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TA& GROUNDWATER MONITORING DATA Former Beacom Station No 12419 2350 Waterloo Road,Stockton,California ethyl- Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPS ET8E TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ug1L) (ug1L) (ug/L) (ug/L) (ug1L) (ug1L) (ug1L) (ugIL) (ug/L) (ug1L) (ug1L) (ug1L) (ug/L) (ug/L) (feet) (feet sea level) (feet sea level) Comments MWS 11/12/98 ns ns ns ns ns ns AS ns ns ns ns ns ns ns 2038 wellhead survey screened 12130/98 68 12 076 <0 50 081 <5 0 na na na na na na na na 4536 -2498 no odor I no sheen interval 03/26/99 58 <0 50 <0 50 <0 50 <0 50 51 <0 50 4050 <0 50 <5 0 <50 <10 na na 41 08 -2070 no odor I no sheen 41 -66 06/02/99 <50 <0 5o <0 50 <0 50 <0 50 29 <0 50 <0 50 <0 50 <5 0 <50 <5 0 86 <0 50 4052 -2014 no odor I no sheen 08/31/99 <50 <0 50 <0 50 <0 50 <0 50 16 <0 50 <0 50 <0 50 <5 0 <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 02/21/00 210 <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 I no sheen 05/18/00 53 <0 50 <0 50 <0 50 <0 50 18 <0 50 <0 50 <0 50 <5 0 <50 <5 0 na na 4054 -2016 no odor 1 no sheen 09/26100 68 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4913 2875 no odor 1 no sheen 12/20100 <50 <0 50 051 <0 50 <0 5o <5 0 na na na na na na na na 4752 2714 no odor I no sheen 03/27/01 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4613 2575 no odor I no sheen 06/26/01 <50 <0 50 <0 50 <0 50 <0 50 16 <0 50 <0 50 <0 50 <5 0 <50 <5 0 57 <0 50 4876 -2838 no odor 1 no sheen 09/05/01 1800 200 25 65 250 <5 0 na na na na na na na na 5384 -3346 no odor I no sheen 11/30101 370 65 <0 50 60 083 10 ne na na na na na na na 5386 -3348 no odor!no sheen 02/27/02 90 <0 50 <0 50 <0 50 <0 50 66 na na na na na na na na 5049 -3011 no odor I no sheen 05/16/02 76 <0 50 13 <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 1 no sheen 09/13/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5854 -3660 dry 12104/02 360 1 2 1 3 26 <0 50 77 ns ns ns ns ns ns ns ns 5709 -3515 no odor I no sheen 02/17/03 120 <0 50 3 1 <0 50 <0 50 61 na na na na na na na na 5389 -31 95 no odor I no sheen 06/03/03 100 <0 50 <0 50 <0 50 <0 50 57 <0 5o <0 50 40 50 <5 0 <50 <5 0 73 <0 50 5322 31 28 no odor 1 no sheen 09118/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 11/24/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5835 3641 not sampled 02123104 100 <0 50 <0 50 <0 50 <0 50 40 40 50 <0 50 <0 50 51 <50 <5 0 54 <0 50 5481 -3287 no odor 1 no sheen 06107/04 70 <0 50 058 <0 50 <0 50 <5 0 na na na na na na na na 5502 -3308 no odor I no sheen rp 419gmr04 Nis Probed No 1419 47 Page 8 of 13 HORIZON ENVIRONIIIBATAL INC