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4 N <br /> gLane <br /> Sequoia Walnut OCrreek CIA 94598 <br /> 4 (925)988-9600 <br /> Analytical FAX(925)988-9673 <br /> settler-Ryan - Dublin Client project ID Tosca #6981, Stockton <br /> 3164 Gold Camp Drive, #240 Matrix Vapor <br /> Rancho Cordova, CA 95670 <br /> Attention Mike Mitchener OC Sample Group 908467 Reported Sep 8, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GCO82099 GCO82099 GCO82099 GCO82099 <br /> 802002A 802002A 802002A 802002A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> ria yst C Westwater C Westwater C Westwater C Westwater <br /> MS/MSD # 100 NG BTEX 100 NG BTEX 100 NG BTEX 100 NG BTEX <br /> Sample Conc N D N D N D N D <br /> Prepared Date 8/20/99 8/20/99 8/20/99 8/20/99 <br /> Analyzed Date 8/20/99 8/20/99 8/20/x9 8/20/99 <br /> Instrument I D # HP 2 HP 2 HP-2 HP-2 <br /> Conc Spiked 20pg/L 20yg/L 20vg/L 60ug/L <br /> Result 13 10 091 29 <br /> MS % Recovery 65 50 46 48 <br /> • Dup Result 14 10 10 29 <br /> MSD % Recov 70 5o 50 48 <br /> RPD 74 00 94 00 <br /> RPD Limit 0-20 0-20 020 0-20 <br /> LCS # 2LCS082599 2LCS082599 2LCS082599 2LCS082599 <br /> Prepared Date 8/25/99 8/25/99 8/25/99 8/25/99 <br /> Analyzed Date 8/25/99 8/25/99 8/25/99 8/25/99 <br /> Instrument I D # HP 2 HP-2 HP-2 HP-2 <br /> Conc Spiked 20Ng/L 20pg/L 20vg/L 60ug/L <br /> LCS Result 18 17 17 59 <br /> LCS %Recov 95 85 85 97 <br /> LCS 70-130 70-130 70-130 70130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,Interferent-free matrix that Is analyzed using the same reagents, <br /> SEQUOIA ANALYTI AL, #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 /> Janne Fegley "*MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference <br /> Project Manager <br /> W908467 GET <2> <br />