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•Groundwater Monitoringing D D nd Analytical Results Chevron Service Station#9-6171 6633 Pacific Avenue Vertical Measurements are in feet Stockton,California Analytical results are in parts per billion( b) 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) 03/17/93 1301 -4044 5345 -- <50 10 <0 5 <0 5 2 0 - -- 06/28/93 1301 -3902 5203 -- <50 <0 5 0 9 <0 5 2 0 - - 06/28/93 1301 -- -- -- -- <5 0 <5 0 <5 0 <5 0 -- 09/15/93 1301 -3957 5258 -- -- -- -- -- -- 09129/93 1301 -- -- -- 58* 7 0 80 2 0 90 - 12/29/93 1301 -3841 5142 -- <50 10 09 <0 5 to - -- 03/24/94 1301 -36 47 4948 -- <50 <0 5 10 <0 5 3 6 -- -- 06/16/94 1301 -3553 4854 -- <50 0 5 14 13 4 2 10/04/94 1301 -3643 4944 -- 2900* <5 0 <10 <10 <20 11/08/94 1301 -36 64 4965 -- <50 0 5 l 5 1 0 3 5 03/14/95 1301 -3480 4781 -- 2700 <5 0 <5 0 <5 0 <50 05/30/95 1301 -33 50 4651 -- 1700 <5 0 <5 0 <5 0 <5 0 -- 08/20/95 1301 -3365 4666 -- 610* <0 5 <0 5 <0 5 <0 5 <2 5 08/20/95 1301 -- -- -- -- <100 <100 <100 <100 -- 11/05/95 1301 -3326 4627 -- 1900* <5 0 <5 0 <5 0 <5 0 02/12/96 1301 -31 11 44 12 -- 460* <0 5 <0 5 <0 5 <0 5 -- 05/12/96 13 01 -28 65 4166 -- 230* <0 5 <0 5 <0 5 <0 5 <2 5 - -- 8/12-13196 13 01 -2898 4199 -- 2300* <5 0 <5 0 <5 0 5 1 <25 - 11/11-12196 1301 -2945 4146 -- 940* <2 5 <2 5 <2 5 <2 5 <12 -- - 02/24/97 1301 -2571 3872 -- 300* 10 <0 5 <0 5 <0 5 <2 5 07/20/97 1301 -25 80 3881 -- 330* 062 <0 5 <0 5 <0 5 <2 5 -- -- 11/11/97 1301 -2571 3872 -- 160* <0 5 <0 5 <0 5 <0 5 <2 5 - - 03/01/98 1301 -2211 35 12 ** 280* <0 5 <0 5 <0 5 <0 5 <2 5 -- 03/01/98 1301 -2211 35 12 Confirmation run -- -- -- -- -- <33 -- - *Chromatogram pattern indicates an unidentified hydrocarbon **Gasoline range concentration reported,peaks are representative of tetrachloroethane and trace amount of gasoline 9-6171 xis/#385121 5 Ae of 05122!00