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e <br /> r Sequoia 680 Chesapeake Dave 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 />`0 <br /> MPDS 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 6120367-368 Reported Dec 20, 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# 6120350 6120350 6120350 6120350 <br /> Date Prepared 12/18/96 12/18/96 12/18/96 12/18/96 <br /> Date Analyzed 12/18/96 12/18/96 12/18/96 12/18/96 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> Conc Spiked 20pg/L 20Hg/L 20ftg/L 60pg/L <br /> Matrix Spike <br /> % Recovery 100 120 110 107 <br /> is Matrix Spike <br /> Duplicate% <br /> Recovery 100 115 100 88 <br /> Relative % <br /> Difference 00 43 95 19 <br /> LCS Batch# 2LCS121896 2LCS121896 2LC8121896 2LCS121896 <br /> Date Prepared 12/18/96 12/18/96 12/18/96 12/18/96 <br /> Date Analyzed 12/18/96 12/18/96 12/18/96 12/18/96 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 100 115 110 88 <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 /> Alan B Kemp interference,the LCS recovery is to be used to validate the batch <br /> Project Manager <br /> 6120367 MPD <4> <br />