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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento CA 95834 <br /> (916)92 I-9600 <br /> FAX(916)92 1-0 100 <br /> Analytical www sequoialabs`om <br /> rr <br /> SECOR International-Rancho Cordova Project ARCO 2093,Tracy,CA <br /> 3017 Kilgore Road,Suite 100 Project Number NIA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 01/31/01 17 11 <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 /> Analyte Result Limit Units Level Result %REC I[mils RPD Limit Notes <br /> Batch 1010178-EPA 5030E (PIT) <br /> Blank(1010178-BLKI) _ Prepared&Analyzed 01/19/01 <br /> Purgeable Hydrocarbons ND 2 80 ppmv <br /> Benzene ND 00160 <br /> Toluene ND 00130 " <br /> Ethylbenzene ND 00120 <br /> Xylenes(total) ND 00120 <br /> Methyl tert-butyl ether ND 0 140 <br /> Surrogate a a a-Trifluorotoluene 000200 V v 000200 100 60-140 JJ _ <br /> LCS(1010178-BSI) Prepared&Analyzed 01/19/01 <br /> Surrogate a a a-Trifluorotoluene 000199 ppmv 000200 995 60-140 <br /> up(1010178-BSDI) Prepared&Analyzed 01/19/01 <br /> Surrogate a a a-Trtfluorololuene 000205 ppmv 000200 102 60-140 <br /> AM <br /> o1a Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Thts analytical report must be reproduced in its entirety <br /> Page 6 of 8 <br />