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iT1 GROUNDWATER MONITORING DATA Former Beacon Station No 12419 2350 Waterloo Road, Stockton, California ethyl- Depth to TOC GW Well TPHg benzene toluene benzene xyienes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ug/L) (ug/L) (ug/L) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (ug/L) (ug/L) (ug1L) (ug/L) (ug/L) (feet) (feet sea level) (feet sea level) Comments MW-7 11112!98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 2055 wellhead survey screened 12/30/98 340 48 1 74 22 <50 na na na na na na na na 4543 -2488 no odor 1 no sheen interval 03/26/99 550 94 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 23 <50 <5 0 na na 4133 2078 no odor!no sheen 41 66' 06/02/99 230 <0 50 <0 50 <0 50 <0 50 1 1 <0 50 <0 50 <0 50 28 <50 <5 0 270 <0 50 4076 -2021 no odor 1 no sheen 08/31199 120 <0 50 <0 50 <0 50 <0 50 12 <0 50 <0 50 <0 50 13 <50 <5 0 160 <0 50 4556 2501 no comment 12/09199 130 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 12 <50 <50 98 <0 50 4714 2659 02/21/00 130 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 84 <50 <5 0 96 <0 50 4556 2501 no odor 1 no sheen 05/18/00 120 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 68 <50 <5 0 na na 4078 2023 no odor 1 no sheen 09/26/00 68 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4889 2834 no odor 1 no sheen 12/20/00 87 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4751 -2696 no odor 1 no sheen 03/27101 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4637 2582 no odor I no sheen 06/26/01 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 33 <0 50 4903 2848 no odor 1 no sheen 09/05/01 88 <0 50 <0 50 <0 50 -1050 150 na na na na na na na na 5406 -3351 no odor 1 no sheen 11130/01 97 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 5401 3346 no odor 1 no sheen 02126/02 66 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na $065 3010 no odor 1 no sheen 05/16/02 87 <0 50 <0 511 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 26 <0 50 5071 2211 2860 no odor!no sheen 09/12/02 77 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5873 3662 no odor!no sheen 12/04/02 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5724 3513 no odor!no sheen 02/17/03 <50 <0 50 <0 50 <0 50 <0 50 <0 50 na na na na na na na na 5408 31 97 no odor 1 no sheen 06/02/03 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <Q 50 <0 50 <0 50 <5 0 <50 <5 0 16 <0 50 5331 3120 no odor 1 no sheen 09118!03 <50 <0 50 <0 50 <0 5o <0 50 <50 na na na na na na na na 5963 3752 no odor 1 no sheen 11124/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5844 3633 not sampled »r9grt3 s Page 7--113 HORIZON ENVIRONMENTAL INC