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819 Stilt.Ave Su; <br /> Sequoia SacmmevW,m,CA 958344 <br /> `S Analytical FAX(916)921-9600 <br /> (916)921-9100 <br /> � www.sequvialaM.wm <br /> ENGEO,Inc.-Tracy Project: Matlock Property S408221 <br /> 2880 N.Tracy Blvd.,Ste.3 Project Number: N/A Reported: <br /> Tracy CA,95376 Project Manager: Casey Lee Jensen 08/24/04 16:44 <br /> EDB and DBCP by EPA Method 504.1 -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 4H19020-EPA 504 <br /> Blank(4H19020-BLKI) Prepared&Analyzed:08/19/04 <br /> 1,2-Dibromoethane(EDB) ND 0.020 ug/l <br /> 1,2-Dibromo-3-ehloropropane ND 0.010 " <br /> r <br /> Surrogate:1,3-Dibromopropane 2.67 1.86 93 37-101 <br /> Laboratory Control Sample(4Hl902O-BS1) Prepared&Analyzed:08/19/04 <br /> 1,2-Dibromoethane(EDB) 0.225 0.020 ugA 0.250 90 70-130 <br /> r 1,2-Dibromo-3chloropropane 0.208 0.010 0.250 83 70-130 <br /> Surrogate:1,3-Dibromopropane 2.70 1.86 94 37-101 <br /> _ Laboratory Control Sample Dup(4H19020-BSD1) Prepared&Analyzed:08/19/04 <br /> 1,2-Dibromoethane(EDB) 0.260 0.020 ug(l 0.250 104 70-130 14 20 <br /> 1,2-Dibromo-3-chloropropane 0.230 0.010 0.250 92 70-130 10 20 <br /> Surrogate:1,3-Dibromopropane 3.12 1.86 109 37-102 Sol <br /> r <br /> bw <br /> Sequoia Analytical- Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document. Unless otherwise stated,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> Page 5 of 7 <br />