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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> Iwo (510) 686-9600 FAX (510) 686-9689 <br /> PDS Services Client Project 1D Unocal 6348, 3788 Tracy Blvd,Tracy <br /> 01 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedessian QC Sample Group 3120724-26 Reported Dec 22, 1993 <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 A Tuzon A Tuzon A Tuzon A Tuzon <br /> MS/MSD <br /> Batch# 3120700 3120700 3120700 3120700 <br /> Date Prepared 12/20/93 12/20/93 12/20/93 12/20/93 <br /> Date Analyzed 12/20/93 12/20/93 12/20/93 12/20/93 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> Conc Spiked 20 pg/L 20pg/L 20,ug/L 60 fug/L <br /> Matrix Spike <br /> % Recovery 106 107 111 110 <br /> 0 Matrix Spike <br /> Duplicate% <br /> Recovery 102 102 107 105 <br /> Relative% <br /> Difference 38 48 37 47 <br /> LCS Batch# LCS122093 LCS122093 LCS122093 LCS122093 <br /> Date Prepared 12/20/93 12/20/93 12/20/93 12/20/93 <br /> Date Analyzed 12/20/93 12/20/93 12/20/93 12/20/93 <br /> Instrument I D # HP-2 HP 2 HP-2 HP-2 <br /> LCS % <br /> Recovery 100 104 105 107 <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 /> EQUOIA 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 /> ���JJJ interference,the LCS recoveryis to be used to validate the batch <br /> Ala eil <br /> mp <br /> Project Maria r <br /> 3120724 MPD <3> <br />