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is l <br /> ID <br /> Sequoia 660 Chesapeake Drive Redwood City CA 94463 (650) 364 9600 FAX(654)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 986 9640 FAX(510)988 9673 <br /> Analytical 619 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> EMCON Client Project ID ARCO 548, Stockton, CA <br /> 1433 N Market Blvd Matrix Sall <br /> Sacramento, CA 95834 <br /> Attention Mark Capps QC Sample Group 8020225-0233 Reported Mar 5, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Lead MTBE <br /> Method EPA 6010A EPA 8260 <br /> Analyst S Phillips M Williams <br /> Concentration <br /> Spiked 50 mg/kg 2,500 ug/kg <br /> LCS Batch# LCS021898 VMB0219S <br /> Date Prepared 02/18/98 02/19/98 <br /> Date Analyzed 02/25/98 02/19/98 <br /> Instrument I D # ICP-1 H6 <br /> • LCS <br /> Recovery 94 80 <br /> Control Limits 80-120% 70130% <br /> MS/MSD <br /> Batch # 8020308 98021321-06 <br /> Date Prepared 02/18/98 02/17/98 <br /> Date Analyzed 02/25/98 02/18/98 <br /> Instrument I D # ICP-1 F3 <br /> Matrix Spike <br /> % Recovery 92 84 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 92 84 <br /> Relative % <br /> Difference 00 00 <br /> Please Note <br /> JffiThe LCS is a control sample of known interferent free matrix that is analyzed using the same reagents, <br /> UOIA ANALYTIC L ? 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/MSD s are advisory only <br /> and are not used to accept or reect batch results <br /> Ronald W Bobel <br /> Project Manager/Sacramento Laboratory <br /> 8020225A EMG <11> <br />