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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www sequoialabs cwm <br /> SECOR International-Rancho Cordova Pmiect 'POSCO 11193,Stockton,CA <br /> 3017 Kilgore Road,Scute 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 12/11/01 16 42 <br /> Total Purgeable Hydrocarbons, BTEX and MTBE u1 Air by DHS LUFT- Quahty 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 1120065-EPA 5030E <br /> Blank 1120065-BLKI ared&Analyzed 11/30/01 <br /> Purgeable Hydrocarbons ND 10 mg/m3 Air <br /> Benzene ND 0 050 " <br /> Toluene ND 0 050 " <br /> Ethylbenzene ND 0 050 " <br /> Xylenes(total) ND 0 050 " <br /> Methyl tent-butyl ether ND 050 " <br /> Surrogate a a a-Trifluorotoluene 187 200 935 60-140 <br /> LCS K1120065-BSI) Pre_Qared&Analyzed 11/30/01 <br /> Benzene 1 96 0 050 mg/m3 Air- 200 990 70-130 <br /> Toluene 1 83 0 050 2 00 91 5 70-130 <br /> Ethylbenzene I 73 0 050 200 865 70-130 <br /> Mylencs(total) 5 34 0 050 600 890 70-130 <br /> ethyl tert-butyl ether 141 050 200 70 5 70-130 <br /> Surrogate a a,a-Trifluorotoluene 202 200 101 60-140 <br /> LCS Da 1120065-BSD/ Prepared&Analyzed 11/30/01 <br /> Benzene 1 94 0 050 mg/ml Air 2 00 970 70-130 1 03 25 <br /> Toluene 1 81 0 050 200 905 70-130 1 t0 25 <br /> Ethylbenzene 1 75 0 050 200 875 70-130 1 15 25 <br /> Xylenes(total) 5 35 0 050 600 892 70-130 0 187 25 <br /> Methyl tert-Butyl ether 134 050 " 200 670 70-130 509 25 Q-LIM <br /> Surrogate a a a-Trafluorotoluene 2 09 200 104 60-140 <br /> �equoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document This analytical report must be reproduced in its entirety <br /> Page Page 6 of 10 <br />