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Sequoia 404 N WDLane <br /> Walnut Creels CAA 9459$ <br /> 4 (925) 988-9600 <br /> Analytical FAX(925)988-9673 <br /> Imettler-kyan - Dublin Client Project ID Tosco# 6981, Stockton <br /> 3164 Gold Camp Drive#240 Matrix Vapor <br /> Rancho Cordova, CA 95670 <br /> Attention Mike Mitchener OC Sample Group 908440 Reported Sep 7, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> OC Batch# GCO82099 GC082099 GCO82099 GCO82099 <br /> 802002A 802002A 802002A 802002A <br /> Anally Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst C Westwater C Westwater C Westwater C Westwater <br /> MS/MSD # 100 NG BTEX 100 NO BTEX 100 NG BTEX 100 NG BTEX <br /> Sample Cone 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 8/20/99 8/20/99 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> Cone Spiked 20ug/L 20pg/L 2Opg/L 60yg/L <br /> Result 13 10 0 91 2 9 <br /> MS% Recovery 65 50 46 48 <br /> • Dup Result 1 4 10 10 29 <br /> MSD % Recov 70 50 50 48 <br /> RPD 74 00 94 00 <br /> RPD Limit 0-20 0-20 0-20 0-20 <br /> LCS # 2LCS082099 2LC8082099 2LCS082099 2LCS082099 <br /> Prepared Date 8/20/99 8/20/99 8/20/99 8/20/99 <br /> Analyzed Date 8/20/99 8/20/99 8/20/99 8/20/99 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> Cone Spiked. 2 0 pg/L 2 0 pg/L 2 0 ug/L 6 0 frg/L <br /> LCS Result 19 17 20 59 <br /> LCS % Recov 95 85 100 98 <br /> LCS 70.130 70-130 70-130 70-130 <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 ANALYTICAL, #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 /> ,� ll 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 /> ulianne Fegley *"MS-Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference <br /> Project Manager <br /> W908440 GET <2> <br />