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Sequoia 680 Chesapeake Drive 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 B Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Cambria Client Project ID Shell 2494 Fremont <br /> 270 Perkins Ave Matrix Solid <br /> Sonoma, CA 95476 <br /> Attention Mike Murphy Work Order# 9805086 -01-02, 04 Reported May 20, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Methanol Ethanol Iso-Propanol <br /> QC Batch# GCO513981SHSHSB GCO513981SHSHSB GC0513981SHSHS13 <br /> Analy Method ISHS ISHS ISHS <br /> Prep Method HS HS HS <br /> Analyst T Sorokin T Sorokin T Sorokin <br /> MS/MSD # 980509101 980509101 980509101 <br /> Sample Conc N D N D N D <br /> Prepared Date 5/13/98 5/13/98 5/13/98 <br /> Analyzed Date 5/13/98 5/13/98 5/13/98 <br /> Instrument I D # GCv1 GCv1 GCV1 <br /> Conc Spiked 8 0 mg/Kg 8 0 mg/Kg 8 0 mg/Kg <br /> Result 10 11 11 <br /> MS % Recovery 125 138 138 <br /> Dup Result 84 91 90 • <br /> MSD % Recov 105 114 113 <br /> RPD 17 19 20 <br /> RPD Limit 0-50 0-50 0-50 <br /> LCS # BLK051498 BLK051498 BLK051498 <br /> Prepared Date 5/14/98 5/14/98 5/14/98 <br /> Analyzed Date 5/14/98 5/14/98 5/14/98 <br /> Instrument I D # GCv1 GCv1 GCv1 <br /> Conc.-Spiked. 8 0 mg/Kg 8 0 mg/Kg 8 0 mg/Kg <br /> LCS Result 63 66 64 <br /> LCS % Recov 79 83 80 <br /> 50-150 50-150 50-150 <br /> LCS 70-130 70-130 70-130 <br /> Control Limits <br /> Please!Vote <br /> The LCS is a control sample of known, interferent-fres matrix that is analyzed using the same reagents <br /> DggI ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sampl <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure I <br /> the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> enner <br /> Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative% Difference 9805086 CCG ¢1> <br />