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A 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 ethanol EDC EDB GW Elevation Elevation Number Date (ug1L) uglL) (ug1L) (u IL) (ug1L) (ug1L) (ug1L) (ug1L) (ug[L) (ug/ (ug1L) (uglL) (ug1L) (u IL) (feet) (feet sea level) (feet sea level) Comments MW9 111/12/98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 2065 wellhead survey screened 112!30!98 1500 73 18 160 64 <25 0 no no no na no na na no 4559 2494 slight odor!no sheen interval 03126/99 1300 54 58 110 15 <0 50 <0 50 <0 50 <0 50 11 <50 <50 no no 4139 2074 no odor 1 no sheen 41 -66' 06702!99 1300 16 25 76 24 <0 50 <0 50 <0 50 <0 50 13 <50 <50 16 <0 50 4074 2009 no odor l no sheen 08/31199 2400 140 2 1 460 260 055 <0 50 <0 50 <0 50 93 <50 <5 0 42 <0 50 4562 2497 no comment 12109199 1600 86 65 200 62 079 <0 50 <0 50 <0 50 10 <50 <50 13 <0 50 4726 -2661 02/21100 1900 50 18 100 60 055 <0 50 <0 50 <0 50 10 <50 88 95 <0 50 4581 2516 slight odor 1 no sheen 0511 BI00 790 96 081 76 21 <0 50 <0 50 <0 50 <0 50 12 <50 <50 no no 4089 2024 slight odor 1 no sheen D9/26100 680 1 1 <0 50 31 087 <50 no no no no no no no no 4895 -2830 sight odor I no sheen 12121/00 1400 116 1 1 40 120 <50 na na no no na no no na 4762 -2697 slight odor 1 no sheen 03/271011700 61 14 23 220 <50 no no no no no no na na 4637 -2572 slight odor 1 no sheen 06/26/01 390 51 065 44 27 <0 50 <0 50 <0 50 <0 50 85 <50 <50 68 <0 50 4899 -2834 sight odor 1 no sheen 09/05/01 410 1 1 -4050 <0 50 46 <5 0 na no no na no no no no 5411 -3346 no odor!no sheen 11/30/01 750 72 14 31 15 <5 0 no no na na no na na na 5411 -3346 no odor 1 no sheen 02/27/02 850 12 35 14 23 <5 0 no no no no no no no na 50 78 -3013 no odor 1 no sheen 05116102 1100 72 10 31 67 <0 50 <0 50 <0 50 <0 50 58 <50 <5 0 12 <0 50 5092 2221 -2871 no odor I no sheen 09/13/02 2800 110 33 130 200 <50 no na no no no na no na 5908 3687 slight odor 7 no sheen 12/04/02 980 31 15 21 39 <5 0 na no no no na no no no 5734 3513 odor Ino sheen 02117/03 900 20 14 42 26 <0 50 na no na no no na no no 5408 3187 no odor I no sheen MW-10 12/02/98 ns ns ns ns ns AS ns ns ns ns ns ns ns ns 2087 wellhead survey screened 12!30!98 180 <0 50 <0 50 <0 50 <0 50 <5 0 no na no no na no no no 4584 2497 no odor I no sheen interval 03126!99 140 064 <0 50 <0 50 072 <0 50 <0 50 <0 50 <0 50 92 <50 <5 0 no no 41 65 -2078 no odor!no sheen 41 -66 06102799 160 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 12 <50 <5 0 94 <0 50 4096 -20 09 no odor I no sheen 08/31199 120 <0 50 <0 50 <0 50 <0 50 4 50 <0 50 <0 50 <0 50 93 <50 <50 65 <0 50 4574 -2487 no comment 12IM199 56 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 26 <0 50 4746 -2659 no comment 02/21/00 55 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 33 <0 50 4591 2504 no odor!no sheen 05/18/00 <50 -'050 31 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 no no 41 11 2024 no odor/no sheen 091261D0 ns AS ns ns ns ns ns ns ns ns ns ns ns ns nm nm well access blocked 12/20100 <50 <0 50 70 <0 50 <0 50 <5 0 no na no no no na no na 4789- 2702 no odor!no sheen 03/27/01 <50 <0 50 <0 50 <0 50 <0 50 <50 no no no no no na no na 4762 2675 no odor 1 no sheen 06/26/01 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 <0 50 <0 50 4905 -2818 n0 odor I no sheen 09/05/01 <50 <0 50 14 <0 50 <0 50 <5 0 no no no no na no no no 5.405 3316 no odor I no sheen 11/30/01 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na no na no 5437 3350 no odor I no sheen 02/26/02 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no na no na no no no no 5101 -3014 no odor!no sheen 05/16102 1000 10 110 22 130 270 <0 50 <0 50 25 56 <150 <5 0 066 <0 50 5099 2242 -2857 no odor!no sheen 09!12!02 58 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no na no na no 5891 3649 no odor 1 no sheen 12104102 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no na no no na no no na 5756 -3514 no odor 1 no sheen 02117103 <50 <0 50 <0 50 <0 50 <0 50 <0 50 no no na no no na no no 5444 -3202 no odor I no sheen 419gmr02 h1r Protect No WO 45 Page 5 of 7 HORIZON NXVIROlflf! NTAL INC