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TA*3 <br /> Historical Groundwater Monitoring and Analytical Data <br /> Ranch Market <br /> 23569 South Santa Fe Road <br /> Riverbank,California <br /> Well NoJ Ethyl- EPA method 8260 B <br /> Elevation Date Benzene Toluene benzene Xylenes TPH-G MTBE TBA DIPS ETBA TAME 1,2-DCA EDB DTW** SPT WTE <br /> (COC}* (AgIL) (1r8�) (Ag/L) (µms) (u ) (u�) (u 1, (ltgn) (kgs 7 (ugh) (lrgR) (u ) (fl) (ft} (ft) <br /> W4 10/07/99 — — — -- a <10 <10 <10 <10 <10 — — <br /> 12125l99 <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 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 4 50 4 50 <0 50 <0 50 <50 b <0 50 <50 <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 <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 /> 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-tert-butyl ether <br /> pg/L=Mrerograms per liter TBA=tent Butanol <br /> —=Not sampled/not analyzed/not measured DIPE=Dusopropyl 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 12 DCA=1,2-Dichloroethane <br /> a=analyzed for TPHg and BTEX using EPA methods 8020/8015 EDB=1 2 Dibromoethane <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 reported in first water sample collected after well installation <br /> e=Analyzed for Nitrate/Nitnte using EPA method 300 0 DW-1(08111/00)Nitrate as NO3=78,800 ug/L and Nitrate as nitrogen=<400 ug/L <br /> DW-2(09/21/00)Nitrate as NO3=60,200 ug/L and Nitrate as nitrogen=13 600 ug/L <br /> DW-2R(01108/01)Nitrate as NO3=1000 ug/L and Nitrate as nitrogen=<400 ug/L <br /> File PrglectUbverbanklTablesl RB-01-4Q-GW-1 Page 7 of 7 12/14/01 <br />