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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 DIPS ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Dumber Date I (uglQ (uglL) (ug1L) (uglL) (ug1L) (ug1L) (u 1L) (uglL) (uglL) (ug/Q1 (ug1L) (ug1L) (ug1L) (ug1L) (feet) (feet sea level)(feet sea level) Comments MW-5 03/31198 75 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4846 2043 -2803 screened 06110f98 <50 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 4272 -2229 interval 09/08198 <50 1 2 091 <0 50 094 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 na na 4692 2649 no odor 1 no sheen 48'-71' 11/12/98 2043 wellhead survey 12/30/98 110 067 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4545 -2502 no odor 1 no sheen 03/26/99 67 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <20 na na 41 26 2083 no odor 1 no sheen 06/02/99 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 71 <0 50 4061 -2018 no odor I no sheen 08/31199 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 16 <0 50 4549 -2506 no comment 12/09/99 140 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 200 <0 50 4704 -2661 02/21/00 140 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 190 <0 50 4547 -2504 no odor 1 no sheen 05/18/00 <100 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 12 <100 <10 na na 4071 -2028 no odor/no sheen 09/26/00 64 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4882 -2839 no odor 1 no sheen 12/20/00 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4741 -26 98 no odor 1 no sheen MW-6 03131/98 110 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 4836 2066 -2770 screened 06/10/98 79 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 4268 -2202 interval 09/08/98 <50 086 077 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 na na 4697 -2631 no odor 1 no sheen 48'-71 5 11112/98 2065 wellhead survey 72/30/98 53 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4557 -2492 no odor 1 no sheen 03/26/99 84 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 na na 41 25 -2060 no odor!no sheen 06/02/99 59 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 <0 50 <0 50 4071 -2006 no odor 1 no sheen 08/31199 63 <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 4557 -2492 no comment 12/09/99 <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 4729 -2664 02/21/00 690 29 120 20 87 <0 50 <0 50 <0 50 <0 50 <5 0 <50 20 1 1 16 4569 -2504 no odor 1 no sheen 05/18/00 <50 <0 50 23 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 na na 4084 -2019 no odor 1 no sheen 09/26100 <50 <0 50 <0 50 <0 50 <0 50 na na na na na na na na na 4892 -2827 no odor 1 no sheen 12/20100 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4761 -2696 no odor 1 no sheen 419gmrGO As1 141s 4t Page 3 of 6 HORIZON ENVIRONMENTAL INC