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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 /> X117 Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (9t6) 921 0100 <br /> Pacific Environmental Group Client Project ID 311-174 1A/5447, Stockton <br /> 2025 Gateway Place, Suite 440 Matrix Solid <br />' San Jose, CA 95110 <br /> Attention J Nelligan Work Order# 9802975 Reported Feb 24, 1998 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte MTBE Diesel <br />' QC Batch# MS021798MTBEEXA GCO218980HBPEXC <br /> Analy Method EPA 8260 EPA 8015M <br />' Prep Method NA EPA 3550/DHS <br /> Analyst M Williams G Fish <br /> MS/MSD # 9802D2106 980297503 <br />' Sample Cone N D N D <br /> Prepared Date 2/17/98 2/18/98 <br /> Analyzed Date 2/18/98 2/19/98 <br /> Instrument I D # F3 GCHP19A <br />' Cone Spiked 2500 ug/Kg 25 mg/Kg <br /> Result 2100 17 <br /> MS % Recovery 84 68 <br /> Dup Result 2100 18 <br /> MSD % Recov 84 72 <br /> RPD 00 57 <br /> RPD Limit 0-25 0-50 <br /> LCS # LCS021898 BLK021898 <br />' Prepared Date 2/18/98 2/18/98 <br /> Analyzed Date 2/18/98 2/19/98 <br /> Instrument I D # F3 13CHP19A <br /> Cone Spiked 2500 ug/Kg 25 mg/Kg <br /> LCS Result 2200 19 <br /> LCS % Recov 88 76 <br /> 60 140 50-150 <br /> LCS 65-135 60-140 <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 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 /> Tod Granicher Interference,the LCS recovery is to be used to validate the batch <br /> Project Manager **MS=Matrix Spike, MSD=IVIS Duplicate, RPD=Relative%Difference 9802975 PPP <1> <br />