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A <br /> Sequoia <br /> Drive Redwood City,CA 940 (650)364-9600 FAX(650)364-9233 <br /> z 404 N.Wiget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> ' 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-0100 <br /> vQp Analytical 1455 McDowell Blvd.North,Ste.D Petaluma,CA 94954 (707)792-1865 FAX(707).79 2-0342 <br /> ATC Associates, Inc. Client Project ID:.Van Dyken Prop/N&S Irrigation <br /> 1260 Graphics Drive <br /> Modesto, CA 95351-1502 <br /> CAttention: Jeanne Homsey QC Sample Group: 9807772-07 Reported: Jul 29, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix: Liquid <br /> Method: EPA 8020 <br /> Analyst: G. Peshina <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch #: GC071698BTEX07A <br /> LSample No.: GW9807736-2 <br /> Date Prepared: 7/16/98 7/16/98 7/16/98 7/16/98 <br /> Date Analyzed: 7/16/98 7/16/98 7/16/98 7/16/98 <br /> C Instrument I.D.#: GCHP7 GCHP7 GCHP7 GCHP7 <br /> L Sample Conc., ug/L: N.D. N.D. N.D. N.D. <br /> Conc. Spiked, ug/L: 10 10 10 30 <br /> Matrix Spike, ug/L: 11 10 10 31 <br /> % Recovery: 110 100 100 103 <br /> Matrix <br /> Spike Duplicate, ug/L: 11 10 10 31 <br /> % Recovery: 110 100 100 103 <br /> >r.l 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#: GWBLK071698A <br /> Date Prepared: 7/16/98 7/16/98 7/16/98 7/16/98 <br /> Date Analyzed: 7/16/98 7/16/98 7/16/98 7/16/98 <br /> Instrument I.D.#: GCHP7 GCHP7 GCHP7 GCHP7 <br /> Conc. Spiked, ug/L: 10 10 10 30 <br /> LCS Recovery, ug/L: 11 11 10 32 <br /> LCS % Recovery: 110 110 100 107 <br /> Percent Recovery Control Limits: <br /> MS/MSD 60-140 60-140 60.140 60-140 <br /> LCS 70-130 7.0-130 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 /> 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 /> n Kimy interference,the LCS recover is to be used to validate the batch. <br /> a <br /> Project Manager <br /> irr II <br />