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r 819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(91921-0100 <br /> FAX <br /> i <br /> Delta Environmental Consultants(Cameron Park) Project: ARCO 5469, Stockton, CA <br /> 3330 Cameron Park Dr, Ste 550 Project Number: NIA Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 10/01/01 15:20 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1090308- EPA 5030$ [P/Ti <br /> LCS(1090308-1351) Prepared&Analyzed:09/28/01 <br /> Methyl tert-butyl ether 48.8 2.0 ug1l 50.0 97.6 60-I40 <br /> Surrogate; 1,2-DCA-d4 53.1 1. 50.0 106 60-140 <br /> Matrix Spike(1090308-MSI) �_ Source:5109223-07 Prepared&Analyzed:09/28/01 <br /> Methyl tert-butyl ether 45.3 2.0 ug/l 50.0 ND 87.6 60-140 <br /> Surrogate: 1,2-DCA-d4 48.3 11 50.0 96.6 60-140 <br /> Matrix Spike Dup(1090308-MSDI) Source: 5109223-07 Prepared&Analyzed:09/28/01 <br /> Methyl tert-butyl ether 50.5 2.0 ug/I 50.0 ND 98.0 60-140 10.9 25 <br /> Surrogate: 1,2-DCA-d4 52.4 50.0 105 60-140 <br /> uoia 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 10 of 13 <br />