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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 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 /> �rill� Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Gettler Ryan/Geostrategies Client Project ID Unocal 2859, 280054 <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9809003 01-10 Reported Nov 23, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte 1,1-Dichloroethene Trichloroethene Benzene Toluene Chlera- <br /> benzene <br /> QC Batch,# VBLKLCS VBLKLCS VBLKLCS VBLKLCS VBLKLCS <br /> Analy Method EPA 8260 EPA 8260 EPA 8260 EPA 8260 EPA 8250 <br /> Prep Method <br /> Analyst NA NA NA NA NA <br /> MS/MSD # BLK091198 BLK091198 BLK091198 BLK091198 BLK091198 <br /> Sample Cone N D N D N D N D N D <br /> Prepared Date 9/11/98 9/11/98 9/11/98 9/11/98 9111/98 <br /> Analyzed Date 9/11/98 9/11/98 9/11/98 9/11/98 9/11/98 <br /> Instrument I D # N A N A N A N A N A <br /> Cone Spiked 5 0 Ng/L 5 0 pg/L 5 0 vg/L 5 0 ug/L 5 0 ug/L <br /> Result 58 46 -•6 46 - ' <br /> .MS % Recovery 116 92 92 92 <br /> pup Result 57 48 46 47 "8 <br /> MSD % Recov 114 96 92 94 96 <br /> RPD 17 43 ao 22 21 <br /> RPD Limit 0-15 0-15 0-15 015 0-15 <br /> LCS # LCS091198 LCS091198 LCS091198 LCS091198 LCS091199 <br /> Prepared Date 9/11/98 9/11/98 9/11/98 9/11198 8/11/98 <br /> Analyzed Date 9/11/98 9/11/98 9/11/98 9/11/98 9/11/98 <br /> lnstrunrient I D # NA NA N A NA NA <br /> Cone Spiked 5 0 fig/L 5 0 fug/L 5 0 yg/L 5 Oyg/L 5 0 pg/L <br /> LCS Result 56 47 49 46 47 <br /> LCS %Recov 112 94 92 92 93 <br /> 79133 85-117 88124 88-122 88-117 <br /> LCS 79-133 85 117 88-124 88-122 88-117 <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 /> OSEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> ELAP #2245 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 /> Tod Granlcher *'MS=Matrix Spike,MSD=MS Duplicate,RPO=Relative%Difference <br /> Project Manager 9809003 GET <2> <br />