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a 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 ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date u IL u /L u /L u 11. u IL (upill-) u !L u IL u 11. u IL a 11. u 11. u IL u IL feet feet msl feet msl Comments MW-3 03/31/98 72 <0.50 <0,50 <0.50 <0.50 <5.0 no na no na na na no no 61.53 25.54 -35.99 screened 06/10198 ns ns ns as ns ns ns ns ns ns ns ns na na 58,85 -33.31 no comment interval 09108!98 ns as ns ns n$ ns ns ns ns ns as ns no no 58.94 33.40 no comment 75'-90' 12130!98 ns ns ns as ns ns ns ns as as ns ns no no 56.96 -31,42 no comment 03!25!99 73 <0.50 <0.50 <0.50 <0.50 <0,50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 no no 55.01 -29.47 no comment 06103/99 65 <0.50 <0,50 <0,50 <0.50 <0.50 <0 50 <0.50 <0.50 <5.0 <50 <5.0 88 <0.50 54,39 28.85 no comment 08130199 <50 <0.50 <0,50 <0.50 <0.50 <Q.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 80 <0.50 56.61 -31.07 no comment 12110199 51 <0 50 <0.50 <0.50 <0.50 <0.50 <0.50 <Q.50 <0.50 <5.0 <50 <5,0 60 <0,50 $6.47 -30.93 no comment 03103!00 <50 <0,50 <0.50 <0.50 <0.50 5.0 <0.50 <0,50 <0.50 <5.0 <50 <5D 32 <0.50 55.39 -29.85 no odor/no sheen 06!22!00 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 21 18 <0.50 54.32 •28,78 no odor/no sheen 09128/00 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na na no no no no na 56.71 -31.17 no odorino sheen 12/21100 <50 <0.50 <0.50 <0.50 <0.50 <5.0 na na no no no na na na 55.77 -30.23 no odorino sheen 03/28/01 <50 <0.50 0.55 <0.50 <0.50 <5.0 na na no no na no na na 54.85 -29.31 no odor/no sheen 06/27101 <50 <0.50 <0,50 <0.50 <0,50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 11 <0.50 56.45 -30.91 no odor/no sheen 09/06/01 <50 <0,50 <0.50 <0.50 0.63 <5.0 no no na na no no na no 58.49 -32.95 no odor/no sheen 12103/01 <50 <0.50 0.54 <0.50 <0.50 <5.0 no no na no no no no no 58.92 -33.38 no odor/no sheen 03/01/02 <50 <0,50 0.63 <0.50 <0.50 <5,0 na na no na na no na na 57.72 -32.18 no odorino sheen 05/20/02 <50 <0.50 0,54 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 1.9 <J.50 58.04 27.52 -30.52 no odorino sheen 08129/02 <50 <0,50 <D.50 <0.50 <0,50 <5.0 na no no no no no no no 61.92 -34.40 no odor/no sheen 12/06/02 230 19 24 5.2 33 <0.50 no no na no no no no no61.23 -33.71 odor/no sheen FW--4 03/31/98ns ns ns as ns as ns ns ns ns ns ns as ns nm 25.15 nm not located screened 06/10198 as as as ns ns ns as ns ns as as as as ns nm nm not located Interval 09108198 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not located 65'-86' 12/30/98 ns ns as ns ns ns as ns ns ns ns ns ns ns nm am paved over 03/25/99 as ns as as ns ns ns as as as ns as ns ns nm nm paved over 08!30199 ns ns n$ ns ns as as ns ns ns ns ns ns asnm nm paved over 12110199 as as as ns as ns ns ns ns ns ns ns ns ns nm nm paved over 03103ns ns ns as ns ns ns as as AS ns ns ns ns !00 nm nm paved over 06122!00 ns ns as ns as ns as ns ns ns ns ns ns ns nm nm paved over 09128100 <50 c0.50 <0.50 <0.50 <0,50 <5,0 na na no no no na na no 56.16 -31.01 no odor/no sheet) 12!21100 <50 <0.50 <0.50 <0.50 <0.50 <5,0 na na no na na no na no 55.28 03128/01 <50 1.1 5.$ 0.93 4,5 <5.0 no no na na na no no na 54,41 30'13 no odorino sheen 29.26 no odorino sheen 101 <50 <0.50 <0.50 <0.50 <0.50 <0,50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 55.90 -30.75 no odorino sheen 09106101 <50 <0.50 076 <0.50 1.6 <5.0 na no na no na no no na 57.97 -32.82 no odor/no sheen 12103101 <50 <0.50 0.57 <0.50 <0.50 <5,0 na no no no no no no na 58.57 -33.42 no odor/no sheen 03101102 <50 <0.50 <0.50 <0.50 <0.50 <5.0 no no no no no na no no 57.29 -32.14 no odorino sheen 05/20/02 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0,50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 57.55 27.13 -30.42 no odorino sheen 08129102 <50 <0.50 <0.50 <0.50 0.51 <5.0 no no no no no no no no 60.53 -33.40 no odorino sheen 12/06102 <50 <0.50 0.54 <0.50 <0.50 <0.50 no no no no no no no na 60.75 33.62 no odorino sheen I M 474gmN0.s1s Project No.1474.44 Page 2 of 8 HORIZON ENVIRONMENTAL INC.