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SEUOIA ANALYTICAL <br /> 680 Chesapeake D e Redwood d y, CA 94063 <br /> V (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 N3pp M Nipp M Nipp <br /> MS/MSD <br /> Batch# 3KC5702 3KC5702 3KC5702 3KC5702 <br /> Date Prepared - - - <br /> Date Analyzed 11/24/93 11/24/93 11/24/93 11/24/93 <br /> Instrument I D # GCHP 17 GCHP-17 GCHP-17 GCHP-17 <br /> Conc Spiked 10ug/L 101ug/L 10yg/L 30Y9/L <br />. Matrix Spike <br /> % Recovery. 100 100 too 100 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery. 100 100 100 100 <br /> Relative% <br /> Difference 00 00 00 00 <br /> LCS Batch# - - - <br /> Date Prepared - <br /> Date Analyzed <br /> Instrument I D #- - - - <br /> 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 /> WEOU-NA'AA�ALYTICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> r fortified with known quantities of specific compounds and subjected to the entire analytical procedure 0 <br /> ofthe 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 /> ),e(3agy A Penner3KE5501 t3LA a3> <br /> Project Manager <br />