TSD for U.S. EPA’s Proposed Numeric Nutrient Criteria for FL Inland Surface Fresh Waters



# Appendix B-5: Alternative Calc ulations for EPA’s Proposed Nutrient Watershed Region Distribution ApproachTSD for U.S. EPA’s Proposed Numeric Nutrient Criteria for FL Inland Surface Fresh Waters



### B5-1 

## Appendix B-5. Alternative Calculations for EPA’s Proposed Nutrient Watershed Region Distribution Approach

Table B5-1. Summary of All Potential Nutrie nt Criteria Endpoints by Nutrient Watershed Region and Nutrient Parameter: Analysis by Si te Average Water Chemistry. The 75th and 90th Percentile Values are in mg/L. The Mean and Standard Deviations ar e in Natural Logarithm Units. REGION BONE VALLEY PANHANDLE PENINSULA NORTH CENTRAL SCI=40 TN TP TN TP TN TP TN TP Mean 0.309 -0.752 -0.724 -3. 881 -0.24 -2.879 -0.096 1.847 Stdev 0.412 0.667 0.788 1. 081 0.633 0.957 0.722 1.22 75 th 1.798 0.739 0.824 0.043 1.205 0.107 1.479 0.359 90 th 2.309 1.109 1.33 0.082 1.769 0.192 2.291 0.753 N 22 22 128 131 82 83 17 17

SCI=44 TN TP TN TP TN TP TN TP Mean 0.269 -0.725 -0.759 -3.904 -0.251 -2.864 0.084 1.535 Stdev 0.444 0.7 0.787 1. 111 0.651 0.986 0.539 0.987 75 th 1.765 0.777 0.796 0.043 1.207 0.111 1.564 0.419 90 th 2.31 1.188 1.283 0.084 1.792 0.202 2.17 0.763 N 16 16 118 121 76 77 14 14

SCI=50 TN TP TN TP TN TP TN TP Mean 0.261 -0.576 -0.838 -3.965 -0.325 -2.936 0.064 1.405 Stdev 0.312 0.721 0.796 1. 135 0.655 1.02 0.556 0.891 75 th 1.603 0.914 0.74 0.041 1.124 0.106 1.552 0.448 90 th 1.937 1.415 1.2 0.081 1.674 0.196 2.175 0.769 N 12 12 94 97 62 63 13 13

SCI=64 TN TP TN TP TN TP TN TP Mean 0.159 -0.999 -1.045 -4. 296 -0.301 -3.129 -0.196 1.721 Stdev 0.459 0.619 0.911 1. 093 0.685 0.988 0.53 0.871 75 th 1.598 0.559 0.65 0.028 1.175 0.085 1.176 0.322 90 th 2.111 0.814 1.13 0.055 1.781 0.155 1.622 0.546 N 4 4 43 45 31 32 8 8 Note: Highlighted in gray are the proposed in-stream prot ective values (IPVs) calculated by Site Average Water Chemistry, Stream Condi tion Index (SCI) > 40, 75 th percentile values. These calculations are based on station total nitrogen (TN) and total phosphorus (TP) average water chem istry values estimated from the updated All Sites data set. Multiple samples from a site were natural log trans formed and geometric means were calculated. These values are, therefore, based on one value per site. This excludes all sites with any consecutive SCI values less than 40, 44, 50, or 64 for multiple SCI sample sites or SCI less than 40, 44, 50, or 64 for single sample sites. It also excludes all sites from any waterbody ID (WBID) with a known nutrient and/or dissolved oxygen (DO) impairment listing. Means and standard deviations were estimated fr om site means and back transformed to theoretical 75 th and 90 th percentiles.TSD for U.S. EPA’s Proposed Numeric Nutrient Criteria for FL Inland Surface Fresh Waters



### B5-2 Table B5-2. Summary of All Potential Nutrie nt Criteria Endpoints by Nutrient Watershed Region and Nutrient Parameter: Analysis by Gr ab Sample Water Chemistry. The 75th and 90th Percentile Values are in mg/L. The Mean and Standard Deviations ar e in Natural Logarithm Units. REGION BONE VALLEY PANHANDLE PENINSULA NORTH CENTRAL SCI=40 TN TP TN TP TN TP TN TP Mean 0.236 -0.882 -0.665 -3. 88 -0.235 -2.925 0.276 1.597 Stdev 0.531 0.895 0.764 1. 014 0.693 0.875 0.526 1.12 75 th 1.811 0.757 0.861 0.041 1.261 0.097 1.879 0.431 90 th 2.5 1.303 1.369 0.076 1.921 0.165 2.587 0.85 N 57 57 338 338 273 273 32 32

SCI=44 TN TP TN TP TN TP TN TP Mean 0.189 -0.92 -0.675 -3. 899 -0.241 -2.892 0.2 1.622 Stdev 0.551 0.917 0.776 1. 049 0.727 0.899 0.5 1.193 75 th 1.752 0.74 0.859 0.041 1.283 0.102 1.711 0.441 90 th 2.447 1.291 1.376 0.078 1.995 0.176 2.318 0.911 N 47 47 312 312 241 241 28 28

SCI=50 TN TP TN TP TN TP TN TP Mean 0.225 -0.94 -0.759 -3. 95 -0.353 -2.938 0.262 1.176 Stdev 0.546 0.947 0.765 1. 067 0.727 0.932 0.45 0.902 75 th 1.811 0.74 0.784 0.04 1.147 0.099 1.761 0.567 90 th 2.523 1.314 1.247 0.076 1.784 0.175 2.314 0.981 N 37 37 252 252 185 185 22 22

SCI=64 TN TP TN TP TN TP TN TP Mean -0.074 -0.998 -0.917 -4 .274 -0.335 -2.738 0.166 1.399 Stdev 0.616 0.759 0.696 0. 892 0.704 0.869 0.475 0.793 75 th 1.407 0.615 0.639 0.025 1.15 0.116 1.626 0.421 90 th 2.045 0.975 0.976 0.044 1.764 0.197 2.169 0.682 N 13 13 123 123 72 72 16 16 Note: These calculations are based on grab TN and TP water chemistry values associated with SCI samples. This, therefore, includes multiple samples fo r some sites. It excludes all sites with any consecutive SCI values less than 40, 44, 50, or 64 for multiple SCI samp le sites or SCI less than 40, 44, 50, or 64 for single sample sites. It also excludes all sites from any WBID with a known nutri ent and/or DO impairment lis tings. Means and standard deviations are natural logs, which were back transformed to estimate the theoretical 75 th and 90 th percentiles.TSD for U.S. EPA’s Proposed Numeric Nutrient Criteria for FL Inland Surface Fresh Waters



### B5-3 Table B5-3. Summary of All Potential Nutrie nt Criteria Endpoints by Nutrient Watershed Region and Nutrient Parameter: Analysis by Site-YR Average Water Chemistry. The 75th and 90th Percentile Values are in mg/L. The Mean an d Standard Deviations ar e in Natural Logarithm Units. REGION BONE VALLEY PANHANDLE PENINSULA NORTH CENTRAL SCI=40 TN TP TN TP TN TP TN TP Mean 0.315 -0.389 -0.693 -3. 898 -0.115 -2.939 0.049 1.784 Stdev 0.351 0.827 0.662 0. 895 0.596 0.891 0.487 0.788 75 th 1.737 1.184 0.782 0.037 1.332 0.097 1.459 0.286 90 th 2.149 1.957 1.168 0.064 1.913 0.166 1.961 0.461 N 35 35 269 273 170 167 60 61

SCI=44 TN TP TN TP TN TP TN TP Mean 0.297 -0.284 -0.73 -3. 952 -0.112 -2.923 0.075 1.687 Stdev 0.336 0.833 0.679 0. 929 0.608 0.908 0.434 0.746 75 th 1.689 1.32 0.762 0.036 1.348 0.099 1.444 0.306 90 th 2.071 2.188 1.151 0.063 1.95 0.172 1.879 0.482 N 28 28 238 242 161 158 47 48

SCI=50 TN TP TN TP TN TP TN TP Mean 0.294 -0.111 -0.804 -3. 973 -0.183 -3.108 0.063 1.614 Stdev 0.229 0.801 0.708 0. 945 0.593 0.83 0.439 0.67 75 th 1.567 1.537 0.721 0.036 1.242 0.078 1.432 0.313 90 th 1.801 2.498 1.109 0.063 1.781 0.129 1.869 0.47 N 23 23 180 184 124 122 45 46

SCI=64 TN TP TN TP TN TP TN TP Mean 0.159 -0.999 -0.949 -4. 124 -0.148 -3.265 -0.027 1.686 Stdev 0.459 0.619 0.702 0. 879 0.645 0.74 0.396 0.597 75 th 1.598 0.559 0.622 0.029 1.333 0.063 1.272 0.277 90 th 2.111 0.814 0.952 0.05 1.971 0.099 1.617 0.398 N 4 4 93 96 66 66 38 39 Note: These calculations are based on station TN and TP average water chemistry values estimated from the updated All Sites data set. Multiple samples from a site were natural log transformed and geometric means calculated for each year of data. These values are, therefore, based on multiple values for some sites. It excludes all sites with any consecutive SCI values less than 40, 44, 50, or 64 for mu ltiple SCI sample sites or SCI less than 40, 44, 50, or 64 for single sample sites. It also ex cludes all sites from any WBID with a known nutrient and/or DO impairment listings. Means and standard deviations were estimated from site means and back transformed to theoretical 75 th and 90 th percentiles.