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819 Striker Avenue,Suite 8 <br /> J e qu o i a Sacramento,CA 95834 <br /> (916)921-9600 <br /> FAX(916)921-0100 <br /> Analytical www.sequoialabs.com <br /> Delta Environmental Consultants(Cameron Park) Project. ARCO 5469,Stockton,CA <br /> 3330 Cameron Park Dr.Ste 550 Project Number: 5469,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: Steve Carter 01/08/02 15:42 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analytc Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2010063 -EPA 5030B ]PIT] <br /> Matrix Spike(2010063-MSI) Source: 5112392-07 Prepared&Analyzed:01/07/02 <br /> Methyl tert-butyl ether 21.8 0.50 ugn 25.0 NI) 87.2 60-140 <br /> Surrogate.'1,2-DCA-d4 25.9 25.0 104 60-140 <br /> Matrix Spike Dup(2010063-MSD1) _ Source: 5112392-07 Prepared&Analyzed: 01/07/02 <br /> Methyl tort-butyl ether 25.0 0.50 ug/l 25.0 ND 100 60-140 13.7 25 <br /> Surrogate:1,1-DCA-d4 26.3 15.0 105 60-140 — -� <br /> i <br /> IIW <br /> quuIa Analytical- Sacramento 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 13 of 14 <br />