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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, Inc Client Project ID Shell 4445 Pershing Avenue <br /> 985 Timothy Drive Matrix Water <br /> San Jose, CA 95133 <br /> Attention Jim Keller OC Sample Group 4BA1601-07 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 Minkei J Minkel J Minkel Minkel <br /> MS/MSD <br /> Batch# 4BA13C6 4BA1306 4BA1306 4BA1305 <br /> Date Prepared <br /> Date Analyzed 2/18 94 2/18/94 2/18/94 2118/94 <br /> Instrument 1 D # GCt-P 2 GCHP 2 GCHP 2 GCHP 2 <br /> Conc Spiked 10ug L 10pg/L 10,ug/L 3Dug/L <br /> Matrix Spike <br />. % Recovery 1010 100 100 103 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery =9 100 100 100 <br /> Relative % <br /> Difference 00 00 30 <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 riterferent free matrix that is analyzed using the same reagents <br /> SEC IA ANALYTICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known auantities of specific compounds and subjected to the entire analytical procedure if <br /> the recovery of anaiyles from the matrix soike 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 4BA1601 BLA <3> <br />