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Sequoia680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N W,get Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)988 9673 <br /> 1W ,ll� Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 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 Nellligan Work Order# 9802211 01-09 Reported Feb 13, 1998 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br />' Benzene <br /> QC Batch# GCO20598BTEXEXA GCO20698BTEXEXA GCO20698BTEXEXA GCO20698BTEXEXA GCO20698BTEXEXA <br /> Anally Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method 5030 5030 5030 5030 5030 <br />' Analyst J Minkel J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD # 980221107 980221107 980221107 980221107 980221107 <br /> Sample Conc N D N D N D N D N D <br />' Prepared Date 2/6/98 2/6/98 2/6/98 2/6/98 2/6/98 <br /> Analyzed Date 2/6/98 2/6/98 2/6/98 2/6/98 2/6/98 <br /> Instrument I D # GCHP7 GCHP7 GCHP7 GCHP7 GCHP7 <br />' Conc Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg 1 2 mg/Kg <br /> Result 018 017 018 054 11 <br /> MS % Recovery 90 85 90 90 92 <br /> Dup Result 018 017 018 054 11 <br /> MSD % Recov 90 85 90 90 92 <br />' RPD 00 00 00 00 00 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK020698 BLK020698 BLK020698 BLK020698 BLK020698 <br />' Prepared Date 2/6/98 2/6/98 2/6/98 2/6/98 2/6/98 <br /> Analyzed Date 2/6/98 2/6/98 2/6/98 2/6/98 2/6/98 <br /> Instrument I D # GCHP7 GCHP7 GCHP7 GCHP7 GCHP7 <br />' Conc Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg 1 2 mg/Kg <br /> LCS Result 019 019 019 0 57 1 1 <br /> LCS % Recov 95 95 95 95 92 <br /> 60-140 60-140 60-140 60-140 60-140 <br />' LCS 70-130 70-130 70-130 70-130 70-130 <br /> Control Limits <br />' Please Note <br /> The LCS 1s a control sample of known,interferent-free matrix that 1s analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike 1s 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 rnatnx <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 9802211 PPP <2> <br />