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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)36A 9233 <br /> 404 N Wiget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 8it <br /> 19 Striker Avenue Sue 8 Sacramento CA 95834 (916)921-9600 FAX(916)921 OE00 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707) 792-1865 FAX(707)792 0342 <br /> EA Engineering Science & Tech Client Project ID Exxon 7-3942, 5153942 1300 <br /> 3468 Mt Diablo Blvd Ste B100 <br /> Lafayette, CA 94549 <br /> IAttention C1ri51a Martin, QC Sample Group 9811 D71 21 Reported Dec 3, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst AM <br /> ANALYTE Gasoline <br /> GC Batch # GC112798BTEX30A <br /> Sample No GW9811F45-01 <br /> Date Prepared 11/26/98 <br /> Date Analyzed 11/26/98 <br />' Instrument 1 D # GCHP30 <br /> Sample Conc , ug1L N D <br /> Conc Spiked ug1L 250 <br /> Matrix Spike ug/L. 260 <br /> % Recovery 102 <br /> Matrix <br /> Spike Duplicate, uglL 220 <br /> % Recovery 88 <br /> Relative % Difference 15 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GC112798BTEX30A <br />' Date Prepared 11/27/98 <br /> Date Analyzed 11/27/98 <br /> Instrument I D # GCHP30 <br />' Conc Spiked ug/L 250 <br /> LCS Recovery, ugJL 230 <br />' LCS % Recovery 92 <br /> Percent Recovery Control Limits <br /> MS/MSD 60140 <br />' LCS 70130 <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 /> rortified with known quantities of specific compounds and subjected to the entire analytical procedure It <br /> the recovery of analytes from the matrix spike does not fall within specified controf limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> Rebecca Strait <br /> Project Manager <br /> 1 <br />