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S�q l l®la 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> equoia 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 /> 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 /> 114465th St, Ste C Matrix Solid <br /> Oakland, CA 94608 <br /> Attention Paul Waite Work Order# 9803F79 01, 03, 04, 07 Reported Apr 10, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Methanol Ethanol Iso-Propanol <br /> QC Batch#' GC0325981SHSHSB GC0325981SHSHSB GCO3259818HSHSB <br /> Analy Method ISHS ISHS ISHS <br /> Prep Method HS HS HS <br /> Analyst T Sears T Sears T Sears <br /> MS/MSD # 9803177901 9803177901 9803F7901 <br /> Sample Conc. N D N D N D <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/lig 8 0 mg/Kg <br /> Result 10 12 11 <br /> MS % Recovery 125 150 138 <br /> Dup Result 11 12 12 <br /> MSD %Recov 138 150 150 <br /> RPD 95 00 87 <br /> RPD Limit 0-50 0-50 0-50 <br /> LCS# BLK032598 8LK032598 BLKD32598 <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 80 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 /> 0SEQUOIA 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 /> `JS+JJ 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 /> Richard Herli <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9803F79 CCC <6> <br />