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4 <br /> Sequoia 30 Chesapeake give Redwood City,CA 94063 415) 364-9600 FAX(415)364-9233 <br /> 404 N.Wiget Lane Walnut Creek,CA 94598 X510) 988-9600 FAX(510)968-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921-0100 <br /> MPD$ Services Cfienf Project ID: Unocal #6015,6i1 E. Kettleman, Lodi <br /> 2401 Stanwell Dr., Ste. 300 Matrix: Liquid <br /> :>Concord, CA 94520 <br /> Attention: Sarkis Karkarian QC Sample Group: 5080469-73 Reported: Aug 15, 1995'< <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: K.Nill K.Nill K.Nill K.Nill <br /> MS/MSD <br /> Batch#: 5080473 5080473 5080473 5080473 <br /> Date Prepared: 8/11/95 8/11/95 8/11/95 8/11/95 <br /> Date Analyzed: 8/11/95 8/11/95 8/11/95 8/11/95 <br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 <br /> Conc. Spiked: 20ug/L 20Ng/L 20ug/L 60u9/L <br /> Matrix Spike <br /> %Recovery: 85 100 110 112 <br /> i <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 90 110 120 120 <br /> Relative% <br /> Difference: 5.7 9.5 8.7 7.2 <br /> LCS Batch#: 1 LCS081195 1 LCS081195 1 LCS081195 1 LCS081195 <br /> Date Prepared: 8/11/95 8/11/95 8/11/95 8/11/95 <br /> Date Analyzed: 8/11/95 8/11/95 8/11/95 8/11/95 <br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery: 83 96 107 107 <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 /> Signature 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 /> 5080469.MPD <4> <br />