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y 819 Striker Avenue, Suite 8 <br /> � Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(91 G)92I-0100 <br /> SECOR International Client Project ID:` ARCO 434, Lodi, CA <br /> 9912 Business Park Dr., Ste. 100 Matrix: Soil <br /> Sacramento, CA 95827 <br /> Attention: Rusty Benkosky QC Sample Group: S906335 Reported: Jul 8, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Lead <br /> Method: EPA 6010 <br /> Analyst: J.Kelly <br /> Concentration <br /> Spiked: 50 mg/kg <br /> LCS Batch#: LCS063099 <br /> Date Prepared: 06/30/99 <br /> Date Analyzed: 07/05/99 <br /> Instrument I.D.#: My-3 <br /> LCS % <br /> Recovery: 106 <br /> Control Limits: 80-120% <br /> MS/MSD <br /> Batch#: 9062274 <br /> Date Prepared: 06/30/99 <br /> Date Analyzed: 07/05/99 <br /> Instrument I.D.#: My-3 <br /> Matrix Spike <br /> % Recovery: 102 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 94 <br /> Relative % <br /> Difference: 7.5 <br /> PleaseNote: <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 /> 1 validation of sample batch results. Due to matrix effects,the CC limits for MS/MSD's are advisory only <br /> e y�/ // �� and are not used to accept or reject batch results. <br /> Sandra R. Hanson <br /> Project Manager/Sacramento Laboratory <br /> S906335.SES <3> <br />