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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 xyienes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (ugh.) (ug1L) (u& (uglL) (u } (ug/L) (ug/L} (u !L) (ug/L) (ug/L) (ug/L) jug/L) (ug/L)(ugh- (feet) (feet msi) (feet mal) Comments MW-3 03/31/98 72 40.50 <0.50 40.50 <0.50 45.0 no no no no no na no no 61.53 25.54 -35.99 screened 06/10/98 no ns ns ns no no ns no ns no no ns na na 58.85 -33.31 noMmment Interval 09106198 ns ns ns ns no ns ns ns ns ns ns ns to na 58,94 -33.40 no comment 76'-90' 12610/98 ns no AS no ns no ns no no no ns ns no no 56.96 -31.42 no comment 0325199 73 40.50 40.50 40.50 40.50 <0,50 <0.5Q 40.50 <0.50 45.0 <50 <5.0 no no 5501 -29.47 no comment 06103199 65 40.50 <0.50 <0.50 <0.50 <0.50 <0.50 <650 <0.50 <5.0 <50 <5,0 88 <0.50 54.39 -28.85 no comment 08!30/99 <50 <0.50 40.50 <0.50 40.50 <0.50 <0.50 40.50 40.50 <50 450 <5,0 BO <0,60 5661 -31.07 no comment 12/70199 51 <0.50 40.50 <0 So 4050 40.50 40.50 <0.50 40.50 <5.0 <50 45,0 60 <0.50 56.47 -30.93 no comment 03/03100 450 <0.50 <0.50 <0.50 <Q.SO 5.0 <0.50 <0.50 <0.50 <5.0 <50 <5,0 32 <0.50 55.39 -29.85 no odor/no sheen 061Y2100 450 <0.50 40,50 40.50 40.50 40.50 40.50 40.50 40.50 <5'0 450 21 t8 <0.50 54,32 -28.78 no odarhw sheen 0926100 <50 40.50 40.50 <0.50 <0.50 45.0 na no no no no no no no 56.71 -31.17 no odorino sheen 12121/00 450 <0.50 40.50 <0.50 40.50 <5.0 no na no no no na no no 55.77 -30.23 no odorinosheen 0328101 450 <0.50 0.55 <0.50 40.50 <5.0 na na no no no na no no 54.115 -29.31 no odor/no sheen 05127107 4,50 40.50 40,50 4o.5o 40.50 40.50 40..50 40.50 40.50 <5-0 450 45,0 11 <0.50 56.45 -30.91 no odor/no sheen 09/06101 <50 <0.50 <0,50 <0.50 0.63 <5.0 no na no no no no no no 58.49 -32.95 no odorino sheen 12103101 450 40.50 0.54 40.50 40.50 45.0 na no na no no na no no 56.92 33.38 no odorino sheen 03MI102 <50 <0.50 0.63 <0.50 40,50 <5.0 na na no no no no no no 57.72 -32.18 no odortno sheen 0520/02 <50 <0.50 0.54 <0.50 <0,50 <0.50 <0.50 <0,50 <0.50 <5,0 450 <5.0 1.9 <0.50 58.04 2752 -30.52 no odor/no sheen 08/29102 <50 40.50 40.50 40.50 <0,50 <5.0 no no no na no no no no 6192 -34.40 no odor/no sheen 12106162 230 19 24 5.2 33 <0.50 na no no no no no no no 61.23 -33.71 odorino sheen 43107163 160 <0.50 <0.50 40.50 <0,50 45.0 no no no no no no no no 6040 -32.88 odor/nosheen 0616303 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 40.50 <0.50 <5D <50 <5.0 <0.50 40.50 59.17 -31.65 odorino sheen 0826163 ns no ns no ns ns ns ns ns ns ns n$ no no nm nm not sampled 11025103 no ns as no ns AS ns ns ns ns no no ns no 62.31 -34.79 not sampled 03101104 110 1.3 2.9 40.50 3.6 40,50 40.50 <0.50 40.50 50 <50 <5.0 40.50 <0.50 61,00 -33.48 no odorhlo sheen MW-4 03/31/98 ns ns no no no ns ns ns ns ns ns no ns ns nm 25.15 nm not located screened 06/111198 ns ns ns no ns no ns ns no ns no ns ns ns nm nm not located Interval 09108198 ns ns no ns ns ns ns no ns ns ns ns ns ns nm nm not located 55.-W 112!30/96 no ns ns no no ns ns ns ns no ns ns ns ns nm nm paved over 0325+99 no ns ns ns ns no ns ns n$ ns ns ns n$ ns nm nm paved over 08030199 ns ns ns ns no ns ns ns ns no no ns ns ns nm nm paved over 12110199 ns ns ns no no ns ns ns ns ns no ns ns ns nm nm paved over 03/03100 ns ns ns ns ns no ns ns ns ns ns no ns ns nm nm paved over 0622100 ns ns ns no ns ns ns ns ns ns ns n$ ns ns nm nm paved over 0928= 450 <0.50 <0.50 <0.50 4050 <5.0 no no na na no na no no 50.16 -31.01 no odorino sheen 12!21100 450 <0.50 40.50 <0.50 40.50 45.0 no no na na no no no no 55.28 30.13 no ododno sheen 0312MI <50 1.1 5.8 0.93 4,5 <5.0 no no no no no no no no 54.41 •29.26 no odorino sheen M27M 450 40.50 40,50 40-50 40,50 <0.50 40.50 40.50 <Q.50 45.0 450 <5.0 40.50 40.50 55.90 -30.75 no odorino sheen 09/06101 450 <D.50 0.76 40.50 1.6 45.0 no na no no no no na na 57.97 -32.82 no odorino sheen 12103161 <50 40.50 057 <0.50 40.50 <5.0 no no na no no no no no 58.57 -33.42 no odorino sheen 03MI102 <50 <0,50 40.50 <0.50 40.50 <5.0 na no na no no no no no 57.29 -32.14 noododnosheen 0520102 <50 40.50 <0.50 <0.50 <0.50 <0.50 4050 <0.50 <0.50 <5.0 <50 45.0 <0,50 <0.50 57.55 27.13 3042 no odor/no sheen 08291072 450 <0.50 <0.50 40.50 0.51 <5.0 no na na no no no na na 60,53 -33.40 no odortno sheen 12106102 450 40-50 0-54 40.50 40.50 40.50 na na na no na no no no 60.75 -33.62 no odorino sheen 03105/03 1804 <0,50 0.68 <0.50 40.50 <5.0 no no no no no na no no 59.82 -32.69 no ododno sheen 06103103 2300 <0,50 <0-50 40.50 40.50 <0.50 40.50 4050 <0,50 45.0 450 45,0 45 40.50 58,93 -31,80 no odorMo sheen 0829/03 <50 <0,50 <0.50 40.50 40.50 <5.0 na na na no no no no no 61.00 -33.67 no odor/no sheen 1125103 no ns ns ns ns no ns ns no no no ns ns no 61.8o -34.67 not sampled 03101/04 1200 100 200 20 110 <4.50 40.50 40.50 <0.50 45.0 450 45.0 0.57 <0.50 60.50 -33.37 no odor/no sheen 4744m'00.n5 Page 2 of 9 ProjW Na.1474." HORIZON ENVIRONMENTAL