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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 9600 FAX (510) 988 9673 <br /> Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 9Z 1 0100 <br /> Pacific Environmental Group Client Project ID 311-174 1A/BP 5447, Stockton <br /> 2025 Gateway Place, Suite 440 Matrix SOLID <br />' San Jose, CA 95110 <br /> Attention Jessica Nelligan Work Order# 9802209 01, 02 Reported Feb 11, 1998 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br />' QC Batch# MS0201598MTBEEXA <br /> Analy Method EPA 8260 <br />' Prep Method <br /> Analyst M Williams <br />' MS/MSD# 980220902 <br /> Sample Conc 300 <br /> Prepared Date 2/6/98 <br /> Analyzed Date 2/6/98 <br />' Instrument 1 D # H6 <br /> Conc Spiked 2500 Ng/Kg <br /> Result 2600 <br /> MS % Recovery 92 <br /> Dup Result 2700 <br />' MSD % Recov 96 <br /> RPD 36 <br /> RPD Limit 0-25 <br /> I <br />' LCS# LCS020698 <br /> Prepared Date 2/6/98 <br /> Analyzed Date 2/6/98 <br /> Instrument I D # H6 <br /> Conc Spiked 2500pg/Kg <br /> LCS Result 2300 <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 /> SEQUOIA 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 sub)ected to the entire analytical procedure H <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 /> Tod Granlcher **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference <br /> Project Manager 9902209 PPP <2> <br />