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w y, <br /> 819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> 4D (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> isT" www sequoialabs corn <br /> Delta Environmental Consultants(Cameron Park) Project ARCO 2186,Stockton,CA <br /> 3330 Cameron Park Dr Ste 550 Project Number IIIA Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 10/18/01 13 43 <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 °/aREC Limits APD Limit Notes <br /> Batch 1090105-EPA 5030B [PIT] <br /> Matrix Spike Du (1090105-MSD1) Source L109084-02 Prepared&Analyzed 09/25/01 <br /> Methyl tert-butyl ether 59 1 20 ug/l 50 0 18 82 2 60-140 3 58 25 <br /> Surrogate 1 2-Dxchloroethane-d4 452 50 0 904 76-114 <br /> Batch 1090106-EPA 5030B [PIT] _ <br /> Blank(1090106-BLKl) Prepared&Analyzed 09/26/01 <br /> Ethanol ND 1000 ug/l <br /> Tert-butyl alcohol ND 100 <br /> Methyl tert-butyl ether ND 20 <br /> Di-isopropyl ether NrD 20 <br /> Ethyl tert-butyl ether ND 20 <br /> Tert-amyl methyl ether ND 20 <br /> Surrogate 12-Dichloroethane-d4 51 0 50 0 102 76-114 <br /> LCS(1090106-BSI) - Prepared&Analyzed 09/26/01 <br /> Methyl tert-butyl ether 53 1 20 ug/1 50 0 106 70-130 <br /> Surrogate 1 2-1)4chloroethane-d4 519 1 Soo 104 76-114 <br /> Matrix Spike(1090106-MS1) Source L109104-08 Prepared&Analyzed 09/26/01 <br /> Methyl tent-butyl ether 53 0 20 ugll 500 ND 106 60-140 <br /> Surrogate 1 2-Dichloroethane-d4 489 " 500 978 76 114 <br /> Matrix Spike bap{1090106-MSD1) Source L109104-08 Prepared&Analyzed 09/26/01 <br /> Methyl tert-butyl ether 56 1 20 ugll 500 ND 112 60-140 5 50 25 <br /> Surrogate 1 2-Dxchloroethane-d4 535 500 107 76-114 <br /> Sequoia Analytical-Sacramento The results in this repos t apply to the samples analyzed in accordance with the chain <br /> of custody document This analytical report must be reproduced in its entirety <br /> Page Page 12 of 13 <br />