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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> uxAssociates` v v f Client Project ID ARC042093-�3Ai Tracy <br /> 1855 Gateway Blvd , Ste 770 Matrix Sod <br /> Concord, CA 94520 <br /> Attention Paul S- ple QC Sample Group 307-0921 Reported Jul 30, 1993 <br /> 1 , r. .. <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE STI_C <br /> Lead <br /> Method EPA 7421 <br /> Analyst. K.v S <br /> Conc. Spiked 10 <br /> Units. mg/L <br /> LCS Batch# BLK072793 <br /> Date Prepared 7/27/93 <br /> IDate Analyzed: 7/30/93 <br /> nstrument I D #. SpectrAA-400 <br /> LCS y <br /> Recovery 100 <br /> Control Limits 75-125 <br /> xM `t s <br /> x}ui•i~�,i vv l v, ` 4 + u v i n ti 4 r J ,.r r r .. r nt', i 1 v 4 v I v <br />' MS/MSD <br /> Batch# 3070921 <br /> Date Prepared 7/27/93 <br /> IDate Analyzed. 7/30/93 <br /> nstrument I D#: SpectrAA-400 <br />' Matrix Spike <br /> %Recovery so <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 84 <br />' Relative% <br /> Difference- 49 <br /> VEQUOIA 4ANA YTICAL Please Note <br /> The LCS is a control sample of known,Interferent free matrix that is analyzed using the same reagents, <br /> oreDaratjqQ.Lnd-vna.lytica1 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 /> Lenneth K F Lee and are not used to accept or reject batch results <br /> Laboratory Director <br />' #3070921 ROU <2> <br />