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' 680 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N.Wlget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> *0 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 /> 1551 Industrial Road San Carlos, CA 94070-4111 (650)232-9600 FAX(650)232-9612 <br />' ATC Associates, Inc. Client Project ID: SUSD/Sta High School <br /> 1 99 9 <br /> 1117 Lone Palm Avenue <br /> Modesto, CA 95351-1502 <br /> Attention: Tom Lutterman QC Sample Group: 9903068-01-03 Reported: Mar 24, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix: Solid <br />' Method: EPA 8015 <br /> Analyst: R.GECKLER <br /> ANALYTE Gasoline <br /> QC Batch #: GC030599BTEXEXA <br /> Sample No.: 9902D88-1 <br />' Date Prepared: 3/5/99 <br /> Date Analyzed: 3/5/99 <br /> Instrument I.D.#: GCHP22 <br /> Sample Cone., mg/Kg: N.D. <br /> Cone. Spiked, mg/Kg: 5.0 <br /> Matrix Spike, mg/Kg: 5.0 <br /> % Recovery: 100 <br /> Matrix <br /> Spike Duplicate, mg/Kg: 4.5 <br /> % Recovery: 90 <br /> Relative % Difference: 11 <br />' RPD Control Limits: 0-25 <br /> ILCS Batch#: GC030599BTEXEXA <br /> Date Prepared: 3/5/99 <br /> Date Analyzed: 3/5/99 <br /> Instrument I.D.#: GCHP22 <br /> Cone. Spiked, mg/Kg: 5.0 <br />' Recovery, mg/Kg: 5.4 <br /> LCS % Recovery: 108 <br /> Percent Recovery Control Limits: <br /> MSIMSD 60-140 <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 /> QUQIA 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 /> Kayv myai <br /> Project Manager <br />