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819 Straker Avenue,Suite B <br /> tD, Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> iqtw Analytical FAX(916)921-0100 <br /> www sequoialabs com <br /> elta Environmental Consultants(Cameron Park) Project Arco 6100,Tracy,CA <br /> 330 Cameron Park Dr Ste 550 Project Number Arco 6100,Tracy,CA Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 01/28/02 15 54 <br /> Total Purgeable Hydrocarbons and BTEX by DHS LLTFT- 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 2010315-EPA 50308 eOH <br /> Blank(2010315-BLKl) Pre ared&Analyzed 01/24/02 <br /> Purgeable Hydrocarbons ND 5 0 mg/kg <br /> Benzene ND 0 050 " <br /> Toluene ND 0 050 " <br /> Ethylbenzene ND 0 050 " <br /> Xylenes(total) ND 0 050 " <br /> Surrogate a a a-Trtfluorotoluene 0 966 100 966 60-140 <br /> LCS 2010315-BSI) Preeared&Analyzed 01/24/02 <br /> Benzene 0 912 0 050 mg/kg 1 00 91 2 70-130 <br /> Toluene 0 963 0 050 1 00 963 70-130 <br /> Ethylbenzene 0 984 0 050 1 00 98 4 70-130 <br /> Xylenes(total) 2 80 0 050 3 00 93 3 70-130 <br /> rogare a,a a-Tr¢fluorotoluene 0 955 1 00 95 5 60-140 <br /> S Det 2010315-BSDl� Prepared&Analyzed 0]/24/02 _ <br /> Benzene 0 919 0 050 mg/kg 1 00 91 9 70-130 0 765 25 <br /> Toluene 1 07 0 050 1 00 107 70-130 10 5 25 <br /> Ethylbenzene 1 16 0 050 1 00 116 70-130 16 4 25 <br /> Xylenes(total) 3 53 0 050 3 00 118 70-130 23 1 25 <br /> Surrogate a a a-Trifluorotoluene 0 860 1 00 86 0 60-140 <br /> uola Analytical-Sacramento The results in this report apply to the samples analyzed to accordance with the chain <br /> of custody document This analytical report must be reproduced in its entirety <br /> Page Page 5 of 7 <br />