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i A TABLE 1 GROUNDWATER MONITORING DATA Beacon Station No. 12474 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) (u 91L) (ug/L) (ug1L) (ug/L) (ug1L) (ug/L) (ug1L) (ug/L) ug1L (feet) (feet msi) (feet ms]) Comments MW-3 [12)'=98 31!98 72 40.50 40.50 <0.50 40.50 <5.0 na na na na na na 61.53 25.54 -35.99 screened10/98 ns as ns ns ns ns ns as ns ns ns ns 58,85 -33.31 no comment interval08/98 ns ns as ns ns ns ns ns as as ns ns 58.94 -33.40 no comment 75'-90' as ns ns as ns ns ns ns ns ns ns as 56.96 -31,42 no comment 5M 73 <0.50 <0.50 <0.50 <0.50 <0.50 <0,50 <0.50 40.50 <50 <50 <5.05501 2947 no comment 03199 65 <0.50 <0.50 <0.50 <0.50 40,50 40.50 <0.50 40.50 <5.0 450 <5.0 88 <0.50 54.39 -28,85 no comment OB/30r99 <50 <0.50 <050 <0.50 <0.50 <0.50 <0.50 <0,50 40,50 <5.0 <50 <5.0 80 <0.50 56.61 -31.07 no comment 12/10/99 51 40.50 <0.50 <0.50 40.50 40.50 <0.50 <0.50 <0.50 45.0 450 <5.0 60 <0.50 56.47 -30.93 no comment 03103/00 <50 40.50 <0.50 40.50 <0.50 5.0 <0,50 <0.50 <0.50 <5.0 <50 <5.0 32 <0.50 55.39 -29.85 no odoflno sheen 06122/00 <50 <0.50 <0.50 <0.50 40.50 40.50 <0.50 <0.50 40.50 <5.0 450 21 18 40.50 54.32 -28,78 no odortno sheen 09!28100 450 <0.50 <0.50 <0,50 <0.50 <5.0 na na na na na na na na 56.71 -31.17 no odor/no sheen 12121100 <50 <0.50 <0.50 <0.50 <0.50 <5.0 as na na na na na na na 55,77 -30.23 no odor/no sheen 03!28101 450 <0.50 0.55 <0.50 <0.50 <5.0 nana na na no na na na 54.85 -29.31 no odor/no sheen 06127104 <50 40.50 <0,50 <0.50 40.50 40.50 40.50 c0,50 40,50 <5.0 <50 45.0 11 <0.50 56.45 30.91 no odarino sheen 09!06101 <50 <0.50 <0.50 <0.50 0.63 <5.0 na na na na na na na na 58.49 -32.95 no odortho sheen 12/03/09 450 <0.50 0.54 <0.50 <0.50 45.0 na na na na na na na na 58.92 -33,38 no odor/no sheen MW4 03/31/98 as as ns ns as as ns ns ns ns ns ns nm 25.15 nm not tocaled screened 06/10/98 ns ns ns ns ns ns ns ns ns ns ns as nm nm not located interval 09/08/98 ns ns ns as ns ns ns ns AS as ns ns nm nm not located 65'-66' 1mar98 ns as ns ns ns as ns ns ns ns as as nm nm paved over 03/25/99 ns ns ns as ns ns ns ns as ns ns ns ns ns nm nm paved over 08130199 ns ns ns as ns ns ns ns as ns ns ns ns ns nm nm paved over 12/10/99 as as ns ns ns as ns ns ns n$ as ns ns as nm nm paved over 03/03/00 ns ns ns ns ns ns ns ns ns ns ns as as ns nm nm paved over 06/22100 ns ns as ns ns ns ns ns ns as ns ns ns ns nm nm paved over 09/26100 450 <0.50 <050 <0.50 40.50 45.0 na na na na na na na na 56.16 •31.01 no odor/no sheen 12/21/00 <50 <0.50 <0.50 <0.50 40.50 45.0 na na na na na na na na 55.28 -30.13 no odor/no sheen 03/28/01 <50 1.1 5.8 0.93 4.5 <5.0 na na na na na na na na 54.41 -29.26 no odor/no sheen 06127101 <50 40.50 40.50 40.50 <0.50 <0.50 <0.50 <0.50 <D.50 <5.0 <50 <5.0 40.50 <0.50 55.90 -30.75 no Morino sheen h 09106101 <50 40.50 0.76 <0.50 1.6 <5.0 na na na na na na na na 57.97 -32.82 no odorino sheen 12103101 <50 40.50 0.57 40.50 <0.50 <5.0 na na na na na na na na 58.57 -33.42 no odorino sheen 474grtv00.As PrWo No,1474,M Page 2 of 7 HORIZON ENVIRONMENTAL INC.