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HomeMy WebLinkAbout4.0 Referral CommentsRECEIVED JAN 0 8 2003 GARFIFLD COUNT STATE OF COLORADO allitfrtNG & PLANNtNW Bill Owens, Governor Douglas H. Benevento, Acting Executive Director Dedicated to protecting and improving the health and environment of the people of Colorado Grand Junction Regional Office 222 S. 6th St., Rm 232 Grand Junction CO 81501-2768 Fax (970) 248-7198 http://www.cdphe.state.co.us December 26, 2002 Cerise Ranch Subdivision Wintergreen Homes, L.L.C. Attn.: Mr. Art Kleinstein, Managing Partner PO Box 1530 Avon, CO 81620 Colorado Depai tment of Public Health and Environment Re: Capacity Development Plans Review Approval for the Cerise Ranch Subdivision, Willow Well, Chlorination System, and Storage Tank, PWSID# PENDING, Community, Garfield County Dear Mr. Kleinstein: The Public Water System capacity development design and construction specifications for the Cerise Ranch Subdivision, Community Water System, received on May 1, 2000, August 1, 2000, August 7, 2000, and September 6, 2002 for the Willow Well, Chlorination System, and Storage Tank, have been received and reviewed in accordance with Article 2.1.5 of the Colorado Primary Drinking Water Regulations, and are hereby approved under the following conditions: 1. A detailed vulnerability assessment should be completed when the system receives a public water system identification number (PWSID) to determine if the system qualifies for reduced chemical monitoring. 2. A lead and copper study must be completed when the when the system receives a public water system identification number. 3. An operations and maintenance manual, following the minimum outline from the State of Colorado New Water System Capacity Planning Manual, must be completed and made available to the water system administration or owner, and certified water treatment operator. The manual must be completed within three months after receiving a PWSID. Enclosed is a table of contents to be followed when developing the operations and maintenance manual. The approval is for the following: Groundwater Treatment Facility with Maximum Design Rate = 225-gpm = 0.06 MGD Hypochlorination Disinfection System Storage Tank = 300,000 -gallons 24" Chlorine Contact Pipe = 6,783-gallons/225-gpm X A/T factor 1.0 = 30 -minutes Ground Water Well = Willow Well All change orders and addendums must be submitted to this office in duplicate for approval. When approved, one copy will be retained and one copy returned to you. Once construction has begun on the project, a representative from the Department may conduct an interim construction inspection. Prior notice will be given to such an inspection. When construction is estimated to be within 60 days of completion, the project engineer must contact this Department. A representative of the Department may schedule a site visit to conduct a final construction inspection before the plant is placed on line. Upon completion of construction, a written certification from your engineering firm stating that the facility was built as approved by this office must be submitted to the Department. Approval of this proposed project is based only on engineering design and the facility's ability to provide safe potable water, meeting the Colorado Primary Drinking Water Regulations. Approval shall in no way influence local planning decisions. In accordance with the Colorado Primary Drinking Water Regulations, the water quality monitoring shall commence no later than at the time when the water system becomes Public, reaching 15 taps or serving twenty-five people for sixty or more days per year. You must notify this office in writing when the water system meets the definition of 15 taps or serves twenty-five individuals for sixty days per year so a Public Water System Identification Number (PWSID) can be assigned. Failure to notify the Division will result in a violation of the Colorado Primary Drinking Water Regulations. Under current regulation, when the water system becomes Public, it will be classified as a small water system requiring a minimum of the small water system water treatment certification in direct charge of the water treatment facility. The small water system certification combines the water treatment certification and Class 1 Distribution certification into a single test and certificate. Any point source discharges of water from your facility are potentially subject to a discharge permit under the State Discharge Permit System. Any point source discharges to state waters without a permit are subject to civil or criminal enforcement action. If this facility has any discharges without permits, you are required to contact the Water Quality Control Division, Permits and Enforcement Section, at (303) 692-3500, regarding permit requirements. If you have any questions, please call Robert Cribbs at (970) 248-7199. Sincerely, Robert Cribbs Environmental Protection Specialist Water Quality Control Division Enc.: Operations and Maintenance Manual Outline Tom Schaffer, P.E. West Slope Supervisor Water Quality Control Division CC: Mark Bean, Garfield County Planning Department Thomas A, Zancanella, P.E., Zancanella and Associates, Inc., P.O. Box 1908, Glenwood Springs, CO 81602 Dwain Watson, D.E., Technical Services Unit, WQCD Erica Kannely, Compliance and Data Management, WQCD R. Cribbs Operation and Maintenance Manual Table of Contents Item Page Number Facility Description Startup Procedures Normal Operation Procedures Maintenance Program Sampling and Analysis Schedules Staffing and Training Requirements Identification of Potential Risks to the Water Supply Safety Program Unaccounted Water Tracking Plan Available Resources for External Technical and Financial Assistance Emergency Operating Procedures Manufacturer's Manuals Water System Policies Budget and Rate Structure Water System Responsibilities Customer Responsibilities Cross -connection Control Customer Information or Public Education Customer Complaints Water Quality Violation Response and Notification a[110 Olvin FIRE • EMS • RESCUE May 12, 2001 Mr. Tom Zancanella Zancanella and Associates P.O. Box 1908 Glenwood Springs, CO 81601 RE: Cerise Ranch Subdivision, Fire Protection Water Supply Dear Tom: RECEIVED MAY 1 5 2001, I have reviewed the pump house design, utility plan, and meter pit/hydrant detail drawings including the revised pump house design drawings for the Cerise Ranch Subdivision. The system as indicated in the drawings is acceptable. The suction hydrant used for the system backup should be painted yellow with "SUCTION" stenciled on the bonnet. Please contact me if you have any questions or if I can be of any assistance. Sin re Bill Gavette Deputy Chief Cc: Mark Bean, Garfield County Planning Arno Ehlers, Garfield County Building Official Carbondale & Rural Fire Protection District 300 Meadowood Drive • Carbondale, CO 81623 • 970/963-2491 Fax 963-0569 ii���"RESOURCE ' RECEIVED NOV 0 7 2001 ■ ■11■■ ■ ■■■■ E N G I N E E R I N G I N C. Mr. Mark Bean Garfield County Building and Planning Dept 109 8th Street, Suite 303 Glenwood Springs CO 81601 RE: Cerise Ranch Phase 2 Final Plat Dear Mark: November 6, 2001 At the request of Garfield County, Resource Engineering, Inc. has reviewed the Cerise Ranch Phase 2 Final Plat submittal. We reviewed the technical aspects of the submittal for conformance with the Preliminary Plan approval and with generally accepted standards of engineering practice. Based on our review, we offer the following comments: 1. Silt fence should be constructed on Lots 25, 26 and 27 to protect the wetland areas west, south and east of the cul-de-sac. Silt fence should be constructed on west side of Bluestem Court south of Lot 23 to protect wetlands. This should be shown on sheets 9, 17 and 18 of the engineering drawings. 2. Debris flow structures should be shown on Lot 35 and 44 on sheet 9 of the drawings. 3. Condition of Approval No. 5, WWE Comment 10, requires that the building envelope for Lot 27 be removed from within the subsidence area or a detailed geotechnical analysis be completed to demonstrate the building envelope is buildable. This issue has not been addressed. 4. Condition of Approval No. 5., WWE Comment 14 requiring debris flow easements for Lots 35 through 44 has been completed. 5. Installation of additional well pumps and controls, water distribution system booster pumps and other appurtenances are required for Phase II. There was no information available regarding these items. 6. The Summary of Probable Construction cost should be revised to include costs for the following items: A. Earthwork and boulder retaining wall on Lot 31. B. Construction observation, construction surveying, construction administration, materials testing, and permitting. C. Miscellaneous water supply improvements listed in item 5 above. D. Water system air vacuum valve and vault. E. Water line, valves, hydrants, etc. for Bluestem Court Consulting Engineers and Hydrologists 909 Colorado Avenue ■ Glenwood Springs, CO 91 601 • (970) 945-6777 ■ Fax (970) 945-11 37 Mr. Mark Bean Page 2 F. Shallow utilities for Bluestem Court. November 6, 2001 7. Discussions with High Country Engineering indicate that some of the items listed in Item 6 above have been completed. All phase II items should be listed on the cost estimate and a new column created to show items completed. High Country Engineering must certify that this construction is complete. Please call if you have any questions or need additional information. Sincerely, RESOURCE EN INEERING, INC. Michael J. Erior'P.E. Water Resources Engineer MJE/mmm 885-4.0 mb cerise.885.wpd CC: Eric Tuin, High Country Engineering RESOUR ENGINEERING CE INC. ....."'RESOURCE ..... ■■■■■ E N G I N E E R I N G I N C. Mr. Mark Bean Garfield County Building and Planning Dept 108 8th Street, Suite 201 Glenwood Springs CO 81601 RE: Cerise Ranch Lot 52 Driveway Dear Mark: SUN 1 4 2004 GA}RFIE LD COI.I1\11-1, BUILDING & PLP•NNING June 9, 2004 At the request of Garfield County, Resource Engineering, Inc. (RESOURCE) has reviewed the revised design for a driveway to serve Lot 52 of the Cerise Ranch Subdivision. The submittal includes a cover letter to Mark Bean dated May 28, 2004, a letter from HP Geotech dated May 24, 2004, and design drawings dated April 22, 2004 and sealed by Frederick Tobias, P.E. on June 2, 2004. Based on our review, we believe that the proposed design meets the requirements of Plat Note No. 11 of the Cerise Ranch final plat and addresses the special considerations and design criteria approved in the final plat. In addition, it specifically addresses the RESOURCE review comments dated February 25, 2004. Please call if you have any questions or need additional information. Sincerely, RESOURCE,EI,GINEERING, INC. c Michael J.:,Erion, P.E. Water I source Engineer MJE/mmm 885-4.0 E:\Client\885\mb cerise lot 52 driveway 885.doc CC: Jeff Spanel Consulting Engineers and Hydrologists 909 Colorado Avenue ■ Glenwood Springs, CO 81 601 (970] 945-6777 ® Fax (970] 945-11 37 • Kter-Mountain Engineering Ltd. May 28, 2004 Mark Bean RECEIVED ,SUN 0 2 2004 Gi\RF!LLD CONN NG NTY BUILDING & PLI\ Garfield County Building and Planning Department 108 Eighth Street, Suite 201 Glenwood Springs, CO 81601 Re: Cerise Ranch Lot 52 Driveway Dear Mr. Bean: Inter -Mountain Engineering has reviewed the comments from Michael Erion of Resource Engineering, Inc. concerning the engineering design for the Cerise Ranch Lot 52 Driveway. These comments are dated February 25,2004. We have attempted to address each of the comments below: 1. The drainage structures for the roadway crossing must be sized to pass the 100 year flood flow with debris flow bulking. This analysis was conducted by High Country Engineering for the developer and an appropriate sized culvert is included in the approved drainage plan. In addition, the culvert was designed as an inverted U box culvert structure such that it spanned the drainage channel and avoided any wetland impacts. The US Army Corps of Engineers ' permit for the Cerise Ranch project was based on no impact at this road crossing. The Applicant must modify the culvert design to provide a clear span of the drainage channel and match the capacity provided in the approved drainage plan. Inter -Mountain Engineering has slightly adjusted the road alignment and has proposed the installation of two (2) 42" CMP culverts with headwalls matching the headwalls of the lower portions of the drainage channel. These 42" culverts carry an equal or greater amount of drainage flow than the 49"x33" culverts in the lower portions of the drainage channel; therefore they are sized to pass the 100 -year flood with debris flow bulking. 2. The proposed driveway cuts across a hillside, which was identified as a potentially unstable slope. The Applicant should submit evidence that the proposed design is satisfactory from a slope stability standpoint. Included in this packet is a letter from HP Geotech dated May 24, 2004 discussing slope stability issues and recommendations. The hillside north of the Cerise Ranch Road cul-de-sac and east of the initial segment of the driveway is characterized by significant ground water resources including a spring collection system and pipeline. We recommend that the applicant consult with Dennis Cerise regarding the location of the spring and pipeline facilities to insure that construction does not impact these facilities. J: \projects\ 1002 5\FILES\1ot521etter5-28-04. doc 8392 Continental Divide Road, Suite #107 • Littleton, Colorado 80127 • Phone: 303/948-6220 • Fax: 303/948-6526 77 Metcalf Road, #200 • Box 978 • Avon, Colorado 81620 • Phone: 970/949-5072 • From Denver Direct: 893-1531 The existing inlet structure for this spring collection system has been located on the plans and driveway construction will not interfere with it. 4. The proposed grading for the driveway extends beyond the 40 foot utility and ingress/egress easement. The applicant should submit evidence that they have permission from the effected lot owners, which includes lots 51, 53 and 54. Wintergreen Homes (Developer) still owns lots 51 and 53. Construction is fully contained within easement for this driveway on Lot 54. We believe we have sufficiently addressed these concerns and therefore have included 3 sets of sealed and signed plans for review and approval from the Garfield County Department of Building and Planning. Please call if you have any further comments or questions. Sincerely, Inter -Mountain Engineering Ltd. -/tW' Robert R. Yost, E.I.T. Cc: Michael Erion, Resource Engineering, Inc. J:\projects\ 10025WILES \1ot521etter5-28-04. doc MAY -25-2004 12:23 H -P GEOTECH Gtech HE"PW©RTH - PAWLAK GEOTECHNICAL May 24, 2004 Cerise Ranch c/o Wintergreen Homes Attn: Jeff Spanel Y.U. Box 1530 Avon, Colorado 81620 P.02/04 Hepwor.li•].'riw'hik CieoLech icai. lnc. 5020 (;< unr} R oxd 154 C.ilenwoud tirrrngs, lorn,1< 81601 Phone: 970,045-7Y88 F x: 970.945.6454 c1ra I: i rgen@hpgentecl..i_o tr job No. 104 301 Subject: Geologic Site Review for Proposed Driveway into Lot 52, Cerise Ranch, Garfield County, Colorado Dear Mr. Spanel: As requested, we have conducted a geol.ogic site review for the proposed driveway into Lot 52 at Cerise Ranch. The geologic site review is in response to item 2 presented in a review letter to the Garfield County Building and Planning Department by Michael Brion dated February 25, 2004 regarding the proposed driveway. A reconnaissance of the property was performed on April. 28, 2004 and published geologic literature and geologic maps of the area were reviewed in order to assess the project arca geology and its potential influence on the proposed construction. In addition, we have also reviewed CTL/Thompson's Geologic Hazard Evaluation (CTL/Thompson, 1998) for Cerise Ranch. 'flie following presents our conclusions and recommendations. Proposed Construction: Design drawings by Inter —Mountain Engineering, sheets l and 2, dated April 22, 2004 were provided for our geologic review_ The proposed driveway alignment to .Lot 52 will begin at the cul-de-sac at the end of Cerise Ranch Road and will extend uphill to the west. Much of the alignment (allows an existing dirt trail with a grade up to 12%. Go,:oiogic Setting: The project site is located in the northeastern part of the Carbondale Collapse Center, a collapse feature formed over the last 10 million years as the result of dissolution and flowage of evaporitc bedrock from. beneath the region (Kirkham and Others, 2002). The project area is underlain by the Pennsylvanian -age Eagle Valley Evaporite and surheial soil. deposits on the site consist of colluvium derived from Eagle Valley Evaporite and collapse debris containing basalt cobbles and boulders. Groundwater level appears to be near surface in the lower drainage area near Lots 51 and 5:3 and relatively deep beneath the remaining distan.cc to Lot 52. Geologic Assessment: The hillside that will be crossed by the proposed driveway ha.s a relaiively stable recent geologic history. The main geologic conditions that should be Parker 303-841-7119 • Colorado Springs 71.9-63.3-.5.562 • Silverthhorne 970-468-1989 MAY -25-2004 12:23 H—P GEOTECH Cerise Ranch May 24, 2004 Page 2 considered in project planning and design consist of potential construction related slope instability, potentially collapsible soils, potential sinkhole risks and surface drainage_ CONSTRUCTION RELATED SLOPE INSTABILITY The hillside along the proposed driveway alignment is steep to very steep with slopes ranging up to about 60°/x, The proposed cut and fill sections of 2 horizontal to I vertical should he adequate for dry slopes with surface erosion protection such as revegetation. Short retaining walls should be considered on the uphill side to reduce the cut slope heights to about 30 feet The proposed fill slope heights up to about 30 feet appear adequate. COLLAPSIBLE SOILS Colluvial slopes in the Roaring Fork River valley are known to have collapsible soils in some areas (Soule and Stover, 1985). Collapsible soils, when dry, provide acceptable support, but under conditions of post -construction wetting, they can undergo relatively larg: differential settlement. Surface drainage should be designed to not pond water adjacent to pavement areas and the roadside ditch should have an invert level below the road base layer. SINKHOLE POTENTIAL Sinkholes were not observed in the field during our reconnaissance of the property. :However, the presence of the Eagle Valley Evaporite beneath the project area indicates that there is a potential for subsurface voids at the project site. It is our opinion that the potential for subsurface voids and sinkholes at this site is low and similar to that in the rest of the building site in Cerise Rauch. SURFACE DRAINAGE P.03/04 Ephemeral drainage channels on the terrace slopes above the proposed driveway alignment could be a source of flash :flooding and sheetwash during periods of intense thunderstorm. precipitation. Small alluvial aprons at the mouths of these drainages appear to be geomorphically active. Alluvial aprons usually have poorly defined drainage channels and their surfaces could be subject to flooding and sheetwash. Potential flows from the hillside ephemeral drainages above the proposed driveway alignment should be evaluated as part of'the overall drainage plan for the project. ;lob No, 104 301 s leech MAY -25-2004 12:23 H -P GEOTECH Cerise Ranch May 24, 2004 Page 3 if you have any questions or require further assistance, please call our office. Respectfully submitted, HEPWORTH - PAWLAK GEOTECHNICAL, INC. ;> jze oeee/e, @53) Arthur D. Buck Engineering Geologist Reviewed by: Steven L. Pawlak, P.E. A] )i3/ksw References: CIL/Thompson, 1998, Preliminary Geologic Hazard Evaluation and US.L)A Soil Conservation Service Data. for Cerise Ranch, Gar field and Eagle Counties, Colorado, Job No. GS -2309, Report Dated March 26, 1998. Hepworth-Pawlak Geotechnical, 2000, Percolation Testing, Proposed Cerise Ranch Residential Development, Gar fr.eld County, Colorado, Job No. 100 106, Report Dated January 26, 2000. Kirkham and Others, 2002, .Evaporite Tectonism in the Lower Roaring Fork River Valley,West-Central Colorado, in Kirkham, R.M., Scott, R.R. and Judkins, T.W. eds., .Lula Cenozoic .Evaporite Tectonisnz and Volcanism in West Central Colorado: Geological Society of America Special Paper 366, Boulder, Colorado. Kirkham, Robert M. and Widmann, Beth L., 1997, Geologic Map of the Carbondale Quadrangle, Garfield County, Colorado: Colorado Geological Survey, Open File Report 97-3. Soule, J.M. and Stover, I3.K., 1985, Surficial Geology, Geomorphology and General Engineering Geology of harts of the Colorado River Valley, Roaring Fork River Valley, and Adjacent Areas, Garfr.eld County, Colorado: Colorado Geological Survey Open -File Report 85-1. Job No. 104 301 P.04/04 '�'G tech TOTAL P.04