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Sequoia 680 Geake Drive Redwood City,CA 94063(650)364-9600 FAX(650)364-9233 <br /> q404 N.Wiget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento.CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd.North:Ste.D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 114` .Lat o <br /> - - C enf Pro e <br /> tID: osco# <br /> Gettler Ryan Dublin j P <br /> 6747 Sierra Court, Suite J Matrix: Liquid <br /> Dublin, CA <br /> 94568 <br /> Attention: Doug Lee <br /> ee QC Sample Group 904-0867 Reported: Apr 20, 1999::::.: <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 4 Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: C.Westwater C.Westwater C.Westwater C.Westwater <br /> MS/MSD <br /> Batch#: 9040734 9040734 9040734 9040734 <br /> Date Prepared: 4/14/99 4/14/99 4/14/99 4/14/99 <br /> Date Analyzed: 4/14/99 4/14/99 4/14/99 4/14/99 <br /> Instrument I.D.#: HP-5 HP-5 HP-5 HP-5 <br /> Conc. Spiked: i 20Ng/L 20Ng/L 20Ng/L 60Ng/L <br /> Matrix Spike <br /> % Recovery: 90 90 90 92 <br /> Matrix Spike <br /> Duplicate% i <br /> Recovery: 85 90 90 93 <br /> Relative % <br /> Difference: 5.7 0.0 0.0 1.8 <br /> LCS Batch#: 51-CSO41499 5LCSO41499 5LCSO41499 5LCSO41499 <br /> Date Prepared: 4/14/99 4/14/99 4/14/99 4/14/99 <br /> Date Analyzed: 4/14/99 4/14/99 4/14/99 4/14/99 <br /> Instrument I.D.#:.! HP-5 HP-5 HP-5 HP-5 <br /> LCS %; <br /> Recovery: 90 95 95 98 <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,'iinterferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALY;TICAL,'#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 /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recoveryis to be used to validate the batch. <br /> Julianne Fegley <br /> Project Manager <br /> 9040867.GET <3> <br />