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TAO 1 0 , GROUNDWATER MONITORING DATA Former Beacon Station No 12419 2350 Waterloo Road, Stockton, California ethyl- Depth to TOC GW Well PHg benzene toluene benzene xylenes MTBE DIP6 ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number[:a(,g1L) (ug1L) (ug1L) (uglL) (ug1L) (uglL) (uglL) (ug1L) (ug1L) (ug/L) (uglL) (ug1L) (ug1L) (ug1L) (feet) (feel sea level) (feet sea levet) Comments VW-8 11/12/98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 2038 wellhead survey screened 12/30/98 68 1 2 076 <0 50 081 <5 0 na na na na na na na na 4536 2498 no odor 1 no sheen interval 03/26/99 58 <0 50 <0 50 <0 50 <0 50 51 <0 50 <0 50 <0 50 <5 0 <50 <10 na na 4108 -2070 no odor 1 no sheen 41 fib 06/02199 <50 <0 50 <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 1 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 <50 <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 <5D <50 <5 0 69 <0 50 4538 2500 no odor!no sheen 05/18/00 53 <0 50 <0 50 <0 50 <0 50 18 <0 50 <0 50 <0 50 <50 <50 <5 0 na na 4054 2016 no odor 1 no sheen 09/26/00 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 12120/00 <50 <0 50 051 <0 50 <0 50 <5 0 na na na na na na na na 4752 2714 no odor 1 no sheen 03127/01 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4613 -2575 no odor 1 no sheen 06126/01 <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!05101 1800 200 25 65 250 <5 0 na na na na na na na na 5384 3346 no odor 1 no sheen 11/30/01 370 65 <0 50 60 083 10 na na na na na na na na 5386 3348 no odor 1 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!no sheen 05/16/02 76 <0 50 1 3 <0 50 <0 50 46 <0 50 <0 50 <0 50 <50 <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 12/04/02 360 1 2 1 3 26 <0 50 77 ns ns ns ns ns ns ns ns 5709 3515 no odor!no sheen 02/17/03 120 <0 50 31 <0 50 <0 50 61 na na na na na na na na 5389 -3195 no odor!no sheen 06/03/03 100 <0 50 <0 50 <0 50 <0 50 57 <0 50 <0 50 <0 50 <50 <50 <5 0 73 <0 50 5322 -3128 no odor!no sheen 09/18103 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 I ..�cim 03 Page o"3 HORIZON E1fi MONMENTRL INC