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` SEQUOIA ANALYTICAL - - --- <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> iBrown &Caldwell Client Project ID Arco 2133-93-5, Stockton n <br /> P O Box 13449 Matrix Water <br /> Sacramento, CA 95813-3449 <br /> Attention Mindy Wright QC Sample Group 311-0494 Reported Nov is. 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Lead Nickel Zinc <br /> Method EPA 200 7 EPA 200 7 EPA 200 7 <br /> Analyst S Foster S Foster S Foster <br /> MS/MSD <br /> Batch# 3110494 3110494 3110494 <br /> Date Prepared 11/16/93 11/16/93 11/16/93 <br /> Date Analyzed 11/17/93 11/17/93 11/17/93 <br /> Instrument I D # PE-40 PE-40 PE-40 <br /> Conc Spiked 0 10 mg/L 010 mg/L a 10 mg/L <br /> Matrix Spike <br /> % Recovery: 87 86 87 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 96 100 95 <br /> Relative% <br /> Difference 23 34 00 <br /> LCS Batch# - <br /> Date Prepared . <br /> Date Analyzed . <br /> Instrument ID # - <br /> LCS % <br /> Recovery - <br /> % Recovery <br /> Control Limits 80-120 80-120 80-120 <br /> Please Note <br /> The LCS is a control sample of known,interferent tree matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Linda C Schneider <br /> Project Manager 3110494 BRS <4> <br />