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� 1 ^ <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 404 N Wlget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510) 988 9673 <br /> X117 Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> Smith Environmental Client Project ID 14650, 94-36711-10 <br /> 1260 Graphics Drive Matrix Liquid <br /> Modesto, CA 95351-1502 <br /> Attention Jeanne Homsey Work Order# 9704594-05 Reported Apr 23, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC042197BTEX02A GC042197BTEX02A GC042197BTEX02A GC042197BTEX02A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method 5030 5030 5030 5030 <br /> Analyst A Miraftab A Miraftab A Miraftab A.Miraftab <br /> MS/MSD# 9704694-08 9704694-08 9704694-08 9704694-08 <br /> Sample Conc N D N D N D N D <br /> Prepared Date 4/21/97 4/21/97 4/21/97 4/21/97 <br /> Analyzed Date 4/21/97 4/21/97 4/21/97 4/21/97 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP 2 <br /> Conc. Spiked 10 erg/L 10 ug/L 10 pg/L 30 fig/L <br /> Result 90 89 92 29 <br /> MS % Recovery 90 89 92 97 <br /> Dup Result 91 90 92 29 <br /> MSD %Recov 91 90 92 97 <br /> RPD 11 11 0 0 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS #" BLK042197A BLK042197A BLK042197A BLK042197A <br /> Prepared Date 4/21/97 4/21/97 4/21/97 4/21/97 <br /> Analyzed Date 4/21/97 4/21/97 4/21/97 4/21/97 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Conc. Spiked 10,ug/L 10ug/L 10pg/L 30pg/L <br /> LCS Result 85 84 87 27 <br /> LCS % Recov 85 84 87 so <br /> 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS Is a control sample of known,interferent-tree matrix that is analyzed using the same reagents, <br />• SEQ OIA 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 /> Sheila Flynn <br /> Project Manage **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative% Difference 9704594 SSS .43> <br />