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1 Sequoia 819 Striker Avenue Suite 8 <br /> Sacramento CA 95834 <br /> (916)921-9600 <br /> FAX(916)921-0100 <br /> Analytical www sequoialabs corn <br /> c <br /> SECOR International-Rancho Cordova Project Arco 4932,Stockton,CA <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 03/02/01 17 10 <br /> Total Purgeable Hydrocarbons (C6-C12), 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 /> aitch 1030025-EPA 5030B PIT <br /> Blank(1030025-BLK_1) Prepared&Analyzed 02/21/01 <br /> Iurgeable Hydrocarbons ND 100 mg/m'Air <br /> enzene ND 00500 <br /> Toluene ND 00500 <br /> thylbenzene ND 00500 " <br /> ylenes(total) ND 00500 " <br /> ethyl ten-butyl ether ND 0 500 " <br /> Surrogate a a a-Trifluorotoluene 2 14 T "— 2 00 107 60-140 <br /> C_ <br /> _ S_(103002_5-BSI) _ Prepared&Analyzed 02/21/01 <br /> Benzene 208 00500 mg/m'Air 200 104 70 130 <br /> Toluene 2 18 00500 200 109 70-130 <br /> zene <br /> 229 00500 200 114 70-130 <br /> s(total) <br /> 592 00500 600 987 70-130 <br /> Methyl tert-butyl ether 1 88 0 500 200 940 70-130 <br /> �urrog ase at a-Tris luoroioluene 136 200 118 60-140 <br /> i.CS DuP(1030025-ESDI) _ Prepared&Analyzed 02/21/01 <br /> (enzene 205 00500 mglm'Air 200 102 70-130 1 45 25 <br /> oluene 2 15 00500 200 108 70-130 139 25 <br /> thylbenzene 225 00500 200 113 70-130 176 25 <br /> Xylenes(total) 584 00500 600 973 70-130 1 36 25 <br /> tethyl tert-butyl ether __ 180 0 500 _„ 200 900 70-130 435 25 <br /> urrogate a a a-Trifluorotoluene 216 200 113 60-140 <br /> to Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> ' Page 5 of 9 <br />