Laserfiche WebLink
The soils encountered during drilling at the site included interbedded deposits of <br /> silty sands, sandy silts and silty clays. These alluvial sediments blanket the San <br /> Joaquin Valley Flood Plain to depths of several hundred feet. The San Joaquin <br /> Valley occupies an area of 13,500 square miles and is the largest groundwater <br /> basin in the State (McCullough, et al, 1975). <br /> The depth to groundwater on the subject site, based on the results of the present <br /> investigation, is approximately 25 feet. The groundwater flow direction, based <br /> on the results of previous investigations in the site vicinity (see Section 4.2) is <br /> northerly to northeasterly. <br /> 3.3 Drilling Methods <br /> All soil borings were drilled on November 20, 1992 by a mobile drilling rig using <br /> hollow-stem augers. The four soil boring locations, designated B-1 through B-4, <br /> are identified on Figure 2. <br /> At each boring location, the ATEC site geologist prepared a geologic log, <br /> describing the soils penetrated and noted the pertinent sample information. Soils <br /> encountered during drilling were classified in accordance with the Unified Soil <br /> Classification System (USCS). The geologic boring logs are presented in <br /> Appendix B. <br /> The soil cuttings and groundwater effluent generated from each of the borings <br /> were placed in four sealed, steel, California State Department of Transportation <br /> approved 55-gallon drums and stored in the site parking area (Figure 2). Each <br /> drum was marked with a California state approved, hazardous materials label. <br /> 4 <br />