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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 TPNg benzene toluene benzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (ug/L) (ug1L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug1L) (ug/L) (ug1L) (uo/L) (ug/L) (ug/L) (feet) (feet sea level) (feet sea level) Comments MW 9 11/12198 as ns ns ns ns ns as ns ns ns ns ns ns ns 2065 wellhead survey screened 12/30198 1500 73 18 160 64 <25 0 na na na na na na na na 4559 2494 slight odor 1 no sheen interval 03126/94 1 1300 54 58 110 15 <0 50 -050 <0 50 <0 50 11 <50 <50 na na 4139 2074 no odor 1 no sheen 41 66 06102!99 1300 16 25 76 24 <0 50 <0 50 <0 50 <0 50 13 <50 <50 16 <0 50 4074 2009 no odorno sheen 08/31/99 2400 140 21 460 280 055 -050 <0 50 <0 50 93 <50 <50 42 <0 50 4562 2497 no comment 12109/99 1600 86 65 200 62 079 <050 <0 50 <0 50 10 <50 '50 13 <0 50 4726 2661 02/21/00 1900 5018 100 60 055 <050 <0 50 <0 50 10 <50 88 95 <0 5D 4581 2516 slight odor 1 no sheen 05!18100 790 96 181 76 21 <0 50 <0 50 <0 50 <0 50 12 <50 <5 0 na na 4089 2024 slight odor 1 no sheen 09126!00 680 1 1 <0 50 3 1 087 <50 na na na na na na na na 4895 2830 slight odor 1 no sheen 1221100 1400 16 11 40 120 <50 na na na na na na na na 4762 2697 slight odor 1 no sheen 03/27/01 1700 61 14 23 220 <50 na ha na na na na na na 4637 2572 slight odor I 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 1 no sheen 09/05/01 410 1 1 <0 50 <0 50 46 <5 0 na na na na na na na na 54 11 3346 no odor I no sheen 11/30/01 750 72 14 31 15 -50 na na na na na na na na 5411 3346 no odor!no sheen 021271D2 850 12 35 14 23 <5 0 na na na na na na na na 5078 3013 no odor/no sheen 05116/02 1100 72 1 0 31 67 <0 50 <0 50 <0 50 <0 50 58 <50 <50 12 <0 50 5092 2221 2871 no odor 1 no sheen MW10 12102198 as ns ns ns ns ns ns ns ns ns ns ns ns ns 2087 wellhead survey screened 12130198 180 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4584 2497 no odor I no sheen interval 03!26199 140 064 <0 50 <0 50 072 <0 50 <0 50 <0 50 <0 50 92 <50 <5 0 na na 41 65 2078 no odor 1 no sheen 41 66 06102!99 160 <0 50 <0 50 <0 50 <0 50 -050 <0 50 <0 50 <0 50 12 <50 <50 94 -050 4096 2009 no odor 1 no sheen 08/31/99 120 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 93 <50 <50 65 <0 50 4574 2487 no comment 12109!99 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 0201100 55 <0 50 <0 50 <0 50 '050 <0 50 <D 50 1050 <0 50 <5 n <50 <5 0 33 <0 50 4591 2504 no odor I no sheen 05118/00 <50 <0 50 31 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 na na 41 11 2024 no odorino sheen 09!26100 ns ns ns as ns ns ns ns ns ns ns ns ns ns nm nm well access blocked 12/20100 <50 <0 50 7 D <0 50 <0 50 -50 na na na na na na na na 4789 2702 no odor I no sheen 03127/01 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 47 62 2675 no odor/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 <D 50 <0 50 4905 2818 no odor I no sheen 09105101 <50 <0 50 14 <0 50 <0 50 <5 D na na na na na na na na 5405 3318 no odor I no sheen 11130101 <50 <D 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 5437 3350 no odor I no sheen 02/26/02 <50 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 5101 3014 no odor 1 no sheen 45/16102 1000 10 110 22 130 270 <0 50 <0 50 25 56 <150 <5D 066 <0 50 5099 2242 2857 no odor!no sheen 419gmr01 xis 141945 Page 5 of 7 HORIZON ENVIRONMENTAL INC