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1 819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento, 92 95834 <br /> (916)921-96009600 <br /> FAX(916)921-0100 <br /> Analytical www.sequoialabs.com <br /> Delta Environmental Consultants(Cameron Park) Project: ARCO 548,Stockton,CA <br /> 3330 Cameron Park Dr. Ste 550 Project Number: NIA Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 09/18/01 11:39 <br /> Total Purgeable Hydrocarbons, BTEX and MTBE in Air (ppmv) by DHS LIFT - 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 1090087-EPA 5030E (PIT) <br /> LCS Dup(1090087-BSD1) Prepared&Analyzed:09/07/01 <br /> Surrogate:a,a,a-Trifluorotoluene --------- 0-00242 -��.— ppmv ---0.00200 121 60-140 <br /> Batch 1090090-EPA 5030B Lpm <br /> Blank(1090090-BLK1) Prepared&Analyzed: 09/06/01 <br /> Purgeable Hydrocarbons ND 2.8 ppmv <br /> Benzene ND 0.016 " <br /> Toluene ND 0.013 " <br /> Ethyibenzene ND 0.012 " <br /> Xylenes(total) ND 0.012 " <br /> Methyl tert-butyl ether ND O.14 " <br /> rogate:a,a,a-Trii6uorotoluene 0.00194 0.00200 97.0 60-140 <br /> LCS(1090090-BS1) Prepared&Analyzed:09106/0I <br /> Surrogate a,a,a-Trifluorotoluene 0.00218 ppmv —0.00200 109 60-140 <br /> LCS Dup(1090090-BSD1) Prepared&Analyzed:09/06/01 <br /> Surrogate:a,a,a-Tri�luorwoluene 0.00208 ppmv 0.00200 104 60-140 <br /> IIEF—eq;joia 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 8 of 9 <br />