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680 Chesaeake Dnve Redwood Cry CA 94063 (650) 364-9600 FAX{650) 364-9233 <br /> Sequoia 4114 N Wigetplane Walnut Creek.CA 94598 (925)988-9600 FAX{925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)9Z1-0100 <br /> 11F* Analytical 1455 McDowell Blvd North Ste D retaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Gettler Ryan/Geostrategies Client Project fD Unocal SS#0123 <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order # 9809H50 02-05 Reported Nov 6, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch#• MS110298MTSEH6A <br /> Analy Method: EPA 8260 <br /> Prep Method <br /> Analyst: T Costello <br /> MS/MSD # 981OF8101 <br /> Sample Conc.. 37 <br /> Prepared Date* 11/2/98 <br /> Analyzed Date 11/2,10-8 <br /> Instrument I D.#: H6 <br /> Conc. Spiked: 50 mg/L <br /> Result: 49 <br /> MS % Recovery" 91 <br /> . Dup Result: 46 <br /> MSD % Recov. 85 <br /> RPD. 63 <br /> RPD Umdt- 0.25 <br /> LCS #- LCS110398 <br /> Prepared Date 11/3/98 <br /> Analyzed Date 11/3/98 <br /> instrument I D # H6 <br /> Conc Spiked 50 Ng/L <br /> LCS Result: 44 <br /> LCS % Recov 88 <br /> 60-140 <br /> LCS 7x-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 �nown quantities of specific compounds and subjected to the entire analytical procedure It <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 /> Tod Granicher <br /> Project Manager xx MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9809H50 GET <2> <br />