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- \ Sequoia680 Chcsapcake Drive Redwood City CA 94063 (650) 364 9600 FAX (650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)989 9673 <br /> i <br /> �all� Analytical 819 Striker Avenue Suite 9 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> fE A Engineering Science &Tech Client Project ID l=xxan 7-3942, 51539 42 1300 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br /> Lafayette, CA 94549 <br /> Attention Christa Marting Work Order# 9708E45-09, 13 Reported Sep 11, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GCO829978TEX22A GCO82997BTEX22A GC062997BTEX22A GCO82997BTEX22A GCO82997BTEX22A <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 R Geckler R Geckler R Geckler R Geckler R Geckler <br /> MS/MSD # 9708B9205 $)708B9205 9708B9205 9708139205 970889205 <br /> Sample Conc N D N D N D N D N D <br /> I Prepared Date 8/29/97 8/29/97 8/29/97 8/29/97 8/29/97 <br /> Analyzed Date 8/29/97 8/29/97 8/29/97 8/29/97 8/29/97 <br /> Instrument I D # GCHP22 GCHP22 GCHP22 GCHP22 GCHP22 <br /> Conc. Spiked 10ug/L 10ug/L 10ug/L 30pg/L 60ug/L <br /> Result 84 91 97 28 55 <br /> MS % Recovery 84 91 97 93 92 <br /> DLII} Result 76 83 88 25 50 <br /> MSD % Recov 76 83 88 83 83 <br /> RPD 10 92 97 11 95 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # BLK082997 BLK082997 BLK082997 BLK082997 BLK082997 <br /> Prepared Date 8/29/97 8/29/97 8/29/97 8/29/97 8/29/97 <br /> Analyzed Date 8/29/97 8/29/97 8/29/97 8/29/97 8/29/97 <br /> Instrument I D # GCHP22 GCHP22 GCHP22 GCHP22 GCHP22 <br /> Conc Spiked 10 ug/L 10 ug/L 10 ug/L 30 Ng/L 60 ug/L <br /> LCS Result 82 90 96 27 54 <br /> LCS % Recov 82 90 96 90 90 <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 /> f Please Note <br /> 1 The LCS Is a control sample of known,tnterferent-free matrix that is analyzed using the same reagents, <br /> EQUOIA ANALYTI AL 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 fail within specified control limits due to matrix <br /> Interference,the LCS recovery 1s to be used to validate the batch <br /> Richard Herling <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9708E45 EEE <4> <br />