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Cumulative Table of Wata and Analytical Results Vertical Measurements are in feet Analytical results are In parts per billion b i Well Ground Depth DATE Head Water To Notes TPH- Benzene Toluene Ethyl- Xylene MTBE i� Elev Elev Water Gasoline Benzene MW-8 01/18/94 1 18 -1484 1602 -- 51 ND ND ND ND i 06/27/94 1 18 -1415 1533 -- ND ND ND ND ND -- 06/29/94 1 18 -1537 1655 - ND ND ND ND ND 7 12/08/94 1 18 -1502 1620 Anomalous 110* 3 5 <0 5 <0 5 <0 5 - 01/31/95 1 18 -1352 14'70 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 -i 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 -11 60 1278 230 <0 5 <0 5 <0 5 <0 5 11 1 09/24/96 1 18 -11 37 1255 -- 240 <0 5 <0 5 <0 5 <0 5 14 12/04/96 1 18 -11 04 1222 -- 200 <0 5 <0 5 <0 5 <0 5 24 02/25/97 1 18 -6 90 808 -- 200 <0 5 <0 5 <0 5 0 8 13 05/06/97 1 18 -7 80 898 90 <0 5 <0 5 <0 5 <0 5 18 ,s 09/29/97 1 18 -10 54 11 72 -- 370 3 2 0 7 <0 5 <0 5 18 11/25/97 1 18 -1048 11 66 ** 170 3 5 <0 5 <0 5 <0 5 "* 03/26/98 1 18 -396 5 14 *'** <50 -<0 5 <0 5 <0 5 <0 5 <2 5 06/24/98 1 IS -594 7 12 **** <50 <0 5 <0 5 <0 5 <0 5 <2 5 09/10/98 1 18 -7 89 907 - <50 <0 5 <0 5 <0 5 <0 5 <2 5 12/17/98 1 18 -774 892 - <50 <0 5 <0 5 <0 5 <0 5 <2 5 03/10/99 1 18 -5 92 710 -- <50 <0 5 <0 5 <0 5 <0 5 <2 5 I# i 3 i ' 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,,DIPE,TAME and ETBE by EPA 8260 and Methanol by EPA 8020 were not detected, " see lab report for detection limits ; *'t,No value for MTBE could be determined, see lab report See Table of Additional Analyses 1; i I 1 Blaine Tech Services, Inc 990310 Z-1 1st-0 1999 Monitoring at Chevron 9-4275 2905 W Benjamin Holt DrStockton,CA 13