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tSequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue Suite L Concord CA 94520 (5 10) 686 9600 FAX(510)686 9689 <br /> Analytical 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> PRESNA Client Project ID 150070 01, Chase Chevrolet <br /> 1710 Main Street Matrix Liquid <br /> ' Escalon, CA 95320 <br /> Attention Greg Stahl QC Sample Group 4F37913 Reported Jun 17, 1994 <br /> i <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: J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD <br /> ' B8tch#: 4F33416 4F33416 4F33416 4F33416 <br /> Date Prepared: <br /> Date Analyzed: 6/8/94 6/8/94 6/8/94 6/8/94 <br /> ' Instrument LD#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Conc Spiked. lowg/L 10lig/L 10Mg/L 30Ng/L <br /> Matrix Spike <br /> % Recovery: 100 100 110 103 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 100 110 110 110 <br /> Relative% <br /> tDifference 00 95 0 0 66 <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 /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure R <br /> the recovery of analytes from the matrix spike does not fail 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 41=37901 WAT <8n <br />