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S l9 Striker Avenue,Suite 8Sequ®ia Sacramento,CA <br /> 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> wwwsequoialabs.com <br /> Delta Environmental Consultants(Cameron Park) Project: ARCO 548,Stockton,CA <br /> 3330 Cameron Park Dr. Project Number: N/A Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 03/29/01 11:40 <br /> Volatile Organic Compounds by EPA Method 8260A - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1027017-EPA 5030B PIT <br /> Blank(1C27017-BLKI) Prepared&Analyzed: 03/23/01 <br /> tert-Butyl alcohol ND 20.0 ug/l <br /> Methyl tent-butyl ether ND 1.00 " <br /> Di-isopropyl ether ND 1.00 " <br /> Ethyl Cert-butyl ether ND 1.00 " <br /> tert-Amyl methyl ether ND 1.00 " <br /> 1,2-Dichloroethane ND 1-00 " <br /> Ethylene dibromide ND 1.00 " <br /> Surrogate:1,2-Dichloroethane-d4 8.96 " _ 10.0 89.6 70-130 <br /> LCS(1C27017-BSI) Prepared&Analyzed: 03/23/01 <br /> Methyl tert-butyl ether 10.8 1.00 ug/l 10.0 108 70-130 <br /> ate:1,2-Dichloroethane-d4 9.78 " 10.0 97.8 70-130 <br /> Matrix Spike(IC27017-MS1) Source; 5103261-06 Prepared:03/23/01 Analyzed:03/24/01 <br /> Methyl tert-butyl ether 12.6 1.00 ug/l 10.0 2.12 105 70-130 <br /> Surrogate:l,2-Dichloroethane-d4 10.1 " 10.0 101 70-130 <br /> Matrix Spike Dup(1027017-MSD/) Source:S103261-06 Prepared:03/23/01 Analyzed:03/24/01 <br /> Methyl tert-butyl ether 135 1.00 ug/l 10.0 2.12 114 70-130 6.90 25 <br /> Surrogate:l,2-Dichloroethane-d4 T 10.4 " 10.0 104 70-130 <br /> oia 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 /> Pace 7 of 8 <br />