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TA 3 0 <br /> Hlstorlcal Groundwater Monitoring and Analytical Data <br /> Ranch Market <br /> 23569 South Santa Fe Road <br /> Riverbank,California <br /> Well No./ Ethyl- EPA method 8260 B <br /> Elevation Date Benzene Toluene benzene Xylenes TPH-G MTBE TBA DUE ETBA TAME 1,2-DCA EDB DTW** SPT WTE <br /> (TOC)* (lige-) (ug/-) (u ) (I:g�) (Kgn) (ugI-) WIL) (Ag L) (AgIT I ( R) (µg/-) (1i L) (ft) (R) (R) <br /> WA 10/07/99 — — — — a <10 <10 <10 <10 <10 — — — - <br /> - 12125/99 <0 3 <0 3 <0 3 <0 3 <50 a <5 <20 <5 <5 <5 <5 c5 — — <br /> 04/06/00 <0 50 <0 50 <0 50 <0 50 <50 b <0 50 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 — — <br /> 08/16/00 <0 50 <0 50 <0 50 <0 50 <50 b <0 50 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 — — — <br /> 11/16/00 <0 50 <0 50 <0 50 <0 50 <50 b <0 50 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 — — — <br /> 01/03/01 <0 50 <0 50 <0 50 <0 50 <50 b <0 50 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 — — <br /> 04/11/01 <0 50 <0 50 <0 50 <0 50 <50 b <0 50 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 — — — <br /> 07/03/01 <0 50 <0 50 <0 50 <0 50 <50 b 11 <5 0 <0 50 <4 50 <0 50 <0 50 <0 50 — — — <br /> 08/01/01 <0 50 <0 50 <0 50 <0 50 <50 b <0 50 — — — <br /> 10/01/01 <0 50 <0 54 <0 54 <0 50 <50 b <0 50 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 — — <br /> 01/03/02 <0 50 <0 50 <0 54 <0 50 <50 b <3 50 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 — — <br /> E_xplanation <br /> TOC*=Top of Casing elevation in feet above mean sea level TPH-G=Total petroleum hydrocarbons-as-gasoline <br /> **=Feet below top of casing measured from the northerly side MTBE=Methyl-tert-butyl ether <br /> µg/L=Micrograms per liter TBA=tert-Butanol <br /> --=Not sampled/not analyzed/not measured DIPE=Diisopropyl Ether <br /> DTW=Depth to water ETBE=Ethyl-tert-butyl Ether <br /> SPT=Separate-phase thickness TAME=tert-Amyl-Methyl Ether <br /> WTE=Water table elevation 1 2-DCA=1,2-Dtchloroethane <br /> a=analyzed for TPHg and BTEX using EPA methods 8020/8015 EDB=1,2-Dibromoethane <br /> b=analyzed for TPHg,BT-X,&Oxygenates using EPA method 8260B <br /> c=Grab water sample collected <br /> d=Well resampled to confirm presence of toluene reported to first water sample collected after well installation <br /> e=Analyzed for Nitrate/Ntinte using EPA method 300 0 DW-1(08/t 1/00)Nitrate as NO3=78 800 ug/L and Nitrate as nitrogen=<400 ug/L <br /> DW-2(09/21100)Nitrate as NO3=60,200 ug/L and Nitrate as nitrogen=I3,600 ug/L <br /> DW-2R(01108/01)Nitrate as NO3=1,000 ug/L,and Nitrate as nitrogen=<400 ug/L <br /> f=Matrix Spike/Matrix Spike Duplicate Results associated with samples MW-I through MW-4 MW-7,&DW-3 for the analyte TBA were affected by the analyte concentrations already present in the unspiked sample <br /> File ProjectlRiverhmMTablesl RB-02-1Q-GW-1 Page 7 of 7 1!21/02 <br />