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Enseco A Coming Company DUPLICATE CONTROL SAMPLE REPORT Metals Analysis and Preparation Concentration Accuracy Precision Analyte Spiked Measured Avera ge(%) (RPD) DCS1 DCS2 AVG DCS Limits DCS Limit Category: PB-FAA-AT Matrix: AQUEOUS QC Lot: 13 MAY 91-W Concentration Units: mg/L Lead 0.020 0.0240 0.0232 0.0236 118# 82-115 3.4 11 Category: ICP-AT Matrix: AQUEOUS QC Lot: 10 MAY 91-Z Concentration Units: mg/L Aluminum 2.00 1 .88 1.90 1 .89 94 85-115 1 .4 10 Antimony 0.50 0.429 0.427 0.428 86 85-115 0.4 10 Arsenic 0.5 0.455 0.465 0.460 92 85-115 2. 1 10 Barium 2.0 1 .99 2.04 2.01 101 85-115 2.2 10 Beryllium 0.050 0.0451 0.0458 0.0455 91 80-115 1 .4 10 Boron 1 .0 1.04 1 .05 1 .04 104 85-115 0.3 10 Cadmium 0.050 0.0433 0.0477 0.0455 91 81-118 9.7 10 Calcium 100 101 103 102 102 85-115 1 .6 10 Chromium 0.20 0. 185 0. 187 0. 186 93 85-115 1 .2 10 Cobalt 0.50 0.474 0.482 0.478 96 85-115 1 .7 10 Copper 0.25 0.255 0.258 0.257 103 85-115 1 .5 10 Iron 1 .0 0.969 0.989 0.979 98 85-115 2. 1 10 Lead 0.50 0.466 0.470 0.468 94 85-115 0.9 10 Lithium 0.20 0.205 0.213 0.209 105 85-115 3.7 10 Magnesium 50 51 .6 52.4 52.0 104 85-115 1 .5 10 Manganese 0.50 0.471 0.481 0.476 95 85-115 2. 1 10 Molybdenum 0.20 0. 182 0. 184 0. 183 91 85-115 0.6 10 Nickel 0.50 0.480 0.499 0.490 98 83-115 3 .9 10 Potassium 50 50.4 50.9 50.7 101 83-115 1 .0 10 Selenium 2.0 1 .81 1 .83 1 .82 91 85-115 1 .2 10 Silver 0.050 0.0366 0.0362 0.0364 73 56-116 1 .3 35 Sodium 100 102 104 103 103 85-115 1 .4 10 Thallium 2.0 1 .94 1 .93 1 .94 97 84-118 0.8 10 Tin 4.0 3.28 3.28 3.28 82 80-115 0.0 15 Titanium 0.20 0. 194 0. 198 0. 196 98 85-115 1 .9 10 Vanadium 0.50 0.473 0.481 0.477 95 82-115 1 .8 20 Zinc 0.50 0.460 0.465 0.463 93 80-115 1 .0 20 # = Recovery outside QC Limits Calculations are performed before rounding to avoid round-off errors in calculated results.