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Sequoia 680 Chesapeake Dnvc redwood City,CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> '�-'EnvirosV.. ' l l Client Protect ID' 'iF e-1 6131 Paclfic,AStockton k ,; <br /> 270 Perkins Ave Matrix Solid <br /> Sonoma, CA 95476 } <br /> :k <br /> ,Attention J Gaarder Work Order# 9709C09 -01-16 Reported Oct 6, 1997,v <br /> v .. ;�: .,,•r f' ,'k,�,.Nh. ' ,.r, „ , x r�,,..4 .r�. '� N ., . .. ,w . };N r r n ,. . ,. ,,....f <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> GIC Batch# MS092997MTBEEXA <br /> Analy Method: EPA 8260 <br /> Prep. Method: N A. <br /> Analyst: L.Zhu <br /> MS/MSD #• 9709CO903 <br /> Sample Conc • N D <br /> Prepared Date. 9/29/97 <br /> Analyzed Date: 9/29/97 <br /> Instrument I D.#. F2 <br /> Conc. Spiked: 2500 Ng/Kg <br /> Result 2600 <br /> 40 S %Recovery: 104 <br /> Dup. Result. 2800 <br /> MSD % Recov .. 112 <br /> RPD: 74 <br /> RPD Limit 0-25 <br /> LCS #: LCS092-997 <br /> Prepared Date 9/29/97 <br /> Analyzed Date: 9/29/97 <br /> Instrument LD #: F2 <br /> Conc.Spiked: 2500ug/Kg <br /> LCS Result. 103000 <br /> LCS % Recov.: 120 <br /> 60-140 <br /> LCS 70-130 <br /> Control Limits <br /> Please Dote <br /> The LCS 1s a control sample of known,Interferent-free matrix that is analyzed using the same reagents, <br /> OQUOIA ANALYTICAL 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 <br /> interference,the LCS recovery is to be used to validate the batch <br /> Gregory **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference <br /> /foliect Manager 9709C09 EEE 1> <br />