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I . Table 1 - Summary of VESemical Analytical Data • Unocal Service Station No 6981 r 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 (mglm3) (ppmv) (mg/m') (ppmv) (mg/m') (mglm3) (Mg/M3) (mg/m3) (mg/m} (Ppmv) (mg/m) (PPmv) (mg/m') (mg/m3) (mg/m) 05-24-99 1,700 448 91 26 56 <50 10 NA 90 24 058 017 031 0 075 058 05-26-99 45 3 12 <00500 <00160 <00500 <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 17 030 009 <0 050 <0 050 0 10 06-21-99 87 23 23 07 <0 25 <0 25 044 270 100 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 08-22-99 2,400 633 61 18 19 <05 096 360 26° 7 0 l8 0 OS <0 O50 <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 <0 050 <0 050 09-16-99 2,000 527 41 12 45 <0 10 <0 10 <0 50 41 11 024 007 <0 010 <0 010 0 10 09-20-99 97 26 1 9 05 <0 050 <0 050 <0 050 300 36 9 <0 010 <0 003 <0 010 <0 010 <0010 10-26-99 3,520 928 502 144 <5 00 <5 00 <5 00 170 590 156 121 35 18 2 6 11 394 10-29-99 329 87 <0 500 <0 144 <0 500 <0 500 387 296 647 17 1 0 191 0 055 0 181 0 199 174 11-16-99 1,190 314 300 86 457 <2 00 105 420 41 6 110 0 473 0 14 0 153 0 230 205 11-19-99 148 39 197 057 0 260 0 450 285 195 502 132 0 135 0 039 0 373 0 774 686 12-13-99 430 113 12 34 <20 <20 <20 47 55 145 053 015 032 0 17 25 12-16-99 30 8 072 021 <0 10 <0 10 017 16 <106 <2 6 <0 10 <0 029 <0 10 <0 10 019 01-28-00 2,320 612 493 142 464 <1 00 230 <100 15 5 4 1 0 472 014 00928 <0 0500 0 302 01-31-00 251 66 800 230 <1 00 <1 00 <1 00 198 <10 0 <2 6 <0 100 <0 029 <0 100 <0 100 0 221 02-23-00 280 74 3 1 09 <0 25 <0 25 10 530 28 74 12 03 5 1 083 5 7 03-01-00 260 69 <0 25 <0 072 <0 25 031 094 95 11 29 <0 010 <0 003 014 <0 010 046 03-14-00 255 67 0 433 012 <0 250 <0 250 239 27 18 9 50 <0 100 <0 029 0 601 0 241 168 03-21-00 <10 0 <2 6 <0 100 <0 029 0 133 <0 100 0 322 <1 00 <10 05 <2 6 <0 100 <0 029 <0 100 <0 100 0 173 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 sitw 07-26-00 System down due to construction at the site? 08-16-00 74 3 196 <0 0500 <0 014 0 273 0 411 0 356 336 <10 0 <26 <0 0500 <0 Ot4 <0 0500 <0 0500 <0 0500 08-21-00 849 224 0 237 0 068 <0 200 0 251 0 462 8 18 <10 OS <26 <0 100 <0 029 <0 100 <0 100 <0 100 08-31-00 53 1 140 <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