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Sequoia 680 Chesapeake Drive Redwood Gm CA 94063 (650) 364.9600 FAX(650)364-9233 <br /> 404 N.Wiget Lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)988-%73 <br /> 6� Analytical s19 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921.0100 i <br /> ......... �... <br /> :........ <br /> A Environ Client Pra'ect ID: Shell Stockton <br /> 270 Perkins Ave. Matrix: Solid <br /> a <br /> ,.'Sonoma, CA 95476 <br /> f Attention: Torre Magney Work Order#: 9710H60-01-04 Reported: Nov 6, 1997::::: <br /> I <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: MTBE <br /> QC Batch#: MS103197MTBEEXA <br /> Analy. Method: EPA 8260 <br /> E Prep. Method: N.A. <br /> Analyst: M.Williams <br /> t MS/MSD #: 9710HO801 <br /> Sample Conc.: 130 <br /> Prepared Date: 10/31/97 <br /> Analyzed Date: 10/31/97 <br /> Instrument I.D.#: H6 <br /> Conc. Spiked: 2500{tg/Kg <br /> Result: 2200 <br /> l MS % Recovery: 83 <br /> Dup. Result: 2200 <br /> (-)MSD %Recov.: 83 <br /> r <br /> i <br /> w. <br /> RPD: 0.0 <br /> RPD Limit: 0-25 t <br /> :.:....::::n,.n.:...:....:...::::::.:.. ...............n.::::.....: .:.. :. <br /> ......... . ;.::_.... <br /> ............. .......... <br /> LCS #: LCS110497 <br /> L Prepared Date: 11/4/97 <br /> Analyzed Date: 11/4/97 <br /> Instrument I.D.#: H6 } <br /> t Conc. Spiked: 2500 pg' /Kg <br /> f <br /> E LCS Result: 2360 <br /> LCS % Recov.; 92 <br /> 60-140 <br /> LCS 70-130 ' <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 /> Zregory7 <br /> CAL 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 I <br /> interference,the LCS recovery is to be used to validate the batch. <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD-Relative%Difference 9710H60.EEE a2> <br /> k <br />