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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 • FAX (916) 921-0100 <br /> rown & Caldwell Client Project ID Arco 2133-94-5, Stockton <br /> 0 Box 13449 Matrix Water <br /> Sacramento CA 95813-3449 <br /> Attention Mindy Wright OC Sample Group 404-0380 Reported Apr 20, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Cadmium Chromium Copper Lead Nickel Znc <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#• LCSO41594 LCSO41594 LCSO41594 LCSO41594 LCSO41594 LCSO41594 <br /> Date Prepared. 4/15/94 4/15/94 4/15/94 4/15/94 4/15/94 4/15/94 <br /> Date Analyzed: 4/15/94 4/15/94 4/15/94 4/15/94 4/15/94 4/15/94 <br /> Instrument I D # PE-40 PE-40 PE-40 PE-40 PE-40 PE 40 <br /> LCS % <br /> Recovery- 91 94 97 97 94 94 <br /> Control Limits: 80.120 80-120 80,124 80.120 80,120 80.120 <br /> MS/MSD <br /> Batch#: 4040297 4040297 4040297 4040297 40402U 40402P <br /> Date Prepared: 4/15/94 4/15/94 4/15/94 4/15/94 4/15/94 4/15/94 <br /> Date Analyzed: 4/15/94 4/15/94 4/15/94 4/15/94 4/15/94 4/15/94 <br /> Instrument I.D.#: PE40 PE-40 PE-40 PE-40 PE-40 PE-40 <br /> Matrix Spike <br /> %Recovery: 87 88 95 87 89 89 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 92 90 98 97 91 95 <br /> Relative% <br /> Difference 56 22 31 11 22 65 <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 matnx effects,the QC limits for MS/MSD's are advisory only <br />&A C.L C and are not used to accept or re eot batch results <br /> Craig C te <br /> Project Manager <br /> 4040360 SRS <4> <br />