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C680 sapeake Drive Redwood City.CA 940 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N.Wiget Lane Walnut Creek,CA 94598 (925)988-%00 FAX(925)988-9673 <br /> ' 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-010 0 <br /> Analytical 1455 McDowell Blvd.North,Ste.D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> � y <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: 9807772-10 Reported: Jul 29, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix: Solid <br /> Method: EPA 8015 <br /> Analyst: G. PESHINA <br /> ANALYTE Gasoline <br /> rQC Batch #: GC072398BTEXEXB <br /> 1rr Sample No.: GS9807657-15 <br /> Date Prepared: 7/23/98 <br /> Date Analyzed: 7/23/98 <br /> Instrument I.D.#: GCHP18 <br /> Sample Conc., mg/Kg: N.D. <br /> CConc. Spiked, mg/Kg: 5.0 Matrix Spike, mg/Kg: 5.3 <br /> i, <br /> % Recovery: 106 <br /> Matrix <br /> I <br /> Spike Duplicate, mg/Kg: 5.6 <br /> % Recovery: 112 <br /> Relative /o Difference: 5.5 <br /> RPD Control Limits: 0-25 <br /> LCS Batch#: GSBLK072398B <br /> Date Prepared: 7/23/98 <br /> Date Analyzed: 7/23/98 <br /> Instrument I.D.#: GCHP18 <br /> CConc. Spiked, mg/Kg: 5.0 <br /> Recovery, mg/Kg: 5.6 <br /> LLCS % Recovery: 112 <br /> Percent Recovery Control Limits: <br /> MS/MSD 60-140 <br /> LCS 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 /> interference,the LCS recovery is to be used to validate the batch. <br /> Kn Kimya <br /> Project Manager <br />