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Sequoia 680 Chesapeake Dnve Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 4kPDS 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 Karkarlan QC Sample Group 5061985-90 Reported Jul 11, 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 A Tuzon A Tuzon A Tuzon A Tuzon <br /> MS/MSD <br /> Batch# BLK070395 BLK070395 BLK070395 BLK070395 <br /> Date Prepared 7/3/95 7/3/95 7/3/95 7/3/95 <br /> Date Analyzed 7/3/95 7/3/95 7/3/95 7/3/95 <br /> Instrument I D # HP-9 HP-9 HP-9 HP-9 <br /> Conc Spiked 20pg/L 20pg/L 20Ng/L 60/ig/L <br /> Matrix Spike <br /> % Recovery 120 120 125 135 <br />• Matrix Spike <br /> Duplicate % <br /> Recovery 115 115 120 128 <br /> Relative% <br /> Difference 43 43 41 5 3 <br /> LCS Batch# 4LCS070395 4LCS070395 4LCS070395 4LCS070395 <br /> Date Prepared 7/3/95 7/3/95 7/3/95 7/3/95 <br /> Date Analyzed 7/3/95 7/3/95 7/3/95 7/3/95 <br /> Instrument I D # HP-9 HP-9 HP-9 HP-9 <br /> LCS % <br /> Recovery 102 105 103 112 <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 B Kemp interference,the LCS recovery is to be used to validate the batch <br /> Project Manager <br /> 5061985 MPD <4> <br />