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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive - Redwood City, CA 94063 <br /> (415) 364-9600 • FAX(415) 364-9233 <br /> RESNA y Client Project ID 150070 01, Chase Chevrolet <br /> 1710 Main Street Matrix Water <br /> Escalon, CA 95320 <br /> Attention Greg StahlReported Feb 22, 1994 <br /> QC Sample Group 4678301 <br /> 4 >wsa <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA Bolo <br /> Anal st J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD <br /> Batch#: 4B74203 4B74203 4B74203 4B74203 <br /> Date Prepared: - - - - <br /> Date Analyzed: 2/15/94 2/15/94 2/15/94 2/15/94 <br /> Instrument I D.#: GCHP-3 GCHP-3 GCHP-3 GCHP-3 <br /> Conc Spiked- long/L long/L 10pg/L 30pg/L <br /> Matrix Spike <br /> %Recovery- 98 98 99 100 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 98 97 98 100 <br /> Relative% <br /> Difference 00 10 10 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 /> SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> J fortrfied 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 limits due to matrix IX— <br /> f 1 interference,the LCS recovery is to be used to validate the batch <br /> Vickie Tagu <br /> Project Manager 4B78301 WAT <2> <br />