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Cumulative Table Of Well Data and Analytical Results Vertical Measurements are in feet. Analytical results are In parts per billion (ppb) Well Ground Depth DATE Head Water To Notes TPH- Benzene Toluene Ethyl- Xylene Fecal MTBE Elev. Elev. Water Gasoline Benzene Coliform MW-5 11/10/92 12.09 -35.56 47.65 -- ND ND ND ND ND - 02/16/93 12.09 -33.88 45.97 -- ND ND ND ND 0 7 - 05/17/93 12.09 -31.57 43.66 -- 600 12 33 18 110 08/17/93 12.09 -31.54 43.63 -- 145 1.0 ND 0 9 08 11/22/93 12.08 -31.93 44.02 -- 180 9 0 17 3 0 10 02/09/94 12.08 -31.73 43.81 -- 290 ND 0.9 2.0 2.0 - 05/27/94 12.08 -30.69 42.77 160 0.5 1.1 2.2 13 08/05/94 12.08 -30.95 43.03 - 320 ND 1.5 1.8 0.8 11/22/94 12.08 -31.90 43,98 -- 59 <0.5 <0.5 1 0 0 5 02/24/95 12.08 -28.21 4029 - 540 2.5 1.4 46 24 05/16/95 12.08 -24.43 36.51 - 420 0 81 <0.5 1 8 3.6 08/03/95 12.08 -23.67 35.75 -- 680 71 4 6 <0.5 7.0 11/16/95 12.08 -23.50 35.58 -- 540 20 1.3 2 8 1 7 02/22/96 12.08 -21.78 33.86 -- 760 40 7.2 <2 5 13 05/07/96 12.14 -19.36 31.50 -- 530 81 5 0 5.2 26 15 08/21/96 12.14 -19.75 31.89 - 330 23 <0.5 16 11 19 09/24/96 12.14 -19.83 31.97 -- 11/06/96 12.14 -19.93 32.07 -- 880 62 2.0 <10 7.5 10 02/27/97 12.14 -15.03 27.17 - 2000 38 2.2 <12 18 18 05/20/97 12,14 -15.54 27.68 -- 1700 62 <2.5 65 13 <12 09/02/97 12.14 -16.32 28.46 800 28 1.1 4 3 5 5 <2.5 11/24/97 12.14 -16.76 28.90 "' 560 17 <2.0 <2.0 8.4 <10 02/11/98 12.14 -14.16 26.30 -- 1000 34 5.7 31 14 <2.5 06/09/98 12.14 -10.65 22.79 "*' 98 058 1.1 <0 5 <0 5 <2 5 07/30/98 12.14 -10.61 22.75 -- 1100 35 7.3 6.7 20 100 11/10/98 12.14 -11.64 23.78 -- <50 <0 5 <0.5 <0 5 <0.5 <2.5 " 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 Blaine Tech Services, Inc. 981110-T-1 4th-0 1998 Monitoring at Chevron 9-0557 139 S. Center St, Stockton,CA 5