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4 <br /> Sequoia <br /> 680�sapeake Drive Redwood City,CA 940 (650)364-9600 FAX(650)364-9233 <br /> 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 /> Analytical 1455 McDowell Blvd.North,Ste.D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> ATC Associates, Inc. Client Project ID: Van Dyken Prop/N&S Irrigation <br /> 1260 Graphics Drive <br /> Modesto, CA 95351-1502 <br /> Attention: Jeanne Homsey QC Sample Group: 9807772-06 Reported: Jul 29, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix: Liquid <br /> Method: EPA 8020 <br /> Analyst: G. Peshina <br /> LANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> rQC Batch#: GC0716986TEX06A <br /> r.r Sample 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 /> Instrument I.D.#: GCHP6 GCHP6 GCHP6 GCHP6 <br /> 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 11 32 <br /> % Recovery: 110 100 110 107 <br /> Matrix <br /> Spike Duplicate, ug/L: 11 11 11 34 <br /> % Recovery: 110 110 110 113 <br /> Relative % Difference: 0.0 9.5 0.0 5.5 <br /> rRPD Control Limits: 0-25 0-25 0-25 0-25 <br /> Lr <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.#: GCHP6 GCHP6 GCHP6 GCHP6 <br /> Conc. Spiked, ug/L• 10 10 10 30 <br /> rr LCS Recovery, ug/L: 11 11 11 34 <br /> LCS % Recovery: 110 110 110 113 <br /> Percent Recovery Control Limits: <br /> MS/MSD 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 /> LPlease 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 /> interference,the LCS recover is to be used to validate the batch. <br /> n K'r�ya <br /> Project Ma <br /> C <br />