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s r, <br /> Sequoia 600 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-4600 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 Asscclates, l�tc Client Project ID Stockton Fire Stdtion #2 <br /> 1260 Graphics Diive <br /> Modesto, CA 3551-1502 <br /> Pttention Jeanne Homsey QC Sample Group 9806259-01-04 Reported Jun 17 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015A <br /> Analyct A Porte- <br /> ANALYTE Diesel <br /> QC Batch # GC0614980HBPEXY <br /> LCS ID BLK06149BYSIYSD <br /> Date Prepared 6114(98 <br /> Date Analyzed 6/15/98 <br /> Instrument I D # GCHP4A <br /> Conc Spiked ug/L 1000 <br /> Blank Spike, ug1L 630 <br /> % Recovery 63 <br /> Blank - <br /> Spike Duplicate, ug/L 630 <br /> % Recovery 63 <br /> Relative % Difference 00 <br /> % Recovery <br /> Control Li nits 50-150 <br /> RPD Control Limits 0-50 <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 The <br /> 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 tall within specified control limits due to matrix <br /> interference the LCS recover is to be used to validate the batch <br /> K an Kim ai <br /> Project Manager <br />