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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (9Z5)988-9600 FAX(925)988-9673 <br /> V07 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)792-0342 <br /> ATC Associates, Inc Client Project ID Westrec Prop /Kir 62514 0001 <br /> 1260 Graphics Drive Matrix Liquid <br /> Modesto, CA 95351-1502 <br /> Attention Jeanne Hornsey Work Order# 9806G74-05 Reported Jul 17, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> CC Batch# GCO71498802002A GC071498802002A GC071498802002A GC071498802002A GCO71498802002A <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 D Newcomb D Newcomb D Newcomb D Newcomb D Newcomb <br /> MS/MSD# 8070255 8070255 8070255 8070255 8070255 <br /> Sample Cane N D N D NO N D NO <br /> Prepared Date 7/14/98 7/14/98 7/14/98 7/14/98 7/14/98 <br /> Analyzed Date 7/14/98 7/14/98 7/14/98 7/14/98 7/14/98 <br /> Instrument 1.D # HP2 HP2 HP2 HP2 HP2 <br /> Cone Spiked 20ug/L 20pg/L 20pg/L 60pg/L 370pg/L <br /> Result. 20 19 21 61 340 <br /> MS% Recovery 100 95 105 102 92 <br /> Dup Result 20 19 19 60 340 <br /> MSD %Recov 100 95 95 100 92 <br /> RPD 00 00 10 17 00 <br /> RPD Limit 0-20 0-20 0-20 0-20 0-50 <br /> LCS# LCS071498 LCS071498 LCS071498 LC8071498 LCS071498 <br /> Prepared Date 7/14/98 7/14/98 7/14/98 7/14/98 7/14/98 <br /> Analyzed Date 7/14/98 7/14/98 7/14/98 7/14/98 7/14/98 <br /> Instrument I D # HP2 HP2 HP2 HP2 HP2 <br /> Conc. Spiked 20 ug/L 20pg/L 20pg/L 60pg/L 370pg/L <br /> LCS Result 19 19 19 58 330 <br /> LCS %Recov 95 95 95 97 89 <br /> 60-140 60.140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 60.140 <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 /> Elap#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 H <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 /> an Kim <br /> roject M ager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9806G74AAA <4> <br />