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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No.12474 3440 East Main Street,Stockton,California ethyl- total �j Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB! GW Elevation Elevation Number Date u 1L u 1L (Jill-) u 1L u !L u !L u 1L u 1L u IL u 11, u !L u 1L u 1L u IL feet feet msl feet tnsl Comments MW-7 03131198 <50 <0.50 <0.50 <0.50 <0.50 <5.0 no no no no no no na no 61.75 25.66 -36.09 r screened 06110!98 <50 E' <0.50 <0.50 -40.50 <0.50 <5.0 na no na na no no no no 59.04 -33.38 no odor 1 no sheen Interval 09108!98 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 na na 59.19 -33.53 no odor/no sheen 56'-76' 12130!98 <50 < <0.50 <0.50 <0.50 <0.50 <5.0 no no no no no na no na 57.18 -3t.52 no odor!no sheen 03125!99 <50 <0.50 <0.50 <0.50 <0.50 -40.50 <050 <0.50 <0.50 <5.0 <50 <5.0 no no 55.07 29.41 no comment Ofi103199 <50 <0.50 4.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 5.6 <0.50 54.61 -28.95 no comment 08!30199 <50 -40.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 2.1 <0.50} 56.85 31.19 no wmmenl 12/10/99 <50 <0.50 450 <0.50 <0.50 0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 4.7 <0.50 56.68 -31.02 no comment D3I03100 <50 -40,50 450 <0.50 <0.50 0.62 <0.50 <0.50 <0.50 <5.0 <50 <5.0 5.0 <0.50' 55.6 -29.95 no odor/no sheen 06/26100 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 9.4 4.0 <0.5d' 54.62 28.96 no odor 1 no sheen 09/28/00 <50 <0.50 <0.50 <0.50 <0.50 <5.D no no no no no na no na 56.93 -31.27 no odor lno sheen 10/20100 ns j ns ns ns ns ns ns ns ns ns ns ns ns ns nm 24.73 nm wellhead re-surveyed 12/22100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm no odor 1 no sheen 03128!01 73 6:2 i 17 1.5 7.5 <5.0 ns ns ns ns ns ns ns ns 54.73 -30.00 no odor/no sheen 06/27101 <50 <0.50 1.0 <0.50 <0.50 0.87 <0.50 <0.50 <0.50 <5.0 <50 <5.0 6.0 <0.50. 55.99 -31.26 no odor/no sheen 09/06/01 <50 <0.50 <0.50 <0.50 <0.50 <5.0 no no na no no no no nal 58.03 -33.30 no odor/no sheen 12/03/01 <50 <0.50 -40.50 <0.50 <0.50 <5.0 no no no no no na na na 58.41 -33.68 no odor 1 no sheen 02/28102 <50 <0.50 450 <0.50 <0.50 <5.0 no no no no no no no no 57.13 -32.40. no odor!no sheen 05/20/02 51 <0.50 1.9 <0.50 <0.50 0.92 <0.50 <0.50 <0.50 <5.0 <50 <5.0 15 -40.50 57.55 26.94 30.61 no odor/no sheen 08/29/02 <50 <0.50. 4,50 <0.50 <0.50 <5.0 no na no na no no na no 60.63 -33.69 no odor lno sheen 12/06102 <50 <0.50 450 <0.50 <0.50 0.96 no no no no na no na no 60.74 33.80 no odor lno sheen 03105103 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na no na no no no na no 59.71 -32.77 no odor!no sheen 06103!03 2400 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 4.50 <0.50 <5.0 <50 <5.0 4.7 <0.50 58.64 -31.70 no odor l no sheen 08/28/03 <50 ° <0.50 -40.50 <0.50 <0.50 <5.0 no no no na no no na na 61.04 -34.10 no odor lno sheen 11/25/03 63 ? <0.56 <0.50 <0.50 <0.50 0.63 na no no no no na na no 61.79 -34.85 no odor!no sheen 03/01104 <50 -40.50 1.3 <0.50 0.54 0.87 <0.50 <0.50 <0.50 <5.0 <50 <5.0 9.1 <0.50 60.47 24.91 35.56 no odor!no sheen 06108/04 110 <0.50 _ 450 <0.50 <0.50 <5.0 na no no no na no na no 60.98 -36.07 no odor l no sheen 09/08/04 63 t <0.50 -40.50 <0.50 <0.50 <5.0 no na no no no no no no 62.69 37.78 no odor 1 no sheen �I 12/09/04 89 <0.50 1.5 <0.50 <0.50 <5.0 no no no na no no no na 62.75 37.84 no odor/no sheen 03/10/05 73 <0.50 2.8 <0.50 `0.74 0.56 <0.50 <0.50 <0.50 <5.0 <50 <5.0 4.5 <0.50 61.50 -36.59 no odor lno sheen 05/26/05 79* -40.50 1 0 -40.50 -40.50 c5.0 no no na no no na no no 60.34 -35.43 no odor lno sheen 09102105 110, <0.50 <0.50 <0.50 <0.50 <5.0 na no no na na no no no 61.19 36.28 no odor 1 no sheen 12/14/05 87' <0.50 450 <0.50 <0.50 <5.0 na na no na no no no no 61.35 -36.44 no odor!no sheen 't 474gmr0 ' ftjectN104e Pagof 18 HORIZON ENVIIROL AL INC. I