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+ r` Sequoia 480 Chesa eake Drive Redwood Ci CA 9e <br /> 4 F 4. (650) 364-9600 FAX(650)364-9233 <br /> 404 N.Wiget Lane Walnut Creek,CA 945 8 (510) 988.9600 FAX(510)988-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921.9600 FAX(916)921.0100 <br /> .:Blaine ............................. <br /> T:::....: <br /> ech <br /> Servic <br /> es n <br /> c <br /> ect - <br /> 9 4 2::»::::> <br /> 5 71 <br /> 1 / XX <br /> 1680 Rogers Ave. Matrix: Liquid <br /> :San Jose, CA 95112 <br /> :::::Attention: Fran Thie Work Order#: 9711094 -01-04 Reported: Dec '1, 1997-' <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: MTBE <br /> QC Batch#: MS110797MTBEH6A <br /> Analy. Method: EPA 8240 <br /> Prep. Method: N.A. <br /> Analyst: M.Williams <br /> MS/MSD #: 971103401 <br /> Sample Conc.: N.D. <br /> Prepared Date: 11/7/97 <br /> Analyzed Date: 11/7/97 <br /> Instrument I.D.#: HIS <br /> Conc. Spiked: 50pg/L <br /> Result: 53 <br /> MS % Recovery: 106 j <br /> Dup. Result: 55 <br /> MSD%Recov.: 110 <br /> RPD: 3.7 <br /> RPD Limit: 0-25 <br /> LCS#: LCS110797 <br /> Prepared Date: 11/7/97 <br /> Analyzed Date: 11/7/97 <br /> Instrument I.D.#: H6 <br /> Conc. Spiked: 50Ng/L <br /> LCS Result: 52 <br /> LCS % Recov.: 104 <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 /> S U 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 Penner **MS Matrix Spike,MSD MS Duplicate,RPD Relative%Difference <br /> Project Manager 9711094.13LA <1> <br /> i <br />