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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 /> DS Service§ Cllent Project b ... <br /> 491 Stanwell Dr., Ste. 300 Matrix: Liquid <br /> Concord, CA 94520 <br /> Attention: Sarkis Karkarlan OC 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#: 5091229 5091229 5091229 5091229 <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-9 HP-9 HP-9 HP-9 <br /> Conc. Spiked: 20 Mg/L 20lrg/L 20 Ng/L 60 pg/L <br /> Matrix Spike <br /> % Recovery: 100 105 105 115 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 110 115 115 123 <br /> Relative % <br /> Difference: 9.5 9.1 911 7.0 <br /> LCS Batch#: 9LCS100295 9LCS100295 9LCS100295 9LCS100295 <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-9 HP-9 HP-9 HP-9 <br /> LCS % <br /> Recovery: 91 99 101 111 <br /> % ecovery <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 /> nature 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 <6> <br />