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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento C95834 <br /> {9 16}922 I-9600 <br /> 4 FAX(916)921-0100 <br /> Analytical -ww sequoialabs com <br /> SECOR International-Rancho Cordova Project ARCO 2133, Stockton,CA Sampled 4/26/00 <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Received 4/27100 <br /> Rancho Cordova,CA 95670 Project Manager Rusty Benkosky Reported 5110/00 <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 /> Analyte Analyzed Level Result Result Units Recov Limits % Limit % Notes* <br /> Batch 0050021 Date Prepared 4128100 Extraction Method EPA 5030E(P/T) <br /> Blank 0050021-BLK1 <br /> Purgeable Hydrocarbons 4/28100 ND mg/m'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-Tris luorotoluene 200 186 600-140 930 <br /> LCS 0050021-BSI <br /> Benzene 4/28/00 200 191 mg/ml Air 700-130 955 <br /> Toluene 200 1 95 700-130 975 <br /> Ethylbenzene 200 1 94 700-130 970 <br /> *tert-butyl <br /> (total) 6 00 573 700-130 955 <br /> ether _ 200 191 700-130 955 <br /> Surrogate a a a-Trifluorotoluene 2 00 184 600-140 920 <br /> LCS Dui) 0050021-BSD1 <br /> Benzene 4128100 200 1 93 mglm'Air 700-130 965 25 0 104 <br /> Toluene 200 196 700-130 98 0 250 0 512 <br /> Ethylbenzene 200 I 93 700-130 965 25 0 0 517 <br /> Xylenes(total) 600 570 700-130 95 0 25 0 0 525 <br /> Methyl tert-butyl ether 200 1 92 700-130 960 250 0 522 <br /> Surrogate a,a a-Trrfluorotoluene 2 00 191 600-140 95 5 <br /> Sequoia Analytical-Sacramento 'Refer to end of report for test of notes and definitions <br /> Page 4 of 6 <br />