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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> VAWP (415) 364-9600 FAX(415) 364-9233 <br /> Blaine Tech Services, Inc Client Project ID Shell, 4445 N Pershing Ave Stockton <br /> 1 9 <br /> 985 Timothy Drive Matrix Water <br /> San Jose, CA 95133 <br /> Attention Glen Bennett CC Sample Group 3DD9101-06 Reported May 5, 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 ug/L u9/L ug/L ps/L <br /> LCS Batch# GBLK050393 GBLK050393 GBLK050393 GBLK050393 <br /> Date Prepared N/A N/A N/A N/A <br /> Date Analyzed 5/3/93 5/3/93 5/3/93 5/3/93 <br /> Instrument I D # GCHP 3 GCHP-3 GCHP-3 GCHP-3 <br /> i� LCS % <br /> Recovery 97 97 97 97 <br /> Control Limits 80-120 80-120 80-420 80-120 <br /> MS/MSD <br /> Batch#- G3DC6401 G3DC6401 G3DC6401 G3DC6401 <br /> Date Prepared N/A N/A N/A N/A <br /> Date Analyzed: 5/3/93 5/3/93 5/3/93 5/3/93 <br /> Instrument I.D #- GCHP-3 GCHP-3 GCHP-3 GCHP-3 <br /> Matrix Spike <br /> % Recovery 100 100 100 100 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 99 100 100 too <br /> Relative% <br /> Difference 10 00 00 00 <br /> SEQUOIA ANALYTICAL 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 employed for the samples The LCS%recovery data is used for <br /> / Z validation of sample batch results Due to matrix effects the QC limits for MS/MSD s are advisory only <br /> � <br /> (( f, and are not used to accept or reject batch results <br /> M'ria'Le® <br /> Frolect Man�Sger 3DO9101 BLA <2> <br />