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- = - SEQUOIA ANALYTICAL - <br /> 819 Striker Avenue Suite 8 • Sacramento CA 95834 <br /> (9 16) 921 9600 * FAX (916) 921 0100 <br /> Brown & Caldwell Client Project ID Arco 2133-93-5, Stockton <br /> 723 S St Matrix Water <br /> Sacramento, CA 95814 <br /> Attention Mindy Wright QC Sample Group 309-0404 Reported Sep 16, 1993 <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 0 10 mg/l. 0 10 mg/L 0 10 mg/L 0 50 mg/L 0 20 mg/L 0 10 mg/L <br /> LCS Hatch# LCS091693 LCS091693 LCS091693 LCS091693 LCS091693 LCS091693 <br /> Date Prepared 9/16/93 9/16/93 9/16/93 9/16/93 9/16/93 9/16/93 <br /> Date Analyzed 9/16/93 9/16/93 9/16/93 9/16/93 9/16/93 9/16/93 <br /> Instrument I D # PE-40 PE 40 PE 40 PE-40 PE-40 PEAO <br /> LCS % <br />® Recovery 116 94 109 107 109 97 <br /> Control Limits 80-120 80.120 80.120 80-120 80-120 60-120 <br /> MS/MSD <br /> Batch # 3090406 3090406 3090406 3090406 3090406 3090406 <br /> Date Prepared 9/16/93 9/16/93 9/16/93 9/16/93 9/16/93 9/16/93 <br /> Date Analyzed 9/16/93 9/16/93 9/16/93 9/16/93 9/16/93 9/16/93 <br /> Instrument I D # PE-40 PE40 PE-40 PE-40 PE-40 PE-40 <br /> Matrix Spike <br /> % Recovery 101 100 105 98 101 98 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 91 90 95 89 90 66 <br /> Relative % <br /> Difference 10 11 10 96 12 13 <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 /> r <br /> validation of sample batch results Due to matrix effects the OC limits for MS/MSD s are advisory only <br /> and are not used to acce t or reject batch results <br /> i Linda C Schneider <br /> Project Manager 3090404 EMS <4> <br />