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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 /> �„ r <br /> WPD8 Services Client Project ID Unocal #0123, 1034 Central Ave , Tracy <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 6121094-99 Reported Dec 30, 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 D Newcomb D Newcomb D Newcomb D Newcomb <br /> MS/MSD <br /> Batch# 6121117 6121117 6121117 6121117 <br /> Date Prepared 12/20/96 12/20/96 12/20/96 12/20/96 <br /> Date Analyzed 12/20/96 12/20/96 12/20/96 12/20/96 <br /> Instrument I D # HP-9 HP-9 HP-9 HP-9 <br /> Conc Spiked 20ug/L 20yg/L 20ftg/L 60Mg/L <br /> Matrix Spike <br /> % Recovery 110 110 110 115 <br />•' Matrix Spike <br /> Duplicate % <br /> Recovery 110 110 105 115 <br /> Relative % <br /> Difference 00 00 46 00 <br /> LCS Batch# 9LCS122096 9LCS122096 9LCS122096 9LCS122096 <br /> Date Prepared 12/20/96 12/20/96 12/20/96 12/20/96 <br /> Date Analyzed 12/20/96 12/20/96 12/20/96 12/20/96 <br /> Instrument I D # HP-9 HP-9 HP-9 HP-9 <br /> LCS % <br /> Recovery 110 110 105 117 <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 /> �ignature 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 /> 6121094 MPD <97 <br />