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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 FAX(650)364-9Z33 <br /> 404 N.Wlget Lane walnut Creek,CA 94598 (925)988.9600 FAX(9Z5)988.9673 <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834" (916)921-9600 FAX(916)921-0100 <br /> IIF Analytical 1455 McDowell Blvd.North.Ste.D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> `settler-�{yan Dun ....... i <br /> blile nt Project Yosco#11195, Lathrop <br /> `< 0747 Sierra Court, Suite J Matrix: Liquid <br /> Dublin, CA 94568 <br /> «Attention: Doug Lee OC Sample Group: 902-0150 Reported: Feb 3, 1999;:: <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: C.Westwater C.Westwater C.Westwater C.Westwater <br /> MS/MSD <br /> Batch#: 9011602 9011602 9011602 9011602 <br /> Date Prepared: 2/2/99 2/2/99 2/2/99 2/2/99 <br /> Date Analyzed: 2/2/99 2/2/99 2/2/99 2/2/99 <br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 <br /> Conc. Spiked: 20frg/L 20pg/L 20pg/L 60Ng/L <br /> Matrix Spike <br /> % Recovery: 85 85 85 92 <br /> Matrix Spike <br /> -s Duplicate % <br /> Recovery: 100 100 100 110 <br /> Relative% <br /> Difference: 16 16 16 18 <br /> LCS Batch#: 2LCS020299 2LCS020299 2LCS020299 2LCS020299 <br /> Date Prepared: 2/2/99 2/2/99 2/2/99 2/2/99 <br /> Date Analyzed: 2/2/99 2/2/99 2/2/99 2/2/99 <br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery: 95 90 95 105 <br /> ecovery <br /> Control Limits: 70.130 70-130 70.130 70-130 <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 /> /J 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 recovery is to be used to validate the batch. <br /> Julianne Fegley <br /> Project Manager <br /> 9020150.GET [2> <br />