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• `"WI PRIVILL''Gtl) & CONFIDENTIAL February 1997, Follow-Up Phase II Subsurface Investigation Building Analytics completed a Follow-up Phase H Subsurface Investigation in February 1997, which included the installation of three monitoring wells. The following is a .- summary of the findings from the expanded investigation: • The groundwater flow direction appears to be to the northeast, with a hydraulic gradient of 0.0025; • TPH-g at levels up to 1,300 ppm, and benzene at levels up to 0.39 ppm, were detected in the soil samples collected from Boring B2, at depths between 35 and 55 feet bgs; • TPH-g and BTEX were not detected in groundwater samples collected from MW- 1 or MW-3; -� • Benzene was not detected in the groundwater sample collected from MW-2; • TPH-g (1.6 ppm), ethylbenzene (120 ppm) and xylenes (370 ppm) were detected in the groundwater sample collected from MW-2; and • Methyl-tert-butyl ether (MTBE) was not detected in any of the soil or groundwater samples collected. r WORK PLAN The comments received from the San Joaquin County Public Health Services (SJCEHD) have been incorporated into this Work Plan. The revised scope of services for this Follow- up Subsurface Investigation consists of the following services: • Revision of Health and Safety (H&S) Plan; • Additional assessment of subsurface soil conditions beneath the subject site to further investigate the potential source of contamination; • Investigation of on-site groundwater conditions to further assess the extent of the known groundwater contamination; • Chemical analyses of soil and groundwater; and • Survey of the newly installed monitoring well. In order to accomplish the above-described objectives, Building Analytics proposes to conduct the following services: Health and Safety Plan Revise the existing H&S Plan to provide all field personnel with an understanding of the potential chemical and physical hazards that exist, or which may arise, during the implementation of the project. The H&S Plan describes the procedures to be followed in order to reduce employee exposure to potential health hazards which may be present at the project site. The emergency response procedures necessary to respond to such hazards are also described in the H&S Plan. Only those personnel who have successfully completed a 40-hour H&S training course, fulfilling the initial training requirements as specified in OSHA's interim regulation for hazardous waste operations (OSHA 20 CFR 1910.120), will be assigned to the project. V 2 197501-WFB.Stockton Workplan V