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TA& i <br /> Historical Groundwater Monitoring and Analytical Data <br /> Ranch Market <br /> 23569 South Santa Fe Road <br /> Riverbank California <br /> Well NoJ Ethyl- EPA 8020 EPA method 8260 B <br /> Elmdon Date Benzene Toluene benzene Xyltaiea '[?H-G MTBE MTBE I TBA I RIPE ETBA TAME t,2-QCA EDB DTW� SPT �(fo <br /> (PDC)• ) ( ) ( ) ) (11 ) { ) ) ) ( ! ) ) ) ( ) ft [ft) <br /> W-3 10/07/99 - - -- a <10 <10 <10 <10 <10 —10736 12/25/99 <0 3 <0 3 <0 3 <0 3 <50 a <5 <20 <5 <5 <5 <5 <5 -- — <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 so <0 50 <0 50 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 /> W-4 10/07M -- - - — a <10 <10 <10 <10 <10 — <br /> 12/25199 <0 3 <0 t <0 3 <0 3 <50 a <5 <20 <5 <5 <5 <5 <5 <br /> 04/06100 <0 50 <0 50 <0 50 <0 50 <50 b -- <0 50 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 --08/16/00 <0 50 <0 50 <050 <0 50 <50 b - <0 50 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 — - <br /> I II I&M 4 50 <0 50 <0 50 <0 50 <50 b — <0 50 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 - -- <br /> Explanation <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 ten-butyl ether <br /> µg/L=Micrograms per Itter TBA=tert-Butanol <br /> =Not sampied/not analyzed/not measured RIPE=Di-isopropyl Ether <br /> DTW=Depth to water EfBE=Ethyl-ten butyl Ether <br /> SPT=Separate-phase thickness TAME=tert-Amylmethyl Ether <br /> WTE=Water table elevation 12 DCA=1 2-Dichloroethane <br /> a=analyzed for TPHg BTEX EPA methods 8020/8015 EDB=12 Dibromoethane <br /> b=analyzed for TPHg BTEX &Oxygenates using EPA method 8260B <br /> c=No purge water sample balled from well <br /> d=depth below grade,discrete water sample collected hydropunch attached to dnve rod sample bailed through rods <br /> e=depth below grade,discrete water sample collected using Maxi-Simulprobc attached to drive rod <br /> f=depth discrete grab sample prior to well installation <br /> Ist=Well resam led to confirm presence of 13TEX TPHg and M[BE reporting in first water sample collected after well installation <br /> File PrglectlRiverbank%Tablesl RB-00.4Q GW-I xis Page 3 of 3 12115/2000 <br />