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Fuller Mobile Home Park 365 E. Louise Ave'., Lathrop, California June 5, 1996 Phase III Site Remediation Feasibility Study Work Plan Page: 2 L five and ten feet below ground level and a groundwater sample was bailed from each boring L through a stainless steel screen inside the augers. B-5 soil samples were ND (None Detected), but the groundwater sample had BTEX contamination. B-6 was ND for both soil and water. LMonitoring well MW-4 was installed in the sidewalk of Bizzibe Street in the apparent down- gradient direction. Laboratory soil samples were obtained at five, ten and twenty-five feet below ground level (Tables 1 & 2). On December 21> 1994 after receiving the analytical results from the previous borings, WHF L drilled and installed three monitoring wells, MW-5, 6 and 7. Each was 25 feet deep and soil samples were taken at five and ten feet. All soil samples tested "ND" (Table 1). Monthly depth to water readings are being recorded and the groundwater gradient calculated for each L month. The past gradients have been irregular, probably due to the fact that the gradient is extremely flat, and the lithology is probably affecting stabilization of the minor fluctuations across the site. t� On February2 & 5, 1996 WHF, Inc. in conjunction with the C-57 licensed contractor Frontier J Drilling, destroyed the abandoned water well (Figure 2). This well was within a groundwater L contamination plume associated with leaking UST's, and was directed to be closed by San Joaquin County Public Health Services, Environmental Health Division (SJC PHS/EHD). All field activities were witnessed by personnel from SJC PHS/EHD, L L 3.0 Work Plan This work plan was developed to! define the easterly limit of soil contamination, determine aquifer hydraulic properties (pump test), and investigate the feasibility of various remediation methods for this site. 3.1 Defrne Easterly Limit of Soil Contamination L To define the east limit of soil contamination, WHF will conduct a boring between MW-3 and the property line fence (Figure 2). Spoon samples wiII be collected at one foot intervals above and below the water table. Groundwater samples will also be collected from the boring before it is grouted. Depth to water is anticipated between 9 and 10 feet below ground level (b.g.l.). Boring shall be accomplished by a C-57 licensed contractor using a 3-inch auger. Soil Lsamples shall be collected with a hand operated slide-hammer spoon sampler with 11/2" x 6" brass sleeves. Decontamination procedures (tri-sodium phosphate wash) shall be followed before and between sampling intervals to prevent any cross-contamination. Representative groundwater samples shall be collected with a disposable Teflon bailer.