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Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (650) 364 9600 FAX(6-0)364-9253 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Sinker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Blaine Tech Services, Inc Client Project ID Shelf Stockton / 980129-S1 <br /> 1680 Rogers Ave Matrix Solid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9801 H79-08-09, 9801 H81-01-04 Reported Feb 13, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS020698MTBEF2A <br /> Analy Method EPA 8260 <br /> Prep Method N A <br /> Analyst L Zhu <br /> MS/MSD # - <br /> Sample Conc <br /> Prepared Date - <br /> Analyzed Date <br /> Instrument I D # <br /> Conc Spiked <br /> Result <br /> MS % Recovery - <br /> Dup Result - <br /> MSD % Recov - <br /> RPD - <br /> RPD Limit <br /> LCS # LCS020698 <br /> Prepared Date 2/6/98 <br /> Analyzed Date 2/6/98 <br /> Instrument I D.# F2 <br /> Conc Spiked 50pg/Kg <br /> LCS Result 41 <br /> LCS % Recov 82 <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 /> $ A LYTICAL 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 /> eg enn <br /> of t Manage **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 98011-179 BLA <12> <br />