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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, 6131 Pacific, Stockton <br /> 985 Timothy Drive Matrix Water <br /> San Jose, CA 95133 <br /> Attention Jim Keller CC Sample Group 3HE1401-06 Reported Sep 7, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst M Nipp M Nipp M Nipp M Nipp <br /> Conc Spiked 10 10 10 30 <br /> Units pg/L pg/L pg/L pg/L <br /> LCS Batch# BLK090193 BLK090193 BLK090193 BLK090193 <br /> Date Prepared - - - - <br /> Date Analyzed 9/1/93 9/1/93 9/1/93 9/1/93 <br /> Instrument I D # GCHP-3 GCHP-3 GCHP 3 GCHP-3 <br /> LCS % <br /> Recovery 99 98 97 100 <br /> Control Limits 80-120 80-120 80-120 80-120 <br /> MS/MSD <br /> Batch# 3HE3404 3HE3404 3HE3404 3HE3404 <br /> Date Prepared - - - - <br /> Date Analyzed 9/1/93 9/1/93 9/1/93 9/1/93 <br /> Instrument I D # GCHP 3 GCHP 3 GCHP 3 GCHP-3 <br /> Matrix Spike <br /> %Recovery 99 100 99 100 <br /> Matrix Spike <br /> D uIn.11cate*/-- <br /> Recovery 100 100 100 100 <br /> Relative % <br /> Difference 1 0 0 0 10 00 <br /> SEWO NALYTICAL Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents, <br /> preparation and analytical methods empioyed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matrix effects the OC limits for MS/MSDs are advisory only <br /> dare not used to accept or reject batch results <br /> e9Jy,A A r <br /> Project M n er 3HE1401 BLA <2> <br />