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Sequoia 819-Striker Avenue,Suite <br /> Sacramento,CA 958344 <br /> (916;921-9600 <br /> Analytical wFAX(9I6)921-0100 <br /> www.Sequoialzbs.com <br /> Delta Environmental Cons ultants(Camero n Park) Project: ARCO 548,Stockton,CA <br /> 3330 Cameron Park Dr. Project Number: N/A Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 02/16/01 13:50 <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE in Air (ppmv) by DHS LUFT - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> AialyL. Result Limit Units Level Result %REC Limits RPA Limit Notes <br /> Batch 1020132-EPA 5030B (P/T) <br /> Blank(1020132-BLK1) Prepared&Analyzed: 02/07/01 <br /> Purgeable Hydrocarbons ND 2.80 ppmv <br /> Benzene ND 0.0160 " <br /> Toluene ND 0.0130 " <br /> Ethylbenzene ND 0.0120 " <br /> Xylenes(total) ND 0.0120 " <br /> Methyl tert-butyl ether ND 0.140 " <br /> Surrogate:a,a,a-Trifluorololuene 0.00220 0.00200 110 60-140 <br /> • <br /> Sequoia 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 /> 5 of 6 <br />