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f 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 /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(9 16)921-0100 <br /> 1455 McDowell Blvd north Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br />' EA Engineering Client Project ID Exxon 7-0137, 5150137 1300 <br /> 3468 Mt Diablo Blvd, Ste 6100 <br /> Lafayette, CA 94549 <br />' Attention Chnsta Marting QC Sample Group 9807DO8-04,05,07,08 Reported Aug 3, 1998 <br /> QUALITY CONTROL DATA REPORT <br />' Matrix Liquid <br /> Method EPA 8015 <br />' Analyst G Peshina <br /> ANALYTE Gasoline <br />' QC Batch # GC0729986TEX18A <br /> Sample No GW9807E66-3 <br /> Date Prepared 7129198 <br />' Date Analyzed 7/29198 <br /> Instrument 1 D # GCHP18 <br /> Sample Cone , ug/L N D <br />' Conc Spiked ug/L 250 <br /> Matrix Spike ug/L 210 <br /> % Recovery 84 <br /> Matrix <br /> Spike Duplicate, ug/L 210 <br /> % Recovery 84 <br /> Relative % Difference 00 <br />' RPD Control Limits 0-25 <br /> LCS Batch# GWBLK072998A <br />' Date Prepared 7129/98 <br /> Date Analyzed 7/29198 <br /> Instrument 1 D # GCHP18 <br />' Cone Spiked, ug/L 250 <br />' LCS Recovery ug/L 210 <br /> LCS % Recovery 84 <br /> Percent Recovery Control Limits <br />' MSIMSD 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 /> ortihed 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 recover is to be used to validate the batch <br /> Ichard Herling <br /> Project Manager <br /> 1 <br />