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Sequoia 819 Straker Avenue 59583 8 <br /> Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> Cambria Environmental Client Project ID Shell, 440 W Charter Way, Stockton, CA <br /> 270 Perkins Street Matrix Soil <br /> Sonoma, CA 95476 <br /> Attention Wayne Chiu QC Sample Group S906417 Reported Jul 9, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTF- <br /> Lead <br /> Method EPA 6010 <br /> Analyst J Kelly <br /> Concentration <br /> Spiked 50 mg/kg <br /> LCS Batch# LCS063099A <br /> Date Prepared 06/30/99 <br /> Date Analyzed 06/30/99 <br /> Instrument I D # MV-3 <br /> LCS % <br /> Recovery 102 <br /> Control Limits 80-120% <br /> MSIMSD <br /> Batch # 9062250 <br /> - - Date Prepared - 06/30/96 - T - - - -- - - - -- - - - - - --- - -- - - <br /> Date Analyzed 06/30/99 <br /> Instrument I D # MV-3 <br /> Matrix Spike <br /> % Recovery 103 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 103 <br /> Relative % <br /> Difference 00 <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/MSD's are advisory only <br /> y�f)r! -C( and are not used to accept or refect batch results <br /> Sandra R Hanson 1 <br /> Project Manager/Sacramento Laboratory <br /> 5906417 CES <2> <br />