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SEQUOIA ANALYTICAL <br /> l 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 • FAX (510) 686-9689 <br /> o`ux Associates then"t Project lDf YAr`co 20� -33=i ` <br /> 1855 Gateway Blvd , Ste 770 Matrix Soil <br /> Concord, CA 94520 <br /> ' Attention Paul Supple OC Sample Group #3071301 Reported Aug 13, 1993 <br /> ,w.M1,.v.-{..Y�Y,,r ., ., 4 .,f A .ter: ..,..,'r• , � .. ,. �- ,, r , <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> STLC Lead <br /> Method. EPA 7421 <br /> Analyst- K v S <br />' Conc Spiked 10 <br /> Units mg/L <br />' LCS Batch#. BLK081093 <br /> Date Prepared 8/10/193 <br /> Date Analyzed 8/12/93 <br />'Instrument 1.13 # SpectrAA-400 <br /> LCS °.6 <br /> Recovery 82 <br /> Control Limits 75-125 <br /> fr re,rrr J r ~ , 44 S t v t u u,,, t ♦, n r { f ., t ~4 , {, ,` r fM1 <br /> MS/MSD <br />' Batch # 3071131 <br /> Date Prepared: 8/10/93 <br /> Date Analyzed 8/12/93 <br />'Instrument LD # SpectrAA-400 <br /> Matrix Spike <br />' % Recovery 102 <br /> Matrix Spike <br />' Duplicate % <br /> Recovery 112 <br /> Relative% <br />' Difference 93 <br /> kEOU01A N YT[CAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> 4magiaration 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 OC limits for MS/MSD's are advisory only <br /> Kenneth K F Lee and are not used to accept or reject batch results <br /> Laboratory Director <br />' #3071301 ROU <2> <br />