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i T ' GROUNDWATERi11QNITORING DATA Beacon Station No.12474 3440 East Main Street,Stockton,California ethyl- total Depth to TOC GW Well TPI4g benzene toluene benzene xylenes MTBE D1PE ETRE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (ug/L) (ug1L) (ug1L) (ug1L} (ug1L) (ug1L) (ug1L) (ug/L) (ug/L) (uglL) jug/L) (ugIL) (ug1L)(u91L (feet) (feet msl} (feet msl) Comments VW4 09108!98 170000 36000 47000 3300 24000 0.70 40.50 40.50 <0.50 <5.0 61 6.8 no no 58.88 nm nm strong odor Inosheen screened 12/30188 190000 34000 49000 3300 24000 41000 na no no no na no no na 57.10 nm odor/nos sen interval 03/25199 260000 37000 55000 4800 32000 <5.0 <5.0 45.0 <5.0 <50 4500 450 no no 55.05 nm no comment 50'-65' 06103199120000 20000 26000 3500 23000 <5.0 <5.0 <5.0 <5.0 <50 <500 <50 140 520 54.19 nm no comment 08/30/99 130000 25000 46000 3900 25000 450 450 <50 <50 <500 <5000 <500 160 620 56.28 nm no comment 12110!99 200000 22000 35000 3300 23000 <100 <100 <100 <100 <1000 <10.000 42000 160 590 56.42 nm no comment 03/03/00 180000 23000 36000 2500 18000 <100 <100 <100 <100 <1000 <20.000 <1000 1500 5800 55.63 nm no odorino sheen 06!22!00 190000 23000 39000 3200 22000 4100 <100 4100 <100 <1000 <10.000 41000 130 540 54.16 nm no odorino sheen 091281D0ns ns as no ns no no as ns ns no ns as ns nm nm 12/22/00 190ODD 29000 42000 2900 20000 '2000 no na no no no no na no 55.82 nm odor Ino sheen 03/28101 180000 36000 40000 4900 2DODO <WO no na no no na no na no 54.93 am odor lno sheen 06/27/01 190000 28000 40000 3900 24000 4200 <200 <200 <200 <2000 <2D000 14000 290 730 56.43 nm odor Ino sheen 09/06/i01 230006 36000 43000 3300 20000 <2000 no no no no na no no na 58.60 am odor 1no sheen 12(04/01 200000 32D00 41000 3500 230DO <l000 no no no no no no no no 58.91 nm no odor/no sheen 03101/132 230000 29000 37000 3700 2400D <2000 no na no no no na no no 57.74 am slight odor/sheen 05120/02 220000 32000 41000 3600 23000 <2DO <200 <2DO <200 <2000 <20D00 <2000 <200 <200 57.66 27.51 .30.35 no odorino sheen 0850102 200000 31000 31000 2600 17000 41000 no no no no no no no no 80.90 -33.39 odorl slight sheen 12/06/02 170000 31000 33000 2800 18000 <25 no no as na no na na na 61.23 -33.72 odor I no sheen 03/07/03 210000 350D0 46006 3300 21000 <2000 no no na no na no no na 60.21 -32.70 odor I no sheen DBM3103 220000 37000 46000 3500 22000 <100 <100 <100 0DO <1000 <10000 <1000 390 600 59.21 -31.70 odor/no sheen 08!29/03 230000 35000 33000 3100 21000 <1000 no no no no no no no no 61.30 -33.79 no odor/no sheen 11125103ns no ns as as ns as ns ns as ns no no ns 46.38 -18.87 not sampled 03/01/04 210000 37000 37000 2700 19000 <50 <50 <50 <50 4500 SCOW <50D 92 <50 60.96 25.22 -35.74 odor/no sheen 06(08104 200000 33000 45000 2700 18000 <100D no no na no no no no no 61.03 -35.81 odor/no sheen VW-2 03/03/00 ns no no ns ns no ns as no no nm no ns no am nm nm dry screened OW2100 ns ns AS ns as ns ns no no as ns as ns ns nm nm dry Interval 09128100 ns ns no ns ns ns ns ns no no ns as as no nm nm dry 37.4T 12122100 as ns n$ as as ns ns no ns no no ns as as nm nm dry 03128!01 ns ns no no ns no no no as no no ns no no nm nm dry 06/27/01 ns ns as no no no no no as ns ns as ns no nm nm dry 09!06101 ns ns no no ns as ns no ns no ns ns ns as nm nm dry 12104101 as ns ns ns ns ns ns as no ns no ns ns ns am nm dry 03101102 ns ns no ns as ns as no as ns as no as no nm am dry 05/20/02 ns ns no no ns as ns ns no no. no no no ns am am dry 03107103 as ns no no as ns ns ns no as as as ns as am nm dry 06103103 ns no no no ns as ns no no as ns ns no ns nm nm dry 08/28103 ns ns as as as ns ns ns no as no as as as nm nm dry 11125103 ns ns no no as ns ns as no no no ns ns no nm nm dry 03101104 no as ns ns ns ns as as no ns ns no ns no nm 25.15 am not sampled D6108104 ns no no as ns ns ns no ns ns ns no ns ns nm nm not sampled i74qmr00''dS Page 8 of 11 HORIZON ENVIRONMENTAL INC. Pmted No.1474.44