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TA 1 0 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 ethanal DCA EDB GW Elevation Elevation Number Date (ug1L) (ug1L) (ug/L) (ug1L) (ug/L) (uglL) (ug1L) (ug1L) (ug1L) (uglL) (uglL) (ug1L) (ug1L) (ug1L) (feet) (feet sea level) (feet sea level) Comments NW-8 1112!98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 2038 wellhead survey screened 12/30198 68 12 076 <0 50 081 <50 no no no no no no no no 4536 2498 no odor 1 no sheen interval 03/215199 58 <0 50 <0 50 <0 50 <0 50 51 <0 50 <0 50 <0 50 <50 <50 <10 no no 4108 -2070 no odor 1 no sheen 41 -66' 06/02/99 <50 <0 50 <0 50 <0 50 4050 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 <50 <50 <5 0 54 <0 50 4544 2506 no Comment 12109199 <50 <0 50 <0 50 <0 50 <0 50 14 <0 50 <0 50 <0 50 <50 <50 <50 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 1 no sheen 05/18/00 53 <0 50 <0 50 <0 50 <0 50 1 8 <0 50 <0 50 <0 50 <50 <50 <5 0 no no 4054 -2016 no odor 1 no sheen 09/26/00 68 <0 50 <0 50 <050 <0 50 <50 no na na no no no no no 4913 -2875 no odor 1 no sheen 12120/00 <50 <0 50 051 <0 50 <0 50 <50 no no no no no no no no 4752 2714 no odor!no sheen 03127/01 <50 <0 50 <0 50 <0 50 <0 50 <50 no no no no no no no no 4613 2575 no odor 1 no sheen 06/26101 <50 <0 50 <0 50 <0 50 <0 50 16 <0 50 <0 50 <0 50 <50 <50 <5 0 57 <0 50 4876 2838 no odor!no sheen 09/05/01 1800 200 25 65 250 <5 0 no na no no no no no no $384 -3346 no odor!no sheen 11130/01 370 65 <0 50 60 083 10 no no no no no no na no 5386 -3348 no odor 1 no sheen 02127/02 90 <0 50 <0 50 <0 50 <0 50 66 no no no na no no no no 5049 -3011 no odor 1 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 2194 2867 no odor 1 no sheen 09113/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5854 3660 dry 12/04/02 360 12 13 26 <0 50 77 ns ns Its ns ns ns ns ns 5709 3515 no odor 1 no sheen 02/17/03 120 <0 50 31 <0 50 <0 50 61 na no no no na na no 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 <50 <50 73 <0 50 5322 31 28 no odor 1 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 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 1 no sheen 419gmr04 AS Project No 1419 47 Page 6 of 13 HORIZON ENVIRONMENTAL INC