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:,y s P 275 Grantline Rd. Page 4 of 7 dispensing lines . Sample SS-11 was collected at a depth of 8 to 9 feet below grade and northeast of the tank excavation pit to serve . as a background sample, Sample SS-12 was collected from an area east of the product lines, at a depth of 3 to 4 feet below grade, and also serves as a background sample. Two samples of the pump island area were also taken, PI-1 and PI-2, at depths of 4 feet and 2 feet respectively. A large cobble was encountered at a depth of 2,5 feet in the location of the PI-1 sample and a sample was Collected at a depth of 4 feet below grade. The product line and pump island excavations were backfilled and resurfaced on July 26,1990 after analytical results were received. LABORATORY P.NALYTICAL RESULTS-SOILS Soil samples# .1 through # 6, 9 -A and #. 11 were analyzed for Total Oil and Grease (Standard Method 503 D & E SS--12 were analyzed for TPH (as gasoline)/BTEXs (EPA through 5030/8015 and 8020) ; SS--11 was also analyzed for Oil and Grease. The analytical results indicate concentrations of Oil and Grease, TPH (as gasoline)/BTEX to be below test method detection limits of 50 parts per Million (ppm) , 2.5 m and 5 near er billio (ppb) e he respectively in ?3. of the 14 samples collec ed paris Only samplenS-10 Product lines, revealed a concentration of TPH (as gasoline) of 2.6 ppm, 0,1 ppm above the detection level for TPH (as gasoline) . A BTEX concentration of 9.8 ppb was indicated also; this concentration of BTEX was contributed by Total Xylenes, no concentration of Benzene, Toluene or Ethylbenzene was detected. Total Xylenes are often a common component ofresidual gasoline contamination found in shallow or surface soilsnear pump islands or product lines. These concentrations of TPH (as gasoline) and BTEX do not appear to pose a threat to the groundwater encounte red 8 feet deeper on the site. LABORATORY ANALYTICAL RESULTS-PIT WATER Analytical results of the grab sample of the concentrations of TPH a5 pit water indicate ( gasoline) EPA Method 5030/8015) of ] ,$_.... APm, BTEX (.EpA.._Me.tnod...__602)---concentrations---of - 7.-5....ppb .. Oil and Grease. (Standard Method 503 A & E) concentrations of 2.$ ppm, and a 1,2-DichZaroethane concentration of 4.2 ppb. These levels of contamination are above state and local corrective. action . levels for contaminated groundwater and will. have to be remediated (cleaned up) to acceptable standards. The addresses this remedial action plan. attached proposal SUMMARY OF FINDINGS l• . in general, a brown and grayish--brown, dry, stiff, clay und*y.i.ies the site to a depth of approximately 2 feet. A`