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TA01 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 TANTS TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ug/L) (uglL) (ug1L) (uglL) (ugly (ugly (uglL) (ug1L) (ugly (ugly (uglL) (ug1L) (ug1L) (ug1L) (feet) (feet sea level) (feel sea level) Comments MW-6 03/31/98 110 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no no no 4836 2066 -2770 screened 96110/98 79 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no no no 4268 2202 interval 09/08/98 <50 086 077 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 no no 4697 -2631 no odor 1 no sheen 48 -71 5 11112/98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 2065 wellhead survey 12130/98 53 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no na no no no 4557 2492 no odor/no sheen 03/26/99 84 <o 5o <0 50 <0 50 <0 50 <o 50 <0 50 <0 50 <0 50 <50 <50 <50 no no 41 25 -2060 no odor I no sheen 06/02199 59 <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 4071 2006 no odor 1 no sheen 08!31199 63 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 <0 50 <0 50 4557 2492 no comment 12/09199 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 Co 50 <0 50 4729 2664 02/21100 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 05118100 <50 <0 50 23 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 no na 4084 2019 no odor 1 no sheen 09/26/00 <50 <0 50 <0 50 <0 50 <0 50 no no no no na no no no no 4892 -2827 no odor I no sheen 12/20100 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no no no 4761 2696 no odor I no sheen 03/27/01 <50 <0 50 066 <0 50 <0 50 <5 0 no no no no no na no no 4639 2574 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 <50 1 8 <0 50 4896 2831 no odor 1 no sheen 09/05/01 64 055 <0 50 <0 50 086 <50 no no no no no na no no 5409 3344 no odor I no sheen 11/30/01 87 <0 50 <0 50 <0 50 <0 50 <50 no na no no no no no na 5408 3365 no odor 1 no sheen 02/27/02 93 <0 50 <0 50 <0 50 <0 50 <5 0 na no no no no no no no 5081 3016 no odor 1 no sheen 05116/02 86 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 <0 50 <0 50 5095 2221 2874 no odor 1 no sheen 09/13/02 110 <0 50 <0 50 <0 50 <0 50 <5 0 no no na na no no no no 5897 3676 no odor 1 no sheen 12/04/02 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no na na no no no 5733 3512 no odor I no sheen 02117/03 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 3133 no odor 1 no sheen 09/18/03 100 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no na no no no 5978 3757 no odor 1 no sheen 11/24/03 120 <0 50 <0 50 <0 50 <0 50 <0 50 no no no no no no no no 5851 3630 no odor 1 no sheen 9gni-03 45 Page 6 o`13 HORIZON ZXV1RONMENTAL INC