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819 Striker Avenue,Suite 6 <br /> Sequoia Sacrame(916)9 99600 <br /> (91b)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www sequoialabs com <br /> atus Environmental Project ARCO 6080,Lathrop,CA <br /> 3330 Cameron Park Drive, Ste 550 Projeet Number N/A Reported <br /> Cameron Park CA,95682 Project Manage, Jay Johnson 06/28/02 13 09 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2060343-EPA 5030B [PIT] <br /> Blank(2060343-BLKl) Prepared&Analyzed 06/26/02 <br /> Tert-butyl alcohol ND 50 ug/l <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 050 " <br /> Ethanol ND 50 " <br /> 1,2-Dichloroethane ND 050 " <br /> Surrogate 1 2-BCA-d4 23 7 250 95 60-140 <br /> LCS(2060343-BSI) Prepared&Analyzed 06/26/02 <br /> Methyl tert-butyl ether 237 050 ug/l 250 95 60-140 <br /> Surrogate 1 2-DCA-d4 264 " 250 106 60-140 <br /> AdIhitrix Spike(2060343-MS1) Source S206305-01 Prepared&Analyzed 06/26/02 _ <br /> 'Wethyl tert-butyl etber 218 050 ug/l 250 ND 87 60-140 <br /> Surrogate 1 2-DCA-d4 250 11250 100 60-140 <br /> Matrix Spike Dup(2060343-MSD1) Source S206305-01 Prepared&Analyzed 06/26/02 <br /> Methyl tert-butyl ether 234 050 ug/l 250 ND 94 60-140 7 25 <br /> Surrogate 12-DCA-d4 265 250 106 60-140 <br /> Almik <br /> quoia 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 Page 5 of 6 <br />