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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> lWaprealian Engineering, Inc Client Project 11) Unocal,7303 Pacific Ave ,Stockton <br /> 401 Stanwell Dr, Ste 400 Matrix water <br /> Concord, CA 94520 <br /> Attention Mardo Kaprealian, P E QC Sample Goup 3060894-897 Reported Jul 1, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 11-Dichloro- Trichloroethene Chloro <br /> ethene Benzene <br /> Method EPA 8010 EPA 8010 EPA 8010 <br /> Analyst K N K N K N <br /> Conc Spiked 10 10 10 <br /> Unrts 119/L u9/L !19/L <br /> LCS Batch# LCS062793 LCS062793 LCS062793 <br /> Date Prepared 6/27/93 6/27/93 6/27/93 <br /> Date Analyzed 6/27/93 6/27/93 6/27/93 <br /> Instrument I D # HP 5890/6 HP-5890/6 HP-5890/6 <br /> LCS % <br /> Recovery 95 98 97 <br />*Control Limrts 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch# 3060839 3060839 3060839 <br /> Date Prepared 6/27/93 6/27/93 6/27/93 <br /> Date Analyzed 6/27/93 6/27/93 6/27/93 <br /> Instrument I D # HP-5890/6 HP-5890/6 HP-5890/6 <br /> Matrix Spike <br /> % Recovery 99 100 100 <br /> Matrix Spike <br /> Duplicate <br /> Recovery 100 100 100 <br /> Relative % <br /> Difference 10 00 00 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA AN YTICAL preparation and analytical methods employed far the samples The LCS%recoverydata is used for <br /> �. validation of sample batch results Due to matrix effects,the QC limits for MS/MSD s are advisory only <br /> _ and are not used to accept or reject batch results <br /> J <br /> an B Kemp <br /> Project Manager iD <br /> 3060894 KEI e7> <br />