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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 /> Analytica 819 Striker Avenue Suite 8 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 Environmental Tech Client Project ID Shell 341 E Main <br /> 1144 65th St, Ste C Matrix Solid <br /> Oakland, CA 94608 <br /> Attention Paul Waite Work Order# 98031=79 08 Reported Apr 10, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Methanol Ethanol lso-Propanol <br /> QC Batch# GCO323981SHSHSB GCO325981SHSHSB G00325981SHSHSB <br /> Analy Method ISHS ISHS ISHS <br /> Prep Method HS HS HS <br /> Analyst T Sears T Sears T Sears <br /> MS/MSD# 980395701 98031`7901 9803F7901 <br /> Sample Conc N D N D N D <br /> Prepared Date 3/23/98 3/25/98 3/25/98 <br /> Analyzed Date 3/23/98 3/25/98 3/25/98 <br /> Instrument I.D# GCV1 GCV1 GCV1 <br /> Conc Spiked 8 0 mg/Kg 8 0 mg/Kg 8 0 mg/Kg <br /> Result, 74 79 79 <br /> MS %Recovery 93 99 99 <br /> Dup Result 79 89 88 <br /> MSD % Recov 99 i 11 110 <br /> RPD 65 12 11 <br /> RPD Limit 0-50 0-50 0-50 <br /> LCS# BLK032598 BLK032598 BLK032598 <br /> Prepared Date 3/25/98 3/25/98 3/25/98 <br /> Analyzed Date 3/25/98 3/25/98 3/25/98 <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 76 85 85 <br /> LCS % Recov 95 106 106 <br /> LCS <br /> Control Limits 70-130 70.130 70-130 <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 spec+fied control limits due to matrix <br /> Richard H�erlVininterference,the LCS recovery is to be used to validate the batch <br /> Richard Herlin <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9803F79 CCC <7> <br />