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. 0` • - a-' - �sa'.a a . t •,'i� _ 5 b, .s�? 'r. ,..... n ' .,sa.'PREMIERE " IM72111A0,1'." , <br /> , <br /> WOC contracted Western Guo-En,ineers (wEGE) on November 14,1988 to <br /> conduct a full site assessment. <br /> On November 15, 1988, personnel fro; 'SC and WEGE visited the site. <br /> Also on that same day, WEGE consul; i with Diane M. Hinson, R.S. , <br /> of the San Joaquin County Public Health Services, Environmental <br /> Health Division (PHS/EHD) and prepared '.he necessary work plan and <br /> permit applications to perform on sirs exploratory borings and <br /> monitor well construction. <br /> Under the direct supervision of a WEGE geologist, Hogate <br /> Exploration drilled and sampled three exploratory borings (SB-1, <br /> S$-2, 5B-3) from ground level down to the first ground water <br /> encountered .ee FIGURE 3). Based upon 1) the chemical results of <br /> the ground water and native soil from these borings; and 2)the <br /> ground water direction; three additional on site borings would be <br /> sampled and drilled for the purpose of constructing monitor wells <br /> (MW-1, MW-2, MW-3). These borings/monitor wells were drilled <br /> during the week of December 1-9, 1988. A . complete report, "SITE <br /> ASSESSMENT" dated February1{3 <br /> 1989 w asnese <br /> p rated to WOC <br /> and the <br /> proper regulatory agencies (PHS/EHD , and Regional Water Quality <br /> Control Board, Central Valley Region (RWQCB-CVR)) concerning these <br /> initial steps of the assessment (Phase 11). <br /> The recommendations included in that report are as :Follows: <br /> 1) Obtain the necessary permits to sample , drill, and <br /> ( construct seven additional on/off site monitor wells <br /> in order to determine the lateral extent of ground <br /> water contamination. <br /> 2) Prior to installing the new underground storage <br /> tanks and clean fill (pea gravel) within the <br /> existing excavation, place a four inch slotted <br /> "PVC" well at the northeast corner of the <br /> excavation. This well can later be used as a vapor <br /> monitoring, recovery, or fluid injection well. <br /> 3} As in 2) above, place a six inch slotted "PVC" well <br /> in the northwest corner of the excavation. This <br /> well can later be used as a monitor well for <br /> sensors, floats. etc. <br /> 4) Construct a remediation/treatment compound at the <br /> northwest corner of the site with a security fence <br /> and gate. <br /> G <br /> v�nre� <br />