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TO 1 • 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 (ug1L) (ug/L) (ug1L) (ug/L) (uglL) (uglL) (uglL) (ug/L) (ug/L) (uglL) (uglL) (uglL) (uglL lL feet } (ug/L) (feet) {feet sea level} (feet sea Level) Comments MW-5 03!31198 75 <0 50 <0 50 <0 50 <0 50 <5 0 no na na no no no na no 4846 2043 2803 screened 06110198 <50 <0 50 <0 50 <0 50 <0 5o <50 no no na na no na no no 4272} -2229 interval 09/08198 <50 1 2 091 <0 50 094 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 na na 4692 -2649 no odor 1 no sheen 48 71 11112!98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 2043 wellhead survey 12/30/98 110 067 <0 50 <0 50 <0 50 <5 0 na no no no no na na no 4545 2502 no odor 1 no sheen 03126/99 67 <0 50 <0 50 <0 50 <0 50 <0 59 <0 50 <0 50 <0 So <5 0 <50 <20 no no 4126 2083 no odor 1 no sheen 06/02/94 c50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 54 c0 50 <5 0 <50 <5 0 71 <0 54 4061 20 18 no odor 1 no sheen 08131!99 <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 4549 2506 no comment 12/09/99 140 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 5a <5 0 <50 <50 200 <0 50 47 04 2661 02/21/00 140 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 190 <0 50 4547 -25 04 no odor!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 no na 4071 -2028 no odor!no sheen 09126/00 64 <0 50 <0 50 <0 50 <0 50 <5 0 no no na no no na no no 4882 -2839 no odorno sheen 12/20100 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no na na no na no no 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 46 19 -2576 no odor!no sheen 06126/01 <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 no na no no na na na 5379 -3336 no odor!no sheen 11!30!01 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na no na na no na na 5388 -3345 no odor I no sheen 02/27/02 <50 <0 50 062 <0 50 <0 50 <50 na no na na no na na no 5052 3009 no odor I no sheen 05/16/02 <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 2199 2863 no odor I no sheen 09/12/02 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no na na no na 5857 3658 no odor 1 no sheen 12!04102 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no na no no no no no no 57 11 35 12 no odor 1 no sheen 02/17/03 57 <0 50 <0 50 <0 50 <0 50 <0 50 no na na na na na na no 5403 3204 no odor!no sheen 06102103 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 30 <0 50 53 17 31 18 no odor 1 no sheen 09118/03 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 02!23104 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 5o <5 0 <50 <5 0 22 <0 50 5484 -3285 no odor 1 no sheen 06107!04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5504 3305 not sampled 09/07/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 61 53 3954 not sampled I 419gmr94 xis Project No 141947 Page 5 of 13 HORSZON FJMRONMENTAL INC