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• i • TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3708,2705 COUNTRY CLUB BOULEVARD, STOCKTON, CA Reference Depth to Groundwater Ethyl- Total TPH as Oxygenate Dissolved Monitoring Elevation Groundwater Elevation Benzene Toluene benzene Xylenes gasoline MTBE Compounds Lead well Date (feet) (feet) (feet) (gg/L) (gg/L) (ftg1L) (pgIL) (µg/l-) (Ag1L) (µg/L) (Ag/L) MW3 03/18/92 050 1237 -1187 79 05 07 <0 5 170 NA NA NA MW3 06/04/92 050 13 19 -1269 25 <0 5 <0 5 <0 5 87 NA NA NA MW3 09/28/92 050 1582 -1532 300 59 5 1 73 680 NA NA NA MW3 12/18/92 050 1567 -15 17 1,700 150 91 140 4,000 NA NA NA MW3 04/05/93 050 940 -890 360 54 30 75 1,100 NA NA NA MW3 09/23/93 050 1276 -1226 10 09 <0 5 19 <50 NA NA NA MW3 11/15/93 050 1352 -1302 36 <0 5 <0 5 <0 5 210 NA NA NA MW3 02/10/94 050 1239 -1189 950 19 84 16 1,900 NA NA NA MW3 05/31/94 050 1158 -1108 490 24 11 22 1,200 NA NA NA MW3 08/30/948 050 1325 -1275 420h 1 8 38 <0 5 1,000 NA NA NA MW3 11/22/948 050 1405 -13 55 48 <0 5 <0 5 <0 5 160 NA NA NA MW3 01/12/958 050 1283 -1233 81 05 14 <0 5 270 NA NA NA MW3 03/31/95 050 NM NC 490 <5 0 67 <5 0 1,300 NA NA NA MW3 04/05/95 050 856 -806 610 <5 0 83 <5 0 1,700 NA NA NA MW3 07/14/95 050 NM NC 15 <0 5 <0 5 <0 5 <50 NA NA NA MW3 07/17/95 050 1031 -981 NS NS NS NS NS NS NS NS MW3 10/05/95 050 1227 -1177 13 <0 5 <0 5 <0 5 <50 NA NA NA MW3 12/01/95 STATION OPERATIONS TRANSFERRED TO NEW WEST PETROLEUM MW3 04/02/96 050 7 19 -669 24 <0 5 <0 5 <0 5 <50 NA NA NA MW3 07/31/96 050 973 -923 580 <10 11 <10 1,400 NA NA NA MW3 10/23/96 050 1088 -1038 20 <0 5 <0 5 <0 5 55 29 NA NA MW3 02/07/97 050 577 -527 8 1 <0 5 <0 5 <0 5 <50 NA NA NA MI 05/30/97 050 144 -794 23 <0 5 <0 5 <0 5 74 27 NA NA MW3 08/20/97 050 1027 -977 <0 5 <0 5 <0 5 <0 5 <50 19 NA NA MW3 11/24/97 050 1021 -971 10 <0 5 <0 5 <0 5 <50 67h ND NA WN'3 03131098 050 575 -525 <0 5 <0 5 <0 5 <0 5 <50 77h ND NA r1projectsl73708'u=terlwp1g0902U708gwx1s Page 5 of 19