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ID <br /> 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 /> 'Wr Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> OMPDS Services Client Project 1D Unocal #5098 5606 Pacific Ave Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 6061488-495 Reported Jun 27, 1996 <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 S Chullakorn S Chullakorn S Chullakorn S Chullakorn <br /> MS/MSD <br /> Batch# 6061495 6061495 6061495 6061495 <br /> Date Prepared 6/24/96 6/24/96 6/24/96 6/24/96 <br /> Date Analyzed 6/24/96 6/24/96 6/24/96 6/24/96 <br /> Instrument I D # HP-5 HP-5 HP 5 HP-5 <br /> Conc Spiked 20ug/L 20ug/L 20ug/L 60pg/L <br /> Matrix Spike <br /> % Recovery 90 85 85 90 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 75 75 80 80 <br /> Relative % <br /> Difference 18 13 6 0 12 <br /> LCS Batch# 5LCS062496 5LCS062496 5LCS062496 5LCS062496 <br /> Date Prepared 6/24/96 6/24/96 6/24/96 6/24/96 <br /> Date Analyzed 6/24/96 6/24/96 6/24/96 6/24/96 <br /> Instrument I D # HP-5 HP-5 HP-5 HP 5 <br /> LCS % <br /> Recovery 90 90 90 92 <br /> Recovery <br /> Control Limits 60-140 60-140 60-140 60-140 <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 /> Signature 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 /> 6061488 MPD <4;, <br />