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R <br /> '"►.� 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650) 364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Straker Avenue Suite 8 Petaluma, <br /> o CA 95834 (906)921-9600 FAX(916)79 0300 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 {707}792-1865 FAX(707)792-0342 <br /> ATC Associates, Inc Client Project ID Stock Fire Stat #2 62574 0001 <br /> 1117 Lone Palm Avenue <br /> Modesto, CA 95351-1502 <br /> Attention Jeanne Homsey QC Sample Group 9812F36-03-05 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 # GC 123198STEX30A <br /> Sample No GW9812F36-5 <br /> Date Prepared 12/31/99 <br /> Date Analyzed 12/31/99 <br /> Instrument I D # GCHP30 <br /> Sample Conc uglL N D <br /> Conc Spiked, uglL 250 <br /> Matrix Spike, uglL 250 <br /> % Recovery 101 <br /> Matrix <br /> Spike Duplicate uglL 260 <br /> % Recovery 103 <br /> Relative % Difference 2 0 <br /> RPD Control Limits 0-25 <br /> LCS Batch# GC123198BTEX30A <br /> Date Prepared 12/31/99 <br /> Date Analyzed 12/31/99 <br /> Instrument I D # GCHP30 <br /> Conc Spiked, uglL 250 <br /> LCS Recovery ug1L 270 <br /> LCS % Recovery 109 <br /> Percent Recovery Control Limits <br /> MS/MSD 60 140 <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 /> 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 /> ���� nterferenc� the LCS recovery is to be used to validate the batch <br /> Kayvan Klmyay <br /> Project Manager <br />