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inabl Groundwater Monitoring D nd Analytical Results Chevron Service Station#9-0557 139 South Center Street Vertical Measurements are in feet. Stockton,California Analytical results are in parts per billion(ppb) Well Ground Depth DATE Head Water To Notes TPH- Benzene Toluene Ethyl- Xylenes MTBE Fecal Elev. Elev. Water Gasoline Benzene Coliform MW-7(cont) 11/24/97 11.08 -16.59 27.67 ** 6300 260 <50 420 210 <250 02/11/98 11.08 -13.82 24.90 -- 3800 120 18 110 140 <25 06/09/98 11.08 -10.54 21.62 #*# 7800 400 84 450 <50 780.00 07/30/98 11.08 -10.42 21.50 -- 4300 230 25 350 120 <100 11/10/98 11.08 -11.46 22.54 -- 3600 110 6.7 210 67 <5.0 02/17/99 11.08 -10.62 21.70 -- 1900 100 <100 170 77 <500 05/18/99 11.08 -9.72 20.80 -- 2300 83 <0.5 160 49 60,00 08/30/99 11.08 -10.98 22.06 -- 1740 75 8.05 1 1 1 39.3 <25 12/02/99 11.08 -11.57 22.65 -- 1390 61.6 5.65 91.4 33.7 <50 02/02/00 11.08 -11.27 22.35 - 2040 68.6 4.05 116 44.1 <5.0 05/17/00 11.08 -9.24 2032 -- 1,180' 67.1 <5.00 70.6 48.9 <25.0 I MW-8 11/24/97 11.28 -16.85 28.13 ** <50 <0.5 <0.5 <0.5 <0.5 <2,5 02/11/98 11.28 -14.53 25.81 -- 1200 57 9.0 4.7 6.8 <2.5 06/09/98 11.28 -10.72 22.00 *** 480 16 2.3 3.0 <50 40.00 07/30/98 11.28 -10.62 21.90 - 160 3.7 0.79 1.9 0.53 <2.5 11/10/98 11.28 -11.63 22.91 -- <50 <0.5 <0.5 <0.5 <0.5 <2.5 02/17/99 11.28 -10.82 22.10 -- 230 26 3.7 2.3 3.0 8.50 05/18/99 11.28 -9.92 21.20 -- 400 6.2 4.0 2.3 5.0 22.00 08/30/99 11.28 -11.04 22.32 -- <.50 <0.5 <0.5 <0.5 <0.5 <5.0 12/02/99 11.28 -11.71 22.99 -- <50 <0.5 <0.5 <0.5 <0.5 <5.0 02/02/00 11.28 -11.53 22.81 -- <50 <0.5 <0.5 <0.5 <0.5 <2.5 -- 05/17/00 11.28 -9.48 20.76 -- <50.0 <0.500 <0.500 <0.500 <0.500 <2.50 -- **Oxygenates by EPA 8260 and Methanol by EPA 8015 were not detected;see lab report for detection limits. ***Oxygenates by EPA 8260 were not detected;see lab report for detection limits. 9-0557.xis!#386843 12 As of 05/17/00