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TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No. 12474 3440 East Main Street,Stockton,California ethyl- total Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETSE TAME TBA methanol ethanol DCA EDBI GW Elevation Elevation fe Number Date u 1L � u I L u !L u1L u1L u1L u1L u1L u1L u1L u1L _(ELLu1L ull: et) (feet mslfeet msl Comments MW-5 03131!98 450 40.50 <0.50 <0.50 <0.50 <5.0 no no no no no no no no 61.11 25.11' -36.00 i screened 06110/98 <50 <0.50 <0.50 <0.50 <0.50 <5.0 no no no no na no no no 1 58.41 33.30 no odor!no sheen d interval 09/08/98 450 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 no no 58.41 -33.30 no odor lno sheen 65'-88.5' 12130!98 <50 <0.50 2.5 0.89 5.8 <5.0 no no na na no no no no 56.51 -31.40 no odor lno sheen 03!25!99 450 40.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 no no 54.54 -29.43 no comment 06103!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.$0 53.89 -28.78 no comment 08/30/99 95 1.7 7.4 2.1 15 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 56.04 -30.93 no comment 12!10199 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 40.50 <5.0 <50 <5.0 <0.50 <0.50� 55.99 -30.88 no comment i 0 03/03/00 450 40.50 U:51 < .50 0.92 0< .50 <0.50 <0.50 <0.50 <5.0 <50 6.0 <0.50 <0.50 54.53 -29.42 no odor 1 no sheen ti 06/22/00 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 24 <0.50 <0.56 53.75 -28.64 no odor 1 no sheen 09128/00 <50 <0.50 40.50 <0.50 <0.50 <5.0 no no no no no no na no 56.19 -31.08 no odor lno sheen 12121/00 <50 <0.50 40.50 <0.50 <0.50 <5.0 no no no no no no no no�I55.32 30.21 no odor/no sheen 03128101 78 2.5 114 2.1 11 <5.0 no no no no no na na no 54.44 -29.33 no odor/no sheen 06/27/01 <50 < <0.50 0:68 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 55.89 -30.78 no odor lno sheen 09/06/01 <50 Ei 0.64 0.1 0.70 2.0 <5.0 no na na no no no ria no 57.96 -32.85 no odor 1 no sheen 12/03/01 450 <0.50 X1.1 <0.50 <0.50 <5.0 no no no na no no no no 58.45 -33.34 no odor 1 no sheen 02128!02 <50 <0.50 0.55 <0.50 <0.50 <5.0 no no no no no no no no 57.31 32.20 no odor no sheen 05!20!02 220 11 114 6.4 31 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 57.53 27.10 -30.43 no odorno sheen 08129/02 <50 1 <0.50 <0.50 40.50 0.56 <5.0 no no no na no no no no ` 60.53 -33.43 no odor I no sheen 12/06/02 <50 y 0.73 X1.7 <0.50 1.5 <0.50 no no no no na no no no�I 60.71 -33.61 no odor I no sheen 03105103 450 40.50 40.50 <0.50 <0.50 <5.0 no no no no na no no no 59.87 -32.77 no odor 1 no sheen 06/03/03 2100 <0.50 40.50 <0.50 <0.50 0.57 <0.50 <0.50 <0.50 <5.0 <50 <5.0 4.2 <0.50 58.71 31.61 no odor 1 no sheen 08128/03 <50 <0.50 6,68 <0.50 1.2 <5.0 no na na no no no no no�I60.98 -33.88 no odor 1 no sheen 11125/03 ns ns [ns ns ns ns ns ns ns ns ns ns ns ns 61.81 -34.71 not sampled 03/01/04 6307.4 I16 3.3 29 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 60.50 25.05 -35.45 no odor!no sheen 06!08104 ns ; ns, ns ns ns ns no ns ns ns ns ns ns ns � 61.01 -35.96 not sampled 09/09/04 <51 <0.50 <0.50 <0.50 <0.50 <5.0 no no na no no na no no 62.69 -37.64 no odor 1 no sheen 12108104 ns ns ins ns ns ns ns ns ns ns ns ns ns ns 62.79 37.74 not sampled 03110105 51 0.79 2.6 <0.50 0.85 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 61.59 36.54 no odor lno sheen V 05125/05 ns ns iris ns ns ns ns ns ns ns ns ns ns ns 60.44 -35.39 not sampled 09101/05 <50 -i <0.50 <0.50 <0.50 <0.50 <5.0 no no no no no no no ria 61.24 36.19 no odor/no sheen 12114/05 ns ns; ins ns ns ns ns ns ns ns ns ns ns ns 61.40 36.35 not sampled I 474gm Pa l 16 HORIZON ENMON&INC. ' Project 4.4.48 1 i