National Water-Quality Assessment (NAWQA) Project
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Number Mean Std Dev Minimum Maximum Atrazine 101 0.298 0.399 0.050 2.100 DEA 106 0.211 0.334 0.050 2.300 DIA 32 0.218 0.230 0.050 1.170
Variable Mean Std. Dev. Percent of urban residential within 3.2 km (URBAN) 8.661 12.822 Depth to top of aquifer (DEPTH) (m) 5.488 5.089 Median of well open interval (OPEN) (m) 26.956 25.086 Percent of pasture within 3.2 km (PASTURE) 8.417 13.045 Percent of forest within 3.2 km (FOREST) 10.265 10.913 Dummy variables (yes = 1; no = 0) Irrigation within 3.2 km (IRRID) 0.301 Chemical facility within 3.2 km (CHEM) 0.147 Golf course within 3.2 km (GOLF) 0.130 Primary water use is domestic (USEHD) 0.501 Primary water use is public supply (USEPD) 0.301 Well is unused (USEUD) 0.112 Aquifer class is unconsolidated (CLASSD) 0.653 Aquifer type is unconfined (TYPED) 0.676 Feedlot within 30 m (FEED1D) 0.073 Feedlot within 30 m-0.4 km (FEED2D) 0.227 Feedlot within 0.4-3.2 km (FEED3D) 0.316 Stream within 30 m (STR1D) 0.077 Stream within 30 m-0.4 km (STR2D) 0.397 Stream within 0.4-3.2 km (STR3D) 0.569 Sample in July or August (SUMMER) 0.499 Sample size 589
Parameter Standard Chi2 Test Variable Estimate Error Chi2 Va Pr >Chi INTERCPT -5.308 0.520 104.048 0.000 USED1 0.000 USEHD -0.776 0.438 3.141 0.076 USEPD 0.692 0.436 2.513 0.113 USEUD - 1.079 0.571 3.578 0.059 STR1D 1.009 0.420 5.770 0.016 TYPED 0.779 0.286 7.436 0.006 FOREST -0.036 0.014 6.321 0.012 STR2D 0.540 0.273 3.914 0.048 URBAN - 0.021 0.011 3.802 0.051 SUMMER 0.447 0.248 3.247 0.072 SCALE 1.979 0.163
Parameter Standard Chi2 Test Variable Estimate Error Chi2 Va Pr >Chi INTERCPT -4.842 0.530 83.385 0.000 FOREST -0.046 0.012 14.486 0.000 TYPED 0.831 0.244 11.598 0.000 USED1 0.035 USEHD 0.138 0.399 0.119 0.730 USEPD 0.795 0.398 3.995 0.046 USEUD 0.436 0.462 0.893 0.345 STR1D 0.753 0.327 5.310 0.021 SUMMER 0.399 0.198 4.056 0.044 STR3D 0.435 0.208 4.366 0.037 CLASSD -0.726 0.287 6.403 0.011 OPEN -0.003 0.002 3.682 0.055 SCALE 1.623 0.131
Parameter Standard Chi2 Test Variable Estimate Error Chi2 Pr >Chi INTERCPT -5.539 1.236 20.072 0.000 USED1 0.027 USEHD -0.062 0.869 0.005 0.943 USEPD 1.707 0.848 4.054 0.044 USEUD 1.421 0.900 2.491 0.115 STR1D 2.094 0.585 12.831 0.000 OPEN -0.027 0.009 8.549 0.004 FOREST -0.085 0.032 7.243 0.007 CLASSD -2.328 0.807 8.329 0.004 TYPED 1.339 0.565 5.622 0.018 STR3D 0.989 0.454 4.741 0.030 SUMMER 0.798 0.408 3.823 0.051 SCALE 1.972 0.300
Compound Sample Size Mean1 Std Dev1 Minimum1 Maximum1 Atrazine Residue 589 0.119 0.358 1.388 x 10-3 4.480 Atrazine 589 0.057 0.198 7.048 x 10-5 2.100 DEA 589 0.046 0.161 1.274 x 10-4 2.300 DIA 589 0.016 0.072 9.576 x 10-9 1.170
Paramenter Estimate Significant At1 ------------------------------------------------ Variable Sign *: at 0.05 **: at 0.10 INTERCEP OPEN - * URBAN - FOREST - * CLASSD - ** TYPED + * STR1D + * STR3D + * SUMMER + ** IRRID + * USEPD + *