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Sequoia 819 acra ento,Avenue,Suite 8 <br /> Sacramento,CA 95834 <br /> (916)921-9600 <br /> FAX(916)921-0100 <br /> Analytical <br /> wwwsequoialabs.corn <br /> Delta Environmental Consultants(Cameron Park) Project: ARCO 548, Stockton,CA <br /> 3330 Cameron Park Dr.Ste 550 Project Number: N/A Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 08/20/01 13:07 <br /> Total Purgeable Hydrocarbons, BTEX and MTBE in Air by DHS LUFT - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source "/oRHC RPD <br /> Analyte Result limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 10801.20-EPA 5030B (PIT) <br /> Blank(1080120-BLKI) Prepared:08/07/01 Analyzed: 08/08/01 <br /> Purgeable Hydrocarbons NO 10 mg/ml Air <br /> Benzene ND 0.050 " <br /> Toluene NO 0.050 " <br /> Ethylbenzene NO 0.050 " <br /> Xylenes(total) NO 0.050 " <br /> Methyl tert-butyl ether NO 0.50 " <br /> Surrogate:a,a,a-Trj?uorotoluene 2.19 2.00 110 60-140 <br /> LCS(1080120-BSI)_ Prepared:08/07/01 Analyzed: 08/08/01 _ <br /> Benzene 2.19 0.050 mg/ml Air 2.00 110 70-130 <br /> WIbenzene <br /> ne2.03 0.050 2.00 102 70-130 1.99 0.050 2.00 99.5 70-130 <br /> Xylenes(total) 6.09 0.050 6.00 102 70-130 <br /> Methyl tert-butyl ether 1.91 0.50 2.00 95.5 70-130 <br /> Surrogate:a,a,a-Triiluorotoluene 2.41 - 2.00 120 60-140 <br /> LCS Du (1080120-BSD1) Prepared: 08/07/01 Analyzed:08/08/01 <br /> Benzene 2.31 0.050 mg/ml Air 2.00 116 70-130 5.33 25 <br /> Toluene 2.15 0.050 2.00 108 70-130 5.74 25 <br /> Ethylbenzene 2.11 0.050 2.00 106 70-130 5.85 25 <br /> Xylenes(total) 6.44 0.050 6.00 107 70-130 5.59 25 <br /> Methyl tent-butyl ether 1.96 0.50 2.00 98.0 70-130 2.58 25 <br /> Surrogate:a,a,a-Triuorotoluene 2.15 2.00 mm^ 108 60-140IIIPU <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 /> Pa,e 4.of 6 <br />