Agenda - 05-23-2005-w2 - Laserfiche WebLink

Browse Search

B. Everett Jardan Reservoir Nutr'ienr A9mraeement Sn-atew and TA1DL- Pu6tic Revien~ Drafi ~ r Total Nitrogen: for the entire lake, Point sources = .32%; Nonpoint Source (NPS) = 68% o Ansong NPS conmibutiazs to the entire Lalce: 36% of NPS from agriculture, 29% from residential, 9% from comm./Indus.., 19% from forest and 7% from other. o Ansong NPS cariributions to the Hat-++ River nrna 46% of NPS is from agriculture, 25% from residential, 7% from comm./Indus., 16% from forest and 6% from other (NPS accouuts for 68% of total loading). o Anaong NPS care ibrrtions to the Upper New Hope Aim a1.Iordan Lake, 10% of the NPS is from agriculture, 39% from residential, 21% from commJh3dus , 19 % from forest, and 1 I% from other (NPS accounts for 55% of total loading). Table 1. *Percentage of N Loading by Source Category and Percent TMDL Loading Reduction Targets for Jordan Lake, Haw River Arm, and New Hope Arm Point Sources Agriculture **Residential Comm/ Indust. Forest Other (NPS NTMDL Taz et Jordan Lake 32 24 20 6 13 5 Haw River 32 31 17 5 Il 4 8 U er New Hoe 45 6 21 12 10 6 35 " Pcrcemagcs for .4g. Rcs .Comm /Indus .Forest, and Oihcr NPS arc based on % of total PT/NPS. c g Ag Loading = 36 % x 68 % (NPS) = 24 io " Includes stormwamr subject to Phase I and Phase II NPDGS permiving requirements - P'or total phosphorus: for the entire lake, Point sources = 16%; NPS = 84%.. o Anaarg NPS corn ibution to Jordan Lake, 51 % from agriculture, 12% from residential, 6% from comm./Indus.., I S% from forest and 16% from other. o Among 1VPS conk-ibutiar 10 the Kaw River, 62% from agriculture, 8% from residential, 4% from comm./Indus., 12% from forest and 14% from other (NPS accounts for 8:3°/u of total loading). o Amoazg NPS cons ibadiorr to the Upper New Hope Airn o~.Ia~dara Lake, 17% fiom agriculture, 29% from residential, 18% from comm./Indus., 19 % from forest, and 17% from other (NPS accounts for 82% of total loading). Table 2. Percentage of P Loading by Source Category and Percent TMDL Loading Reduction Targets for Jordan Lake, Haw River Arm, and New Hope Arm Point Sources Agriculture **Residential Comm/ Indus Forest Other (Nl'S P TMDL Tar et Jordan Lake 16 43 IO 5 13 13 I{aw River t7 51 7 3 10 12 5 U er New Hoe 18 14 24 IS IS 14 5 ' Pcrccnmgcs'forAg, Rcs .Comm /Indus . Porest, and Otbcr NPS arc based on % of total PTMPS '" Includes stormeater subjem m Phase 1 and Phase II NPDES permitting requirements - Alamance, Chatham, Durham, Guilford and Orange counties each contribute 10% or more of total N to.Iordan Lake. For the lake as a whole, the largest contributors of total N are Alamance and Guilford counties, together accounting for 57 percent of the total. For the TMDL. segments, Orange and Durham counties are the major contributors, with approximately equal total loads, A significant portion of the residential N load is due to onsite wastewater disposal. - Alamance, Chatham, Guilford and Orange counties each contribute 9%or more of total P. Df4'Q A9odeling fi Td~IDL Unit V4 page A-lG