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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue Suite 8 • Sacramento CA 95834 <br /> (916) 921 9600 FAX (916) 921 0100 <br /> Brown & Caldwell Client Prosect ID Arco 2133-94-5 Stockton <br /> P O Box 13449 Matrix Water <br /> Sacramento CA 95813-3449 <br /> Attention Mindv Wright OC Samoie Group 403-0688 departed Mar 30 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Cadmium Chromium Capper Lead Nickel Zinc <br /> Method- EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 <br /> Analyst S Foster S Foster S Foster S Foster S Foster S Foster <br /> Concentration <br /> Spiked 1 0 mg/L 0 mg/L 0 mg/L i 0 mg/L 1 0 mg/L 1 0 mg/L <br /> LCS Batch# LCS032894 LCS032894 LCS032894 LCS032894 LCS032894 LCS032894 <br /> Date Prepared 3/28/94 3/28/94 3/28/94 3/28/94 3/28/94 3/28/94 <br /> Date Analyzed: 3/30/94 3/30/94 3/30/94 3/30/94 3/30/94 3/30/94 <br /> Instrument I.D # PE-40 PE 40 PE 40 PE-40 PE 40 PE-40 <br /> LCS <br /> Recovery' 94 92 93 94 88 89 <br /> Control Limits: 80.120 80-120 80-120 80-120 80-120 80-120 <br /> MS/MSD <br /> Batch#'4030716 4030716 4030716 4030716 4030716 4030718 <br /> Date Prepared: 3/28/94 3/28/94 3/28/94 3/28/94 3/28/94 3/28/94 T <br /> Date Analyzed: 3/30/94 3/30/94 3/30/94 3/30/94 3/30/94 3/30/94 <br /> Instrument I.D.#• PE-40 PE-40 PE-40 PE-40 PE-40 PE-40 <br /> Matrix Spike <br /> % Recovery: 95 98 98 91 90 94 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 93 96 95 89 88 91 <br /> Relative % <br /> Difference: 21 21 31 22 22 32 <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 LCS%recovery data is used for <br /> validation of sample batch results Due to matrix effects the QC limits for MS/MSO s are advisory only <br /> GG.-L- and are not used to accept or reject batch results <br /> Craig C tde <br /> Project Manager <br /> 4030688 SRS <4> <br />