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680 Chesapeake Drive Redwood City CA 94063 (650)364-%00 FAX(650) 364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> � Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0E00 <br /> 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707) 792-0342 <br /> FAtTention <br /> sociates, Inc Client Project ID Westrec Proper/KIR 62514 0001 <br /> ne Palm Avenue <br /> , CA 95351-1502 <br /> Jeanne Homsey QC Sample Group 9903268 05,09 Reported Mar 24, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst BTF <br /> ANALYTE Gasoline <br /> QC Batch # GC031 8998TEX02A <br /> Sample No GW9903436-4MS <br /> Date Prepared 3118/99 <br /> Date Analyzed 3118/99 <br /> Instrument I D # GCHP02 <br /> Sample Conc , ug/L N D <br /> Conc Spiked ug/L 250 <br /> Matrix Spike, ug/L 220 <br /> Recovery 87 <br />�• Matrix <br /> Spike Duplicate, ug/L 210 <br /> % Recovery 85 <br /> Relative % Difference 2 3 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GWLCS031899A <br /> Date Prepared 3/18199 <br /> Date Analyzed 3118/99 <br /> Instrument I D # GCHP02 <br /> Conc Spiked uglL 250 <br /> LCS Recovery ug/L 210 <br /> LCS % Recovery 85 <br /> Percent Recovery Control Limits <br /> F- <br /> MS/MSD 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 fall within specified control limits due to matrix <br /> Iinterference the LCS recovery is to be used to validate the batch <br /> ayvan KI �I <br /> Project Manager <br />