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' Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue Suite L Concord,CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> } <br /> RESNA Client Project ID 150070 01, Chase Chevrolet <br /> 1710 Main Street Matrix Liquid <br /> Escalon, CA 95320 <br /> ' r Attention Greg Stahl OC Sample Group 4F33302 ri Reported Jun 20, 1994, <br /> —"z <br /> � 3A it <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 /> ' 138104 4F33301 41733301 4F33301 4F33301 <br /> Date Prepared. <br /> Date Analyzed 6/9/94 6/9/94 6/9/94 6/9/94 <br /> ' Instrument I D #• GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Conc Spiked 10jig/L 10pg/L 10yg/L 30Ng/L <br /> Matrix Spike <br /> %Recovery 100 110 110 107 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 110 110 110 110 <br /> Relative % <br /> ' Difference. 9 5 00 00 2 8 <br /> ' LCS Batch#. - <br /> ' Date Prepared - <br /> Date Analyzed <br /> Instrument I D # - - <br /> ' LCS % <br /> Recovery <br /> ' °�6 ecovery <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 If <br /> /inn �/Jr 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 4F33301 WAT <5> <br />