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TABLE 1 GROUNDWATER MONITORING DATA, FORMER EXXON RS 7-3708, 2705 COUNTRY CLUB BOULEVARD, STOCKTON,CA Reference Depth to Groundwater Ethyl- Total TPH as Oxygenate Monitoring Elevation Groundwater Elevation Benzene Toluene benzene Xylenes gasoline MTBE Compounds Well Date (feet) (feet) (feet) (µg/L) (µgrL) (µg/L) (µg/L) (pg/L) (pglL) (} IL) MW5 08/31/99 -080 765 -845 -05 <0 5 <0 5 <0 5 <50 2 62 NA (Screened 11/23/99 -078 796 -874 1 0 <1 0 <1 0 <1 0 <50 17 NA 10-25 ft 02110100 5 95 -673 5 0 <5 0 <5 0 <5 0 <100 <5 0 ND bgs) 05 17100 5 77 -6 55 1 <1 08/07/00 700 -778 <0 5 <0 5 <0 5 <0 5 <50 92 NA 08/07/00 <50, MW6 02111,92 -051 13 56 1407 06 --05 <0 5 <0 5 51, NA NA 03/18/92 1149 -1200 06 <0 5 <0 5 <0 5 <501, NA NA (Screened 06/04/92 1234 -12 85 `0 5 <0 5 <0 5 <0 5 <50 NA NA 10-25 tt 09/28/92 1499 -15 50 <0 5 <0 5 <0 5 <0 5 <50 NA NA bgs) 12/18/92 1473 -15 24 <0 5 <0 5 <0 5 <0 5 <50 NA NA 04/05/93 862 -9 13 -0 5 <0 5 --05 <0 5 90` NA NA 09/23/93 It 83 -1234 <0 5 08 <0 5 1 5 52 NA NA 11/15/93 1260 -13 11 A 5 <0 5 <0 5 <0 5 <50 NA NA 02/10/94 1150 -12 01 07 <0 5 <0 5 <0 5 <50 NA NA 05/31/94 1065 -11 16 <-0 5 <0 5 <0 5 <0 5 <50 NA NA 08130194" 1232 -12 83 <0 5 -�0 5 <0 5 <0 5 <50 NA NA 11/22/944 1303 -13 54 <0 5 <0 5 <0 5 <0 5 <50 NA NA 01/12/951 11 89 -1240 1 3 <0 5 <0 5 <0 5 <50 NA NA 03/31/95 741 -792 <0 5 <0 5 <0 5 <0 5 <50 NA NA 04/05/95 NM NC -0 5 -05 <0 5 <0 5 <50 NA NA 07/14/95 NM NC <0 5 <0 5 -05 <0 5 <50 NA NA 07/17/95 938 -989 NS INS NS NS NS NS NS 10/05/95 11 45 -11 96 77 <0 5 <0 5 <0 5 <50 NA NA 11/29/95 11 51 -1202 086 <0 5 <0 5 <0 5 <50 NA NA 04/02/96 729 -780 <0 5 <0 5 <0 5 <0 5 <50 NA NA 07/31/96 900 -9 51 <0 5 --05 <0 5 <0 5 <50 NA NA 10/23/96 1003 -10 54 <0 5 <0 5 <0 5 <0 5 <50 22 NA 02/07/97 470 -5 21 <0 5 <0 5 <0 5 <0 5 <50 NA NA 05/30/97 742 -793 <0 5 <0 5 --0 5 <0 5 <50 59 NA 08/20/97 933 -9 84 <0 5 <0 5 <0 5 <0 5 <50 23 NA 11/24/97 924 -9 75 -0 5 <0 5 <0 5 <0 5 <50 14� ND f1pjojects173708Nmastcf\wp\g80013708gA xis Page 7 of 12