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. Table 1 - Summary of VT*hemical Analytical Data i <br /> Unocal Service Station No 6981 <br /> 4707 Pacific Avenue <br /> Stockton, Califorrua <br /> Wellhead Influent Sample Results Effluent Sample Results <br /> Date TPHg3 TPHg Benzene Benzene Toluene Ethylbenzene Xylenes TPHg TPHg Benzene Benzene Toluene Ethylbenzene Xylenes <br /> (mg/m) (ppmv) (mg/m3) (ppmv) (mg/m) (mg/m� (mg/m) (mglm3) (ppmv) (mg/m) (ppmv) (mg1m) (mglm) (mg/m� <br /> 05-24-99 1,7004 448 91 26 56 <50 10 90 24 0 58 0 17 0 31 0 075 0 58 <br /> 05-26-99 45 35 12 9 <0 0500 <00160 <00500 <0 0500 <0 0500 64 8 18 4 <0 0500 <0 0160 0 141 <0 0500 0 283 <br /> 05-26-99 System shut down due to low influent concentrations <br /> 06-19-99 8306 219 32 9 0 57 <0 25 <0 25 65 17 030 009 <0 050 <0 050 0 10 <br /> 06-21-99 877 23 2 3 0 7 <0 25 <0 25 0 44 100 26 027 008 <0 25 <0 25 <0 25 <br /> Explanation. <br /> mg/n3 = milligrams per cubic meter <br /> ppmv = parts per million by volume <br /> TPHg = Total Petroleum Hydrocarbons as gasoline <br /> t detector The flame detector was replaced on 1215197, and <br /> System shut down on i0126l97 due to the failure of the flame P <br /> the system operated approximatley 3 hours Influent and effluent samples were collected to confirm detector operation <br /> and destruction effeciency,then the system was shut down pending reciept 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 /> 3 Sample bag for effluent sample deflated during transport to laboratory <br /> 4 Sample also analyzed for methyl tert-butyl ether(220 mg1m3) <br /> 5 Sample also analyzed for methyl tert-butyl ether 057 mg1m) <br /> 6 Sample also analyzed for methyl tert-butyl ether(200 mg/m 3) <br /> 7 Sample also analyzed for methyl tert-butyl ether(270 mg/m3) <br /> t40124 04 <br /> Stockton to 6981 xls <br />