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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento, CA 95834 <br /> (916)921-9600 <br /> Analy�lca1 wv.FAX(9q6 )921-0100 <br /> 'w.se uaialabs.com <br /> Delta Environmental Consultants(Cameron Park) Project: ARCO 548,Stockton,CA <br /> 3330 Cameron Park Dr, Ste 550 Project Number: 548,Stockton,CA Reported: <br /> Cameron Park CA,95682 Project Manager: Steve Carter 03/31/02 13:27 <br /> Total Purgeable Hydrocarbons, BTEX and MTBE in Air by DHS LUFT- Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %RFC RPD <br /> AIY� Result Limit units Level Result %REC Limits RPD Limit Notes <br /> Batch 2030064-EPA 5030B /T <br /> Blank(2030064-BLKI) Prepared &Analyzed:03/05/02 <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 tent-butyl ether ND 0.50 " <br /> Surrogate-a,a,a-Triffuorotaluene 2.03 2.00 102 60-140 <br /> LCS(2030064-BSI) Prepared&Analyzed: 03/05/02 _ <br /> Benzene 1.85 0.050 mg/n-?Air. 2.00 92.5 70-130 <br /> ]uene 1.98 0.050 "• 2.00 99.0 70-130 ' <br /> ylbenzene 2.02 0.050 2.00 101 70-130 <br /> ylenes(total) 5.84 0.050 6.00 97.3 70-130 <br /> Methyl tert-butyl ether 1.94 0.50 2.00 97.0 70-130 <br /> Surrogate:a,a,o-Trifluorotoluene 2.14 2.00 107 60-140 <br /> LCS Dnp(2030064-BSD1) _ Prepared&Analyzed: 03/05/02 <br /> Benzene 1.73 0.050 mg/m'.Air 2.00 86.5 70-130 6.70 25 <br /> Toluene 1.79 0.050 2.00 89.5 70-130 30.1 25 <br /> Ethylbenzene 1.86 0.050 2.00 93.0 70-130 8.25 25 <br /> Xylenes(total) 5.36 0.050 6.00 89.3 70-130 8.57 25 <br /> Methyl tert-butyl ether 2.19 0.50 2.00 110 70-130 12.1 25 <br /> Surrogate:a,a,a-Trifluorotoluene 1.92 2.00 96.0 60-140 <br /> quoia 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 4 of 6 <br />