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• s • 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 RIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date u !L (ug/L u IL jug/L u 1L u IL u IL (ug/L u 1Lu 1L u !L u R u 1L u 1L feet feet msI feet ms]) Comments MW-7 03!31!98 450 40.50 40.50 <0.50 <0.50 <5.0 no na no no no no na no 61.75 25.66 -36.09 screened 06!10198 <50 <0,50 <0.50 40.50 <0.50 <5.0 na na na no no na na no 59,04 -33.38 no odor!no sheen Interval 09/08/98 450 <0.50 <0.50 40.50 40.50 <0.50 <0.50 <0.50 <0.50 45,0 <50 <5.0 na no 59.19 -33.53 no odor/no sheen 56'-76' 12!30198 <50 40.50 <0.50 40.50 <0.50 <5.0 no no na no no no no no 57.18 -31.52 no odor!no sheen 03125!99 450 <0550 40.50 <0,50 40.50 40.50 40.50 <0.50 <0.50 <5.0 <50 45.0 no na 55.07 -29.41 no comment 06/03/99 <50 <0.5o <0.50 <0.50 <0.50 <0.50 40.50 40.50 <0.50 45.0 <50 <5.0 5.6 40.50 54.61 -28.95 n0 comment 08/30/99 450 <0.50 c0.50 <0.50 <0.50 <0.50 <0,50 <0 so <0.50 <5.0 450 <5.0 2.1 <0.50 56.85 -31.19 no comment 12110!99 <50 <0.50 <0.50 <0.50 <0.50 0.50 <0.50 <0.50 <0.5o <5.0 <50 45.0 4.7 40.50 56.68 31.02 no comment 03103100 450 <0.50 <0,50 <0.50 <0.50 0.62 <0.50 <0.50 <0.50 <5.0 <50 <5.0 50 40.50 55.61 -29.95 no odorino sheen 06126!00 <50 <0.50 <0.50 <0.50 40.50 <0.50 <0,50 <0.50 <0.50 <5.0 <50 9.4 4.0 40.50 54.62 -28.96 no odorino sheen 09128100 <50 <0.50 <0.50 40.50 <0.50 45.0 no na no na no na na na 56.93 -31.27 no odorino sheen 10/20/00 n5 ns n5 ns ns ns ns ns ns ns ns ns ns ns nm 24.73 nm wellhead re-surveyed 12/22/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm no odorino sheen 03/28/01 73 6.2 17 1.5 7.5 <5.0 ns ns ns ns ns ns ns ns 54.73 -30.00 no odorino sheen 06/27/01 <50 <0.50 1.0 <0,50 <0.50 0.87 <0.5G <0,50 40.50 <S.0 <50 <5.0 6.0 <0.50 55.99 -31.26 no odorino sheen 09706/01 <50 40.50 <0.50 40.50 <050 <5.0 no na no no no no na no 58.03 -33.30 no odorino sheen 12!03101 <50 <0.50 40.50 <0.50 <0.50 45.0 no no no no na na na na 58.41 -33.68 no odorino sheen 02128!02 <50 <0.50 <0.50 <0.50 <0.50 <5.0 no no no no na no no no 57.13 32.40 no odorino sheen 05120102 51 40.50 1.9 40.50 40.50 0.92 40.50 40.50 40.50 45,0 <50 45.0 15 40.50 57.55 26.94 -30.61 no odorino sheen 08129/02 <50 <0.50 <0.50 <0.50 <0,50 <5.0 no na na na no na na no 60.63 -33.69 no odorino sheen 12106!02 <50 <0.50 <0.So <0.50 <0.50 0.96 na no no no no na no no 60.74 -33.80 no odorino sheen MW-8 03131!98 100 40.50 40.50 40.50 40.50 45.0 no no no no no na no no 61.51 25.68 -35.83 reported as MW-3A screened 06/10198 80 0.9 <0.50 <0.50 <0.50 <5.0 na na no no no na na no58.86 -33.18 reported as MW-3A Interval 09108/98 79 0.57 <0.50 40.50 <0,50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 na no 58.97 -33.29 slight odor/no sheen 56'-76' 12I3of98 51 2.4 0.69 <0.50 <0.50 <5.0 no no no na na no na no 57.13 -31.45 slight odor 1 no sheen 03!25199 <50 <0.50 40.50 <0.50 <0.50 <0.50 40.50 40,50 40.50 45.0 450 <5.0 na no 55.09 -29.41 no comment 06!03!99 450 40.50 40.50 40,50 40.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 40.50 <0.50 54.42 -28.74 no comment 08/30/99 <50 0.67 40.50 <0.50 <0.50 <0.50 <0.50 40.50 <0.50 <5.0 <50 <5,0 <0,50 <0,50 56.60 30,92 no comment 12/10/99 330 <0.50 40.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 5.1 <50 410 0.51 40.50 56.57 -30.89 no comment 03103!00 <50 40.50 <0.50 -0.50 <0.50 <0-50 40.50 40.50 40.50 45.0 450 45.0 40.50 40.50 55.28 -29.60 no odorino sheen 06122100 <50 <0.50 40.50 <0,50 <0.50 40.50 40.50 <0.50 <0.5o <.0 <50 12 9.63 <0.50 54.37 -28.69 no odorino sheen 09/28/00 <50 <0,50 <0.50 <0.50 <0.50 <5,0 no no no no no no no no 56.75 -31.07 no odorino sheen 12!21100 <50 <0.50 <0.50 <0.50 <0.50 45,0 no no no no no no na no 55.92 -30.24 no odorino sheen 03!28101 <50 40.50 1,q 40.50 1A <5,0 no na no na no no na na 54.98 -29.30 no odorino sheen 06/27/01 <50 <0.50 <0.50 <0.50 <0,50 <0.50 <0.50 <0.50 <0.5o 7.6 <50 <5,0 <0.50 <0.50 56.57 -30.89 no odorino sheen 09106!01 <50 <0.50 40.50 <0.50 <0,50 <5.0 na no na no no na no na 58.46 -32.78 no odorino sheen h 12103101 130 40.50 <0.50 40.50 <0.50 45.0 na no na no na na no na 59.02 -33.34 no odorino sheen 02128102 85 <0.50 <0.50 <0.50 <0.50 <5.0 no no no na no no na na 57,85 -32.17 no odorino sheen 05!20102 140 40.50 <0.50 <o,5o <0.50 <0.50 <0.50 <0.50 <0,5o <5.0 <50 <5.0 <0.50 40.50 58.11 27.64 -30,47 no odorino sheen 08129102 <50 <0.50 40.50 <0.50 40.50 <5.0 no no na no na na no no 61.14 -33.50 no odorino sheen 12106102 160 8.9 13 3.4 21 <o.50 na na na na no no no no 61.33 -33.69 odorino sheen 474grnroO ids PMacr No.1474.44 Page 4 of 8 HORIZON ENVIRONKENTAL INC.