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SEQUOIA ANALYTICAL <br /> 6110 Chesapeake Drive • Redwood City, CA 94063 <br /> (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 CC Sample Group 4BA1310 Reported Feb 24, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method: EPA 6020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD <br /> Batch# 4896607 4696607 4896607 4696607 <br /> Date Prepared - - <br /> Date Analyzed 2/19/94 2/19/94 2/19/94 2/19/94 <br /> Instrument I D # GCHP-17 GCHP 17 GCHP 17 GCHP-17 <br /> Conc Spiked 10pg/L 10pg/L lopg/L 3opg/L <br /> Matrix Spike <br /> OR % Recovery 110 110 110 107 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 110 110 110 110 <br /> Relative % <br /> Difference 00 00 00 28 <br /> LCS Batch# - - <br /> Date Prepared - <br /> Date Analyzed <br /> Instrument 1 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 /> SECT! A 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 /> 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 <7> <br />