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L uola 680�i sapeake Drive Redwood City,CA 94089 (650)364-9600 FAX(650)364-9233 <br /> Seq 404 N.Wiget Lane Walnut Creek,CA 94598 (925)988 9600 FAX(925)988-9673 <br /> 00 <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 /> LATC 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: 9807772-05, -08-09 Reported: Jul 29, 1998 <br /> L <br /> QUALITY CONTROL DATA REPORT <br /> LMatrix: Liquid <br /> Method: EPA 8015 <br /> Analyst: G. Peshina <br /> ANALYTE Gasoline <br /> CQC Batch#: GC071598BTEX06A <br /> LSample No.: GW9807164-1 <br /> Date Prepared: 7/15/98 <br /> Date Analyzed: 7/15/98 <br /> Instrument I.D.#: GCHP6 <br /> Sample Conc., ug/L: N.D. <br /> Conc. Spiked, ug/L: 250 <br /> L Matrix Spike, ug/L: 250 <br /> % Recovery: 100 <br /> Matrix <br /> Spike Duplicate, ug/L: 260 <br /> % Recovery: 104 <br /> LRelative % Difference: 3.9 <br /> rRPD Control Limits: 0-25 <br /> �r <br /> LCS Batch#: GWBLK071598A <br /> LDate Prepared: 7/15/98 <br /> Date Analyzed: 7/15/98 <br /> Instrument I.D.#: GCHP6 <br /> LConc. Spiked, ug/L: 250 <br /> LCS Recovery, ug/L: 320 <br /> LCS % Recovery: 128 <br /> Percent Recovery Control Limits: <br /> MS/MSD 60-140 <br /> LCS 70.130 <br /> L F- <br /> Quality Assurance Statement: All standard operating procedures and quality control requirements have been met. <br /> L <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 /> [.tK <br /> a fortified with known quantities ofspecific 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 /> <imy 'roject Manager <br /> L <br />