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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical <br /> FAX 921-0100 <br /> . 1 www.w.sequequolalabs.com <br /> Delta Environmental Consultants(Cameron Park) Project: ARCO 548,Stockton,CA <br /> 3330 Cameron Park Dr. Ste 550 Project Number: 548,Stockton,CA Reported, <br /> Cameron Park CA,95682 Project Manager: Steve Carter 02/14/02 14:43 <br /> Total Purgeable Hydrocarbons, BTEX and MTBE in Air (ppmv) by DHS LUFT - 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 2020054-EPA 5030E (PIT) <br /> Blank(2020054-BLKI) Prepared&Analyzed: 02/05/02 _ <br /> Purgeable Hydrocarbons ND 2.8 ppmv <br /> Benzene ND 0.016 " <br /> Toluene ND 0.015 " <br /> Ethylbenzene ND 0.012 . " <br /> Xylenes(total) ND 0.012 " <br /> Methyl tert-butyl ether ND 0.14 " <br /> Surrogate:a,a,a-Trifluorotoluene 0.346 0.335 103 60-140 <br /> LCS(2020054-BSI) Prepared&Analyzed: 02/05/02 <br /> Surrogate:a,a,a-Trifluorotoluene 0.368 ppmv 0.335 110 60-140 <br /> "S Dup(2020054-BSD]) Prepared&Analyzed: 02/05/02 <br /> urrogate:a,a,a-Trifluorotoluene 0.371 ppmv 0.335 111 60-140 <br /> i <br /> equoia 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 5 of 6 <br />