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a— ) (707) <br /> Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma CA 94954 <br /> qWAnalytical 792-1662 <br /> FAX(707)792-0342 <br /> www sequoialabs col, <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P309112 <br /> 3017 Ktlgare Road Suite 100 Project Number 30732 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 09/16/03 18 59 <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 3090291-EPA 5030 waters <br /> Matrix Spike(3090291-MSI) - Source P309039-03 Prepared&Analyzed 09/14/03 <br /> Tart-amyl methyl ether 25 1 5 0 ug/1 250 ND 100 70 116 <br /> Benzene 429 2 5 " 250 17 104 81-118 <br /> Tert-butyl alcohol 290 100 500 ND 58 62-142 Q-LIM <br /> Di-isopropyl ether 249 so 25 0 ND 100 71-121 <br /> 1,2-Dibromoethane(EDB) 26 8 25 25 0 ND 107 92-117 <br /> 1,2-Dichloroethane 26 6 25 250 ND 106 79 126 <br /> Ethanol 233 500 500 ND 47 65-135 Q LIM <br /> Ethylbenzene 79 2 2 5 25 0 53 105 89-122 <br /> Ethyl tert-butyl ether 245 50 25 0 ND 98 71-110 <br /> Methyl tert-butyl ether 303 25 25 0 5 0 101 77-123 <br /> Toluene 34 1 25 1. 250 8 2 104 84 119 <br /> Xylenes(total) 115 2 5 750 34 108 86-132 <br /> Surrogate Dibromofluoromeihane 6 14 600 102 84-122 <br /> Surrogate 12-Dichloroethane-d4 583 11600 97 74-135 <br /> Surrogate Toluene-d8 597 11600 100 84-119 <br /> Surrogate 4-Bromofluorobenzene 599 11600 100 86-119 <br /> Matrix Spike Du (3090291-MSD]) Source P309039-03 Prepared&Analyzed 09/t4/03 <br /> Tert-amyl methyl ether 246 5 0 ug/1 25 0 ND 98 70-116 2 20 <br /> Benzene 43 .5 2 5 25 0 17 106 81 118 1 20 <br /> Tert-butyl alcohol 346 100 500 ND 69 62-142 18 20 <br /> Di-isopropyl ether 25 6 5 0 25 0 ND 102 71-121 3 20 <br /> 1,2-Dibromoethane(EDB) 264 2 5 25 0 ND 106 92-117 2 20 <br /> 1,2-Dichloroethane 26 7 2 5 25 0 ND 107 79-126 0 4 20 <br /> Ethanol 414 500 500 ND 83 65-135 56 20 QR-07 <br /> Ethylbenzene 80 7 2 5 25 0 53 111 89-122 2 20 <br /> Ethyl tert-butyl ether 25 4 5 0 25 0 ND 102 71-I10 4 20 <br /> Methyl tart-butyl ether 30 9 2 5 25 0 5 0 104 77 123 2 20 <br /> Toluene 346 2 5 25 0 8 2 106 84-119 1 20 <br /> Xylenes(total) 117 2 5 75 0 34 111 86-132 2 20 <br /> Surrogate Dtbromofluoromethane 6 13 " 600 102 84-112 <br /> Surrogate 1 2-Dtchloroethane-d4 5 73 600 96 74-135 <br /> Surrogate Toluene-0 600 600 100 84-119 <br /> Surrogate 4-Bromof]'uorobenzene 596 600 99 86-119 <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 to its entirety 0 <br /> Page 8 of 11 <br />