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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma CA 94954 <br /> Analytical (707)792- <br /> 1865 <br /> FAX(707)792-0342342 <br /> www sequoiakabs corn <br /> URS Corp-Sacramento Protect BP Heritage Site 11194,Tracy,Ca P401433 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36365 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 02/11/04 16 31 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> A»alyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4020142-EPA 5030B waters <br /> Blank 4020142-BLK1Prepared&Analyzed 02/05/04 <br /> Tert-amyl methyl ether ND 1 0 ug/1 <br /> Benzene ND 0 50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1 0 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0 SO " <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate Dibromofluoromethane 441 450 98 84-122 <br /> rrogale 12-Dichloroethane-d4 439 4 50 98 74-135 <br /> Surrogate Toluene-d8 442 450 98 84-119 <br /> Laboratou Control Sample 4020142-11S1 Prepared&Analyzed 02/05/04 <br /> Tert-amyl methyl ether 5 17 1 0 ugll 5 00 103 78-117 <br /> Benzene 545 0 50 500 109 81-118 <br /> Tert-butyl alcohol 120 20 100 120 60-147 <br /> Di-isopropyl ether 5 71 1 0 5 00 114 70-125 <br /> Ethanol 125 100 100 125 55-200 <br /> Ethylbenzene 5 52 050 " 5 00 110 89-122 <br /> Ethyl ten-butyl ether 5 15 1 0 5 00 103 71-120 <br /> Methyl tert-butyl ether 532 050 5 00 106 70-122 <br /> Toluene 5 16 050 5 00 103 84-119 <br /> Xylenes(total) 166 0 50 15 0 111 86-I32 <br /> Surrogate Dibromofluoromethane 433 450 96 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 4 21 450 94 74-135 <br /> Surrogate Toluene-d8 455 450 101 84-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise staled results are reported on a wet weight <br /> 0 basis This analytical report must be reproduced in its entirety <br /> Page 14 of]8 <br />