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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650) 364-9233 <br /> 404 N Wlget Lane Walnut Creek CA 94598 (9Z5)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)911-0100 <br /> %07 Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> ATC Associates, Inc Client Project ID Gardner Prop 62586 0001-04 <br /> 1117 Lone Palm Avenue <br /> Modesto, CA 95351-1502 <br /> Attention Torn Lutterman QC Sample Group 9812F34-03 Reported Jan 11 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst MM <br /> ANALYTE Gasoline <br /> QC Batch # GCO10699BTEX03A <br /> Sample No GW9812131-2 <br /> Date Prepared 116199 <br /> Date Analyzed 1/6/99 <br /> Instrument I D # GCHP03 <br /> Sample Conc ug/L N D <br /> Conc Spiked ug/L 250 <br /> Matrix Spike, ug/L 260 <br /> % Recovery 106 <br /> Matrix <br /> Spike Duplicate uglL 270 <br /> % Recovery 108 <br /> Relative % Difference 1 9 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GCO10699BTEX03A <br /> Date Prepared 116199 <br /> Date Analyzed 116199 <br /> Instrument 1 D # GCHP03 <br /> Conc Spiked ug/L 250 <br /> LCS Recovery uq/L 270 <br /> LCS % Recovery 108 <br /> Percent Recovery Control Limits <br /> F- <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 /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure 4 <br /> the recovery of analytes from the matrix spike does not fall withm specified control limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> Kayvan Kimy-al---- <br /> Project Manager/'— <br /> c <br /> .fes <br />