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iTable 1 - Summary of Vohemical 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 TPH TPHg Benzene Benzene Toluene Ethylbenzene Xylenes MTBE TPHg TPHg Benzene Benzene Toluene Ethyibenzene Xylenes <br /> (mg/m� (Ppmv) (mg/m3) (Ppmv) (mg/m3) (mg/m3) (mg/m3) (mg/m3) (mg/m3) (Ppmv) (mglm3) (PPmv) (mg/m3) (mg/m3) (mg/m3) <br /> 05-24-99 1,700 448 91 26 5 6 <50 10 NA 90 24 058 0 17 031 0 075 058 <br /> 05-26-99 453 12 <00500 <00160 <00500 <0 0500 <0 0500 220 648 184 <00500 <00160 0 141 <0 0500 0 283 <br /> 05-26-99 System shut down due to low influent concentrations <br /> 06-19-99 830 219 32 9 057 <0 25 <0 25 357 65 17 030 009 <0 050 <0 050 010 <br /> 06-21-99 87 23 23 07 <0 25 <0 25 044 270 100 26 027 008 <0 25 <0 25 <0 25 <br /> 07-27-99 92 24 64 1 8 <0 25 <0 25 <0 25 260 25 7 021 006 <0 050 <0 050 <0 050 <br /> 0"2-99 System shut down due to low influent concentrations <br /> 08-22-99 2,400 633 61 18 1 9 <05 096 360 264 7 0 18 005 <0 050 <0 050 <0 050 <br /> 08-24-99 56 15 1 1 03 <0 25 <0 25 <0 25 350 53 14 <0 050 001 <0 050 <0 050 <0 050 <br /> 09-16-99 2,000 527 41 12 45 <0 10 <0 10 <0 50 41 11 024 007 <0 010 <0 010 010 <br /> 09-20-99 97 26 19 05 <0 050 <0 050 <0 050 300 36 9 <0 010 <0 003 <0 010 <0010 <0 010 <br /> Explanation- <br /> mg/m3 = milligrams per cubic meter <br /> ppmv W parts per million by volume <br /> TPHg = Total Petroleum Hydrocarbons as gasoline <br /> MtBE = methyI tert-butyl ether <br /> NA = not analyzed for this constituent <br /> I 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 approxtmatley 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(<0 250 mg1m) <br /> Stockton,to 6981 140124 04 <br />