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1455 McDowell Blvd,North Ste D <br /> i:DSequoia PetalumaCA <br /> A992 48954 <br /> 65 <br /> m/ Analytical FAX(707)792 0342 <br /> www sequoialabs cam <br /> Secor-Rancho Cordova Project Arco Site 4932,Stockton,CA P406416 <br /> 3017 Kilgare Road Suite 100 Project Number WR 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/14/04 16 40 <br /> DRAFT: Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> DRAFT. EFF(P406416-01)Water Sampled 06/17/04 09 00 Received 06/17/04 11 40 <br /> Benzene ND 050 ug/1 1 4070006 07/01/04 07/01/04 EPA 8260B <br /> Ethylbenzene ND 050 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate Dibromofluoromethane 112% 84-112 " <br /> Surrogate 1,2-Dichloroethane-d4 113% 74-135 " <br /> Surrogate Toluene-d8 109% 84-119 ^ <br /> DRAFT INF(P406416-02)Water Sampled 06/17/04 09 20 Received 06/17/04 1140 <br /> Benzene 180 100 ugll 200 4070006 07/01/04 07/01/04 EPA 8260B <br /> Ethylbenzene ND 100 " <br /> Methyl tert-butyl ether 7200 100 <br /> Toluene 400 100 " <br /> Xylenes(total) 500 100 i <br /> Surrogate Dibromofluoromethane 113% 84-122 " <br /> Surrogate 12-Dichloroethane-d4 111% 74-135 <br /> Surrogate Toluene-d8 109% 84-119 " <br /> DRAFT AS-EFF(P406416-03)Water Sampled 06/17/04 09 15 Received 06/17/04 11 40 <br /> Benzene ND 050 ug/l 1 4070006 07/01/04 07/01/04 EPA 8260E <br /> Ethylbenzene 097 050 " <br /> Methyl tert-butyl ether 100 050 E <br /> Toluene 078 050 " <br /> Xylenes(total) 11 050 " <br /> Surrogate Dtbromofluoromethane 114% 84-122 <br /> Surrogate 1,2-Dichloroethane-d4 118% 74-135 <br /> Surrogate Toluene-d8 111% 84-119 " <br /> DRAFT REPORT The results In this report apply pply to the samples analyzed an accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wee weight basis <br /> This analytical report must be reproduced in its entirely 0 <br /> Page 6 of 20 <br />