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Sequois 680 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 FAX(650) 364-9233 <br /> ia 404 N.Wiget Lane Walnut Creels.CA 94598 (925)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 /> 1551 Industrial Road San Carlos, CA 94070-4111 (650)232-9600 FAX (650) 232-9612 <br /> ........ ................. <br /> ;-,:ATCCAssociate's, Inc. Client Project ID SUSD%Stagg High School <br /> ,All 7 Lone Palm Avenue Matrix: Solid <br /> Modesto, CA 95351-1502 <br /> Attention: Tam Lutterman Worm Order#: 9903068 -01-03 Reported: Mar 25, 1999::':: <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: MTBE <br /> rQC Batch#: SP0303998260EXA <br /> Analy. Method: EPA 8260 <br /> Prep. Method: EPA 5030 <br /> Analyst: N.Nelson <br /> MS/MSD#: 9021992 <br />' Sample Conc.: N.D. <br /> Prepared Date: 3/3/99 <br /> Analyzed Date: 3/4/99 <br /> Instrument I.D.#: GCMS2 <br /> Conc. Spiked: 2500pg/Kg <br /> Result: 2400 <br />�MS % Recovery: 96 <br /> Dup. Result: 2400 <br /> MSD % Recov.: 96 <br /> RPD: 0.0 <br /> RPD Limit: 0-25 <br /> ....... ........: ........ ......... <br /> LCS #: LCS030999 <br /> iPrepared Date: 3/9/99 <br /> Analyzed Date: 3/10/99 <br /> Instrument I.D.#: GCMS2 <br /> Conc. Spiked: 2500yg/Kg <br /> LCS Result: 2500 <br /> LCS % Recov.: 100 <br /> 60-140 <br /> 1 LCS 70-130 <br /> Control Limits <br />' Please Note: <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known, interferent-free matrix that is analyzed using the same reagents, <br /> lap#1271 preparation,and analytical methods employed for the samples. The matrix spike is an aliquot of sample <br /> % t 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 /> K 7Ki <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative% Difference 9903068.AAA 41> <br />