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TA*3 <br /> Historical Groundwater Momtonng and Analytical Data y <br /> Ranch Market <br /> 23569 South Santa Fe Road <br /> Riverbank,California <br /> Well NoJ Ethyl- EPA method 8260 B <br /> (A ) agIL) ( (� /L) WIT) to ) (ft) (P3 3Elevation Date Benzene Toluene bewrene Xylenes TPIT-G MTB; TBA RIFE MA <br /> O* TAME 1,2 DCA EDB DTW** WTE <br /> DW-4 10/07/99 — — — — a <10 <10 <10 <10 <10 — — — - <br /> - 12/25/99 <0 3 <03 <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 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 — —04111101 <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 /> 07/03/0 t <0 50 <0 50 <0 50 <0 50 <50 b 11 <5 0 <0 50 <0 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 50 <0 50 <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 50 <0 50 <50 b <0 50 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 <br /> 04/05/02 <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 /> 07/12/02 <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 /> i <br /> i <br /> i <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-tent-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-Dichloroethane <br /> a=analyzed for TPHg and BTEX using EPA methods 8020/8015 EDB=1 2-Dibromoedme <br /> b=analyzed for TPHg,BTEX &Oxygenates using EPA method 8260B <br /> c=Grab water sample collected <br /> d=Well resampled to confirm presence of toluene repotted in first water sample collected after well installation <br /> e=Analyzed for Nitrate/Nitnte using EPA method 300 0 DW-1(08/11100)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=13,600 ug/L <br /> DW-2R(01/08/01)Nitrate as NO3=1 000 ug/L and Nitrate as nitrogen=<400 ug/L <br /> f=Matrix Spike/Matnx 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 /> Ranch Market-RrverbanklTablesl RB-02 30-GW-1 Page 7 of 7 <br />