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TO , • ,< 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 DCA EDS GW Elevation Elevation Number Date u 1L) (u 1L u 1L (u 1L) (u IL u 1L ( IL (ug1L} u IL (u 1L) (u !L u !L) (u IL) (u !L) (feet) feet sea level feet sea level) Comments MW 7 11/12198 ns ns ns ns ns ns ns ns ns ns ns ns AS ns 2055 wellhead survey screened 12/30/98 340 48 1 74 22 <50 na na na na na na na no 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 <50 na na 4133 2078 no odor 1 no sheen 41 66 06102199 230 <0 50 <0 50 <0 50 <0 50 1 1 <0 50 <0 50 <0 50 28 <50 <50 270 <0 50 4076 2021 no odor 1 no sheen 08!31199 120 <0 50 <0 50 <0 50 <0 50 12 <0 50 <0 50 <0 50 13 <50 <50 160 <0 50 4556 2501 no comment 12/09/99 130 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 'Co 50 12 <50 <5 0 98 <0 50 4714 2659 02/21100 130 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 84 <50 <50 96 <0 50 4556 2501 no odor 1 no sheen 05118!00 120 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 68 <50 <5 0 na na 4078 2023 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 4889 -2834 no odor I no sheen 12/20/00 87 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4751 2696 no odor I no sheen 03/27/01 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4537 -2582 no odor 1 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 <50 33 <0 50 4903 -2848 no odor 1 no sheen 09105/01 68 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 5406 -3351 no odor I no sheen 11/30/01 97 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5401 3346 no odor I no sheen 02/26102 56 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 5065 3010 no odor I no sheen 05116/02 87 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 26 <0 50 5071 2211 -2860 no odor/no sheen 09/12/02 77 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 5873 3662 no odor 1 no sheen 12/04/02 <50 <0 50 <0 50 <0 50 <0 50 <50 na na no na na na na no 5724 3513 no odor 1 no sheen 02117/03 <50 <0 50 <0 50 <0 50 <0 50 <0 50 na na na na na na na na 5408 3197 no odor 1 no sheen 06102/03 <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 5331 3120 no odor I no sheen 09118103 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no na na na na na na na $963 3752 no odor I no sheen 11/24103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5844 3633 not sampled 02123104 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 12 70 <0 50 5497 -3286 no odor I no sheen 06107104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5517 3306 not sampled 09/07104 <50 <0 50 <0 50 <0 50 <0 50 070 na na na na na na na na 6062 3851 no odor I no sheen 12110104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5942 3731 not sampled 03108105 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 57 <0 50 5585 3374 odor I no sheen 05/24105 ns ns ns ns ns ns his ns ns ns ns ns ns ns 5094 2883 not sampled NS xis Propot HORIZON ENVIRONMENTAL INC Pm1ad No 1478 4B Page 7 of 13