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Sequoia 819 Straker Avenue,Suite$ <br /> 958 <br /> Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical w1AX(916)921-0 100 <br /> ww.sequoialabs.com <br /> Delta Environmental Consultants(Cameron Park) Project: ARCO 548,Stockton,CA <br /> 3330 Cameron Park Dr. Project Number: NIA Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 01/25101 16:15 <br /> Total Purgeable Hydrocarbons (C&C12), BTEX and MTBE in Air by DHS LUFT - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPP <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1010253-EPA 5030B (PIT) <br /> Blank(1010253-BLK1) Prepared&Analyzed:01/24%01 <br /> Purgeable Hydrocarbons ND 10.0 mg/m'Air <br /> Benzene ND 0.0500 " <br /> Toluene ND 0.0500 " <br /> Ethylbenzene ND 0.0500 " <br /> Xylenes(total) ND 0.0500 " <br /> Methyl tert-butyl ether ND 0.500 " <br /> Surrogate:a,a,a-Trifluorotoluene 2.06 1.00 103 60-140 - <br /> LCS(1010253-BS1) - Prepared&Analyzed: 01/24/01 <br /> Benzene 1.78 0.0500 mg/m'Air 2.00 89.0 70-130 <br /> Toluene 1.86. 0.0500 2.00 93.0 70-130 <br /> Ol[benzene 1.95 0.0500 2.00 97.5 70-130 <br /> enes(total) 5.05 0.0500 6.00 84.2 70-130 <br /> Methyl tert-butyl ether 1.78 0.500 2.00 89.0 70-130 <br /> Surrogate:tr,a,a-Trifluorotoluene 2.22 2.00 111 60-140 <br /> LCS Dup(1010253-BSD]) - - Prepared&Analyzed: 01/2410.1 <br /> Benzene 1.83 0.0500 mg/ml Air 2.00 91.5 70-130 2.77 25 <br /> Toluene 1.91 0.0500 2.00 95.5 70-130 2.65 25 <br /> Ethylbenzene 1.99 0.0500 2.00 99.5 70-130 2.03 25 <br /> Xylenes(total) 5.14 0.0500 6.00 85.7 70-130 1.77 25 <br /> Methyl tert-butyl ether 1.90 0.500 2.00 95.0 70-130 6.52 25 <br /> Surrogate,a,o,cr-Trifluorotoluene 1,90 2.00 95.0 60-140 <br /> uoia 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 he reproduced in its entirety. <br /> Page 4 of 6 <br />