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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792 1865 <br /> FAX(707)792-0342 <br /> Analytical www sequoialabs corn <br /> URS Corp-Sacramento Project BP Heritage Site 11191,Stockton,Ca P407064 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number "36368 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/26/04 11 48 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %uREC Limits RPD Limit Rotes <br /> Batch 4070265-EPA 50308 waters <br /> Blank(4070265-BLKI) Prepared&Analyzed 07/15/04 <br /> Tert-amyl methyl ether ND 1 0 ug/l <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 10 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 050 <br /> Ethyl tent-butyl ether ND 10 <br /> Methyl Cert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 452 400 113 84-122 <br /> Surrogate 12-Drchloroethane-d4 454 „ 4 00 114 74-135 <br /> Surrogate Toluene-d8 449 400 112 84-119 <br /> Surrogate 4-Bromofluorobenzene 398 4 00 100 86-119 <br /> Laboratory Control Sample(4070265-BSI) Prepared&Analyzed 07/15/04 <br /> Tert-amyl methyl ether 4 83 10 ugll 500 97 78-117 <br /> Benzene 4 74 050 500 95 81-118 <br /> Tert butyl alcohol 115 20 100 115 60-147 <br /> Di-isopropyl ether 5 11 10 500 102 70-125 <br /> Ethanol 130 100 100 130 55-200 <br /> Ethylbenzene 497 050 500 99 89-122 <br /> Ethyl tert-butyl ether 4 85 10 500 97 71-120 <br /> Methyl tent-butyl ether 507 050 500 t01 70-122 <br /> Toluene 4 84 050 500 97 84-119 <br /> Xylenes(total) 150 0 50 150 100 86-132 <br /> Surrogate Drbromofluoromethane 443 400 111 84-112 <br /> Surrogate 12-Dichloroethane-d4 442 400 110 74-135 <br /> Surrogate Toluene-d8 444 400 111 84-119 <br /> Surrogate 4 Bromoffuorobenzene 435 400 109 86-119 <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 9 of 12 <br />