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TA , • r GROUNDWATER MONITORING 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) (ug/L) (ug1L) (ug1L) (ug1L) (ug/L) (ug/L) (uglL) (ug/L) (ug1L) (ug/L) (ug1L) (ug1L) (ug/L) (feet) (feet sea level) (feet sea level) Comments MW-6 03/31/98 110 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 4836 2066 2770 screened 06/10/98 79 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 4268 2202 interval 09108!98 <50 086 077 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 na na 4697 2631 no odor 1 no sheen 48 715 11/12/98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 2065 wellhead survey 12/30198 53 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4557 2492 no odor 1 no sheen 03/26/99 84 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 na na 41 25 2060 no odor I no sheen 06102/99 59 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 <0 50 <0 50 4071 2006 no odor 1 no sheen 08/31/99 63 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 <0 50 <0 50 4557 2492 no comment 12/09/99 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 <0 50 <0 50 4729 -2664 02121/00 690 29 120 20 87 <0 50 <0 50 <0 50 <0 50 <5 0 <50 20 1 1 16 4569 2504 no odor I no sheen 05/18/00 <50 <0 50 23 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 na na 4084 2019 no odor/no sheen 09/26100 <50 <0 50 <0 50 <0 50 <0 50 na na na na na na na na na 4892 -2827 no odor I no sheen 12/20/00 <50 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 4761 -2696 no odor 1 no sheen 03/27/01 <50 <0 50 066 <0 50 <0 50 <5 0 na na na na na na na na 4639 -2574 no odor 1 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 <50 1 8 <0 50 4896 -2831 no odor I no sheen 09/05/01 64 055 <0 50 <0 50 086 <50 na na na na na na na na 54 t}9 -3344 no odor I no sheen 11/30/01 87 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 5408 -3366 no odor I no sheen 02/27/02 93 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 50 all -3016 no odor I no sheen 05/16/02 86 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 <0 50 <0 50 5095 2221 2874 no odor/no sheen 09/13/02 110 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5897 3676 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 5733 3512 no odor/no sheen 02/17/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5421 -3200 no access 06102!03 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 <0 50 <0 50 5354 -31 33 no odor 1 no sheen 09/18/03 100 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5978 -3757 no odor I no sheen 11/24/03 120 <0 50 <0 50 <0 50 <0 50 <0 50 na na na na na na na na 5851 -3630 no odor 1 no sheen 02/23/04 73 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 <0 50 <0 50 5503 3282 no odor 1 no sheen "ect No 1419 47 g N4 As Page 6 of 13 HORIZON ENVIRONMENTAL INC Pro/ec[