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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (4 15) 364 9600 FAX (415) 364 9233 <br /> Analytical 1900 Bates Avenue,Suite L Concord,CA 94520 (510) 686 9600 FAX(510) 686 9689 <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> � y r r r •♦ r r r rvrn v <br /> -'Gettler Ryan/Geostrategles r Client Project ID r Unocal, #6981 <br /> 3035 Prospect Park Drive #80 Matrix Liquid <br /> Rancho Cordova, CA 95670 <br /> Attention Greg Gurist QC Sample Group 9409D48 -02 Reported Sep 27, 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 R Vincent R Vincent R Vincent R Vincent <br /> MS/MSD <br /> Batch# 9409BO502 940960502 9409BO502 9409BO502 <br /> Date Prepared NA N A, N A N A <br /> Date Analyzed. 9/23/94 9/23/94 9/23/94 9/23/94 <br /> Instrument I D #- GCHP-17 GCHP-17 GCHP-17 GCHP-17 <br /> Conc Spiked. 10pg/L 10yg/L long/L 30pg/L <br /> Matrix Spike <br /> % Recovery 97 98 100 100 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 96 96 98 100 <br /> Relative% <br /> Difference 1 0 21 20 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 /> 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 /> Tod Z e <br /> Project Manager 9409D48 GET <2a <br />