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�1MMMMMMMIWM <br /> i <br /> GROUND WATER MONITORING DATA <br /> Exxon Service Station 7-3708 <br /> 2705 Country Club Boulevard <br /> Stockton California <br /> Reference Depth to Ground Total TPPH as Oxygenate <br /> Monitoring Elevation Ground Water Benzene Toluene Ethyl-benzene Xylenes gasoline MTBE Compounds <br /> Well Date (ft) Water{ft) Elevation(ft) (49/L) (µg/-) (n/L) (wg(L) (µPQ-) (m/L) (mfl-) <br /> _ <Q 5 <0 5 <0 5 <0 5 <50 <2 5 NA <br /> Trip Blank 08/31/99 --- -" _- <br /> 11/23/99 --- --- --- <1 0 <1 Q <1 0 <1 0 <50 <1 0 NA <br /> 02/10/00 --- --- --- <br /> <5 0 <5 0 <5 0 <5 0 NA <5 0 ND <br /> a=Total volatile hydrocarbons <br /> b=Result is an estimated value because it exceeds the linear ranee <br /> e=Atypical chromatogram with unidentified peak(s)within the range of gasoline by droearbons Chlnnnated h�drocarbons are suspected <br /> A ground water sample collected from monitoring well MW-6 on April 17 1992 contained thlombenzene and 1,2-dichlorobenzene <br /> d=Atypical chromatogram Analysis of this sample by EPA Method 624 on April 17, 1992(past IPA recommended holding time),was positive for the <br /> following chlonnatedhydrocarbons llnylehlonde,cis-1,2 d1Lh10P0etbe11e trichloroethane and tetrachloroethane These peaks resulted in apositive <br /> tuel hydrocarbon result <br /> e=A tvpiial chromatogram Four unknown peaks were observed causing a posinN a fuel h�drotaii)on result Chlonnated h%drOidibons are suspected <br /> t =A typical chromatogram An unknown peak was ohsern ed between MTBE and benzine CWorm ated hN drocarbons are LC ted <br /> g=Atypical chromatogram Analysis of this sample by FPA Method 624 on April 17 1992(past FPA recommended holdim time) was positive torthe <br /> following chlorinated hydrocarbons chlombenzene and 1,2-dichlorobenzene <br /> h=MTBE concentrations bN FPA Method 9260 <br /> I=Unidentified hydrocarbon in the C6-C 12 range <br /> j=1,2-Dehloroethane <br /> Reterenie elevation =Elevation relative to mean sea level <br /> Depth to ground water =Measured from notch mark on north edge of well casing <br /> mg�L=Micrograms per liter <br /> TPPH=Total purageble petroleum hydrocarbons or total petroleum livdrocarbons(TPH)by HA Method 8015 Modified <br /> MTBE=Methyl tertiary butyl ether by EPA Method 9020 Modified,except as noted <br /> Oxygenate compounds—sample analyzed for ethanol,t-butanol,MTBE,di-isopropyl ether,ethyl ternary hutvl ether,and t amyl methyl ether by <br /> EPA Method 8260 All analytes were reported below the laboratory detection limit except as noted <br /> LPH=Liquid-phase petroleum hydrocarbons <br /> I <br /> NS=Not sampled- <br /> NA <br /> ampledNA=Not analyzed. <br /> AIM=Not measured <br /> NC—Not calculated <br /> (Yaee 16 of 15) 93 4tt9 xis <br />