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TA6 1 . r GROUNDWATER MONITORING DATA Former Beacon Station No 12419 2350 Waterloo Road, Stockton, California ethyl- Depth to TOC GW Well TPH9 benzene toluene benzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number I Date (ug/L) (ug1L) (ug1L) (uglL) (ug/L) (ug1L) (ug/L) (ug1L) (ug/L) (ug/L) (ug/L) (ug/L) (ug1L) (ug/L) (feet) (feet sea level) (feet sea level) Comments MW-5 03131/98 75 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4846 2043 2803 screened 06!10/98 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4272 -2229 interval 09!08198 <50 12 091 <0 50 094 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 na na 4692 -2649 no odor 1 no sheen 48 -71 11/12/98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 2043 wellhead survey 12130/98 110 067 <0 50 <0 50 <0 50 <50 na na na na na na na na 4545 2502 no odor/no sheen 03126199 67 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <20 na na 4126 2083 no odor!no sheen 06102199 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 71 <0 50 4061 2018 no odor 1 no sheen 08/31199 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 16 <0 50 4549 2506 no comment 12/09199 140 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 200 <0 50 4704 2661 02/21100 140 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 5o <0 50 <5 0 <50 <5 0 190 <0 50 4547 25 04 no odor 1 no sheen 05/18/00 <100 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 12 <100 <10 na na 4071 2028 no odor!no sheen 09/26/00 64 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4882 2839 no odor I no sheen 12/20/00 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4741 2698 no odor/no sheen 03/27/01 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4619 2576 no odor I no sheen 06/26101 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 16 <0 50 4876 2833 no odor 1 no sheen 09/05101 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5379 3336 no odor 1 no sheen 11/30101 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5388 3345 no odor 1 no sheen 02127102 <50 <0 50 062 <0 50 <0 50 <5 0 na na na na na na na na 5052 -3009 no odor Ino sheen 05/16102 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 14 <0 50 5062 21 99 -2863 no odor 1 no sheen 09/12/02 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5857 3658 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 5711 3512 no odor!no sheen 02/17/03 57 <0 50 <0 50 <0 5o <0 50 <0 50 na na na na na na na na 5403 3204 no odor 1 no sheen 06/02103 <50 <0 50 <0 50 <0 50 <0 50 4050 <0 50 <0 50 <0 50 450 <50 <5 0 30 <0 50 5317 -31 18 no odor 1 no sheen 09/18/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 11/24/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5833 3634 not sampled —2ggro".1. Page 5 of 43 HORIZON ENVIRONMENTAL INC