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1455 McDowell Blvd,North Ste D <br />•� <br /> Sequoia Petaluma CA 94954 <br /> `1 (707)792-1865 <br /> FAX792-0342 <br /> Analytical <br /> www sequotquoialabs wm <br /> • <br /> URS Corp-Sacramento Project Arco Site 2168,Stockton,CA P405290 <br /> 2870 Gateway Oaks Drrve Suite 300 Project Number WR36590 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/02/04 19 44 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source "/oREC RPD <br /> Analyte Result Limit Units Level Result "/oREC Limits RPD Limit Notes <br /> Batch 4050558-EPA 5030B waters <br /> Matrix Spike(4050558-MSI) Source P405290-01 Prepared&Analyzed 05/22/04 <br /> Tert-amyl methyl ether 543 100 ugll 500 ND 109 78-117 <br /> Benzene 1400 50 500 890 102 81-118 <br /> Tert-butyl alcohol 10800 2000 10000 ND 108 60-147 <br /> Di-isopropyl ether 537 too 500 ND 107 70-125 <br /> 1,2-Dibromoethane(EDB) 575 50 5o0 ND 115 85-125 <br /> 1,2-Dichloroethane 655 50 500 ND 131 77-126 QCoI <br /> Ethanol 9760 10000 10000 ND 98 55-200 <br /> Ethylbenzene 523 50 500 ND 105 89-122 <br /> Ethyl tert-butyl ether 553 10o 500 ND 111 71-120 <br /> Methyl tert-butyl ether 556 50 500 19 107 70-122 <br /> Toluene 537 50 500 ND 107 84-119 <br /> Xylenes(total) 1720 50 1500 48 111 86-132 <br /> urrogate DibromoJluoromethane 496 500 100 84-122 <br /> 'WSurrogate 12-Dichloroethane-d4 540 500 108 74-135 <br /> Surrogate Toluene-d8 467 500 93 84-119 <br /> Surrogate 4-Bromofluorobenzene 478 Soo 96 86-119 <br /> Matrix Spike Dup(4050558-MSDI) Source P405290-01 Prepared&Analyzed 05/22/04 <br /> Tert-amyl methyl ether 542 100 ugll 500 ND 108 78-117 02 20 <br /> Benzene 1390 50 500 890 100 81-118 07 20 <br /> Tert-butyl alcohol 11000 2000 10000 ND 110 60-147 2 20 <br /> Di-isopropyl ether 556 100 500 ND 111 70-125 3 20 <br /> 1 2-Dibromoethane(EDB) 596 50 500 ND 119 85-125 4 20 <br /> 12-Dichloroethane 640 50 500 ND 128 77-126 2 20 QC01 <br /> Ethanol 9610 10000 " 10000 ND 96 55-200 2 20 <br /> Ethylbenzene 547 50 500 ND 109 89-122 4 20 <br /> Ethyl tert-butyl ether 568 100 500 ND 114 71-120 3 20 <br /> Methyl tent-butyl ether 594 50 500 19 115 70-122 7 20 <br /> Toluene 522 50 500 ND 104 84-119 3 20 <br /> Xylenes(total) 1720 50 " 1500 48 111 86-132 0 20 <br /> Surrogate Dibromofluoromethane 522 500 104 84-122 <br /> Surrogate 1,2-Dtchloroethane-d4 549 500 110 74-135 <br /> Surrogate Toluene-d8 456 500 91 84-119 <br /> Surrogate 4-Bromofluorobenzene 482 500 96 86-119 <br /> Sequoia Analytical -Petaluma 77ie 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 14 of 17 <br />