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Cumulative Table of Well Da a nAnalytical • ' t and Results Vertical Measurements are in feet Analytical results are in parts per billion(ppb) - Well roue ept DATE Head Water To Notes TPH- Benzene Toluene Ethyl- Xylene MTBE Elev Elev Water Gasoline Benzene MW-8 01/18/94 1 18 -1484 1602 51 ND ND ND ND -- 06/27/94 1 18 -1415 1533 -- ND ND ND ND ND -- 09/29/94 1 18 -1537 16 55 -- ND ND ND ND ND -- 12/08/94 1 18 -1502 1620 Anomalous 110* 3 5 <0 5 <0 5 <0 5 -- 01/31/95 1 18 -1352 1470 Anomalous 140* <0 5 <0 5 <0 5 <0 5 -- 03/08/95 1 18 -1280 1398 -- 70 <0 5 <0 5 <0 5 0 7 -- 06/01/95 1 18 -1123 1241 -- 220 0 9 <0 5 1 6 0 7 -- 09/11/95 1 18 -1305 1423 -- 1000 <1 0 <1 0 4 0 <1 0 -- 12/05/95 1 18 -1327 1445 -- 380 5 0 1 2 0 9 <0 5 -- 03/18/96 1 18 -954 1072 920 4 5 <0 5 13 <0 5 -- 06/18/96 1 18 -1160 1278 -- 230 <0 5 <0 5 <0 5 <0 5 11 09/24/96 1 18 -11 37 1255 -- 240 <0 5 <0 5 <0 5 <0 5 14 12/04/96 1 18 -1104 1222 -- 200 <0 5 <0 5 <0 5 <0 5 24 02/25/97 1 18 -690 808 -- 200 <0 5 <0 5 <0 5 0 8 13 05/06/97 1 18 -780 8 98 -- 90 <0 5 <0 5 <0 5 <0 5 18 09/29/97 1 18 -1054 11 72 -- 370 32 0 7 <0 5 <0 5 18 11/25/97 1 18 -1048 1166 ** 170 3 5 <0 5 <0 5 <0 5 *** 03/26/98 1 18 -396 514 **** <50 <0 5 <0 5 <0 5 <0 5 <2 5 06/24/98 1 18 -594 7 12 «««« <50 <0 5 <0 5 <0 5 <0 5 <2 5 09/10/98 1 18 -789 907 -- <50 <0 5 <0 5 <0 5 <0 5 <2 5 Hydrocarbons were found in the range of gasoline, but do not resemble a gasoline fingerprint "MTBE by EPA 8260 was detected at 19 ppb Ethanol,t-Butanol, RIPE,TAME and ETRE by EPA 8260 and Methanol by EPA 8020 were not detected, see lab report for detection limits '*No value for MTBE could be determined, see lab report .*«See Table of Additional Analyses Blaine Tech Services,Inc 980910-Z-2 3rd-Q 1998 Monitoring at Chevron 9-4275 2905 W Benjamin Holt Dr, Stockton,CA 13