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680 Chesapeake Dnve Red,,ood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <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 5/11/98 <br /> 9912 Business Park Drive,Ste 100 Project Number N/A Received 5/11/98 <br /> Sacramento,CA 95827 Project Manager Rusty Benkosky Reported 5/13,5/27198 <br /> Volatile Organic Compounds by EPA Method 8260A/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 /> Batch, 8050246 Date Prepared. 5/19/98 Extraction Method. EPA 5030E IP/Tl <br /> Blank 8050246-BLKI <br /> Ethanol 5/19/98 ND mg/kg 150 <br /> Tert-butyl alcohol " ND 100 <br /> Methyl tert-butyl ether " ND 0100 <br /> Di-isopropyl ether ND 0 100 <br /> Ethyl tert-butyl ether ND 0100 <br /> Tert-amyl methyl ether ND 0 100 <br /> Surrogate 1,2-DCA-d4 " 150 3 05 600-140 122 <br /> US 8050246-BSI <br /> Methyl tert-butyl ether 5/19/98 250 222 mg/kg 700-130 888 <br /> Surrogate 1 2-DCA-d4 11150 3 03 " 600-140 121 <br /> atrix Spike 8050246-MS1 5805057-01 <br /> t /tert-butyl ether 5/19/98 250 ND 270 mg/kg 600-140 108 <br /> -75'urrogate 12-DCA-d4 " 250 266 " 600-140 106 <br /> Matrix Spike Dup $050246-MSD__1 5805057-01 <br /> Methyl tent-butyl ether 5/19198 250 ND 1 89 mg/kg 600-140 756 25 0 353 4 <br /> Surrogate 1 2-DCA-d4 250 3 03 600-140 111 <br /> eq <br /> uoia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> �b <br /> Linda C Schneider, Laboratory Director Page 9 of 10 <br /> r9z� <br />