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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650) 364-9233 <br /> D404 N Wiget Lane Walnut Creek CA 94598 (510)988-9600 FAX(510)988-9673 <br /> ! Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> ico 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Cambria Client Protect ID Shell 2494 Fremont • <br /> 270 Perkins Ave <br /> Sonoma, CA 95476 <br /> Attention Joe Neely QC Sample Group 9805091-01-02 Reported May 18, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Solid <br /> Method EPA 8015/8020 <br /> Analyst R GECKLER <br /> ANALYSE Gasoline <br /> QC Batch# GCO51298BTEXEXA <br /> Sample No GS9805D91-2 <br /> Date Prepared 5112198 <br /> Date Analyzed 5/12198 <br /> Instrument I D# GCHP1 <br /> ample Cone , mg1K9 N D <br /> Cone Spiked, mg/Kg 50 <br /> Matrix Spike, mg/Kg 42 <br /> %Recovery 84 <br /> Matrix <br /> ike 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 5112198 <br /> Date Analyzed 5112198 <br /> Instnfinent-I D#—GCHP1 <br /> Cone Spiked, mg/Kg 50 <br /> Recovery, mg/Kg 48 <br /> LCS%Recovery 96 <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 /> JPgyThe LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> JANN YTICAL 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 analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> terference the LCS recovery is to be used to validate the batch <br /> nneranager <br />