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Sequoia 680 Chesapeake Dnve Redwood City,CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> t900 Sates Avenue Suite L Concord,CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Kapreallan Engineering, Inc Client Project ID Unocal #0950, 2835 Navy Dr, Stockton <br /> 2401 Stanwell Dr , Ste 400 Matrix Solid <br /> Concord, CA 94520 <br /> Attention Avo Avedissian QC Sample Group 501-0833 Reported Feb 13, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Organic Lead <br /> Method LUFr <br /> Analyst T Le <br /> MS/MSD <br /> Batch# 5011176 <br /> Date Prepared 2/1/95 <br /> Date Analyzed 2/1/95 <br /> Instrument I D # SpectrAA 20 <br /> Cone Spiked 25 mg/kg <br /> Matrix Spike <br /> % Recovery 98 <br /> iMatrix Spike <br /> Duplicate % <br /> Recovery 99 <br /> Relative % <br /> Difference 10 <br /> LCS Batch# TL0124J 1 <br /> Date Prepared 2/1/95 <br /> Date Analyzed 2/1/95 <br /> Instrument I D # SpectrAA 20 <br /> LCS % <br /> Recovery 98 <br /> Recovery <br /> Control Limits 75 125 <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, #1271 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 /> AI B Ke p <br /> Project Ma ger <br /> 501-0833 KEI <2> <br />