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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 Striker Avenue Suitt 8 Sacramento CA 95834 (916) 921 9600 FAX (916)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 Jessica Nelligan Work Order# 9802F69 01-03 Reported Mar 6, 1998 <br /> r <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Diesel <br /> QC Batch# GCO225980HBPF-XC <br /> Analy Method EPA 8015M <br /> Prep Method EPA 3550/DMS <br /> Analyst A Porter <br />' MS/MSD # 9802D5803 <br /> Sample Conc N D <br /> Prepared Date 2/25/96 <br /> Analyzed Date 2/25/98 <br />' Instrument I ❑ # GCHP4 <br /> Conc Spiked 25 mg/Kg <br /> Result 18 <br /> MS % Recovery 72 <br /> Dup Result 20 <br />' MSD % Recov 80 <br /> RPD 11 <br /> RPD Limit 0-50 <br />' LCS# BLK022598 <br /> Prepared Date 2/25/98 <br /> Analyzed Date 2/25/98 <br /> Instrument I D # GCHP4 <br /> Conc Spiked 25 mg/Kg <br /> LCS Result 19 <br /> LCS % Recov 76 <br /> 60,x0 <br /> LCS 50-150 <br /> Control Limits <br /> IPlease Nate <br /> -free matrix that Is analyzed using the same reagents, <br /> The LCS Is a control sample of known, Interferent <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 /> interference,the LCS recovery Is to be used to validate the batch <br /> Tod Granicher <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9802F69 PPP <2> <br />