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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 (92 5)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> v 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Cambria Environmental Client Project ID Shell 341 E Main St <br /> 1144 65th St, Ste C Matrix Solid <br /> Oakland, CA 94608 <br />' Attention Owen Ratchye Work Order# 9807C66-02-04 Reported Aug 4, 1998 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte Methanol <br /> QC Batch# GC07249SISHSHSD <br /> Analy Method ISHS <br /> Prep Method HS <br />' Analyst T Sorokin <br /> MS/MSD#• 9807C6601 <br /> Sample Conc N D <br />' Prepared Date 7/23/98 <br /> Analyzed Date 7/23/98 <br /> Instrument I D # GCv1 <br /> Conc Spiked 8 0 mg/Kg <br /> Result 68 <br /> MS %Recovery 85 <br /> Dup Result 69 <br /> MSD% Recov 86 <br />' RPD 15 <br /> RPD Limit 0-50 <br /> LCS# LCS072498 <br />' Prepared Date 7/24/98 <br /> Analyzed Date 7/24/98 <br /> Instrument LD # GCv1 <br /> Conc Spiked 8 0 mg/Kg <br /> LCS Result 87 <br /> LCS % Recov 109 <br /> 50-150 <br /> LCS 70-130 <br /> IControl Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> A ALYTICAL 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 /> P ggy ginner <br /> Pr le t Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9807066 CCC <4> <br />