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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX(415) 364-9233 <br /> Blaine Tech Services, Incl Client Project ID Shell, 620 West Charter Way <br /> 985 Timothy Drive Matrix Liquid <br /> San Jose, CA 95133 <br /> Attention Jim Keller OC Sample Group 4BA1305 Reported Feb 24, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8024 EPA 8020 EPA 8020 EPA 8020 <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 10pg/L 10yg/L 14ug/L 30Pg/L <br /> Matrix Spike <br /> % Recovery 86 85 85 87 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 100 99 140 100 <br /> Relative % <br /> Difference 15 15 16 14 <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 /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> i 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 BILA <5> <br />