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• To 1 , , GROUNDWATER MONITORING DATA Former Beacon Station No 12419 2350 Waterloo Road,Stockton,California ethyl Depth to TOC GW Welt TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanal RCA EDB GW Elevation Elevation Number Date (ug/L) (ug/L) (ug/L) (uglL) (ug1L) (ug1L) (ug1L) (uglL) (ug1L) (ug/L) (ug1L) (ug/L) (ug1L) (ug/L) (feet) (feet sea levet) (feet sea level) Comments MW-8 11/12/98 ns ns ns ns ns AS ns ns ns ns ns ns ns ns 2038 wellhead survey screened 12/30/98 68 12 076 <0 50 081 <5 0 no no no no no no no na 4536 ? 2498 no odor 1 no sheen interval 03/26/89 58 <0 50 <0 50 <0 50 <0 50 51 <0 50 <0 50 <0 50 <5 0 <50 <10 no no 4108 2070 no odor I no sheen 41 -66 06/02/99 <50 <0 50 <0 50 <0 50 <0 50 29 <0 50 <0 50 <0 50 <5 0 <50 <5G 86 <0 50 4052 20 14 no odor/no sheen 08/31/99 <50 4050 <0 50 <0 50 <0 50 16 <0 50 <0 50 <0 50 <50 <50 <5 0 54 <0 50 4544 2506 no comment 12/09/99 <50 <0 50 <0 50 <0 50 <0 50 14 <0 50 <0 50 <0 50 <5 0 <50 <5 0 60 <0 50 4701 2663 02121/00 210 <0 50 <0 50 <0 50 <0 50 20 <0 50 <0 50 <0 50 <5 0 <50 <5 0 69 <0 50 4538 -2500 no odor 1 no sheen 05118/00 53 <0 50 <0 50 <0 50 <0 50 1 8 <0 50 <0 50 <0 50 <5 0 c50 <5 0 no no 4054 -20 16 no odor 1 no sheen 09126/00 68 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no na no 49 13 2875 no odor!no sheen 12/20/00 <50 <0 50 051 <0 50 <0 50 <5 0 no no no no no no no no 4752 27 14 no odor I no sheen 03/27/01 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no na no 46 13 2575 no odor!no sheen 06/26/01 <50 <0 50 <0 50 <0 50 <0 50 1 6 <0 50 <0 50 <0 5o <5 0 <50 <5 0 57 <0 50 4876 2838 no odor/no sheen 09/05/01 1800 200 25 65 250 <5 0 no no no no no no no na 5384 3346 no odor 1 no sheen 11/30/01 370 65 <0 50 60 083 10 no no no no no no no no $356 3348 no odor 1 no sheen 02/27102 90 <0 50 <0 50 <0 50 <0 50 66 no no no no no no no no 5049 30 11 no odor I no sheen 05116102 76 <0 50 1 3 <0 50 <0 50 46 <0 50 <0 50 <0 50 <5 0 <50 <5 0 58 <0 50 5061 21 94 2867 no odor!no sheen 09/13/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5854 -3660 dry 12/04/02 360 1 2 13 26 <0 50 77 ns ns ns ns ns ns ns ns 5709 -35 15 no odor 1 no sheen 02/17/03 120 <0 50 31 <0 50 <0 50 61 no na no no no no na no 5389 -31 95 no odor 1 no sheen 06/03/03 100 <0 50 <0 50 <0 50 <0 50 57 <0 50 <0 50 <0 50 <5 0 <$0 <5 0 73 <0 50 5322 3128 no odor 1 no sheen 09/18/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 11124/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5835 3641 not sampled 02/23/04 100 <0 50 <0 50 <0 50 <0 50 40 <0 50 <0 50 <0 50 51 <50 <50 54 <0 50 5481 3287 no odor/no sheen 06/07/04 70 <0 50 058 <0 50 <0 50 <5 0 no no no no no no no no 5502 3308 no odor/no sheen 09107104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry I IL 419gmiO4 As Prgecr No 1419 47 Page 8 of 13 HORIZON ENVIRONMENTAL INC