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TABLE 1 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 (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/l-) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (feet) (feet sea level) (feet sea level) Comments MW 9 11/12198 as ns as ns ns ns ns as as as ns as ns as 2065 wellhead survey screened 12130/98 1500 73 18 160 64 <25 0 no no na no no na no no 4559 2494 slight odor Ino sheen interval 0326M 1300 54 58 110 15 <0 50 <0 50 <0 50 <0 50 11 <50 <5 0 no na 4139 2074 no odor I no sheen 6!'0 41 66 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 08!31!99 2400 140 21 460 280 055 <0 50 <0 50 <0 50 93 <50 <50 42 <0 50 4562 2497 no comment 12/09199 1600 86 65 200 62 079 <0 50 <0 50 <0 50 10 <50 <5 0 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 B/00 790 96 081 76 21 4060 <0 50 <050 <0 50 12 <50 <5 0 no no 4089 2024 slight odor I no sheen 09126100 680 11 <0 50 31 as? <50 na no no no no no no no 4895 28 30 slight odor I no sheen 12/21/00 1400 16 1 1 40 120 <5 0 na no no no no no no na 4762 -2697 slight odor/no sheen 03/27/01 1700 61 14 23 220 <50 no na no no no no no no 4637 2572 slight odor no sheen 06126!01 390 51 065 44 27 <050 <0 50 <050 <050 85 <50 <50 68 <0 50 4899 2834 slight odor I no sheen 09/05/01 410 11 <0 50 <0 50 46 <50 no no no no no no no no 54 11 3346 no odor I no sheen 1 il30/01 750 72 14 31 15 <50 no no no na no no no no 5411 3346 no odor!no sheen MW 10 i 2102198 as ns ns as no ns ns as as ns ns ns ns as 2087 wellhead survey screened 12130f98 180 <0 50 .4050 <0 50 <0 50 <50 no no no no na no no no 4584 2497 no odor 1 no sheen interval 03/26199 140 064 <0 50 <0 50 072 <0 50 <050 <0 50 <0 50 92 <50 <50 na no 4185 2078 no odor 1 no sheen 41 66 06102/99 160 <0 50 <0 50 <a 5o <0 50 <0 50 <O 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 1050 <0 50 <0 50 <0 50 <0 50 93 <50 <50 65 <0 50 Yo 74 24 B7 no comment 12109199 56 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 26 <0 50 4746 2659 no comment 02121/00 55 <0 50 <050 <0 50 <0 50 <0 50 <0 50 <050 <050 <50 <50 <50 33 <0 50 4591 2504 no odor I no sheen o5/1 a/00 <so <0 50 31 -050 <0 50 -050 <0 50 4050 <U50 <5 0 <50 <50 no no 4111 2024 no ododno sheen 0926/00 ns ns ns ns ns ns ns ns as ns as as ns ns nm nm well access blocked 1220100 <50 <0 50 70 <0 50 <0 50 <5 0 no na no no no no no no 4789 2702 no odor 1 no sheen 0327101 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no na no no na no no 4762 2675 no odor I no sheen 0626/01 <50 <0 50 .4050 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 <0 50 <0 50 4905 -2818 no odor 1 no sheen 09105101 <50 <0 50 14 <0 50 <0 50 <5 0 no no no no no no no no 5405 11/30101 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no na na no no no no 5437 -33 18 no odor no sheen -3350 no odor/1 no sheen MIN 11 10/20/00 240 1 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 14 <50 130 23 c0 50 4925 2057 2868 wellhead survey screened 12/21/00 300 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no no no 4759 2702 no odor 1 no sheen interval 03/27/01 190 <0 50 <0 50 <0 50 <0 50 <5 0 no no na no no no na no 4831 2574 no odor 1 no sheen 3t7 50 0626101160 <0 50 <0 50 <0 50 15 <0 50 <0 50 <0 50 <0 50 12 <50 17 16 <0 50 4882 2825 no odor I no sheen 09/05101 ns ns ns as as ns ns ns ns ns ns ns as ns nm nc well dry 11/30101 ns ns ns ns ns ns ns ns as ns as as as ns dry nm dry 419gmi01 ah 141944 Page 5 of 7 HORIZON ENVIRONMENTAL INC.