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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) (pg/L) (µg11) (µg/L) (pgfl (µg/L) (pg/L) WIL) MW3 03/31/95 050 NM NC 490 <50 67 -50 1,300 NA NA 04/05/95 856 -906 610 <5 0 83 <5 0 1,700 NA NA (Screened 07114x'95 NM NC 15 <-0 5 <0 5 <0 5 <50 NA NA 12-27 ft 07/17/95 1031 -991 NS NS NS NS NS NS NS bgs) 10/05/95 12 27 -11 77 13 <0 5 <0 5 <0 5 <50 NA NA 04/02/96 7 19 -669 24 <0 5 <0 5 <0 5 <50 NA NA 07/31/96 973 -9 23 580 X10 11 --10 1,400 NA NA 10/23/96 1088 -1038 20 <0 5 <0 5 <0 5 55 29 NA 02/07/97 5 77 -5 27 8 1 <0 5 <0 5 <0 5 <50 NA NA 05/30/97 844 -7 94 23 <0 5 <0 5 <0 5 74 27 NA 08/20/97 1027 -9 7-7 <0 5 <0 5 <0 5 <0 5 <50 19 NA { 11/24/97 1021 -971 1 0 <0 5 <0 5 <0 5 <50 67h ND 03/30/98 5 75 -5 25 <0 5 <0 5 <0 5 <0 5 <50 77h ND 06/30/98 720 -670 <0 5 <0 5 <0 5 <0 5 <50 59h ND 10/05/98 8 69 -8 19 <0 5 <0 5 <0 5 <0 5 <50 53 NA 12/16/98 8 10 -760 <0 5 <0 5 <0 5 <0 5 <50 62 NA 03/05/99 661 -6 11 <0 5 <0 5 <0 5 <0 5 <50 66 NA 05/14/99 7 09 -6 59 <0 5 <0 5 <0 5 <0 5 <50 60 1 14A 06/04/99 7 56 -706 NS NS NS NS NS NS NS 08/31/99 NM NC NS NS NS NS NS NS NS 11123/99 051 NM NC NS NS NS NS NS NS NS 02/10/00 NM NC NS NS NS NS NS NS NS 05/17/00 NM NC NS NS NS NS NS NS NS 08/07/00 NM N( NS NS NS NS NS NS NS MW4 02/10/92 -038 NM NC --05 0 9 <0 5 0 9 91` NA 314A 02/11 92 1361 -13 99 NS NS NS NS NS NS NS (Screened 03/18/92 1160 -1199 <0 5 <0 5 <0 5 <0 5 91d NA NA 11 5-26 5 ft 06/04/92 1232 -12 70 0 6 �0 5 <0 5 <0 5 67 NA NA bgs) 09/28/92 1501 -15 39 --05 <0 5 <0 5 <0 5 91 NA VA 12/18/92 1480 -15 18 <0 5 <0 5 <0 5 <0 5 89 NA NA 04/05/93 860 -898 <0 5 -0 5 <0 5 <0 5 70` NA NA 09/23/93 1173 -12 11 0 7 1 4 0 7 3 <50 NA NA 1 1piojects1737081m isterlwplg8a013708g%4 xis Page 4 of 12