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Sequoia 680 Chesapeake Dnve Redwood Gty,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wi et Lane Walnut Creek CA 94598 510 988 9600 FAX(510 988 9673 <br /> Analytical g ` ' ' <br /> 819$tnker Avenue,Suite 8 Sacramento,CA 95834 (916) 92i 9600 FAX(916)921 4100 <br /> WPOS Services Client Project ID Unocal #5098, 5606 Pacific Ave , Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Sarkis Karkarian QC Sample Group 5061985-90 Reported Jul 11, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> i <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# 5061965 5061985 5061985 5061985 <br /> Date Prepared 7/2/95 7/2/95 7/2/95 7/2/95 <br /> Date Analyzed 7/2/95 7/2/95 7/2/95 7/2/95 <br /> Instrument I D # HP-4 HP 4 HP-4 HP-4 <br /> Conc Spiked 20yg/L 20Ng/L 20pg/L 60jug/L <br /> Matrix Spike <br /> % Recovery 100 105 110 112 <br /> 0 Matrix Spike <br /> Duplicate% <br /> Recovery 100 110 115 115 <br /> Relative% <br /> Difference 00 47 44 26 <br /> LCS Batch# 2LCS070295 2LCS070295 2LC8070295 2LCS070295 <br /> Date Prepared 7/2/95 7/2/95 7/2/95 7/2/95 <br /> Date Analyzed 7/2/95 7/2/95 7/2/95 7/2/95 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery 100 105 107 107 <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 /> 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 /> nature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Alan S Kemp interference,the LCS recovery is to be used to validate the batch <br /> Project Manager <br /> 5061985 MPD <3> <br />