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i� TABM GROUNDWATER MO TORING DATA Former Beacon Station No 12419 2350 Waterloo Road,Stockton,California ethyl Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ug/L) (ug1L) (ug/L) (ug1L) (ug/L) (ug1L) (ug1L) (ug/L) (ug1L) (ug1L) (ug/L) (ug/L) (ug/L) (ug/L) (feet) (feet sea level) (feet sea level) Comments MW-7 11/12/98 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/no sheen interval 03/26/99 550 94 <0 50 <0 50 <0 50 4 50 4 50 <0 50 4 50 23 <50 <5 0 na na 4133 2078 no odor 1 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 4 50 4076 2021 no odor 1 no sheen 08/31/99 120 <0 50 <0 50 <0 50 <0 50 12 <0 50 <0 50 4 50 13 <50 <50 160 <0 50 4556 2501 no comment 12/09199 130 .050 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 12 <50 <5 0 98 <0 50 47 t4 2659 02/21100 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 05116!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 09126100 68 <0 50 <0 50 .050 <0 50 <5 0 na na na na na na na na 4889 2834 no odor 1 no sheen 12120100 B7 <0 50 4 50 <0 50 <0 50 <5 0 na na na na na na na na 4751 2696 no odor 1 no sheen 03/27/01 <50 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 4637 2582 no odor 1 no sheen 06/26/01 <50 <0 50 4 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 68 <0 50 <0 50 <0 50 4 50 <5 0 na na na na na na na na 5406 3351 no odor 1 no sheen 11/30/01 97 <0 50 <0 50 <0 50 <0 50 45 0 na na na na na na na na 5401 3346 no odor 1 no sheen 02/26102 66 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 5065 30 10 no odor 1 no sheen 05/16/02 87 <0 50 <0 50 <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 09/12102 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 <50 na na na na na na na na 5724 3513 no odor 1 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 .050 <0 50 <0 50 <0 50 <5 0 <50 <5 0 16 <0 50 5331 31 20 no odor 1 no sheen 09/18/03 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5963 37 52 no odor 1 no Sheen 11/24103 ns ns nsns ns ns ns ns ns ns ns ns ns ns 5B 44 3633 not sampled 02/23/04 <50 <0 50 '050 '050 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 12 70 <0 50 5497 3286 no odor 1 no sheen 06/07104 ns AS ns ns ns ns ns ns ns ns ns ns ns ns 55 17 3306 not sampled 09/07104 <50 <0 50 <0 50 <0 50 <0 50 0 70 na na na na na na na na 6062 3851 no odor 1 no sheen 12/10104 ns ns AS ns ns ns ns ns ns ns ns ns ns ns 5942 3731 not sampled 1 si9ym xis Prgect Na 1419 47 Page 7 of 13 HORIZON ENVIRONMENTAL INC N