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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 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-Ot00 <br /> 0 qQF 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 Homsey Work Order# 9806G74-01-04. 06 Reported Jul 17, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO70798802002A GCO70798802002A GCO70798802002A GCO70798802002A GCO70798802002A <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 C Westwater C Westwater C Westwater C Westwater C Westwater <br /> MS/MSD# 8062414 8062414 8062414 8062414 8062414 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 7/7/98 7/7/-98 7/7/98 7/7/98 7/7/98 <br /> Analyzed Date 7/7/98 7/7/98 7/7/98 7/7/98 7/7/98 <br /> Instrument LD #' HP2 HP2 HP2 HP2 HP2 <br /> Conc Spiked- 20 Ng/L 20 Mg/L 20 ftg/L 60 yg/L 320 Ng/L <br /> Result 21 21 23 68 340 <br />• MS% Recovery 105 105 115 113 106 <br /> Dup. Result 19 20 20 63 330 <br /> MSD % Recov 95 100 100 105 103 <br /> RPD 10 49 14 76 30 <br /> RPD Limit. 0-20 0-20 0-20 0-20 0-50 <br /> LCS#' LCS070798 LCS070798 LCS070798 LCS070798 LCS070798 <br /> Prepared Date 7/7/98 7/7/98 7/7/98 7/7/98 7/7/98 <br /> Analyzed Date 7/7/98 7/7/98 7/7/98 7/7/98 7/7/98 <br /> Instrument LD # HP2 HP2 HP2 HP2 HP2 <br /> Conc Spiked 20Yg/L 20erg/L 20pg/L 60frg/L 320lig/L <br /> LCS Result. 19 20 20 62 330 <br /> LCS % Recov. 95 100 100 103 103 <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 /> 0fortified with known quantities of specific compounds and subjected to the entire analytical'procedure If <br /> 1 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 /> Ka Kimyai <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative% Difference 9806G74 AAA <3> <br />