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i i • � r 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 ETBE TAME TBA meth eth DCA DBA Pb DTW elev elev Number Date (uglL) (ug/L) (ug1L) (uglL) (ug1L) (uglL) (uglL) (uglL (uglL) (uglL) (uglL) (uglL) (uglL) (uglL) (uglL) (uglL) (feet) (feet msl) (feet msl) Comments MW 3 12/15/99 na 360 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na 4408 2038 2370 screens 05119/00 na 710 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na na 4073 -4073 no comment interval 08131/00 na 480 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na na 4438 -44 38 n0 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 <50 160 <0 50 na 44 83 2040 24 43 no odor/no sheen 03126/01 na 270 <0 50 2 1 <0 50 54 <0 50 <0 50 <0 50 <0 50 23 na na na na na 4294 22 54 no odor/no sheen 06/21101 na 310 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 59 26 <50 <5 0 na na na 4424 23 84 no odorino sheen 09117101 na 210 <0 50 1 5 <0 50 <0 50 <5 0 <50 na na na na na na na na 4749 2709 no odorino sheen 11/29/01 na 130 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 15 <50 <5 0 na na na 4755 -2715 no odor/no 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 <50 150 <0 50 6 8 4622 2582 no odorino sheen 05/02/02 <100 150 <0 50 052 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 15 <50 <50 130 <0 50 na 46 02 20 13 -2589 no odorino sheen 08/22/02 <100 210 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 19 na na 210 na na 4998 -29 85 no odorino sheen 11/12/02 na 150 <0 50 <0 50 <0 50 1 1 <0 50 <0 50 <0 50 <0 50 12 na na 100 na <0 0050 5082 -3069 no odor/no sheen 01/31/03 na 140 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 8 5 na na 100 na na 4917 -2904 no odorino sheen 05/02/03 na 130 <0 50 0 57 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 na na 120 na na 4773 -2760 no odorino sheen 08/07/03 na 160 <0 50 <0 50 1 2 <0 50 <0 50 <0 50 <0 50 <0 350 <8 0 na na 100 na na 50 21 -3008 no odor/no sheen 10/28/03 na 110 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 98 na na 5165 -31 52 no odor/no sheen 02/03/04 na 90 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 na <5 0 79 na na 5008 -2995 no odorino sheen 06/15/04 na 66 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 na na 86 <0 50 na 50 94 -3081 no odor/no sheen &g TPHm=total petroleum hydrocarbons as motor oil MTBE=methyl tett-butyl ether DCA=1 2-dlchlaroelhane <=less than indicated reporting limit TPHg=total petroleum hydrocarbons as gasoline RIPE=dlnsopropyl ether DBA=1 2-dibromoethane ns=not sampled 8=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 TSA=tert-butanol GW=groundwater X=total xylenes meth=methanol TOC=top of casing eth=ethanol elev=elevation msl=mean sea level 039gmr04 As 703945 Page 2 of 2 HORIZON ENVIRONMENTAL ENC