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Tab 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) WeII Ground Depth j DATE Head Water To Notes TPH- Benzene Toluene Ethyl- Xylenes MTBE Fecal Elev. Elev. Water Gasoline Benzene Coliform MW-9 11/24/97 11.68 -16.27 27.95 ** 120,000 14,000 30,000 3100 15,000 1800.00 02/11/98 11.68 -13.41 25.09 -- 110,000 6900 20,000 2600 13,000 <500 06/09/98 11.68 -10.33 22.01 *** 75,000 7800 19,000 2300 12,000 <250 07/30/98 11.68 -10.14 21.82 -- 66,000 5500 1700 1800 1300 1300.00 11/10/98 11.68 -11.16 22.84 - 4700 140 8.1 280 87 <5.0 02117199 11.68 -10.07 21.75 -- 25,000 2600 6000 670 4000 <250 05/18/99 11.68 -9.62 21.30 -- 71,000 13,000 27,000 2300 14,000 <2.5 08/30/99 11.68 -10.86 22.54 -- 85,000 9200 17,500 1620 10,500 <2500 12/02/99 11.68 -11.30 22.98 -- 39,300 3170 6480 829 4380 <1000 - 02/02/00 11.68 -11.21 22.89 92,700 10900 20800 2290 12000 <2500 05/17/00 11.68 -9.02 20.70 .. 59,7003 6,070 13,500 <250 12,400 <1,250 -- **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. TRIP BLANK 11/22/94 -- -- <50 <0.5 <0.5 <0.5 <0.5 02/24/95 - -- -- <50 <0.5 <0.5 <0.5 <0.5 05/16/95 -- -- <50 <0.5 <0.5 <0.5 <0.5 08/03/95 -- -- -- -- <50 <0.5 <0.5 <0.5 <0.5 11/16/95 - -- <50 <0.5 <0.5 <0.5 <0.5 02/22/96 -- - -- <50 <0.5 <0.5 <0.5 <0.5 05/07/96 - -- <50 <0.5 <0.5 <0.5 <0.5 <2.5 08/21/96 - -- - -- <50 <0.5 <0.5 <0.5 <0.5 09/24/96 -- -- -- <50 <0.5 <0.5 <0.5 <0.5 11106196 -- -- -- <50 <0.5 <0.5 <0.5 <0.5 <2.5 02/27/97 -- -- - -- <50 <0.5 <0.5 <0.5 <0.5 <2.5 9-0557.xis1#386843 13 As of 05/17/00