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Sequoia 680 Chesapeake Drive Redwood Cty, CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> l <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> �I� Analytical 819 Straker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> IDPDS 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# 7090580 7090580 7090580 7090580 <br /> Date Prepared 9/29/97 9/29/97 9/29/97 9/29/97 <br /> Date Analyzed 9/29/97 9/29/97 9/29/97 9/29/97 <br /> Instrument I D # HP 2 HP 2 HP 2 HP-2 <br /> Conc Spiked 20lrg/L 20 ug/L 20 pg/L 60 fig/L <br /> Matrix Spike <br /> % Recovery 105 100 100 108 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 105 100 95 103 <br /> Relative% <br /> Difference 00 00 51 47 <br /> LCS Batch# 2LCS092997 2LCS092997 2LCS092997 2LCS092997 <br /> Date Prepared 9/29/97 9/29/97 9/29/97 9/29/97 <br /> Date Analyzed 9/29/97 9/29/97 9/29/97 9/29/97 <br /> Instrument I D # HP-2 HP-2 HP 2 HP-2 <br /> LCS % <br /> Recovery 100 95 90 103 <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 /> 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 recove is to be used to validate the batch <br /> Project Manager <br /> 7091413 MPD <7> <br />