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1455 McDowell Blvd,North Ste D <br /> 4D Sequoia , Petaluma,CA 94954 <br /> (707)792-I965 <br /> �r Analytical FAX(707)792.0342 <br /> www sequotalabs com <br /> • <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P406495 <br /> 2870 Gateway Oaks Dnve Suite 300 Project Number intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/29/04 17 56 <br /> BTEX by EPA Method 8260B -Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> Reporting Spike Source %nREC RPD <br /> [A.alyte Result Limit Units Level Result °/eREC Limits RPD Limit Notes <br /> Bateb 4GO8001 -EPA 5030B PIT <br /> Laboratory Control Sample Dup(4G08001-BSD1) Prepared&Analyzed 07/08/04 <br /> Benzene 948 050 ug/I I D O 95 69-124 l 20 <br /> Ethylbenzene 10 2 050 too 102 84 132 0 20 <br /> 'toluene 9 82 050 too 98 78-129 2 20 <br /> Xylenes(total) 314 050 300 105 83-137 0 3 20 <br /> Surrogate 12-Dichloroethane-0 2 17 250 87 78-129 <br /> Laboratory Control Sample Dup(4G08001-BSD2) Prepared&Analyzed 07/08/04 <br /> Benzene 5 19 050 ugll 640 81 69-124 2 20 <br /> Ethylbenzene 760 050 696 109 84 132 0 20 <br /> Toluene 308 050 297 104 78-129 1 20 <br /> Xylenes(total) 381 050 337 113 83-137 0 3 20 <br /> Surrogate 12-Dichloroethane-d4 228 250 91 78-129 <br /> • <br /> i <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain 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 31 of 41 <br />