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I <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 /> Analytical 819 Striker Avenue.Suite 8 Sacramento,C4 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 t <br /> t <br /> E <br /> sociates, Inc. Client Project ID: SUSD-Corp. Yard <br /> ne Palm Avenue <br /> , CA 95351-1502 <br /> n: Tom Lutterman QC Sample Group: 9902A37-01-04 Reported: Feb 26, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix: Solid <br /> Method: EPA 8015M <br /> Analyst: A. PORTER <br /> ANALYTE Diesel <br /> QC Batch#: GCO223990HBPEXB <br /> Sample No.: 9902A36-06 <br /> Date Prepared,- 2123199 <br /> Date Analyzed: 2125/99 <br /> Instrument I.D.#: GCHP4B <br /> Sample Conc., mg/Kg: N.D. <br /> Conc. Spiked, mg/Kg: 17 <br /> Matrix Spike, mg/Kg: 13 <br /> y� % Recovery: 76 <br /> Matrix <br /> Spike Duplicate, mg/Kg: 14 <br /> % Recovery: 82 <br /> Relative % Difference: 7.6 <br /> RPD Control Limits: 0-50 <br /> LCS Batch#: BLK022399BS <br /> Date Prepared: 2123199 <br /> Date Analyzed: 2125199 <br /> Instrument I.D.#: GCHP46 <br /> Conc. Spiked, mglKg: 17 <br /> Recovery, mg/Kg: 13 <br /> LCS % Recovery: 76 <br /> Percent Recovery Control Limits: <br /> MSIIVISD 50-150 <br /> LCS 60-140 <br /> Quality Assurance Statement: All standard operating procedures and quality control requirements have been met. <br /> r� 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 /> fortified with known quantities of specific compounds and subjected to the entire analytical q p p 1 y 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 Imy <br /> Project Manager <br /> I <br />