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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 /> triker Avenue Suite$ Sacramento 95834 ( )921-9600 FAX(917)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma 9 CA 94954 (707707)792-1865 FAX(707)792-0342 <br /> Analytical 819s <br /> 'Gettler Ryan/Geostrategies Client Project ID v 180138 85/6981, 4707 Pacific M <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 981OB87 01-12 Reported Nov 4, 1998 <br /> 981OB89 13 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE MTBE MTBE <br /> OC Batch# MS102398MTBEH6A MS102498MTSEH6A MS102298MTBEH6B <br /> Analy Method. EPA 8260 EPA 8260 EPA 8260 <br /> Prep Method <br /> Analyst. M Williams L.Zhu T Castillo <br /> MS/MSD #- 981OB8704 981068004 980911504 <br /> Sample Conc. 10 N D 31 <br /> Prepared Date. 10/23/98 10/24/98 10/22/98 <br /> Analyzed Date 10/23/98 10/24/98 10/22/98 <br /> Instrument I D # H6 H6 H6 <br /> Conc. Spiker 50Mg/L 50pg/L 50pg/L <br /> Result 55 42 74 <br /> MS %Recovery 90 64 86 <br /> . Dup Result 52 45 76 <br /> MSD% Recov 84 90 90 <br /> RPD. 5 6 69 27 <br /> RPD Limit 0-25 0-25 0-25 <br /> f LCS#. LCS102398 LCS102598 LCS102698 <br /> Prepared Date N A. N a NA. <br /> Analyzed Date 10/23/98 10/25/98 10/26/98 <br /> Instrument I D # H6 HS H6 <br /> Conc. Spiked- 50ltg/L 50,ug/L 50Yg/L <br /> LCS Result 43 43 2400 <br /> LCS% Recov.: 86 86 96 <br /> 60-140 60-140 60.140 <br /> LCS 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 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 /> r� 1 interference,the LCS recovery is to be used to validate the batch <br /> Tod Granicher <br /> Project Manager ""MS-Matrix Spike,MSD-MS Duplicate,RPD=Relative%Difference 9810B87 GET <3> <br />