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• 680 Chesapeake Drive Redwood City CA 94063 (650)364 9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 619 Striker Avenue Suite S Sacrament CA 95834 (916)921 9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 1551 Industrial Road San Carlos CA 94070 4111 (650)232-9600 FAX(650)232 9612 <br /> Ovironmental resolutions Client Project it) ERI 205504T7/Yosco#5886 <br /> 74 Dlgrtal Dr, Ste 100 Matrix Vapor <br /> Novato, CA 94949 <br /> Attention Keith Romstad QC Sample Group 9050545-547 Reported May 21, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> i <br /> Analyte Benzene Toluene Ethyl Xylenes MTBE <br /> Benzene <br /> QC Batch# GCO51399 GCO51399 GC051399 GCO51399 MS051399 <br /> 802002A 802002A 802002A 802002A 8260$2A <br /> Analy. Method EPA 8020 EPA 8020 EPA 6020 EPA 8020 EPA 8260 <br /> Prep. Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> AnalystJ Minkel J Minkel J Minkel J Minkel N Nelson <br /> MS/MSD # 10ONG BTEX 10ONG BTEX 10ONG BTEX 100NG BTEX LCS051399 <br /> Sample Conc - N D N D N D N D N D <br /> Prepared Date 5/13/99 5/13/99 5/13/99 5/13/99 5/13/99 <br /> Analyzed Date. 5/13/99 5/13/99 5/13/99 5/13/99 5/13/99 <br /> Instrument LD # HP-2 HP 2 HP-2 HP-2 GC/MS-2 <br /> Conc Spiked 2 0 jig/L 2 0yg/L 2 Dug/L 6 0 ug/L 5 aug/L <br /> Result is 17 17 54 53 <br /> MS %Recovery 90 85 85 90 106 <br /> Dup Result 19 17 18 57 57 <br /> SD %Recov 95 85 90 95 114 <br /> RPD 54 00 57 54 75 <br /> RPD Limit 0-20 0-20 0-20 0-20 0-25 <br /> LCS # 2LC8051399 2LCS051399 2LCS051399 2LCS051399 - <br /> Prepared Date 5/13/99 5/13/99 5/13/99 5/13/99 - <br /> Analyzed Date 5/13/99 5/13/99 5/13/99 5/13/99 - <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> Conc. Spiked 20ug/L 20ug/L 20ug/L 60ug/L <br /> LCS Result 18 17 17 57 <br /> LCS % Recov. 90 85 85 95 <br /> LCS 70-130 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 /> tA <br /> QUOIA 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 H <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recoveryis to be used to validate the batch <br /> torector MS= atrix pike,M D=MS Duplicate,RPD=Relative%Difference <br /> 9050543 ENR <9> <br /> TR <br />