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Suite 8 <br /> Sequoia 819 acres entoAvenue 95834 <br /> Sacramento CA 95834 <br /> (916)921-9600 <br /> FAX(916)921-0100 <br /> Analyticalwww sequoialabs com <br /> SECOR international-Rancho Cordova Project ARCO 2133, Stockton,CA Sampled 8/31/00 <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Received 8/31/00 <br /> Rancho Cordova,CA 95670 Project Manager Rusty Benkosky Reported 9/12/00 <br /> Total Purgeable Hydrocarbons(C6-C12), BTEX and MTBE in Air by DHS LUFT/Quality Control <br /> Sequoia Analytical- Sacramento <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> IAnalyte Analyzed Level Result Result Units Recov Limits % Lima % Notes* <br /> Batch 0080366 Date Prepared 8131/00 Extraction Method EPA 5030E PIT <br /> Blank 0080366-BLKI <br /> Purgeable Hydrocarbons 8131/00 ND mg/m'Air 100 <br /> Benzene ND 00500 <br /> Toluene toND 00500 <br /> Ethylbenzene ND 00500 <br /> Xylenes(total) ND 00500 <br /> Methyl tert-butyl ether ND 0 500 <br /> Surrogate a a a-Trifluorotoluene 2 00 198 600-140 990 <br /> LCS 0080366-BSI <br /> Benzene 8/31/00 200 195 mg/m'Air 700-130 975 <br /> Toluene 200 191 700-130 955 <br /> nzene 200 1 85 700-130 925 <br /> (total) 600 507 700-130 84 5 <br /> Methyl tert-butyl ether 200 _ 228 700-130 114 <br /> Surrogate a a a-Trrlluorotoluene 200 2 09 600-140 104 <br /> LCS Dup 0080366-BSD1 <br /> Benzene 8/31100 200 191 mg/m'Air 700-130 95 5 25 0 207 <br /> Toluene to200 189 700-130 945 25 0 105 <br /> Ethylbenzene to200 181 700-130 905 250 2 19 <br /> Xylenes(total) 600 496 700-130 82 7 25 0 2 15 <br /> Methyl tett-butyl ether 200 237 700-130 118 250 345 <br /> Surrogate Aa,a-Trrfluorotoluene 200 206 600-140 103 <br /> 0 <br /> Sequoia Analytical-Sacramento 'Refer to end of report for text of notes and definitions <br /> Page 4 of 6 <br />