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Sequoia 11 Chesapeake Drive Redwood City CA 94063 (C>50) 364-9600 FAX(650) 364-9233 <br /> 404 N Wiget Lane Walnut Creek.CA 94598 (925)988 9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0[00 <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 /> Attention Chrlsta Marting QC Sample Group 9811 D70-01-06,09-10 Reported Dec 3, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Llquio <br /> Method EPA 8015 <br /> Analyst AM <br /> rANALYTE Gasoline <br /> QC Batch # GC112798BTEX02A <br /> Sample No GW981 1 F45-01 <br /> Date Prepared 11126/98 <br /> Date Analyzed 11/26/98 <br /> Instrument I D # GCHP02 <br /> Sample Conc ug/L N D <br /> Conc Spiked ug1L 250 <br /> Matrix Spike, ug/L 260 <br /> % Recovery 102 <br /> Matrix <br /> Spike Duplicate, ug/L 250 <br /> % Recovery 100 <br /> Relative % Difference 2 0 <br /> RPD Control Limits 0 25 <br /> LCS Batch# GC112798BTEX02A <br /> Date Prepared 11/27/98 <br /> Date Analyzed 11/27198 <br /> Instrument I D # GCHP02 <br /> Conc Spiked ug/L 250 <br /> LCS Recovery, ug/L 260 <br /> LCS % Recovery 104 <br /> Percent Recovery Control Limits <br /> r- MLCS 70140 <br /> LCS 70 13D <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 /> torufied with known quantities of specific compounds and subjected to the enure analytical procedure H <br /> the recovery of analytes from the matrix spike does not fall within specified control limas due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> Rebecca Strait <br /> Project Manager <br /> I <br />