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s TA Ii GROUND WATER MONITORING DATA Exxon Servlco Station 7-3708 2705 Country Club Boulevard Stockton, Calrfomia Ground Reference Depth to Water Ethyl- Total. TPPH as 0.-}genate Monitoring Elevation Ground Elevation Benzene Toluene benzene Xylenes gasoline MTBE Compounds Well Date (ft) Water(ft) (ft) (ug/L) (�ig[L) (µg/1.,) (µg/L) ()-Lg/L) (41-) (4g/1.) Comments MW-8 05/31/94 -040 1082 -1122 <0 5 <0 5 <0 5 <0 5 <50 NA NA No LPH or sheen 08/30/94a 1270 -13 10 <0 5 <0 5 <0 5 <0 5 <50 NA N/\ No LPH or sheen 11/22/942 13 38 -1378 <0 5 <0 5 <0 5 <0 5 <50 NA NA No LPH or sheen 01/12/952 1215 -1255 <0 5 <0 5 <0 5 <0 5 <50 NA NA No LPH or sheen 03/31/95 NM NC NS NS NS NS N5 N5 NS NM 04/05/95 776 -816 <0 5 <0 5 <0 5 <0 5 <50 NA NA No LPH or sheen 07/14/95 NM NC <0 5 <0 5 <0 5 <0 5 <50 NA NA NM 07/17/95 967 -1007 NS 1\7S NS NS NS NS NS No LPH or sheen 10/05/95 1160 -1200 <0 5 <0 5 <0 5 <0 5 <50 NA NA No LPH or sheen 04/02/96 680 -720 <0 5 <0 5 <0 5 <0 5 <50 NA NA No LPH or sheen 07/31/96 935 -975 <0 5 <0 5 <0 5 <0 5 <50 NA NA No LPH or sheen 10/23/96 1029 -1069 <0 5 <0 5 <0 5 <0 5 <50 <5 0 NA No LPH or sheen 02/07/97 585 -625 <0 5 <0 5 <0 5 <0 5 <50 NA NA No LPH or sheen 05/30/97 753 -793 <0 5 <0 5 <0 5 <0 5 <50 5 9 NA No LPH or sheen 08/20/97 9 98 -1038 <0 5 <0 5 <0 5 <0 5 <50 10 NA No LPH or sheen 11/24/97 965 -1005 <0 5 <0 5 <0 5 <0 5 <50 NA 3 Ul' No LPH or sheen 03/30/98 578 -6 18 <0 5 <0 5 <0 5 <0 5 <50 NA I(' No LPH or sheen ' Total volatile hydrocarbons Rcfcrenoe 6L%-ation Elevation relatavn to mean sea 1L%el ° Result is an estimated value because it exceeds the linear range Depth to ground water =Measured from notch'mark on north edge cf w ell casmi ` Atypical chromatogram with umdentilied peak(s)withinthe range of gasolme hydrocarbons Chlorinated NEV"L 1-acrog—per liter hydrocarbons are suspected A ground water sample collected from monitoring well MW-6 on April 17,1942 TPPH=Total purageble petroleum hydrocarbons or total petalcum h)drocarbom(TPI�by EPA Method 8015 Modific i contained ehlorobcnzene and 1,2-did-Aorobenzene MTBE=MethyI terizary butyl ether by EPA Method 8020 except as noted e Ox)gLnate compounds=sample analyzed for ethanol t butanol MTBE di isopropyl ether ethyl tertiary butyl ether ind t anti 1 Atypical chromatogram Analysis of this ing chlorinated ri EPA Method 624 on April 17 de,c(past LPA reoeffic e, xi methyl ether by EPA Method 8260 All analytes were reported below the laboratory detection hrntt,except as noted halduig time},was positive four the following chlorinated hydrocarbons vmylchlonde,cis 1 2-dichiaroeihcne, se petroleum hydrocarbonspha d e trichloroethane and tetrachloroethane positiveLPIi=Liqui These peaks resulted m a fuel hydrocarbon result. R'S-Not aid pl a d. Atypical chromatogram Four unknown peaks were observed causing a positive fuel hydrocarbon result. \A-'got analysed Chlorinated hydrocarbons are suspected Vhf-*lel mcasiirid r Atypical chromatogram. An unknown peak was observed between MTBE and benzene ',C-Not calculated Chlorinated hydrocarbons are suspected, g Atypical chromatogram. Analyses of this sample by EPA Method 624 on April 17,1992(past EPA recommended holdmg tune) waa positive for the following Wonnatad hydrocarbons chlorobenum and]2-duhlerobenaene h MTBE concentmtiom by EPA Method 9260 C;3ae,8 of 8) 93-809 N�—S