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Enseco DUPLICATE CONTROL SAMPLE REPORT Amended Metals Analysis and Preparation Concentration Accuracy(%) Precision Analyte Spiked Measured AVG Limits (RPD) DCS1 DCS2 AVG DCS Limit Category: PB-FAA-A Matrix: AQUEOUS QC Lot: 01 MAR 89-A Concentration Units: mg/L Lead 0.020 0.0211 0.0213 0.0212 106 82-115 0.0 11 Category: ICP-A Matrix: AQUEOUS QC Lot: 31 MAR 89-A Concentration Units: mg/L Aluminum 2.00 1 .95 1.96 1 .96 98 85-115 0.0 10 Antimony 0.50 0.512 0.508 0.510 102 85-115 0.0 10 Arsenic 2.0 1.91 1 .91 1.91 96 85-115 0.0 10 Barium 2.0 2.00 2.012.005000 100 85-115 0.0 10 Beryllium 0.050 0.0519 0.0519 0.0519 104 80-115 0.0 10 Boron 1 .0 1 .01 1 .00 1 .00 100 85-115 1 .0 10 Cadmium 0.050 0.0445 0.0451 0.0448 89 80-117 1 .1 10 Calcium 100 95.7 95.7 95.7 96 85-115 0.0 10 Chromium 0.20 0.191 0.188 0.190 95 85-115 2. 1 10 Cobalt 0.50 0.481 0.479 0.480 96 85-115 0.0 10 Copper 0.25 0.241 0.241 0.241 96 85-115 0.0 10 Iron 1 .0 0.950 0.955 0.952 95 85-115 1 .0 10 Lead 0.50 0.478 0.446 0.462 92 85-115 7.6 10 Lithium 0.20 0.198 0.203 0.200 100 85-115 3.0 10 Magnesium 50 47.5 47.7 47.6 95 85-115 0.0 10 Manganese 0.50 0.471 0.472 0.472 94 85-115 0.0 10 Molybdenum 0.20 0.189 0. 191 0.190 95 85-115 2.1 10 Nickel 0.50 0.462 0.435 0.448 89 83-115 5.6 10 Potassium 50 45.3 45.3 45.3 91 83-115 0.0 10 Selenium 2.0 1.86 1.93 1 .90 94 85-115 3.2 10 Silver 0.050 0.0472 0.0461 0.0466 93 56-116 2.2 35 Sodium 100 97.6 98.3 98.0 98 85-115 0.0 10 Thallium 2.0 2.07 2.09 2.08 104 84-118 0.0 10 Tin 0.40 0.366 0.371 0.368 92 80-115 1 .1 15 Titanium 0.20 0.202 0.203 0.202 101 85-115 1 .0 10 Vanadium 0.50 0.472 0.471 0.472 94 82-115 0.0 20 Zinc 0.50 0.452 0.452 0.452 90 80-115 0.0 20 Calculations are performed before rounding to avoid round-off errors in calculated results.