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Enseco SEP 4 991 A Coming Compam DUPLICATE CONTROL SAMPLE REPORT ENVIRONMENTAL HEALTH Metals Analysis and Preparation PERMIT/SERVICES Concentration Accuracy Precision Analyte Spiked Measured Average(%) (RPD) DCS1 DCS2 AVG DCS Limits DRP' Category: PB-FAA-AT Matrix: AQUEOUS QC Lot: 07 AUG 91-W Concentration Units: mg/L Lead 0.020 0.0221 0.0226 0.0224 112 82-115 2.2 11 Category: ICP-AT Matrix: AQUEOUS QC Lot: 14 AUG 91-X Concentration Units: mg/L Aluminum 2.00 1.99 1.98 1.98 99 85-115 0.5 10 Antimony 0.50 0.470 0.476 0.473 95 85-115 1 .2 10 Arsenic 0.5 0.480 0.484 0.482 96 85-115 0.8 10 Barium 2.0 1 .99 1 .98 1 .99 99 85-115 0.2 10 Beryllium 0.050 0.0508 0.0508 0.0508 102 80-115 0.0 10 Boron 1.0 0.971 1.01 0.991 99 85-115 4. 1 10 Cadmium 0.050 0.0537 0.0520 0.0528 106 81-118 3. 1 10 Calcium 100 105 105 105 105 85-115 0.2 10 Chromium 0.20 0.189 0.191 0. 190 95 85-115 0.9 10 Cobalt 0.50 0.489 0.493 0.491 98 85-115 0.6 10 Copper 0.25 0.251 0.251 0.251 100 85-115 0.2 10 Iron 1 .0 0.974 0.971 0.972 97 85-115 0.3 10 Lead 0.50 0.499 0.489 0.494 99 85-115 2. 1 10 Lithium 0.20 0.211 0.213 0.212 106 85-115 0.9 10 Magnesium 50 52.8 52.6 52.7 105 85-115 0.4 10 Manganese 0.50 0.483 0.483 0.483 97 85-115 0.1 10 Molybdenum 0.20 0.195 0.193 0.194 97 85-115 0.7 10 Nickel 0.50 0.499 0.490 0.495 99 83-115 1 .9 10 Potassium 50 51 .0 51 .4 51 .2 102 83-115 0.8 10 Selenium 2.0 1 .96 1.99 1 .97 99 85-115 1 .5 10 Silver 0.050 0.0494 0.0488 0.0491 98 56-116 1 .4 35 Sodium 100 104 103 103 103 85-115 0.6 10 Thallium 2.0 2.00 2.03 2.02 101 84-118 1 .6 10 Tin 4.0 3.98 3.93 3.95 99 80-115 1 .4 15 Titanium 2.0 1 .90 1 .90 1 .90 95 85-115 0.2 10 Vanadium 0.50 0.491 0.490 0.491 98 82-115 0.2 20 Zinc 0.50 0.486 0.484 0.485 97 80-115 0.5 20 Calculations are performed before rounding to avoid round-off errors in calculated results.