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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 (510) 988-9680 FAX(510)988-9673 <br /> Anal 1Cal 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921-0180 <br /> • .;ii. <br /> a <br /> ! _am' f�ii <br /> b a Client Project ID. Shell 1267 Country Club Road <br /> { ;:`270 Perkins Avenue Matrix: Liquid t i <br /> ::':Sonoma, CA 95476 <br /> ","Attention: Joe Neely Work Order#: 9802D55-01-03 Reported: Mar 5, 1998',` <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: MTBE' ;4, <br /> QC Batch#: MS022098MTBEH6A i <br /> i Anally. Method: EPA 8260 <br /> iI Prep. Method: _ N.A. <br /> Analyst: L. Duong <br /> MS/MSD #: 980273701 <br /> Sample Conc.: N.D. <br /> Prepared Date: 2/20/98 <br /> Analyzed Date: 2/20/98 <br /> Instrument I.D.#: H6 ! <br /> Conc. Spiked: 50 Mg/L a <br /> Result: 50 <br /> MS % Recovery: 100 <br /> Dup. Result: 53 <br /> MSD% Recov.: 106 w . <br /> RPD: 5.8 <br /> RPD Limit: 0-25 <br /> LCS #: LCS022498 <br /> Prepared Date: 2/24/98 <br /> t <br /> P <br /> Analyzed Date: 2/24/98 <br /> Instrument I.D.#: H6 <br /> Conc. Spiked: 50pg/L <br /> LCS Result: 55 <br /> LCS % Recov.: 110 <br /> 60-140 <br /> LCS 70-130 <br />[ Control Limits <br /> I` Please!Vote: <br /> I The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> zrojectManager <br /> TICAL 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 /> is 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 /> **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative% Difference 9802D55.CCC <4> <br />