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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 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 Nelligan Work Order# 9802209 01, 02 Reported Feb 11, 1998 <br /> r <br /> QUALITY CONTROL DATA REPORT <br />' Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> OC Batch# GCO20698BTEXEXA GCO20698BTEXEXA GCO20698BTEXEXA G0020698BTEXEXA GCO20698BTEXEXA <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br />' Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 503D <br /> Analyst J Minkel J Minkel J Minkel J Minkel J Minkel <br />' MS/MSD# 980221107 960221107 980221107 980221107 980221107 <br /> Sample Conc N D ND N D N D ND <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 o 18 017 018 054 11 <br /> MS % Recovery 90 85 90 90 32 <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 o 19 019 019 057 1 1 <br /> LCS % Recov 95 95 95 35 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 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 /> interference,the LCS recovery is to be used to validate the batch <br /> Tod Granicher <br /> Project Manager **MS=Matrix Spike, MSD=IVIS Duplicate, RPE)=Relative%Difference 9802209 PPP <1> <br /> - - — r9` <br />