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TABLE t GROUNDWATER MONITORING DATA Beacon Station No.12474 3446 East Main Street,Stockton,California ethyl- total Depth to TOC GW Well TP1fg bonzene toluene benzene xylenes MTBE DIPS ETRE TAME TSA methanol ethanol EDC EDB GW Elevation Elevatign Number Date (ug/L) (uglL) (uglL) (uglL) (ug/L) (ug/L) (uWL) (u9 j) (uglL) {ug/L) (ug/L) (uglL) (ug/L)(ug/L (feet) (feet msl) (feet msl) Comments VW-1 09/08/98 170000 36000 47000 3300 24000 0.70 -01.50 -01,50 -01.50 <5.0 61 8.8 na na 58.88 nm nm strong odor!no sheen screened 1=0198 190000 34000 49006 3300 24000 0000 no no no no no na no no 57.10 nm odor Ino sheen interval 03125/98 260000 37000 55000 4800 32000 -5.0 <5.0 <5.0 <5.0 -50 -500 <50 no no 55,05 nm no comment W-66' 06103!99 120000 2000D 26000 3500 23000 -50 <s_0 -5.0 <5.0 <50 -500 <50 140 $20 54.19 nm no oomment 08!30/99 130000 25000 46000 3900 25000 -50 <50 <50 <50 -500 <5000 -5010 150 620 58.20 nm no comment 12/10!99 200000 22006 35000 33DO 23000 -100 -100 <100 -100 41000 -10,000 <2000 160 590 56.42 nm no comment 03/03!00 180000 23006 36W0 25W 18000 -100 -100 -100 -100 <1000 <20,000 -1000 150D 5800 $5-63 nm no odorkm sheen 06722/00 190000 23000 391700 3200 22000 :1160 -160 :1010 -100 -11000 00,ODD <t000 130 540 54.16 nm no odarino sheen 09/28100 ns ns ns ns no ns ns ns ns ns ns ns ns ns nm nm 12/22100 190000 29DOO 42000 2900 20000 :2000 no na na no na na no no 55.82 nm odor/no sheen 03128x01 186()00 38000 40000 4900 20000 -500 no na na na no na no no 54.93 nm odor Ino sheen 06/27/01 190000 28000 40000 3900 24000 <200 <2D6 -200 -200 -2000 :20000 14000 290 730 56.43 nm odor Ino sheen 09/08107 230000 36000 43000 3300 20000 :2006 no no no no no no no no 58.66 nm odor Ino sheen 12!04101 200000 32000 41000 3500 23000 :1000 no na na no na na na no 58.81 nm noodorino sheen 03!01102 230000 29006 37000 3700 24000 -2000 no no no no no no no no 57.74 nm stightodor I sheen 05/20!02 2200017 32000 41000 36017 23000 <200 400 -200 <200 <2000 :20000 -2000 <200 <200 57.88 27.51 -30.35 no odor/no sheen 08!30!02 200000 31006 31000 2600 17000 -1000 no no no no no no no no 60,90 -33.39 odor/slight sheen 12168!02 170D00 31DD0 33000 2800 18000 45 na no no na na no na na 61.23 -33.72 odor,/no sheen 00 03/07103 21003$000 46000 3300 21000 -2000 no no na no na no no na 60.21 -32.70 odorinosheen 06/03/03 220000 37000 46D00 3500 22000 <100 -100 <100 -100 0000 <10000 -1000 390 600 5921 -31.70 odor I no sheen 0&29103 230000 35000 33000 3100 21000 :1000 no na na na na no na na 81.30 -33.79 no Morino sheen 11/25/03 ns ns ns ns na ns ns ns ns ns ns ns ns ns 46.38 -18,87 not sampled 474q-00.A, Page 7 of 9 HORIZON ENVMOt7rMZNTAL INC. Project No.1474.44