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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> -Blaine Tech Services, Inc Client Project ID -Shell Stockton /971121-G2 <br /> 1680 Rogers Ave Matrix Liquid <br /> .San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9711 E94-03, 05 Reported Dec 12, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Methanol Ethanol Iso-Propanol <br /> QC Batch# GC1201971SHSHSA GC1201971SHSHSA CC1201971SHSHSA <br /> Analy Method ISHS ISHS ISHS <br /> Prep Method Hs HS HS <br /> Analyst T Tran T Tran T Tran <br /> MS/MSD#. 971108303 971108303 971108303 <br /> Sample Conc. N D N D N D <br /> Prepared Date 12/1/97 12/1/97 12/1/97 <br /> Analyzed Date 12/1/97 12/1/97 12/1/97 <br /> Instrument I D # GCV1 GCv1 GCv1 <br /> Conc Spiked 8 0 mg/L 8 0 mg/L 8 0 mg/L <br /> Result- 79 87 84 <br /> 46S % Recovery 99 109 105 <br /> Dup Result 78 85 81 <br /> MSD %Recov 98 106 101 <br /> RPD 13 23 36 <br /> RPD Limit 0-50 0-50 0-50 <br /> LCS # BLK120297 BLK120297 BLK120297 <br /> Prepared Date- 12/2/97 12/2/97 12/2/97 <br /> Analyzed Date 12/2/97 12/2/97 12/2/97 <br /> Instrument I D.# GCv1 GCv1 GCv1 <br /> Conc Spiked: 8 0 mg/L 8 0 mg/L 8 0 mg/L <br /> LCS Result 82 8 4 81 <br /> LCS % Recov 103 105 101 <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 /> IA AN LYTICAL 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 /> eg nner <br /> P eet Manager *"MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 9711E94 BLA <6> <br />