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SEQUOIA ANALYTICAL <br /> 680 Chesapeake DriveRedwood City, <br /> (415) 364-9600 FAX(415)364-9233 <br /> IS VAW <br /> RESNA Client Project ID 150070 01, Chase Chevrolet <br /> 1710 Main Street Matrix Water <br /> Escalon, CA 95320 <br /> 'Attention Greg Stahl QC Sample Group 4B78302-6 Reported Feb 22, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8= <br /> Analyst: J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD <br /> Batch#: 4B84502 4884502 4884502 4884502 <br /> Date Prepared, - - - - <br /> Date Analyzed: 2/16/94 2/16/94 2/16/94 2/16/94 <br /> Instrument I D.#: GCHP-3 GCHP-3 GCHP-3 GCHP-3 <br /> Conc Spiked. 10pg/L 10,ug/L 10ug/L 30pg/L <br /> Matrix Spike <br /> . %Recovery: 100 100 100 103 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 1100 100 100 103 <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 /> �$EQUQIA 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 fall within specified control limits due to matrix <br /> U interference,the LCS recovery is to be used to validate the batch <br /> Vickie Tague <br /> Project Manager 4878301 wAT <3> <br />