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k <br /> Julian Munoz ES <br /> J ali 2 v lss ASSOCLAT <br /> March 30, 198E <br /> 4) Analyze fo'xr of the samples for total pet.oleum hydrocarbons (TIM by <br /> oll <br /> modified EFA Method 8015, gas chromatography with flame ionizaton. <br /> detection (GC/FID), at Canonic Environmental Services of Stockton, <br /> California (CES). <br /> 5) Pleasure the depth to ground water in monitoring wells 1113-1 throuSh <br /> MW-3 and prepare a ground water elevation contour map. <br /> 6) Report the results of this phase of the investigation. <br /> This report describes sampling procedures and presents analytic results, <br /> conclusions and a proposal for final closure of the excavation. <br /> S AI.IPLI NG <br /> Before pumping started, water filled the excavation to about 8 ft below <br /> ground surface. The water was pumped to the sanitary sewer and tcmporary <br /> shoring was secured in the excavation. Eight native soil samples were then <br /> collected from beneath the concrete slab near the ends of the former tank- <br /> (Figure 1). <br /> The slab is about 13 inches thick. Steam cleaned brass tubes <br /> e native soil about 6 to 12 inches below holes bored <br /> were hand-driven into th <br /> in the slab. The tubes were sealed with aluminum foil, plastic end caps and <br /> duct tape, labeled, and refrigerated until delivery under chain of custody to <br /> CES for analysis. As approved by pave Carls of the SJLHD, only the four <br /> corner samples were ar -lyzed. <br /> ANALYTIC RESULTS <br /> at CES for TPH by GC/FID with a detection limit of <br /> Samples were analyzed <br /> one detected) <br /> 10 parts per million (ppm). Analytic results ranged from ND {n56 <br /> — ---- - <br /> for sample SL-A-l' , from beneath the northwestern-corner_of the-slab_,—to <br /> corner. Analytic <br /> ppm for sample SL-D-0.5' , from beneath the southwestern <br /> results for all samples are presented in Table I. <br />