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4D Sequoia 680 Chesapeake Drive 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 /> 40 <br /> MPbS Services Client project Ib Unocal #6981, 4707 Pacific Ave, Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Sarkis Karkanan OC Sample Group 5041776-88 Reported May 12, 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 J Fontecha J Fontecha J Fontecha J Fontecha <br /> MS/MSD <br /> Batch# 5050077 5050077 5050077 5050077 <br /> Date Prepared 5/7/95 5/7/95 5/7/95 5/7/95 <br /> Date Analyzed 5/7/95 5/7/95 5/7/95 5/7/95 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> Conc Spiked 20ug/L 20jug/L 20ug/L 60pg/L <br /> Matrix Spike <br /> % Recovery 100 110 110 112 <br />• Matrix Spike <br /> Duplicate % <br /> Recovery 105 110 110 112 <br /> Relative% <br /> Difference 49 00 00 00 <br /> LCS Batch,#' 2LCS050795 2LCS050795 2LCS050795 2LCS050795 <br /> Date Prepared 5/7/95 5/7/95 5/7/95 5/7/95 <br /> Date Analyzed 5/7/95 5/7/95 5/7/95 5/7/95 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery 101 106 108 107 <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 /> SE000IA 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 recovery is to be used to validate the batch <br /> Alan B Kemp <br /> Project Manager <br /> 5041776 MPD <5> <br />