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i Ey <br /> 680.nesapeake Drive Redw od City,CA 940 (650) 364-9600 FAX(650)364-9233 <br /> Sequoia 404 N-Wiget Lane Wain t Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 9-5) Analytical 819 Striker Avenue,Suite 8 Sacramento.CA 95834' (916)921-9600 FAX(916)921-0100 <br /> F1455 McDowell Blvd.North.Ste.D €'etal ma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> ill� 1551 Industrial Road San Carlos, CA 9470-4111 (650)232-9600 FAX(650)232-9612 <br /> FATC Associates Client Project ID: S SD-Edison High School <br /> 1117 Lone Palm Avenue <br /> Modesto, CA 95351-1102 <br /> Attention: Tom Lutterman QC Sample Group: 9902A36-01-07 Reported: Mar 1, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> F. Matrix: Liquid <br /> Method: EPA 8020 <br /> Analyst: TLP <br /> VF <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch #: GCO22499BTEX038 <br /> Sample No.: GSTD022499B <br /> Date Prepared: 2124/99 2/24/99 2124/99 2/24/99 <br /> Date Analyzed: 2/24/99 2124/99 2/24/99 2/24/99 <br /> Instrument I.D.#: GCHP03 GCHP03 GCHP03 GCHP03 <br /> Sample Conc., ug/L: N.D. N.D. N.D. N.D. <br /> F, Conc. Spiked, ug/L: 10 10 10 30 <br /> Matrix Spike, ug/L: 9.2 9.4 9.4 28 <br /> Recovery: 92 94 94 93 <br /> Matrix <br /> Spike Duplicate, ug/L: 9.2 9.3 9.4 28 <br /> rTo Recovery: 92 .93 94 93 <br /> Relative % Difference: 0.0 1.1 0.0 0.0 <br /> 6 RPD Control Limits: 0-25 0-25 0-25 0-25 <br /> FLCS Batch#: <br /> Date Prepared: <br /> Date Analyzed: <br /> Instrument 1.D.#: <br /> Conc. Spiked, ug/L: 10 10 10 30 <br /> LCS Recovery, ug/L: 0.0 0.0 0.0 0.0 <br /> LCS % Recovery: 0.0 0,0 0.0 0.0 <br /> Percent Recovery Control Limits: <br /> MS/MSD 60-140 60-140 60-140 60-140 E <br /> LCS 70-130 70-130 70-130 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 employ,-d 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 /> i <br /> interference,the LCS recovery is to be used to validate the batch. <br /> Kay <br /> Project Manager <br />