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Project 113-26-04, 05, Page 10 <br /> November 17, 1995 <br /> Table 2: Well Elevation Data <br /> Contra Costa County Motor Pool <br /> FMWMW-2 <br /> W D : #£ . . 3 ' fir-127 2802 7.02 21.00 <br /> 25 28.16 6.97 2119 <br /> MW-3 27 2928 807 21.21 <br /> MW-4 24 2706 6.06 2100 <br /> MW-5 15 27.46 637 21.09 <br /> MW-6 15 2725 6.19 2106 <br /> MW-7 15 27 27 6.33 2094 <br /> MW-8 20 2731 622 2109 <br /> From the survey and depth to groundwater measurement data, the site groundwater <br /> on September 25, 1995 was found to be flowing approximately due north (downhill) <br /> with an average gradient of 0 00277 <br /> IV SAMPLE ANALYTICAL RESULTS <br /> Soil Sample Analytical Results <br /> All soil and groundwater samples were analyzed at a State Certified Environmental <br /> Laboratory (McCampbell Analytical, #1644) The analyses for soil and groundwater <br /> samples were by EPA methods 5030/8015 modified for TPH as gasoline and 8020/602 <br /> for BTEX <br /> One soil sample was analyzed from each of the borings B-8 to 21, excepting B-9 and B- <br /> 19 (Table 3: Soil & Groundwater Sample Analytical Results) One soil sample from <br /> each of MW-5 and MW-7 was analyzed, as were two samples from MW-6 All but one <br /> of the samples were obtained from between about 6-8 feet BGS No soil samples from <br /> MW-8 were submitted for analysis because that location is surrounded by data points <br /> which were known to have been contaminated with gasoline A total then, of 16 soil <br /> samples were analyzed at the lab <br /> The soil sample B-8, 6-6 5 feet contained 2,000 ppm TPH as gasoline with 2.2 ppm <br /> benzene and 119 ppm -TEX Five of the soil samples, all from upgradient locations, <br /> contained between 110 and 440 ppm TPH as gasoline with BTEX in the ppb range. Six <br /> of the samples were N D for TPH as gasoline and BTEX Four of these (B-14, 6-6 5', <br /> MW-6, 6 5', MW-6, 15', MW-7, 6') were down gradient from the USTs All of those <br /> except MW-7, 6' were from within 15 feet of the USTs The other two samples with <br /> N D results (B-20, T, B-21, T) were from cross gradient data points <br /> Parker Environmental Services, 190 East 7th Street, Pittsburg, CA 94565-2317 <br /> Phone (510) 439-1024 Fax (510) 439-2566 <br />