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Sequoia 680 Chesapeake Dnve 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 a Sacramento CA 95834 (916) 971 9600 FAX (916)921 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 /> r <br /> QUALITY CONTROL DATA REPORT <br />' Analyte Diesel <br /> QC Batch# GCO205980HBPEXB <br /> Analy Method EPA 8015M <br />' Prep Method EPA 3550 <br /> Analyst A Kaushanskaya <br />' MS/MSD# BLK020598 <br /> Sample Cone N D <br /> Prepared Date 2/5/98 <br /> Analyzed Date 2/5/98 <br />' Instrument I D # GCHP198 <br /> Cone 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 /> 1 <br />' LCS# <br /> Prepared Date <br /> Analyzed Date <br />' Instrument I D # <br /> Cone Spiked <br /> LCS Result <br /> LCS % Recov <br /> 50-150 <br /> LCS 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 fail within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> I Tod Granicher <br /> Project Manager xx MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9802209 PPP <3> <br />