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' 68u Chesapeake Drive Redwood City CA 940o3 (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$ Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Cambria Client Project ID Shell 420 W Kettleman Lane <br /> 1144 65th St Suite C <br /> Oakland, CA 94608 <br /> Attention Aubrey Coal QC Sample Group 9611146-01-09 Reported Nov 18, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Solid <br /> Method EPA 8015 <br /> Analyst R GECKLER <br /> ANALYTE Gasoline <br /> QC Batch # GC110698BTEXEXB <br /> Sample No 9811324-1 <br /> Date Prepared 1116198 <br /> Date Analyzed 1116198 <br /> Instrument I D # GCHP31 <br /> Sample Cone mglKg N D <br /> Cone Spiked mglKg 5 0 <br /> Matrix Spike, mglKg 15 <br /> % Recovery 300 <br /> Matrix <br /> Sike Duplicate, mg/Kg 6 6 <br /> % Recovery 132 <br /> Relative % Difference 78 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GC110698BTEXEXB <br /> Date Prepared 11/6/98 <br /> Date Analyzed 11/6/98 <br /> Instrument I D # GCHP31 <br /> Cone Spiked mg/Kg 5 0 <br /> Recovery, mg/Kg 5 5 <br /> LCS % Recovery 110 <br /> Percent Recovery Control Limits <br /> MSIMSD 60-140 <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 ANAL TICAL preparation and analytical methods employed for the samples The matnx spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analyticai procedure If <br /> the recovery of analytes from the matrix spike does not tall within specified control limits due to matrix <br /> / interference the LCS recovery is to be used to validate the batch <br /> nner <br /> Project Manager <br />