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Sequoia 819 Straker Avenue Suite 8 <br /> Sacramento CA 95834 <br /> (916)921-9600 <br /> FAX(916)921-0100 <br /> Analytical www sequoialabs com <br /> Delta Environmental Consultants(Cameron Park) Project Arco 6080,Lathrop,CA <br /> 3330 Cameron Park Dr Ste 550 ProjectNumber N/A Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 07/09/01 13 42 <br /> Volatile Organic Oxygenated Compounds by EPA Method 8260E - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Linos Level Result %uREC Limits RPD Limit Notes <br /> Batch 1060142-EPA 5030E [P/TJ <br /> Blank(1050142-BLKI) Prepared&Analyzed 06/29/01 <br /> 1,2-Dibromoethane ND 20 ug/1 <br /> 1,2-Dtchloroethane ND 20 <br /> Di-isopropyl ether ND 20 <br /> Ethyl tert-butyl ether ND 20 " <br /> Methyl tert-butyl ether ND 20 " <br /> Tert-amyl methyl ether ND 20 " <br /> Tert-butyl alcohol ND 100 " <br /> Surrogate 12-Dichloraethane-d4 511 500 102 76-114 <br /> Surrogate Toluene-d8 502 500 100 88-110 <br /> Blank(1060142-BLK2) Prepared&Analyzed 07/0I/01 <br /> ,2-Dibromoethane ND 20 ugh -- --- —-- <br /> 1,2-Dtchloroethane ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 <br /> Methyl Cert-butyl ether ND 20 <br /> Tert-amyl methyl ether ND 20 <br /> Tert-butyl alcohol ND 100 " <br /> Surrogate 12-Dichloroethane-d4 499 500 998 76-114 <br /> Surrogate Toluene-d8 527 500 105 88-110 <br /> LCS(1060142-BS1) Prepared&Analyzed 06/29/01 <br /> Methyl Cert-butyl ether 562 20 ug/l Soo 112 70-130 <br /> Surrogate 1 2-Dtchloroethane-d4 506 500 101 76-114 <br /> Surrogate Toluene-d8 .500 .500 100 88-110 <br /> LCS(1060142-BS2) Prepared&Analyzed 07/01/01 <br /> Methyl tert-butyl ether 529 20 u2// 500 106 70-130 <br /> Surrogate 1 2-Dtchloroethane-d4 518 500 104 76-114 <br /> Surrogate Toluene-d8 499 500 998 88-110 <br /> Sequola 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 5 of 7 <br />