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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 (925)988-%00 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 Ripon USD 13099 0001 <br /> 1117 Lone Palm Avenue <br />' Modesto CA 95351-1502 <br /> Attention Jeanne Homsey CC Sample Group 99011293-01,02 Reported Feb 9 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8015A <br />' Analyst A PORTER <br /> ANALYTE Diesel <br /> QC Batch # GCO202990HBPEXB <br /> Sample No 9901 E27-05 <br /> Date Prepared 212199 <br /> Date Analyzed 212199 <br /> Instrument I D # GCHP4A <br /> Sample Cone u91L N D <br />' Conc Spiked, uglL 3000 <br /> Matrix Spike uglL 930 <br /> M % Recovery 93 <br /> Matrix <br /> Spike Duplicate, uglL 850 <br />' % Recovery 85 <br /> Relative % Dtfference 9 0 <br />' RPD Control Limits 0-50 <br />' LCS Batch# BLK020299BS <br /> Date Prepared 212199 <br /> Date Analyzed 212199 <br /> Instrument I D # GCHP4A <br /> Conc Spiked uglL 1000 <br />' Recovery, uglL 780 <br /> LCS % Recovery 78 <br /> Percent Recovery Control Limits <br />' MLCS 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 tree matrix that is analyzed using the same reagents <br /> 10EQUOIA 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 /> Ka my I <br /> rolect Man ger <br /> 1 <br />