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680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 rAX(650) 364-9233 <br /> Sequoia 404 N Wiget lane Walnut Creek CA 94598 (510)988-9600 FAX(510)988-9673 <br /> Analytical 14 McDowell <br /> 5Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Bivd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Gettler Ryan/Geostrategies Client Project ID Unocal 5421, Stockton <br /> 6747 Sierra Court, Ste J Matrix Solid <br /> Dublin, CA 94568 <br /> Attention Clyde Galantine Work Order# 9804B92-10 Reported May 8, 3998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Lead <br /> QC Batch# ME042798601OMDA <br /> Analy Method EPA 7420 <br /> Prep Method EPA 3050 <br /> Analyst K Anderson <br /> MS/MSD # 8041420 <br /> Sample Conc 38 <br /> Prepared Date 4/27/98 <br /> Analyzed Date 4/28/98 <br /> Instrument I D # Mv1 <br /> Conc Spiked 50 mg/Kg <br /> Result 42 <br /> MS % Recovery- 76 <br /> Dup. Result 43 <br /> MSD % Recov 78 <br /> RPD 24 <br /> RPD Limit 0-20 <br /> LCS # LCSO42798 <br /> Prepared Date 4/27/98 <br /> Analyzed Date 4/28/98 <br /> Instrument I D # Mvt <br /> Conc Spiked 50 mg/Kg <br /> LCS Result 43 <br /> LCS % Recov as <br /> 75-125 <br /> LCS 60-120 <br /> Control Limits <br /> Please Note <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known, interferent-free matrix that is analyzed using the same reagents, <br /> . Elap#13T1 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 rnatrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> fregory <br /> r ect Manager ""MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9804B92 GET <2> <br />