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— -- r <br /> (r tr <br /> Sequoia 819 Striker Avenue Suite 8 <br /> Sacramento CA 9$834 <br /> FAX(916)921-0100 <br /> IWO Analytical www seguoWabs nom <br /> SECOR International-Rancho Cordova Project ARCO 2093,Tracy,CA <br /> 3017 Kilgore Road, Suite 100 Project Number N/A �Rcporlcd <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 06/05/01 15 09 <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE in Air 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 I imtt Notcs <br /> Batch 1050309- EPA 50308(P/T) <br /> Blank(1050309-BLKI) _ Prepared&Analyzed 05/23/01 <br /> Purgeable Hydrocarbons ND 10 mg/ml Air <br /> Benzene ND 0 050 " <br /> Toluene ND 0 050 " <br /> Ethylbenzene ND 0 050 " <br /> Xylenes(total) ND 0 050 <br /> Methyl tert-butyl ether ND 050 " <br /> $urragate a a a-Triuoroioluene 166 2 00 830 60-140 <br /> LCS(I050309-BS1) Prepared&Analyzed 05/23/01 <br /> Benzene 1 76 0 050 rng/m'Air 200 880 70-130 <br /> Toluene 194 0 050 200 _- 970 70-130 <br /> Ethylbenzene 205 0 050 200 102 70-130 <br /> Xylenes(total) 527 0 050 600 87 8 70-130 <br /> Methyl tert-butyl ether 1 81 050 200 905 70-130 <br /> Surrogate a a a-TriJluorotoluene 107 200 104 60-140 <br /> LCS Dup(1050309-BSD1) - - - - - - - -- Prepared&Analyzed 05/23/01— <br /> Benzene 1 76 0 050 mg/ml Air 200 880 70-130 000 25 <br /> ---Toluene_ - TT _ _T-1 92 — O 050 —" 2 00—— -- 96 070-130`-`1 04 25--- - - - <br /> Ethylbenzene 208 0 050 2 00 104 70-130 145 25 <br /> Xylenes(total) -_ - - -- --s - -5 28_ -0 050 -T 6 00 - --880- 70-113C -0190-- -25---- <br /> Methyl <br /> 5 -Methyl tett-butyl ether 200 050 200 100 70-130 997 25 <br /> Surrogate a a a-Triuorotoluene 197 200 98-5 60-140 <br /> Sequoia Analytical -Sacramento The results in this report apply to the samples analyzed in accordance with the chat <br /> custody document This analytical report must be reproduced in as entirety <br /> Page 5 of 8 <br />