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' 660 Chesapeake Drive Redwood Cfty CA 94063 650 364-9600 FAX(650) 364-9233 <br /> Sequoia ) <br /> 404 N Wlget Lane Walnut Creek CA 9459$ (9Z5)988-9600 FAX(925)9$8_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 1865 FAX(707) 792-0342 <br /> ' ATC Associates Inc Client Project ID 62574 0003/Sktn Five Station <br /> 1117 Lone Palm Avenue <br /> ' Modesto, CA 96351-1502 <br /> Attention Jeanne Hornsey QC Sample Group 9811 F27-01-02 Reported Dec 2 1998 <br /> ' QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> ' Analyst MM <br /> ANALYTE Gasoline <br />' QC Batch # GC112498BTEX02A <br /> Sample No GW981 1 D25-6 <br /> Date Prepared 11124198 <br />' Date Analyzed 11/24/98 <br /> Instrument I D # GCHP02 <br /> Sample Conc ug/L N D <br />' Conc Spiked ug/L 250 <br /> Matrix Spike ug/L 250 <br /> III Recovery 100 <br /> Matrix <br /> Spike Duplicate ug/L 240 <br />' % Recovery 97 <br /> Relative % Difference 3 0 <br />' RPD Control Limits 0-25 <br /> LCS Batch# GC112498BTEX02A <br /> Date Prepared 11/24/98 <br /> Date Analyzed 11/24/98 <br />' Instrument I D # GCHP02 <br /> Conc Spiked ug/L 250 <br />' LCS Recovery ug/L 240 <br /> LCS % Recovery 96 <br /> Percent Recovery Control Limits <br />' MS/MSD 50140 <br /> E: SCS 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 empioyed 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 If <br /> the recovery of analytes from the matrix spike does not fall within specified control limas due to matrix <br /> i� interference the LCS recover ;s to be used to validate the batch <br /> Kayvan`Ki yai <br /> Pray Maria er <br />