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r <br /> 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 Ave, Stockton <br /> 985 Timothy Drive Matrix Water <br /> San Jose, CA 95133 <br /> Attention Jim Keller OC Sample Group 3KE5401-06 Reported Dec 6, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyi Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 80,,0 <br /> Analyst: M Nipp M Nipp M Nipp M Nipp <br /> MS/MSD <br /> Batch# 3KE3701 3KE3701 3KE3701 3KE3701 <br /> Date Prepared- - - <br /> Date Analyzed. 11/29/93 11/29/93 11/29/93 11/29/93 <br /> Instrument I D # GCHP 3 GCHP-3 GCHP-3 GCHP-3 <br /> Conc. Spiked 10jug/L 10ug/L 10,ug/L 30Yg/L <br /> Matrix Spike <br /> % Recovery* 96 95 95 93 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 94 92 92 93 <br /> Relative% <br /> Difference: 21 32 32 00 <br /> LCS Batch#• - - <br /> Date Prepared - <br /> Date Analyzed. <br /> Instrument i D #* <br /> LCS% <br /> Qecovery - - <br /> % Recovery <br /> Control Limits 55-145 47-149 47-155 56-140 <br /> Please Note <br /> l� The LCS is a control sample of known interferent tree matrix that is analyzed using the same reagents <br /> SEQUOIA 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 fail within specified control limits due to matrix <br /> finterference,the LCS recovery is to be used to validate the batch <br /> 'Peggy A Penner <br /> Project Manager 3KE5401 BLA <3> <br />