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0 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 DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (ug1L) (ug/L) (ug1L) (ug]L) (ug/L) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L 1L ) (ug/L) {ug1L} ug1L {feet} {feet msl} (feet msl) Comments MW-1 03131/98 96 40.50 40.50 40.50 <0.50 45.0 na no no no na no 62.27 26.29 -39.98 screened 06/10/98 ns ns as ns ns ns ns ns ns ns ns ns 59.59 -33.30 no comment interval 09/08/98 ns ns ns ns ns ns ns ns ns as ns ns 59.68 -33.39 no comment 75'-90' 12130198 ns ns ns ns ns ns ns ns ns ns ns ns 57.70 -31.41 no comment 0325199 <50 <0.50 <0.50 40.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 45.0 55.71 -29.42 no comment 06/03/99 <50 <0.50 <0.50 <050 <0.50 <0.50 <0.50 <0.50 40.50 <5.0 <50 45.0 40.50 40.50 55.13 -28.84 no comment 08/30/99 <50 40.50 <0,50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 450 <5.0 <0.50 <0.50 57.38 -31.09 no comment 12!10199 <60 <0.50 <0.50 40.50 <0.50 <0.50 40.50 <0.50 <0.50 <5.0 <50 <5.0 40.50 <0.50 57.16 -30.89 no comment 03103" 94 40.50 <0.50 40.50 <0.50 40.50 40,50 40.50 40.50 <5,0 <50 45.0 <0.50 <0.50 56.22 -29.93 no odorinn sheen 06/26/00 130 <0.50 <0.50 40.50 <0.50 <0.50 <0.50 <0.50 <0.50 45.0 <50 45.0 <0.50 <0.50 55.12 -28,83 no odor/no sheen 09128100 240 <0.50 <0.50 <0.50 x0.50 <5.0 no na no no no no no no 57.43 -31.14 no odortno sheen 12/22M 180 <0.50 <0.50 <0.50 <0.50 <5.o no no na no no no no no 56.56 -30.27 no odor/no sheen 03/28/01 180 <0.50 1.5 <0,50 1.2 45.0 na no no no no no na no 55.61 -29.32 no odorino sheen 0627101 350 <0.50 40.50 <0.50 <0.50 <0.50 <0.50 40.50 <0.50 <5.0 450 <5.0 <0.50 <0.50 57.43 -31.14 no odortno sheen 09!06101 520 <0-50 0.68 <0.50 1.2 <5.0 no no no na na na no no 59.22 -32.93 no odorino sheen 12/03101 500 <0.50 <0.50 <0.50 40.50 <5.0 na no no na no na no no QED -33.62 no odor/no sheen MW-I 03/31198 5000 1100 86 71 270 <25.0 no no no no no na 61.45 25.42 -36.03 screened 06/10/98 as ns ns ns ns ns ns ns ns ns as as 58.76 -33.34 no comment interval 09108198s ns ns as ns ns ns ns ns as ns ns 58.82 -33.40 no comment 76'-91.5' 12/30/98 as ns ns ns ns as as as ns ns ns as 56.83 .31.41 no comment 0312 1600 130 1.7 1.1 50 0.62 <0.50 40.50 <0.50 6.1 <50 25 54.90 -29.48 no comment 06103/99 14,000 8300 730 510 2100 40.50 <0.50 <0.50 40.50 <5,0 <50 <5.0 28 0.72 54.27 -28.85 no comment 08/30/99 42.000 8900 5000 1200 5800 0,62 1 2.0 <0.50 40,50 <5.0 <50 45.0 45 40 56.48 -31.06 no comment 12/10/99 12,000 1900 680 330 1200 <5.0 <5.0 <5.0 <5.0 <50 <50 <100 <5.0 <5.o 56.33 -30.91 no comment 03103/00 5100 1800 33 160 62 <62 45.0 <5.0 45.0 <50 <50 <50 <5.0 <5.0 54.91 -29.49 no odor/no sheen 0622100 22,000 5900 530 630 1700 8.5 <5.0 <5.0 <5.0 <50 <500 <200 <5.0 45.0 54,14 -28.72 slight ododnosheen 9928100 16,000 4100 800 260 1500 <50 no no no no no na no no 56.55 -31.13 slightodor/no sheen 1222100 6100 1200 120 200 330 <50 no no no no no na no no 55.73 -30.31 sligh(odor/no sheen MOM 31000 7600 610 1000 3300 <200 na no na no no no no no 54.69 -29.27 ododno sheen 0627101 21000 5800 570 640 2100 <25 <25 <25 <25 <250 <5000 1,900 <25 <25 56.48 -31.06 odor/no sheen M 09)06101 8900 2000 500 210 840 4100 no no no no no no no no 58.67 -33.25 odortno sheen 12104101 28000 6700 1600 910 4000 <250 no no no no no na no no 58.98 -33.56 odortno sheen I I I i I I I' I 474gmroo.rh Projert No.1474r" Page 1 of 7 HORIZON 9MRONI ENTAL INC.