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w 4 <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wlget 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 /> Gettler Ryal;vGeostrategles Client Project ID Unocal S8#5417, 180179 85 <br /> `6747 Sierra Court, Ste J Matrix Liquid r <br /> <'Dublln, 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#. MS113098MTSEH6A <br /> Analy. Method: EPA 8260 <br /> Prep. Method: <br /> Analyst: L Zhu <br /> MS/MSD # 9811A0002 <br /> Sample Cone. N D <br /> Prepared Date 11/30/98 <br /> Analyzed Date 11/30/98 <br /> Instrument LD # H6 <br /> Cone Spiked 50 pg/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 /> Cone Spiked. 50,vg/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 if <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 /> ahicher <br /> %roject Manager **MS-Matrix Spike, MSD-MS Duplicate, RPD-Relative%Difference 9811A00 GET <2> <br />