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Item A: Public Hearing onMetro Plan Amendment (Delta Sand and Gravel)
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Item A: Public Hearing onMetro Plan Amendment (Delta Sand and Gravel)
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6/9/2010 12:58:15 PM
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12/7/2006 11:34:08 AM
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City Council
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Agenda Item Summary
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12/12/2006
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<br />Deere & Ault Consultants, Inc. - Dam & Reservoir Projects <br /> <br />Page 3 of 8: <br /> <br />constructed. <br /> <br />Other Engineering services provided include: geotechnical investigation with soil and bedrock <br />sampling and testing, field permeability testing of the bedrock, borrow investigation studies, slope <br />stability and seepage analysis, development of construction drawings, development of technical <br />specifications, and construction related engineering services. <br /> <br />Client: Lafarge West, Inc. <br />Project Cost: $1 million <br /> <br />Cat Reservoir <br />Adams County, Colorado <br /> <br /> <br />Initial compacted embankment Slope liner construction along the mine high wall. <br /> <br />Cat Reservoir is a below grade, lined, water storage reservoir being constructed in conjunction with <br />aggregate mining activities. It is a design build project and is located near the confluence of Clear <br />Creek and the South Platte River in Adams County, Colorado. The reservoir liner is a 7700 feet long <br />compacted earthen embankment slope liner constructed from on-site soils. Design challenges <br />include coordinating the aggregate mining\highwall design and reservoir construction along existing <br />utilities, including a 42" diameter PCCP force sewer main. Highwall and compacted embankment <br />slope liner stability challenges were compounded by the presence of a relatively thick and soft mud <br />lens. <br /> <br />The site is underlain by fractured permeable claystone bedrock. Under OM guidance and to help <br />minimize the project construction costs the liner is being constructed in two phases using an <br />observational approach. Infiltration rates will be measured after Phase I is complete. Once <br />completed and, if required, remaining local seepage areas will be sealed during Phase II in order to <br />pass the state seepage criter:ia. <br /> <br />Final reservoir storage volume is projected to be approximately 2,500 acre-feet. <br /> <br />Client: Cat Construction and Denver Water Board <br />Project Cost: $1.6 million <br /> <br />Chase Gulch Dam <br />Central City, Colorado <br /> <br />file://X:\0290 Delta Sand & (Tr~vel\04-0()?()Plt F.Yn~nC;:l()n\H"r1nl~li(' R~rrlPl"\npp"p Rr A 111 <br /> <br />1 1 /1 I'") nnt:. <br />
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