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TABLE 3 Historical Groundwater Monitoring and Analytical Data Ranch Market 23569 South Santa Fe Road Riverbank California wen Nei Ethyl- EPA method 8260 B Elevation Date Benzene Toluene benzene Xylenes TPH-G MTBE TBA I DIPE I ETBA I TAME 1,2-DCA EDB DTW** SPT WTE (TOC)* (1191L) ( ) (IL ) (11 R-) (u } (✓< ) (tL IL) (R �) (u n-) (le /L) (R ) (t+ �) (ft) (ft) (ft) W4 10/07/99 — -- a <10 <10 <10 <10 <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 — 11/16/00 <0 50 <0 50 <0 50 <0 50 <50 b <0 50 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 — 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 — Ezolanauon TOC*=Top of Casing elevation in feet above meats sea level TPH G=Total petroleum hydrocarbons-as-gasoline **=Feet below top of casing measured from the northerly side MTBE=Methyl-tert-butyl ether gg/L=Micrograms per liter TB A=cert Butanol --=Not sampledthot arWyzed/not measured DIPE=Diisopropyl Ether DTW=Depth to water ETBE=Ethyl-tert-butyl Ether SPT=Separate-phase thickness TAME=tert-Amyl-Methyl Ether WTE=Water table elevation l 2-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 to first water sample collected after well installation e=Analyzed for Nitrate/Nitrite using EPA method 300 0 DW-1(08111/00)Nitrate as NO3=78 800 ug/L and Nitrate as nitrogen=<400 ug/L DW-2(09/21/00)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 Nitrale as nitrogen=<400 ug/L File Pr41ectlRiverbank\Tablesl RB-01-2Q GW 1 Page 5 of 5 5/10101