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Sequoia 819 Stryker Avenue,Suite 8 <br /> Sacramento CA 95834 <br /> 4i)— (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www sequoialabs corn <br /> SECOR International-Rancho Cordova Project 'POSCO 11192,Stockton,CA <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Protect Manager Rusty Benkosky 01/02/02 16 41 <br /> Total Purgeable Hydrocarbons,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 Limit Notes <br /> Batch 1120087-EPA 5030B PIT <br /> Blank 1120087-BLK1 Prepared&Analyzed 12/04/01 <br /> Purgeable Hydrocarbons ND 10 mg/m'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 0 50 " <br /> Surrogate a,a a-Trtfluorotoluene 196 200 98 0 60-140 <br /> LCS 1120087-BSI) Prepared&Anal zed 12/04/01 <br /> Benzene 1 84 0 050 mg/m'Air 200 92 0 70-130 <br /> Toluene 1 91 0 050 200 95 5 70-130 <br /> Ethylbenzene 1 94 0 050 200 970 70-130 <br /> xylenes(total) 530 0 050 „ 600 88 3 70-130 <br /> ethyl tort-butyl ether 2 14 0 50 200 107 70-130 <br /> Surrogate a a a-Trifluorotoluene 1 95 2 00 975 60-140 <br /> LCS Dup(1120087-BSD1) _ Prepared&Analyzed 12/04/01 _ <br /> Benzene 1 96 0 050 mg/m'Au 200 98 0 70-130 632 25 <br /> Toluene 2 03 0 050 200 102 70-130 6 09 25 <br /> Ethylbenzene 207 0 050 2 00 104 70-130 648 25 <br /> Xylenes(total) 5 72 0 050 600 95 3 70-130 762 25 <br /> Methyl tert-butyl ether 2 29 050 200 114 70-130 677 25 <br /> Surrogate a a a-Trifluorotoluene 2 00 200 100 60-140 <br /> quota Analytical-Sacramento The results to t�do,..entTh,. <br /> the sam�,�po,t <br /> yzed to accordance with the chain <br /> of custodanalyticamustbe reproduced to its entirety <br /> Page Page 6 of 10 <br />