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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> 6) <br /> (707)792-1865 <br /> Analytical <br /> FAX(707)792 0342 <br /> • www sequoialabs corn <br /> URS Corp-Sacramento Pr4lect BP Heritage Site 11191,Stockton,Ca P310466 <br /> 2870 Gateway Oaks Drive Suite 300 Protect Number WR36368 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 11/04/03 16 09 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyse Result Limit Units Level Result %REC Limits RPD Lunn Notes <br /> Batch 3100829-EPA 5030 waters <br /> Laboratory Control Sample(3100829-BSI) Prepared&Analyzed 10/31/03 <br /> Tert amyl methyl ether 556 10 ug/l 500 111 70-116 <br /> Benzene 451 050 500 90 81-118 <br /> Tert-butyl alcohol 974 20 100 97 62-I42 <br /> Di-isopropyl ether 582 10 500 116 71-121 <br /> Ethanol 100 100 100 100 65-135 <br /> Ethylbenzene 541 0 50 5 00 108 89-122 <br /> Ethyl tert-butyl ether 5 72 1 0 500 114 71-110 Q-29 <br /> Methyl Cert-butyl ether 5 97 050 5 00 119 77-123 <br /> Toluene 533 050 5 00 107 84-119 <br /> Xylenes(total) 153 050 15 0 102 86-132 <br /> Surrogate Dibromofluoromelhane 5 06 500 101 84-121 <br /> WUrrogate 1 2-Dichloroethane-d4 5 04 500 101 74-135 <br /> rrogate Toluene d8 509 500 102 84-119 <br /> Laboratory Control Sample Dup(3100829-BSDI) Prepared&Analyzed 10/31/03 <br /> Teri-amyl methyl ether 492 10 ugll Soo 98 70-116 12 20 <br /> Benzene 495 050 500 99 81-118 9 20 <br /> Teri-butyl alcohol 927 20 100 93 62-142 5 20 <br /> Di-isopropyl ether 493 10 5 00 99 71-121 17 20 <br /> Ethanol 78 0 100 100 78 65-135 25 20 QR-02 <br /> Ethylbenzene 538 050 500 108 89-122 0 6 20 <br /> Ethyl tert-butyl ether 546 10 5 00 109 71-110 5 20 <br /> Methyl tert-butyl ether 504 050 5 00 101 77-123 17 20 <br /> Toluene 5 16 050 500 103 84-119 3 20 <br /> Xylenes(total) 149 050 15 0 99 86-132 3 20 <br /> Surrogate Dibromofluoromethane 551 500 110 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 5 68 500 114 74-135 <br /> Surrogate Toluene d8 520 500 104 84-119 <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 13 of I4 <br />