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Sequoia 404 N. ,CA Lane <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: 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: Benzene Toluene Ethyl Xylenes Diesel Oil&Grease <br /> I Benzene <br /> QC Batch#: GCO51399 GCO51399 GCO51399 GC051399 SP051899 SP051499 <br /> 802004A 802004A 802004A 802004A 8015EXA 4181EXA <br /> Analy. Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M EPA 418.1 <br /> Prep. Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 3510 EPA 3510 <br /> Analyst: J. Minkel J. Minkel J.Minkel J.Minkel K.Grubb I.Dueana <br /> MS/MSD #: 9050488 9050488 9050488 9050488 BLK051899 BLK051499 <br /> Sample Conc.: N.D. N.D. N.D. N.D. N.D. N.D. <br /> Prepared Date: 5/13/99 5/13/99 5/13/99 5/13/99 5/18/99 5/14/99 <br /> Analyzed Date: 5/13/99 5/13/99 5/13/99 5/13/99 5/18/99 5/14/99 <br /> nstrument I.D.#: HP-4 HP-4 HP-4 HP-4 HP-3A Miran-1A <br /> Conc. Spiked: 20µg/L 20 Ng/L 20µg/L 60 Ng/L 500 Ng/L 8.0 mg/L <br /> Result: 21 17 18 59 550 7.4 <br /> MS % Recovery: 105 85 90 98 110 93 <br /> Dup. Result: 20 17 18 61 520 7.5 <br /> MSD % Recov.: 100 85 90 102 104 94 <br /> RPD: 4.9 0.0 0.0 3.3 5.6 1.3 <br /> RPD Limit: 0-20 0-20 0-20 0-20 0-50 0-50 <br /> LCS #: 4LCS051399 4LCS051399 4LCS051399 4LCS051399 LCS051899 LCS051499 <br /> Prepared Date: 5/13/99 5/13/99 5/13/99 5/13/99 5/18/99 5/14/99 <br /> Analyzed Date: 5/13/99 5/13/99 5/13/99 5/13/99 5/18/99 5/14/99 <br /> .nstrument I.D.#: HP-4 HP-4 HP-4 HP-4 HP-3A Miran-1A <br /> Conc. Spiked: 20 Ng/L 20 Ng/L 20 pg/L 60 Ng/L 500 Ng/L 8.0 mg/L <br /> LCS Result: 21 18 18 63 500 7.5 <br /> LCS % Recov.: 105 90 90 105 100 94 <br /> ILCS 70-130 70-130 70-130 70-130 60-140 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, #1271 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 /> tr'1'ALL, 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 /> Janne Fegley **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference <br /> Project Manager <br /> 9050775.RFW <16> <br />