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r <br /> 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-%00 FAX(925)988-9673 <br /> Analytical III 5tr,kerAvenue Suite 8 Sacramento CA 95834 (916)911-9600 FAX(916)921-0100 <br /> q1W1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Wler-Ryan - Dublin Client Project Ib 'rOSCO #11193, Stockton <br /> 6747 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Doug Lee QC Sample Group 812-1494 Reported Dec 22, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes MTBE <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8260 <br /> Analyst - - - - N Nelson <br /> MS/MSD <br /> Batch# - - 8121011 <br /> Date Prepared - - 12/17/98 <br /> Date Analyzed - - 12/17/98 <br /> Instrument I D # - - GC/MS-2 <br /> Conc Spiked - 50,ug/L <br /> Matrix Spike <br /> % Recovery - - - 128 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery - - - Iso <br /> Relative % <br /> Difference- - - - 11 <br /> LCS Batch# - - - LCS121798 <br /> Date Prepared - - - 12/17/98 <br /> Date Analyzed - - - - 12/17/98 <br /> Instrument I D # - - - - GC/MS-2 <br /> LCS % <br /> Recovery _ _ _ - 126 <br /> % ecovery <br /> Control Limits - - - 70-130 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIAANALYTICAL, #1271 preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Julianne Fegley <br /> interference,the LCS recovery is to be used to validate the batch <br /> Project Manager <br /> 8121494 GET <3> <br /> 1 <br />