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+ Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> • �„� Analytical 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> 819 Sinker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> %PDS Services Client project ID Unocal #5098, 5606 Pacific Ave , Stockton <br /> 2401 Stanwell Or, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Sarkis Karkanan 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# 5062178 5062178 5062178 5062178 <br /> Date Prepared 7/5/95 7/5/95 7/5/95 7/5/95 <br /> Date Analyzed 7/5/95 7/5/95 7/5/95 7/5/95 <br /> Instrument I D # HP-4 HP-4 HP 4 HP-4 <br /> Conc Spiked 20 frg/L 20 Vg/L 20 ug/L 60 ug/L <br /> Matrix Spike <br /> % Recovery 85 90 90 90 <br />. Matrix Spike <br /> Duplicate % <br /> Recovery 100 105 105 107 <br /> Relative % <br /> Difference 16 15 15 17 <br /> LCS Batch# 2LCS070595 2LCS070595 2LCS070595 2LCS070595 <br /> Date Prepared 7/5/95 7/5/95 7/5/95 7/5/95 <br /> Date Analyzed 7/5/95 7/5/95 7/5/95 7/5/95 <br /> Instrument I D # HP 4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery 98 103 104 104 <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 /> 19nature an 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 <6> <br />