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Sequoia 404 N. , CA Lane <br /> 4D Walnut Creek, CA 94598 <br /> (925)988-9600 <br /> Analytical <br /> FAX(925)988-9673 <br /> Roy F. Weston, Inc. Client Project ID: Home Depot, Tracy <br /> 2300 Clayton Rd., Ste 1580 Matrix: Solid <br /> Concord, CA 94520 <br /> Attention: Scott Lookingbill QC Sample Group: 9050780-785 Reported: Jun 4, 1999'< <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: 2,4-D 2,4,5-TP <br /> (Silvex) <br /> QC Batch#: 0590610 0590610 <br /> Analy. Method: EPA 8151 EPA 8151 <br /> Prep. Method: EPA 8151 EPA 8151 <br /> Analyst: North Creek North Creek <br /> MS/MSD #: - <br /> Sample Conc.: <br /> Prepared Date: <br /> Analyzed Date: <br /> Instrument I.D.#: <br /> Conc. Spiked: <br /> Result: <br /> MS % Recovery: <br /> Dup. Result: <br /> MSD % Recov.: <br /> RPD: <br /> RPD Limit: <br /> LCS #: LCS052499 LCS052499 <br /> Prepared Date: 5/24/99 5/24/99 <br /> Analyzed Date: 5/28/99 5/28/99 <br /> Instrument I.D.#: - - <br /> Conc. Spiked: 76 Ng/kg 76µg/kg <br /> LCS Result: 82 65 <br /> LCS % Recov.: 137 108 <br /> LCS 41-141 51-116 <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, #1267 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 /> J lianne FegIey **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference <br /> roject Manager <br /> 9050783.RFW <9> <br />