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a_ � <br /> 885 JamsDmc <br /> Seq11oia Moan Hill(408)176 9640 <br /> W Analytical FAX(408)7826308 <br /> www sequoialabs com <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MNJO793 <br /> 3017 Kilgore Rd Suite 100 Project Number 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 11/12/04 12 23 <br /> Purgeable Hydrocarbons and Volatile Organic Compounds by EPA method 8260B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4K10006-EPA 5030B PST/EPA 8260B <br /> Matrix Spike(4KI0006-MSI) Source MNK0227-07 Prepared&Analyzed 11/10/04 <br /> Methyl tert-butyl ether 7290 50 UFA 992 6300 100 63-137 <br /> Gasoline Range Organics(C4-C12) 43300 5000 44000 7400 82 70-124 <br /> Benzene 514 50 640 ND 80 69-124 <br /> Toluene 3240 50 3190 ND 102 78-129 <br /> Ethylbenzene 776 50 752 ND 103 84-132 <br /> Xylenes(total) 3810 50 3660 Nil 104 83-137 <br /> Surrogate 1 2-Drchloroelhane-d4 534 506 107 78-129 <br /> Matrix Spike Dup(4K10006-MSDI) Source MNK0227-07 Prepared 11/10/04 Analyzed I1/11/04 <br /> Methyl tert-butyl ether 7300 50 ug/I 992 6300 101 63-137 01 20 <br /> Gasoline Range Organics(C4-C12) 34700 5000 44000 7400 62 70-124 22 20 BA,LN <br /> Benzene 443 50 640 ND 69 69-124 15 20 <br /> Toluene 2580 50 3190 ND 81 78-129 23 20 RB <br /> Ethylbenzene 607 50 752 ND 81 84-132 24 20 BA,LN <br /> Xylenes(total) 3010 50 3660 ND 82 83-137 23 20 BA,LN <br /> Surrogate 1 2-Dichloroethane d4 4 72 5 00 94 78-129 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance wrth 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 entirely <br /> Page 14 of 22 <br />