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Sequoia 660 Chesapeake Drive Rcdwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 15)' 404 N Wigct Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)988 9673 <br /> Analytical 819 S,nkcr Avcnue, Suite 8 Sacramento CA 95834 (9f6) 921 9600 FAX (916)921 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 Jessica Nelligan Work Order # 98021`69 01-03 Reported Mar 6, 1998 <br /> r <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO22598BTEXEXA GCO22598BTEXEXA GCO22598BTEXEXA GCO22598BTEXEXA GCO22598BTEXEXA <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 # 9802E9007 9802E9007 9802E9007 9802E9007 9802E9007 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 2/25/98 2/25/98 2/25/98 2/25/98 2/25/98 <br /> Analyzed Date 2/26/98 2/26/98 2/26/98 2/26/98 2/26/98 <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 019 019 020 062 1 1 <br /> MS % Recovery 95 95 100 103 92 <br /> Dup Result 020 020 020 065 1 1 <br /> MSD % Recov 100 85 100 108 92 <br /> RPD 51 51 00 47 00 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK022598 BLK022596 BLK022598 BLK022598 BLK02-2598 <br /> Prepared Date 2/25/98 2/25/98 2/25/98 2/25/98 2/25/98 <br /> Analyzed Date 2/25/98 2/25/98 2/25/98 2/25/98 2/25/98 <br /> Instrument I D # GCHP22 GCHP22 GCHP22 GCHP22 GCHP22 <br /> Conc Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 50 mg/Kg 1 2 mg/Kg <br /> LCS Result 021 020 020 060 12 <br /> LCS % Recov 105 100 100 100 100 <br /> MS <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 /> Tod Granicher interference,the LCS recovery is to be used to validate the batch <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 9802F69 PPP <1> <br />