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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, 420 Kettleman, Lodi <br /> 985 Timothy Drive Matrix Water <br /> San.lose, CA 95133 <br /> Attention Jam Keller OC Sample Group 3KE5101-06 Reported Dec 8, 1993 <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 MC MC MC MC <br /> MS/MSD <br /> Batch#, 3120015 3120015 3120015 3120015 <br /> Date Prepared 12/1/93 12/1/93 12/1/93 12/1/93 <br /> Date Analyzed 12/1/93 12/1/93 12/1/93 12/1/93 <br /> Instrument I D # GCHP-2 GCHP 2 GCHP 2 GCHP-2 <br /> Conc Spiked 10 ug/L 10 ug/L 10 u9/L 30 ug/L <br /> Matrix Spike <br /> % Recovery 98 99 97 97 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 100 110 100 107 <br /> Relative% <br /> Difference 2 0 11 3 0 98 <br /> LCS Batch# LCS120193 LCS120193 LCS120193 LCS120193 <br /> Date Prepared 12/1/93 12/1/93 2/1/93 12/1/93 <br /> Date Ana iyzed 1211/93 12/1/93 12/1/93 12/1/93 <br /> Instrument 10 # GCHP 2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery 103 109 105 106 <br /> 0%Recovery <br /> Control Limrts 80-120 80-120 80-120 80-120 <br /> Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> SEC 001A ANALYTICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> j fortified with known quantities of soecific compounds and subjected to the entire analytical procedure if <br /> ! f 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 /> ,.P ' /g A�Penne <br /> Project Manager 3KE5101 BL4 <2> <br />