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Hazeltine/Road Runners Rest IllBrinkmann-Woodward Gravel Pits Lining Project -Design Technical Memorandum <br />Denver Water <br />August 2003 <br />Section 2 -Subsurface Conditions <br />2.1 General <br />The general subsurface profile at the site consists of alluvial soils over bedrock. The <br />subsurface conditions are described in the Geotechnical Data TM (GEI, 2000) and the <br />Addendum to Geotechnical Data TM (GET, 2003) and summarized below, starting from the <br />ground surface. Approximate boring locations are shown on Figure 3.2. <br />2.2 Fill <br />Fill was encountered in the southwestern portion of the Hazeltine Pit. The fill in this area <br />extended from the ground surface to about 30 feet in borings B-303 and B-305. The fill <br />consisted primarily of lean clay or lean clay with sand and was classified as CL according to <br />the Unified Soil Classification System (USCS). The Standard Penetration Test (SPT) N-values <br />in this material range from 3 to 9. <br />Fill was also encountered at the southeastem end of the Brinkmann-Woodward Pit. The fill in <br />boring B-406 was about 7.5 feet thick and consisted mostly of silt with 15 to 20 percent widely <br />graded sand, and about 5 to 10 percent gravel. <br />2.3 Alluvium <br />The alluvium at the site consists of two distinct layers, the Post-Piney Creek Alluvium and the <br />Louviers Alluvium. <br />Post-Piney Creek Alluvium was generally encountered from the Bound surface to depths of <br />5.0 to 18.0 feet. The Post-Piney Creek Alluvium encountered in the borings varied from silty <br />sands with some gravel to sandy clays. Generally, this material has between 20 and 80 percent <br />fines, 15 and 70 percent sand, and between 5 and 20 percent gravel. The Post-Piney Creek <br />Alluvium was typically soft to stiff or loose to medium dense, slightly moist to moist, tan to <br />light brown to dark brown to gray, and classified as CL, ML, SM, or SC according to the <br />USCS. <br />Louviers Alluvium was encountered below the Post-Piney Creek Alluvium, below the fill, or at <br />the ground surface, and extended to depths from about 11.0 to 59.0 feet below the existing <br />ground surface, which corresponds to El. 4963 to El. 5019. The Louviers Alluvium <br />encountered in the borings generally varied between narrowly to widely graded sands, <br />GEI COnSUltantS, Ine. 4 o;oao o;-m-;ua-~iude~. nz,n rei <br />