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TA • Groundwater Monitoring And Analytical Results Chevron Service Station#9-6171 6633 Pacific Avenue - 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 EDB DIESEL Oil TOG Elev Elev Water Gasoline Benzene MW-4(cont) 5110-11198 1301 -21 14 3415 -- 770* <0 5 <0 5 <0 5 <0 5 <2 5 08/17/98 1301 -20 94 3395 -- 300* <0 5 <0 5 <0 5 <0 5 <2 5 11/18/98 13 01 -2039 3340 -- <50 <0 5 <0 5 <0 5 <0 5 <2 5 02/23/99 1301 -22 17 35 18 -- <50 <0 5 <0 5 <0 5 <0 5 <5 0 05/19/99 1301 -17 84 3085 -- <50 <0 5 <0 5 <0 5 <0 5 <5 0 - 08/26/99 1301 -1936 32 37 <50 <0 5 <0 5 <0 5 <0 5 <5 0 11/17/99 1301 -1924 3225 ** <50 <0 5 <0 5 <0 5 <0 5 <5 0 02/16/00 1301 -2160 3461 ** 895 <0 5 <0 5 <0 5 <0 5 <2 5 05/22/00 1301 -1939 3240 -- 130' <0 50 <0 50 <0 50 <0 50 <2 5 -- -- -- -- *Chromatogram pattern indicates an unidentified hydrocarbon **Gasoline range concentration reported,peaks are representative of tetrachloroethane and trace amount of gasoline I MW-5 09/05/90 1251 -42 23 5474 -- <50 <0 05 <0 5 <0 5 <0 5 - <0 2 <5000 11/29/90 1251 -4251 5502 -- <50 <0 5 <0 5 <0 5 <0 5 -- <5000 03/14/91 1251 -4274 55 25 -- <50 <0 5 0 6 0 6 2 4 -- -- 03/14/91 1251 -- -- -- -- <3 0 <3 0 <3 0 3 6 06/06/91 1251 -4260 5511 -- 630* 0 5 10 <0 5 1 2 - 06/06/91 1251 -- -- -- -- <3 0 <3 0 <3 0 <3 0 08/29/91 1251 -46 5 -- 74* 2 1 3 4 0 8 44 08/29/91 1251 -- -- -- -- 2 0 40 <3 0 3 0 -- -- 12106/91 1251 -4207 5458 -- 73* 3 3 3 4 0 8 2 9 03/12/92 1251 -4102 5353 -- 290 14 30 5 5 30 - - - 06/11/92 1251 -4223 5474 - 120 2 0 2 6 0 6 19 - - 09/03/92 1251 -4340 5591 -- 160* <0 5 <0 5 <0 5 0 6 -- 12/17/92 1251 -4229 5480 -- 370 0 9 2 1 3 6 22 - 03/17/93 1251 -4041 5292 -- <50 07 <0 5 <0 5 2 0 - - 06/28/93 1251 -3897 5148 -- <50 05 0 5 <0 5 2 0 - -- Chromatogram pattern indicates an unidentified hydrocarbon 9 6171 xis/#385121 6 As of 05/22/00