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S� <br /> 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 8195trskerAvenue,Suite 8 Sacramento,CA 95834 (916) 921.9600 FAX(916)921.0100 <br /> MPDS Services Client Project lb: Unocal #6015,.601 E'. Ketfleman Lane, Lodi <br /> 2401 Stanwell Dr., Ste, 300 Matrix: Liquid <br /> Concord, CA 94520 <br /> Attention: Sarkis Karkarian QC Sample Group: 5091208-19 Reported: Oct 5 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. Nil] K.Nill <br /> MS/MSD <br /> Batch#: 5091208 5091208 5091208 5091208 <br /> Date Prepared: 10/2/95 10/2/95 10/2/95 10/2/95 <br /> Date Analyzed: 10/2/95 10/2/95 10/2/95 10/2/95 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP-4 <br /> Cone. Spiked: 20 pg/L 20 frg/L 20 pg/L 60 yg/L <br /> Matrix Spike <br /> % Recovery: 90 95 95 97 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 90 95 95 97 <br /> Relative % <br /> Difference: 0.0 0.0 0.0 0.0 <br /> LCS Batch#: 2LCS100295 2LCS100295 2LCS100295 2LCS100295 <br /> Date Prepared: 10/2/95 10/2/95 10/2/95 10/2/95 <br /> Date Analyzed: 10/2/95 10/2/95 10/2/95 10/2/95 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery: 92 96 98 97 <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 /> interference,the LCS recovery is to be used to validate the batch, <br /> Alan B. Kemp <br /> Project Manager <br /> 5091208.MPD <8> <br /> r* <br />