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680(t.R apeake Drive Redwood City,CA 9406 (650) 364-9600 FAX(650)364-9233 <br /> Sequoia 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 /> 164W Analytical 1455 McDowell Blvd.North,Ste.D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> . .L "X- ...:..................................... <br /> ATC Associates, Inc. Client Project ID: Van Dyken Prop/N&S Irrigation <br /> «:1260 Graphics Drive Matrix: Solid <br /> Modesto, CA 95351-1502 <br /> ::;.Attention: Jeanne Homsey Work Order#: 980772-01 Reported: Jul 31, 1998 <br /> ....................................................... <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: MTBE <br /> �• OC Batch#: MS071698MTBEEXA <br /> Analy. Method: EPA 8260 <br /> Prep. Method: N.A. <br /> Analyst: S.Goldstein <br /> MS/MSD#: 980786501 <br /> Sample Cone.: N.D. <br /> Prepared Date: 7/16/98 <br /> Analyzed Date: 7/16/98 <br /> Instrument I.D.#: H6 <br /> Cone. Spiked: 2500 fug/Kg <br /> Result: 2400 <br /> LMS %Recovery: 96 <br /> Dup. Result: 2200 <br /> MSD % Recov.: 88 <br /> RPD: 8.7 <br /> RPD Limit: 0-25 <br /> ...................................................:............................................................................................. <br /> .............................................................. :.... :::.:........... -....................... <br /> LCS#: LCS071698 <br /> Prepared Date: 7/16/98 <br /> Analyzed Date: 7/16/98 <br /> Instrument I.D.#: H6 <br /> Cone. Spiked: 2500Ng/Kg <br /> LCS Result: 2600 <br /> LCS % Recov.: 104 <br /> 60-140 <br /> LCS 70-130 <br /> Control Limits <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 /> an Ki <br /> roject nagger **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9807772,AAA <2> <br />