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Tab4 Groundwater Monitoring DI:..--and Analytical Results Chevron Service Station#9-6258 2409 East Main at F Street Vertical Measurements are in feet Stockton,California Analytical values are in parts Rer billion(ppb). Well Ground D th DATE Head Water 14 TPH Benzene Toluene Ethyl- Xylenes MTBE E. )✓lev. lev Water CasoEiie Benzene . MW-I . 04/15/99 22.42 -25.65 48.07 <50 <0.5 <0.5 <0.5 <0.5 08/30/99 22.42 -28.75 51..17 101 9.2 19.6 2.1 ll <2.5 12/02/99 22.42 -28.07 50.49 <50 <0.5 <0.5 <0.5 <0.5 <2.5 01/20/00 22.42 -27.05 49.47 <50 <0.5 <0.5 <0.5 <0.5 <2.5 04/24/00 22.42 -25.25 47.67 <50.0 <0.500 <0.500 <0.500 <0.500 <2.50 07/27/00 22.42 -27.39 49.81 <50 <0.50 <0.50 <0.50 <0.50 <2.5/<2.0' MW-2 04/15/99 21.74 -25.62 47.36 <50 <0.5 <0.5 <0.5 <0.5 08/30/99 21.74 -28.70 50.44 <50 1.8 6.3 0.72 4.0 <2.5 12/02/99 21.74 -28.06 49.80 <50 <0.5 <0.5 <0.5 <0.5 <2.5 01/20/00 21.74 -27.01 48.75 <50 <0.5 <0.5 <0.5 <0.5 <2.5 04124/00- .21.74 . :-25.19.. 46.93.:. - --<50.0 <0:500 - <0.500 - <0.600 <0500` <2.50 07/27/00 21.74 -27.33 49.07 <50 <0.50 <0.50 <0.50 <0.50 <2.5/<2.0' MW-3 04/15/99 21.58 -25.62 47.20 <50 <0.5 <0.5 <0.5 <0.5 08/30/99 21.58 -28.65 50.23 <50 1.2 5.0 0.76 4.1 <2.5 12/02/99 21.58 -28.09 49.67 <50 <0.5 <0.5 <0.5 <0.5 Q.5 01/20/00 21.58 -27.02 48.60 <50 <0.5 <0.5 <0.5 <0.5 <2.5 04/24/00 21.58 -25.21 46.79 <50.0 <0.500 <0.500 <0-500 <0.500 <2.50 07/27/00 21.58 -28.29 49.87 <50 <0.50 <0.50 <0.50 <0.50 <2.51<2.0' TRIP BLANK 08/30/99 -- <50 <0.5 <0.5 <0.5 <0.5 <2.5 12/02/99 - - - Y <50 <0.5 _ <0.5 <0.5 <0.5. <2.5 01/20/00 - -- <50 <0.5 <0.5 <0.5 <0.5 <2.5 04/24/00 - -- <50.0 <0.500 <0.500 <0.500 4.500 <2.50 07/27/00 -- -- -• <50 <0.50 <0.50 <0.50 <0.50 <2.5 9-6258.xls/#386844 1 As of 07/27/00