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Q Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane 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)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> N A M1 <br /> Gettler Ryan/Geostrategles Client Project ID Unocal SS#5417, 180179 85 <br /> ,6747 Sierra Court, Ste J Matrix Liquid rj <br /> *,Dublin, CA 94568 <br /> 'Attention Deanna Harding Work Order# 9811A00 02-04 Reported Dec 17, 1998, <br /> QUALITY CONTROL DATA REPORT <br /> Analyte. MTBE <br /> QC Batch#: MS113098MTBEH6A <br /> Analy Method EPA 8260 <br /> Prep Method <br /> Analyst L Zhu <br /> MS/MSD #• 9811AO002 <br /> Sample Conc : N D <br /> Prepared Date 11/30/98 <br /> Analyzed Date 11/30/98 <br /> Instrument 1 D # H6 <br /> Conc Spiked 50 ug/L <br /> Result. 49 <br /> MS % Recovery 98 <br /> Dup Result 50 <br /> MSD % Recov 100 <br /> RPD: 20 <br /> RPD Limit: 0-25 <br /> LCS # LCS113098 <br /> Prepared Date: 11/30/98 <br /> Analyzed Date: 11/30/98 <br /> Instrument I D #• H6 <br /> Conc Spiked, 50u9/L <br /> LCS Result 51 <br /> LCS % Recov : 102 <br /> 60-140 <br /> LCS 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 M <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 /> picer <br /> roject Manager *'MS-Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9811A00 GEC <2> <br /> I <br /> sx� <br />