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y <br /> Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 1 404 N.Wiget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 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 /> ATC Associates, Inc. Client Project ID: Glover Property 17861.0001 <br /> 1260 Graphics Drive <br /> Modesto, CA 95351-1502 <br /> Attention: Jeanne Homsey QC Sample Group: 9810717-03 Reported: Oct 23, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix: Liquid <br /> Method: EPA 8020 <br /> Analyst: MM <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch#: GC1 01 398BTEX03A <br /> Sample No.: GW9810024-1 <br /> Date Prepared: 10/13/98 10113198 10/13/98 10/13/98 <br /> Date Analyzed: 10/13/98 10/13/98 10/13/98 10/13/98 <br /> Instrument I.D.#: GCHP03 GCHP03 GCHP03 GCHP03 <br /> Sample Conc., uglL: N.D. N.D. N.D. N.D. <br /> Conc. Spiked, ug/L: 10 10 10 30 <br /> Matrix Spike, ug/L: 11 11 11 34 <br /> % Recovery: 110 110 110 113 <br /> G~ Matrix <br /> Spike Duplicate, ug/L: 11 11 11 34 <br /> % Recovery: 110 110 110 113 <br /> Relative % Difference: 0.0 0.0 0.0 0.0 <br /> RPD Control Limits: 0-25 0-25 0-25 0-25 <br /> LCS Batch#: GWLCS101398A <br /> Date Prepared: 10/13/98 10/13/98 10/13/98 10/13/98 <br /> Date Analyzed: 10/13/98 10/13/98 10/13/98 10/13/98 <br /> Instrument I.D.#: GCHP03 GCHP03 GCHP03 GCHP03 <br /> Conc. Spiked, ug/L: 10 10 10 30 <br /> LCS Recovery, ug/L: 9.4 9.1 9.0 27 <br /> LCS % Recovery: 94 91 90 90 <br /> Percent Recovery Control Limits: <br /> MSIMSD 60-140 60-140 60-140 60-140 <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 employed for the samples. The matrix spike is an aliquot of sample <br /> f A 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 hatch. <br /> Ka Kimya i <br /> oject Man er <br />