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Table 1 - Summary of V90hemical Analytical Data . Unocal Service Station No 6981 s 4707 Pacific Avenue Stockton,California Wellhead Influent Sample Results Effluent Sample Results Date TPHg TPHg Benzene Benzene Toluene Ethylbenzene Xylenes MtBE TPHg TPHg Benzene Benzene Toluene Ethylbenzene Xylenes (mg/m) (ppmv) (mg/m') (ppmv) (mglm') (mg/m') (mg/m') (mg/m') (m€/m') (ppmv) (mg/m") (ppmv) (mglm') (m8/m') (mg/m') 05-24-99 1,700 448 91 26 56 <5 0 10 NA 90 24 058 017 031 0 075 058 05-26-99 453 12 <0 0500 <0 0160 <0 0500 <0 0500 <0 0500 220 648 184 <00500 <00160 0 141 <0 0500 0 283 05-26-99 System shut down due to low influent concentrations 06-19-99 830 219 32 9 057 <0 25 <0 25 357 65 17 0 30 0 09 <0 OSO <0 050 0 10 06-21-99 87 23 23 07 <0 25 <0 25 044 270 t00 26 027 008 <0 25 <0 25 <0 25 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 08-02-99 System shut down due to low influent concentrations i 08-22-99 2,400 633 61 18 19 <0 5 096 360 26° 7 018 0 OS <D 050 <0 050 <0 050 08-24-99 56 15 1 1 03 <0 25 <0 25 <0 25 350 53 14 <0 050 001 <0 050 <Q 050 <0 050 09-16-99 2,000 527 41 12 45 <010 <010 <0 50 41 11 024 007 <0 010 <0 010 010 09-20-99 97 26 19 05 <0 050 <0 050 <0 050 300 36 9 <0010 <0 003 <0 010 <0 010 <0 010 10-26-99 3,520 928 502 144 <5 00 <5 00 <5 00 170 590 156 121 35 182 611 394 10-29-99 329 87 <0 500 <0144 <0 500 <0 500 387 296 647 171 0 191 0 055 0 181 0 199 1 74 11-16-99 1,190 314 300 86 457 <2 00 105 420 416 110 0 473 014 0 153 0 230 205 11-19-99 148 39 197 057 0 260 0 450 285 195 502 132 0135 0 039 0 373 0 774 686 12-13-99 430 113 12 34 <2 0 <2 0 <2 0 47 55 145 053 015 032 017 25 12-16-99 30 8 072 021 <0 10 <010 017 16 <le <2 6 <0 10 <0 029 <010 <010 019 01-28-00 2,320 612 493 142 464 <1 00 230 <10 0 155 41 0 472 014 00928 <0 0500 0 302 01-31-00 251 66 800 230 <1 00 <1 00 <1 00 198 <100 <2 6 <0 100 <0 029 <0 100 <0100 0 221 02-23-00 280 74 3 1 09 <0 25 <0 25 10 530 28 74 12 03 5 1 083 57 03-01-00 260 69 <0 25 <0 072 <0 25 031 094 95 11 29 <0010 <0 003 014 <0 010 046 03-14-00 255 67 0 433 012 <0 250 <0 250 239 27 189 50 <0100 <0 029 0 601 0 241 168 03-21-00 <10 0 <26 <0100 <0 029 0 133 <0 100 0 322 <1 00 <10 0` <2 6 <0 100 <0 029 <0100 <0 100 0173 04-24-00 System down due to construction at the site? 05-22-00 System down due to construction at the site? 06-26-00 System down due to construction at the site? 07-26-00 System down due to construction at the site? 08-16-00 743 196 <0 0500 <0 014 0 273 0 411 0 356 336 <100 <2 6 <0 0500 <0014 <0 0500 <0 0500 <0 0500 08-21-00 849 224 0 237 0 068 <0 200 0 251 0 462 818 <100' <2 6 <0100 <0 029 <0 100 <0100 <0100 08-31-00 531 140 <0 0500 <0 014 <0 0500 <0 0500 0203 575 <10 06 <26 <0 0500 <0 014 <0 0500 <0 0500 <0 0500 For Explanation refer to page 4 I Stockton,to 6981 140124 04