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Sequoia 660 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650) 364 9233 <br /> 404 N WiSet 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 0100 <br /> 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707 792 f865 FAX 707 792 0342 <br /> Delta Environmental Client Project ID Exxon 7 3708 D093-809 <br /> 3164 Gold Canip UI ive, #200 <br /> Rancho Cordova CA 95670 <br /> Attention Jim Brownell QC Sample Group 9812A76 Reported Jan 4 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst N H <br /> ANALYTE Gasoline <br /> OC Batch # GC122998BTEX1 7A <br /> Sample No 9812A76 2 <br /> Date Prepared 12129/98 <br /> Date Analyzed 12/29/98 <br /> Instrument I D # GCHP17 <br /> Sample Conc ug/L N D <br /> Conc Spiked u91L 250 <br /> Matrix Spike ug/L 220 <br /> % Recovery 88 <br /> Matrix <br /> Spike Duplicate ug/L 230 <br /> % Recovery 92 <br /> Relative % Difference 4 4 <br /> RPD Control Limits 0 26 <br /> LCS Batch# GC1229986TEX17A <br /> Date Prepared 12/29/98 <br /> Date Analyzed 12/29/98 <br /> Instrument I D # GCHP17 <br /> Conc Spiked ug/L 250 <br /> LCS Recovery ug/L 230 <br /> LCS % Recovery 92 <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 /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> EQUOIA ANALYTICAL preparation and analytical methods employed far 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 11 <br /> the recovery of analytes from the matrix spike does not call within specified control Omits due to matrix <br /> WonaldCMevvnterference the LCS recovery is to be used to valsdate the batch <br /> Chew <br /> Project Manager <br />