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Sequoia 660 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wlget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)908-9673 <br /> Analytical 819 Striker Avenue Suite 0 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> lqettler-Ryan Client Project ID Tosco BI5 11193 Stockton CA <br /> 1 , <br /> 3164 Gold Camp Dr, Suite 240 Matrix Soil <br /> Rancho Cordova, CA 95670 <br /> Attention Todd Del Frate QC Sample Group S812361 Reported ,tan 5, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Lead <br /> Method EPA 6010A <br /> Analyst PET <br /> Concentration <br /> Spiked 50 0 mglkg <br /> LCS Batch# 8720697-BS1 <br /> Date Prepared 12/31/98 <br /> Date Analyzed 12131198 <br /> Instrument I D# - <br /> LCS % <br /> Recovery 892 <br /> Control Limits 800-120 <br /> MS/MSD <br /> Batch# P812410-01 <br /> Date Prepared 12/31/98 <br /> Date Analyzed 12/31/98 <br /> Instrument I D# - <br /> Matrix Spike <br /> % Recovery 869 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 886 <br /> Relative % <br /> Difference 194 <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 MSIMSD's are advisory only <br /> �f/�G��'i � ✓u1 and are not used to accept or reject batch results <br /> da C Schneider <br /> rolect Manager/Sacramento Laboratory <br /> S812361 GRR t2> <br />