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819 Stnker Avenue Suite 8 <br /> Sequoia Sacramento C 95834 <br /> (916)922 t-9600 <br /> i!DFAX(916)921-0100 <br /> Mplfo- Analytical www sequoialabs com <br /> SECOR International-Rancho Cordova Project ARCO 2133 Stockton,CA Sampled 7/27/00 <br /> 3017 Kilgore Road,Suite 100 ProjectNumber N/A Received 7/28100 <br /> Rancho Cordova,CA 95670 Project Manager Rus Benkosky Reported 8/2/00 <br /> Total Purgeable Hydrocarbons(C6-C12), BTEX and MTBE in Air by DHS LUI T/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov RPD RPD <br /> lAnalyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Batch 0080020 Date Prepared 7/31/00 Extraction Method EPA 50306(PIT) <br /> Blank 0080020-BLKI <br /> Purgeable Hydrocarbons 7131/00 ND mg/ml Air 100 <br /> Benzene ND 00500 <br /> Toluene ND 00500 <br /> Ethylbenzene ND 00500 <br /> Xylenes(total) ND 00500 <br /> Methyl tert-butyl ether ND 0 500 <br /> Surrogate a a a-Trifluorotoluene 200 2 08 600-140 <br /> 104 <br /> LCS 0080020-BSI <br /> Benzene 7131/00 200 209 mg/m'Air 700-130 104 <br /> Toluene 200 2 21 700-130 111 <br /> JWlbenzene 200 2 14 700-130 107 <br /> enes(total) 600 603 700-130 101 <br /> Methyl tert-butyl ether 200 2 18 700-130 109 _ <br /> Surrogate a a a-Trifluorotoluene 100 2 16 600-140 108 <br /> LCS Duo 0080020-BSD1 <br /> Benzene 7131/00 200 2 13 mg/ml Air 700-130 107 25 0 284 <br /> Toluene 200 2 25 700-130 113 25 0 179 <br /> Ethylbenzene 200 221 700-130 111 250 367 <br /> Xylenes(total) 600 6 26 700-130 104 25 0 2 93 <br /> M1 t 1 tert-butyl ether 200_ _ 230 700-130 115 _ 250 536 <br /> Surrogate a,a,a-Trrfluorotoluene 200 2 18 600-140 109 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> Page 4 of 6 <br />