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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive - Redwood City,CA 94063 <br /> (415) 364-9600 - FAX (415)364-9233 <br /> +' 'L vJ r ♦} • % n ♦M,x n f♦ }vr •� , u J•.[•+ } w ,�.r. nryr .0 r Ji J$ <br /> • r� rcx vlA frry �}'•• +W+CiVx xi['}lmrcns n. x . n vvu `lvG vnr vu•,n n ry rnr <br /> Blaine Tech Seances, Inc vClient Project ID Shell, 141 N EI Dorado <br /> 985 Timothy Drive Matrix Liquid <br /> San Jose, CA 95133 s <br /> Attention Jim Keller QC Sample Group 4BA1407 Reported Feb 25, 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 'A.rkel J Minkel J Minkel J Minkel <br /> MS/MSD <br /> Batchi#• 4860303 4BB0303 4860303 4BB0303 <br /> Date Prepared - - <br /> Date Analyzed 2/22,94 2/22/94 2/22/94 2/22/94 <br /> Instrument I D #- GCS-P-17 GCHP-17 GCHP 17 GCHP-17 <br /> COnC. Spiked 0.g/l- 10,ug/L 10Ng/L 30yg/L <br /> • Matrix Spike <br /> % Recovery: 97 98 98 100 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery _9 99 100 100 <br /> Relative % <br /> Difference: 20 10 20 10 <br /> n . r t • i • • <br /> LCS Batch#: - - - - <br /> Date Prepared: - - - - <br /> Date Analyzed: - - - <br /> Instrument I D #: - -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 /> OEQUOIA 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 Iirnits due to matrix <br /> interference,the LCS recovery Is to be used to validate the batch <br /> Suzanne Chin <br /> Project Manager 4BA1401 SLA <Bs <br />