Laserfiche WebLink
KLEINFELDER <br /> 4 SOLID WASTE ASSESSMENT TEST RESULTS <br /> 4.1 SITE GEOLOGY <br /> In the area of Foothill Landfill the only exposed sediments are from the Mehrten <br /> Formation. Outcrops within the landfill and approximately 1500 feet outside the current <br /> landfill perimeter were mapped, as shown on Plate 4-1. Specific lithologies observed are <br /> described below: <br /> Sandstone: Grey to dark grey or brownish grey weathering light grey to <br /> buff grey, commonly medium to coarse grained although fine <br /> grained sections do occur. Visible sand grains are comprised <br /> of 60-70% mafic material, as mineral fragments or rock <br /> fragments. Sand is partially consolidated therefore the sand <br /> crumbles with finger pressure. Coarser grained sands are <br /> structurally massive but finer grained sands may exhibit <br /> laminated bed or crossbedding. <br /> Gravel/Very Coarse Sand: <br /> Light grey to brownish-grey gravel layers may occur within <br /> sand units. Occasionally gravel may occur within a finer silty <br /> bed. Clasts ranged from 0.5 to 1.5 inches across although some <br /> sections are mostly very coarse sand. <br /> Siltstone: Brown to reddish-brown weathering light buff to white. <br /> Frequently finely laminated or crossbedded. The distinguish in <br /> feature of fine grained sediments in the area is the occurrence <br /> of distinct fine black grains evenly distributed throughout the <br /> rock. <br /> Claystone: Brown to reddish-brown or pink weathering pinkish buff, buff <br /> to white. Occasionally very fine laminations and crossbeds can <br /> be seen. Black grains very common. In one area black <br /> plantlike material was visible within a pink claystone. <br /> FOOTHILL 22 <br />