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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 />*MPDS Services Client Project ID Unocal #0187, 437 Miner Ave ,Stockton <br /> 1 <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 6020403-414 Reported Feb 23, 1996 <br /> i <br /> QUALITY CONTROL DATA REPORT <br /> I <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst L Huang L Huang L Huang L Huang <br /> MS/MSD <br /> Batch# 6020305 6020305 6020305 6020305 <br /> Date Prepared 2/19/96 2/19/96 2/19/96 2/19/96 <br /> Date Analyzed 2/19/96 2/19/96 2/19/96 2/19/96 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> Conc Spiked 20ug/L 20ug/L 20ug/L 60jig/L <br /> Matrix Spike <br /> % Recovery 115 110 110 110 <br />. Matrix Spike <br /> Duplicate % <br /> Recovery 105 100 100 100 <br /> Relative % <br /> Difference 91 95 95 95 <br /> LCS Batch# 1 LCS021996 1 LCS021996 1 LCS021996 1 LCS021996 <br /> Date Prepared 2/19/96 2/19/96 2/19/96 2/19/96 <br /> Date Analyzed 2/19/96 2/19/96 2/19/96 2/19/96 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 115 115 115 115 <br /> Recovery <br /> Control Limits 71-133 72-128 72-130 71-120 <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 /> eignature 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 /> 6020403 MPD ¢5� <br />