Laserfiche WebLink
Borings drilled at two sites along Fremont Avenue, approximately 1/2 mile west and 1/2 <br /> mile northeast of the East Miner site, encountered similar materials to depths of 50 1,: <br /> 60 feet below groun:: surface (bgs). Silty sands were encountered 'between 6t' -ind 70 <br /> feet, bgs. <br /> 2.43 GROUNDWATER OCCURRENCE <br /> At the former Chevron site at the intersection of Fremont Street and Windsor Avenue, <br /> groundwater was first encountered at about 40 feet below ground surface in a silty clay <br /> (EA, 1990). Based on water Ievel measurements and estimated groundwater gradients <br /> (EA, 1990) it appears that this water may have been perched above the water table. A <br /> stable water table was encountered approximately 70 feet below ground surface in a <br /> sand. <br /> At the Apache Plastics site (2050 East Fremont St.),groundwater was first encountered <br /> in a sand about 63 feat bgs (Western Geologic Resources, 1989). <br /> Groundwater maps produced by the San Joaquin County Flood Control and Water <br /> Conservation District (SJCFCWCD) (Spring 1990) suggest that water may be encoon- <br /> tered at a depth of about 70 feet bgs in the area of Plant 33. <br /> 2.4.4 GROUNDWATER FLOW <br /> Plant 33 is located within an area where groundwater is extensively developed by high- <br /> capacity well;.. Nearly all of these wells are several hundred feet deep and pump water <br /> from sands and gravels below about 200 feet bgs. The large withdrawals from these <br /> depths have created an extensive cone of depression, shown on the SJCFCWCD maps. <br /> r Lateral groundwater flow in this area is oi:en controlled by the locations of the nearest <br /> pumping wells. Water levels in wells at the Apache Plastics and Chevron sites along <br /> Fremont Street suggest generally southwestward flow in tate 1990. At the Plant 33 <br /> location, flaw directions may be affected by the three Del Monte. process water wells, <br /> located near the intersection of North Filbert Street and East Miner Avenue, that to- <br /> gether pump approximately 2,000 gal/min (Del Monte, personal communication 1991). <br /> Groundwat--r flow is therefore expected to be generally to the west cr southwestward at <br /> the East Miner Ave.site. <br /> sF0316051WpW02.51 2-7 <br /> 11, 111,11 11 111; al <br /> _�... s++�Rr�1117dnnr�- <br />