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a— ) 680Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 NWiget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical <br /> 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 Ryan/Geostrategles Client Project ID Former Unocal Facility#5098 n , <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order # 9809909 01-10 Reported Oct 9, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE MTBE <br /> CSC Batch# MS092398MTBEH6A MS092398MT13EH6A <br /> Analy Method EPA 8260 EPA 8250 <br /> Prep Method <br /> Analyst B Pitamah B Pitamah <br /> MS/MSD# 980992002 980992002 <br /> Sample Cone N 0 N D <br /> Prepared Date 9/23/98 9/23/98 <br /> Analyzed Date 9/23/98 9/23/98 <br /> Instrument I D # H6 H6 <br /> Cone Spiked 50 erg/L 50 yg/L <br /> Result 43 43 <br /> MS % Recovery 86 86 <br /> Dup Result 44 44 <br />. MSD % Recov 88 88 <br /> RPD 23 23 <br /> RPD Limit 0-25 0-25 <br /> LCS # LCS092598 LCS092398 <br /> Prepared Date 9/25/98 9/23/98 <br /> Analyzed Date 9/25/98 9/23/98 <br /> Instrument I D # H6 H6 <br /> Cone Spiked 50,ug/L 50ug/L <br /> LCS Result 47 44 <br /> LCS % Recov 94 88 <br /> 60-140 60-140 <br /> LCS 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 /> 0 . 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 /> Tad Granlcher <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,APD-Relative%Difference 9809909 GET <3> <br /> �T i <br />