Document: NRC Regulatory Guide
Document ID: f0baf50b-5bb7-4783-b2f9-9586e09c97e1
Document Type: regulatory_guide
Title: Preparation of Environmental Reports for Nuclear Power Stations + HISTORY - HISTORY 02/2017 – DG-4026 , Proposed Revision 3 09/2014 – Periodic Review of Revision 2 – Revise (Rev. 3)
Source: NRC Regulatory Guide Division 4
Source URL: https://www.nrc.gov/docs/ML1611/ML16116A068.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-4.2
CFR Part: 
CFR Title: 

Content:
th the applicable Federal, State, regional, local, and affected American Indian Tribal standards and regulations. Activities resulting in hydrological alterations that could affect water use and water quality may include, but are not limited to, the building of cofferdams and stormwater management and drainage systems, dredging operations, placement of fill material in the water, and the creation of shoreside facilities. Other examples include building of intake and discharge structures for cooling water or other purposes, straightening or deepening of a water channel, building in a floodplain, clearing and grading, excavation, and groundwater dewatering of excavations. The ER should include a description of the following: • modification of site drainage pattern; • change in floodplain capacity, and expected changes in water levels and groundwater heads; • effects of alterations on the quantity and availability of water within the ROI; • effects of alterations to river discharge, including changes in the seasonal variation of flow, or groundwater discharge to wetlands; • effects of effluent discharge on the water quality of the receiving waterbodies, including the effects of erosion and sediment transport; • proposed actions to minimize the effects of the hydrologic alterations; and • identification of applicable standards and regulations. When a mathematical model is used to evaluate the effects of hydrologic alterations, the applicant should describe the conceptual basis for the model, including the rationale for eliminating plausible alternative conceptualizations, the assumptions used in developing the model, the range of applicability of the model, input data used, the basis for boundary conditions, parameter estimation and calibration procedures followed, and estimates of uncertainty in model forecasts. The applicant should provide sufficient data to permit staff evaluation of modeling results, including input files used to obtain the model