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Sequoia 690 Chesapeake Drive Redwood City,CA 94063 (650) 364.9600 FAX(650)364-9233 <br /> 404 N.Viget Lane Walnut Creek,CA 94598 (510) 988-9600 JAX(510)988.9673 <br /> Analytical <br /> gig Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)92 1.O 100 <br /> - l <br /> ti <br /> .......... <br /> ............ <br /> ....Cambria Client Project ID: Shell 1267 Country Club Blvd <br /> 270 Perkins Ave. Matrix: Solid - <br /> CA 95476 <br /> Mar 10, 1998�' <br /> ...Attention: Joe Neely -01-06 <br /> ... Work Order#: 9802D58 Reported: <br /> .......... <br /> ............ <br /> ................... .......... <br /> ............... ...................I...... <br /> QUALITY CONTROL DATA REPORT , <br /> Analyte. MTBE <br /> QC Batch#: MS022398MTBEEXA <br /> Analy. Method: EPA 8260 <br /> Prep. Method: N.A. <br /> Analyst: M.Williams <br /> MS/MSD#: . 9802C9304 <br /> Sample Conc.: N.D. <br /> Prepared Date: 2/23/98 <br /> Analyzed Date: 2/24/98 <br /> Instrument I.D.#: F3 <br /> Conc. Spiked: 2500 Mg/Kg <br /> Result: 2000 <br /> MS% Recovery: 80 <br /> Dup. Result: 2000 <br /> MSD % Recov.: 80 <br /> RPD: 0.0 <br /> RPD Limit: 0-25 <br /> . .... ................... ... . ............ <br /> .......................... ...... X X <br /> -:1: -N ................. <br /> ............ <br /> .......... <br /> .......................... ................ <br /> .............................. ............................ <br /> LCS#: LCS022498 <br /> Prepared Date: 2/24/98 <br /> Analyzed Date: 2/24/98 <br /> Instrument I.D.#: F3 <br /> Conc. Spiked: 2500 jig/Kg <br /> LCS Result: 1900 <br /> LCS %Recov.: 76 <br /> MS/MSD 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 /> SEQUO ALYTICAL 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 /> regory <br /> Manager <br /> oJect Manager MS=Matrix Spike, MSD=IVIS Duplicate, RPD=Relative%Difference 9802D58.CCC <6> <br />