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equo i a 685 Jarvis Dr <br /> Morgan Hill,CA 95037 <br /> Analytical (408)776-9600 <br /> FAX(408)782-6308 <br /> www.sequoialabs.com <br /> tratus Environmental Inc. Project: ARCO W5:69,Stockton CA <br /> 330 Cameron Park Dr.,Suite 550 Project.Number: ARCO#5469,Stockton, CA Reported:1 <br /> Cameron Park CA,95682 Project Manager: Jay Johnson Reported: <br /> 01/07/03 12:15 <br /> Volatile Organic Compounds by EPA Method 8260E -- 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 2L20026-EPA 5030B PIT <br /> Blank(2L20026-BLK1) Prepared: 12/19/02 Analyzed: 12/20/02 <br /> Ethanol ND 4Dg/1 <br /> u --.. <br /> tert-Butyl alcohol ND 20 <br /> Methyl tert-butyl ether ND 0.50 " <br /> Di-isopropyl ether ND 0.50 " <br /> Ethyl tent-butyl ether ND 0.50 <br /> t--rt-Amyl methyl ether Nb 0.50 " <br /> 1,2-Dichlomethanc ND 0.50 " <br /> 1,2-Dibromoethanc(EDB) ND 0.50 " <br /> Surrogate:1,2-Dichloroethane-d4 5.65 5.00 <br /> 113 78-129 <br /> Laboratory Control Sample(2L20026-BSI) Prepared: I2119/02 Analyzed: 12/20/02 <br /> *ehyl tert-butyl ether — 9.71 O'5 ag/l 10.0 <br /> 97,1 63-137 <br /> Surrogate.'1,2-Dichloroethane-d4 5.27 <br /> 5,00 <br /> 105 78-129 <br /> Laboratory Control Sample Dtt (2L20026-BSDI) Prepared: 12/19/02 Analyzed: 12/20/02 <br /> Methyl tert-butyl ether 9.39 0.50 u9il 10.0 <br /> 93.9 63-137 3,35 13 <br /> Surrogate: 1,2-Dichloroethane-d4 5.40 5.00 <br /> !08 78.129 <br /> Batch ZL24009-EPA 5030B PIT <br /> Blank(2L24008-BLKI) Prepared&Analyzed: 12/24/02 <br /> Ethanol ND 40 ug/1 <br /> tert-Butyl alcohol ND 20 „ <br /> Methyl tert-butyl ether ND 0.50 " <br /> Di-isopropyl ether ND 0.50 <br /> Ethyl tert-butyl ether ND 0.50 „ <br /> tert-Amyl methyl ether ND 0.50 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> 1,2-Dibromocthanc(EDB) ND 0.50 ^ <br /> Surrogate: 1,2-Dichforoethane-d4 5.91 5.00 <br /> 118 78•I29 <br /> oia Analytical -Morgan Hill The results in this pp re ort a ly to the samples analyzed in accordance with the chain of <br /> p <br /> custody document. Unless oche—ise stated,results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety. <br /> Page 1S of 20 <br />