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- 7 P Julian Munoz WEISSASSOCLATES , 15 October 1487 1' other three tanks passed. Since Tank #3 indicated a confirmed fuel leak, Safeway stores requested that P1 remove the four tanks and contracted WA to determine the extent of fuel hydrocarbons in the Subsurface. SUMMARY OF PHASE I - TANK REMOVAL AND SOIL BORING PI removed the tanks between 6 July and 10 July 1987. Hydrocarbon staining and odors were noted in the tank backfill. Analysis of a water sample collected from the tank excavation indicated 1.1 parts per billion (ppb) xylenes. Analysis: of two samples of the tank backfill material remaining in the excavation indicated 130 parts per million (ppm) and 180 ppm total fuel hydrocarbons (Tr'HC). Locations of the backfill samples are shown on Figure 2. The disposition of the tank backfill material needs to be determined for final tank excavation closure. Detailed results of the tank excavation sampling and a proposal and cost estimate for treatment of the backfill will be forwarded to you shortly, Hydrocarbon vapors were detected in both unsaturated and saturated soil during drilling of the soil borings, but laboratory analysis of soil samples collected from the boreholes indicated that hydrocarbons were only present in saturated soil from boring B-2, southwest of the tanks (Figure 2). SCOPE OF WORK - PHASE :I Since the results of Phase I indicated that hydrocarbons were present in the subsurface, the San Joaquin Local Health District (SJLMD) requested monitoring well installation to determine the extent of hydrocarbons in ground water and unsaturated soil. Therefore, the scope of work for Phase 11 included; o Drilling three borings, collecting soil samples at 5-ft intervals, y g... er.--.--borin _and-installing three 4-in. diameter anal zin one -sample -..P g __ _...... _. _... __,_.. ground water monitoring wells in the boreholes; MEMOm..- ..wa.n..nmursn�w�r®ra�eesn��srwr