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" Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> (707)792-1865 <br /> s t4 Analytical FAX(707)792-0342 <br /> www sequotalabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P306252 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intnm-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/27/03 17 13 <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 8015B/8021B- Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Y� Result Limit Units level Result VoREC Limits RPD Limit Notes <br /> Batch 3060546-EPA 5030,waters <br /> Blank(3060546-BLKI) Prepared&Analyzed 06/23/03 <br /> Gasoline Range Organics ND 50 ug/l <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate a a a-Tnfluorotoluene 304 300 101 65-135 <br /> Surrogate 4-Bromofluorobenzene 183 300 94 65-135 <br /> Laboratory Control Sample(3060546-BSI) Prepared&Analyzed 06/23/03 <br /> Gasoline Range Organics 2310 50 ug/l 2750 84 65-135 <br /> Benzene 383 050 335 114 65-135 <br /> Toluene 199 050 202 99 65-135 <br /> ]benzeme 454 050 475 96 65-135 <br /> enes(total) 219 050 240 91 65-135 <br /> Surrogate a a a-Wuorotoluene 327 300 109 65-135 <br /> Surrogate 4-Bromofluorobenzene 300 300 100 65-135 <br /> Matrix S ike(3060546-MS1) Source P306425-03 Prepared&Analyzed 06/23/03 <br /> Gasoline Range Organics 2310 50 ug/l 2750 ND 84 65-135 <br /> Benzene 385 050 " 335 ND 115 65-135 <br /> Toluene 201 050 " 202 021 99 65-135 <br /> Ethylbenzene 461 050 475 ND 97 65-135 <br /> Xylem(row) 223 050 240 ND 93 65-135 <br /> Surrogate aa a-7Yifluorotoluene 330 300 110 65-135 <br /> Surrogate 4-Bromofluorobenzene 301 " 300 100 65-135 <br /> Matrix Spike Dup(3060546-MSDI) Source P306425-03 Prepared&Analyzed 06/23/03 <br /> Gasoline Range Organics 2290 _- 50 ug/1 2750 ND 83 65-135 09 20 <br /> Benzene 38 1 050 335 ND 114 65-135 1 20 <br /> Toluene 199 050 202 021 98 65-135 1 20 <br /> Ethylbenzene 459 050 " 475 ND 97 65-135 04 20 <br /> Xylenes(total) 219 050 240 ND 91 65-135 2 20 <br /> Surrogate a a a-Tnfluorotoluene 324 300 108 65-135 <br /> Surrogate 4-Bromofluorobenzene 298 300 99 65-135 <br /> �uoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chair of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 21 of 27 <br />