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Sequoia 404 N. , CAet Lane <br /> 1, Walnut Creek, CA 94598 � <br /> (925)988-9600 <br /> Analytical FAX(925) 988-9673 <br /> -sequoia AnalyticalCliehi Project ID: M906850-ATC Associates'f nc. <br /> 885 Jarvis Dr. Matrix: Liquid <br /> Morgan Hill, CA. 95037 <br /> Attention: 'Kayvan Kimyai QC Sample Group: 9062447-452 Reported: Jul 9, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#: GC070799 GC070799 GCO70799 GC070799 <br /> 802002A 802002A 802002A 802002A <br /> Analy. Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep. Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst: J. Minkel J.Minkel J. Minkel J. Minkel <br /> MS/MSD#: 9062447 9062447 9062447 9062447 <br /> Sample Conc.: N.D. N.D. N.D. N.D. <br /> Prepared Date: 7/7/99 7/7/99 7/7/99 7/7/99 <br /> Analyzed Date: 7/7/99 7/7/99 7/7/99 7/7/99 <br /> instrument I.D.#: HP-2 HP-2 HP-2 HP-2 <br /> Conc. Spiked: 20pg/L 20Ng/L 20pg/L 60Ng/L <br /> Result: 20 19 19 64 <br /> MS % Recovery: 100 95 95 107 <br /> Dup. Result: 19 17 17 55 <br /> MSD % Recov.: 95 85 85 92 <br /> RPD: 5.1 11 11 15 <br /> RPD Limit: 0-20 0-20 0-20 0-20 <br /> LCS #: 2LCS070799 2LCS070799 2LCS070799 2LCS070799 <br /> Prepared Date: 7/7/99 7/7/99 7/7/99 7/7/99 <br /> Analyzed Date: 7/7/99 7/7/99 7/7/99 7/7/99 <br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 <br /> Conc. Spiked: 20 pg/L 20 pg/L 20 ug/L 60 ug/L <br /> LCS Result: 20 19 19 64 <br /> LCS % Recov.: 100 95 95 107 <br /> LCS 70-130 70-130 70-130 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 AN TICAL, #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 /> 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 /> Charlie Westwater MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference <br /> Project Manager <br /> { 9062447.SSS <2> <br /> `6CY <br />