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Ta _ Groundwater Monitoring Wand Analytical Results ' Chevron Service Station#9-4275 2905 West Benjamin Holt Drive - Vertical Measurements are in feet Stockton,California Analytical 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) 09/29/97 1 18 -l0 54 1172 - 370 3 2 0 7 <0 5 <0 5 18 11/25/97 1 18 -1048 1166 -- 170 35 <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 09/10198 1 18 -789 907 -- <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 -592 7 10 -- <50 <0 5 <05 <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 <0 5 <0 5 <0 5 <0 5 <2 5 12/16/99 1 18 -9 06 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 **'No value for MTBE could be determined,see lab report MW-9 06/27/94 2 65 -13 95 1660 -- 90 0 9 0 5 0 5 ND 09/29/94 265 -1511 1776 -- 64 ND 0 7 ND 0 6 12/08/94 265 -1466 1731 -- 55 0 6 <05 <0 5 <0 5 -- 03/08/95 2 65 -1233 1498 90 <0 5 <0 5 <0 5 <0 5 06/01/95 2 65 -1092 1357 <50 <0 5 <0 5 <0 5 <0 5 09/11/95 2 65 -1285 1550 -- 100 <0 5 <0 5 <0 5 <0 5 12/05/95 265 -1325 1590 -- 110 <0 5 <0 5 <0 5 <0 5 03/18/96 265 -897 I1 62 <50 <0 5 <0 5 <0 5 <0 5 -- 06/18/96 2 65 -9 21 1186 -- <50 <0 5 <0 5 <05 <0 5 <5 0 09/24/96 265 -9 21 1186 - 2200 21 <0 5 2 6 <0 5 1500 9-4275 xis/#386845 14 As of 06/13/00