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1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> ,:D (747)792-1865 <br /> 11W Analytical FAX(707)192-0342 <br />. www sequoialabs com <br /> URS Corp-Sacramento Project BP Heritage Site 11191,Stockton,Ca P407064 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36368 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07126104 1148 <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 %REC Limits RPD Limit Notes <br /> Batch 4070265-EPA 50308 waters <br /> Matrix Spike(4070265-MS1) Source P407064-02 Prepared&Analyzed 07/15/04 <br /> Teri-amyl methyl ether 2600 500 ug/l 2500 ND 104 78-117 <br /> Benzene 2740 250 2500 ND 110 81-118 <br /> Ten-butyl alcohol 60700 10000 50000 ND 121 60-147 <br /> Di-isopropyl ether 2960 500 2500 ND 118 70-125 <br /> Ethanol 69700 50000 50000 ND 139 55-200 <br /> Ethylbenzene 2800 250 2500 ND 112 89-122 <br /> Ethyl tert-butyl ether 2730 500 2500 ND 109 71-120 <br /> Methyl tert-butyl ether 18500 250 2500 15000 140 70-122 QM04 <br /> Toluene 2760 250 2500 ND 110 84-119 <br /> Xylenes(total) 8430 250 7500 ND 112 86-132 <br /> Surrogate Dibromofluoromethane 477 400 119 84-122 <br /> arrogate 12-Drchloroethane-d4 514 400 128 74-135 <br /> Surrogate Toluene-d8 449 400 112 84-119 <br /> Surrogate 4-Bromofluorobenzene 450 400 112 86-119 <br /> Matrix Spike Dup(4070265-MSD1) Source P407064-02 Prepared&Analyzed 07/15/04 <br /> Tert-amyl methyl ether 2540 500 ug11 2500 ND 102 78-117 2 20 <br /> Benzene 2560 250 2500 ND 102 81-118 7 20 <br /> Tert butyl alcohol 67700 10000 50000 ND 135 60-147 11 20 <br /> Di-isopropyl ether 2820 500 2500 ND 113 70-125 5 20 <br /> Ethanol 84100 50000 50000 ND 168 55-200 19 20 <br /> i <br /> Ethylbenzene 2640 250 2500 ND 106 89-122 6 20 <br /> Ethyl tert-butyl ether 2640 500 2500 ND 106 71-120 3 20 <br /> Methyl tert-butyl ether 17400 250 2509 15000 96 70-122 6 20 <br /> Toluene 2650 250 2500 ND 106 84-119 4 20 <br /> Xylenes(total) 8050 250 7500 ND 107 86-132 5 20 <br /> Surrogate Dibromofluoromethane 469 400 117 84-122 <br /> Surrogate 1 2-Drchloroethane-d4 487 400 122 74-135 <br /> Surrogate Toluene-d8 444 400 111 84-119 <br /> Surrogate 4-Bromofluorobenzene 436 400 109 86-119 <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 10 of 12 <br />