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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 i TPFIg benzene toluene benzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number date (ug/L) (ug1Lj (ug/L) (uglL) (ug/L) (ug/L) (ug/L) (ug/L) (ugILJ {uglL} {ugILJ (ug1L) (ug/L) ug/L {feet) {feet msl) (feet mslJ Comments NNV•1 03/31A9e 96 .00.50 cD,50 .00.50 c0.50 <5.0 na na na na na na 62.27 26.29 -39.98 screened 06110198 as as as as as as ns as ns ns as ns 59.59 -33.30 no comment Interval 09/08198 as ns ns ns ns ns ns as ns as as as 59.68 33,39 no Comment T5`-89' 12!30198 as ns as ns ns n$ as ns ns ns ns ns 57,70 -31.41 no comment 0325199 <50 .00.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0-50 <5.0 <50 <5.0 55.71 -29.42 no comment OW3199 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 .00.50 <0.50 <5.0 <50 <5.0 <0.50 .00.50 55.13 -28,84 no comment 08/d0199 <50 <0.50 .00.50 <0.50 <0.50 .00.50 <0.50 <0.50 c0.50 <5.0 <50 c5.0 .00.50 <0.50 57.38 -31.09 no Comment 12/10199 <50 .00,50 <0.50 <0.50 .00.50 <0.50 <0.50 <0,50 <0.50 <5.0 <50 c5.0 .00.50 .00.50 57.18 30,89 no comment 03!03100 94 .00.50 <0.50 .00.50 x0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5,0 <050 <0,50 58.22 -29.93 no odorino sheen 06/16100 130 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.D .00.50 .00.50 55.12 20.83 no odorfio sheen 09!28100 240 .04,50 <0.50 .00,50 .00.50 <5,0 na na na na na na na na 57.43 -31.14 no odortno sheen 1222100 180 <0.50 <0.50 <0,50 <0.50 <5.0 na na na na na na na na 56.56 -30.27 no odarino sheen 0312&01 180 <0.50 1.5 <0.50 1.2 <5.0 na na na na na na nana 55.61 -29.32 no odorino sheen 06/27Ai 350 <0,50 .00.50 <0.50 <0.50 <0.50 <0.50 c0,50 <0,50 <5.0 <50 <5.0 50.50 <030 57.43 -31.14 no odor/no sheen 09106101 520 <0.50 0.68 <0.50 1.2 <5.0 na na na na na na na na 59.22 -32.93 no odorino sheen MW-2 03!31198 5000F8:3D0730 6 71 270 <25.0 na na na na na na 61.45 25,42 -36.03 sereened 06110/98 nss as ns as ns as ns ns ns ns 58.76 33.34 no Comment Interval 0910$198 nss as ns ns ns as ns n$ as as 58,82 76'-91.5' 12MOM ass ns ns ns ns ns ns ns ns as -33.40 no comment �.� -31.41 no comment 0325199 16007 1.1 50 0.62 <0.50 <0.50 <0.50 6.1 <50 25 54.90 29.48 no comment 0&103199 14.000 510 2100 .00.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 28 0.72 54.27 -28.85 no comment 011GO 9 42,00000 1200 5800 0.62 2.0 .00.50 .00.50 <5.0 <50 <5.0 45 40 58.48 -31.06 no comment 121fOV99 12.000 1900 680 330 1200 <5.0 <5.0 <5.0 <5.0 <50 <50 <100 <5.0 <5.0 56.33 -30.91 no comment 03/03100 5190 1800 33 160 62 <5.0 <5.0 <5.0 <5.0 <50 <50 <50 <5.0 <5.0 54.91 •29,49 no odorhw sheen 0822100 22.000 5900 530 630 1700 8.5 <5.0 <5.0 <5.0 c50 <500 <200 <5.0 <5.0 54.14 -28.72 slight odorfio sheen 09128100 18'000 4100 am 260 1500 <50 na na na na na na na as 56.55 -31,13 slight odormo sheen tWWO 6100 1200 120 200 330 <50 na na na na na na na no 55.73 -30.31 slightodorinosheen 0326101 31000 7600 610 1000 3300 <200 na na na na na na na na 54.89 29.27 odor/no sheen 0827101 21000 5800 570 640 2100 <25 <25 <25 <25 <250 <5000 1,900 <25 <25 56.48 -31.06 odWnosheen 09!06101 8900 2000 506 210 840 <100 na na na na na na na na 58,67 -33.25 odor/no sheen MW-3 03/31/98 72 <0.50 <0.50 <050 <0.50 <5.0 na na na na na na fi1.53 25.54 35.99 screened 08!10198 ns ns n9 ns as as as as n$ ns ns as 61.115 63 Interval 09/08/98 as as n$ as ns ns ns as ns as as n5 FIS -33.31 no comment 6.94 -33-40 no cet 91Y TS'- 12/30/98 ns ns as as ns ns ns as ns ns ns as 56.96 -31,42 n000nununeat 0325198 73 .00.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 55.01 D6103A99 65 .00.50 <0.50 <0.50 <0.50 c0.50 <0.50 <0.50 <0,50 <5.0 <50 <5.0 68 <0.50 54.39 -28.47 no comment oerjam 28.85 no continent <50 .00.50 .00.50 .00.50 .00.50 .00.50 .00.50 c0.50 .00.50 e5.0 <50 <5.0 80 .00.50 56.67 -31.07 no comment 12/110199 51 <0.50 <0.50 <0,50 <0.50 <0.50 <0.50 c0.56 <0.50 <5.0 <50 <5.0 60 <0.50 5647 03/03100 <50 <0.50 <0.50 <0.50 .00.50 5.0 <0.50 <0.50 <0.50 <5.0 <50 <5.0 32 .00,50 55.39 -39.93 no comment she 06122/00 <50 < -29.85 no odor/no sheen 0.50 .00.50 .00.50 c0.50 .00.50 .00.50 <0.� .00,50 <5,0 <50 21 18 .00.50 54.32 -28.78 no odorino sheen 09128/00 <56 <0•50 <0.50 <0-50 <0.50 <5.0 na na na na na na na na 56.71 -31.47 no odor/no sheen 1221100 <50 .00,50 .00.50 .00.50 W.50 <5.0 na na na na na na na na 55.77 -30.23 no odor/no sheen � 032&01 <50 <0.50 0.55 <0.50 <0.50 <5.0 na na na na na na na na 54.85 -29.31 no odor/no sheen 00127/01 <50 <0.50 <0.50 -40.50 <0.50 <0.50 .00.50 .00.50 .00.50 <5.0 <50 <5.0 11 <0.50 56.45 30.91 no odor/no sheen 09/D6/01 <50 .00.50 .00.50 c0.50 0.63 <5.0 na na na na na na na na 58.49 32.95 no odorfio sheen -j 4Tlgnvofl.#s PmOd Na.1474.44 Page 1 of 6 HORIZON ENVIRONKE"AL ENC.