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o. <br />�} Sequoia680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 998 9600 FAX(510)988-9673 <br /> Analytical 819 Sinker Avenue Suite 9 Sacramento,CA 95834 (916) 921 9600 FAX(916)921-0100 <br /> Vii-or <br />*MPDS Services Client Project ID Unocal #6981, 4707 pacific Ave, Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Sarkis Karkanan QC Sample Group 5072006-18 Reported Aug 10, 1995 <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 K Nill K Nill K Nill K Nill <br /> MS/MSD <br /> Batch# 5072011 5072011 5072011 5072011 <br /> Date Prepared 8/8/95 8/8/95 8/8/95 8/8/95 <br /> Date Analyzed 8/8/95 8/8/95 8/8/95 8/8/95 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> Cone Spiked 20pg/L 20/ug/L 20ug/L 60pg/L <br /> Matrix Spike <br /> % Recovery 90 105 115 113 <br /> soMatrix Spike <br /> Duplicate % <br /> Recovery 80 95 100 100 <br /> Relative% <br /> Difference 12 10 14 13 <br /> LCS Batch#• 2LCS080895 2LCS080895 2LCS080895 2LCS080895 <br /> Date Prepared 8/8/95 8/8/95 8/8/95 8/8/95 <br /> Date Analyzed 8/8/95 8/8/95 8/8/95 8/8/95 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery 93 110 114 114 <br /> ecovery <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, #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 /> Rignature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Alan B Kemp interference,the LCS recovery is to be used to validate the batch <br /> Project Manager <br /> 5072006 MPD <7> <br />