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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, 141 N El Dorado, Stockton <br /> 985 Timothy Drive Matrix Water <br /> San Jose, CA 95133 <br /> Attention Jim Keller QC Sample Group 3KE5501-10 Reported Dec 3, 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 M Nipp M Nipp M Nipp M Nipp <br /> MS/MSD <br /> Batch# 3KE6701 3KE6701 3KE6701 3KE6701 <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 /> Cone. Spiked 101ig/L 10ug/L 10ug/L 30ug/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 /> Recovery <br /> % ecovery <br /> Control Limits 55-145 47-149 47-155 56-140 <br /> Please Note <br /> The LCS is a control sample of known interferent free matrix that is anala zed using the same reagents, <br /> IWEQLLQI NALYTICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> JJ/i fortified with known quantities of specific compounds and subjected to the entue analytical procedure ff <br /> 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 /> Peggy A Penner 3KE5501 BLA <4> <br /> Project Manager <br />