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C0sapeake Drive Redwood City,CA 9406 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 46804 N.Wiget lane Walnut Creek,CA 94598 (9Z5)988-9600 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 /> t <br /> r nATC Associates, Inc. Client Project ID: Van Dyken <br /> P'r; p/>N S Irrigation <br /> .......................................................................... <br /> .1260 Graphics Drive Matrix: Solid <br /> .;Modesto, CA 95351-1502 <br /> :.:..:Attention: Jeanne Hornsey Work Order#: 9807772-02-04 Reported: Jul 31, 1998..... <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: MTBE <br /> QC Batch#: MS071598MTBEEXA <br /> Analy. Method: EPA 8260 <br /> Prep. Method: N.A. <br /> Analyst: M.Williams <br /> MS/MSD#: 980777204 <br /> Sample Conc.: N.D. <br /> Prepared Date: 7/15/98 <br /> Analyzed Date: 7/15/98 <br /> Instrument I.D.#: H6 <br /> Conc. Spiked: 2500µg/Kg <br /> C <br /> Result: 2400 <br /> rMS%Recovery: 96 <br /> �✓ Dup. Result: 2200 <br /> MSD %Recov.: 88 <br /> RPD: 8.7 <br /> RPD Limit: 0-25 <br /> ............................i................................................. ................................................................................. <br /> L ..................... <br /> LCS#: LCS071598 . <br /> Prepared Date: 7/15/98 <br /> Analyzed Date: 7/15/98 <br /> Instrument I.D.#: H6 <br /> Conc. 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 /> Ka imyai <br /> rPr ject Manager MS Matrix Spike, MSD MS Duplicate,RPD Relative%Difference 9807772.AAA <4> <br /> L <br />