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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-%00 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> ATC Associates, Inc Client Project ID Thlemann's Service <br /> 1117 Lone Palm Avenue Matrix Solid <br /> Modesto, CA 95351-1502 <br /> Attention Jeanne Homsey Work Order# 9811618-01-05 Reported Nov 24, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch#. M81 11 198MTBEEXA <br /> Analy. Method EPA 8240 <br />' Prep Method. N A. <br /> Analyst T Costello <br /> IVIS/MSD # 981160402 <br /> Sample Conc ND <br /> Prepared Date 11/11/98 <br /> Analyzed Date 11/12/98 <br />' Instrument I D # H6 <br /> Conc. Spiked 2500pg/Kg <br /> Result 2300 <br /> MS%Recovery* 92 <br /> Dup Result* 2200 <br />' MSO % Recov 88 <br /> RPD 44 <br /> RPD Limit 0-25 <br />' LCS# <br /> Prepared Date <br /> Analyzed Date <br /> t Instrument I D.# <br /> Conc Spiked <br /> LCS Result <br />' LCS % Recov .. <br />' 60-140 <br /> LCS 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 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 enure analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> f interference,the LCS recovery is to be used to validate the batch <br />' Ka imyal <br /> Project Ma r *" MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9811618 AAA -2> <br />