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SEQUOIA ANALYTICAL <br /> ` 680 Chesapeake Drive - Redwood City, CA 94063 <br /> (415) 364-9600 - FAX(415) 364-9233 <br /> ,.s f .,M..Y ,,.r��.x�,.-•,.,,,.,� ✓r.. , a ni v.,y k<-. . H, .v f n s �'ay+y.»i�s}y,,,�..,., < t +. <br /> Blaine Tech Services, Inc Client Project ID. Shell, 141 NXEl Dorado v .n <br /> 985 Timothy Drive Matrix Liquid <br /> San Jose, CA 95133 <br /> Attention Jim Keller QC Sample Group 4BA1401, 05, 09, 10 Reported Feb 25, 1994 ' <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method. EPA 8020 EPA 8020 EPA 8020 EPA8020 <br /> Analyst J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD <br /> Batch# 4BA1301 4BA1301 4BA1301 4BA1301 <br /> Date Prepared - - - <br /> Date Analyzed 2/18/94 2/18/94 2/18/94 2/18/94 <br /> Instrument I D # GCHP 3 GCHP 3 GCHP 3 GCHP 3 <br /> Conc Spiked 10ug/L 10ug/L 10pg/L 30ug/L <br />. Matrix Spike <br /> % Recovery 86 85 85 87 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 100 99 100 100 <br /> Relative % <br /> Difference: i5 15 16 14 <br /> LCS Batch#, - - - <br /> Date Prepared: - - - - <br /> Date Analyzed: - - - - <br /> Instrument I D #.- <br /> LCS <br /> :LCS % <br /> Recovery: - - - <br /> %Recovery <br /> Control Limits- 71-133 72-128 72-130 71-120 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL 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 till <br /> the recovery of analytes from the matrix spike does not fall within specified contrad limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Suzanne Chin <br /> Project Manager 4BA1401 BLA <3> <br />