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Sequoia • • 404 N. , CA Lane <br />a --N <br />� Walnut Creek, CA 94598 <br />(925) 988-9600 <br />Analytical FAX (925) 9abs.co 3 <br />vvww.sequofalabs.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 />Total Purgeable Hydrocarbons by DHS LUFT - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Source %REC RPD <br />Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch 2HO5012 - EPA 5030B McOH <br />Blank (2H05012-BLKI) <br />Prepared: 05 -Aug -02 Analyzed: 06 -Aug -02 <br />Purgeable Hydrocarbons (C6-02) <br />ND <br />1.0 mg/kg <br />Benzene <br />ND <br />0.0050 " <br />Toluene <br />ND <br />0.0050 " <br />Ethylbenzene <br />ND <br />0.0050 " <br />Xylenes (total) <br />ND <br />0.0050 " <br />Surrogate: a,a,a-Trifluorotoluene <br />0.674 <br />0.600 <br />112 <br />40-140 <br />LCS (2H05012-BS1) <br />Prepared: 05 -Aug -02 <br />Analyzed: 06 -Aug -02 <br />Benzene <br />0.596 <br />0.0050 mg/kg <br />0.800 <br />74.5 <br />50-150 <br />Toluene <br />0.754 <br />0.0050 <br />0.800 <br />94.2 <br />50-150 <br />Ethylbenzene <br />0.792 <br />0.0050 <br />0.800 <br />99.0 <br />50-150 <br />Xylenes (total) <br />2.37 <br />0.0050 <br />2.40 <br />98.7 <br />50-150 <br />Surrogate: a,a,a-Triuorotoluene <br />0.690 <br />0.600 <br />115 <br />40-140 <br />Matrix Spike (2H05012-MS1) <br />Source: W208041-02RE1 <br />Prepared: 05 -Aug -02 Analyzed: 06 -Aug -02 <br />Benzene <br />0.680 <br />0.0050 mg/kg <br />0.800 ND <br />85.0 <br />50-150 <br />Toluene <br />0.736 <br />0.0050 <br />0.800 ND <br />92.0 <br />50-150 <br />Ethylbenzene <br />0.750 <br />0.0050 <br />0.800 ND <br />93.8 <br />50-150 <br />Xylenes (total) <br />2.37 <br />0.0050 <br />2.40 ND <br />98.7 <br />50-150 <br />Surrogate: a,a,a-Tris luorotoluene <br />0.482 <br />0.600 <br />80.3 <br />40-140 <br />Matrix Spike Dup (2H05012-MSD1) <br />Source: W208041-02RE1 <br />Prepared: 05 -Aug -02 Analyzed: 06 -Aug -02 <br />Benzene <br />0.590 <br />0.0050 mg/kg <br />0.800 ND <br />73.8 <br />50-150 14.2 <br />Toluene <br />0.700 <br />0.0050 <br />0.800 ND <br />87.5 <br />50-150 5.01 <br />Ethylbenzene <br />0.778 <br />0.0050 <br />0.800 ND <br />97.2 <br />50-150 3.66 <br />Xylenes (total) <br />2.22 <br />0.0050 <br />2.40 ND <br />92.5 <br />50-150 6.54 <br />Surrogate: a,a,a-Tri/luorotoluene <br />0.462 <br />0.600 <br />77.0 <br />40-140 <br />20 <br />20 <br />20 <br />20 <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 he reproduced in its entirety. <br />Page 11 of 20 <br />