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Sequoia <br />Analytical <br />wesapeake Drive <br />404 N. Wiget Lane <br />819 Striker Avenue, Suite 8 <br />1455 McDowell Blvd. North, Ste. D <br />Redwood City, CA <br />Walnut Creek, CA 94598 <br />Sacramento, CA 95834 <br />Petaluma, CA 94954 <br />(650)364-9600 <br />(925)988-9600 <br />(916)921-9600 <br />(707)792-1865 <br />FAX(650)364-9233 <br />FAX (925) 988-9673 <br />FAX(916)921-0100 <br />FAX(707)792-0342 <br />...::>>::>:eiin :;::;::::::ii nt pr t Ib: uik St 124 Mantec <br />Alio' n Geosc a ce ���� � C e ojec C� op# a <br />30-A Lindbergh Ave. Matrix: Solid <br />Livermore, CA 94550 <br />Attention: Katy Racke QC Sample Group: 810-0690 Reported: Oct 12, 199E <br />........................................................................................................................................................................................................................................................................................ . <br />....................................................................................................................................................................................................................................................................................... . <br />ANALYTE <br />MTBE <br />Method: <br />EPA 8260 <br />Analyst: <br />A. Kemp <br />MS/MSD <br />Batch#: 8100369 <br />Date Prepared: <br />10/9/98 <br />Date Analyzed: <br />10/10/98 <br />Instrument I.D.#: <br />GC/MS-2 <br />Conc. Spiked: <br />2500 Ng/kg <br />Matrix Spike <br />% Recovery: <br />96 <br />Matrix Spike <br />Duplicate % <br />Recovery: <br />108 <br />Relative % <br />Difference: <br />12 <br />LCS Batch#: LCS100998 <br />Date Prepared: 10/9/98 <br />Date Analyzed: 10/9/98 <br />Instrument I.D.#: GC/Ms-2 <br />LCS % <br />Recovery: 100 <br />Recovery <br />Control Limits: 70-130 <br />SEQUOIA -ANALYTICAL, #1271 <br />Julianne Fegley <br />Project Manager <br />'lease Note: <br />The LCS is a control sample of known, interferent free matrix that is analyzed using the same reagents, <br />)reparation, and analytical methods employed for the samples. The matrix spike is an aliquot of sample <br />ortified with known quantities of specific compounds and subjected to the entire analytical procedure. If <br />he recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br />nterference, the LCS recovery is to be used to validate the batch. <br />8100690.ALT <2> <br />