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( (y� <br /> j Sequoia 680 Chesapeake drive Redwood City CA 94063 (415) 364 9640 FAX(415)364 9233 <br /> 1900 Bates Avenue Suite L Concord CA 94520 (510) 686 9500 FAX(510)686 9689 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921-0100 <br /> MPDS Services Client Project Ib Unocal #2859, 1665 pacific Ave , Stockton <br /> 2401 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedessian QC Sample Group 4080913-919 Reported Aug 30, 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 A Tuzon A.Tuzon A.Tuzon A.Tuzon <br /> MS/MSD <br /> Batch# 4080905 4080905 4080905 4080905 <br /> Date Prepared 8/24/94 8/24/94 8/24/94 8/24/94 <br /> Date Analyzed 8/24/94 8/24/94 8/24/94 8/24/94 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> Conc Spiked 20pg/L 20vg/L 20pg/L 6opg/L <br /> Matrix Spike <br /> . % Recovery 95 95 100 105 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 95 95 100 102 <br /> Relative % <br /> Difference 00 00 00 29 <br /> LCS Batch# 1 LCS082494 1 LCS082494 1 LCS082494 i LCS082494 <br /> Date Prepared 8/24/94 8/24/94 8/24/94 8/24/94 <br /> Date Analyzed 8/24/94 8/24/94 8/24/94 8/24/94 <br /> Instrument I�+D # HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 105 106 114 112 <br /> i <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 /> QUOTA 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 /> Signature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Interference,the LCS recove is to be used to validate the batch <br /> Alan B Kemp <br /> Project Manager <br /> 4080913 MPD <4> <br />