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iTA& 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 ETRE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (uglL) (uglL) (uglL) (uglL) (ug1L) (uglL) (ug/L) (ug/L) (uglL) (uglL) (ug1L) (ug1L) (uglL) (ug1L) (feet) (feet sea level) (feet sea level) Comments MW-9 11/12/98 ns ns ns ns ns ns ns ns ns ns ns AS ns ns 2065 wellhead survey screened 12/30/98 1500 73 is 160 64 <25 0 no no no no no no no no 4559 2494 slight odor 1 no sheen interval 03/26/99 1300 54 58 110 15 <0 50 <0 50 <0 50 <0 50 11 <50 <5 0 no no 4139 -2074 no odor 1 no sheen 41 -66' 06/02/99 1300 16 25 76 24 <0 50 <0 50 <0 50 <0 50 13 <50 <5 0 16 <0 50 4074 -2009 no odor 1 no sheen 08131199 2400 140 21 460 280 055 <0 50 <0 50 <0 50 93 <50 <5 0 42 <0 50 4562 2497 no comment 12109/99 1600 86 65 200 62 079 <0 50 <0 50 <0 50 10 <50 <5 0 13 <0 50 4726 -2661 02/21/00 1900 50 18 100 60 055 <0 50 <0 50 <0 50 10 <50 88 95 <0 50 4581 -2516 slight odor!no sheen 05/18/00 790 96 081 76 21 <0 50 <0 50 <0 50 <0 50 12 <50 <5 0 no no 4089 -2024 slight odor 1 no sheen 09/26/00 680 1 1 <0 50 3 1 087 <5 0 no no no no no no no no 4895 -2830 slight odor I no sheen 12/21100 1400 16 1 1 40 120 <50 no no no no no no na no 4762 -2697 slight odor I no sheen 03/27/01 1700 61 14 23 220 <5 0 no no no no no no na no 4637 -2572 slight odor!no sheen 06/26/01 390 51 065 44 27 <0 50 <0 50 <0 50 <0 50 85 <50 <5 0 68 <0 50 4899 -2834 slight odor I no sheen 09/05/01 410 1 1 <0 50 <0 50 46 <5 0 no no no na no no no no 5411 -3346 no odor I no sheen 11/30/01 750 72 14 31 15 <5 0 no no no na no no no no 5411 -3346 no odor 1 no sheen 02127/02 850 12 35 14 23 <5 0 no no no as no no no no 5078 -3013 no odor 1 no sheen 05116/02 1100 72 1 0 3 1 67 <0 50 <0 50 <0 50 <0 50 58 <50 <5 0 12 <0 50 5092 2221 -2871 no odor 1 no sheen 09/13/02 2800 110 33 130 200 <5 0 no no no no no no no na 59 OB 3687 slight odor I no sheen 12/04/02 980 31 15 21 39 <5 0 no no no na no no no no 5734 35 13 odor I no sheen 02/17/03 900 20 14 42 26 <0 50 no no no no no no no no 5408 3187 no odor 1 no sheen 06/03/03 2800 140 17 130 120 <0 50 <0 50 <0 50 <0 50 58 <50 <5 0 15 <0 50 $347 3126 no odor!no sheen 09/18/03 2800 430 23 79 170 <5 0 no no no no no no no no 5991 3770 no odor!no sheen 11/24/03 1800 190 27 19 76 <050 na no no no no no no no 5066 -3645 no odor!no sheen 02/23/04 1200 40 075 77 59 <0 50 <0 50 <0 50 <0 50 67 <50 <5 0 26 <0 50 5515 -3294 odor 1 no sheen 06/07/04 2200 420 57 44 92 <10 no no no no no no no no 5557 -3336 odor Ino sheen 419gmr04 As Project No 141047 Page 9 of 13 HORIZON ENVilt011131 rrAL INC