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a- ) 819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95634 <br /> (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www.sequoialabs.com <br /> Delta Environmental Consultants{Cameron Park) Project: Arco 6100,Tracy,CA <br /> 3330 Cameron Park Dr.Ste 550 Project Number. N/A Reported: <br /> Cameron Park CA,95682 Project Manager: Jay Johnson 04/20!01 11:31 <br /> Total Purgeable Hydrocarbons and BTEX by DHS LUFT-Quality Control <br /> Sequoia Analytical-Sacramento <br /> Reporting Spike Source %REC RPB <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1090121-EPA 5030E(MeOH) <br /> Blank(1090121-BLKI) Prepared&Analyzed:09/11/01 <br /> Purgeable Hydrocarbons ND 5.0 mg/kg <br /> Benzene ND 0,025 " <br /> Toluene ND 0.025 " <br /> Ethylbenzene ND 0.025 " <br /> Xylenes(total) ND 0.025 " <br /> Surrogate:a,a,a-Trifluorotoluene 1.09 1.00 109 60-140 <br /> LCS(1090221-BSI) Prepared&Analyzed:09/11/01 <br /> Benzene 1.02 0.025 mg/kg 1.00 102 70-130 <br /> Toluene 1.03 0.025 1.00 103 70-130 <br /> Ethylbenzene 0.999 0.025 1.00 99.9 70-130 <br /> Xylenes(total) 2.79 0.025 3.00 93.0 70-130 <br /> Surrogate:a,a,a-Trifluorololuene 1.11 1.00 111 60-140 <br /> k' wMatrix Spike(1090121-MS1) Source:5109103-04 Prepared&Analyzed:09/11/01 <br /> Benzene 0.873 0.025 mglkg 1.00 ND 87.3 60-140 <br /> Toluene 0.905 0.025 1.00 ND 89.8 60-140 <br /> Ethylbenzene 0.885 0.025 1.00 ND 88.5 60-140 <br /> Xylenes(total) 2.47 0.025 3.00 ND 81.9 60-140 <br /> Surrogate:a,a,a-Trifluorotoluene 1.25 IF 1.00 115 60-140 <br /> Matrix Spike Duj2(1090121-MSDI) Source: 5109103-04 Prepared&Analyzed:09/11/01 <br /> Benzene 0.887 0.025 mg/kg 1.00 ND 88.7 60-140 1.59 25 <br /> Toluene 0.911 0.025 1.00 ND 90.4 60-140 0.661 25 <br /> Ethylbenzene 0.894 0.025 1.00 ND 89.4 60-140 1.01 25 <br /> Xylenes(total) 2.50 0.025 3.00 ND 82.9 60-140 1.21 25 <br /> Surrogate:a,a,a-Trifluorotoluene 1.23 1.00 123 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> r of custody document. This analytical report must be reproduced in its entirety. <br /> Page Page 18 of 24 <br />