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404 N. Wiget Lane <br />Sequoia Walnut Greek, 94598 <br />-9600 <br />(925) 98 98 8-9600 <br />FAX (925) 988-9673 <br />Analytical www.sequoialabs.com <br />Secor - Rancho Cordova Project: Arco <br />3017 Kilgore Rd., Ste. #100 Project Number: Arco # 2133, Stockton Reported: <br />Rancho Cordova CA., 95670 Project Manager: Rusty Benkosky 14 -Aug -02 13:16 <br />Volatile Organic Compounds by EPA Method 826013 <br />Sequoia Analytical - Walnut Creek <br />Reporting <br />Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br />SP -1, A,B (W208041-02) Soil Sampled: 02 -Aug -02 11:30 Received: 02 -Aug -02 14:50 <br />Isopropylbenzene <br />ND <br />0.20 <br />mg/kg 100 2HO5003 05 -Aug -02 05 -Aug -02 EPA 8260B <br />1,1,2,2 -Tetrachloroethane <br />ND <br />0.20 <br />" <br />Bromobenzene <br />ND <br />0.20 <br />" <br />n-Propylbenzene <br />ND <br />0.10 <br />" <br />1,2,3-Trichloropropane <br />ND <br />0.25 <br />" <br />2-Chlorotoluene <br />ND <br />0.20 <br />1,3,5 -Tri methylbenzene <br />ND <br />0.20 <br />" <br />4-Chlorotoluene <br />ND <br />0.10 <br />" <br />tert-Butylbenzene <br />ND <br />0.20 <br />1,2,4-Trimethylbenzene <br />ND <br />0.20 <br />" <br />sec -Butyl benzene <br />ND <br />0.25 <br />" <br />p-Isopropyltoluene <br />ND <br />0.20 <br />1,3 -Dichlorobenzene <br />ND <br />0.10 <br />" <br />1,4 -Dichlorobenzene <br />ND <br />0.10 <br />n-Butylbenzene <br />ND <br />0.20 <br />1,2 -Dichlorobenzene <br />ND <br />0.10 <br />1,2-Dibromo-3-chloropropane <br />ND <br />0.50 <br />" <br />1,2,4-Trichlorobenzene <br />ND <br />0.20 <br />Naphthalene <br />ND <br />0.25 <br />" <br />Hexachlorobutadiene <br />ND <br />0.50 <br />1,2,3-Trichlorobenzene <br />ND <br />0.50 <br />" <br />Surrogate: Dibromofluoromethane <br />96.8% <br />50-150 " <br />Surrogate: 1,2-Dichloroethane-d4 <br />107% <br />50-150 " <br />Surrogate: Toluene -d8 <br />118 % <br />50-150 " <br />Surrogate: 4-Bromofluorobenzene <br />III % <br />50-150 " <br />Sequoia Analytical - Walnut Creek <br />The results in this report apply to the samples analyzed in accordance with the chain of <br />custody document. This analytical report must be reproduced in its entirety. <br />Page 8 of 20 <br />