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819 Striker Avenue Suite 8 <br /> Se5834 <br /> uoia Sacramento )9 9600 9 <br /> q (916)921 9600 <br /> FAX(916 <br /> Analytical <br /> www sequvialabs alabs com <br /> SECOR International-Rancho Cordova Project 'POSCO 8671,Stockton,CA <br /> 3017 Kilgore Road,Suite 100 Project Number NIA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 01/14/02 15 16 <br /> Volatile Organic Compounds by EPA Method 8260H - Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1120279-EPA 5030B [MeOH] <br /> Blank(1120279-BLKI) Prepared&Analyzed 12/21/01 <br /> Tert butyl alcohol ND 10 mg/kg <br /> Methyl tert-butyl ether ND 0 10 " <br /> Di-isopropyl ether ND 0 10 " <br /> Ethyl Cert-butyl ether ND 0 10 " <br /> Tert-amyl methyl ether ND 0 10 <br /> Ethanol ND 150 " <br /> 1,2-Dichloroethane ND 0 10 " <br /> Ethylene dibromide ND 0 10 " <br /> Surrogate 1 2-DCA-d4 307 2 50 123 60-140 <br /> LCS(1120279-BSI) Prepared&Analyzed 12/21/01 <br /> Methyl tert-butyl ether 256 0 10 mg/kg 250 102 60-140 <br /> 0urrogate 1 2-DCA-d4 306 2 50 122 60-140 <br /> LCS Dup(1120279-BSD1) Prepared&Analyzed 12/21/01 <br /> Methyl tert-butyl ether 270 0 10 mg/kg 2 50 108 60-140 5 32 25 <br /> Surrogate 12-DC,4-d4 3 19 2 50 128 60-140 <br /> Batch 1120289-EPA 5030B [PIT] <br /> Blank(1120289-BLK1) Prepared&Analyzed 12/26/01 <br /> Tert-butyl alcohol ND 5 0 ugA <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 0 50 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Tert-amyl methyl ether ND 0 50 " <br /> Ethanol ND 50 " <br /> 1,2-Dichloroethane ND 0 50 " <br /> Ethylene dibromide ND 050 " <br /> Surrogate 12-DCA-d4 280 25 0 112 60-140 <br /> equola Analytical- Sacramento The results in this report apply to the samples analyzed to accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page Page 22 of 27 <br />