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V� Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> !Y' 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> � Analytical S19 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)791-0342 <br /> ATC Associates, Inc Client Project ID Thlemann's Service 62605 0001 <br /> 1260 Graphics Drive <br /> Modesto, CA 95351-1502 <br /> Attention Jeanne Homsey QC Sample Group 9810718-01-02 Reported Oct 13, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst NC <br /> ANALYTE Gasoline <br /> QC Batch# GC101298STEX03A <br /> Sample No GW9810020-02 <br /> Date Prepared 10/12/98 <br /> Date Analyzed 10/12/98 <br /> Instrument 1 D# GCHP03 <br /> Sample Conc , uglL N D <br /> Conc Spiked, ug/L 250 <br /> Matrix Spike, ug/L 220 <br /> % Recovery 88 <br /> Matrix <br /> Spike Duplicate, uglL 220 <br /> % Recovery 88 <br /> Relative % Difference 0 0 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GC101298BTEX03A <br /> Date Prepared 10/12/98 <br /> Date Analyzed 10/12/98 <br /> Instrument I D# GCHP03 <br /> Conc Spiked, uglL 250 <br /> LCS Recovery, uglL 250 <br /> LCS % Recovery 100 <br /> Percent Recovery Control Limits <br /> MIS/MSD 60140 <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 /> SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> c "i 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 limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> K <br /> in, <br /> rolect Manager <br />