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j Sequoia 680 Chesapeake Orivc Redwood City,CA 94063 (4 15) 364 9600 FAX (415) 364 9233 <br /> Analytical 1940©ales Avcnuc,Suite L Concord CA 94520 (510) 686 9600 FAX(514)686 9689 <br /> 819 Striker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX (916) 921 0140 <br /> Gettler Ryan/Geostrategles Client Project ID v Unocal, #6981 <br /> 3035 Prospect Park Drive #80 Matrix Liquid <br /> Rancho Cordova, CA 95670 <br /> Attention Greg Gurist QC Sample Group 9409D48 -01 Reported Sep 27, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 80?--0 EPA 8020 EPA 8020 <br /> Analyst R vincent R Vincent R Vincent R Vincent <br /> MS/MSD <br /> Batch# 940980501 940980501 9409BO501 940960501 <br /> Date Prepared N A 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-20 GCHP-20 GCHP-20 GCHP-20 <br /> Conc Spiked 10 fig/L 10 fag/L 10 fig/L 30 fig/L <br /> Matrix Spike <br /> Recovery sa 97 97 100 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 96 98 99 100 <br /> Relative % <br /> Difference 21 10 2 0 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 It <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 /> To d I <br /> Project Manager 9409048 GET <1> <br />