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TA& Historical Groundwater Monitoring and Analytical Data Ranch Market 23569 South Santa Fe Road Riverbank,California Well.riot A method SM B Etevatton EDB DTW** SPT WTE (T0Q* (R ) ( i_ wlw. -(ft) (R) (ft) DW-4 10/07/99 -- -- -- -- -- a <1 0 <10 <10 <1 0 <10 - - 12/25/99 <0 3 <0 3 <0 3 <0 3 <50 a <5 <20 <5 <5 <5 <5 <5 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 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 11/16100 <0 50 <0 50 <0 50 <0 50 <50 b <0 50 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 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 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 Explanation TOC*=Top of Casing elevation in feet above mean sea level TPH-G=Total petroleum hydrocarbons as gasoline **=Feet below top of casing measured from the northerly side MTBE=Methyl-tert butyl ether pg/L=Micrograms per liter TBA=tert-Butanol =Not sampled/not analyzed/not measured DIPE=DusopropyI Ether DTW=Depth to water ETBE=Ethyl tert butyl Ether SPT=Separate phase thickness TAME=tert-Amyl-Methyl Ether WTE=Water table elevation 12 DCA=1 2-Dichloroethane a=analyzed for TPHg and BTEX using EPA methods 8020/8015 EDB= 1 2-Dibromoethane b=analyzed for TPHg BTEX &Oxygenates using EPA method 8260B c=Grab water sample collected d=Well resampled to confirm presence of toluene reported in first water sample collected after well installation e=Analyzed for NitratefNitnte using EPA method 300 0 DW-I(08111100)Nitrate as NO3=78,800 ug/L and Nitrate as nitrogen=<400 ug/L DW-2(09121100)Nitrate as NO3=60,200 ug/L and Nitrate as nitrogen= 13,600 ug/L DW-2R(01108101)Nitrate as NO3=1,000 ug/L and Nitrate as nitrogen=<400 ug/L File ProjectlRiverbanklTablesl RB-01 2Q-GW-1 Page 5 of 5 4123101