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Seq,>� oia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364u-9211 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> ']�/ 3 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> 1551 Industrial Road San Carlos,CA 94070-4111 (650)232-9600 FAX(650)232 9612 <br /> Sequoia Analytical Client Project lD L904098 /Shell COC#990408-G2 <br /> 1551 Industrial Road Matrix Liquid . <br /> San Carlos, CA 94070 r <br /> Attention M Gregory Work Order# 9904687 -01-04 Reported Apr 22, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte. Methanol Ethanol Iso-Propanol <br /> QC Batch#- CC0420991SHSHSB GCO420991SHSHSB GC042099]SHSHSB <br /> Analy Method ISHS ISHS ISHS <br /> Prep Method HS HS HS <br /> Analyst MM M M MM <br /> MS/MSD # 990468703 990468703 990468703 <br /> Sample Conc. N D N D N D <br /> Prepared Date 4/20/99 4/20/99 4/20/99 <br /> Analyzed Date 4/20/99 _ 4/2:0/99 4/20/99 <br /> Instrument I D # GCV1 GCV1 GCV1 <br /> Conc Spiked 8 0 mg/L 8 0 mg/L 8 0 mg/L <br /> Result- 93 11 11 <br /> MS % Recovery 116 138 138 <br /> Dup Result 84 99 10 <br /> MSD % Recov 105 124 125 <br /> RPD 10 11 95 <br /> RPD-Limit 0-50 0-50 050 <br /> LCS # LCSO42099 LCSO42099 LCSO42099 <br /> Prepared Date: 4/20/99 4/20/99 4/20/99 <br /> Analyzed Date- 4/20/99 4/20/99 4/20/99 <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 _ - 83 _ 91-- _ 92 <br /> LCS % Recov 104 114 115 <br /> 50-150 50-150 50-150 <br /> LCS 70-130 r 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 /> / 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 /> Ka an K1 i <br /> Project Wanager **IVIS=Matrix Spike,MSD=MS Duplicate,RPD=Relative% Difference 9904687 SSS <i> <br />