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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 TPH9 benzene toluene benzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date u 1L u/L)( u !L (ug/L u 1L (ug/L u IL u 1L a IL (ug/L u 1L u IL u 1L u 1L feet feet msl feet msl Comments MW-7 03131198 <50 <0,50 <0.50 cD.50 <0.50 cS.D no no na na na no no no 61.75 25.66 -36.09 screened 06110/98 <50 <0,50 <0.50 <0,50 c0.50 <5.0 no na no na no na na na 59.04 -33.38 no odor!no sheen interval 09/08198 <50 <0,50 <0.50 <0.50 <0.50 <0.50 <0.50 <0,50 <0.50 <5.0 <50 <5.0 na no 59.19 -33.53 no odor I no sheen 56'-76' 12130/98 <50 <0.50 <0 50 <0.50 <0.50 <5.0 na no na no no na na no 57.18 -31.52 no odor 1 no sheen 03125/99 <50 <0.50 <0.50 <0.50 c0,50 <0.50 c0.50 <0.50 <D.50 <5.0 <50 <5.0 no no 55.07 -29.41 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 5.6 <0.50 54.61 -28.95 no comment 08130199 <50 1 <0.50 <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 comment 12/10199 <50 <0.50 <0.50 <0.50 <0.50 0.50 c0.50 <0.50 <0 50 <5.0 <50 <5 0 4.7 <0,50 56.68 -31.02 no comment 03103100 <50 <0.50 <0.50 <0.50 <0.50 0.62 <0.50 <0.50 < 06/26100 <50 <0.50 <0.50 <0.50 <0.50 < 0.50 <5.0 <50 0 5.0 <0.50 55.61 -29.95 no odorino sheen 0.50 <0.50 <0.50 <0.50 <5,0 --5095❑ 9.4 4.0 <D.50 54.62 -28.96 no otlorino sheen 09/28100 <50 <0.50 <0,50 <0.50 <0.50 <5.0 no na na na na na nona 56.93 -31.27 no otlorino sheen 10!20100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm 24.73 nm wellhead re-surveyed 12122!00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm no odor/no 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 06127/01 <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 odorino sheen 09106/01 <50 <0.50 <0.50 <0.50 <0.50 <5.0 no no na na na na na no 58.03 -33.30 no ododno sheen 12/03/01 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na no na no na no no no 58.41 -33.68 no odorino sheen 02/28/02 <50 <0.50 <0.50 <0.50 <0.50 <5 0 na na na na no no na na 57.13 -32.40 no odor/no sheen 05120/02 51 <0.50 1.9 <0.50 <0.So 0.92 <0.50 <0.50 <0.50 <5.0 <50 <5 0 15 <0,50 57.55 28.94 -30.61 no odor/no sheen 0809102 <50 <0.50 <0.50 <0.50 <0.50 <5.0 no no no no na no na na 60.63 -33.69 no odorino sheen 12!06102 <50 <0.50 <D.50 <0.50 <0.50 0.96 no na na na na no na na 60.74 -33.80 no odorino sheen MW-8 03/31198 100 <0.50 <0.50 <D.50 c0.50 <5.6 na na na no no na na na 61.51 25.68 -35.83 reported as MW-3A screened 06/10/98 80 0.9 <0.50 <0,50 <0.50 <5.0 no no no no na na na na 58.86 -33.18 reported as MW-3A interval 09/08/98 79 0.57 <0.50 <0.50 <0.50 <0.50 <0.50 <0,50 <0.50 <5.0 <60 <5.0 no no 58.97 -33.29 slight odor I no sheen 56'-76' 12/30/98 51 2.4 0.69 <0.50 <0.50 c5.0 na na na no na no na na 57.13 -31.45 slight odor I no sheen 03/25/99 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0,50 <0,50 <5.0 <50 <50 na na 55.09 -29.41 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 <0S0 54,42- -28.74 no comment 08130/99 <50 0.67 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5,0 <50 <5.0 <0.50 <0.50 56.60 -30.92 no comment 12110/99 330 <0.50 <0,50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 5.1 <50 <10 0.51 <0.50 56.57 -30.89 no comment 03103/00 <50 <0.60 <0 50 <0.50 <0.50 <0.50 <0,50 <0.50 <0.50 <5,0 <50 <5.0 <0.50 <0.50 55.28 -29.60 no odorino sheen 06122/00 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0,50 <0.50 <0.50 <5.0 <50 12 0.63 <0.50 54.37- -28.69 no odorino sheen 09128/00 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na no na na no na na no 56.75 -31.07 no odor/no sheen 12121/00 <50 c0.50 <0.50 <0.50 <0.50 <5.0 no na no na no na no na 55.92- -30.24 no odorino sheen 03/28/01 <50 <0.50 1.4 <0.50 1.1 <5.0 no na na na na na no na 54.98- -29.30 no odor/no sheen 06/27101 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0,50 <0.50 7.6 <50 <5.0 <0.50 <0.50 56.57 -30,89 no odor/no sheen 09/06101 <50 <0,50 <0.50 <0.50 <0.50 <5.0 no no na na na no na no 58.46 -32.78 no odorino sheen 12/03/01 130 <0.50 <0.50 <0.50 <0.50 <5,0 na no na na no na na na 59.02 -33.34 no odorino sheen 02/28/02 85 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na na no 57.85 -32.17 no ododno sheen 05120/02 140 <0.50 <0.50 <0.50 <0.50 <0.50 c0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 58.11 27.64 -30,47 no ododno sheen 08129/02 c50 <0.50 <0.50 <0.50 <Q50 <5.0 na na na no na na no na 61.14 -33.50 no odor/no sheen 12/06/02 160 8.9 13 3.4 21 <0.50 na no na na no na no na 61.33 -33.69 ododno sheen 474gmr00_s1s Pra}ed No.1474.44 Page 4 of 8 HORIZON ENVIRONMENTAL INC.