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TABLE 1 GROUNDWATER MONITORING DATA Quik Stop No 39 2285 Fremont Street,Stockton, California total TOC GW Well TPHm TPHg B T E X MTBE DIPE ETRE TAME TBA meth eth DCA DBA Pb DTW elev elev Numbe Date (uglL) (ug/L) (uglL) (ug/L) (uglL) (ug1L) (ug1L)(uglL (uglL) (ug/L) (uglL) (ug1L) (ug/L) (uglL) (uglL) (uglL) (feet) (feet msl) (feet msl) Comments MW-3 12/15/99 no 360 <0 50 <0 50 <0 50 <0 50 <50 na no no no no no na 44 08 2038 -2370 screens 05/19100 na 710 <0 50 <0 50 <0 50 <0 50 <50 no no na no no no no no no 4073 -4073 no comment Interval 08/31/00 no 480 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no no no no 4438 -4438 no comment 40'60' 11/02/00 no 310 <0 50 <0 50 40 50 <0 50 <0 50 <0 50 <0 50 <0 50 26 <50 <50 160 <0 50 no 4483 2040 -2443 no odorino sheen 03/26/01 na 270 <0 50 21 <0 50 54 <0 50 <0 50 <0 50 <0 50 23 no na no no no 42 94 22 54 no odorino sheen 06/21101 no 310 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 26 <50 <5 0 no no no 44 24 -2384 no odor/no sheen 09/17/01 no 210 <0 50 15 <0 50 <0 50 <50 <5 0 no na no no no no no na 4749 -2709 no odorino sheen 11/29/01 no 130 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 5D 15 <50 <5 0 no no no 4755 -2715 no odorino 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 68 46 22 2582 no odor/no sheen 05/02/02 <100 150 <0 50 052 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 15 <50 <5 0 130 <0 50 no 4602 20 13 -2589 no odor/no sheen 08/22/02 <100 210 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 19 no na 210 no no 49 98 -2985 no odor/no sheen 11/12/02 no 150 <0 50 <0 50 <0 50 1 1 <0 50 <0 50 <0 50 <0 50 12 no no 100 no <0 0050 5082 -3069 no odorino sheen 01/31/03 no 140 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 85 no no 100 no no 4917 -29 04 no odorino sheen 05/02/03 no 130 <0 50 057 <0 50 <0 50 <0 50 <D 50 <0 50 <0 50 <5 0 no na 120 no na 4773 -2760 no odor/no sheen 08/07/03 no 160 <0 50 <0 50 12 <0 50 <0 50 <0 50 <0 50 <0 35D <8 0 no no 100 no no 5021 30 08 no odor/no sheen 10/28/03 no 110 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 98 no no 51 65 -31 52 no odor/no sheen 02/03/04 no 90 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 no <5 0 79 no no 5008 -2995 no odor/no sheen 06/15!04 no 66 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 no no 86 <0 50 no 50 94 -3081 no odor/no sheen 08/20/04 no 86 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 no no 85 <0 50 no 5248 -3235 no odor/no sheen i Notes TPHm W total petroleum hydrocarbons as motor oil MTBE=methyl tert-butyl ether DCA=1 2-dtchloroethane <=less than indicated reporting limit TPHg=total petroleum hydrocarbons as gasoline DIPE=dasopropyl ether DBA=1,2-dibromoelhane ns=not sampled B=benzene ETRE=ethyl tert-butyl ether total Pb=total lead nm=not measured T=toluene TAME=tert-amyl methyl ether '=soluble lead DTW=depth to groundwater E=ethylbenzene TBA=tert-butanol GW=groundwater X=total xylenes meth=methanol TOC=top of casing eth=ethanol elev=elevation msl=mean sea level I 039gmrD4 As 703945 Page 2 of 2 HORIZON ENVIRONMENTAL INC