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404 N.Wiget Lane <br /> Sequoia Walnut Creek,CA 94598 <br /> (925)988-9600 <br /> ,!D-% Analytical FAX(925)988-9673 <br /> Pinnacle/IT Project: Arco <br /> 2201 Broadway Suite 101 Project Number: Arco#6080,Lathrop Reported: <br /> Oakland CA,94612 Project Manager: Joel Coffman 14-Sep-99 10:28 <br /> Total Purgeable Hydrocarbons (C6-C12) and BTEX by DHS LUFT Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source /AREC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 9I09016: Prepared 09-Sep-99 Using EPA 5030B[MeOH] <br /> Blank(9I09016-BLKI) <br /> Purgeable Hydrocarbons ND 1.0 mg/kg <br /> Benzene ND 0.0050 " <br /> Toluene ND 0.0050 " <br /> Ethylbenzene ND 0.0050 " <br /> Xylenes(total) ND 0.0050 " <br /> Surrogate:a,a,a-TriJluorotoluene 0.580 0.600 96.7 40-140 <br /> LCS(9I09016-BS1) <br /> Benzene 0.898 0.0050 mg/kg 0.800 112 50-150 <br /> Toluene 0.902 0.0050 0.800 113 50-150 <br /> Ethylbenzene 0.904 0.0050 0.800 113 50-150 <br /> Xylenes(total) 2.78 0.0050 2.40 116 50-150 <br /> Surrogate:a,a,a-Trifluorotoluene 0.440 0.600 73.3 40-140 <br /> Matrix Spike(9I09016-MS1) Source: W909150-08 <br /> Benzene 0.940 0.0050 mg/kg 0.800 ND 117 50-150 <br /> Toluene 0.938 0.0050 0.800 ND 117 50-150 <br /> Ethylbenzene 0.936 0.0050 0.800 ND 117 50-150 <br /> Xylenes(total) 2.86 0.0050 2.40 ND 119 50-150 <br /> Surrogate:a,a,a-Mfluorotoluene 0.666 0.600 111 40-140 <br /> Matrix Spike Dup(9I09016-MSDI) Source:W909150-08 <br /> Benzene 0.934 0.0050 mg/kg 0.800 ND 117 50-150 0.640 20 <br /> Toluene 0.936 0.0050 0.800 ND 117 50-150 0.213 20 <br /> Ethylbenzene 0.940 0.0050 0.800 ND 117 50-150 0.426 20 <br /> Xylenes(total) 2.88 0.0050 2.40 ND 120 50-150 0.697 20 <br /> Surrogate:a,a,a-Trifluorotoluene 0.600 0.600 100 40.140 <br /> Sequoia Analytical-Walnut Creek The results in this report apply to the samples analyzed i n accordance with the chain of <br /> custody document.This analytical report must be reproduced in its entirety. <br /> Dimple h<u-tna,Pmject Manager Page 8 of 10 <br />