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' 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 4O4 N Wiget Lane Walnut Creek CA 94598 (92S)988-9600 FAX(925)988-9673 <br /> � Analytical 819 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)792-0342 <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 9809E49-03,05 Reported Oct 9, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ' Matrix Liquid <br /> Method EPA 8015A <br /> Analyst G WARDLE <br /> ANALYTE Diesel <br /> QC Batch # GC1002980HBPEXA <br /> LCS ID BLK100298AS <br /> Date Prepared 10/2/98 <br /> ' Date Analyzed 1012/98 <br /> Instrument I D # GCi-IP5A <br /> ' Conc Spiked, ug/L 1000 <br /> Blank Spike ug/L 730 <br /> 43/0 Recovery 73 <br /> Blank <br /> Spike Duplicate, ug/L 730 <br /> ' °/a Recovery 73 <br /> Relative % Difference 00 <br /> % Recovery <br /> Control Limits 50-150 <br /> ' RPD Control Limits 0-50 <br /> 1 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> ' Pie Nate <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 It <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 /> Kayv yai <br /> P ct Manag <br />