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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> 4D (916)921-9600 <br /> Analytical FAX 921-0100 <br /> www sequoiequoialabs corn <br /> URS-Sac Venture Oaks Project ARCO 6020,Manteca,CA <br /> 2520 Venture Oaks Way,Ste 250 Project Number 6020,Manteca,CA Reported <br /> Sacramento CA,95833-3200 Project Manager Verne Elarth 07/08/02 16 27 <br /> Total Purgeable Hydrocarbons and BTEX by DHS LUFT-Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limas RPD Limit Notes <br /> Batch 2070021 -EPA 50308 P/T <br /> Blank(2070021-BLKI) Prepared&Analyzed 06/27/02 <br /> Purgeable Hydrocarbons ND 50 ug/I <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate a a a-Trifluorotoluene 105 100 105 60-140 <br /> LCS(2070021-BSI) Prepared&Analyzed 06/27/02 <br /> Benzene 101 050 ug/i 100 101 70-130 <br /> Toluene 10 8 050 10 0 108 70-130 <br /> Ethylbenzene 108 050 10 0 108 70-130 <br /> Xylenes(total) 31 6 050 30 0 105 70-130 <br /> Wurrogate a a a-Try7uorotoluene 106 100 106 60-140 <br /> CS Du 2070021-BSD/ Prepared&Analyzed 06/27/02 <br /> Benzene 101 050 ug/1 10 0 101 70-130 0 25 <br /> Toluene 104 050 10 0 104 70-130 4 25 <br /> Ethylbenzene 107 050 10 0 107 70-130 0 9 25 <br /> Xylenes(total) 308 050 30 0 103 70-130 3 25 <br /> Surrogate a a a-Trruorotoluene 109 100 109 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 be reproduced in its entirety <br /> Page Page 6 of 9 <br />