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1455 McDowell Blvd,North Ste D <br /> a— ) <br /> Sequoia Petal(ma,C792-1865954 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs cam <br /> URS Corp-Sacramento project Arco Site 2130,Stockton,CA P406495 <br /> 2870 Gateway Oaks Drive 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 °/oREC RPD <br /> Analyte Result Limit Units Level Result %REC Lunas RPD Limit Notes <br /> Batch 4GO7040-EPA 5030B P/T <br /> Matrix Spike Dap(4G07040-MSD1) Source MNF0733-06 Prepared 07/07/04 Analyzed 07/08/04 <br /> Benzene 5610 50 ugR 640 4900 111 69-124 2 20 <br /> Ethylbenzene 3160 50 696 2300 124 84-132 3 20 <br /> Toluene 3260 50 2970 82 107 78-129 2 20 <br /> Xylenes(total) 9450 50 3370 5300 123 83-137 3 20 <br /> Surrogate 12-Dichloroerhane-d4 223 250 89 78-119 <br /> Batch 4GO8001 -EPA 5030B PIT <br /> Blank(4G08001-BLKI) Prepared&Analyzed 07/08/04 <br /> Benzene ND 050 agtl <br /> Ethylbenzene ND 050 " <br /> Toluene ND 050 " <br /> .waYvlenes(total) ND 050 " <br /> rrogwe 1 2-Dichloroe1hane-d4 110 250 84 78-129 <br /> Laboratory Control Sample(4G08001-BS1) Prepared&Analyzed 07/08/04 <br /> Benzene 939 0 50 ug/l 10 0 94 69-124 <br /> Ethylbenzene 102 050 10 0 102 84-132 <br /> Toluene 962 050 10 0 96 78-129 <br /> Xylenes(total) 315 050 30 0 105 83-137 <br /> Surrogate 12-Dichloroethane-d4 210 250 84 78-119 <br /> Laboratory Control Sample(4G08001-BS2) Prepared&Analyzed 07/08/04 <br /> Benzene 5 11 0 50 ugll 640 80 69-124 <br /> Ethylbenzene 760 050 696 109 84-132 <br /> Toluene 30 4 050 29 7 102 78-129 <br /> Xylenes(total) 390 050 337 113 83-137 <br /> Surrogate 12-Dtchlaroelhane-d4 117 2 50 87 78-129 <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 wee weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 30 of 41 <br />