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819 Striker Avenue,Suwtc 8 <br /> a— ) Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www sequoialabs corn <br /> . URS-Sac Gateway Oaks Project ARCO 2093,Tracy,CA <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number 2093,Tracy,CA Reported <br /> Sacramento CA,95833 Project Manager Vernon Elarth 07/16/02 17 03 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Sacramento <br /> Reporang Spike Source %REC RPD <br /> Analyte Result Limit Units LC4e1 Result %REC Limits RPD Limit Notes <br /> Batch 2070079-EPA 5030B JP/T] <br /> Blank 2070079-BLKI Prepared&Analyzed 07/09/02 <br /> Tert-butyl alcohol ND 5 0 ug/l <br /> Metbyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tett-butyl ether ND 0 50 " <br /> Tert-amyl methyl ether ND 050 " <br /> Ethanol ND 50 " <br /> Surrogate 1 2-DCA-d4 288 250 115 60-140 <br /> LCS 2070079-BSI) Prepared&Analyzed 07/09/02 <br /> Methyl tert-butyl ether 26 6 050 119/1 21 8 122 60-140 <br /> Surrogate 12-ACA-d4 291 " 250 116 60-140 <br /> Matrix S Ike(2070079-MS I) Source S207053-02 Prepared&Analyzed 07/09/02 <br /> Ana�Methyl tert-butyl ether 242 050 ug/l 21 8 ND lit 60-140 <br /> Surrogate 1 1-DCA-d4 268 250 107 60-140 <br /> Matrix Spike Du 2070079-MSDI) Source S207053-02 Pre ared&Analyzed 07/09/02 <br /> Methyl tert-butyl ether 249 0 50 ug/1 21 8 ND 114 60-I40 3 25 <br /> Surrogate 12-DCA-d4 265 250 106 60-140 <br /> Batch 2070090-EPA 5030B PIT <br /> Blank 2070090-BLKI Prepared&Analyzed 07/10/02 <br /> Tert-butyl alcohol ND 5 0 u1711 <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Tert-amyl methyl ether ND 0 50 " <br /> Ethanol ND 50 <br /> Surrogate 12-DCA-d4 266 250 106 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document This analytical report must he reproduced in its entirety <br /> Page Page 9 of l I <br />