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Fuller Mobile Home Park <br />' 36S E. Louise Ave, Lathrop, California February 23, 1996 <br /> Phase III Site Remediation Feasibility Study & Work Plan Page: 2 <br /> I <br />' five and ten feet below ground level and a groundwater sample was bailed from each boring <br /> through a stainless steel screen inside the augers B-5 soil samples were ND (None Detected), <br />' but the groundwater sample had BTEX contamination B-6 was ND for both sod and water <br /> Monitoring well MW-4 was installed in the sidewalk of Bizzibe Street in the apparent down- <br /> gradient direction Laboratory soil samples were obtained at five, ten and twenty-five feet <br /> below ground level (Tables I & 2) <br /> On December 21, 1994, after receiving the analytical results from the previous borings, WHY <br />' drilled and installed three monitoring wells, MW-5, 6 and 7 Each was 25 feet deep and soil <br /> samples were taken at five and ten feet All soil samples tested "ND" (Table 1) Monthly <br /> depth to water readings are being recorded and the groundwater gradient calculated for each <br />' month The past gradients have been irregular, probably due to the fact that the gradient is <br /> extremely flat, and the lithology is probably affecting stabilization of the minor fluctuations <br /> across the site <br />' On February2 & 5 1996 WHF Inc in conjunction with the C-57 licensed contractor Frontier <br /> J <br /> Drilling, destroyed the abandoned water well (Figure 2) This well was within a groundwater <br /> contamination plume associated with leaking UST's, and was directed to be closed by San <br /> Joaquin County Public Health Services, Environmental Health Division (SJC PHS/EHD) .All <br /> field activities were witnessed by personnel from SJC PHS/EHD <br />' <br /> 3.0 Feasibility Study & Work Plan <br /> This feasibility study and work plan was developed to investigate the feasibility of the <br />' following remediation methods for this site, close the southern contamination <br /> boundary, and deternune aquifer hydraulic properties <br />' 31 Remediation Methods For Investigation <br /> Bio Vent With Air Spargtng <br /> 1 <br /> Excavation With De-Watering <br />' . In-Situ Natural Bio-Degradation <br />' 3.2 Down Gradient Monitoring Well Installation r <br /> San Joaquin County has verbally directed WHF to install an additional monitoring well, <br /> MW-8, at this site, because the groundwater contamination plume has not been define <br /> 1 <br />