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i I <br /> Table 1 - Summary of V10hemical 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 TPH TPI-Ig Benzene Benzene Toluene Ethylbenzene Xylenes <br /> (mg1m� (ppmv) (mg/m3) (PPmv) (mg/m3) (mg/m3) (mg1m) (mg1m3) (mg1rn� (ppmv) (mg/m3 (PPmv) (mg1m) (mg1m) (mg/m) <br /> 05-24-99 1,700 448 91 26 56 <50 10 NA 90 24 058 017 031 0 075 058 <br /> 05-26-99 453 12 <00500 <00160 <00500 <0 0500 <0 0500 220 648 184 <0 0500 <0 0160 0 141 <0 0500 0 283 <br /> 05-26-99 System shut down due to low influent concentrations <br /> 06-19-99 830 219 32 9 057 <0 25 <0 25 357 65 17 030 009 <0 050 <0 050 0 10 <br /> 06-21-99 87 23 2 3 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 /> 08-02-99 System shut down due to low influent concentrations <br /> 08-22-99 2,400 633 61 18 1 9 <0 5 096 360 264 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 it 024 007 <0 010 <0 010 010 <br /> 09-20-99 97 26 1 9 05 <0 050 <0 050 <0 050 300 36 9 <0010 <0003 <0 010 <0 010 <0 010 <br /> 10-26-99 3,520 928 502 144 <5 00 <5 00 <5 00 170 590 156 121 35 182 6 11 394 <br /> 10-29-99 329 87 <0 500 <0 144 <0 500 <0 500 3 87 296 647 17 1 0 191 0 055 0 181 0 199 174 <br /> 11-16-99 1,190 314 300 86 457 <2 00 105 420 416 110 0 473 0 14 0 153 0 230 205 <br /> 11-19-99 148 39 197 057 0 260 0 450 285 195 502 132 0 135 0 039 0 373 0 774 686 <br /> 12-13-99 430 113 12 34 <20 <20 <20 47 55 145 053 0 15 032 017 25 <br /> 12-16-99 30 8 072 021 <0 10 <0 10 0 17 16 <106 <26 <0 10 <0 029 <0 10 <0 10 0 19 <br /> mg/m3 = milligrams per cubic meter <br /> ppmv = parts per million by volume <br /> TPHg = Total Petroleum Hydrocarbons as gasoline <br /> MtBE = methyl.tent-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 approzimatley 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 /> s Sample also analyzed for methyl tert-butyl ether(<100 mg1m) <br /> 6 Sample also analyzed for methyl tert-butyl ether(<0 50 mg/m3) <br /> Stockton,to 6981 140124 04 <br />