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680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> sequoia <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX{510) 988 9673 1 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Secor International Project Unocal 8671,Stockton,CA Sampled 5111198 <br /> 9912 Business Park Drive,Ste 100 Project Number N/A Received 5/11198 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 5/13,5127198 <br /> Total Purgeable Hydrocarbons(C6-C12),BTEX and MTBE 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) 8050239-BSL <br /> Methyl tert-butyl ether 5/19/98 0200 0 171 mg/kg 700-130 85 5 <br /> Surrogate a a a-Trifluorotoluene " 0200 0203 600-140 101 <br /> Matrix Spike 8050239-MSI 5805137-06 <br /> Benzene 5119198 0200 ND 0 198 mg/kg 600-140 990 <br /> Toluene 0200 ND 0 187 600-140 93 5 <br /> Ethylbenzene 0200 ND 0 197 600-140 985 <br /> Xylenes(total) 0 600 00100 0 636 600-140 104 <br /> Methyl tert-butyl ether 0200 ND 0 183 600-140 91 5 <br /> Surrogate a a a-Trifluorotoluene 0200 0 188 600-140 940 <br /> Matrix Spike Duo 8050239-MSDI 5805137-06 <br /> Benzene 5119198 0200 ND 0 193 mg/kg 600-140 965 250 2 56 <br /> Joluene 1. 0 200 ND 0 186 600-140 93 0 25 0 0 536 <br /> iylbenzene 0200 ND 0 191 600-140 955 25 0 3 09 <br /> Xylenes(total) 0 600 00100 0 613 600-140 100 25 0 392 <br /> Methyl tent-butyl ether 0200 ND 0 179 600-140 89 5 250 221 <br /> Surrogate a a a-Trifliiorotoluene 0200 0181 600-140 905 <br /> 0- <br /> Sequo) Analytical-Sacr gent *Refer to end of report for tent of notes and definitions <br /> Page 8 of 16 <br /> Linda C Schneider, Laboratory Director <br /> r�i <br />