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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento CA 95834 <br /> 4D (916)921-9600 <br /> IRWAnalytical FAX(916)921-0100 <br /> www scquoialabs cam <br /> Delta Environmental Consultants(Cameron Park) Project ARCO 2186,Stockton,CA <br /> 3330 Cameron Park Dr Ste 550 Project Number 2186,Stockton,CA Reported <br /> Cameron Park CA,95682 P"ed Manager jay Johnson 12/27/01 15 45 <br /> Volatile Organic Compounds by EPA Method 8260B- 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 1L20011-EPA 5030B(PIT) <br /> Matrix Spike Dup(1L20011-MSD1) Source S112139-07 Prepared&Analyzed 12/20/01 <br /> Methyl tert butyl ether(MTBE) 51 1 20 ug/l 500 ND 102 60 150 9 25 <br /> Surrogate Dibromofluoromethane 51 1 500 102 50-150 <br /> Surrogate 12 Dichloroethane-d4 525 500 105 50-150 <br /> i <br /> .Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document This analytical report must be reproduced in its entirety <br /> Page Page 12 of 13 <br />