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680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> Sequoia 404 N Wiget 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)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792 0342 <br /> ATC Associates, Inc Client Project ID Thiemann's Service 62505 0001 <br /> 1117 Lone Palm Ave Suite B <br /> Modesto, CA 95351 <br /> Attention Jeanne Homsey QC Sample Group 9901697-02 Reported Jan 24 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015 <br /> Analyst N H <br /> ANALYTE Gasoline <br /> QC Batch # GC012099BTEX03A <br /> Sample No 9901491-2 <br /> Date Prepared 1120199 <br /> Date Analyzed 1120/99 <br /> Instrument I D # GCHP03 <br /> Sample Conc uglL N D <br /> Conc Spiked, ug/L 250 <br /> Matrix Spike ug/L 240 <br /> % Recovery 96 <br /> Matrix <br /> Spike Duplicate, uglL 240 <br /> % Recovery 96 <br /> Relative % Difference 0 0 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GCO12099BTEX03A <br /> Date Prepared 1120199 <br /> Date Analyzed 1120199 <br /> Instrument I D # GCHP03 <br /> Conc Spiked uglL 250 <br /> LCS Recovery, ug1L 240 <br /> LCS % Recovery 96 <br /> Percent Recovery Control Limits <br /> F- <br /> MS/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 spikes an aliquot of sample <br />.� <br /> fortified with known quantities of specific compounds and subjected to the entire analyticai procedure If <br /> the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> interference the LCS recovery is to be used to validate the hatch <br /> Imy <br /> rolect M ager <br />