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' Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 444 N Wigct Lane Walnut Creek CA 94598 (510) 968 9600 FAX(510)988 9673 <br /> 'IWO Analytical 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)929 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 Benzene Toluene Ethyl Xylenes Gas <br />' Benzene <br /> QC Batch# GCO21898BTEXEXB GCO21898BTEXEXB GCO21898BTEXEXB GCO21898BTEXEXB GCO21898BTEXE(B <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 5030 <br /> Analyst J Minkel J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD# 980292503 980292503 980292503 980292503 980292503 <br />' Sample Cone N D N D ND N D ND <br /> Prepared Date 2/18/98 2/18/98 2/18/98 2/18/98 2/18/98 <br /> Analyzed Date 2/19/98 2/19/98 2/19/98 2/19/98 2/19/98 <br />' Instrument I D # GCHP18 GCHP18 GCHP18 GCHP18 GCHP18 <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 017 0 18 018 056 1 2 <br /> MS % Recovery 85 90 90 93 100 <br /> Dup Result 015 0 16 016 050 1 0 <br /> MSD % Recov 75 85 80 83 83 <br /> RPD 13 12 12 11 18 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> I <br /> LCS # BLK021898 BLK021898 BLK021898 BLK021893 BLK021898 <br /> Prepared Date 2/18/98 2/18/98 2/18/98 2/18/98 2/18/98 <br /> Analyzed Date 2/18/98 2/18/98 2/18/98 2/18/98 2/18/98 <br />' Instrument I D # GCHP18 GCHP18 GCHP18 GCHP18 GCHP18 <br /> Cone Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg 1 2 mg/Kg <br /> LCS Result 018 018 018 056 1 2 <br /> ILCS % Recov 90 90 90 93 100 <br /> I 60-140 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 7D-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 /> Tod Granicher interference,the LCS recovery is to be used to validate the batch <br /> IProject Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 9802975 PPP <3> <br />