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TABLE 1 GROUNDWATER MONITORING DATA Qmk Stop No 039 2285 Fremont Street,Stockton, California I ethyl- total Depth to TQC GW M Well TPHm TPHg benzene toluene benzene xylene MTBE DIPE ETBE TAME TBA methanol ethanol DCA AA GW Elevation Elevation I Numbe Date (ug/L) (uglL) (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 12/15/99 <100 <50 <0 50 <0 50 27 <0 50 <50 na na na na na na na na 4453 2071 -2382 screened 05/19/00 <100 <50 <0 50 <050 <0 50 <0 50 <50 na na na na na na na na 41 19 -2048 no comment interval 08131/00 <100 60 <0 50 <050 <0 50 <0 50 <50 na na na na na na na na 4435 -2364 no comment 40'-60' 11/02/00 200 <50 <0 50 <0 SO <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 16 <0 50 4639 2191 2448 no odortno sheen 03126/01 na <50 <0 50 31 <0 50 <0 50 <0 50 <0 50 <050 <0 50 <50 na na na na 4443 -2252 no odor/no sheen W21/01 na <50 <0 50 <0 50 <050 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 na na 4569 -2378 no odorino sheen 09117101 na <50 <0 50 17 <050 <0 50 <50 na na na na na na na na 49 14 -27 23 no odndno sheen 1 11129/01 na <50 <0 50 1 8 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 na na 49 11 27 20 no odor/no sheen 02!18102 <100 <50 <0 50 2 4 <0 50 <0 50 <0 50 <050 <0 50 <0 50 <50 <50 <50 16 <0 50 47 14 -2523 no odorino sheen 05102102 <100 <50 <0 50 <050 <050 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 17 <0 50 4757 2164 -2593 no odor/no sheen MW-2 12!15199Ina 610 <0 50 <0 50 <0 50 050 <50 na na na na n,t na 4541-21 76 2365 screened 05/19100300 <0 50 <0 50 <0 50 <0 50 <5 0 na tta na na na na ria na 42 13 -2037 no comment interval 08/31100180 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 45 79 -24 03 no comment 40'-60' 11/02/00280 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 12 <50 <5 0 160 <0 50 4622 2176 -2446 no odorluo sheen 03/26/01280 <0 50 2 0 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 I1 na na na na 44 35 2259 no odor/no sheen 06/21/01 150 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 12 <50 <50 na na 45 59 23 83 no odor/no sheen 09/17/01 na 230 <0 50 0 84 <0 50 <0 50 <50 ria na na na na na na na 48 90 -27 14 no odortno sheen 1[/29/OI na 240 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 12 <50 <50 na na 48 96 -27 20 no odor/no sheen 02/18/02 <100 190 <0 50 1 5 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 90 <50 <50 200 <0 50 47 55 -25 79 no odor/no sheen 05/02/02 <100 200 <0 50 1 1 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 6 2 <50 <5 0 210 <0 50 4739 2151 25 87 no odor/no sheen MW-3 12/15/99 na 360 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na 44 08 2038 -23 70 screened 05/19/00 na 710 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4073 -2035 no comment interval 08131/00 na 480 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 44 38 -2400 no comment 40'-60' 11/02/00 na 310 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 26 <50 <5 0 160 <0 50 44 83 2040 -24 43 no odor/no sheen 03/26/01 na 270 <0 50 2 1 <0 50 54 <0 50 <0 50 <0 50 <0 50 23 na na na na 42 94 -22 54 no odor/no sheen 06/21/01 na 310 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 26 <50 <5 0 na na 44 24 23 84 no odor/no sheen 09/17101 na 210 <0 50 1 5 <0 50 <0 50 <50 <5 0 na na na na na na na 4749 -2709 no odortno sheen 11/29101 na 130 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 15 <50 <50 na na 47 55 -27 15 no odortno sheen 02/18/02 <100 130 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 8 9 <50 <5 0 150 <0 50 46 22 -25 82 no odor/no sheen 05/02/02 <100 150 <0 50 0 52 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 15 <50 <50 130 <0 50 4602 20 13 -2589 no odor/no sheen Notes, TPHmo= total petroleum hydrocarbons as motor oil DCA = 1 2 dtchloroethane < = less than indicated reporting limit TPHg=total petroleum hydrocarbons as gasoline DBA= 1 2 dibromoethane its = not sampled MTBE= methyl Cert-butyl ether GW=groundwater nm = not measured DIPS=dusopropyl ether TOC— top of casing ETRE=ethyl tert butyl ether msl = mean sea level TAME=ten amyl methyl ether TBA= cert butanol 039gn)r00 xis 7039 42 pant, I of 1 HORIZON ENVIRONMENTAL.INC