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• • i Cumulative Table of Well Data and Analytical Results Vertical Measurements are in feet Analytical results are in parts per billion(ppb) Well roup epi DATE Head Water To Notes TPH- Benzene Toluene Ethyl- Xylene MTBE EDB DIESEL Motor Off TOG Elev Elev Water Gasoline Benzene MW-4 09/05/90 1301 -4224 5525 - <50 <0 5 <0 5 <0 5 <0 5 -- <0 2 — 11/29/90 1301 -42 50 5551 + <50 <0 5 <0 5 <05 <0 5 -- 03/14191 1301 -4276 5577 + <50 <0 5 <0 5 <0 5 <0 5 - - -- 06/06/91 1301 -4262 5563 -- 630** 0 5 10 <0 5 1 2 -- -- -- 08/29/91 1301 -4326 5627 -- 610* <0 5 <0 5 <0 5 <0 5 - - -- -- 12/06/91 1301 -42 12 5513 -- 680*** 3 0 5 6 1 7 6 5 - - - - -- 03/12/92 1301 -4084 5385 -- 1400* <0 5 <0 5 <05 <0 5 - - - - 06/11/92 1301 -4225 5526 -- <50 <0 5 <0 5 <0 5 <0 5 - - - 09/03/92 1301 -4342 5643 -- 480* 0 7 <0 5 <0 5 1 7 -- -- -- 12/17/92 1301 -4233 5534 -- 4800 0 6 15 27 17 03/17/93 1301 -4044 5345 -- <50 1 0 <0 5 <0 5 2 0 -- - - - 06l28193 1301 -3902 5203 + <50 <0 5 0 9 <0 5 2 0 - -- - - 06/28193 13 01 -- -- - -- <5 0 <5 0 <5 0 <5 0 - - -- -- 09/15/93 1301 -39 57 52 58 - -- -- -- -- -- 09/29193 1301 -- -- -- 58* 70 8 0 2 0 9 0 - - 12/29/93 13 01 -38 41 5142 - <50 10 0 9 <0 5 1 0 -- -- -- -- -- 03/24/94 1301 -3647 4948 -- <50 <0 5 10 <0 5 3 6 - - -- - 06116/94 1301 -3553 4854 -- <50 0 5 14 1 3 4 2 -- -- - -- 10/04/94 1301 -3643 4944 -- 2900* <50 <10 <10 <20 -- - -- 11/08/94 1301 -3664 4965 - <50 0 5 1 5 1 0 3 5 -- -- -- - -- 03/14195 1301 -34 80 4781 - 2700 <50 <5 0 <5 0 <5 0 - -- 05l30l95 1301 -3350 4651 - 1700 <50 <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 -- -- -- - -- 11105/95 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 1301 -2865 41 66 -- 230* <0 5 <0 5 <0 5 <0 5 <2 5 - -- 8/12-13196 1301 -2898 41 99 + 2300* <5 0 <5 0 <50 5 1 <25 -- 11/11-12196 1301 -2845 4146 + 940* <2 5 <2 5 <2 5 <2 5 <12 - -- 02/24/97 1301 -25 71 3872 -- 300" 1 0 <0 5 <0 5 <0 5 <2 5 -- 07/20/97 1301 -2580 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 - CONTINUED ON NEXT PAGE *Chromatogram pattern indicates an unidentified hydrocarbon **Gasoline range concentration reported peaks are representative of tetrachloroethane and trace amount of gasoline **'Chromatogram pattern indicates an unidentified hydrocarbon and gas +See Table 3 Additional Analyses Blame Tech Services Inc 000216 K 1 1 st-Q 2000 Monitoring at Chevron 9 6171 6633 Pacific Ave Stockton CA 6