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INTRODUCTION <br />This report summarizes construction observation results for thi <br />assurance testing conducted during the construction of the Staff <br />Information contained within this report was collected as part <br />c <br />engineering services that were provided by Deere and Ault Co: <br />slurry wall construction. The slurry wall was constructed by F <br />contract with Lafarge North America, Inc. and Albert Frei & S <br />preparing to mine gravel aggregate at the site. Upon completi( <br />will be used as a water storage reservoir. <br />Construction of the Stagecoach slurry wall began in early Octe <br />December 2005. The construction consisted of lining a propos <br />7,100 feet of soil-bentonite slurry wall. The goal of the slurry <br />interaction between the proposed gravel pit and the surroundin <br />hydraulic interaction aids mining efficiency in two ways: 1) rep <br />during mining operations, and 2) by reducing draw down effec <br />Upon completion of the mining activities, the final goal of the <br />a primary low permeability liner for a below grade water storal <br />The slurry wall was constructed using a design/build approach, <br />construction included on-site quality control and observation o <br />Irwin Construction supplied the labor, equipment, and material <br />PROJECT DESCRIPTION <br />The project site is located near Henderson, Colorado, and is bo <br />east, the South Platte River, on the west, and is roughly 1,000 fi <br />site is more particularly described as being located in Section 2 <br />67 West of the 6th Principal Meridian, Adams County, Colorac <br />(Figure 1). <br />Prior to slurry wall construction activities, the site was used foi <br />surface of the site is relatively flat; however, it has two distinct <br />of the property is roughly 10 to 12 feet higher than the western <br />occurs near the center of the site. <br />The project area is located approximately 20 miles east of the e <br />Front Range. Regional geologic mapping of the area (Trimble; <br />bedrock at the site is the Denver Formation. The Denver Form <br />of claystone, siltstone, and conglomerate with the claystone an( <br />montmerillonitic clay. Bedrock at the site is overlain by alluvii <br />Alluvium and some Broadway Alluvium. <br />Trimble, D. and Machette, M., United States Geological Survey, G <br />Greater Front Range Area, Front Range Urban Corridor, Colorado, <br />- 1 -