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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 Project ID Arco 2133-94-5 Stockton <br /> P Q Box 13449 Matrix Water <br /> Sacramento CA 95813-3449 <br /> Attention Mindv Wright CC Sample Group 402-1242 Reported Mar 10 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Cadmium Chromium Copper 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 1 0 mg/L 1 0 mg/L 1 0 mg/L 1 0 mg/L 1 0 mg/L <br /> LCS Batch# LCS030794 LCS030794 LCS030794 LCS030794 LCS030794 LCS030794 <br /> Date Prepared 3/7/94 3/7/94 3/7/94 3/7/94 3/7/94 3/7/94 <br /> Date Analyzed 3/8/94 3/8/94 3/8/94 3/8/94 3/8/94 3/8/94 <br /> Instrument I D.# PE 40 PE 40 PE 40 PE 40 PE 40 PE 40 <br /> LCS <br /> Recovery 89 93 96 92 93 92 <br /> Control Limits 80-120 80-120 80-120 80-120 80-120 80-120 <br /> MS/MSD <br /> _ <br /> Batch #' 4021350 4021350 4021350 4021350 4021350 4021350 <br /> Date Prepared: 3/7/94 3/7/94 3/7/94 3/7/94 3/7/94 3/7/94 <br /> Date Analyzed 3/8/94 3/8/94 3/8/94 3/8/94 3/8/94 3/8/94 <br /> Instrument I D #. PE-40 PE-40 PE-40 PE-40 PE 40 PE 40 <br /> Matrix Spike <br /> % Recovery 92 94 101 91 98 99 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 86 90 93 85 92 90 <br /> Relative % <br /> Difference 67 4 3 82 68 63 95 <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 MS/MSDs are advisory only <br /> C'j C_ C e` r J 4, and are not used to accept or reject batch results <br /> 0 <br /> Craig C I <br /> Project Manager <br /> 4021242 S RS <4> <br />