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1 <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650) 364-9233 <br /> 404 N Wlget Lane Walnut Creek CA 94598 (925)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) 792-034Z <br /> ATC Associates, Inc Client Project ID Ripon Unified School <br /> 1260 Graphics Drive <br />' Modesto, CA 95351-1502 <br /> Attention Drew Van Allen QC Sample Group 9809E04-03-08 Reported Oct 1, 1998 <br />' QUALITY CONTROL DATA REPORT <br /> Matrix Solid <br /> Method EPA 8015M <br /> Analyst A PORTER <br /> ANALYTE Diesel <br />' QC Batch # GC0924980HBPEXA <br /> Sample No 9809003-26 <br />' Date Prepared 9124198 <br /> Date Analyzed 9125198 <br /> Instrument I D # GCHP5B <br />' Sample Cone , mg/Kg N D <br /> Cone Spiked, mg/Kg 17 <br /> Matrix Spike, mg/Kg 17 <br /> % Recovery 100 <br /> Matrix <br /> Spike Duplicate, mg/Kg 13 <br />' % Recovery 76 <br /> Relative % Difference 27 <br />' RPD Control Limits 0-50 <br />' LCS Batch# BLK092498AS <br /> Date Prepared 9124198 <br />' Date Analyzed 9125198 <br /> Instrument I D # GCHP513 <br /> Cone Spiked, mglKg 17 <br />' Recovery, mg/Kg 14 <br /> LCS % Recovery 82 <br />' Percent Recovery Control Limits <br /> MS/MSD 50150 <br /> LCs 60 140 <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 some 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 /> interference the LCS recovery is to be used to validate the batch <br /> an Kim <br />' Project Manager <br />