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819 Striker Avenue,Suite 8 <br /> ,!DSequoia Sacramento,CA 95834 <br /> Analytical (916)921-9600 <br /> FAX(916)921-0100 <br /> www sequoiatabs corn <br /> it <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 Progect 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 M20011-EPA 5030B(PIT) <br /> BIank(1L20011-_13LKl) _ _ _Prepared&Analyzed 12/20/01 <br /> tert Butyl alcohol ND 20 ug/l T T <br /> Methyl cert-butyl ether(MTBE) ND 2 0 " <br /> Di-isopropyl ether ND 2 0 <br /> Ethyl tert-butyl ether ND 20 <br /> tent-Amyl methyl ether ND 20 <br /> Surrogate Dibromofluoromethane 51 2 500 102 50-150 <br /> Surrogate 12-Dichloroethane-d4 566 500 113 50-150 <br /> Blank iL20011-BLK2 Prepared&Analyzed 12/21/01 <br /> tert-Butyl alcohol ND 20 ug/l <br /> Methyl tert-butyl ether(MTBE) ND 20 " <br /> Dr-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 <br /> tart-Amyl methyl ether ND 20 <br /> Surrogate Dibromofluoromethane 508 500 102 50-150 <br /> Surrogate 1 2-Dachloroethane-d4 548 500 110 50 150 <br /> LCS(1L20011-BSI) Prepared&Analyzed 12/20/01 <br /> Methyl tert-butyl ether(MTBE) 41 5 2 0 ugll 500 83 70-130 <br /> Surrogate Dibromofluoromethane 502 500 100 50 150 <br /> Surrogate 1 1 Dachloroethane-d4 56 1 500 112 50 150 <br /> LCS(1L20011-BS2) Prepared&Analyzed 12/21/01 <br /> Methyl tert-butyl ether(MTBE) 45 3 2 0 ug/1 50 0 91 70-130 <br /> Surrogate Dibromofluoromethane 50 7 50 0 101 50-150 <br /> Surrogate 12-Dachloroethane-d4 542 50 0 108 50-150 <br /> Matrix Spike(1L2001I-MS1) Source 5112139-07 Prepared&Analyzed 12/20/01 <br /> Methyl tert-butyl ether(MTBE) 469 20 ugll 500 ND 94 60-150 <br /> Surrogate Dibromofluoromethane 500 50 0 100 50-150 <br /> Surrogate 12-Dachloroethane-d4 493 50 0 99 50-150 <br /> .Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain u <br /> of custody document This analytical report must be reproduced in its entirety <br /> Page Page 11 of 13 <br />