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885 Jarvis Dnoe <br /> Sequoia Morgan Hill,CA 95037 <br /> 4D (408)776.9600 <br /> 40 1W Analytical FAX(408)782-6308 <br /> www sequotalabscom <br /> Secor-Rancho Cordova(ARCO) Project ARCO 44932,Stockton,CA MMJ0614 <br /> 3017 Kilgore Rd Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 11/04/03 16 52 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical- Petaluma <br /> Reporting Spike Source %RFC RPD <br /> Analyte Result Lmut Units Level Result %REG Limits RPD Lumt Nous <br /> Batch 3100778-EPA 5030 waters <br /> Laboratory Control Sample Dup(3100778-BSDI) Prepared&Analyzed 10/30/03 <br /> Surrogate Toluene-d8 519 ug/l 500 104 84-119 <br /> Batch 3100829-EPA 5030 waters <br /> Blank(3100829-BLK1) Prepared&Analyzed 10/31/03 <br /> Tert amyl methyl ether ND 10 ug/1 <br /> Tert butyl alcohol ND 20 " <br /> Di-isopropyl ether ND to " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethyltert-butylether ND 10 " <br /> ethyl tert-butyl ether ND 050 " <br /> Surrogate Dibromo,Jluoromethane 536 500 107 84-122 <br /> Surrogate 12-Dtehloroethane d4 592 500 118 74-135 <br /> Surrogate Toluene-d8 494 500 99 84-119 <br /> Laboratory Control Sample(3100829-BSI) Prepared&Analyzed 10/31/03 <br /> Tert-amyl methyl ether 556 10 up/l 500 111 70-116 <br /> Tert-butyl alcohol 974 20 100 97 62-142 <br /> Di-isopropyl ether 582 10 500 116 71-121 <br /> 1,2-Dibromoethane(EDB) 557 050 500 1 l 1 92-117 <br /> 1,2-Dichloroediane 487 050 500 97 79-126 <br /> Ethanol 100 100 100 100 65-135 <br /> Ethyl teit-butyl ether 572 10 500 114 71-110 Q-29 <br /> Methyl tert-butyl ether 597 050 500 119 77-123 <br /> Surrogate Dibromojluoromethane 506 500 101 84-122 <br /> Surrogate 12-Dichloroethane-d4 504 500 101 74-135 <br /> Surrogate Toluene-d8 509 500 102 84-119 <br /> 40equola Analytical-Morgan Hill 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 /> 8of10 <br />