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Sequoia 404 N. ,CA Lane <br /> C) <br /> 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 OC Sample Group: 9050780-785 Reported: Jun 4, 1999iii <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Oil&Grease 2,4-D 2,4,5-TP Aldrin gamma-BHC Heptachlor Aroclor 1260 <br /> (Lindane) <br /> IQC Batch#: SP051999 0590610 0590610 0590610 0590610 0590610 0590610 <br /> 4181EXA <br /> Analy. Method: EPA 418.1 EPA 8081 EPA 8081 EPA 8081 EPA 8081 EPA 8081 EPA 8081 <br /> Prep. Method: EPA 3550 EPA 8082 EPA 8082 EPA 8082 EPA 8082 EPA 8082 EPA 8082 <br /> Analyst: N.VanSlambrook North Creek North Creek North Creek North Creek North Creek North Creek <br /> MS/MSD #: 9050497 B905321-01 B905321-01 B905291-01 6905291-01 B905291-01 8905291-01 <br /> Sample Conc.: N.D. 5820Ng/kg N.D. N.D. N.D. N.D. N.D. <br /> Prepared Date: 5/19/99 5/24/99 5/24/99 5/24/99 5/24/99 5/24/99 5/24/99 <br /> Analyzed Date: 5/20/99 5/28/99 5/28/99 5/20/99 5/20/99 5/20/99 5/21/99 <br /> Instrument I.D.#: Miran-1A - - - - - _ <br /> Conc. Spiked: 200 mg/kg 76 Ng/kg 76 Ng/kg 9.1 Ng/kg 9.1 Ng/kg 9.1 Ng/kg 363Ng/kg <br /> Result: 190 4800 6.1 7.3 7.4 337 <br /> MS % Recovery: 95 - 67 80 82 93 <br /> Dup. Result: 180 6040 6.3 7.6 7.8 317 <br /> MSD % Recov.: 90 - 70 83 86 87 <br /> RPD: 5.4 - - 3.2 4.1 4.8 6.1 <br /> RPD Limit: 0-30 0-44 0-27 0-33 0-35 0-32 0-23 <br /> LCS #: LCS051999 BLK052499 BLK052499 <br /> Prepared Date: 5/19/99 5/24/99 5/24/99 <br /> Analyzed Date: 5/20/99 5/26/99 5/26/99 <br /> Instrument I.D.#: Miran-1A - - <br /> Conc. Spiked: 200 mg/kg 60 pg/kg 60 Ng/kg <br /> LCS Result: 190 82 65 <br /> LCS %Recov.: 95 137 108 - <br /> LCS 70-130 41-141 51-116 35-138 44-137 40-146 44-123 <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, #1271 preparation,and analytical methods employed for the samples. The matrix spike is an aliquot of sample <br /> #1267 fortified with known quantities of specific compounds and subjected to the entire analytical procedure. If <br /> �n/ the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> r"L interference,the LCS recover is to be used to validate the batch. <br /> Yulilat-XV <br /> ne Fegley **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference <br /> Project Manager <br /> 9050783.RFW <8> <br />