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I • TLE I • r GROUNDWATER MONITORING DATA Beacon Station No.474 3440 East Main Street,Stockton,California I 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 (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (feet) (feet msl) (feet msl) Comments MW-1 03/31/98 96 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na rta na 62.27 26.29 39.98 serftwA 06/10/98 ns as as ns ns as ns ns Its as ns ns 59.59 -33.30 no comment interval 09/08/98 ns as as ns ns ns as ns ns ns as ns 59.68 -33.39 no comment 75'-90' 12/30/98 ns as as as as as ns ns ns ns as Its 57.70 -31.41 no comment 03/25/99 <50 <0.50 <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 06/03/99 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0,50 <0.50 55.13 -28.84 no comment 08!30/99 <50 <0.50 <0.50 <050 <0.50 <0-50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 <0.50 <0.50 57.38 -31.09 no comment 12/10/99 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5 0 <0.50 <0.50 57-18 -30.89 no comment 03/03/00 94 <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 56.22 -29.93 no odor/no sheen 06/26/00 130 <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 55,12 -28.83 no odor/no sheen KW.t2. 03131/98 5,000 1,100 86.0 71.0 270 <25.0 na na na na na na 61.45 25.42 -36.03 semi aed; 06/10/98 as as as as ns as ns ns as as ns ns 58.76 -33.34 no comment interval 09/08/98 as as as as its as as as ns as ns ns 58.82 -33.40 no comment a 76=9l.S' 12/30/98 ns as ns ns Its as as as ns ns as as 56.83 -31.41 no comment 03/25/99 1,600 130 1.7 l.l 50 0.62 <0.50 <0 50 <0.50 6.1' <50 25 54.90 -29.48 no comment 06/03/99 14,000 8,300 730 510 2,100 <0.50 <0-50 <0.50 <0.50 <5.0 <50 <5.0 28 0.72 54.27 -28.85 no comment 08/30/99 42,000 8,900 5,000 1,200 5,800 0.62 2.0 <0.50 <0.50 <5.0 <50 <5.0 45 40 5648 31.06 no comment 12/10/99 12,000 1,900 680 330 1,200 <5.0 <5-0 <5.0 <5.0 <50 <50 <100 <5.0 <5.0 56,33 -30.91 no comment 03/03/00 5,100 1,800 33 160 62 <5.0 <5.0 <5.0 <5.0 <50 <50 <50 <5-0 <5.0 54.91 -29.49 no odor/no sheen 06122/00 22,000 5,900 530 630 1,700 8.5 <5A <5.0 <5.0 <50 <500 <200 <5.0 <5.0 54.14 -28,72 slight odorino sheen KW-3 03/31/98 72 <0.50 <0.50 <0.50 <0.50 <5.0 na na na na na na 61.53 25.54 -35.99 Sereened 06/10/98 Its ns ns ns as as as ns Its as ns ns 58 85 -33.31 no comment .: . -interval 09/08/98 as as as ns ns as ns ns ns ns ns ns 58.94 -33.40 no comment 75'-90' 12/30/98 ns as as ns ns as ns ns as ns ns ns 5696 -31.42 no comment 03/25/99 73 <0.50 <0.50 <0.50 <0.50 <0.50 <050 <0.50 <0.50 <5.0 <50 <5.0 5501 -29.47 no comment 06/03/99 65 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 6.0 <50 <5.1) R8 <0-50 54.39 -28.85 no comment 08/30/99 <50 <0,50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 80 <0.50 56.61 -31.07 nu comment 12/10/99 51 <0.50 <0.50 <0,50 <0.50 <Q50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 60 <050 56.47 -3093 no comment 03/03/00 <50 <0.50 <0.50 <0.50 <0.50 5.0 <0-50 <0,50 <0.50 <5.0 <50 <5.0 32 <0.50 55.39 29.85 no odorino sheen 06122!00 <50 <0.50 <0.50 <0.50 <030 <0-50 <0.50 <0.50 <0,50 <5-0 <50 21 18 <n 50 54.32 -28 78 no odorino sheen rK. W-4 03/31/98 ns ns ns ns ns as as ias ns ns ns ns nna 25.15 mn not located serccned. 06/10/98 ns as as ns ns as ns ars ns ns ns Its nm 31111 not located interval 09/08/98 las ns ns ns ns ns ns ns ns ns ns ns non nat not located 6$'-86.' 12/30/98 ns Its as ns ns ns ns ns ns ns ns ns nm nm paver!over 03/25/99 ars Its as as ns ns ns ns ns as its ns ns as nm atm paved over 08/30/99 as ns ns ns ns as ns ns ns ns its ns ns ns 111111 nna paved over 12/10/99 ns Its as ns ns ns ns ns ns ns ns its ns ns run mal. paved over 03/03/00 as ns as as ns ns Its ns Its ns ns ns as ns nna nna paved over 06/22/00 ns ns as ns ns ns ns ns ns ns ns ns its ns nm nm paved over 474gmr00As ` 1474.43 Page 1 of 4 HORIZON ENVIRONMENTAL INC. I ,