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<br />III. SITE CONDITIONS <br />3.01 Physiography and Land Use <br />The site is located northwest of downtown Greeley between 25`h and 35ih Avenues, <br />immediately south of the Cache La Poudre River. The site is bounded by the 35'" Avenue <br />Drainage Ditch on the west side, other existing gravel pits along the western half of the south <br />side, and by gravel mining operation areas (stockpiles and dewatering ditch) along the eastern <br />half of the south side and along the east side. The site is a reclaimed sand and gravel mining <br />operation and is currently under mining permit. Lafarge operates an active mine (35's <br />Avenue Mine) located west of [he site. The site lies within the boundaries of the Parcel "A" <br />property as defined in the ALTA Survey. Within the property, two reclaimed pits have filled <br />with water, creating an east and west pond that are separated by an embankment. A dirt road <br />exists along the perimeter of both ponds. <br /> 3.02 Site Topography and Drainage <br /> The ground surface, where not significantly disturbed by mining activities, is relatively flat, <br /> gradually sloping eastward with 4 fr of overall relief from El. 4669 to El. 4665. The <br /> maximum measured water depth in the existing ponds is 29 ft. The largest topographic highs <br /> are two gravel and sand stockpiles up to 45 ft high, existing on the south side of [he site. <br /> Reclaimed backfill slopes extend from the original ground surface to the floor of the ponds. <br /> The water surface in the ponds is typically 10 to 12 ft below the original ground surface. An <br /> approximately 5 to 10 fr high downward slope exists from north perimeter road to the Cache <br /> La Poudre River. Drainage and dewatering ditches are found along the western and eastern <br /> boundaries of the property. The 35's Avenue Ditch on the west side serves as a major storm <br /> water drainage ditch for the City of Greeley and must remain operational during and after <br /> slurry wall construction. <br /> 3 <br />03 <br />i <br />l G <br />l <br /> . <br />ona <br />eo <br />ogy <br />Reg <br /> The regional geology consists of fluvial surface deposits overlaying sedimentary bedrock. <br /> Fluvial deposits vary in thickness, tending to be thicker near the Cache La Poudre River. <br /> Surface deposits are mainly composed of fine to coarse alluvial sands. The bedrock is <br /> Cretaceous-age sedimentary rock of the Laramie Formation, which typically consists of <br /> claystone, shale, sandstone, and occasional coal seams. These sedimentary rocks were <br /> deposited during the Cretaceous Period as a large inland sea covered the area. <br />i <br />t <br />~~ <br /> <br /> <br />