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• • 404 N. Wiget Lane <br />Sequoia Walnut Creek, 98 94598 <br />-9600 <br />(925) 988-9600 <br />FAX (925) 988-9673 <br />,-!D- <br />Analyticalwww.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 8260B - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Source %REC RPD <br />knalyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch 2HO5003 - EPA 5030B (MeOH) <br />LCS (2H05003-BS1) <br />Prepared & Analyzed: 05 -Aug -02 <br />I,I-Dichloroethene <br />2.39 <br />0.20 mg/kg <br />2.50 <br />95.6 <br />65-135 <br />Methyl tert-butyl ether (MTBE) <br />2.12 <br />0.20 <br />2.50 <br />84.8 <br />70-130 <br />Benzene <br />2.08 <br />0.20 <br />2.50 <br />83.2 <br />70-130 <br />Trichloroethene <br />2.09 <br />0.25 <br />2.50 <br />83.6 <br />70-130 <br />Toluene <br />2.14 <br />0.50 <br />2.50 <br />85.6 <br />70-130 <br />Chlorobenzene <br />2.32 <br />0.10 <br />2.50 <br />92.8 <br />70-130 <br />Surrogate: Dibromofluoromethane <br />2.32 <br />2.50 <br />92.8 <br />50-150 <br />Surrogate: 1,2-Dichloroethane-d4 <br />2.51 <br />2.50 <br />100 <br />50-150 <br />Surrogate: Toluene -d8 <br />2.81 <br />2.50 <br />112 <br />50-150 <br />Surrogate:4-Bromofluorobenzene <br />2.75 <br />2.50 <br />110 <br />50-150 <br />Matrix Spike (2H05003-MS1) <br />Source: W208041-02 <br />Prepared & Analyzed: 05 -Aug -02 <br />1,1-Dichloroethene <br />2.28 <br />0.20 mg/kg <br />2.50 <br />ND <br />91.2 <br />60-140 <br />Methyl tert-butyl ether (MTBE) <br />2.18 <br />0.20 <br />2.50 <br />ND <br />87.2 <br />60-150 <br />Benzene <br />2.11 <br />0.20 <br />2.50 <br />ND <br />84.4 <br />60-140 <br />Trichloroethene <br />2.18 <br />0.25 <br />2.50 <br />ND <br />87.2 <br />60-140 <br />Toluene <br />2.32 <br />0.50 <br />2.50 <br />ND <br />92.8 <br />60-140 <br />Chlorobenzene <br />2.35 <br />0.10 <br />2.50 <br />ND <br />94.0 <br />60-140 <br />Surrogate: Dibromofluoromethane <br />2.32 <br />2.50 <br />92.8 <br />50-150 <br />Surrogate: 1,2-Dichloroethane-d4 <br />2.71 <br />2.50 <br />108 <br />50-150 <br />Surrogate: Toluene -d8 <br />2.92 <br />2.50 <br />117 <br />50-150 <br />Surrogate: 4-Bromofluorobenzene <br />2.77 <br />2.50 <br />111 <br />50-150 <br />Matrix Spike Dup (2H05003-MSD1) <br />Source: W208041-02 <br />Prepared & Analyzed: 05 -Aug <br />-02 <br />l,l-Dichloroethene <br />2.64 <br />0.20 mg/kg <br />2.50 <br />ND <br />106 <br />60-140 <br />14.6 25 <br />Methyl tert-butyl ether (MTBE) <br />2.59 <br />0.20 <br />2.50 <br />ND <br />104 <br />60-150 <br />17.2 25 <br />Benzene <br />2.48 <br />0.20 <br />2.50 <br />ND <br />99.2 <br />60-140 <br />16.1 25 <br />Trichloroethene <br />2.60 <br />0.25 <br />2.50 <br />ND <br />104 <br />60-140 <br />17.6 25 <br />Toluene <br />2.59 <br />0.50 <br />2.50 <br />ND <br />104 <br />60-140 <br />11.0 25 <br />Chlorobenzene <br />2.66 <br />0.10 <br />2.50 <br />ND <br />106 <br />60-140 <br />12.4 25 <br />Surrogate: Dibromofluoromethane <br />2.33 <br />2.50 <br />93.2 <br />50-150 <br />Surrogate:l,2-Dichloroethane-d4 <br />2.78 <br />2.50 <br />111 <br />50-150 <br />Surrogate: Toluene -d8 <br />2.96 <br />2.50 <br />118 <br />50-150 <br />Surrogate:4-Bromofluorobenzene <br />2.76 <br />2.50 <br />110 <br />50-150 <br />Sequoia Analytical - Walnut Creek 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 17 of 20 <br />