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819 Striker Avenue,Suite 8 <br /> Sacramento,CA 95834 <br /> a— ) Sequoia i FAX(916)921-9600 <br /> FAX(916)921-0100 <br /> www sequoialabs com <br /> Amok <br /> elta Environmental Consultants(Cameron Park) Project ARCO 2186, Stockton,CA <br /> 3330 Cameron Park Dr Ste 550 Project Number N/A Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 10/08/01 15 39 <br /> Volatile Organic Oxygenated Compounds by EPA Method 8260B -Quality Control <br /> Sequoia Analytical- San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1090105-EPA 5030B ]P/T] <br /> Matrix Spike Du 1090105-MSD1 Source L109084-02 Pre ared&Analyzed 09/25/01 <br /> Methyl tert-butyl ether 59 1 2 0 ug/l 50 0 18 82 2 60-140 3 58 25 <br /> Surrogate 1 2-Dichloroethane-d4 452 500 904 76-114 <br /> Batch 1090106-EPA 5030B IPITI <br /> Blank 1090106-BLKI Prepared&Analyzed 09/26/01 <br /> Ethanol ND 1000 ug/I <br /> Tert-butyl alcohol ND 100 <br /> Methyl tert-butyl ether ND 2 0 <br /> Di-isopropyl ether ND 2 0 <br /> Ethyl tert-butyl ether ND 2 0 " <br /> Tert-amyl methyl ether ND 2 0 " <br /> Surrogate 12-Dichloroethane-d4 51 0 500 101 76-114 <br /> Am CS 1090106-BSI) Prepared&Analyzed 09/26/01 <br /> qw <br /> Methyl tert-butyl ether 53 1 20 ug/l 500 106 70-130 <br /> Surrogate 1 2-Drchloroethane-d4 51 9 11500 104 76-114 <br /> Matrix Spike(1090106-MSI) Source L109104-08 Prepared&Analyzed 09/26/01 <br /> Methyl tert-butyl ether 53 0 20 ug/l 500 ND 106 60-1411 <br /> Surrogate 11-Drchloroethane-d4 489 11500 978 76-114 <br /> Matrix Spike Dup(1090106-MSDI) Source L109104-08 Prepared&Analyzed 09/26/01 <br /> Methyl tert-butyl ether 56 1 20 u9/1 500 ND 112 60-140 5 50 25 <br /> Surrogate 1 2-Dichloroethane-d4 53 5 50 0 107 76-114 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed to accordance with the chain <br /> of custody document This analytical report must be reproduced in its entirety <br /> Page Page 12 of 13 <br />