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9455 McDowell Blvd North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> a— ) <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P403320 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50265 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 04/05/04 1106 <br /> BTEX by EPA Method 8260E-Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Luiut Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4C25003-EPA 5030B P/T <br /> Blank(4C25003-BLKI) Prepared&Analyzed 03/25/04 <br /> Benzene ND 050 ug/l <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate 12-Dichloroethane-d4 447 500 894 78-129 <br /> Laboratory Control Sample(4C25003-BSI) Prepared&Analyzed 03/25/04 <br /> Benzene 105 0 50 ug/I 100 105 69-124 <br /> Toluene 101 050 100 101 78-129 <br /> Surrogate 1 2-Dichloroethane-d4 428 500 856 78-129 <br /> Laboratory Control Sample Dup(4C25003-BSDI) Prepared&Analyzed 03/25/04 <br /> enzene 924 050 ug/1 100 924 69-124 12 8 20 <br /> ene 864 050 " 100 864 78-129 15 6 20 <br /> Surrogate 12-Dichloroethane-d4 452 500 904 78-129 <br /> Matrix Spike(4C25003-MS1) Source.P403320-01 Prepared 03/25/04 Analyzed 03/26/04 <br /> Benzene 103 050 ug/l 800 ND 129 69-124 QM01 <br /> Toluene 995 050 800 ND 124 78-I29 <br /> Surrogate 12-Dichloroethane-d4 4 76 500 952 78-129 <br /> Matrix Spike Dup(4C25003-MSDI) Source P403320-01 Prepared 03/25/04 Analyzed 03/26/04 <br /> Benzene 102 050 ug/l 800 ND 128 69-124 0 976 20 QM01 <br /> Toluene 995 050 800 ND 124 78-129 000 20 <br /> Surrogate 12-Dichloroethane-d4 467 500 934 78-129 <br /> �uoia Analytical -Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise staled results are reported on a wet weight basis <br /> This analytical report must he reproduced in its entirety <br /> Page 12 of 16 <br />