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<br />Deere & Ault Consultants, Inc. - Dam & Reservoir Projects <br /> <br />Page 40[8 <br /> <br /> <br />Chase Gulch Dam is a lOO-foot high concrete faced rockfill dam. <br />The photo I'llustrates rockfill placement and initial construction of the face slabs. <br /> <br />D&A staff provided complete engineering, design, and construction engineering services for a <br />concrete-faced rockfill dam in the mineral belt area .of the Colorado Front Range near Central City, <br />Colorado. <br /> <br />The dam site is at an elevation of approximately 8,700 feet. The dam impounds water on Chase <br />Gulch, a tributary to North Clear Creek. Preliminary designs were prepared for both a concrete- <br />faced rockfill dam and a roller-compacted concrete dam. The concrete faced rockfill embankment <br />dam was selected as the most suitable for the site conditions and available construction materials. <br /> <br />Dam design was completed in the fall of 1992. Construction began in February 1995, and was <br />completed in December 1995. The dam consists of a lOO-foot high, quarried, rockfill embankment <br />with upstream slopes of 1.4: 1 (horizontal to vertical) and downstream slopes of 1.3: 1 with a crest <br />width of 25 feet. A concrete toe plinth and upstream concrete face provided the water barrier. A <br />foundation grout curtain constructed through the toe plinth intercepts potential under-seepage. <br />Appurtenant structures included: <br /> <br />· A 30-inch diameter outlet pipe through the rock foundation with an upstream guard gate <br />and downstream valve <br /> <br />· A pump station to convey raw water from the dam to the water treatment plant <br /> <br />· A chute-type spillway excavated in the rock around the left dam abutment to pass flood flows <br /> <br />Client: City of Central <br />Project Cost: $5.2 million <br /> <br />Design Build Slurry Walls for Gravel Pit Reservoirs <br /> <br /> <br />Soil-bentonite slurry wall constructed <br />with a long-stick excavator. <br /> <br /> <br />The Siebring Reservoir constructed in 1991 was <br />the First gravel pit reservoir in the state of <br />Colorado to be lined with a slurry wall. <br /> <br />Deere and Ault Consultants, lnc. (OM) is the leader in design-build of slurry walls for gravel pit <br />reservoir projects. Our group of professional engineers has designed more of these facilities in the <br />State of Colorado than all other firms combined. Our engineers have the experience to focus our <br />investigations and design efforts on the site factors important for constructing successful slurry wall <br />reservoirs. Our designs incorporate the site specific soil and bedrock conditions to develop <br />appropriate key trench depths in the bedrock and practical backfill mixes considering available <br /> <br />file://X:\0290 Delta Sanrl IV Gr~v~l\()d-()()'/() Pit PV~"'_H'c~n"\U~Trlr""'ll~" U"_~~_\n,",,,,_,,, 0_ A nl <br /> <br />1 1 /1 '1"\ A("\ ~ <br />