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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988 9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0 100 <br /> 455 McDowell Blvd North Ste D Petaluma CA 94954 (707) 792-1865 FAX(707}797 0342 <br /> Analytical '1551 Industrial Road San Carlos CA 94070 41 1 1 (650) 232-9600 FAX(650)232-9612 <br /> WCOR International Client Project IO ARCO 2133, Stockton, CA <br /> 9912 Business Park Dr , Ste 100 Matrix Soil <br /> Sacramento, CA 95827 <br /> Attention Rusty Benkosky QC Sample Group S903219 Reported Mar 31, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Lead Lead <br /> Method EPA 6010 EPA 6010 <br /> Analyst J Kelly J Kelly <br /> Concentration <br /> Spiked 50 mglkg 50 mg/kg <br /> LCS Batch# LCS032599A LCS032599A <br /> Date Prepared 03/24/99 03/25/99 <br /> Date Analyzed 03/27/99 031127199 <br /> Instrument I D# MV-4 MV-4 <br /> LCS % <br /> Recovery 88 98 <br /> 0Control Limits 80-120% 80-120% <br /> MS/MSD <br /> Batch # 903112 9032428 <br /> Date Prepared 03/24/99 03/25/99 <br /> Date Analyzed 03/25/99 03/27/99 <br /> Instrument I D# MV-4 MV-4 <br /> Matrix Spike <br /> % Recovery 90 102 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 80 92 <br /> Relative % <br /> Difference 80 58 <br /> ease Note <br /> The LCS 1s a control sample of known, interferent free matrix that 1s analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples The LCS%recovery data 1s used for <br /> 1 � + validation of sample batch results Due to matrix effects the QC limits for MS/MSD's are advisory only <br /> /J,_1 J and are not used to accept or refect batch results <br /> &ndra R Hanson <br /> oject Manager/Sacramento Laboratory <br /> 5903219 SES <4> <br />