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680 Chesapeake Drive, Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Cambria Client Project ID Shell 341 Main St <br /> 1144 65th St , Ste C <br /> Oakland, CA 94608 <br /> Attention Owen Ratchye QC Sample Group 9807C66-01-04 Reported Aug 4, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Solid I <br /> Method EPA 8010 <br /> Analyst C Medina <br /> ANALYTE 1,1-DCE TCE Chlarobenzene <br /> QC Batch# GC0724980VOAEXA <br /> Sample No 98071363-01 I <br /> Date Prepared 7121198 7121198 7121198 <br /> Date Analyzed 7124198 7124198 7124198 <br /> Instrument I D# gchp09 gchp09 gchp09 <br /> ample Conc ,mg/Kg ND 14 N D <br /> Conc Spiked,mg/Kg 50 50 50 <br /> Matrix Spike,mg/Kg 41 63 43 <br /> % Recovery 82 98 86 <br /> Matrix <br /> ike Duplicate, mg/Kg 36 64 47 <br /> %Recovery 72 1000 94 <br /> elative% Difference 13 20 89 <br /> RPD Control Limits 0-25 0-25 0-25 <br /> LCS Batch# VSBLK072498A <br /> Date Prepared 7124198 7124198 7124/98 <br /> Date Analyzed 7/24198 7124198 7124198 <br /> Instrument I D# gchp09 gchp09 gchp09 <br /> - Conc Spiked,mg1Kg 50 50 50 <br /> Recovery,mg/Kg 42 64 44 <br /> LCS% Recovery 84 128 88 <br /> Percent Recovery Control Limits <br /> MS/MSD 65-135 70-130 70-130 <br /> LCS 65-135 70-130 70-130 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met 1 <br /> Please Note I <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> ANAL TICAL 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 recoveryis to be used to validate the batch <br /> Pe y ginner <br /> Prot Manager <br />