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F <br /> 1 <br /> Sequoia 680 Chesapeake Drive Redwood Clty 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 /> 819 5tr,ker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical t455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> ATC Associates, Inc Client Project ID Ripon United School <br /> 1260 Graphics Drive Matrix Solid <br /> Modesto, CA 95351-1502 <br /> Attention Drew Van Allen Work Order# 9809E04 01-08 Reporter! Oct 1, 1998 <br />' QUALITY CONTROL DATA REPORT <br />' Analyte' MTBE <br /> QC Batch#. MS092598MTBEEXA <br /> Anally Method: EPA 8260 <br />' Prep Method: <br /> Analyst: L Zhu <br />' MS/MSD #: 980989115 <br /> Sample Cone : ND <br /> Prepared Date. 9/25/98 <br /> Analyzed Date: 9/25/98 <br />' Instrument 1.13 #: F2 <br /> Cone Spiked: 2500 ug/Kg <br /> Result; 2700 <br /> MS% Recovery: 108 <br /> Dup Result: 2600 <br />' MSD % Recov : 104 <br /> RPD: 38 <br /> RPD Limit: 0-25 <br /> 1 <br />' LCS #- LCS092598 <br /> Prepared Date: 9/25/98 <br /> Analyzed Date: 9/26/98 <br />' Instrument I D #: F2 <br /> Cone Spiked: 2500ug/Kg <br />' LCS Result. 2400 <br /> LCS % Recov .. 96 <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 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 Kimya <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9809E04 AAA <1> <br />