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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) (ugll-) (ug/L) (ug/L) (ugll-) (uglL) (feet) (feet sea level) (feet sea level) Comments MW-7 11!12198 2055 wellhead survey screened 12/30/98 340 48 1 74 22 <5 0 na na na na na na na na 4543 -2488 no odor 1 no sheen interval 03/26/99 550 94 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 23 <50 <5 0 na na 41 33 -2078 no odor I no sheen 41'-66' 06102/99 230 <0 50 <0 50 <0 50 <0 50 1 1 <0 50 <0 50 <0 50 28 <50 <5 0 270 <0 50 4076 2021 no odor 1 no sheen 08131/99 120 <0 50 <0 50 <0 50 <0 50 1 2 <0 50 <0 50 <0 50 13 <50 <5 0 160 <0 50 4556 -2501 no comment 12/09/99 130 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 12 <50 <5 0 98 <0 50 4714 -2659 02/21/00 130 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 84 <50 <5 0 96 <0 50 4556 -2501 no odor I no sheen 05/18/00 120 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 68 <50 <50 na na 4078 -2023 no odor/no sheen 09126100 68 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4889 -2834 no odor 1 no sheen MW-8 11112198 2038 wellhead survey screened 12/30/98 68 1 2 076 <0 50 081 <50 na na na na na na na na 4536 -2498 no odor/no sheen interval 03/26/99 58 <0 50 <0 50 <0 50 <0 50 51 <0 50 <0 50 <0 50 <50 <50 <10 na na 41 08 -2070 no odor I no sheen 41 -66' 06/02/99 <50 <0 50 <0 50 <0 50 <0 50 29 <0 50 <0 50 <0 50 <50 <50 <5 0 86 <0 50 4052 -20 14 no odor/no sheen 08/31199 <50 <0 50 <0 50 <0 50 <0 50 16 <0 50 <0 50 <0 50 <50 <50 <5 0 54 <0 50 4544 -2506 no comment 12/09199 <50 <0 50 <0 50 <0 50 <0 50 14 <0 50 <0 50 <0 50 <50 <50 <5 0 60 <0 50 4701 -2663 02/21/00 210 <0 50 <0 50 <0 50 <0 50 20 <0 50 <0 50 <0 50 <50 <50 <5 0 69 <0 50 4538 -25 00 no odor 1 no sheen 05/18/00 53 <0 50 <0 50 <0 50 <0 50 1 8 <0 50 <0 50 <0 50 <5 0 <50 <5 0 na na 4054 2016 no odor 1 no sheen 09/26/00 68 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4913 2875 no odor 1 no sheen MW-9 11112/98 2065 wellhead survey screened 12/30/98 1500 73 18 160 64 <25 0 na na na na na na na na 4559 -2494 slight odor/no sheen interval 03/26/99 1300 54 58 110 15 <0 50 <0 50 <0 50 <0 50 11 <50 <5 0 na na 41 39 -2074 no odor/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 08/31/99 2400 140 2 1 460 280 055 <0 50 <0 50 <0 50 93 <50 <5 0 42 <0 50 4562 -2497 no comment 12/09/99 1600 86 65 200 62 079 <0 50 <0 50 <0 50 10 <50 <5 0 1 3 <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 na na 4089 -2024 slight odor/no sheen 09/26/00 680 1 1 <0 50 31 087 <5 0 na na na na na na na na 4895 -2830 slight odor 1 no sheen 419gmrOO xis 141941 Page 4 of 6 HORIZON ENVIRONMENTAL INC