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Sequoia680 Chesapeake Drive Redwood Ciry, 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 Sinker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> OMPOS 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 Karkarian 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 M Creusere M Creusere M Creusere M Creusere <br /> MS/MSD <br /> Batch# 5080229 5080229 5080229 5080229 <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-5 HP-5 HP-5 HP-5 <br /> Conc Spiked 20 ug/L 20 Ng/L 20 Mg/L 60 jag/L <br /> Matrix Spike <br /> % Recovery 80 90 95 97 <br /> 10 Matrix Spike <br /> Duplicate% <br /> Recovery 90 105 110 112 <br /> Relative % <br /> Difference 12 15 15 14 <br /> LCS Batch## 3LCS080895 3LCS080895 3LCS080895 3LCS080895 <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 8/13/95 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 <br /> LCS % <br /> Recovery 96 96 99 102 <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 1s 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 /> aignature 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 ¢6> <br />