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' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> rY� 1 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 8 t9 Striker Avenue, Suite 8 Sacramento CA 95834 (916) 921 9640 FAX(916)921 0100 <br />' Pacific Environmental Group Client Project lD 311-1741A/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# G0021898BTExEXB GCO21898BTEXEXB GCO21898BTEXEXB GCO21898BTEXEXB GCO21898STEXEXB <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 ND N D N D N D N D <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 />' Cone Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 50 mg/Kg 1 2 mg/Kg <br /> Result 017 018 018 056 12 <br /> lie MS % Recovery 85 90 90 93 100 <br /> Dup Result 015 016 016 050 10 <br /> MSD % Recov 75 85 e0 83 88 <br />' RPD 13 12 12 11 18 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK021898 BLK021898 BLK021898 BLK021896 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 12 <br />' LCS % Recov 90 90 90 93 100 <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 /> I fortified with known quantities of specific compounds and subjected to the entire analytical procedure tf <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Tod Granlcher interference,the LCS recovery is to be used to validate the batch <br /> Project Manager **MS=Matrix Spike, MSD MS Duplicate, RPD=Relative% Difference 9802975 PPP <3> <br />