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Tab Groundwater Monitoring and Analytical Results Chevron Service Station#9-4275 2905 West Benjamin Holt Drive Vertical Measurements are in feet Stockton,California Analvucal results are in parts per billion(ppb) Well Ground Depth DATE Head Water To Notes TPH- Benzene Toluene Ethyl- Xylenes MTBE Elev Elev Water Gasoline Benzene MW-8(cont) 05/06/97 118 -780 898 - 90 <0 5 <0 5 <05 <0 5 18 09/29/97 1 18 -10 54 1172 -- 370 3 2 0 7 <0 5 <0 5 18 11/25/97 1 18 -1048 1166 -- 170 3 5 <0 5 <0 5 <05 *** 03/26/98 1 18 -396 5 14 -- <50 <05 <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 -7 89 907 -- <50 <0 5 <0 5 <05 <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 -592 7 10 -- <50 <0 5 <0 5 <0 5 <0 5 <2 5 06/22/99 1 18 -6 31 749 -- <50 <0 5 <0 5 <0 5 <0 5 <2 0 09/13/99 1 18 -915 1033 -- <50 <05 <0 5 <0 5 <0 5 <2 5 12/16/99 1 18 -906 1024 -- <50 <0 5 <0 5 <0 5 <0 5 <2 5 03/01/00 1 18 -476 594 -- <50 <0 5 <0 5 <0 5 <0 5 <2 5 06/13/00 1 18 -647 7 65 -- <50 0 <0 500 <0 500 <0 500 <0 500 <5 00 09/13/00 118 -8.52 9.70 -- <50 0 <0 500 <0 500 <0 500 <0 500 <5 00 MW-9 06/27/94 265 -1395 1660 - 90 0 9 0 5 0 5 ND -- 09/29/94 2 65 -15 11 1776 -- 64 ND 0 7 ND 0 6 - 12/08/94 265 -1466 17 31 - 55 0 6 <0 5 <0 5 <0 5 03/08/95 265 -1233 1498 - 90 <0 5 <0 5 <0 5 <0 5 - 06/01/95 265 -1092 1357 -- <50 <0 5 <0 5 <0 5 <0 5 09/11/95 265 -1285 1550 100 <0 5 <0 5 <0 5 <0 5 12/05/95 265 -1325 15 90 - 110 <0 5 <0 5 <0 5 <0 5 03/18/96 265 -897 1162 <50 <0 5 <0 5 <0 5 <0 5 -- 06/18/96 265 -9 21 1186 -- <50 <0 5 <0 5 <0 5 <0 5 <5 0 ***No value for MTBE could be determined,see lab report 9-4275 x1s1#386845 14 As of 09/13/00