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819 Striker Avenue Suite 8 <br /> l <br /> Sequoia Sacramento CA 95834 <br /> (916)921-9600 <br /> 111,E <br /> FAX Analytical alabs 00 <br /> www sequoilabs c com <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 03/01/01 15 10 <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 Lima Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1020188 - LPA 5030B(PIT) <br /> Blank(1020188-B_LK1) Prepared&Analyzed 02/15/01 _ <br /> Purgeable Hydrocarbons T ND Y WO mg/m'Air <br /> Benzene ND 00500 <br /> Toluene ND 00500 " <br /> Ethylbenzene ND 00500 " <br /> Xylenes(total) ND 00500 <br /> Methyl tent-butyl ether ND 0 500 <br /> Surrogate a a a-Triuorotoluene 184 200 92 0 60-140 <br /> LCS(1020188-BSI) Prepared&Analyzed 02/15/01 _ <br /> Benzene 172 0 0500 mg/m'Air 200 860 70-130 <br /> gone 1 78 00500 200 890 70-130 <br /> benzene 1 82 00500 200 910 70-130 <br /> Xylenes(total) 562 00500 600 93 7 70-130 <br /> Methyl tent-butyl ether 1 66 0 500 200 83 0 70-130 <br /> Surrogate a a a-Triuorotoluene 1 78 200 890 60-140 <br /> LCS Dap(1020188-BSD1) Prepared&Analyzed 02/15/01 <br /> Benzene 1 80 00500 mg/m'Air 200 900 70-130 455 25 <br /> Toluene 186 00500 200 930 70-130 440 25 <br /> Ethylbenzene 192 00500 200 960 70-130 535 25 <br /> Xylenes(total) 590 00500 600 983 70-130 486 25 <br /> Methyl text-butyl ether 168 0 500 200 940 70-130 120 25 <br /> Surrogate a a a-Triuorotoluene 186 200 930 60-140 <br /> equola 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 8 <br />