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• Table 1 - Summary of N*hemical Analytical Data <br /> Unocal Service Station No 6981 <br /> 4707 Pacific Avenue <br /> Stockton, California <br /> Wellhead Influent Sample Results Effluent Sample Results <br /> Date TPHg TPHg Benzene Benzene Toluene Ethylbenzene Xylenes MtBE TPHg TPHg Benzene Benzene Toluene Ethylbenzene Xylenes <br /> (mg/m3) (PPmv) (mglm}) (Ppm') {mglms} {mglm3) (mglm3) (mglm5) (mglm') (PPmv) (mg/m3) (PPmv) (mg1m3) {mglm3) {mglm3) <br /> mg1m3 = milligrams per cubic meter <br /> ppmv = parts per million by volume <br /> TPHg = Total Petroleum Hydrocarbons as gasoline <br /> MtBE = methyl tert-butyl ether <br /> NA = not analyzed for this constituent <br /> 1 System shut down on 10/26/97 due to the failure of the flame detector The flame detector was replaced on 1215197, and <br /> the system operated approximatley 3 hours Influent and effluent samples were collected to confirm detector operation <br /> and destruction effectency, then the system was shut down pending rectept of analytical data Dilution valve control <br /> motor replaced and system restarted on 12/21/97 <br /> 2 Sample of effluent inadvertently not collected on 3122199 <br /> 5 Sample also analyzed for methyl tert-butyl ether(<1 00 mglm3) <br /> 6 Sample also analyzed for methyl tert-butyl ether(<0 50 mglm3) <br /> 140124 04 <br /> Stockton,to 6981 <br />