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Sequoia 60 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wi13et Lane Walnut Creek CA 94598 (925)988-9600 FAX(925),�988,9C7p <br /> 819 Striker Avenue Sulte 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 420 West Kettleman Lane . <br /> 270 Perkins Ave <br /> Sonoma, CA 95476 <br /> Attention Mike Murphy QC Sample Group 9903A47-01-10 Reported Apr 1, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Solid <br /> Method EPA 8015 <br /> Analyst N H <br /> ANALYTE Gasoline <br /> QC Batch# GC0324996TEXEXA <br /> Sample No 9903-8 <br /> Date Prepared 3124199 <br /> Date Analyzed 3124199 <br /> Instrument 10# GCHP18 <br /> ample Conc , mg/Kg 68 <br /> Conc Spiked, mg/Kg 50 MATRIX EFFECT <br /> Matrix Spike, mgJKg 100 <br /> % Recovery 64 <br /> Matnx <br /> ike Duplicate,mg/Kg 93 <br /> % Recovery 50 <br /> elative %Difference 25 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GC0324998TEXEXA <br /> Date Prepared 3124199 <br /> Date Analyzed 3124199 <br /> Instrument i D#* GCHP18 <br /> Conc Spiked, mg/Kg 50 <br /> Recovery, mg/Kg 57 <br /> LCS% Recovery 114 <br /> I <br /> Percent Recovery Control Limits <br /> MSIMSD 60140 <br /> LCS 70-130 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <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 fail within specified control limits due to matrix <br /> Kayv yai <br /> interference the LCS recovery is to be used to validate the batch <br /> Prol c Mana r <br />