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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N.Wiget Lane Walnut Creek,CA 94598 (915)988-9600 FAX(925)988-9673 <br /> a 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 /> f .>ttler Ryan-Dublin Client Project"ID.....Tosco#11195, Lathrop <br /> 6747 Sierra Court, Suite J Matrix: Solid <br /> Dublin, CA 94566 <br /> Attention: Clyde Galantine OC Sample Group: 9010218-227 Reported: Jan 21, 1999:.' <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: MTBE Lead Lead <br /> QC Batch#: MS011499 ME010799 ME010799 <br /> MTBEEXA 601OMDA 60101VIDA <br /> Analy. Method: EPA 8260 EPA 6010 EPA 6010 <br /> Prep. Method: EPA 8260 EPA 3050 EPA 3050 <br /> Analyst: M.Williams J.Kelly <br /> MS/MSD #: 9901585-09 9010218 <br /> Sample Conc.: N.D. N.D. <br /> Prepared Date: 1/14/99 1/7/99 <br /> Analyzed Date: 1/15/99 1/8/99 <br /> Instrument LD.#: F2 MV-4 <br /> Conc. Spiked: 2500pg/kg 50 mg/kg <br /> Result: 2,200 18 <br /> MS % Recovery: 88 <br /> Dup. Result: 2,100 19 <br /> SD % Recov.: 84 - <br /> RPD: 4.7 5.4 <br /> RPD Limit: 0-25 0-20 <br /> LCS #: VMB0114S LCS010799 LCS010799 <br /> Prepared Date: 114/99 17/99 1/7/99 <br /> Analyzed Date: 1/14/99 1/8/99 1/12/99 <br /> Instrument I.D.#: F2 MV-4 MV-3 <br /> Conc. Spiked: 2500 erg/kg 50 mg/kg 50 mg/kg <br /> LCS Result: 2,300 45 40 <br /> LCS % Recov.: 92 90 80 <br /> LCS 70-130 80-120 80-120 <br /> Control Limits <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 /> & #4210 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 recove is to be used to validate the batch. <br /> ulianne Fegley **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference <br /> Project Manager <br /> 9010220.GET <15> <br />