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Sequoia 680 Chesapeake Drive Redwood Cary CA 94063 (650) 364-9600 FAX(650)3649233 <br /> 404 N Wxget Lane Walnut Creek CA 94598 (510)988-9600 FAX(510)988-9613 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)92t-0100 <br /> vo- Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707) 792-1865 FAX(707)792-0342 <br /> Cambria Client Project ID Shell 2494 Fremont <br /> 1144 65th St Ste C <br /> Oakland, CA 94608 <br /> Attention Mike Murphy QC Sample Group 9805086-01-05 Reported May 18, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Solid <br /> Method EPA 8015/8020 <br /> Analyst R GECKLER <br /> ANALYTE Gasoline <br /> QC Batch# GC051298BTEXEXA <br /> Sample No GS9805D91-2 <br /> Date Prepared 5/12198 <br /> Date Analyzed 5/12/98 <br /> Instrument I D# GCHP1 <br /> ample Conc , mg/Kg N D <br /> Conc Spiked, mg/Kg 50 <br /> Matrix Spike, mg/Kg 42 <br /> %Recovery 84 <br /> Matrix t� <br /> like Duplicate, mg/Kg 45 <br /> %Recovery 90 <br /> elative%Difference 69 <br /> RPD Control Limits 0-25 <br /> GSBLK051298A <br /> LCS Batch# <br /> Date Prepared 5/12198 <br /> Date Analyzed 5/12198 <br /> instrument i D`#=GCHP1 <br /> Conc Spiked, mg/Kg 50 <br /> Recovery, mg/Kg 48 <br /> LCS %Recovery 96 <br /> Percent Recovery Control Limits <br /> MSIMSD 60-140 <br /> 17 LCS 70-130 <br /> Quality Assu a 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 /> U AA LYTICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> led 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 recovery is to be used to validate the batch <br /> eggy Penner <br /> Project Manager <br />