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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 /> GPD8 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# 7091854 7091854 7091854 7091854 <br /> Date Prepared 9/27/97 9/27/97 9/27/97 9/27/97 <br /> Date Analyzed 9/27/97 9/27/97 9/27/97 9/27/97 <br /> Instrument I D # HP-5 HP 5 HP 5 HP-5 <br /> Conic Spiked 20Mg/L 20Mg/L 20Mg/L 60Ng/L <br /> Matrix Spike <br /> % Recovery 95 95 95 98 <br /> . Matrix Spike <br /> Duplicate% <br /> Recovery 95 95 90 97 <br /> Relative % <br /> Difference 0 0 00 5 4 1 7 <br /> LCS Batch# 5LCS092797 5LCS092797 5LCS092797 5LCS092797 <br /> Date Prepared 9/27/97 9/27/97 9/27/97 9/27/97 <br /> Date Analyzed 9/27/97 9/27/97 9/27/97 9/27/97 <br /> Instrument I D # HP 5 HP 5 HP-5 HP-5 <br /> LCS % <br /> Recovery 100 100 95 102 <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 /> �gnature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recove is to be used to validate the batch <br /> Alan B Kemp <br /> Project Manager <br /> 7091413 MPD <9> <br />