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1 <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 1%p Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste 0 Petaluma,CA 94954 (707)792-1865 FAX(707)79Z-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 9809EO4-01-08 Reported Oct 1, 1998 <br />' QUALITY CONTROL DATA REPORT <br /> Matrix Solid <br /> Method EPA 8015 <br /> Analyst R GECKLER <br /> ANALYTE Gasoline <br />' QC Batch # GC092398BTEXEXC <br /> Sample No 9809D68-10 <br /> Date Prepared 9123198 <br /> Date Analyzed 9124198 <br /> Instrument I D # GCHP18 <br />' Sample Conc , mg/Kg N D <br /> Conc Spiked, mg/Kg 5 0 <br /> Matrix Spike, mg/Kg 6 3 <br /> % Recovery 126 <br /> Matrix <br /> Spike Duplicate, mg/Kg 6 4 <br />' % Recovery 128 <br /> Relative % Difference 1 6 <br />' RPD Control Limits 0-25 <br />' LCS Batch# GCO923988TEXEXC <br /> Date Prepared 9/23198 <br /> Date Analyzed 9124198 <br />' Instrument I D # GCHP18 <br /> Conc Spiked, mg/Kg 5 0 <br />' Recovery, mg/Kg 5 5 <br /> LCS % Recovery 110 <br />' Percent Recovery Control Limits <br /> MS/MSD 60140 <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 /> i 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 fail within specified control limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> Ka lmyai <br /> Project Manager <br /> 1 <br />