-toxic tackifier. See the Mulching BMP Fact Sheet for additional guidance. Maintenance and Removal Monitor and observe seeded areas to identify areas of poor growth or areas that fail to germinate. Reseed and mulch these areas, as needed. An area that has been permanently seeded should have a good stand of vegetation within one growing season if irrigated and within three growing seasons without irrigation in Colorado. Reseed portions of the site that fail to germinate or remain bare after the first growing season. Seeded areas may require irrigation, particularly during extended dry periods. Targeted weed control may also be necessary. Protect seeded areas from construction equipment and vehicle access. Mulching (MU) EC-4 June 2012 Urban Drainage and Flood Control District MU-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph MU-1. An area that was recently seeded, mulched, and crimped. Description Mulching consists of evenly applying straw, hay, shredded wood mulch, rock, bark or compost to disturbed soils and securing the mulch by crimping, tackifiers, netting or other measures. Mulching helps reduce erosion by protecting bare soil from rainfall impact, increasing infiltration, and reducing runoff. Although often applied in conjunction with temporary or permanent seeding, it can also be used for temporary stabilization of areas that cannot be reseeded due to seasonal constraints. Mulch can be applied either using standard mechanical dry application methods or using hydromulching equipment that hydraulically applies a slurry of water, wood fiber mulch, and often a tackifier. Appropriate Uses Use mulch in conjunction with seeding to help protect the seedbed and stabilize the soil. Mulch can also be used as a temporary cover on low to mild slopes to help temporarily stabilize disturbed areas where growing season constraints prevent effective reseeding. Disturbed areas should be properly mulched and tacked, or seeded, mulched and tacked promptly after final grade is reached (typically within no longer than 14 days) on portions of the site not otherwise permanently stabilized. Standard dry mulching is encouraged in most jurisdictions; however, hydromulching may not be allowed in certain jurisdictions or may not be allowed near waterways. Do not apply mulch during windy conditions. Design and Installation Prior to mulching, surface-roughen areas by rolling with a crimping or punching type roller or by track walking. Track walking should only be used where other methods are impractical because track walking with heavy equipment typically compacts the soil. A variety of mulches can be used effectively at construction sites. Consider the following: Mulch Functions Erosion Control Yes Sediment Control Moderate Site/Material Management No EC-4 Mulching (MU) MU-2 Urban Drainage and Flood Control District June 2012 Urban Storm Drainage Criteria Manual Volume 3  Clean, weed-free and seed-free cereal grain straw should be applied evenly at a rate of 2 tons per acre and must be tacked or fastened by a method suitable for the condition of the site. Straw mulch must be anchored (and not merely placed) on the surface. This can be accomplished mechanically by crimping or with the aid of tackifiers or nets. Anchoring with a crimping implement is preferred, and is the recommended method for areas flatter than 3:1. Mechanical crimpers must be capable of tucking the long mulch fibers into the soil to a depth of 3 inches without cutting them. An agricultural disk, while not an ideal substitute, may work if the disk blades are dull or blunted and set vertically; however, the frame may have to be weighted to afford proper soil penetration.  Grass hay may be used in place of straw; however, because hay is comprised of the entire plant including seed, mulching with hay may seed the site with non-native grass species which might in turn out-compete the native seed. Alternatively, native species of grass hay may be purchased, but can be difficult to find and are more expensive than straw. Purchasing and utilizing a certified weed-free straw is an easier and less costly mulching method. When using grass hay, follow the same guidelines as for straw (provided above).  On small areas sheltered from the wind and heavy runoff, spraying a tackifier on the mulch is satisfactory for holding it in place. For steep slopes and special situations where greater control is needed, erosion control blankets anchored with stakes should be used instead of mulch.  Hydraulic mulching consists of wood cellulose fibers mixed with water and a tackifying agent and should be applied at a rate of no less than 1,500 pounds per acre (1,425 lbs of fibers mixed with at least 75 lbs of tackifier) with a hydraulic mulcher. For steeper slopes, up to 2000 pounds per acre may be required for effective hydroseeding. Hydromulch typically requires up to 24 hours to dry; therefore, it should not be applied immediately prior to inclement weather. Application to roads, waterways and existing vegetation should be avoided.  Erosion control mats, blankets, or nets are recommended to help stabilize steep slopes (generally 3:1 and steeper) and waterways. Depending on the product, these may be used alone or in conjunction with grass or straw mulch. Normally, use of these products will be restricted to relatively small areas. Biodegradable mats made of straw and jute, straw-coconut, coconut fiber, or excelsior can be used instead of mulch. (See the ECM/TRM BMP for more information.)  Some tackifiers or binders may be used to anchor mulch. Check with the local jurisdiction for allowed tackifiers. Manufacturer's recommendations should be followed at all times. (See the Soil Binder BMP for more information on general types of tackifiers.)  Rock can also be used as mulch. It provides protection of exposed soils to wind and water erosion and allows infiltration of precipitation. An aggregate base course can be spread on disturbed areas for temporary or permanent stabilization. The rock mulch layer should be thick enough to provide full coverage of exposed soil on the area it is applied. Maintenance and Removal After mulching, the bare ground surface should not be more than 10 percent exposed. Reapply mulch, as needed, to cover bare areas. Protection of Existing Vegetation (PV) SM-2 November 2010 Urban Drainage and Flood Control District PV-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph PV-1. Protection of existing vegetation and a sensitive area. Photo courtesy of CDOT. Description Protection of existing vegetation on a construction site can be accomplished through installation of a construction fence around the area requiring protection. In cases where upgradient areas are disturbed, it may also be necessary to install perimeter controls to minimize sediment loading to sensitive areas such as wetlands. Existing vegetation may be designated for protection to maintain a stable surface cover as part of construction phasing, or vegetation may be protected in areas designated to remain in natural condition under post-development conditions (e.g., wetlands, mature trees, riparian areas, open space). Appropriate Uses Existing vegetation should be preserved for the maximum practical duration on a construction site through the use of effective construction phasing. Preserving vegetation helps to minimize erosion and can reduce revegetation costs following construction. Protection of wetland areas is required under the Clean Water Act, unless a permit has been obtained from the U.S. Army Corps of Engineers (USACE) allowing impacts in limited areas. If trees are to be protected as part of post-development landscaping, care must be taken to avoid several types of damage, some of which may not be apparent at the time of injury. Potential sources of injury include soil compaction during grading or due to construction traffic, direct equipment-related injury such as bark removal, branch breakage, surface grading and trenching, and soil cut and fill. In order to minimize injuries that may lead to immediate or later death of the tree, tree protection zones should be developed during site design, implemented at the beginning of a construction project, as well as continued during active construction. Design and Installation General Once an area has been designated as a preservation area, there should be no construction activity allowed within a set distance of the area. Clearly mark the area with construction fencing. Do not allow stockpiles, equipment, trailers or parking within the protected area. Guidelines to protect various types of existing vegetation follow. Protection of Existing Vegetation Functions Erosion Control Yes Sediment Control Moderate Site/Material Management Yes SM-2 Protection of Existing Vegetation (PV) PV-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Surface Cover During Phased Construction Install construction fencing or other perimeter controls around areas to be protected from clearing and grading as part of construction phasing. Maintaining surface cover on steep slopes for the maximum practical duration during construction is recommended. Open Space Preservation Where natural open space areas will be preserved as part of a development, it is important to install construction fencing around these areas to protect them from compaction. This is particularly important when areas with soils with high infiltration rates are preserved as part of LID designs. Preserved open space areas should not be used for staging and equipment storage. Wetlands and Riparian Areas Install a construction fence around the perimeter of the wetland or riparian (streamside vegetation) area to prevent access by equipment. In areas downgradient of disturbed areas, install a perimeter control such as silt fence, sediment control logs, or similar measure to minimize sediment loading to the wetland. Tree Protection 1  Before beginning construction operations, establish a tree protection zone around trees to be preserved by installing construction fences. Allow enough space from the trunk to protect the root zone from soil compaction and mechanical damage, and the branches from mechanical damage (see Table PV-1). If low branches will be kept, place the fence outside of the drip line. Where this is not possible, place fencing as far away from the trunk as possible. In order to maintain a healthy tree, be aware that about 60 percent of the tree's root zone extends beyond the drip line. Table PV-1 Guidelines for Determining the Tree Protection Zone (Source: Matheny and Clark, 1998; as cited in GreenCO and WWE 2008) Distance from Trunk (ft) per inch of DBH Species Tolerance to Damage Young Mature Over mature Good 0.5' 0.75' 1.0' Moderate 0.75' 1.0' 1.25' Poor 1.0' 1.25' 1.5' Notes: DBH = diameter at breast height (4.5 ft above grade); Young = <20% of life expectancy; Mature = 20%-80% of life expectancy; Over mature =>80% of life expectancy  Most tree roots grow within the top 12 to 18 inches of soil. Grade changes within the tree protection zone should be avoided where possible because seemingly minor grade changes can either smother 1 Tree Protection guidelines adapted from GreenCO and WWE (2008). Green Industry Best Management Practices (BMPs) for the Conservation and Protection of Water Resources in Colorado: Moving Toward Sustainability, Third Release. See www.greenco.org for more detailed guidance on tree preservation. Protection of Existing Vegetation (PV) SM-2 November 2010 Urban Drainage and Flood Control District PV-3 Urban Storm Drainage Criteria Manual Volume 3 roots (in fill situations) or damage roots (in cut situations). Consider small walls where needed to avoid grade changes in the tree protection zone.  Place and maintain a layer of mulch 4 to 6-inch thick from the tree trunk to the fencing, keeping a 6-inch space between the mulch and the trunk. Mulch helps to preserve moisture and decrease soil compaction if construction traffic is unavoidable. When planting operations are completed, the mulch may be reused throughout planting areas.  Limit access, if needed at all, and appoint one route as the main entrance and exit to the tree protection zone. Within the tree protection zone, do not allow any equipment to be stored, chemicals to be dumped, or construction activities to take place except fine grading, irrigation system installation, and planting operations. These activities should be conducted in consultation with a landscaping professional, following Green Industry BMPs.  Be aware that soil compaction can cause extreme damage to tree health that may appear gradually over a period of years. Soil compaction is easier to prevent than repair. Maintenance and Removal Repair or replace damaged or displaced fencing or other protective barriers around the vegetated area. If damage occurs to a tree, consult an arborist for guidance on how to care for the tree. If a tree in a designated preservation area is damaged beyond repair, remove and replace with a 2-inch diameter tree of the same or similar species. Construction equipment must not enter a wetland area, except as permitted by the U.S. Army Corps of Engineers (USACE). Inadvertent placement of fill in a wetland is a 404 permit violation and will require notification of the USACE. If damage to vegetation occurs in a protected area, reseed the area with the same or similar species, following the recommendations in the USDCM Revegetation chapter. Temporary Outlet Protection (TOP) EC-8 November 2010 Urban Drainage and Flood Control District TOP-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph TOP-1. Riprap outlet protection. Description Outlet protection helps to reduce erosion immediately downstream of a pipe, culvert, slope drain, rundown or other conveyance with concentrated, high- velocity flows. Typical outlet protection consists of riprap or rock aprons at the conveyance outlet. Appropriate Uses Outlet protection should be used when a conveyance discharges onto a disturbed area where there is potential for accelerated erosion due to concentrated flow. Outlet protection should be provided where the velocity at the culvert outlet exceeds the maximum permissible velocity of the material in the receiving channel. Note: This Fact Sheet and detail are for temporary outlet protection, outlets that are intended to be used for less than 2 years. For permanent, long-term outlet protection, see the Major Drainage chapter of Volume 1. Design and Installation Design outlet protection to handle runoff from the largest drainage area that may be contributing runoff during construction (the drainage area may change as a result of grading). Key in rock, around the entire perimeter of the apron, to a minimum depth of 6 inches for stability. Extend riprap to the height of the culvert or the normal flow depth of the downstream channel, whichever is less. Additional erosion control measures such as vegetative lining, turf reinforcement mat and/or other channel lining methods may be required downstream of the outlet protection if the channel is susceptible to erosion. See Design Detail OP-1 for additional information. Maintenance and Removal Inspect apron for damage and displaced rocks. If rocks are missing or significantly displaced, repair or replace as necessary. If rocks are continuously missing or displaced, consider increasing the size of the riprap or deeper keying of the perimeter. Remove sediment accumulated at the outlet before the outlet protection becomes buried and ineffective. When sediment accumulation is noted, check that upgradient BMPs, including inlet protection, are in effective operating condition. Outlet protection may be removed once the pipe is no longer draining an upstream area, or once the downstream area has been sufficiently stabilized. If the drainage pipe is permanent, outlet protection can be left in place; however, permanent outlet protection should be designed and constructed in accordance with the requirements of the Major Drainage chapter of Volume 2. Outlet Protection Functions Erosion Control Yes Sediment Control Moderate Site/Material Management No EC-8 Temporary Outlet Protection (TOP) TOP-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Temporary Outlet Protection (TOP) EC-8 November 2010 Urban Drainage and Flood Control District TOP-3 Urban Storm Drainage Criteria Manual Volume 3 Surface Roughening (SR) EC-1 November 2010 Urban Drainage and Flood Control District SR-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph SR-1. Surface roughening via imprinting for temporary stabilization. Description Surface roughening is an erosion control practice that involves tracking, scarifying, imprinting, or tilling a disturbed area to provide temporary stabilization of disturbed areas. Surface roughening creates variations in the soil surface that help to minimize wind and water erosion. Depending on the technique used, surface roughening may also help establish conditions favorable to establishment of vegetation. Appropriate Uses Surface roughening can be used to provide temporary stabilization of disturbed areas, such as when revegetation cannot be immediately established due to seasonal planting limitations. Surface roughening is not a stand-alone BMP, and should be used in conjunction with other erosion and sediment controls. Surface roughening is often implemented in conjunction with grading and is typically performed using heavy construction equipment to track the surface. Be aware that tracking with heavy equipment will also compact soils, which is not desirable in areas that will be revegetated. Scarifying, tilling, or ripping are better surface roughening techniques in locations where revegetation is planned. Roughening is not effective in very sandy soils and cannot be effectively performed in rocky soil. Design and Installation Typical design details for surfacing roughening on steep and mild slopes are provided in Details SR-1 and SR-2, respectively. Surface roughening should be performed either after final grading or to temporarily stabilize an area during active construction that may be inactive for a short time period. Surface roughening should create depressions 2 to 6 inches deep and approximately 6 inches apart. The surface of exposed soil can be roughened by a number of techniques and equipment. Horizontal grooves (running parallel to the contours of the land) can be made using tracks from equipment treads, stair-step grading, ripping, or tilling. Fill slopes can be constructed with a roughened surface. Cut slopes that have been smooth graded can be roughened as a subsequent operation. Roughening should follow along the contours of the slope. The tracks left by truck mounted equipment working perpendicular to the contour can leave acceptable horizontal depressions; however, the equipment will also compact the soil. Surface Roughening Functions Erosion Control Yes Sediment Control No Site/Material Management No EC-1 Surface Roughening (SR) SR-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Maintenance and Removal Care should be taken not to drive vehicles or equipment over areas that have been surface roughened. Tire tracks will smooth the roughened surface and may cause runoff to collect into rills and gullies. Because surface roughening is only a temporary control, additional treatments may be necessary to maintain the soil surface in a roughened condition. Areas should be inspected for signs of erosion. Surface roughening is a temporary measure, and will not provide long-term erosion control. Surface Roughening (SR) EC-1 November 2010 Urban Drainage and Flood Control District SR-3 Urban Storm Drainage Criteria Manual Volume 3 EC-1 Surface Roughening (SR) SR-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Construction Phasing/Sequencing (CP) SM-1 November 2010 Urban Drainage and Flood Control District CP-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph CP-1. Construction phasing to avoid disturbing the entire area at one time. Photo courtesy of WWE. Description Effective construction site management to minimize erosion and sediment transport includes attention to construction phasing, scheduling, and sequencing of land disturbing activities. On most construction projects, erosion and sediment controls will need to be adjusted as the project progresses and should be documented in the SWMP. Construction phasing refers to disturbing only part of a site at a time to limit the potential for erosion from dormant parts of a site. Grading activities and construction are completed and soils are effectively stabilized on one part of a site before grading and construction begins on another portion of the site. Construction sequencing or scheduling refers to a specified work schedule that coordinates the timing of land disturbing activities and the installation of erosion and sediment control practices. Appropriate Uses All construction projects can benefit from upfront planning to phase and sequence construction activities to minimize the extent and duration of disturbance. Larger projects and linear construction projects may benefit most from construction sequencing or phasing, but even small projects can benefit from construction sequencing that minimizes the duration of disturbance. Typically, erosion and sediment controls needed at a site will change as a site progresses through the major phases of construction. Erosion and sediment control practices corresponding to each phase of construction must be documented in the SWMP. Design and Installation BMPs appropriate to the major phases of development should be identified on construction drawings. In some cases, it will be necessary to provide several drawings showing construction-phase BMPs placed according to stages of development (e.g., clearing and grading, utility installation, active construction, final stabilization). Some municipalities in the Denver area set maximum sizes for disturbed area associated with phases of a construction project. Additionally, requirements for phased construction drawings vary among local governments within the UDFCD boundary. Some local governments require separate erosion and sediment control drawings for initial BMPs, interim conditions (in active construction), and final stabilization. Construction Scheduling Functions Erosion Control Moderate Sediment Control Moderate Site/Material Management Yes SM-1 Construction Phasing/Sequencing (CP) CP-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Typical construction phasing BMPs include:  Limit the amount of disturbed area at any given time on a site to the extent practical. For example, a 100-acre subdivision might be constructed in five phases of 20 acres each.  If there is carryover of stockpiled material from one phase to the next, position carryover material in a location easily accessible for the pending phase that will not require disturbance of stabilized areas to access the stockpile. Particularly with regard to efforts to balance cut and fill at a site, careful planning for location of stockpiles is important. Typical construction sequencing BMPs include:  Sequence construction activities to minimize duration of soil disturbance and exposure. For example, when multiple utilities will occupy the same trench, schedule installation so that the trench does not have to be closed and opened multiple times.  Schedule site stabilization activities (e.g., landscaping, seeding and mulching, installation of erosion control blankets) as soon as feasible following grading.  Install initial erosion and sediment control practices before construction begins. Promptly install additional BMPs for inlet protection, stabilization, etc., as construction activities are completed. Table CP-1 provides typical sequencing of construction activities and associated BMPs. Maintenance and Removal When the construction schedule is altered, erosion and sediment control measures in the SWMP and construction drawings should be appropriately adjusted to reflect actual "on the ground" conditions at the construction site. Be aware that changes in construction schedules can have significant implications for site stabilization, particularly with regard to establishment of vegetative cover. Construction Phasing/Sequencing (CP) SM-1 November 2010 Urban Drainage and Flood Control District CP-3 Urban Storm Drainage Criteria Manual Volume 3 Table CP -1. Typical Phased BMP Installation for Construction Projects Project Phase BMPs Pre- disturbance, Site Access  Install sediment controls downgradient of access point (on paved streets this may consist of inlet protection).  Establish vehicle tracking control at entrances to paved streets. Fence as needed.  Use construction fencing to define the boundaries of the project and limit access to areas of the site that are not to be disturbed. Note: it may be necessary to protect inlets in the general vicinity of the site, even if not downgradient, if there is a possibility that sediment tracked from the site could contribute to the inlets. Site Clearing and Grubbing  Install perimeter controls as needed on downgradient perimeter of site (silt fence, wattles, etc).  Limit disturbance to those areas planned for disturbance and protect undisturbed areas within the site (construction fence, flagging, etc).  Preserve vegetative buffer at site perimeter.  Create stabilized staging area.  Locate portable toilets on flat surfaces away from drainage paths. Stake in areas susceptible to high winds.  Construct concrete washout area and provide signage.  Establish waste disposal areas.  Install sediment basins.  Create dirt perimeter berms and/or brush barriers during grubbing and clearing.  Separate and stockpile topsoil, leave roughened and/or cover.  Protect stockpiles with perimeter control BMPs. Stockpiles should be located away from drainage paths and should be accessed from the upgradient side so that perimeter controls can remain in place on the downgradient side. Use erosion control blankets, temporary seeding, and/or mulch for stockpiles that will be inactive for an extended period.  Leave disturbed area of site in a roughened condition to limit erosion. Consider temporary revegetation for areas of the site that have been disturbed but that will be inactive for an extended period.  Water to minimize dust but not to the point that watering creates runoff. SM-1 Construction Phasing/Sequencing (CP) CP-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Project Phase BMPs Utility And Infrastructure Installation In Addition to the Above BMPs:  Close trench as soon as possible (generally at the end of the day).  Use rough-cut street control or apply road base for streets that will not be promptly paved.  Provide inlet protection as streets are paved and inlets are constructed.  Protect and repair BMPs, as necessary.  Perform street sweeping as needed. Building Construction In Addition to the Above BMPs:  Implement materials management and good housekeeping practices for home building activities.  Use perimeter controls for temporary stockpiles from foundation excavations.  For lots adjacent to streets, lot-line perimeter controls may be necessary at the back of curb. Final Grading In Addition to the Above BMPs:  Remove excess or waste materials.  Remove stored materials. Final Stabilization In Addition to the Above BMPs:  Seed and mulch/tackify.  Seed and install blankets on steep slopes.  Remove all temporary BMPs when site has reached final stabilization. Temporary Stream Crossing (TSC) SM-10 June 2012 Urban Drainage and Flood Control District TSC-1 Urban Storm Drainage Criteria Manual Volume 3 Description Where an actively flowing watercourse must be crossed regularly by construction vehicles, a temporary crossing should be provided. Three primary methods are available:  Culvert crossing  Stream ford  Temporary bridge Culvert crossings and fords are the most commonly used methods. Due to the expense associated with a temporary bridge, these are used primarily on long- term projects. Appropriate Uses Construction vehicles shall be kept out of waterways to the maximum extent practicable. Use a temporary stream crossing when it is absolutely necessary to cross a stream on a construction site. Construct a temporary crossing even if the stream or drainageway is typically dry. Multiple stream crossings should be avoided to minimize environmental impacts. A permit is required for placement of fill in a waterway under Section 404 of the Clean Water Act. The local office of the U.S. Army Corps of Engineers (USACE) should be contacted concerning the requirements for obtaining a 404 permit. In addition, a permit from the U.S. Fish and Wildlife Service (USFWS) may be needed if endangered species are of concern in the work area. Typically, the USFWS issues are addressed by a 404 permit, if one is required. The municipality of jurisdiction should also be consulted, and can provide assistance. Other permits to be obtained may include a floodplain development permit from the local jurisdiction. Design and Installation Design details are provided for these types of stream crossings: TSC-1. Culvert Crossing TSC-2. Ford Crossing TSC-3. Flume Crossing Temporary Stream Crossing Functions Erosion Control Yes Sediment Control Yes Site/Material Management No Photograph TSC-1. A temporary stream crossing using culverts. Photo courtesy of Tom Gore. SM-10 Temporary Stream Crossing (TSC) TSC-2 Urban Drainage and Flood Control District June 2012 Urban Storm Drainage Criteria Manual Volume 3 A culvert crossing should be sized appropriately with consideration for the duration of construction and seasonal variation of flows. The sizing methodology provided in the Temporary Diversion Methods Fact Sheet is also appropriate for determining the design flow for temporary stream crossings. Culvert sizing must account for the headwater and tailwater controls to properly size the culvert. For additional discussion on design of box culverts and pipes, see the Major Drainage chapter in Volume 1. The designer also needs to confirm that the riprap selected is appropriate for the conditions in the channel being crossed. When a ford must be used, namely when a culvert is not practical or the best solution, the ford should be lined with at least a 12-inch thick layer of Type VL (D50 = 6 inches) or Type L (D50 = 9 inches) riprap with void spaces filed with 1-1/2 inch diameter rock. Ford crossings are recommended primarily for crossings of ephemeral (i.e. intermittently, briefly flowing) streams. For a temporary bridge crossing, consult with a structural and/or geotechnical engineer for temporary bridge design or consider pre-fabricated alternatives. Maintenance and Removal Inspect stream for bank erosion and in-stream degradation. If bank erosion is occurring, stabilize banks using erosion control practices such as erosion control blankets. If in-stream degradation is occurring, armor the culvert outlet(s) with riprap to dissipate energy. If sediment is accumulating upstream of the crossing, remove excess sediment as needed to maintain the functionality of the crossing. Remove the temporary crossing when it is no longer needed for construction. Take care to minimize the amount of sediment lost into the stream upon removal. Once the crossing has been removed, stabilize the stream banks with seed and erosion control blankets. Temporary Stream Crossing (TSC) SM-10 June 2012 Urban Drainage and Flood Control District TSC-3 Urban Storm Drainage Criteria Manual Volume 3 SM-10 Temporary Stream Crossing (TSC) TSC-4 Urban Drainage and Flood Control District June 2012 Urban Storm Drainage Criteria Manual Volume 3 Temporary Stream Crossing (TSC) SM-10 June 2012 Urban Drainage and Flood Control District TSC-5 Urban Storm Drainage Criteria Manual Volume 3 SM-10 Temporary Stream Crossing (TSC) TSC-6 Urban Drainage and Flood Control District June 2012 Urban Storm Drainage Criteria Manual Volume 3 Good Housekeeping Practices (GH) MM-3 November 2010 Urban Drainage and Flood Control District GH-1 Urban Storm Drainage Criteria Manual Volume 3 Photographs GH-1 and GH-2. Proper materials storage and secondary containment for fuel tanks are important good housekeeping practices. Photos courtesy of CDOT and City of Aurora. Description Implement construction site good housekeeping practices to prevent pollution associated with solid, liquid and hazardous construction-related materials and wastes. Stormwater Management Plans (SWMPs) should clearly specify BMPs including these good housekeeping practices:  Provide for waste management.  Establish proper building material staging areas.  Designate paint and concrete washout areas.  Establish proper equipment/vehicle fueling and maintenance practices.  Control equipment/vehicle washing and allowable non- stormwater discharges.  Develop a spill prevention and response plan. Acknowledgement: This Fact Sheet is based directly on EPA guidance provided in Developing Your Stormwater Pollution Prevent Plan (EPA 2007). Appropriate Uses Good housekeeping practices are necessary at all construction sites. Design and Installation The following principles and actions should be addressed in SWMPs:  Provide for Waste Management. Implement management procedures and practices to prevent or reduce the exposure and transport of pollutants in stormwater from solid, liquid and sanitary wastes that will be generated at the site. Practices such as trash disposal, recycling, proper material handling, and cleanup measures can reduce the potential for stormwater runoff to pick up construction site wastes and discharge them to surface waters. Implement a comprehensive set of waste-management practices for hazardous or toxic materials, such as paints, solvents, petroleum products, pesticides, wood preservatives, acids, roofing tar, and other materials. Practices should include storage, handling, inventory, and cleanup procedures, in case of spills. Specific practices that should be considered include: Solid or Construction Waste o Designate trash and bulk waste-collection areas on- site. Good Housekeeping Functions Erosion Control No Sediment Control No Site/Material Management Yes MM-3 Good Housekeeping Practices (GH) GH-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Photograph GH-3. Locate portable toilet facilities on level surfaces away from waterways and storm drains. Photo courtesy of WWE. o Recycle materials whenever possible (e.g., paper, wood, concrete, oil). o Segregate and provide proper disposal options for hazardous material wastes. o Clean up litter and debris from the construction site daily. o Locate waste-collection areas away from streets, gutters, watercourses, and storm drains. Waste- collection areas (dumpsters, and such) are often best located near construction site entrances to minimize traffic on disturbed soils. Consider secondary containment around waste collection areas to minimize the likelihood of contaminated discharges. o Empty waste containers before they are full and overflowing. Sanitary and Septic Waste o Provide convenient, well-maintained, and properly located toilet facilities on-site. o Locate toilet facilities away from storm drain inlets and waterways to prevent accidental spills and contamination of stormwater. o Maintain clean restroom facilities and empty portable toilets regularly. o Where possible, provide secondary containment pans under portable toilets. o Provide tie-downs or stake-downs for portable toilets. o Educate employees, subcontractors, and suppliers on locations of facilities. o Treat or dispose of sanitary and septic waste in accordance with state or local regulations. Do not discharge or bury wastewater at the construction site. o Inspect facilities for leaks. If found, repair or replace immediately. o Special care is necessary during maintenance (pump out) to ensure that waste and/or biocide are not spilled on the ground. Hazardous Materials and Wastes o Develop and implement employee and subcontractor education, as needed, on hazardous and toxic waste handling, storage, disposal, and cleanup. o Designate hazardous waste-collection areas on-site. o Place all hazardous and toxic material wastes in secondary containment. Good Housekeeping Practices (GH) MM-3 November 2010 Urban Drainage and Flood Control District GH-3 Urban Storm Drainage Criteria Manual Volume 3 o Hazardous waste containers should be inspected to ensure that all containers are labeled properly and that no leaks are present.  Establish Proper Building Material Handling and Staging Areas. The SWMP should include comprehensive handling and management procedures for building materials, especially those that are hazardous or toxic. Paints, solvents, pesticides, fuels and oils, other hazardous materials or building materials that have the potential to contaminate stormwater should be stored indoors or under cover whenever possible or in areas with secondary containment. Secondary containment measures prevent a spill from spreading across the site and may include dikes, berms, curbing, or other containment methods. Secondary containment techniques should also ensure the protection of groundwater. Designate staging areas for activities such as fueling vehicles, mixing paints, plaster, mortar, and other potential pollutants. Designated staging areas enable easier monitoring of the use of materials and clean up of spills. Training employees and subcontractors is essential to the success of this pollution prevention principle. Consider the following specific materials handling and staging practices: o Train employees and subcontractors in proper handling and storage practices. o Clearly designate site areas for staging and storage with signs and on construction drawings. Staging areas should be located in areas central to the construction site. Segment the staging area into sub-areas designated for vehicles, equipment, or stockpiles. Construction entrances and exits should be clearly marked so that delivery vehicles enter/exit through stabilized areas with vehicle tracking controls (See Vehicle Tracking Control Fact Sheet). o Provide storage in accordance with Spill Protection, Control and Countermeasures (SPCC) requirements and plans and provide cover and impermeable perimeter control, as necessary, for hazardous materials and contaminated soils that must be stored on site. o Ensure that storage containers are regularly inspected for leaks, corrosion, support or foundation failure, or other signs of deterioration and tested for soundness. o Reuse and recycle construction materials when possible.  Designate Concrete Washout Areas. Concrete contractors should be encouraged to use the washout facilities at their own plants or dispatch facilities when feasible; however, concrete washout commonly occurs on construction sites. If it is necessary to provide for concrete washout areas on- site, designate specific washout areas and design facilities to handle anticipated washout water. Washout areas should also be provided for paint and stucco operations. Because washout areas can be a source of pollutants from leaks or spills, care must be taken with regard to their placement and proper use. See the Concrete Washout Area Fact Sheet for detailed guidance. Both self-constructed and prefabricated washout containers can fill up quickly when concrete, paint, and stucco work are occurring on large portions of the site. Be sure to check for evidence that contractors are using the washout areas and not dumping materials onto the ground or into drainage facilities. If the washout areas are not being used regularly, consider posting additional signage, relocating the facilities to more convenient locations, or providing training to workers and contractors. When concrete, paint, or stucco is part of the construction process, consider these practices which will help prevent contamination of stormwater. Include the locations of these areas and the maintenance and inspection procedures in the SWMP. MM-3 Good Housekeeping Practices (GH) GH-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 o Do not washout concrete trucks or equipment into storm drains, streets, gutters, uncontained areas, or streams. Only use designated washout areas. o Establish washout areas and advertise their locations with signs. Ensure that signage remains in good repair. o Provide adequate containment for the amount of wash water that will be used. o Inspect washout structures daily to detect leaks or tears and to identify when materials need to be removed. o Dispose of materials properly. The preferred method is to allow the water to evaporate and to recycle the hardened concrete. Full service companies may provide dewatering services and should dispose of wastewater properly. Concrete wash water can be highly polluted. It should not be discharged to any surface water, storm sewer system, or allowed to infiltrate into the ground in the vicinity of waterbodies. Washwater should not be discharged to a sanitary sewer system without first receiving written permission from the system operator.  Establish Proper Equipment/Vehicle Fueling and Maintenance Practices. Create a clearly designated on-site fueling and maintenance area that is clean and dry. The on-site fueling area should have a spill kit, and staff should know how to use it. If possible, conduct vehicle fueling and maintenance activities in a covered area. Consider the following practices to help prevent the discharge of pollutants to stormwater from equipment/vehicle fueling and maintenance. Include the locations of designated fueling and maintenance areas and inspection and maintenance procedures in the SWMP. o Train employees and subcontractors in proper fueling procedures (stay with vehicles during fueling, proper use of pumps, emergency shutoff valves, etc.). o Inspect on-site vehicles and equipment regularly for leaks, equipment damage, and other service problems. o Clearly designate vehicle/equipment service areas away from drainage facilities and watercourses to prevent stormwater run-on and runoff. o Use drip pans, drip cloths, or absorbent pads when replacing spent fluids. o Collect all spent fluids, store in appropriate labeled containers in the proper storage areas, and recycle fluids whenever possible.  Control Equipment/Vehicle Washing and Allowable Non-Stormwater Discharges. Implement practices to prevent contamination of surface and groundwater from equipment and vehicle wash water. Representative practices include: o Educate employees and subcontractors on proper washing procedures. o Use off-site washing facilities, when available. o Clearly mark the washing areas and inform workers that all washing must occur in this area. o Contain wash water and treat it using BMPs. Infiltrate washwater when possible, but maintain separation from drainage paths and waterbodies. Good Housekeeping Practices (GH) MM-3 November 2010 Urban Drainage and Flood Control District GH-5 Urban Storm Drainage Criteria Manual Volume 3 o Use high-pressure water spray at vehicle washing facilities without detergents. Water alone can remove most dirt adequately. o Do not conduct other activities, such as vehicle repairs, in the wash area. o Include the location of the washing facilities and the inspection and maintenance procedures in the SWMP.  Develop a Spill Prevention and Response Plan. Spill prevention and response procedures must be identified in the SWMP. Representative procedures include identifying ways to reduce the chance of spills, stop the source of spills, contain and clean up spills, dispose of materials contaminated by spills, and train personnel responsible for spill prevention and response. The plan should also specify material handling procedures and storage requirements and ensure that clear and concise spill cleanup procedures are provided and posted for areas in which spills may potentially occur. When developing a spill prevention plan, include the following: o Note the locations of chemical storage areas, storm drains, tributary drainage areas, surface waterbodies on or near the site, and measures to stop spills from leaving the site. o Provide proper handling and safety procedures for each type of waste. Keep Material Safety Data Sheets (MSDSs) for chemical used on site with the SWMP. o Establish an education program for employees and subcontractors on the potential hazards to humans and the environment from spills and leaks. o Specify how to notify appropriate authorities, such as police and fire departments, hospitals, or municipal sewage treatment facilities to request assistance. Emergency procedures and contact numbers should be provided in the SWMP and posted at storage locations. o Describe the procedures, equipment and materials for immediate cleanup of spills and proper disposal. o Identify personnel responsible for implementing the plan in the event of a spill. Update the spill prevention plan and clean up materials as changes occur to the types of chemicals stored and used at the facility. MM-3 Good Housekeeping Practices (GH) GH-6 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Spill Prevention, Control, and Countermeasure (SPCC) Plan Construction sites may be subject to 40 CFR Part 112 regulations that require the preparation and implementation of a SPCC Plan to prevent oil spills from aboveground and underground storage tanks. The facility is subject to this rule if it is a non-transportation-related facility that:  Has a total storage capacity greater than 1,320 gallons or a completely buried storage capacity greater than 42,000 gallons.  Could reasonably be expected to discharge oil in quantities that may be harmful to navigable waters of the United States and adjoining shorelines. Furthermore, if the facility is subject to 40 CFR Part 112, the SWMP should reference the SPCC Plan. To find out more about SPCC Plans, see EPA's website on SPPC at www.epa.gov/oilspill/spcc.htm. Reporting Oil Spills In the event of an oil spill, contact the National Response Center toll free at 1-800-424- 8802 for assistance, or for more details, visit their website: www.nrc.uscg.mil. Maintenance and Removal Effective implementation of good housekeeping practices is dependent on clear designation of personnel responsible for supervising and implementing good housekeeping programs, such as site cleanup and disposal of trash and debris, hazardous material management and disposal, vehicle and equipment maintenance, and other practices. Emergency response "drills" may aid in emergency preparedness. Checklists may be helpful in good housekeeping efforts. Staging and storage areas require permanent stabilization when the areas are no longer being used for construction-related activities. Construction-related materials, debris and waste must be removed from the construction site once construction is complete. Design Details See the following Fact Sheets for related Design Details: MM-1 Concrete Washout Area MM-2 Stockpile Management SM-4 Vehicle Tracking Control Design details are not necessary for other good housekeeping practices; however, be sure to designate where specific practices will occur on the appropriate construction drawings. Sediment Control Log (SCL) SC-2 November 2015 Urban Drainage and Flood Control District SCL-1 Urban Storm Drainage Criteria Manual Volume 3 Photographs SCL-1 and SCL-2. Sediment control logs used as 1) a perimeter control around a soil stockpile; and, 2) as a "J-hook" perimeter control at the corner of a construction site. Description A sediment control log is a linear roll made of natural materials such as straw, coconut fiber, or compost. The most common type of sediment control log has straw filling and is often referred to as a "straw wattle." All sediment control logs are used as a sediment barrier to intercept sheet flow runoff from disturbed areas. Appropriate Uses Sediment control logs can be used in the following applications to trap sediment:  As perimeter control for stockpiles and the site.  As part of inlet protection designs.  As check dams in small drainage ditches. (Sediment control logs are not intended for use in channels with high flow velocities.)  On disturbed slopes to shorten flow lengths (as an erosion control).  As part of multi-layered perimeter control along a receiving water such as a stream, pond or wetland. Sediment control logs work well in combination with other layers of erosion and sediment controls. Design and Installation Sediment control logs should be installed along the contour to avoid concentrating flows. The maximum allowable tributary drainage area per 100 lineal feet of sediment control log, installed along the contour, is approximately 0.25 acres with a disturbed slope length of up to 150 feet and a tributary slope gradient no steeper than 3:1. Longer and steeper slopes require additional measures. This recommendation only applies to sediment control logs installed along the contour. When installed for other uses, such as perimeter control, it should be installed in a way that will not produce concentrated flows. For example, a "J-hook" installation may be appropriate to force runoff to pond and evaporate or infiltrate in multiple areas rather than concentrate and cause erosive conditions parallel to the BMP. Sediment Control Log Functions Erosion Control Moderate Sediment Control Yes Site/Material Management No SC-2 Sediment Control Log (SCL) SCL-2 Urban Drainage and Flood Control District November 2015 Urban Storm Drainage Criteria Manual Volume 3 Although sediment control logs initially allow runoff to flow through the BMP, they can quickly become a barrier and should be installed as if they are impermeable. Design details and notes for sediment control logs are provided in the following details. Sediment logs must be properly installed per the detail to prevent undercutting, bypassing and displacement. When installed on slopes, sediment control logs should be installed along the contours (i.e., perpendicular to flow). Improper installation can lead to poor performance. Be sure that sediment control logs are properly trenched (if lighter than 8 lb/foot), anchored and tightly jointed. Maintenance and Removal Be aware that sediment control logs will eventually degrade. Remove accumulated sediment before the depth is one-half the height of the sediment log and repair damage to the sediment log, typically by replacing the damaged section. Once the upstream area is stabilized, remove and properly dispose of the logs. Areas disturbed beneath the logs may need to be seeded and mulched. Sediment control logs that are biodegradable may occasionally be left in place (e.g., when logs are used in conjunction with erosion control blankets as permanent slope breaks). However, removal of sediment control logs after final stabilization is typically appropriate when used in perimeter control, inlet protection and check dam applications. Compost from compost sediment control logs may be spread over the area and seeded as long as this does not cover newly established vegetation. Sediment Control Log (SCL) SC-2 November 2015 Urban Drainage and Flood Control District SCL-3 Urban Storm Drainage Criteria Manual Volume 3 SC-2 Sediment Control Log (SCL) SCL-4 Urban Drainage and Flood Control District November 2015 Urban Storm Drainage Criteria Manual Volume 3 Sediment Control Log (SCL) SC-2 November 2015 Urban Drainage and Flood Control District SCL-5 Urban Storm Drainage Criteria Manual Volume 3 SC-2 Sediment Control Log (SCL) SCL-6 Urban Drainage and Flood Control District November 2015 Urban Storm Drainage Criteria Manual Volume 3 Stockpile Management (SP) MM-2 November 2010 Urban Drainage and Flood Control District SP-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph SP-1. A topsoil stockpile that has been partially revegetated and is protected by silt fence perimeter control. Description Stockpile management includes measures to minimize erosion and sediment transport from soil stockpiles. Appropriate Uses Stockpile management should be used when soils or other erodible materials are stored at the construction site. Special attention should be given to stockpiles in close proximity to natural or manmade storm systems. Design and Installation Locate stockpiles away from all drainage system components including storm sewer inlets. Where practical, choose stockpile locations that that will remain undisturbed for the longest period of time as the phases of construction progress. Place sediment control BMPs around the perimeter of the stockpile, such as sediment control logs, rock socks, silt fence, straw bales and sand bags. See Detail SP-1 for guidance on proper establishment of perimeter controls around a stockpile. For stockpiles in active use, provide a stabilized designated access point on the upgradient side of the stockpile. Stabilize the stockpile surface with surface roughening, temporary seeding and mulching, erosion control blankets, or soil binders. Soils stockpiled for an extended period (typically for more than 60 days) should be seeded and mulched with a temporary grass cover once the stockpile is placed (typically within 14 days). Use of mulch only or a soil binder is acceptable if the stockpile will be in place for a more limited time period (typically 30-60 days). Timeframes for stabilization of stockpiles noted in this fact sheet are "typical" guidelines. Check permit requirements for specific federal, state, and/or local requirements that may be more prescriptive. Stockpiles should not be placed in streets or paved areas unless no other practical alternative exists. See the Stabilized Staging Area Fact Sheet for guidance when staging in roadways is unavoidable due to space or right-of-way constraints. For paved areas, rock socks must be used for perimeter control and all inlets with the potential to receive sediment from the stockpile (even from vehicle tracking) must be protected. Maintenance and Removal Inspect perimeter controls and inlet protection in accordance with their respective BMP Fact Sheets. Where seeding, mulch and/or soil binders are used, reseeding or reapplication of soil binder may be necessary. When temporary removal of a perimeter BMP is necessary to access a stockpile, ensure BMPs are reinstalled in accordance with their respective design detail section. Stockpile Management Functions Erosion Control Yes Sediment Control Yes Site/Material Management Yes MM-2 Stockpile Management (SM) SP-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 When the stockpile is no longer needed, properly dispose of excess materials and revegetate or otherwise stabilize the ground surface where the stockpile was located. Stockpile Management (SP) MM-2 November 2010 Urban Drainage and Flood Control District SP-3 Urban Storm Drainage Criteria Manual Volume 3 MM-2 Stockpile Management (SM) SP-4 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Stockpile Management (SP) MM-2 November 2010 Urban Drainage and Flood Control District SP-5 Urban Storm Drainage Criteria Manual Volume 3 MM-2 Stockpile Management (SM) SP-6 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Street Sweeping and Cleaning S-11 November 2010 Urban Drainage and Flood Control District SWC-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph SSC-1. Monthly street sweeping from April through November removed nearly 40,690 cubic yards of sediment/debris from Denver streets in 2009. Photo courtesy of Denver Public Works. Description Street sweeping uses mechanical pavement cleaning practices to reduce sediment, litter and other debris washed into storm sewers by runoff. This can reduce pollutant loading to receiving waters and in some cases reduce clogging of storm sewers and prolong the life of infiltration oriented BMPs and reduce clogging of outlet structures in detention BMPs. Different designs are available with typical sweepers categorized as a broom and conveyor belt sweeper, wet or dry vacuum-assisted sweepers, and regenerative-air sweepers. The effectiveness of street sweeping is dependent upon particle loadings in the area being swept, street texture, moisture conditions, parked car management, equipment operating conditions and frequency of cleaning (Pitt et al. 2004). Appropriate Uses Street sweeping is an appropriate technique in urban areas where sediment and litter accumulation on streets is of concern for aesthetic, sanitary, water quality, and air quality reasons. From a pollutant loading perspective, street cleaning equipment can be most effective in areas where the surface to be cleaned is the major source of contaminants. These areas include freeways, large commercial parking lots, and paved storage areas (Pitt et al. 2004). Where significant sediment accumulation occurs on pervious surfaces tributary to infiltration BMPs, street sweeping may help to reduce clogging of infiltration media. In areas where construction activity is occurring, street sweeping should occur as part of construction site stormwater management plans. Vacuuming of permeable pavement systems is also considered a basic routine maintenance practice to maintain the BMP in effective operating condition. See the maintenance chapter for more information on permeable pavement systems. Not all sweepers are appropriate for this application. Practice Guidelines 1 1. Post street sweeping schedules with signs and on local government websites so that cars are not parked on the street during designated sweeping days. 2. Sweeping frequency is dependent on local government budget, staffing, and equipment availability, but monthly sweeping during non-winter months is a common approach in the metro Denver urban 1 Practice guidelines adapted from CASQA (2003) California Stormwater BMP Handbook, Practice SC-70 Road and Street Maintenance. Protection of Existing Vegetation (PV) SM-2 November 2010 Urban Drainage and Flood Control District PV-1 Urban Storm Drainage Criteria Manual Volume 3 Photograph PV-1. Protection of existing vegetation and a sensitive area. Photo courtesy of CDOT. Description Protection of existing vegetation on a construction site can be accomplished through installation of a construction fence around the area requiring protection. In cases where upgradient areas are disturbed, it may also be necessary to install perimeter controls to minimize sediment loading to sensitive areas such as wetlands. Existing vegetation may be designated for protection to maintain a stable surface cover as part of construction phasing, or vegetation may be protected in areas designated to remain in natural condition under post-development conditions (e.g., wetlands, mature trees, riparian areas, open space). Appropriate Uses Existing vegetation should be preserved for the maximum practical duration on a construction site through the use of effective construction phasing. Preserving vegetation helps to minimize erosion and can reduce revegetation costs following construction. Protection of wetland areas is required under the Clean Water Act, unless a permit has been obtained from the U.S. Army Corps of Engineers (USACE) allowing impacts in limited areas. If trees are to be protected as part of post-development landscaping, care must be taken to avoid several types of damage, some of which may not be apparent at the time of injury. Potential sources of injury include soil compaction during grading or due to construction traffic, direct equipment-related injury such as bark removal, branch breakage, surface grading and trenching, and soil cut and fill. In order to minimize injuries that may lead to immediate or later death of the tree, tree protection zones should be developed during site design, implemented at the beginning of a construction project, as well as continued during active construction. Design and Installation General Once an area has been designated as a preservation area, there should be no construction activity allowed within a set distance of the area. Clearly mark the area with construction fencing. Do not allow stockpiles, equipment, trailers or parking within the protected area. Guidelines to protect various types of existing vegetation follow. Protection of Existing Vegetation Functions Erosion Control Yes Sediment Control Moderate Site/Material Management Yes SM-2 Protection of Existing Vegetation (PV) PV-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Surface Cover During Phased Construction Install construction fencing or other perimeter controls around areas to be protected from clearing and grading as part of construction phasing. Maintaining surface cover on steep slopes for the maximum practical duration during construction is recommended. Open Space Preservation Where natural open space areas will be preserved as part of a development, it is important to install construction fencing around these areas to protect them from compaction. This is particularly important when areas with soils with high infiltration rates are preserved as part of LID designs. Preserved open space areas should not be used for staging and equipment storage. Wetlands and Riparian Areas Install a construction fence around the perimeter of the wetland or riparian (streamside vegetation) area to prevent access by equipment. In areas downgradient of disturbed areas, install a perimeter control such as silt fence, sediment control logs, or similar measure to minimize sediment loading to the wetland. Tree Protection 1  Before beginning construction operations, establish a tree protection zone around trees to be preserved by installing construction fences. Allow enough space from the trunk to protect the root zone from soil compaction and mechanical damage, and the branches from mechanical damage (see Table PV-1). If low branches will be kept, place the fence outside of the drip line. Where this is not possible, place fencing as far away from the trunk as possible. In order to maintain a healthy tree, be aware that about 60 percent of the tree's root zone extends beyond the drip line. Table PV-1 Guidelines for Determining the Tree Protection Zone (Source: Matheny and Clark, 1998; as cited in GreenCO and WWE 2008) Distance from Trunk (ft) per inch of DBH Species Tolerance to Damage Young Mature Over mature Good 0.5' 0.75' 1.0' Moderate 0.75' 1.0' 1.25' Poor 1.0' 1.25' 1.5' Notes: DBH = diameter at breast height (4.5 ft above grade); Young = <20% of life expectancy; Mature = 20%-80% of life expectancy; Over mature =>80% of life expectancy  Most tree roots grow within the top 12 to 18 inches of soil. Grade changes within the tree protection zone should be avoided where possible because seemingly minor grade changes can either smother 1 Tree Protection guidelines adapted from GreenCO and WWE (2008). Green Industry Best Management Practices (BMPs) for the Conservation and Protection of Water Resources in Colorado: Moving Toward Sustainability, Third Release. See www.greenco.org for more detailed guidance on tree preservation. Protection of Existing Vegetation (PV) SM-2 November 2010 Urban Drainage and Flood Control District PV-3 Urban Storm Drainage Criteria Manual Volume 3 roots (in fill situations) or damage roots (in cut situations). Consider small walls where needed to avoid grade changes in the tree protection zone.  Place and maintain a layer of mulch 4 to 6-inch thick from the tree trunk to the fencing, keeping a 6-inch space between the mulch and the trunk. Mulch helps to preserve moisture and decrease soil compaction if construction traffic is unavoidable. When planting operations are completed, the mulch may be reused throughout planting areas.  Limit access, if needed at all, and appoint one route as the main entrance and exit to the tree protection zone. Within the tree protection zone, do not allow any equipment to be stored, chemicals to be dumped, or construction activities to take place except fine grading, irrigation system installation, and planting operations. These activities should be conducted in consultation with a landscaping professional, following Green Industry BMPs.  Be aware that soil compaction can cause extreme damage to tree health that may appear gradually over a period of years. Soil compaction is easier to prevent than repair. Maintenance and Removal Repair or replace damaged or displaced fencing or other protective barriers around the vegetated area. If damage occurs to a tree, consult an arborist for guidance on how to care for the tree. If a tree in a designated preservation area is damaged beyond repair, remove and replace with a 2-inch diameter tree of the same or similar species. Construction equipment must not enter a wetland area, except as permitted by the U.S. Army Corps of Engineers (USACE). Inadvertent placement of fill in a wetland is a 404 permit violation and will require notification of the USACE. If damage to vegetation occurs in a protected area, reseed the area with the same or similar species, following the recommendations in the USDCM Revegetation chapter. S-11 Street Sweeping and Cleaning SWC-2 Urban Drainage and Flood Control District November 2010 Urban Storm Drainage Criteria Manual Volume 3 Changes in Street Sweeper Technology (Source: Center for Watershed Protection 2002) At one time, street sweepers were thought to have great potential to remove stormwater pollutants from urban street surfaces and were widely touted as a stormwater treatment practice in many communities. Street sweeping gradually fell out of favor, largely as a result of performance monitoring conducted as part of the National Urban Runoff Program (NURP). These studies generally concluded that street sweepers were not very effective in reducing pollutant loads (USEPA, 1983). The primary reason for the mediocre performance was that mechanical sweepers of that era were unable to pick up fine-grained sediment particles that carry a substantial portion of the stormwater pollutant load. In addition, the performance of sweepers is constrained by that portion of a street’s stormwater pollutant load delivered from outside street pavements (e.g., pollutants that wash onto the street from adjacent areas or are directly deposited on the street by rainfall). Street sweeping technology, however, has evolved considerably since the days of the NURP testing. Today, communities have a choice in three basic sweeping technologies to clean their urban streets: traditional mechanical sweepers that utilize a broom and conveyor belt, vacuum-assisted sweepers, and regenerative-air sweepers (those that blast air onto the pavement to loosen sediment particles and vacuum them into a hopper). For more information, see http://www.cwp.org/Resource_Library/Center_Docs/PWP/ELC_PWP121.pdf area. Consider increasing sweeping frequency based on factors such as traffic volume, land use, field observations of sediment and trash accumulation, proximity to watercourses, etc. For example:  Increase the sweeping frequency for streets with high pollutant loadings, especially in high traffic and industrial areas.  Conduct street sweeping prior to wetter seasons to remove accumulated sediments.  Increase the sweeping frequency for streets in special problem areas such as special events, high litter or erosion zones. 3. Perform street cleaning during dry weather if possible. 4. Avoid wet cleaning the street; instead, utilize dry methods where possible. 5. Maintain cleaning equipment in good working condition and purchase replacement equipment as needed. Old sweepers should be replaced with more technologically advanced sweepers (preferably regenerative air sweepers) that maximize pollutant removal. 6. Operate sweepers at manufacturer recommended optimal speed levels to increase effectiveness. 7. Regularly inspect vehicles and equipment for leaks and repair promptly. 8. Keep accurate logs of the number of curb-miles swept and the amount of waste collected. 9. Dispose of street sweeping debris and dirt at a landfill. 10. Do not store swept material along the side of the street or near a storm drain inlet. CONCRETE WASHOUT AREACWA DESCRIPTION: ECO-PAN IS A PROPRIETARY SELF-CONTAINED, WATER-TIGHT CONCRETE WASHOUT WITH FORK CHANNELS AND EYELETS FOR PORTABILITY. THE PAN CAPTURES AND CONTAINS CONCRETE WASTEWATER AND WASHOUT MATERIAL. MAINTENANCE: INSPECT AND CLEAN OUT WHEN 3/4 FULL, NOT ALLOWING THE ECO-PAN TO OVERFLOW. INSPECT WASTEWATER LEVEL, REQUEST SERVICE, AND REPLACE WITH EMPTY ECO-PAN AS NEEDED. INSPECT ECO-PANS TO ENSURE THAT PROPER HOUSEKEEPING PROCEDURES ARE UTILIZED WHEN WASHING OUT EQUIPMENT. ADDITIONAL NOTES: 1. ECO-PAN IS AN ALTERNATIVE TO AN ON-SITE CONSTRUCTED CONCRETE WASHOUT. 2. CONTRACTOR TO CHOOSE PAN SIZE BASED ON PROJECT NEEDS. 3. ALL WASHOUT WATER AND CONCRETE WILL BE DISPOSED OF PROPERLY. 4. ECO-PAN TO BE USED PER MANUFACTURER'S RECOMMENDATIONS. 5. ALTERNATIVE CONCRETE WASHOUT CONTAINMENT SYSTEM MAY BE USED IF APPROVED BY XCEL ENERGY. 2.35 YARD / 5 TON CAPACITY 1.5 YARD / 3 TON CAPACITY WATERBAR DESCRIPTION WATER BAR TO BE INSTALLED ALONG DIRT ROAD WHERE ACCESS GRADING IS NECESSARY WHEN THE ROAD WILL COLLECT AND CARRY RUNOFF FROM THE ADJOING TOPOGRAPHY. WATER BARS CAN BE USED WHERE INTERMITTENT OR PERMANENT STREAMS CROSS ROADWAYS. DEPENDING ON THE METHOD USED, DRAINAGE STRUCTURES SHOULD BE INSTALLED DURING OR AFTER BASIC ROAD CONSTRUCTION. IN UNDULATING OR MOUNTAINOUS TERRAIN, WATER BARS SHALL BE USED TO CONTROL EROSIONS. DESIGN SPECIFICATIONS WATER BARS SHOULD BE INSTALLED AT AN APPROXIMATE 30° ANGLE DOWNSLOPE. THE OUTFLOW END OF THE WATER BAR SHOULD PREVENT WATER FROM ACCUMULATING AND SHOULD NOT FLOW DIRECTLY INTO A STREAM. THIS WILL ALLOW SEDIMENT TO SETTLE OUT OF THE WATER, PREVENTING EROSION. INSTALLATION GENERALLY, WATER BARS TO BE INSTALLED EVERY 5 FEET OF VERTICAL DROP WITH A MINIMUM SPACING OF 100 LINEAL FEET AND MAXIMUM SPACING OF 300 LINEAL FEET. PLAN VIEW PROFILE VIEW LINEAL ROCK CHECK PLACE WATER BAR SO IT DOES NOT DIRECT WATER INTO FILL MATERIAL SLOPES SHOWN ARE GIVEN AS GUIDELINES AND DISTANCES NEED TO BE CONFIRMED AND ADJUSTED BASED ON SITE CONDITIONS. Memo Date: Tuesday, July 26, 2022 Project: Xcel T-Line: 6670 Phase 1 DEBE to UNA Rebuild To: SWMP Binder, Control Measure Details From: Brian Brown, PE - HDR Subject: When to use Vegetation & Topography (VT) instead of structural erosion Control Measures (CM) This memo describes the specific conditions for which the installation of an erosion Control Measure (CM) is not recommended based on site conditions. Under certain conditions, not installing a CM may be the best approach to minimize sediment transport off site. This is based on the concept that shallow overland flow may pick-up and transport sediment that is then dropped out within a vegetative buffer depending on a variety of site conditions. Use of VT instead of a structural CM is dependent on the following factors: • Rainfall – Rainfall intensity impacts the buffer distance. The rainfall rate across the site has been calculated to be calculated 0.57” in a 5-year, 30-minute storm. A 0.75” 5-year, 30-minute storm was utilized for model inputs. This rainfall depth is incorporated in the Table 1 distances. • 80% sediment removal – structural CMs target 80% sediment removal. Actual removal rates vry but have been shown to be less than 80% in many studies. The 80% removal rate is one basis for the VT buffer distances reported in Table 1. • Disturbance area does not have concentrated flow – This approach is based on sediment dropping out while suspended in an overland sheet flow condition. If there is concentrated flow prior to or due to construction, i.e. rill erosion across the work/disturbance area that continues down-gradient and off-site, then structural CMs are recommended. • Low slope – local slope of the site impacts velocity, flow concentration, and other factors. Use VT should not be considered for slopes exceeding 10%. • Soil Type – Soil type impacts likelihood of soil being transported in sheet flow. The larger the soil particles, i.e. sand, the harder to pick-up and transport. The smaller the particle, i.e. clay, the longer the transport distance. The NRCS predominant Hydrologic Soil Group (HSG) soil types for the project area are A and B. The hydrologic soil groups (HSG) are A – D and as follows: o A – sand or silty sand, High infiltration rate o B – sandy silt, moderately high infiltration rate o C – clayey silt, moderate to low infiltration rate o D – clay, low infiltration rate • Vegetation cover – The vegetation cover (surface roughness) was accounted for in the VT model runs and found to provide similar buffer distances, therefore the most conservative vegetation density is reflected in Table 1. • Vegetation Buffer - The buffer distance measurement is along the flow direction, and measured from the limit of the work zone to the limit of the utility easement/ROW. Vegetation buffer outside of the ROW may not be utilized for the required buffer distance. Due to the project area, there is adequate area for sediment settling on-site. • The use of this VT approach may be applied to linear and larger area disturbances that meet the parameters described in this memo. • Table 1 results below include a 15% buffer beyond calculated model buffer distances. Utilize Table 1 below for VT buffer distances: VT Buffer Soil Buffer Distance (ft) A 3 B 8 C 26 D 52 Maintenance: In the same manner that using existing conditions as a CM does not require installation of a CM, there is no maintenance of this CM. VT is either adequate or structural CMs should be installed. Inspection: Like structural CMs, the area down gradient of a VT CM should be walked and observed for the following which indicate that VT may not be adequate: • signs of new rill erosion in work area or immediately down gradient of work area • signs of sediment deposition well beyond the expected buffer distance or nearing area not controlled by Xcel property lease • observations of work area or up gradient areas that are creating concentrated flow through and down gradient of the work area. • Observe and discuss with contractor potential construction practices that could promote sheet flow and infiltration to minimize stormwater runoff from work area. In the event that VT is inadequate to keep sediment on site at any local area, that local area must immediately have a structural down gradient CM installed, at a minimum. Sediment Control Log is the expected control measure. Site conditions will dictate actual CM to be used. CALL UTILITY NOTIFICATION CENTER OF COLORADO (UNCC) AT 811 BEFORE DIGGING. ALLOW MINIMUM 48-HOURS FOR UTILITY LOCATION SERVICES. REV DATE PROJ. No.REVISION DESCRIPTION DWN DSN ENG CHK FILM FILE NAME SCALE SHEET No.MICROFILM No. SIZE DWG No.REV 50 13 139 50 70 70 Curecanti National Recreation Area Uncompahgre National Forest Dinosaur National Monument Grand Junction 50 San Isabel National Forest Routt National Forest Roosevelt National Forest Arapaho National Forest 70 Una De Beque Project Area 0 40 8020 MILES 0 1.5 30.75 Miles Project Area SHEET INDEX SWMP SITE MAP 1 COVER SHEET 2 NOTES, KEY MAP & LEGEND 3 ACCESS ROAD OVERVIEW 4-11 SWMP DRAWINGS* 12-22 SWMP DRAWINGS CDOT EROSION CONTROL MEASURE DETAILS 1-11 TEMPORARY EROSION CONTROL 12-13 SOIL RETENTION COVERING * GARFIELD COUNTY SUBMITTAL. MESA COUNTY SHEETS SHOWN IN GREY AND ARE NOT PART OF THIS PLAN SET. MESA COUNTY SHEETS WILL BE INCLUDED IN OVERALL SWMP BINDER AS PART OF STATE SWMP PERMIT REQUIREMENTS. XCEL ENERGY PROJECT MANAGER, TRANSMISSION : BRYAN COOLEY 1800 LARIMER ST DENVER, CO 80202 PHONE: 512-585-0449 HDR SWMP PREPARER: BRIAN BROWN PE 419 CANYON AVE SUITE 316 FORT COLLINS CO, 80521 PHONE: 970-416-4404 1 8/25/22 10341854 ESC PLANS 1 6670 N.T.S 1 XCEL TRANSMISSION LINE 6670 PHASE 1 DE BEQUE TO UNA SUBSTATION REBUILD CONSTRUCTION STORMWATER MANAGEMENT PLAN (SWMP) XCEL 6670 REBUILD PH 1 DE BEQUE TO UNA SUBSTATION COVER SHEET SEPTEMBER 2022 THE LINE REBUILD IS PART OF A LARGER LINE REBUILD BETWEEN DE BEQUE TO RIFLE. PHASE 1 WORK EXTENDS FROM THE DE BEQUE SUBSTATION TO THE UNA SUBSTATION AND IS CALLED PHASE 1 DE BEQUE TO UNA. 9S 97W 9S 96W 8S 97W 8S 96W 7S 96W 7S 97W MB-2 MB-4 MB-6 MB-8 MB-10 MB-12 MB-14 MB-16 MB-18 MB-1 MB-3 MB-5 MB-7 MB-9 MB-11 MB-13 MB-15 MB-17 MB-19 DEBEQUE US Hwy 6I- 70GARFIELD COUNTY MESA COUNTY GENERAL NOTES STAGING YARD PULL SITE MINIMAL FLOOD RISK EASEMENT CULVERT COUNTY BOUNDARY BUREAU OF LAND MANAGEMENT (BLM) STREAMS CDOT PERMAMENT ACCESS ACCESS MINOR CONTOUR - 2' MAJOR CONTOUR - 10' REMOVAL LINE ALIGNMENT REMOVE STRUCTURE! INSTALL STRUCTURE! Access Point REV DATE PROJ. No.REVISION DESCRIPTION DWN DSN ENG CHK FILM FILE NAME SCALE SHEET No.MICROFILM No. SIZE DWG No.REV FEATURE LEGEND APPLIES TO SUBSEQUENT SHEETS. 2 6670 N.T.S GENERAL NOTES 1. NON-COMPLIANCE AND ANY NOTICE OF VIOLATION IS THE RESPONSIBILITY OF THE PERMITEE. 2. SEDIMENT (MUD AND DIRT) TRANSPORTED ONTO A PAVED ROAD, REGARDLESS OF THE SIZE OF THE SITE, SHALL BE REMOVED AND PROPERLY DISPOSED OF IMMEDIATELY. 3. THIS PLAN CONTAINS SOIL EROSION AND SEDIMENT CONTROL METHODS TO BE USED DURING CONSTRUCTION; ADDITIONAL MEASURES MAY BE REQUIRED AS CONDITIONS CHANGE. IT IS THE CONTRACTOR’S RESPONSIBILITY TO ENSURE COMPLAINCE WITH FEDERAL, STATE, AND LOCAL REQUIREMENTS. 4. ALL CONTROL MEASURES (CMs) ARE TO BE MAINTAINED PER THE SPECIFICATIONS NOTED IN THIS PLAN, IF ANY SUBSTANTIAL DEVIATION FROM INSTALLATION/IMPLEMENTATION SPECIFICATIONS MAY BETTER SUIT A PARTICULAR APPLICATION, CONTACT THE QUALIFIED STORMWATER MANAGER FOR APPROVAL AND UPDATE THE SWMP ACCORDINGLY. 5. SOILS EXPOSED BY LAND DISTURBING ACTIVITIES ON SLOPES SHALL BE KEPT IN A ROUGHENED CONDITION BY RIPPING ALONG CONTOUR TO PREVENT EROSION. TECHNIQUES SUCH AS SURFACE ROUGHENING SHALL BE USED TO MINIMIZE WIND EROSION. 6. SOIL EROSION CONTROL MEASURES FOR ALL SLOPES, CHANNELS, DITCHES, OR ANY DISTURBED LAND AREA SHALL BE COMPLETED WITHIN FOURTEEN (14) CALENDAR DAYS FOR INACTIVE AREAS OR AFTER FINAL GRADING OR FINAL EARTH DISTURBANCE HAS BEEN COMPLETED. 7. LIMITS OF CONSTRUCTION INCLUDE ALL PULL SITES, STAGING YARDS, ACCESS ROADS, AND EXISITING AND PROPOSED ALIGNMENTS. 8. A CONCRETE WASHOUT (CWA) WILL BE LOCATED AT ANY WORK AREAS WHERE CONCRETE WILL BE POURED. 9. CONCRETE WASH WATER SHALL NOT BE ALLOWED TO RUNOFF TO STATE WATERS, INCLUDING GROUNDWATER AND ANY SURFACE OR SUBSURFACE STORM DRAINAGE SYSTEM OF FACILITIES. CONCRETE WASH WATER, AND WASTEWATER USED IN RINSING TOOLS SHALL BE COLLECTED IN AN APPROVED WASH OUT AREA, REMOVED REGULARLY, AND DISPOSED OF APPROPRIATELY. 10. IF ACCESS IMPROVEMENTS REQUIRE GROUND DISTURBANCE, CONTRACTOR TO INSTALL DOWN-GRADIENT CONTROL MEASURES ALONG DISTURBANCE. 11. SEDIMENT CONTROL LOG (SCL) AND PORTABLE SEDIMENT CONTROL LOG (PSCL) OR SIMILAR PRODUCTS MAY BE USED INTERCHANGEABLY AT THE DISCRETION OF THE CONTRACTOR. 12. REFER TO VEGETATION TOPOGRAPHY (VT) DETAIL FOR INFORMATION REGARDING REQUIRED BUFFER DISTANCES FOR USE OF VT IN LIEU OF STRUCTURAL CM. IF VT BECOMES INADEQUATE OR FLOWS BECOME CONCENTRATE UTILIZE SCL OR SIMILIAR CM. 12. VEHICLE TRACKING CONTROL (VTC) IS A PROPRIETARY PRODUCT THAT LAYS ON THE GROUND (I.E. VTRAX, FOD, TRACKING CONTROL). 13. CONSTRUCTION WILL PROGRESS LINEARLY, CMs TO BE IMPLEMENTED PER CONSTRUCTION PHASE AT EACH DISCRETE LOCATION. 14. DEPLOY CWA, PORTABLE TOILETS, SOLID WASTE DUMPSTERS, STOCKPILES, ETC. AS NECESSARY AND UPDATE SITE MAPS WITH LOCATOINS ACCORDINGLY 15. FOLLOWING CONSTRUCTION ACTIVITIES ALL AREAS OF DISTURBANCE REQUIRE STABILIZATION BY SEED AND MULCH UNLESS THE FUNCTION OF SUCH AREAS IS TO REMAIN DISTURBED (I.E. ACCESS ROADS). THE SITE WILL BE CONSIDERED FULLY STABILIZED WHEN VEGETATION REACHES A MINIMUM OF 70% OF PRE-DISTRUBANCE DENSITIES, AS DISCUSSED IN THE SWMP REPORT NARRATIVE. 16. FINAL CMs MUST REMAIN IN PLACE UNTIL SURROUNDING & UPGRADIENT AREAS HAVE REACHED FINAL STABILIZATION. 17. STABILIZE ALL DISTURBED AREAS DUE TO REMOVAL OF CMs. ALL TEMPORARY CMs MUST BE REMOVED FROM THE CONSTRUCTION SITE AND PROPERLY DISPOSED OF ONCE FINAL STABILIZATION IS ACHIEVED. XCEL 6670 REBUILD PH 1 DE BEQUE TO UNA SUBSTATION NOTES, KEY MAP & LEGEND SEPTEMBER 2022 REV DATE PROJ. No.REVISION DESCRIPTION DWN DSN ENG CHK FILM FILE NAME SCALE SHEET No.MICROFILM No. SIZE DWG No.REV 8S 97W 8S 96W 7S 96W 7S 97W DEBEQUE I- 70GARFIELD COUNTY MESA COUNTY 39.33394984, -108.20989458 39.33617851, -108.20474394 39.33887148, -108.20201472 39.34566751, -108.19545044 39.34366784, -108.19696406 39.34284651, -108.19761114 39.34729467, -108.19272694 39.3493823, -108.19156939 39.35327205, -108.18510646 39.35529539, -108.1802359 39.35597607, -108.17752469 39.36015925, -108.16920681 39.37102504, -108.16673989 39.3790492, -108.14881802 39.39312414, -108.12183877 39.39526523, -108.11855349 39.39422, -108.11745155 39.35559572, -108.16834425 39.38467509, -108.13820426 39.39732079, -108.11458018 !!!!!!!!!!! !!!!!!!!!!! !!!!!!!!!!! !!!!!!!!!!! !!!!!!!!!!! !!!!!!!!!!! !!!!!!!!!!! ACCESS ROAD OVERVIEW ACCESS POINT ACCESS1.4 miles1 mile1 mile3 6670 N.T.S 1 1 8/25/22 10341854 ESC PLANS XCEL 6670 REBUILD PH 1 DE BEQUE TO UNA SUBSTATION ACCESS ROAD OVERVIEW ! ! ! ! ! ! ! ! ! ! ! ! ! 5250 5240 5230 5220 5210 5200 5190 5180 5170 5160 5150514051205110 5230 5220 5210 5210 5200 5110 5100 5090 52505240524052305130 5100 524051905260 5 2 2 0 52006670-34 6670-35 6670-36 6670-37 6670-38GARFIELD COUNTY MESA COUNTY 430 429 428 427 426 424 423 425 XCEL 6670 REBUILD PHASE 1: DEBEQUE SUBSTATION TO UNA SUBSTATION © 2022 Microsoft Corporation © 2022 Maxar ©CNES (2022) Distribution Airbus DS 0 75 150 Feet NOTES 1. CONTRACTOR TO KEEP WITHIN PRE-DEFINED CONSTRUCTION LIMITS. INSTALL CONSTRUCTION FENCE (CF) AT CONSTRUCTION LIMITS IF NEEDED TO CONFINE CONSTRUCTION CREWS & EQUIPMENT. 2. FLOW DIRECTION SHOWN WHERE SURFACE FLOW DIRECTION IS DISCERNIBLE GIVEN TOPOGRAPHY. SWMP INSPECTOR TO UPDATE FLOW DIRECTIONS ON MAP IN FIELD. 4. TOPOGRAPHY BASED ON USGS 2 METER DEM. TOPOGRAPHIC LINES ARE APPROXIMATE. 5. INSTALL DOWN-GRADIENT CONTROL MEASURES (CMs) FOR ALL STOCKPILES AT ALL LOCATIONS REGARDLESS OF CM DESIGNATION. 6. REFER TO VT DETAIL FOR INFORMATION REGARDING REQUIRED BUFFER DISTANCES FOR USE OF VT IN LIEU OF STRUCTURAL CM. 7. PORTABLE SEDIMENT CONTROL LOG (PSCL) TO BE PLACED ON DOWN-GRADIENT SIDE OF DISTURBANCE. 8. INITIAL PHASE CMs MUST BE INSTALLED BEFORE GROUND DISTURBING ACTIVITIES MAY COMMENCE IN THAT AREA. INTERIM CMs REQUIRED WHILE CONSTRUCTION IS ACTIVE IN THE AREA. FINAL CMs MUST REMAIN IN PLACE UNTIL UPGRADIENT AREAS HAVE REACHED FINAL STABILIZATION. 9. CMs LABELED "INITIAL, INTERIM" TO BE REMOVED PRIOR TO IMPLEMENTATION OF FINAL STABILIZATION. ALL OTHER CMs TO REMAIN IN PLACE UNTIL FINAL STABILIZATION OF SURROUNDING AND UP-GRADIENT AREAS HAVE BEEN ACHIEVED. 10. CONTRACTOR MUST RESTORE ALL DISTURBED AREAS DUE TO CONSTRUCTION AND REMOVAL OF CMs WITH SEED AND MULCH. INSTALL SCL ON DOWN-GRADIENT TOE OF FILL SLOPES IF GROUND DISTURBANCE OCCURS WITHIN EASEMENT. PH 1 DE BEQUE TO UNA SUBSTATION SWMP DRAWINGS SH 12 PSCL ~ 40 LF PSCL PSCL PSCL PSCL V T V T V T V T V T V T V T V T SCL ~715 LF EXISTING ACCESS. NO GRADING. ~ 40 LF ~ 20 LF ~ 20 LF~ 20 LF IMPROVE EXISTING ACCESS. MAX 2' CUT/FILL. INSTALL SCL ON DOWN-GRADIENT OF CUT OR FILL. INSTALL WATERBAR APPROXIMATELY EVERY 5 VERTICAL FT ALONG ACCESS GRADING. INTERSECTION WITH PAVED ROAD ~0.2 MI NORTH. INSTALL TRACKING CONTROL WHERE ACCESS MEETS HWY 6. PERFORM STREET SWEEPING IMMEDIATELY IF TRACKOUT OCCURS. EXISTING ACCESS. NO GRADING. LOD PRESCRIPTIVE USE IF RUTTING IS LIKELY TO OCCUR IN DRAINAGE CROSSING INSTALL MATS, BRIDGING, OR SIMILAR CM TO MINIMIZE RUTTING AND SEDIMENT TRANSPORT. SCL~ 88 LF SCL ~ 65 LF CONTROL MEASURE LEGEND PSCL SCL V T S S VTC SEDIMENT CONTROL LOG PORTABLE SEDIMENT CONTROL LOG VEGETATION TOPOGRAPHY STREET SWEEPING VEHICLE TRACKING CONTROL FLOW DIRECTION SEPTEMBER 2022 ! !!!! !!!5240523052205210520051905 1 8 0 517 0 5 1 6 0 51 5 0 514 0 513 0 51 2 0 511 0 51 7 0 5 1 6 0 5 1 5 0 51 4 0 5130 51205110 5100 50 9 0 5100508050705060505052305220 5210 5090 50805240 510052 2 0 511050406670-39 6670-40 6670-41 GARFIELD COUNTY 419 421422 420 XCEL 6670 REBUILD PHASE 1: DEBEQUE SUBSTATION TO UNA SUBSTATION © 2022 Microsoft Corporation © 2022 Maxar ©CNES (2022) Distribution Airbus DS 0 75 150 Feet NOTES 1. CONTRACTOR TO KEEP WITHIN PRE-DEFINED CONSTRUCTION LIMITS. INSTALL CONSTRUCTION FENCE (CF) AT CONSTRUCTION LIMITS IF NEEDED TO CONFINE CONSTRUCTION CREWS & EQUIPMENT. 2. FLOW DIRECTION SHOWN WHERE SURFACE FLOW DIRECTION IS DISCERNIBLE GIVEN TOPOGRAPHY. SWMP INSPECTOR TO UPDATE FLOW DIRECTIONS ON MAP IN FIELD. 4. TOPOGRAPHY BASED ON USGS 2 METER DEM. TOPOGRAPHIC LINES ARE APPROXIMATE. 5. INSTALL DOWN-GRADIENT CONTROL MEASURES (CMs) FOR ALL STOCKPILES AT ALL LOCATIONS REGARDLESS OF CM DESIGNATION. 6. REFER TO VT DETAIL FOR INFORMATION REGARDING REQUIRED BUFFER DISTANCES FOR USE OF VT IN LIEU OF STRUCTURAL CM. 7. PORTABLE SEDIMENT CONTROL LOG (PSCL) TO BE PLACED ON DOWN-GRADIENT SIDE OF DISTURBANCE. 8. INITIAL PHASE CMs MUST BE INSTALLED BEFORE GROUND DISTURBING ACTIVITIES MAY COMMENCE IN THAT AREA. INTERIM CMs REQUIRED WHILE CONSTRUCTION IS ACTIVE IN THE AREA. FINAL CMs MUST REMAIN IN PLACE UNTIL UPGRADIENT AREAS HAVE REACHED FINAL STABILIZATION. 9. CMs LABELED "INITIAL, INTERIM" TO BE REMOVED PRIOR TO IMPLEMENTATION OF FINAL STABILIZATION. ALL OTHER CMs TO REMAIN IN PLACE UNTIL FINAL STABILIZATION OF SURROUNDING AND UP-GRADIENT AREAS HAVE BEEN ACHIEVED. 10. CONTRACTOR MUST RESTORE ALL DISTURBED AREAS DUE TO CONSTRUCTION AND REMOVAL OF CMs WITH SEED AND MULCH. V T V T V T V T PSCL PSCL PSCL ~ 40 LF ~ 20 LF ~ 20 LF PH 1 DE BEQUE TO UNA SUBSTATION SWMP DRAWINGS SH 13 EXISTING ACCESS. NO GRADING. EXISTING DIRT ACCESS. IF ACCESS IMPROVEMENTS ARE REQUIRED & GROUND DISTURBANCE OCCURS, INSTALL SCL ON DOWN-GRADIENT TOE OF FILL SLOPE. CONTROL MEASURE LEGEND PSCL SCL V T S S VTC SEDIMENT CONTROL LOG PORTABLE SEDIMENT CONTROL LOG VEGETATION TOPOGRAPHY STREET SWEEPING VEHICLE TRACKING CONTROL FLOW DIRECTION SEPTEMBER 2022 SCL~ 50 LF !!! ! !!!!! 5 1 9 0 5 1 8 0 5 1 7 0 5160 5150 51 4 0 5 1 3 0 5 1 2 0 51 1 0 510 0 51405130512051005080507050605050504050305130512051105100509050805150 5140 5130 5120 5110 5170 516051105100509050805070 506 0 50 8 0 5070509051 9 0 51705160 5 1 6 0 514051405 1 2 0 5 1 2 0 6670-42 6670-43 6670-44 6670-45 GARFIELD COUNTY 417 416 415 418 XCEL 6670 REBUILD PHASE 1: DEBEQUE SUBSTATION TO UNA SUBSTATION © 2022 Microsoft Corporation © 2022 Maxar ©CNES (2022) Distribution Airbus DS 0 75 150 Feet NOTES 1. CONTRACTOR TO KEEP WITHIN PRE-DEFINED CONSTRUCTION LIMITS. INSTALL CONSTRUCTION FENCE (CF) AT CONSTRUCTION LIMITS IF NEEDED TO CONFINE CONSTRUCTION CREWS & EQUIPMENT. 2. FLOW DIRECTION SHOWN WHERE SURFACE FLOW DIRECTION IS DISCERNIBLE GIVEN TOPOGRAPHY. SWMP INSPECTOR TO UPDATE FLOW DIRECTIONS ON MAP IN FIELD. 4. TOPOGRAPHY BASED ON USGS 2 METER DEM. TOPOGRAPHIC LINES ARE APPROXIMATE. 5. INSTALL DOWN-GRADIENT CONTROL MEASURES (CMs) FOR ALL STOCKPILES AT ALL LOCATIONS REGARDLESS OF CM DESIGNATION. 6. REFER TO VT DETAIL FOR INFORMATION REGARDING REQUIRED BUFFER DISTANCES FOR USE OF VT IN LIEU OF STRUCTURAL CM. 7. PORTABLE SEDIMENT CONTROL LOG (PSCL) TO BE PLACED ON DOWN-GRADIENT SIDE OF DISTURBANCE. 8. INITIAL PHASE CMs MUST BE INSTALLED BEFORE GROUND DISTURBING ACTIVITIES MAY COMMENCE IN THAT AREA. INTERIM CMs REQUIRED WHILE CONSTRUCTION IS ACTIVE IN THE AREA. FINAL CMs MUST REMAIN IN PLACE UNTIL UPGRADIENT AREAS HAVE REACHED FINAL STABILIZATION. 9. CMs LABELED "INITIAL, INTERIM" TO BE REMOVED PRIOR TO IMPLEMENTATION OF FINAL STABILIZATION. ALL OTHER CMs TO REMAIN IN PLACE UNTIL FINAL STABILIZATION OF SURROUNDING AND UP-GRADIENT AREAS HAVE BEEN ACHIEVED. 10. CONTRACTOR MUST RESTORE ALL DISTURBED AREAS DUE TO CONSTRUCTION AND REMOVAL OF CMs WITH SEED AND MULCH. PSCL PSCL PSCL PSCL V T INSTALL 2 HDPE CULVERTS WITH OUTLET PROTECTION. ESTIMATED 24" DIAMETER. CONTRACTOR TO INSTALL ROCK TO HARDEN DRAINAGE BOTTOM IF SOIL IS SATURATED TO MINIMIZE RUTTING. PH 1 DE BEQUE TO UNA SUBSTATION SWMP DRAWINGS SH 14 ~ 20 LF ~ 40 LF ~ 20 LF ~ 40 LF ~ 40 LF~ 20 LF ~ 40 LF REPAIR EXISITING CULVERT. OUTLET PROTECTION REQUIRED. ACCESS GRADING. MAX 3' CUT/FILL. INSTALL SCL ON DOWN-GRADIENT TOE OF FILL SLOPE FOR ALL DISTURBED AREAS. ESTIMATED LENGTH OF ACCESS GRADING IS ~75% OF THE TOTAL ACCESS LENGTH ~2500 LF REQUIRING ~ 1875 LF OF SCL. PSCL SCL ~1875 LF PSCL PSCL CONTROL MEASURE LEGEND PSCL SCL V T S S VTC SEDIMENT CONTROL LOG PORTABLE SEDIMENT CONTROL LOG VEGETATION TOPOGRAPHY STREET SWEEPING VEHICLE TRACKING CONTROL FLOW DIRECTION SEPTEMBER 2022 ! !!!! !!!!!!!!! US Hwy 6 512051105100509050805060505050405030 5080 507051505140 513050705 Mile Ranch Yard 6670-45 6670-46-DE 6670-47 6670-48 6670-49 GARFIELD COUNTY 39.3790492, -108.14881802 414 413 408410412 411 409 407 XCEL 6670 REBUILD PHASE 1: DEBEQUE SUBSTATION TO UNA SUBSTATION © 2022 Microsoft Corporation © 2022 Maxar ©CNES (2022) Distribution Airbus DS 0 75 150 Feet NOTES 1. CONTRACTOR TO KEEP WITHIN PRE-DEFINED CONSTRUCTION LIMITS. INSTALL CONSTRUCTION FENCE (CF) AT CONSTRUCTION LIMITS IF NEEDED TO CONFINE CONSTRUCTION CREWS & EQUIPMENT. 2. FLOW DIRECTION SHOWN WHERE SURFACE FLOW DIRECTION IS DISCERNIBLE GIVEN TOPOGRAPHY. SWMP INSPECTOR TO UPDATE FLOW DIRECTIONS ON MAP IN FIELD. 4. TOPOGRAPHY BASED ON USGS 2 METER DEM. TOPOGRAPHIC LINES ARE APPROXIMATE. 5. INSTALL DOWN-GRADIENT CONTROL MEASURES (CMs) FOR ALL STOCKPILES AT ALL LOCATIONS REGARDLESS OF CM DESIGNATION. 6. REFER TO VT DETAIL FOR INFORMATION REGARDING REQUIRED BUFFER DISTANCES FOR USE OF VT IN LIEU OF STRUCTURAL CM. 7. PORTABLE SEDIMENT CONTROL LOG (PSCL) TO BE PLACED ON DOWN-GRADIENT SIDE OF DISTURBANCE. 8. INITIAL PHASE CMs MUST BE INSTALLED BEFORE GROUND DISTURBING ACTIVITIES MAY COMMENCE IN THAT AREA. INTERIM CMs REQUIRED WHILE CONSTRUCTION IS ACTIVE IN THE AREA. FINAL CMs MUST REMAIN IN PLACE UNTIL UPGRADIENT AREAS HAVE REACHED FINAL STABILIZATION. 9. CMs LABELED "INITIAL, INTERIM" TO BE REMOVED PRIOR TO IMPLEMENTATION OF FINAL STABILIZATION. ALL OTHER CMs TO REMAIN IN PLACE UNTIL FINAL STABILIZATION OF SURROUNDING AND UP-GRADIENT AREAS HAVE BEEN ACHIEVED. 10. CONTRACTOR MUST RESTORE ALL DISTURBED AREAS DUE TO CONSTRUCTION AND REMOVAL OF CMs WITH SEED AND MULCH. IF RUTTING IS LIKELY TO OCCUR IN DRAINAGE CROSSINGS INSTALL MATS, BRIDGING, OR SIMILAR CM TO MINIMIZE RUTTING AND SEDIMENT TRANSPORT. INSTALL WATERBARS APPROXIMATELY EVERY 5 VERTICAL FT ALONG ACCESS & PULL-SITE GRADING. PSCL PSCL PSCL Initial Interim PSCLPSCL PSCL SCL TO BE ULTILIZED FOR PULL PAD GRADING. SEE DETAIL FOR INSTALLATION & MAINTENANCE NOTES. V T~ 20 LF PSCL V T V T PH 1 DE BEQUE TO UNA SUBSTATION SWMP DRAWINGS S S SH 15 ~ 20 LF ~ 20 LF ~ 20 LF ~ 20 LF ~ 40 LF ~ 20 LF SCL ~ 1300 LF IF RUTTING IS LIKELY TO OCCUR IN DRAINAGE CROSSING INSTALL MATS, TEMPORARY TIMBER BRIDE, OR SIMILAR CM TO MINIMIZE RUTTING AND SEDIMENT TRANSPORT. EXISTING DIRT ACCESS. NO GRADING ANTICIPATED. IF GROUND DISTURBANCE OCCURS, INSTALL SCL ON DOWN-GRADIENT TOE OF FILL SLOPE. EXISTING ACCESS. NO GRADING ANTICIPATED. VTC SEPTEMBER 2022 5-MILE RANCH STAGING AREA CONTROL MEASURE LEGEND PSCL SCL V T S S VTC SEDIMENT CONTROL LOG PORTABLE SEDIMENT CONTROL LOG VEGETATION TOPOGRAPHY STREET SWEEPING VEHICLE TRACKING CONTROL CONCRETE WASHOUT AREA FLOW DIRECTION CWA PSCL ~ 40 LF PSCL V T ~ 20 LF !!!!!!! ! !!!!! US Hwy 6 5070 50605050 50405030 5020 50105060 5070 6670-50 6670-51 6670-52 6670-53 6670-54 GARFIELD COUNTY 39.38467509, -108.13820426 406 404 402403407405 401 400 XCEL 6670 REBUILD PHASE 1: DEBEQUE SUBSTATION TO UNA SUBSTATION © 2022 Microsoft Corporation © 2022 Maxar ©CNES (2022) Distribution Airbus DS 0 75 150 Feet NOTES 1. CONTRACTOR TO KEEP WITHIN PRE-DEFINED CONSTRUCTION LIMITS. INSTALL CONSTRUCTION FENCE (CF) AT CONSTRUCTION LIMITS IF NEEDED TO CONFINE CONSTRUCTION CREWS & EQUIPMENT. 2. FLOW DIRECTION SHOWN WHERE SURFACE FLOW DIRECTION IS DISCERNIBLE GIVEN TOPOGRAPHY. SWMP INSPECTOR TO UPDATE FLOW DIRECTIONS ON MAP IN FIELD. 4. TOPOGRAPHY BASED ON USGS 2 METER DEM. TOPOGRAPHIC LINES ARE APPROXIMATE. 5. INSTALL DOWN-GRADIENT CONTROL MEASURES (CMs) FOR ALL STOCKPILES AT ALL LOCATIONS REGARDLESS OF CM DESIGNATION. 6. REFER TO VT DETAIL FOR INFORMATION REGARDING REQUIRED BUFFER DISTANCES FOR USE OF VT IN LIEU OF STRUCTURAL CM. 7. PORTABLE SEDIMENT CONTROL LOG (PSCL) TO BE PLACED ON DOWN-GRADIENT SIDE OF DISTURBANCE. 8. INITIAL PHASE CMs MUST BE INSTALLED BEFORE GROUND DISTURBING ACTIVITIES MAY COMMENCE IN THAT AREA. INTERIM CMs REQUIRED WHILE CONSTRUCTION IS ACTIVE IN THE AREA. FINAL CMs MUST REMAIN IN PLACE UNTIL UPGRADIENT AREAS HAVE REACHED FINAL STABILIZATION. 9. CMs LABELED "INITIAL, INTERIM" TO BE REMOVED PRIOR TO IMPLEMENTATION OF FINAL STABILIZATION. ALL OTHER CMs TO REMAIN IN PLACE UNTIL FINAL STABILIZATION OF SURROUNDING AND UP-GRADIENT AREAS HAVE BEEN ACHIEVED. 10. CONTRACTOR MUST RESTORE ALL DISTURBED AREAS DUE TO CONSTRUCTION AND REMOVAL OF CMs WITH SEED AND MULCH. VTC Initial Interim PSCL PSCL PSCL V T V T V T V T V T V T V T PSCL PSCL PH 1 DE BEQUE TO UNA SUBSTATION SWMP DRAWINGS SH 16 ~ 40 LF ~ 20 LF ~ 40 LF EXISTING ACCESS. NO GRADING. S S ~ 20 LF ~ 20 LF EXISITING CULVERTS EXISTING ACCESS. NO GRADING. CONTROL MEASURE LEGEND PSCL SCL V T S S VTC SEDIMENT CONTROL LOG PORTABLE SEDIMENT CONTROL LOG VEGETATION TOPOGRAPHY STREET SWEEPING VEHICLE TRACKING CONTROL FLOW DIRECTION SEPTEMBER 2022 CONTRACTOR TO INSTALL ROCK TO HARDEN DRAINAGE BOTTOM IF SOIL IS SATURATED TO MINIMIZE RUTTING. ! ! ! ! ! ! ! ! ! ! ! ! US Hwy 6 5050 5040 5030 5020 5010 5080 5070 5060 50 1 0 500 0 50705 0 8 0 5010 5010 COLCLC12b_A6670-55 6670-56 6670-57 6670-58 6670-59GARFIELD COUNTY 399 398 395 396 394400 397 XCEL 6670 REBUILD PHASE 1: DEBEQUE SUBSTATION TO UNA SUBSTATION © 2022 Microsoft Corporation © 2022 Maxar ©CNES (2022) Distribution Airbus DS 0 75 150 Feet NOTES 1. CONTRACTOR TO KEEP WITHIN PRE-DEFINED CONSTRUCTION LIMITS. INSTALL CONSTRUCTION FENCE (CF) AT CONSTRUCTION LIMITS IF NEEDED TO CONFINE CONSTRUCTION CREWS & EQUIPMENT. 2. FLOW DIRECTION SHOWN WHERE SURFACE FLOW DIRECTION IS DISCERNIBLE GIVEN TOPOGRAPHY. SWMP INSPECTOR TO UPDATE FLOW DIRECTIONS ON MAP IN FIELD. 4. TOPOGRAPHY BASED ON USGS 2 METER DEM. TOPOGRAPHIC LINES ARE APPROXIMATE. 5. INSTALL DOWN-GRADIENT CONTROL MEASURES (CMs) FOR ALL STOCKPILES AT ALL LOCATIONS REGARDLESS OF CM DESIGNATION. 6. REFER TO VT DETAIL FOR INFORMATION REGARDING REQUIRED BUFFER DISTANCES FOR USE OF VT IN LIEU OF STRUCTURAL CM. 7. PORTABLE SEDIMENT CONTROL LOG (PSCL) TO BE PLACED ON DOWN-GRADIENT SIDE OF DISTURBANCE. 8. INITIAL PHASE CMs MUST BE INSTALLED BEFORE GROUND DISTURBING ACTIVITIES MAY COMMENCE IN THAT AREA. INTERIM CMs REQUIRED WHILE CONSTRUCTION IS ACTIVE IN THE AREA. FINAL CMs MUST REMAIN IN PLACE UNTIL UPGRADIENT AREAS HAVE REACHED FINAL STABILIZATION. 9. CMs LABELED "INITIAL, INTERIM" TO BE REMOVED PRIOR TO IMPLEMENTATION OF FINAL STABILIZATION. ALL OTHER CMs TO REMAIN IN PLACE UNTIL FINAL STABILIZATION OF SURROUNDING AND UP-GRADIENT AREAS HAVE BEEN ACHIEVED. 10. CONTRACTOR MUST RESTORE ALL DISTURBED AREAS DUE TO CONSTRUCTION AND REMOVAL OF CMs WITH SEED AND MULCH. PSCL PSCL PSCL PSCL PSCL PSCL PSCL PSCL PSCL PSCL PSCL EXISITING BOX CULVERT PH 1 DE BEQUE TO UNA SUBSTATION SWMP DRAWINGS SH 17 ~ 20 LF ~ 20 LF ~ 40 LF ~ 20 LF ~ 40 LF ~ 20 LF ~ 40 LF ~ 20 LF ~ 20 LF ~ 40 LF ~ 20 LF ~ 40 LFEXISTING ACCESS. NO GRADING. IF RUTTING IS LIKELY TO OCCUR IN DRAINAGE CROSSING INSTALL MATS, TEMPORARY TIMBER BRIDGE, OR SIMILAR CM TO MINIMIZE RUTTING AND SEDIMENT TRANSPORT. S S INTERSECTION WITH PAVED ROAD ~50' NORTH. INSTALL TRACKING CONTROL WHERE ACCESS MEETS HWY 6. PERFORM STREET SWEEPING IMMEDIATELY IF TRACKOUT OCCURS. PSCL CONTROL MEASURE LEGEND PSCL SCL V T S S VTC SEDIMENT CONTROL LOG PORTABLE SEDIMENT CONTROL LOG VEGETATION TOPOGRAPHY STREET SWEEPING VEHICLE TRACKING CONTROL FLOW DIRECTION SEPTEMBER 2022 ! ! ! ! ! ! ! ! ! ! ! ! ! ! 50 8 0 507 0 506 0 5050 50 4 0 5040 503050605050 503050205090 504050405030 6670-59 6670-60 6670-61 6670-62 6670-63 6670-64 GARFIELD COUNTY 393 390 387 391 389 388 394 392 XCEL 6670 REBUILD PHASE 1: DEBEQUE SUBSTATION TO UNA SUBSTATION © 2022 Microsoft Corporation © 2022 Maxar ©CNES (2022) Distribution Airbus DS 0 75 150 Feet NOTES 1. CONTRACTOR TO KEEP WITHIN PRE-DEFINED CONSTRUCTION LIMITS. INSTALL CONSTRUCTION FENCE (CF) AT CONSTRUCTION LIMITS IF NEEDED TO CONFINE CONSTRUCTION CREWS & EQUIPMENT. 2. FLOW DIRECTION SHOWN WHERE SURFACE FLOW DIRECTION IS DISCERNIBLE GIVEN TOPOGRAPHY. SWMP INSPECTOR TO UPDATE FLOW DIRECTIONS ON MAP IN FIELD. 4. TOPOGRAPHY BASED ON USGS 2 METER DEM. TOPOGRAPHIC LINES ARE APPROXIMATE. 5. INSTALL DOWN-GRADIENT CONTROL MEASURES (CMs) FOR ALL STOCKPILES AT ALL LOCATIONS REGARDLESS OF CM DESIGNATION. 6. REFER TO VT DETAIL FOR INFORMATION REGARDING REQUIRED BUFFER DISTANCES FOR USE OF VT IN LIEU OF STRUCTURAL CM. 7. PORTABLE SEDIMENT CONTROL LOG (PSCL) TO BE PLACED ON DOWN-GRADIENT SIDE OF DISTURBANCE. 8. INITIAL PHASE CMs MUST BE INSTALLED BEFORE GROUND DISTURBING ACTIVITIES MAY COMMENCE IN THAT AREA. INTERIM CMs REQUIRED WHILE CONSTRUCTION IS ACTIVE IN THE AREA. FINAL CMs MUST REMAIN IN PLACE UNTIL UPGRADIENT AREAS HAVE REACHED FINAL STABILIZATION. 9. CMs LABELED "INITIAL, INTERIM" TO BE REMOVED PRIOR TO IMPLEMENTATION OF FINAL STABILIZATION. ALL OTHER CMs TO REMAIN IN PLACE UNTIL FINAL STABILIZATION OF SURROUNDING AND UP-GRADIENT AREAS HAVE BEEN ACHIEVED. 10. CONTRACTOR MUST RESTORE ALL DISTURBED AREAS DUE TO CONSTRUCTION AND REMOVAL OF CMs WITH SEED AND MULCH. PSCL PSCL V T V T V T V T PSCL PSCL ADD CRUSHED ROCK TO DRAINAGE CROSSING. CONTRACTOR TO MODIFY CROSSING AS NECESSARY PH 1 DE BEQUE TO UNA SUBSTATION SWMP DRAWINGS SH 18 PSCL ~ 40 LF ~ 20 LF ~ 40 LF ~ 40 LF ~ 20 LF V T V T V T V T V T IF RUTTING IS LIKELY TO OCCUR IN DRAINAGE CROSSING INSTALL MATS, BRIDGING, OR SIMILAR CM TO MINIMIZE RUTTING AND SEDIMENT TRANSPORT. ~ 20 LF EXISTING ACCESS. NO GRADING. CONTROL MEASURE LEGEND PSCL SCL V T S S VTC SEDIMENT CONTROL LOG PORTABLE SEDIMENT CONTROL LOG VEGETATION TOPOGRAPHY STREET SWEEPING VEHICLE TRACKING CONTROL FLOW DIRECTION SEPTEMBER 2022 ! ! ! ! ! ! ! ! ! ! ! ! ! ! !US Hw y 6 5040 5030 50 7 0 5060 505 0 5020 5080 5070 5060 5050 501050405010 5030 6670-64 6670-65 6670-66 6670-67 6670-68-DE 6670-69 6670-70 GARFIELD COUNTY 39.39312414, -108.12183877 39.39526523, -108.11855349 39.39422, -108.11745155 387 385 382386383 384 381 380 XCEL 6670 REBUILD PHASE 1: DEBEQUE SUBSTATION TO UNA SUBSTATION © 2022 Microsoft Corporation © 2022 Maxar ©CNES (2022) Distribution Airbus DS 0 75 150 Feet NOTES 1. CONTRACTOR TO KEEP WITHIN PRE-DEFINED CONSTRUCTION LIMITS. INSTALL CONSTRUCTION FENCE (CF) AT CONSTRUCTION LIMITS IF NEEDED TO CONFINE CONSTRUCTION CREWS & EQUIPMENT. 2. FLOW DIRECTION SHOWN WHERE SURFACE FLOW DIRECTION IS DISCERNIBLE GIVEN TOPOGRAPHY. SWMP INSPECTOR TO UPDATE FLOW DIRECTIONS ON MAP IN FIELD. 4. TOPOGRAPHY BASED ON USGS 2 METER DEM. TOPOGRAPHIC LINES ARE APPROXIMATE. 5. INSTALL DOWN-GRADIENT CONTROL MEASURES (CMs) FOR ALL STOCKPILES AT ALL LOCATIONS REGARDLESS OF CM DESIGNATION. 6. REFER TO VT DETAIL FOR INFORMATION REGARDING REQUIRED BUFFER DISTANCES FOR USE OF VT IN LIEU OF STRUCTURAL CM. 7. PORTABLE SEDIMENT CONTROL LOG (PSCL) TO BE PLACED ON DOWN-GRADIENT SIDE OF DISTURBANCE. 8. INITIAL PHASE CMs MUST BE INSTALLED BEFORE GROUND DISTURBING ACTIVITIES MAY COMMENCE IN THAT AREA. INTERIM CMs REQUIRED WHILE CONSTRUCTION IS ACTIVE IN THE AREA. FINAL CMs MUST REMAIN IN PLACE UNTIL UPGRADIENT AREAS HAVE REACHED FINAL STABILIZATION. 9. CMs LABELED "INITIAL, INTERIM" TO BE REMOVED PRIOR TO IMPLEMENTATION OF FINAL STABILIZATION. ALL OTHER CMs TO REMAIN IN PLACE UNTIL FINAL STABILIZATION OF SURROUNDING AND UP-GRADIENT AREAS HAVE BEEN ACHIEVED. 10. CONTRACTOR MUST RESTORE ALL DISTURBED AREAS DUE TO CONSTRUCTION AND REMOVAL OF CMs WITH SEED AND MULCH. EXISTING BOX CULVERT EXISTING GRAVEL ACCESS. NO GRADING. VTC Initial Interim S S PH 1 DE BEQUE TO UNA SUBSTATION SWMP DRAWINGS SH 19 SCL TO BE ULTILIZED FOR PULL PAD GRADING. SEE DETAIL FOR INSTALLATION & MAINTENANCE NOTES. SCL NOT SHOWN BECAUSE INDICIATED ON DETAIL. SCL TO BE ULTILIZED FOR PULL PAD GRADING. SEE DETAIL FOR INSTALLATION & MAINTENANCE NOTES. SCL NOT SHOWN BECAUSE INDICIATED ON DETAIL. SCL NOT SHOWN BECAUSE INDICIATED ON DETAIL. V T V T V T V T V T V T V T V T V T V T V T PSCL ~ 40 LF PSCL ~ 40 LF Initial Interim S S EXISTING DIRT ACCESS. NO GRADING ANTICIPATED. IF GROUND DISTURBANCE OCCURS, INSTALL SCL ON DOWN-GRADIENT TOE OF FILL SLOPE. EXISTING ACCESS. NO GRADING. Initial Interim VTC V T V T EXISTING ACCESS. NO GRADING. IF ACCESS GRADING IS REQUIRED. MAX 3' CUT/FILL. INSTALL SCL ON DOWN-GRADIENT TOE OF FILL SLOPE FOR ALL DISTURBED AREAS. VTC SCL ~135 LF CONTROL MEASURE LEGEND PSCL SCL V T S S VTC SEDIMENT CONTROL LOG PORTABLE SEDIMENT CONTROL LOG VEGETATION TOPOGRAPHY STREET SWEEPING VEHICLE TRACKING CONTROL FLOW DIRECTION SEPTEMBER 2022 CWA ! ! ! ! ! ! ! ! ! ! ! ! ! US Hwy 6 I- 70 I- 70 5090 5070 5060505050405030509050805080 5070 5020 5010 5010 5090 504 0 6670-70 6670-71 6670-72 6670-73 6670-74 GARFIELD COUNTY 39.39732079, -108.11458018 379 375 378 376 373 377 374 XCEL 6670 REBUILD PHASE 1: DEBEQUE SUBSTATION TO UNA SUBSTATION © 2022 Microsoft Corporation © 2022 Maxar ©CNES (2022) Distribution Airbus DS 0 75 150 Feet VTC Initial Interim S S PH 1 DE BEQUE TO UNA SUBSTATION SWMP DRAWINGS SH 20 V T V T V T V T PSCL~ 20 LF EXISTING ACCESS. NO GRADING. VTC Initial Interim S S V T V T V T PSCL PSCL ~ 20 LF ~ 40 LF NOTES 1. CONTRACTOR TO KEEP WITHIN PRE-DEFINED CONSTRUCTION LIMITS. INSTALL CONSTRUCTION FENCE (CF) AT CONSTRUCTION LIMITS IF NEEDED TO CONFINE CONSTRUCTION CREWS & EQUIPMENT. 2. FLOW DIRECTION SHOWN WHERE SURFACE FLOW DIRECTION IS DISCERNIBLE GIVEN TOPOGRAPHY. SWMP INSPECTOR TO UPDATE FLOW DIRECTIONS ON MAP IN FIELD. 4. TOPOGRAPHY BASED ON USGS 2 METER DEM. TOPOGRAPHIC LINES ARE APPROXIMATE. 5. INSTALL DOWN-GRADIENT CONTROL MEASURES (CMs) FOR ALL STOCKPILES AT ALL LOCATIONS REGARDLESS OF CM DESIGNATION. 6. REFER TO VT DETAIL FOR INFORMATION REGARDING REQUIRED BUFFER DISTANCES FOR USE OF VT IN LIEU OF STRUCTURAL CM. 7. PORTABLE SEDIMENT CONTROL LOG (PSCL) TO BE PLACED ON DOWN-GRADIENT SIDE OF DISTURBANCE. 8. INITIAL PHASE CMs MUST BE INSTALLED BEFORE GROUND DISTURBING ACTIVITIES MAY COMMENCE IN THAT AREA. INTERIM CMs REQUIRED WHILE CONSTRUCTION IS ACTIVE IN THE AREA. FINAL CMs MUST REMAIN IN PLACE UNTIL UPGRADIENT AREAS HAVE REACHED FINAL STABILIZATION. 9. CMs LABELED "INITIAL, INTERIM" TO BE REMOVED PRIOR TO IMPLEMENTATION OF FINAL STABILIZATION. ALL OTHER CMs TO REMAIN IN PLACE UNTIL FINAL STABILIZATION OF SURROUNDING AND UP-GRADIENT AREAS HAVE BEEN ACHIEVED. 10. CONTRACTOR MUST RESTORE ALL DISTURBED AREAS DUE TO CONSTRUCTION AND REMOVAL OF CMs WITH SEED AND MULCH. CONTROL MEASURE LEGEND PSCL SCL V T S S VTC SEDIMENT CONTROL LOG PORTABLE SEDIMENT CONTROL LOG VEGETATION TOPOGRAPHY STREET SWEEPING VEHICLE TRACKING CONTROL FLOW DIRECTION SEPTEMBER 2022 PSCL ~ 40 LF PSCL ~ 20 LF !!!!!!!!!!!!! C o Rd 300 Stone Quarry Rd US Hwy 6 I- 70 I- 70 5070 5060 5050 5040 5030 5020 5080 5080 5080 50506670-74 6670-75 6670-76 6670-77 6670-78 GARFIELD COUNTY 372 371 367373 366370369368 XCEL 6670 REBUILD PHASE 1: DEBEQUE SUBSTATION TO UNA SUBSTATION © 2022 Microsoft Corporation © 2022 Maxar ©CNES (2022) Distribution Airbus DS 0 75 150 Feet NOTES 1. CONTRACTOR TO KEEP WITHIN PRE-DEFINED CONSTRUCTION LIMITS. INSTALL CONSTRUCTION FENCE (CF) AT CONSTRUCTION LIMITS IF NEEDED TO CONFINE CONSTRUCTION CREWS & EQUIPMENT. 2. FLOW DIRECTION SHOWN WHERE SURFACE FLOW DIRECTION IS DISCERNIBLE GIVEN TOPOGRAPHY. SWMP INSPECTOR TO UPDATE FLOW DIRECTIONS ON MAP IN FIELD. 4. TOPOGRAPHY BASED ON USGS 2 METER DEM. TOPOGRAPHIC LINES ARE APPROXIMATE. 5. INSTALL DOWN-GRADIENT CONTROL MEASURES (CMs) FOR ALL STOCKPILES AT ALL LOCATIONS REGARDLESS OF CM DESIGNATION. 6. REFER TO VT DETAIL FOR INFORMATION REGARDING REQUIRED BUFFER DISTANCES FOR USE OF VT IN LIEU OF STRUCTURAL CM. 7. PORTABLE SEDIMENT CONTROL LOG (PSCL) TO BE PLACED ON DOWN-GRADIENT SIDE OF DISTURBANCE. 8. INITIAL PHASE CMs MUST BE INSTALLED BEFORE GROUND DISTURBING ACTIVITIES MAY COMMENCE IN THAT AREA. INTERIM CMs REQUIRED WHILE CONSTRUCTION IS ACTIVE IN THE AREA. FINAL CMs MUST REMAIN IN PLACE UNTIL UPGRADIENT AREAS HAVE REACHED FINAL STABILIZATION. 9. CMs LABELED "INITIAL, INTERIM" TO BE REMOVED PRIOR TO IMPLEMENTATION OF FINAL STABILIZATION. ALL OTHER CMs TO REMAIN IN PLACE UNTIL FINAL STABILIZATION OF SURROUNDING AND UP-GRADIENT AREAS HAVE BEEN ACHIEVED. 10. CONTRACTOR MUST RESTORE ALL DISTURBED AREAS DUE TO CONSTRUCTION AND REMOVAL OF CMs WITH SEED AND MULCH. EXISTING DIRT/GRAVEL ACCESS. NO GRADING. PH 1 DE BEQUE TO UNA SUBSTATION SWMP DRAWINGS SH 21 VTC Initial InterimS S CONTROL MEASURE LEGEND PSCL SCL V T S S VTC SEDIMENT CONTROL LOG PORTABLE SEDIMENT CONTROL LOG VEGETATION TOPOGRAPHY STREET SWEEPING VEHICLE TRACKING CONTROL FLOW DIRECTION SEPTEMBER 2022 PSCL ~ 40 LF PSCL ~ 20 LF PSCL ~ 20 LF PSCL ~ 40 LF PSCL ~ 20 LF PSCL ~ 40 LF PSCL ~ 40 LF ~ 20 LF PSCL PSCL ~ 40 LF ~ 20 LF PSCLPSCL PSCL ~ 20 LF ~ 20 LF ! !! ! ! !! ! !!!!!! Co Rd 300Stone Quarry Rd US Hwy 6 I- 70 5080 5070 5 0 6 0 5 0 5 0 50 4 0 5030 5030 6670-78 6670-79 6670-80-DE 6670-81-DE (SWITCH) 6670-82-DE GARFIELD COUNTY 364 361 366 365 363 362 XCEL 6670 REBUILD PHASE 1: DEBEQUE SUBSTATION TO UNA SUBSTATION © 2022 Microsoft Corporation © 2022 Maxar ©CNES (2022) Distribution Airbus DS 0 75 150 Feet NOTES 1. CONTRACTOR TO KEEP WITHIN PRE-DEFINED CONSTRUCTION LIMITS. INSTALL CONSTRUCTION FENCE (CF) AT CONSTRUCTION LIMITS IF NEEDED TO CONFINE CONSTRUCTION CREWS & EQUIPMENT. 2. FLOW DIRECTION SHOWN WHERE SURFACE FLOW DIRECTION IS DISCERNIBLE GIVEN TOPOGRAPHY. SWMP INSPECTOR TO UPDATE FLOW DIRECTIONS ON MAP IN FIELD. 4. TOPOGRAPHY BASED ON USGS 2 METER DEM. TOPOGRAPHIC LINES ARE APPROXIMATE. 5. INSTALL DOWN-GRADIENT CONTROL MEASURES (CMs) FOR ALL STOCKPILES AT ALL LOCATIONS REGARDLESS OF CM DESIGNATION. 6. REFER TO VT DETAIL FOR INFORMATION REGARDING REQUIRED BUFFER DISTANCES FOR USE OF VT IN LIEU OF STRUCTURAL CM. 7. PORTABLE SEDIMENT CONTROL LOG (PSCL) TO BE PLACED ON DOWN-GRADIENT SIDE OF DISTURBANCE. 8. INITIAL PHASE CMs MUST BE INSTALLED BEFORE GROUND DISTURBING ACTIVITIES MAY COMMENCE IN THAT AREA. INTERIM CMs REQUIRED WHILE CONSTRUCTION IS ACTIVE IN THE AREA. FINAL CMs MUST REMAIN IN PLACE UNTIL UPGRADIENT AREAS HAVE REACHED FINAL STABILIZATION. 9. CMs LABELED "INITIAL, INTERIM" TO BE REMOVED PRIOR TO IMPLEMENTATION OF FINAL STABILIZATION. ALL OTHER CMs TO REMAIN IN PLACE UNTIL FINAL STABILIZATION OF SURROUNDING AND UP-GRADIENT AREAS HAVE BEEN ACHIEVED. 10. CONTRACTOR MUST RESTORE ALL DISTURBED AREAS DUE TO CONSTRUCTION AND REMOVAL OF CMs WITH SEED AND MULCH. PH 1 DE BEQUE TO UNA SUBSTATION SWMP DRAWINGS SH 22 SCL TO BE ULTILIZED FOR PULL PAD GRADING. SEE DETAIL FOR INSTALLATION & MAINTENANCE NOTES. SCL NOT SHOWN BECAUSE INDICIATED ON DETAIL. EXISTING DIRT/GRAVEL ACCESS. NO GRADING. PSCL 2X ~ 20 LF PSCL 2X ~ 40 LF IF RUTTING IS LIKELY TO OCCUR IN DRAINAGE CROSSING INSTALL MATS, TEMPORARY TIMBER BRIDGE, OR SIMILAR CM TO MINIMIZE RUTTING AND SEDIMENT TRANSPORT. CONTROL MEASURE LEGEND PSCL SCL V T S S VTC SEDIMENT CONTROL LOG PORTABLE SEDIMENT CONTROL LOG VEGETATION TOPOGRAPHY STREET SWEEPING VEHICLE TRACKING CONTROL FLOW DIRECTION SEPTEMBER 2022 PSCL PSCL PSCL PSCL PSCL PSCL PSCL ~ 40 LF ~ 40 LF ~ 20 LF ~ 20 LF ~ 20 LF ~ 20 LF~ 40 LF ~ 40 LF CWA