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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N.Wiget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-010 0 <br /> 1455 McDowell Blvd.North,Ste.D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> ,.J�tiler-Ryan-Dublin 016'ht Project f0'.'"""Tosco ''111195, Lathrop <br /> 47 Sierra Court, Suite J Matrix: Solid <br /> Dublin, CA 94568 - <br /> Attention: Clyde Galantine QC Sample Group: 9010001-007 Reported: Jan 14, 1999;:: <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes MTBE <br /> Benzene <br /> QC Batch#: SP010899 SP010899 SP010899 SP010899 SP123198 <br /> 8020EXA 8020EXA 8020EXA 8020EXA 8260EXA <br /> Analy. Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8260 <br /> Prep. Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst: C.Westwater C.Westwater C.Westwater C.Westwater N.Nelson <br /> MS/MSD #: 9010324 9010324 9010324 9010324 8122277 <br /> Sample Conc.: N.D. N.D. N.D. N.D. N.D. <br /> Prepared Date: 1/8/99 18/99 1/8/99 1/8/99 12/31/98 <br /> Analyzed Date: 1/8/99 1/8/99 1/8/99 1/8/99 1/1/99 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP-4 GC/MS-2 <br /> Conc. Spiked: O.BO mg/Kg 0.80 mg/Kg 0.80 mg/Kg 2.4 mg/Kg 2500 ug/kg <br /> Result: 0.93 0.80 0,81 2.7 2,500 <br /> MS % Recovery: 116 100 101 113 100 <br /> Dup. Result: 1,0 0.87 0.88 2.9 2,900 <br /> --:: ;,MSD % Recov.: 125 109 110 121 116 <br /> RPD: 7,3 8.4 8.3 7.1 15 <br /> RPD Limit: 0-20 0-20 0-20 0.20 0-25 <br /> LCS #: 4LCS010899 4LCS010899 4LCS010899 4LCS010899 <br /> Prepared Date: 1/8/99 1/8/99 1/8/99 1/8/99 <br /> Analyzed Date: 1/8/99 1/8/99 1/8/99 1/8/99 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP-4 <br /> Conc. Spiked: 0.80 mg/Kg 0.80 mg/Kg 0.80 mg/Kg 2.4 mg/Kg <br /> LCS Result: 0.88 0,75 0.76 2.6 <br /> LCS % Recov,: 110 94 95 108 <br /> LCS 50.150 50.150 50.150 50-150 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 /> -LwLvLL `� 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 /> lianne Fegley MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference <br /> Project Manager <br /> 9010006,GET <7> <br />