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Sequoia 680 Chesapeake Dnve Redwood City,CA 94063 (415) 364 9600 FAX(415)364 9233 <br /> ,!TN 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> xw Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> WDS Services Client Project ID 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 7091413-420 Reported Oct 8, 1997 <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 D Newcomb D Newcomb D Newcomb D Newcomb <br /> MS/MSD <br /> Batch# 7091416 7091416 7091416 7091416 <br /> Date Prepared 9/30/97 9/30/97 9/30/97 9/30/97 <br /> Date Analyzed 9/30/97 9/30/97 9/30/97 9/30/97 <br /> Instrument I D # HP 4 HP 4 HP-4 HP 4 <br /> Conc Spiked 20 jug/L 20 ug/L 20 ug/L 60 Pg/L <br /> Matrix Spike <br /> % Recovery 85 90 85 92 <br /> . Matrix Spike <br /> Duplicate % <br /> Recovery 85 85 85 90 <br /> Relative % <br /> Difference 00 57 00 1 8 <br /> LCS Batch# 4LCS093097 4LCS093097 4LCS093097 4LCS093097 <br /> Date Prepared 9/30/97 9/30/97 9/30/97 9/30/97 <br /> Date Analyzed 9/30/97 9/30/97 9/30/97 9/30/97 <br /> Instrument I D # HP 4 HP 4 HP 4 HP-4 <br /> LCS % <br /> Recovery 90 95 90 95 <br /> Recovery <br /> Control Limits 70-130 70 130 70-130 70-130 <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 /> 101 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 /> 7091413 MPD <67 <br />