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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento C 95834 <br /> (916)922 1-9600 <br /> FAX(916)921-0 100 <br /> a- Analytical www sequoialabs com <br /> qw <br /> IT Corporation-Sacramento Project Parkinson's ARCO,Stockton Sampled 9/21/00 <br /> 1433N Market Blvd,Ste 1 Project Number 880-040 IA/O1050000 Received 9/21/00 <br /> Sacramento,CA 95834 Project Manager Kathleen Waldo Re orted 10/6/00 <br /> Volatile Oxygenate 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 /> LCS Dun(continues 0090325-BSD1 <br /> Surrogate 1,2-DCA-d4 10/4/00 500 502 ug/1 600-140 100 <br /> Matrix Spike 0090325-MSI S010045-01 <br /> Methyl tert-butyl ether 10/4/00 500 ND 494 ug/1 600-140 988 <br /> Surrogate 1,2-DCA-d4 11500 508 600-140 102 <br /> Matrix Spike Dun 0090325-MSDI 5010045-01 <br /> Methyl tert-butyl ether 10/4/00 500 ND 486 ug/1 600-140 972 250 163 <br /> Surrogate 12-DCA-d4 500 502 600-140 100 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions <br /> Page 8 of 10 <br />