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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 (510) 988 9600 FAX(510)988-9673 <br /> Analytical 819 Sinker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921 0100 <br /> Blame Tech Services, Inc Client Project ID $hell Stockton f 971224-D1 <br /> i,1680 Rogers Ave Matrix Liquid <br /> ,``San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9712F98-02 Reported Jan u14, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# M6123097MTBEI-I6A <br /> Analy Method. EPA 8260 <br /> Prep Method NA <br /> Analyst. L Zhu <br /> MS/MSD# 9712F5003 <br /> Sample Conc • N D <br /> Prepared Date. 12/30/97 <br /> Analyzed Date 12/30/97 <br /> Instrument I D # lis <br /> Conc Spiked 50Ng/L <br /> Result 46 <br /> MS %Recovery- 92 <br /> Dup. Result 47 <br /> MSD % Recov.: 94 <br /> RPD 22 <br /> RPD Limit: 0-25 <br /> LCS #: LCS123197 <br /> Prepared Date. 12/31/97 <br /> Analyzed Date- 12/31/97 <br /> instrument 1 D # F2 <br /> Conc Spiked 50ug/L <br /> LCS Result 55 <br /> LCS % Recov 110 <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 /> O 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 /> P enner <br /> Pro ct Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9712F98 SLA <5> <br /> 7:3 <br />