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819 Striker Avenue Suite 8 <br /> Sequoia <br /> Sacramento(916)921-9600 <br /> FAX(916)921-0100 <br /> Analytical www sequolalabs com <br /> 4ro <br /> SECOR International-Rancho Cordova Project Arco 4932,Stockton,CA <br /> 3017 Kilgore Road,Suite 100 Project Number NIA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 05/29/01 17 59 <br /> Volatile Oxygenate Compounds by EPA Method 8260A - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %RI-C RPD <br /> JAnalyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1050210- EPA 5030B [P/TJ <br /> Blank(1050210-BLKI) - - ---- -- — -Prepared&Analyzed 05/16/01 <br /> Tert-butyl alcohol ND 200 ug/l <br /> Methyl tert-butyl ether ND 200 <br /> Di-isopropyl ether ND 200 <br /> Ethyl tert-butyl ether ND 200 " <br /> Tert-amyl methyl ether ND 200 " <br /> Ethanol ND 3000 <br /> 12-Dichloroethane ND 200 " <br /> Ethylene dibronude ND 200 <br /> Surrogate 1 2-DCA-d4 529 500 106 60-140 <br /> LCSW". k,gate <br /> (105_0_210-BS1) Prepared&Analyzed 05/16/01 —_ <br /> Cert-butyl ether546 200 ug/I 500 109 60-140 <br /> l 2-DCA-d4 523 500 105 60-140 <br /> Matr_ixSpike(1050210-MSI)_ _—-_ _ Source 5105167-05 — Prepared&Analyzed 05/16/01 -- __-- - - <br /> Methyl tent-butyl ether 526 200 ug/l 500 ND 105 60-140 <br /> Surrogate 12-DCA-d4 507 500 101 60-140 <br /> Matrix Spike Dup(1050210-MSD1) _ _ _Source S105167-05 Prepared&Analyzed 05/16/01 <br /> Methyl tent-butyl ether _ - 539 200 ug/I 500 ND 109 60-140 244 25 <br /> Surrogate 1 2-DCA-d4 530 500 - 106 60-140 <br /> uoia 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 8 of 9 <br />