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' Sequoia an nal Road <br /> San Carlos(650 23 -9600 <br /> (650)232-9600 <br /> Analytical FAX(650)232-9612 <br /> www sequoialabs corn <br /> ler-Ryan/GeostrategieS(1) Project Unocal(4) <br /> Sierra Court, Suite 3 Project Number Former Unocal#5098& Montgmery Ward Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 03/26/02 12 44 <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 Units Level Result %REC Limits RPD Limit Notes <br /> atch 2030031 -EPA 5030B IP/T <br /> Blank(2030031-BLK2) Prepared&Analyzed 03/15/02 <br /> firt_lanol ND 500 ug/I <br /> butyl alcohol ND 20 " <br /> Methyl tert-butyl ether ND 1 0 <br /> i-isopropyl ether ND 1 0 <br /> thyl tert-butyl ether ND 1 0 " <br /> Tert-amyl methyl ether ND 1 0 " <br /> ??ogate 12 Dtchloroethane-d4 51 1 500 104 70-130 <br /> CS(2030031-BS 1) Prepared&Analyzed 03/14/02 <br /> Methyl tert-butyl ether 45 7 1 0 ug/1 500 914 70-130 <br /> I??agate 1 1-Dtchloroethane-d4 502 500 100 70-130 <br /> CS(2030031-BS2} Prepared&Analyzed 03/15/02 <br /> 1 terl-butyl ether 495 1 0 ug/1 500 990 70-130 <br /> ate 1 2 Dichlo?oethane-d4 548 " 500 110 70-130 <br /> Matrix Spike(2030031-MS1) Source L202134-08 Prepared&Analyzed 03/14/02 <br /> 9ethyl tert-butyl ether 483 1 0 ug/l 500 ND 966 60-140 <br /> Krrogate 12-Dichlo?oethane-d4 51 7 500 103 70-130 <br /> Matrix Spike Du (2030031-MSD1) Source L202134-08 Prepared&Analyzed 03114/02 <br /> ethyl tert-butyl ether 474 1 0 ug/l 500 ND 948 60-140 188 25 <br /> 01�urrogate 1 2-Dichlaroethane-d4 51 7 500 103 70-130 <br /> 1 <br /> Sga Analytical - San Carlos The?esults in this repo?i apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be?eproduced in its entirety <br />' Page 90 of 91 <br />