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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N.Wiget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(92 5)988-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd.North,Ste.D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Pinnacle-C.P. Project: ARCO,5469,Stockton CA Sampled: 2/17/99 <br /> 3939 Cambridge Road,Ste.220 Project Number: N/A Received: 2/17/99 <br /> Cameron Park,CA 95682 Project Manager: Mark Capps Reported: 2/25,3/3/99 <br /> Total Purgeable Hydrocarbons(C6-C12) and BTEX by DHS LUFT/Quality Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov. Limits % Limit % Notes* <br /> LCS(continued) 9020246-BSI <br /> Ethylbenzene 2/19/99 0.200 0.196 mg/kg 70.0-130 98.0 <br /> Xylenes(total) „ 0.600 0.587 70.0-130 97.8 <br /> Surrogate: a,a,a-Trifluorotoluene 11 0.200 0.181 60.0-140 90.5 <br /> Matrix Spike 9020246-MSI S202236-01 <br /> Benzene 2/19/99 0.200 ND /k 0.160 mg/kg g 60.0-140 80.0 <br /> 0.200 ND 0.163 60.0-140 81.5 <br /> Ethylbenzene 0.200 ND 0.166 60.0-140 83.0 <br /> Xylenes(total) 0.600 ND 0.504 60.0-140 84.0 <br /> Surrogate: is l <br /> a,a,a-Truorotoluene 0.200 0.187 60.0-140 93.5 <br /> Matrix Spike Dup 902024_6-MSD1 S902236-01 <br /> Benzene 2/19/99 0.200 ND 0.161 mg/kg 60.0-140 80.5 25.0 0.623 <br /> Toluene 0.200 ND 0.158 1. 60.0-140 79.0 25.0 3.12 <br /> Ethylbenzene 0.200 ND 0.166 60.0-140 83.0 25.0 0 <br /> Xylenes(total) 0.600 ND 0.501 60.0-140 83.5 25.0 0.597 <br /> Surrogate.- a,a,a-Tris luorotoluene 0.200 0.187 60.0-140 93.5 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Ronald W. Bobel,Client Services Reprdsentative <br /> Page 6 of 9 <br />