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a— ) <br /> Sequoia 1455 tvtcDowP Blvd,North Ste 4 Petaluma,CA 98954W Analytical (707)792 1342 <br /> Y FAX(707)792-0342 <br /> www sequoialabs co <br /> � <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P403078 <br /> 3017 Ktlgare Road Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 03/19/04 15 02 <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 4030378-EPA 5030B waters <br /> Matrix Spike 4030378-MS1) Source P403221-01 Prepared&Analyzed 03/15/04 <br /> Benzene 4 45 0 50 ugll 500 ND 89 81-118 <br /> Ethylbenzene 4 61 050 500 ND 92 89-122 <br /> Methyl tert-butyl ether 453 0 50 500 ND 91 77-123 <br /> Toluene 4 22 050 5 00 ND 84 84-119 <br /> Xylenes(total) 13 9 0 50 150 ND 93 86-132 <br /> Surrogate Dibromofluoromethane 5 51 600 91 84-121 <br /> Surrogate 1,1-Dichloroethane-d4 537 600 90 74-135 <br /> Surrogate Toluene-d8 590 600 98 84-119 <br /> Matnx Spike 1up_{4030378-MSDI) Source P403221-01 _Prepared&Analyzed 03/15/04 <br /> Benzene 4 65 0 50 ug/l 5 00 ND 93 81-118 4 20 <br /> Ethylbenzene 479 050 5 00 ND 96 89-122 4 20 <br /> Methyl tert-butyl ether 4 55 050 5 00 ND 91 77-123 0 4 20 <br /> Toluene 435 0 50 500 ND 87 84-119 3 20 <br /> Xylenes(total) 149 0 50 15 0 ND 99 86-132 7 20 <br /> Surrogate Dibromofluorom ethane 5 31 6 00 88 84-111 <br /> Surrogate 1 2-Dtchloroethane-d4 544 6 00 91 74-135 <br /> Surrogate Toluene-d8 5 86 6 00 98 84-119 <br /> Batch 4030416-EPA 5030B waters <br /> Blank(4030416-BLK1) Prepared&Analyzed 03/15/04 <br /> Benzene ND 0 50 ug/l <br /> Ethylbenzene ND 050 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 0 50 " <br /> Surrogate Dibrom ofluorom ethane 5 07 5 00 101 84-112 <br /> Surrogate 11-Dtchloroethane-d4 5 19 5 00 104 74-135 <br /> Surrogate Toluene-d8 4 40 500 88 84-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain. <br /> of custody document Unless otherwise stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 18 of 23 <br />