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j SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive - Redwood City, CA 94063 <br /> ONO (415) 364-9600 - FAX (415) 364-9233 <br /> Blaine Tech Services, Inc Client Project ID Shell, 620 West Charter Way <br /> 985 Timothy Drive Matrix Liquid <br /> San Jose, CA 95133 <br /> Attention Jim Keller QC Sample Group 4BA1301-04, 06, 08, 09, 11, 12, 13 Reported Feb 24, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method. EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst' J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD <br /> Batch# 4684501 4884501 4884501 4B84501 <br /> Date Prepared - - <br /> Date Analyzed 2/17/94 2/17/94 2/17/94 2/17/94 <br /> Instrument I D # GCHP-2 GCHP 2 GCHP 2 GCHP 2 <br /> Conc Spiked 10,ug/L 10pg/L 10jug/L 30/ig/L <br /> Matrix Sprite <br /> % Recovery 94 95 95 93 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 98 99 100 100 <br /> Relative % <br /> Difference 42 41 51 73 <br /> LCS Batch# - - - <br /> Date Prepared <br /> Date Analyzed- <br /> Instrument I D # <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 /> t 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 /> interference the LCS recovery is to be used to validate the batch <br /> Suzanne Chin <br /> Project Manager 4BA1301 BLA <4> <br />