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q till it, <br /> 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> IDSequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> � Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-034Z <br /> i <br /> ATC Associates, Inc Client Project ID Stockton Fire Station#2 <br /> 1260 Graphics Drive Matrix Liquid <br /> Modesto, CA 95351-1502 <br /> Attention Jeanne Homsey Work Order# 9806259 -01-04 Reported Jun 19, 1998 <br /> I <br /> QUALITY CONTROL DATA REPORT <br /> Analyte. Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC060998802005A GCO60998802005A GCO60998802005A GCO60998802005A GCO60998802005A <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 K Nill K Nill K Nill K Nill K Nill <br /> MS/MSD # 806051801 806051801 806051801 806051801 806051801 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date- 6/9/98 6/9/98 6/9/98 6/9/98 6/9/98 <br /> Analyzed Date 6/9/98 6/9/98 6/9/98 6/9/98 6/9/98 <br /> Instrument I D # HP5 HP5 HP5 HP5 HP5 <br /> Conc Spiked 20pg/L 20ug/L 20pg/L 60pg/L 310pg/L <br /> Result 17 18 18 57 300 <br /> •MS % Recovery 85 90 90 95 97 <br /> Dup. Result. 18 18 18 57 300 <br /> MSD % Recov 90 90 90 95 97 <br /> RPD 57 00 00 00 00 <br /> RPD Limit. 0-20 0-20 0-20 0-20 0-50 <br /> LCS # LCS060998 LCS060998 LCS060998 LCS060998 LCS060998 <br /> Prepared Date 6/9/98 6/9/98 6/9/98 6/9/98 6/9/98 <br /> Analyzed Date 6/9/98 6/9/98 6/9/98 6/9/98 6/9/9$ <br /> Instrument I D# HP5 HP5 HP5 HP5 HP5 <br /> Conc Spiked 20pg/L 20pg/L 20pg/L 60pg/L 310pg/L <br /> LCS Result 21 22 22 67 300 <br /> LCS % Recov 105 110 110 112 97 <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 /> SEQUOIA ANALYTICAL The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> lap#1271 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 /> yuan Klmyal <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 9806259 AAA <1> <br />