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Ir <br /> Sequoia 680 Chesapeake Drive Redwood City.CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404N.WiSet Lane Wainur Creek,CA 94598 (975)988-9600 FAX(925)988-9673 <br /> Analytical <br /> III Striker Avenue,Suite 8 Sacramento,CA 95834 (116)9 21-9600 FAX(916)922-0]00 <br /> 1455 McDowell Blvd. North. Ste.D Petaluma.CA 94954 (707) 79Z-1865 FAX(707)792-034Z <br /> MCON"-""Sac ........Client Pr0j'e­c­H7D-'::"­' ARCO­2186, 8166ki 'n' ," A <br />]':.:'1433 N. Market Blvd. Matrix: Water <br />..:Sacramento. CA 95834 <br /> Attention., Dave Foley QC Sample Group- S809241 Reported: Oct 8, 1998 :.."' <br /> QUALITY CONTROL DATA REPORT <br /> MTBE MTBE <br /> Method: EPA 8260 EPA 8260 <br /> Analyst: N. Nelson N. Nelson <br /> Concentration <br /> Spiked: 50 pg/L 50 pg/L <br /> LCS Batch#: LCS 10/6/98 LCS100798 <br /> Date Prepared: 10/06/98 10/07/98 <br /> Date Analyzed: 10106198 10/07/98 <br /> Instrument I.D.#: GC/MS-2 GC/MS-2 <br /> LCS % <br /> Recovery: 110 104 <br /> Control Limits: 65-135% 65-135% <br /> x......... <br /> MSIMSD <br /> Batch #: 8100408 8100408 <br /> Date Prepared: 10/07/98 10/07198 <br /> Date Analyzed: 10/07/98 10/07/98 <br /> Instrument I.D.#: GC/MS-2 GC/MS-2 <br /> Matrix Spike <br /> % Recovery: 102 102 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 106 106 <br /> Relative % <br /> Difference: 3.8 3.8 <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 LCS% recovery data is used for <br /> validation Of sample batch results. Due to matrix effects,the QC limits for MS/MSO's are advisory only <br /> and are not used to accept or reject batch results-. <br /> Ran W. Bobel <br /> Project Manager/Sacramento Laboratory <br /> S809241.EMC <4> <br />