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Sequoia 404 N. ,CA Lane <br /> Walnut Creek,CA 94598 <br /> 00 <br /> Analytical <br /> ,!D (925)988-96 <br /> FAX(925)988-967373 <br /> Roy F. Weston, Inc. Client Project ID: Home Depot, Tracy <br /> 2300 Clayton Rd., Ste 1580 Matrix: Liquid <br /> Concord, CA 94520 <br /> Attention: Scott Lookingbill QC Sample Group: 9050775-777 Reported: Jun 2, 1999-.:: <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Aldrin 4,4'-DDT Dieldrin Heptachlor <br /> QC Batch#: 05V9339 05V9339 05V9339 05V9339 <br /> Analy. Method: EPA 8081 EPA 8081 EPA 8081 EPA 8081 <br /> Prep. Method: EPA 3510 EPA 3510 EPA 3510 EPA 3510 <br /> Analyst: Star Analytical Star Analytical Star Analytical Star Analytical <br /> MS/MSD#: BLK051799 BLK051799 BLK051799 BLK051799 <br /> Sample Conc.: N.D. N.D. N.D. N.D. <br /> Prepared Date: 5/17/99 5/17/99 5/17/99 5/17/99 <br /> Analyzed Date: 5/19/99 5/19/99 5/19/99 5/19/99 <br /> Instrument I.D.#: - - - - <br /> Conc. Spiked: 0.20 Ng/L 0.50 pg/L 0.50 Ng/L 0.20 Ng/L <br /> Result: 0.18 0.41 0.52 0.15 <br /> MS % Recovery: 90 82 104 73 <br /> Dup. Result: 0.17 0.41 0.47 0.16 <br /> MSD %Recov.: 83 82 94 78 <br /> RPD: 13 12 14 21 <br /> RPD Limit: 0-30 0-30 0-30 0-30 <br /> LCS#: LCS051799 LCS051799 LCS051799 LCS051799 <br /> Prepared Date: 5/17/99 5/17/99 5/17/99 5/17/99 <br /> Analyzed Date: 5/19/99 5/19/99 5/19/99 5/19/99 <br /> Instrument I.D.#: - - - - <br /> Conc. Spiked: 0.20 Ng/L 0.50µg/L 0.50 Ng/L 0.20pg/L <br /> LCS Result: 0.19 0.37 0.41 0.13 <br /> LCS % Recov.: 95 73 82 63 <br /> MSIMSD <br /> LCS 60-130 60-130 60-130 60-130 <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, #1894 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 /> /f interference,the LCS recovery is to be used to validate the batch. <br /> lianne Fegley **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference <br /> Project Manager <br /> 9050775.RFW <18> <br />