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0 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 EDBGW Elevation Elevation Number Date (ug1L) (ug1L) (ug/L) (ug/L) (ug/L) (ug/L) (ug1L) (ug/L) (ug/L) (ug/L) (ug1L) (ug/L) (ug1L) (ul;VQ (feet) (feet sea level) (feet sea level) Comments MW-3 03131198 780 22 2 32 7 <50 no no no na no no no na 4827 2138 2689 screened 06110/98 220 26 18 056 18 <50 no no no na na na na na 4267 21 29 Interval 09108198 3800 420 180 260 280 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 no no 4721 2583 etroleum odor 1 no sheen 65 85 11112198 as ns as ns as ns as as ns ns ns ns as ns 2065 wellhead survey 12/30/98 620 18 099 17 14 <5 0 no no no no no no no no 4556 2491 slight odor I no sheen 03126M 63 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 56 <50 <50 no no 4126 2061 slight odor!no sheen 06!02!99 74 1 7 13 23 078 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 31 <0 50 4076 2011 slight odor/no sheen 08131199 3000 270 120 260 250 <0 50 <0 50 <0 50 <0 50 6 9 <50 <50 48 <0 50 4570 2505 no comment 12109/99 <50 17 <0 50 <0 50 <0 50 .4050 <0 50 <0 50 .050 <5 0 <50 <50 12 <0 50 4722 2657 02/21/00 1600 160 350 43 140 <0 50 <0 50 <0 50 <0 50 <50 <50 10 14 64 4569 2504 slight odor!no sheen 05118110 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 -50 <50 450 no no 4087 2022 no odor I no sheen 09126!00 270 92 28 15 16 <5 0 no no no no no no no no 4899 2834 no odor/no sheen 12121100 830 45 19 45 <0 50 <5 0 no no no no no no no no 4759 2694 slight odor I no sheen 03/27/01 280 6 096 072 25 <5 0 no no no no no no no no 4654 2589 slight odor!no sheen 06/26/01 2900 270 55 160 330 <0 50 <0 50 <0 50 <0 50 56 <50 <5 0 12 <0 50 4953 2888 slight odor 1 no sheen 09/05/01 18000 2700 2000 860 2200 <25 no no no no no no no no 5431 3366 slight odor/no sheen 11130/01 3500 550 23 100 270 <25 no no no no no no no no 5393 -3334 no odor/no sheen 02127!02 290 73 36 44 37 <5 0 no no no na na na no no 5080 30 21 no odor 1 no sheen MW-4 03/31/98 75 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no no no 4792 2000 2792 screened 06/10198 5B <0 50 <0 50 <0 50 <0 50 <50 no no no no no no na no 4221 2221 Interval WARM 50 13 14 <0 50 24 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 no no 4664 2664 no odor 1 no sheen 48 70 11112198 ns as ns ns as ns ns as ns ns ns ns ns as 20 00 wellhead survey 12130!98 68 14 087 <0 50 1 1 <5 0 no no no no no no no no 4500 2500 no odor!no sheen 03128/99 74 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 o <50 <20 no no 4075 -2075 no odor 1 no sheen 06/07/99 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 32 <0 50 4019 2019 no odor 1 no sheen 08131/99 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 t) 43 <0 50 4509 2509 no comment 12109/99 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 69 <50 <5 0 49 <0 50 4656 2656 02/21/00 68 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 -050 <0 50 <5 0 <50 <50 30 <0 50 4494 2494 no odor 1 no sheen 05118/00 62 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 no no 3923 1923 no odor/no sheen 09/26100 <50 <0 50 <0 50 <0 50 <0 50 <50 no no no no no no no no 4855 2855 no odor 1 no sheen 12/20100 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no na no no no no no no 4698 2698 no odor/no sheen 0327101 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no na no no no no 4571 25 7t no odor/no sheen 06/16/01 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 <0 50 <0 50 4840 2840 no odor 1 no sheen 09/05101 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no no no 5355 3355 no odor 1 no sheen 11130101 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no no no 5339 -3339 no odor 1 no sheen 02/27/02 <50 <0 50 <0 50 <0 50 <0 50 <50 no no na no no no no no 5009 3009 no odor 1 no sheen 419WrI01 AS 141245 Page 2 of 7 HORIZON ENVIRONMENTAL INC