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I ® Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95634 (916)921-9600 FAX(916)921-0100 <br /> Analytical I i 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)79Z-0342 <br /> 17Cambria Client Protect ID Shell 341 Main St <br /> th St , Ste C <br /> , CA 94608 <br /> n Owen Ratchye QC Sample Group 9807C66-01-04 Reported Aug 4, 1998 <br /> QUALITY CONTROL. DATA REPORT <br /> Matrix Solid <br /> Method EPA 8015 <br /> Analyst G Peshina <br /> IANALYTE Gasoline <br /> QC Batch# GC072891111TEXEXA <br /> ISample No GS9807C66-4 <br /> Date Prepared 7128198 <br /> Date Analyzed 7128198 <br /> Instrument I D# GCHP18 <br /> ample Conc, mg/Kg N D <br /> Conc Spiked, mg/Kg 5 0 <br /> Matrix Spike,mg/Kg 43 <br /> %Recovery 86 <br /> 6 Matrix <br /> ke Duplicate,mg/Kg 48 <br /> Recovery 96 <br /> 1 <br /> elative% Difference 11 <br /> IRPD Control Limits 0-25 <br /> ILCS Batch# GSBLK072898A <br /> Date Prepared 7128198 <br /> Date Analyzed 7128198 <br /> Instrument I D# GCHP18 <br /> Conc Spiked,mg/Kg 50 <br /> I Recovery,mg/Kg 52 <br /> LCS%Recovery 104 <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 /> S AN LYTICAL 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 /> interference the LCS recoveryis to be used to validate the batch <br /> P gy P!!� er <br /> Pro c 4Vlana ler <br />