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N " Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue Suite L Concord,CA 94510 (510) 686 9600 FAX(S10)686 9669 <br /> �w117 Analytical 819 Striker Avenue Suite a Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> RESNA Client Project 1D 15007001.,Chase Chevrolet <br /> 1710 Main Street Matrix Liquid <br /> Escalon,CA 95320 <br /> Attention Greg Stahl QC Sample Group 9408532 -01-8 Reported Aug 19, 1994` <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 N Zahedi N Zahedi N Zahedi N Zahedi <br /> MS/MSD <br /> Batch#: 4080126 4080126 4080126 4080126 <br /> Date Prepared: 8/15/94 8/15/94 8/15/94 8/15/94 <br /> Date Analyzed: 8/15/94 8/15/94 8/15/94 8/15/94 <br /> Instrument 1-D #: HP-1 HP-1 HP-1 HP-1 <br /> Conc Spiked: 10Ng/L 10pg/L 10pg/L 30pg/L <br /> Matrix Spike <br /> % Recovery: 78 87 90 91 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 81 90 95 97 <br /> Relative% <br /> Difference: 3 8 34 54 6 4 <br /> ARn , .-<hfih - v vh v •°¢ <br /> LCS Batch# LCS081594 LCS081594 LCS081594 LCS081594 <br /> Date Prepared: 8/16/94 8/16/94 8/16/94 8/16/94 <br /> Date Analyzed: 8/16/94 8/16/94 8/16/94 8/16/94 <br /> Instrument I.D.#: HP-1 HP-1 HP-1 HP-1 <br /> LCS % <br /> Recovery: 113 108 107 115 <br /> Recovery <br /> Control Limits: 71-133 72-128 72-130 71-120 <br /> Please Note <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> �ELAP #2000 preparation,and analytical methods employed for the samples The matrix spike 1s 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 /> interference,the LCS recovery is to be used to validate the batch <br /> Vickie Tague Clark <br /> Project Manager 9408532 WAT <t> <br />