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Tab Groundwater Monitonng)hand 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) WeI1 Ground Depth DATE Head Water To Notes TPH- Benzene Toluene Ethyl- Xylenes MTBE EDB DIESEL Oil TOG Elev Elev Water Gasoline Benzene MW-5(cont) 09/15/93 1251 -39 53 5204 _ 09/29/93 1251 -- -- -- <50 10 3 0 08 4 0 12/29/93 1251 -3837 5088 -- <50 06 10 <0 5 2 0 03/24/94 1251 -36 44 4895 -- 58 3 0 6 7 2 1 12 - -- 06/16/94 1251 -3547 4798 -- <50 0 5 12 <0 5 2 5 - - 10/04/94 1251 -3634 4885 -- <1000 <5 0 <10 <10 <20 11/08/94 12 51 -3651 4902 -- <50 <0 5 <0 5 <0 5 <0 5 03/14/95 1251 -3476 4727 -- 230 <0 5 <0 5 <05 <0 5 - - 05/30/95 1251 -33 43 4594 -- 220 <0 5 <0 5 <0 5 <0 5 08/20/95 1251 -3360 4611 -- 270* <0 5 <0 5 <05 <0 5 <2 5 08/20/95 1251 -- -- -- <22 <22 <22 <22 - - 11/05/95 1251 -33 20 4571 -- 200* <0 5 l 5 <0 5 <0 5 02/12/96 1251 -3108 4359 -- 180* <0 5 <0 5 <0 5 <0 5 05/12/96 1251 -28 62 41 13 -- 130* <0 5 <0 5 <0 5 <0 5 <2 5 - 08/12/96 1251 -28 91 4142 -- 120* 2 4 2 1 <0 5 2 3 2 5 11/11196 1251 -28 49 4100 -- 200* <0 5 <0 5 <0 5 <0 5 <2 5 02124/97 1251 -2570 3821 160* <0 5 <0 5 <0 5 <0 5 <2 5 07/20/97 1251 -2572 3823 -- 300 47 31 2 2 9 8 5 7 11/11/97 1251 -2567 38 18 -- 1500* <0 5 <0 5 <0 5 <0 5 <2 5 11/11/97 1251 -25 67 38 18 Confirmation run -- -- - -- <25 11/14/97 1251 03/01/98 1251 -2288 3539 97* <0 5 <0 5 <0 5 <0 5 <2 5 -_ 03/01/98 1251 -22 88 3539 Confirmation run <';3 05/10/98 1251 -21 13 33 64 -- 170 28 2 7 2 6 6 7 <2 5 8117-18198 1251 -2087 3338 -- 140* 17 <0 5 <0 5 <0 5 8 5 11/18/98 1251 -2044 3295 -- <50 <0 5 <0 5 <0 5 <0 5 <2 5 12/23/98 1251 -2033 3284 -- -- -- -- 200* <250 02/23/99 1251 -2224 3475 -- <50 <0 5 <0 5 <0 5 0 667 <5 0 - 200* <250 *Chromatogram pattern indicates an unidentified hydrocarbon 9-6171 xls/#385121 7 As of 05/22/00