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1 <br /> Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364.9600 FAX (650)364-9233 <br /> 404 N.Wiget Lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)989-9673 <br /> 819 Striker Avenue,Suite 8 5aeramento,CA 95834 (916) 921-9600 FAX(916)921-0100 <br /> Analytical <br /> ..ATC Client Project ID: 15598, D'Arcy Road Lathrop <br /> 1260 Graphics Drive Matrix: Liquid <br /> ' Modesto CA 95351-1502 <br /> :Attention Jeanne Homsey Work Order #: 9803H14-10 Reported: Apr 3, 1998;,: <br /> ., <br /> !'3QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes Gas <br /> ' Benzene <br /> QC Batch#: GCO32698STEX21A GCO32698BTEX21A GCO32698BTEX21A GCO32698BTEX21A GC03269813TEX21A <br /> Analy. Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep. Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst: C. DeMartini C. DeMartini C.DeMartini C. De Martini C. De Martini <br /> MS/MSD #: 9803C4406 9803C4406 980304406 9803C4406 980304406 <br /> Sample Conc.: N.D. N.D. N.D. N.D. N.D. <br /> Prepared Date: 3/26/98 3/26/98 3/26/98 3/26/98 3/26/98 <br /> Analyzed Date: 3/2s/sa 3/26/sa 3/zs/9s 3/26/98 3/26/98 <br /> Instrument I.D.#: GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> ' Conc. Spiked: 10pg/L 10 ug/1- 10yg/L 30Mg/L 60pg/L <br /> Result: 7.7 8.7 9.9 30 54 <br /> MS %Recovery: 77 87 99 100 90 <br /> Dup. Result: 6.9 7.8 8.8 27 48 <br /> MSD% Recov.: 69 78 88 90 80 <br /> RPD: 11 11 12 11 12 <br /> RPD Limit: 0-25 0-25 0-25 0-25 0-25 <br /> l' <br /> R. LCS #: ELK032698 BLK032698 BLK032698 BLK032698 BLK032698 <br /> Prepared Date: 3/26/98 3/26/98 3/26/98 3/26/98 3/26/98 <br /> Analyzed Date: 3/26/98 3/26/98 3/26/98 3/26/98 3/26/98 <br /> Instrument I.D.#: GCHP21 GCHP21 GCHP21 GCHP21 GCHP21 <br /> Canc. Spiked: loug/L 10ug/L 10ug/L 30,ug/L 60ug/L <br /> LCS Result: 7.5 8.5 9.7 29 52 <br /> ' LCS % Recov.: 75 85 97 97 87 <br /> 60-140 60-140 60-140 60-140 60-140 <br /> ' LCS 70-130 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> i Please Nate: <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL 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 /> Ka an Kimyal <br /> Project Manager **MS Matrix Spike,MSD MS Duplicate,RPD=Relative%Difference 9803H14-AAA S4> <br />