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Seq �oia 8S9 Striker Avenue,Suite S <br /> l.[ [.� Sacramento,CA 95834 <br /> (916)921-9600 <br /> al <br /> ��� FAX(916)921-0100 <br /> Y wvuw.sequoiala5s.com <br /> Delta Environmental Consultants(Cameron Park) Project: ARCO 548,Stockton,CA <br /> 3330 Cameron Park Dr.Ste 550 ProjectNumber: 548,Stockton,CA Reported: <br /> Cameron Park CA, 95682 Project Manager: Steve Carter 01/18/0210:19 <br /> Total Purgeable Hydrocarbons, 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 L(mit Notes <br /> Batch 2010293-EPA 5030B (PIT) <br /> Blank(2010193-BLK1) _ Prepared&Analyzed:01/11/02 <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 tert-butyl ether ND 0.50 " <br /> Surrogate:a,a,a-7'rii luorotoluene 1.74 2.00 87.0 60-140 <br /> LCS(2010193-1351) Prepared&Analyzed: 01/11/02 <br /> Benzene 1.85 0.050 mg/m3 Air 2.00 92"5 70-130 <br /> uene 1.94 0.050 11 2.00 97.0 70-130 <br /> ylbenzene 1.98 0.050 2.00 99.0 70-130 <br /> Xylenes(total) 5.52 0.050 6.00 92.0 70-130 <br /> Methyl tert-butyl ether 2.05 0.50 2"00 102 70-130 <br /> Surrogate:a,a,a-Trifluorotoluene 1.97 2.00 98.5 60-140 <br /> LCS Dup(2010193-BSD1) _ Prepared&Analyzed: 01/11/02 <br /> Benzene 1.77 U50 mg/m'Air 2"00 88.5 70-130 4.42 25 <br /> Toluene 1.89 0.050 2.00 94.5 70-I30 2.61 25 <br /> Ethylbenzene 1.89 0"050 2"00 94.5 70-130 4.65 25 <br /> Xylenes(total)- 5.37 0.050 6.00 89.5 70-130 2.75 25 <br /> Methyl tort-buty3 ether 1.98 0.50 2.00 99.0 70-130 3.47 25 <br /> Surrogate:a,a,a-TriJluorotoluene 1.68 2.00 84.0 60-140 <br /> Aak <br /> equola Analytical-SacIamento 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 entirely. <br /> Page 4 of 6 <br />