Loading...
HomeMy WebLinkAboutStormwater Management PlanStormwater Management Plan for Cougar Crossing Tract E Lot Split (GarCo P.I.N. 212724100385) BOUNDAPIES UNLIMITED iNc. CIVIL ENGINEERING; LAND SURVEYING E BEYOND 14'�!� `� II S7 - SS 35 SA-- I j r; r A 923 Cooper Avenue, Ste. 201 Glenwood Springs, CO 81601 Prone (970)94,5-3282 Fax (970) 384-2833 E-=@ phil@bu-ine.com 7'� Afcsvr,��ffe t: Fier+: ray C'ikl� I- Reser+r�lr Aria 1 £ r ' y►» tir �L�l'h "•1L ter+. Pslualo Mum ay Fr-q :7' wile Accer Wue {.; Cougar Grassing 1 i r �[ H jmrnW2ad fw c6a f:M1Sr Fm Rmwe 16 7L � l /T �•�,-ten 4VT S7y.7�7 r,• p.II�nT5 In SECTION 24, TOWNSHIP 5 SOUTH, RANGE 92 WEST, 6T" PM GARFIELD COUNTY, COLORADO Prepared for: Hillman, Tatnall L Revocable Trust 504 W Bleeker St Aspen, CO 81611 Attn: Chris Leverich (970) 925-5400 Stormwater Management Plan Page 1 C.I Genera! Requirements In general, the following Stormwater Management Plan follows the outline of the SWMP Fact Sheet to Permit COR400000, provided from the Colorado Dept. of Public Health and Environment dated November 1, 2018. The SWMP contents that follow, specifically address each item included in the preparation guidance.. C.2 Site Descri tion Construction Activity The 1/2- mile private drive will access eight (8) thirty- five (35) acre plus SB (Senate Bill) lots. Near the entrance off of Harvey Gap Road (AKA CR 237) is an underground fire storage tank and near the terminus is an emergency vehicle turnout and turnaround. At the terminus of the driveway is a smaller turn -a -round for residents and guests. Overall, approximately 1.8 acres will be disturbed. The property is located on the east side of Harvey Gap Road, southeasterly of the Harvey Gap Reservoir, west of three (3) parcels created by the Grand Hogback Subdivision Exemption and twelve (12) thirty-five acre plus lots. Adjacent to the north is Farmers Irrigation Company (FICO) and also north and east is Bureau of Land Management (BLM). To the south are four (4) thirty-five (35) acre plus lots. East of Harvey Gap Road is the controlled and emergency overflow from the reservoir. The channel lies in portions of five (5) lots and is north of the access drive. Silt is approximately 4 miles south and Newcastle 14 miles (ESE) via Buford Road. The 292-acre site is legally Tract E (R.N. 802740) and Garfield County Assessors P.I.N. 2127 241 00385. There will be a maximum of eight (8) thirty-five (35) acre plus lots utilizing the private drive. Construction activities will consist of installation of sediment fence, dry utilities, drainage culverts and swale grading, driveway prep for 6" Class 6 base and reseeding. There are several check dams along the driveway, interceptor drainage ditches uphill side of the driveway and erosion control on the downhill side. Private wells and the Onsite Wastewater Treatment System (OWTS) will be done with each individual site development. Construction Sequence The date for beginning construction activities is estimated to be in the late June 2026. Implementation of the storm water management plan is required to be in place prior to initiating construction activities. The following general sequence of activities will be followed in the construction process: -Application of RoundUp and /or WeedMasterfor noxious weeds and any other that pop up in the meantime. -Appoint a Stormwater Management Plan Administrator -Installation of the perimeter sediment controls such as sediment control fencing, erosion logs, culvert installation and vehicle tracking control pad -Site earthwork will be completed to the subgrade of the roadway -Construction of dry utilities, culvert inlet and outlet protection and any decorative/boulder walls -Complete placement of 6" Class 6 Aggregate Base on drive and emergency turnaround -Complete finish grading, swales and revegetation Stormwater Management Plan Page 2 - Apply weed control 1-2 times per growing season - Remove temporary erosion control measures - Post construction site inspectign t� Site Area The area of Cougar Crossing is 292 acres. Area disturbed with the construction of the of private drive is 1.8 acres. Existing Vegetation & Site Soils The site is currently vacant. The site soils consist of native vegetation. The National Resource Conservation Service (MRCS) Soils Classification Map shows 172 acres (59%) of the 292-acre site to be Cushman-Lazear stony loams, 15 to 65% slopes, 90 acres (31 %) of the 292-acre site to be Torriorthents-Rock outcrop complex, steep slopes, and the remaining 30 acres (10 %) of the site to be Dollard -Rock outcrop, shale complex, 25 to 65% slopes. The 1.8 acres of the disturbance is in the Torriorthents-Rock outcrop complex but slopes vary from 0% to 20%. Their permeability is slow. All the site soils are well drained with the hazard of water erosion as moderate and a flood frequency of "None". The entire access drive, lies within the Cushman- Lazear stoney loams having a Hydrologic Soil Group rating "C", while both the Dollard -Rock and Torriorthents areas have Soil Group rating "D". The dry climate soils have low organic matter with caliche layers that make excavation difficult. The low shrink -swell is good for foundations, although "very limited" for dwellings with basements. The main limitations noted are shallow bedrock and steep slopes. Septic tanks most likely will require engineered alternative systems. Potential Pollution Sources Potential pollution sources at this site include sediment, equipment/vehicle washing, vehicle maintenance and fueling, solvents, (wood treatment products, asphalt paving, concrete, metal, petroleum products are not a part of this project), waste storage & disposal, offsite sediment, and transport from vehicle tracking. Many chemicals typically associated with construction activities are considered potential pollutants. The table below lists many of these pollutants. Careful handling, storage, and application of these materials reduce the likelihood that these chemicals will contribute to pollution of the environment. Preventive practices are discussed in greater detail in the materials handling and spill prevehtion section. Potential Pollutant Source Construction vehicles, gas cans, small equipment, etc. Location Gasoline Job site, access roads, onsite tanks, and fuel sites Diesel Fuels Heavy construction equipment Job site, access roads, and fuel sites Oil, grease & hydraulic fluids construction vehicles, heavy construction equipment, generators, small containers and lift equipment Job site, access roads, fuel sites, storage sites, lift stations, etc. Solvents Paints, stains, & varnishes small containers Job site and storage areas small containers, bulk containers, spray equipment, etc. Job site and storage areas Glues, waterproofing compounds small containers, bulk containers, etc. Job site and storage areas Fertilizers bulk containers, spreaders, etc. Storage areas Chlorine disinfections of water lines Job site and storage areas Stormwater Management Plan Page 3 Cement I bulk containers i Job site and storage areas Metals, paint chips, wood chips, construction debris Job site and access roads insulation, asbestos, & plastics septic tank/leach field systems, broken Microbiological contaminates sanitary wastewater sewer lines, portalettes Glycol construction vehicles and equipment, Job site, access roads, and compressor small containers, and bulk containers site Tackifiers bulk containers and spray equipment Job site and storage areas Non-Stormwater discharges Potable water is anticipated as a non-stormwater discharge. Potable water may be used for grading, dust control, and irrigation of erosion control and permanent landscaping. An effort shall be made to use only the amount of potable water required for these operations. Construction dewatering is not anticipated as part of this project. Any other non-stormwater discharges resulting from construction activity are not covered under this SWMP. If groundwater discharges are anticipated, a separate construction dewatering discharge permit is required through the CDHPE. Outfalls and Receiving Waters Area A: Sheet C-1: Sta 0+00 to Sta 7+80 [High Pt.} Lot 13 - All offsite and onsite flows are intercepted by the existing Harvey Gap Road borrow ditch along easterly side of private drive. Lots 14 and northerly 330 feet of Lot 15 — There are no offsite flows and onsite sheet flows into the graded borrow ditch along the easterly side of the access road to an existing culvert at 4+75. Triple 24-inch with both inlet and outlet protection at to be installed at low point 5+07 (See Sheet C- 1, Pipe Detail on C-2 and Outlet Protection on C-3). This is Basin 1 (North) as studied in the "Drainage Study for Tract E Lot Split" as submitted with the Driveway Grading Plan & Profiles for GarCo permitting. Area B: Sheet C-1: Sta 7+80 to 19+28 (High Pt.) on Sheet C-3 There are no offsite flows onto the southerly 235 feet of Lot 15 through to the high point at 19+25 on Lot 18 (Sheet C-3). Onsite flows from Lots 15 — 18 high points are carried to low point Lot 18 via the roadside ditch graded along easterly side of access drive. Triple 24-inch with both inlet and outlet protection at to be installed at low point 18+36 (See Sheet C-1, Pipe Detail on C-2 and Outlet Protection on C-3). This is Basin 2 (South) as studied in the "Drainage Study for Tract E Lot Split" as submitted with the Driveway Grading Plan & Profiles for GarCo permitting. Area C: Sheet C-3: Sta 19+28 to Lot 20 There are no offsite flows onto Lots 18-20. Flows from Lots 18 and 19 will be carried via the roadside ditch graded along the easterly side of the access drive. An 18-inch culvert is provided at 26+32 to intercept flows from flowing across emergency vehicle turnaround. Both inlet and outlet protection will be provided at the crossing (See Sheet C-1, Pipe Detail on C-2 and Outlet Protection on C-3). Swales shall be protected with erosion logs and/or straw bale barriers during development of the Stormwater Management Plan Page 4 Non -Structural BMP's Non-structural BMPs may include temporary seeding, permanent seeding, mulching, geotextiles, sod stabilization, vegetative buffer strips, protection of trees, and preservation of mature vegetation. All non-structural BMPs shall conform to the approved construction plans and Town standards. Good housekeeping BMPs should also be followed throughout the entire life of the project. These include the following: - refuse receptacles should be regularly emptied and equipped with lids, - keeping machinery in good operating condition to prevent leakage, and - apply appropriate (not excessive) amounts of fertilizer to the landscaping. - scheduled maintenance of BMPs and cleaning of any downstream storm drains, grates and inlets. Other housekeeping practices should include general site cleanliness and proper training of employees. Phased BMP Implementation Pre construction Install curb socks in existing curb & gutter downstream of the site. Install Vehicle Tracking Control (VTCs) on site entrance(s) Designate waste management stockpile areas Ensure all Potential pollutants are contained and isolated Install rock socks or similar around potential pollutant areas (i.e. portalette, trash bins) Clear & Grub/ Initial Grading Implement soil stabilization as determined necessary by the SWMP Administrator Infrastructure Construction Install erosion bales around inlets Install curb socks in and behind new curb & gutter Install erosion control fabric on new slopes in locations per construction plans Seed/landscape disturbed areas where construction traffic is no longer anticipated Final Stabilization Seed/landscape disturbed all disturbed areas Remove temporary erosion control BMPs where vegetation has been established to 70% of pre -disturbance levels Materials Handling and Spill Prevention Sometimes materials that are used at the construction site present a potential for contamination of stormwater runoff. These include such items as listed in the Potential Pollution Sources section of this plan. Practices that can be used to prevent or minimize toxic materials in runoff from the construction site are described in this section. A list of all potentially toxic or hazardous chemicals used shall be maintained on the site. Warning labels must be attached to all potential toxic or hazardous chemicals. Material safety data sheets (MSDS) and other safety information for a potential toxic or hazardous substance will be on file and accessible (on the site) during all periods in which the substance is used or stored. In addition, to maintain an inventory of potentially toxic and/or hazardous materials and associated safety information, the following materials management practices must be followed. is Materials will be handled in accordance with Occupational Safety and health Administration (OSHA) requirements and manufactures instructions. Stormwater Management Plan Page 6 • Chemicals regulated under the Comprehensive Environmental Response, Compensations and Liability Act (CERCLA) will be reported and handled in accordance with relevant regulations. • Materials stored at the construction site will be covered or otherwise protected from the elements. • The quantity of fuel and lubricants stored at the construction site will be limited to the amount that is reasonable to support the specific construction or maintenance activity. Strict storage practices (i.e. offsite storage) are preferable. Fuel, hydraulic oil, and form oil should be stored offsite. ■ Bulk storage areas for materials not consumed on a daily basis will be enclosed and protected from the elements and contained in a manner to prevent release to the environment. Petroleum products and fertilizers will be stored at separate facilities or isolated by impermeable barriers. • Hypochlorite and other chlorine compounds will be stored separately from other materials and kept dry. • Areas at the construction site that are used for storage of toxic materials and petro products shall be designed with an enclosure, container, or dike located around the perimeter of the storage area to prevent discharge of these materials in runoff from the construction site, these barriers will also function to contain spilled materials from contact with surface runoff. • Measures to prevent spills or leaks of fuel, gear oil, lubricants, antifreeze, and other fluids from construction vehicles and heavy equipment shall be considered to protect groundwater and runoff quality. All equipment maintenance shall be performed in a designated area and measures, such as drip pans, used to contain petroleum products. Spills of construction related products such as paints, solvents, or other fluids and chemicals, shall be cleaned up immediately and disposed of properly. Concrete trucks and other concrete coated equipment shall be cleaned only in properly bermed, designated washout areas. • Hazardous materials and washouts shall be stored in covered, leak -proof containers • When fueling must take place onsite, designate an area away from drainage courses to be used. Dedicated fueling areas shall be protected from stormwater run-on and runoff, and shall be a minimum of 50 feet away from drainage courses. The area is to be protected with berms and dikes. Secondary containment, such as a drop cloth or drain pan, will be used to catch spills if necessary. If a spill does occur, the operator will use absorbent materials to remove as much of the spill as possible. The spent absorbent material will be disposed of properly and promptly. There will be no bulk storage of fuel onsite. Dedicated Concrete or Asphalt Batch Plants Areas dedicated for concrete or asphalt batch particular project. plants are not anticipated to be used with this Vehicle Tracking Control Vehicle Tracking Controls are used in order to prevent construction vehicles from tracking mud, soil, and other debris onto public roads. They consist of a stone -stabilized pad placed at the exit(s) to the Stormwater Management Plan Page 7 site. When vehicles move over the pad, the rough surface shakes lose any mud and debris that may have been carried into the public right of way. VTCs shall be located at the designated entrance(s) to the site as determined by the SWMP Administrator. A VTC shall also be provided at the construction trailer for the site and at the designated concrete washout if these locations happen to be located offsite. Waste Management and Disposal, Including Concrete Washout Waste stockpiles shall be located at a location on the site that will not be disturbed by construction traffic and shall be established at a location as determined by the SWMP Administrator. A temporary concrete washout facility should be established that is located a minimum of 50ft from storm drain inlets, open drainage facilities, and watercourses. The facility should be located away from construction traffic or access areas to prevent disturbance or tracking. Groundwater and Stormwater Dewatering Construction dewatering is not anticipated as part of this project. -Any other non-stormwater discharges resulting from construction activity are not covered under this SWMP. If groundwater discharges are anticipated, a separate construction dewatering discharge permit is required through the CDHPE. C.5 FINAL STABALIZATION Once homes are completed, individual lot owners will landscape their lots. Within one growing season of the project completion, uniform vegetative site coverage shall be equal to or greaterthan 70% (minimally) of the pre -disturbance levels or physical erosion reduction methods have been employed, to be considered stabilized. When the site is determined to have reached the final stabilization stage, sediment control fencing and erosion logs can be removed. Long term stormwater management will be established through the use of the initial primary sediment and oil capture by sheet flow via grass lined swales. C.6 INSPECTION AND MAINTENANCE A thorough inspection and maintenance of the storm water management system is required every 14 days and within 24 hours of any precipitation or snowmelt event that causes surface runoff. The permittee shall retain a copy of the Storm Water Management Plan required by this permit at the construction site from the date of project initiation to the date of final stabilization. The permittee shall retain copies of the Storm Water Management Plan and all reports required by the permit and records of all data used to complete this application for a period of at least three years from the date of final stabilization. These records must be available to the Division or EPA upon request. The following items must be documented as part of the site inspections: • The inspection date • Name(s) and title(s) of personnel making the inspection • Location(s) of discharges of sediment or other pollutants from the site • Location(s) of BMPs that need to be maintained • Location(s) of BMPs that failed to operate as designed or proved inadequate for a particular location Stormwater Management Plan Page 8 • Location(s) where additional BMPs are needed that were not in place at the time of inspection ■ Deviations from minimum inspection schedule = Description of corrective actions ■ Signature indicating that the site is in compliance with the permit to the best of the signers' knowledge In addition to inspection records, the permittee may opt to keep a log book for use in tracking other items related to the SWMP such as those listed below: • records of any spills, leaks, or overflows, including time, date and weather condition, • implementation of specific items in SWMP, • events involving materials handling and storage, • contacts with regulatory agencies • maintenance and repair of storm water management controls, = preventive maintenance activities, ■ inspection activities and ■ dated photographs. A copy of a Stormwater Management Plan Activity Log, a Stormwater Field Inspection Log (CDOT Form #1176) and a Daily Stormwater Log (CDOT Form #1388) have been attached and are to be used as a part of the inspection report. References: Colorado State Office of the Natural Resources Conservation Service (NRCS) "Soil Survey of Rifle Area, Colorado, parts of Garfield and Mesa Counties (C0683)- Silt Colorado USGS Quadrangle Stormwater Management Plan Page 9 -APPLICATION -STORMWATER MANAGEMENT PLAN (PAGES 1-10) -OVERALL SITE MAP (PAGE 4A) -VICINITY MAP (PAGE 11) ATTACHMENTS -SITE MAP (APPROVED GARFIELD COUNTY PERMIT SET AVAILABLE AT CONSTRUCTION TRAILER IN MAP POCKET) SHEET C-1 DRIVEWAY PLAN AND PROFILE (0+00 to 10+00) W/NOTES 1- 11 AND CUT/FILL SUMMARY SHEET C-2 DRIVEWAY PLAN AND PROFILE (11+00 to 19+00) W/ CULVERT LAYOUT FOR COMPACTION ZONES AND COMPOST SOCKS FOR SEDIMENT CONTROL SHEET C-3 DRIVEWAY PLAN AND PROFILE (19+00 to 27+54) W/ CRFR NOTE AND OUTLET PROTECTION DETAIL DRIVEWAY SECTION SHOWN ON EACH SHEET -EROSION & SEDIMENT CONTROL BMP'S (URBAN DRAINAGE FLOOD CONTROL DIST.- VOL. 3) SC-1 SF SILT FENCE SC-2 SCL SEDIMENT CONTROL LOG SC-3 SBB STRAW BALE BARRIER MM 1 CWA CONCRETE WASHOUT AREA MM-3 GH GOOD HOUSEKEEPING PRACTICES SM-1 CID CONSTRUCTION PHASING/ SEQUENCING SM-4 VTC VEHICLE TRACKING CONTROL SM-6 SSA STABILIZED STAGING AREA —STORMWATER MANAGEMENT PLAN ACTIVITY LOG -STORMWATER FIELD INSPECTION LOG (CDOT FORM #1176) -DAILY STORMWATER LOG (CDOT FORM #1388) Stormwater Management Plan Page 10 the individual home owner. Water quality will be provided by erosion logs and/or straw bale barriers swales. Borrow ditch flows range from 0.3 to 2 cubic foot per second for the 10-year event. C.3 Site Plan See attachment, Site Plan, Sheet C1. A full set of Garfield County Building Dept Permitted Civil Plans will be onsite in Contractor's trailer at all times as well as this SWMP. Sheet C1 Driveway Plan and Profile Sheet C2 Driveway Plan and Profile Sheet C3 Driveway Plan and Profile C.4 Stormwater Management Controls The following describes the site management controls that will be implemented in accordance with typical Best Management Practices (BMP's). SWMP Administrator The Stormwater Management Plan Administrator is responsible for developing, implementing, maintaining, and revising the SWMP. The activities and responsibilities of the administrator shall address all aspects of the facility's SWMP. For Cougar Creek the manager for the Owner, Chris Leverich will be utilized as the SWMP Administrator. Identification of Potential Pollutant Sources These sources have been more particularly described above in section C.2 Site Description. Structural BMP's Structural BMPs include sediment control fencing installed along the lower boundaries of the excavation/grading areas. Certified weed free hay bales, check dams, silt dikes or erosion control logs should be installed in channels, ditches and around culvert entrances in accordance with Colorado Department of Transportation M-Standards. Surface roughening- of exposed soils to dissipate runoff energy and slow runoff velocity to aid in the prevention of soil erosion and promote infiltration. Sediment control logs, curb socks or gravel bags placed flush in curb & gutter to slow runoff velocity and promote sedimentation. Sediment control logs, rock socks or gravel bags installed on grade to slow runoff velocity and promote sedimentation on the downhill side of semi - hazardous areas such as portalettes and trash bins. These controls should be sufficient to mitigate the sediment discharged into the existing system. Non -Structural BMP's Non-structural BMPs may include temporary seeding, permanent seeding, mulching, geotextiles, sod stabilization, vegetative buffer strips, protection of trees, and preservation of mature vegetation. All non-structural BMPs shall conform to the approved construction plans and Town standards. Stormwater Management Plan Page 5 Good housekeeping BMPs should also be followed throughout the -entire life of the project. These include the following: - refuse receptacles should be regularly emptied and equipped with lids, - keeping machinery in good operating condition to prevent leakage, and - apply appropriate (not excessive) amounts of fertilizer to the landscaping. - scheduled maintenance of BMPs and cleaning of any downstream storm drains, grates and inlets. Other housekeeping practices should include general site cleanliness and proper training of employees. Phased BMP Implementation Pre construction Install curb socks in existing curb & gutter downstream of the site. Install Vehicle Tracking Control (VTCs) on site entrance(s) Designate waste management stockpile areas Ensure all Potential pollutants are contained and isolated Install rock socks or similar around potential pollutant areas (i.e. portalette, trash bins) Clear & Grub/ Initial Grading Implement soil stabilization as determined necessary by the SWMP Administrator Infrastructure Construction Install erosion bales around inlets Install curb socks in and behind new curb & gutter Install erosion control fabric on new slopes in locations per construction plans Seed/landscape disturbed areas where construction traffic is no longer anticipated Final Stabilization Seed/landscape disturbed all disturbed areas Remove temporary erosion control BMPs where vegetation has been established to 70% of pre -disturbance levels Materials Handling and Spill Prevention Sometimes materials that are used at the construction site present a potential for contamination of stormwater runoff. These include such items as listed in the Potential Pollution Sources section of this plan. Practices that can be used to prevent or minimize toxic materials in runoff from the construction site are described in this section. A list of all potentially toxic or hazardous chemicals used shall be maintained on the site. Warning labels must be attached to all potential toxic or hazardous chemicals. Material safety data sheets (MSDS) and other safety information for a potential toxic or hazardous substance will be on file and accessible (on the site) during all periods in which the substance is used or stored. In addition, to maintain an inventory of potentially toxic and/or hazardous materials and associated safety information, the following materials management practices must be followed. Materials will be handled in accordance with Occupational Safety and health Administration (OSHA) requirements and manufactures instructions. ■ Chemicals regulated under the Comprehensive Environmental Response, Compensations and Liability Act ,(CERCLA) will be reported and handled in accordance with relevant regulations. • Materials stored at the construction site will be covered or otherwise protected from the Stormwater Management Plan Page 6 elements. ■ The quantity of fuel and lubricants stored at the construction site will be limited to the amount that is reasonable to support the specific construction or maintenance activity. Strict storage practices (i.e. offsite storage) are preferable. Fuel, hydraulic oil, and form oil should be stored offsite. • Bulk storage areas for materials not consumed on a daily basis will be enclosed and protected from the elements and contained in a manner to prevent release to the environment. • Petroleum products and fertilizers will be stored at separate facilities or isolated by impermeable barriers. • Hypochlorite and other chlorine compounds will be stored separately from other materials and kept dry. • Areas at the construction site that are used for storage of toxic materials and petro products shall be designed with an enclosure, container, or dike located around the perimeter of the storage area to prevent discharge of these materials in runoff from the construction site, these barriers will also function to contain spilled materials from contact with surface runoff. • Measures to prevent spills or leaks of fuel, gear oil, lubricants, antifreeze, and other fluids from construction vehicles and heavy equipment shall be considered to.protect groundwater and runoff quality. All equipment maintenance shall be performed in a designated area and measures, such as drip pans, used to contain petroleum products. Spills of construction related products such as paints, solvents, or other fluids and chemicals, shall be cleaned up immediately and disposed of properly. Concrete trucks and other concrete coated equipment shall be cleaned only in properly bermed, designated washout areas. • Hazardous materials and washouts shall be stored in covered, leak -proof containers. When fueling must take place onsite, designate an area away from drainage courses to be used. Dedicated fueling areas shall be protected from stormwater run-on and runoff, and shall be a minimum of 50 feet away from drainage courses. The area is to be protected with berms and dikes. Secondary containment, such as a drop cloth or drain pan, will be used to catch spills if necessary. If a spill does occur, the operator will use absorbent materials to remove as much of the spill as possible. The spent absorbent material will be disposed of properly and promptly. There will be no bulk storage of fuel onsite. Dedicated Concrete or Asphalt Batch Plants Areas dedicated for concrete or asphalt batch plants are not anticipated to be used with this particular project. Vehicle Tracking Control Vehicle Tracking Controls are used in order to prevent construction vehicles from tracking mud, soil, and other debris onto public roads. They consist of a stone -stabilized pad placed at the exit(s) to the site. When vehicles move over the pad, the rough surface shakes lose any mud and debris that may have been carried into the public right of way. VTCs shall be located at the designated entrance(s) to the site as determined by the SWMP Administrator. A VTC shall also be provided at the construction trailer for the site and at the designated concrete washout if these locations happen to be located offsite. Stormwater Management Plan Page 7 Waste Management and Disposal, Including Concrete Washout Waste stockpiles shall be located at a location on the site that will not be disturbed by construction traffic and shall be established at a location as determined by the SWMP Administrator. A temporary concrete washout facility should be established that is located a minimum of 50ft from storm drain inlets, open drainage facilities, and watercourses. The facility should be located away from construction traffic or access areas to prevent disturbance or tracking. Groundwater and Stormwater Dewatering Construction dewatering is not anticipated as part of this project. Any other non-stormwater discharges resulting from construction activity are not covered under this SWMP. If groundwater discharges are anticipated, a separate construction dewatering discharge permit is required through the CDHPE. C.5 FINAL STABALIZATION Once homes are completed, individual lot owners will landscape their lots. Within one growing season of the project completion, uniform vegetative site coverage shall be equal to or greater than 70% (minimally) of the pre -disturbance levels or physical erosion reduction methods have been employed, to be considered stabilized. When the site is determined to have reached the final stabilization stage, sediment control fencing and erosion logs can be removed. Long term stormwater management will be established through the use of the initial primary sediment and oil capture by sheet flow via grass lined swales. C.6 INSPECTION AND MAINTENANCE A thorough inspection and maintenance of the storm water management system is required every 14 days and within 24 hours of any precipitation or snowmelt event that causes surface runoff. The permittee shall retain a copy of the Storm Water Management Plan required by this permit at the construction site from the date of project initiation to the date of final stabilization. The permittee shall retain copies of the Storm Water Management Plan and all reports required by the permit and records of all data used to complete this application for a period of at least three years from the date of final stabilization. These records must be available to the Division or EPA upon request. The following items must be documented as part of the site inspections: • The inspection date • Name(s) and title(s) of personnel making the inspection • Location(s) of discharges of sediment or other pollutants from the site ® Location(s) of BMPs that need to be maintained n Location(s) of BMPs that failed to operate as designed or proved inadequate for a particular location Location(s) where additional BMPs are needed that were not in place at the time of inspection Deviations from minimum inspection schedule Description of corrective actions Signature indicating that the site is in compliance with the permit to the best of the Stormwater Management Plan Page 8 signers' knowledge In addition to inspection records, the permittee may opt to keep a log book for use in tracking other items related to the SWMP such as those listed below: • records of any spills, leaks, or overflows, including time, date and weather condition, • implementation of specific items in SWMP, • events involving materials handling and storage, • contacts with regulatory agencies • maintenance and repair of storm water management controls, • preventive maintenance activities, inspection activities and • dated photographs. A copy of a Stormwater Management Plan Activity Log, a Stormwater Field Inspection Log (CDOT Form #1176) and a Daily Stormwater Log (CDOT Form #1388) have been attached and are to be used as a part of the inspection report. References: Colorado State Office of the Natural Resources Conservation Service (NRCS) "Soil Survey of Rifle Area, Colorado, parts of Garfield and Mesa Counties (C0683)" Silt Colorado USGS Quadrangle Stormwater Management Plan Page 9 -APPLICATION -STORMWATER MANAGEMENT PLAN (PAGES 1-10) -OVERALL SITE MAP (PAGE 4A) -VICINITY MAP (PAGE 11) ATTACHMENTS -SITE MAP (APPROVED GARFIELD COUNTY PERMIT SET AVAILABLE AT CONSTRUCTION TRAILER IN MAP POCKET) SHEET C-1 DRIVEWAY PLAN AND PROFILE W/NOTES AND CUT/FILL SUMMARY SHEET C-2 DRIVEWAY PLAN AND PROFILE W/ CULVERT LAYOUT FOR COMPACTION ZONES AND COMPOST SOCKS FOR SEDIMENT CONTROL SHEET C-3 DRIVEWAY PLAN AND PROFILE W/ OUTLET PROTECTION DETAIL DRIVEWAY SECTION SHOWN ON EACH SHEET -EROSION & SEDIMENT CONTROL BMP'S (URBAN DRAINAGE FLOOD CONTROL DIST.-VOL. 3) SC-1 SF SILT FENCE SC-2 SCL SEDIMENT CONTROL LOG SC-3 SBB STRAW BALE BARRIER MM-1 CWA CONCRETE WASHOUT AREA - MM-3 GH GOOD HOUSEKEEPING PRACTICES SM-1 CP CONSTRUCTION PHASING/ SEQUENCING SMA VTC VEHICLE TRACKING CONTROL SM-6 SSA STABILIZED STAGING AREA -STORMWATER MANAGEMENT PLAN ACTIVITY LOG -STORMWATER FIELD INSPECTION LOG (CDOT FORM #1176) -DAILY STORMWATER LOG (CDOT FORM #1388) Stormwater Management Plan Page 10 VICINITY MAP 4463 Yl NW 5) From Silt,COLO. Quadrangle, Photorevised 1987 Scale: 1"=2000' (tea ► i