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Sequoia <br /> equo a 819 Striker Avenue,Suite <br /> g Sacramento,CA 958344 <br /> (916)9Z1-9600 <br /> Analytical <br /> FAX(916)92 <br /> fl�� www.sequoialabs.combs.com <br /> Delta Environmental Consultants(Cameron Park) Project: ARCO 548, Stockton,CA <br /> 3330 Cameron Park Dr. Project Number: N/A Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 03/29/01 11:40 <br /> Total Purbeable Hydrocarbons (C6-C12) and BTEX by DHS LUFT - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source °/6R-C RPD <br /> Analyte Result Limit Units Level Result %RFC Limits RPD Limit Notes <br /> Batch 1030273- EPA 5030B(PIT) <br /> Blank(1030273-BLKI) Prepared&Analyzed: 03/19/01 <br /> Purgeable Hydrocarbons ND 50.0 ugA <br /> Benzene ND 0.500 <br /> Toluene ND 0.500 " <br /> Ethylbenzene ND 0.500 " <br /> Xylenes(total) ND 0.500 " <br /> Surrogate:a,a,a-Trifluorotoluene 10.1 10.0 101 60-140 <br /> LCS(1030273-BSI) Prepared&Analyzed:03/19/01 <br /> Benzene 8.09 0.500 ug/l 10.0 80.9 70-130 <br /> Toluene 8.26 0.500 10.0 82.6 70-130 <br /> Eth ]benzene 8.54 0.500 10.0 85.4 70-130 <br /> es(total) 25.5 0.500 30.0 85.0 70-130 <br /> Surrogate:a,a,a-Trifluorotoluene 7.86 10.0 78.6 60-140 <br /> Matrix Spike(1030273-MSI) Source: S103246-03 Prepared&Analyzed:03/19/01 <br /> Benzene 8.87 0.500 ug/l 10.0 ND 88.7 60-140 <br /> Toluene 9.18 0.500 10.0 ND 91.8 60-140 <br /> Ethylbenzene 9.34 0.500 10.0 ND 93.4 60-140 <br /> Xylenes(total) 28.0 6.500 30.0 ND 93.3 60-140 <br /> Surrogate:a,a,a-Triuorotoluene 8.39 10.0 83.9 60-140 <br /> Matrix Spike Dup(1030273-MSD1) Source:S103246-03 Prepared&Analyzed:03/19/01 <br /> Benzene 9.15 0.500 ug/l 10.0 ND 91.5 60-140 3.11 25 <br /> Toluene 9.51 0.500 I0.0 ND 95.1 60-140 3.53 25 <br /> Ethylbenzene 9.67 0.500 10.0 ND 96.7 60-140 3.47 25 <br /> Xylenes(total) 29.1 0.500 30.0 ND 97.0 60-140 3.85 25 <br /> Surrogate:aAa-Trj7uorotoluene 8.94 10.0 89.4 60-140 <br /> oia 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 6 of 8 <br />