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r <br /> 680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> Sequoia <br /> 404 N Wiget Lane Walnut Creek,CA 94598 {510) 988 9600 FAX(510)988 9673 <br /> �Y1 Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Gettler Ryan/Geostrategies Client Project ID Unocal 6981, 7855 22 <br /> 3164 Gold Camp Drive, #240 Matrix Liquid <br /> Rancho Cordova, CA 95670 <br /> Attention Steve Carter Work Order# 9712694-03-07 Reported Dec 22, 1997> <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Methanol Ethanol Iso-Propanol <br /> QC Batch# GC1209971SHSHSB GC1209971SHSHSB GC1209971SHSHSB <br /> Analy Method ISHS ISHS ISHS <br /> Prep Method HS HS HS <br /> Analyst T Tran T Tran T Tran <br /> MS/MSD # 9711G1903 971161903 9711G1903 <br /> Sample Conc NO ND NO <br /> Prepared Date 12/9/97 12/9/97 12/9/97 <br /> Analyzed Date 12/9/97 12/9/97 12/9/97 <br /> Instrument I D # GCV1 GCV1 GCV1 <br /> Conc Spiked 8 0 mg/L 8 0 mg/L 6 0 m9/L <br /> Result 83 88 89 <br /> S %Recovery 104 110 111 <br /> 46 <br /> Dup Result 84 85 84 <br /> MSD % Recov. 105 106 105 <br /> RPD 12 35 58 <br /> RPD Limit 0-50 0-50 0-50 <br /> LCS # BLK121297 BLK121297 BLK121297 <br /> Prepared Date 12/12/97 12/12/97 12/12/97 <br /> Analyzed Date 12/12/97 12/12/97 12/12/97 <br /> Instrument 1 D # GCV1 GCv1 GCv1 <br /> Conc Spiked 8 0 mg/L 8 0 mg/L 8 0 mg/L <br /> LCS Result 85 85 85 <br /> LCS % Recov 106 106 106 <br /> 50-150 50-150 50-150 <br /> LCS 50-150 50-150 50-150 <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 /> Vct <br /> LYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> OF 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 /> r **MS Matrix Spike, MSD MS Duplicate, RPD Relative %Difference 9712694 GET <2> <br />