Construction plan sheets and an accompanying narrative report shall be submitted describing existing and proposed site conditions, including the following:
(A) Project narrative and supporting documents, including the following information:
(1) An index indicating the location in the construction plans of all information required by this section;
(2) Description of the nature and purpose of the project;
(3) Legal description of the project site. The description should be to the nearest quarter section, township, and range, and include the civil township;
(4) Soil properties, characteristics, limitations, and hazards associated with the project site and the measures that will be integrated into the project to overcome or minimize adverse soil conditions;
(5) General construction sequence of how the project site will be built, including phases of construction;
(6) 14-Digit Watershed Hydrologic Unit Code (HUC);
(7) A reduced plat or project site map showing the lot numbers, lot boundaries, and road layout and names. The reduced map must be legible and submitted on a sheet or sheets no larger than 11 inches by 17 inches for all phases or sections of the project site;
(8) A general site plan exhibit with the proposed construction area superimposed on ortho-aerial map at a scale of 1" = 100'. The exhibit should provide two-foot contour information and include all roads and buildings within a minimum 500-foot radius beyond the project boundaries; and
(9) Identification of any other state or federal water quality permits that are required for construction activities associated with the owner's project site;
(B) Vicinity map depicting the project site location in relationship to recognizable local landmarks, towns, and major roads, such as a USGS topographic;
(C) An existing project site layout that must include the following information:
(1) Location, name and normal water level of all wetlands, lakes, ponds and water courses on, or adjacent to, the project site;
(2) Location of all existing structures on the project site;
(3) One hundred year floodplains, floodway fringes, and floodways. Please note if none exists;
(4) Soil map of the predominant soil types, as determined by the United States Department of Agriculture (USDA), Natural Resources Conservation Service (NRCS) Soil Survey or as determined by a soil scientist. A soil legend must be included with the soil map;
(5) Identification and delineation of vegetative cover, such as grass, weeds, brush, and trees, on the project site;
(6) Location of storm, sanitary, combined sewer and septic tank systems and outfalls;
(7) Location of regulated drains, farm drains, inlets and outfalls, if any exist of record;
(8) Land use of all adjacent properties; and
(9) Existing topography at a contour interval appropriate to indicate drainage patterns;
(D) Final project site layout, including the following information:
(1) Location of all proposed site improvements, including roads, utilities, lot delineation and identification, proposed structures and common areas;
(2) One hundred year floodplains, floodway fringes, and floodways. Please note if none exists; and
(3) Proposed final topography at a contour interval appropriate to indicate drainage patterns;
(E) A grading plan, including the following information:
(1) The grading plan shall include provisions for operation and maintenance of measures identified in the perimeter control plan;
(2) The grading plan shall make clear the erosion prevention and sediment controls which are most appropriate to the specific site conditions;
(3) The grading plan shall illustrate the location and extent of erosion prevention and sediment controls;
(4) The grading plan shall include sequencing and schedule information, structural and non-structural best management practices (BMPs), temporary and permanent stabilization measures;
(5) The grading plan shall include anticipated inspection and maintenance requirements for permanent and temporary measures. This shall include the expected frequency of routine inspections and maintenance activities (such as removal of sediment and construction debris);
(6) The grading plan shall include provisions for construction phasing. This shall be designed so that stripping and clearing of the site exposes only the area necessary for immediate activities and minimizes the amount of soil exposed at any one time. This includes rough grading, construction of utilities, infrastructure and buildings, and final grading and landscaping. Phasing should identify the expected date on which clearing of the area will begin and the estimated duration of exposure. The sequence of phased clearing and the installation of temporary and permanent erosion control measures should be identified;
(7) The grading plan shall include provisions for a no-disturbance waterway buffer, including:
(a) The no-disturbance waterway buffer shall be defined as 25 feet from the top of waterway bank as defined by geomorphic shape and not by the current water surface elevation;
(b) The no-disturbance waterway buffer shall be applied to all waterways and open-air drainage systems that drain more 100 acres of tributary area or is presented on a United State Geological Survey map as a solid and dashed blue line stream;
(8) The grading plan shall include provisions for stabilizing denuded areas and soil stockpiles:
(a) Soil stabilization shall be designed to prevent the erosive forces of rain and water flow from washing soil from the site. Soil stabilization measures may be temporary and/or permanent and should be appropriate to the seasonal hydrology, site conditions, and estimated duration the measure will be in place;
(b) Denuded areas must be stabilized with permanent or temporary soil stabilization measures within 15 days of either achieving final grade, or within 15 days to any area that will remain dormant for over 60 days; and
(c) Soil stockpiles, if left undisturbed for 15 or more days, shall be stabilized. Sediment trapping measures such as sediment traps and detention ponds shall be utilized to prevent soil loss from the project site through the duration of soil stockpiling practices;
(9) The grading plan shall include provisions for stabilizing cut and fill slopes:
(a) Minimization of erosion must be considered when designing and constructing cut and fill slopes. Length, steepness, soil type, upslope tributary area, groundwater, and other relevant factors must all be taken into account;
(b) Stabilization practices such as rock riprap, geosynthetic material, or other methods approved by the town shall be used on cut and fill slopes at 3 to 1 or greater; and
(c) Cut and fill slopes must be stabilized with permanent or temporary soil stabilization measures within 15 days of either achieving final grade, or within 15 days to any area that will remain dormant for over 60 days;
(10) The grading plan shall include provisions for erosion prevention measures. Erosion prevention measures shall be designed to minimize the suspension of sediment from the soil. The controls may function independently or in combination with sediment control measures, to prevent sediment laden runoff from leaving the construction site. Acceptable erosion prevention practices include:
(a) Phased construction/clearing;
(b) Dust control;
(c) Construction road stabilization;
(d) Temporary seeding;
(e) Top soiling;
(f) Mulching;
(g) Nets and mats;
(h) Geotextiles;
(i) Terracing;
(j) Soil bioengineering - slope and stream stabilization;
(k) Rip-rap;
(l) Channel linings;
(m) Temporary diversions, drains and swales;
(n) Stream crossings;
(o) Water bar; or
(p) Other measures reviewed and accepted by the town are also appropriate erosion prevention practices;
(11) The grading plan shall include provisions for sediment control measures. Sediment control measures shall be designed to remove sediment, by settling, flocculating, filtering or other means, from storm runoff prior to discharge from the construction site. The controls may function independently or in combination with erosion prevention measures, to prevent sediment laden runoff from leaving the construction site. Acceptable sediment control practices in include:
(a) Stabilized construction entrance;
(b) Construction entrance tire washing;
(c) Buffer zones;
(d) Check dams;
(e) Silt fence;
(f) Double layered straw bale barrier;
(g) Sand bag barrier;
(h) Brush, rock filter and continuous berms;
(i) Sediment traps;
(j) Temporary sediment/detention basin;
(k) Temporary inlet protection;
(l) Temporary outlet protection;
(m) Infiltration systems;
(n) Wet detention ponds;
(o) Dry detention ponds;
(p) Constructed wetlands;
(q) Biofilter swales;
(r) Water quality inlets and hydrodynamic separators; or
(s) Other measures reviewed and accepted by the town are also appropriate sediment control practices;
(F) A drainage plan, including the following information:
(1) An estimate of the peak discharge, based on the ten year storm event, of the project site for both preconstruction and post-construction conditions;
(2) Calculation showing that the peak runoff rate post-development for the ten-year and 100-year return period storms of critical duration will not exceed the two-year and ten-year return period pre-development peak runoff rates, respectively;
(3) Location, size, and dimensions of all stormwater drainage systems, such as culverts, storm sewers, and conveyance channels;
(4) Locations where stormwater may be directly discharged into ground water, such as abandoned wells or sinkholes. Please note if none exists;
(5) Locations of specific points where stormwater discharge will leave the project site;
(6) Name of all receiving waters. If the discharge is to a separate municipal storm sewer, identify the name of the municipal operator and the ultimate receiving water;
(7) Location, size, and dimensions of features, such as permanent retention or detention facilities, including existing or manmade wetlands, used for the purpose of stormwater management. Include existing retention or detention facilities that will be maintained, enlarged or otherwise altered and new ponds or basins to be built and the basis of their design;
(8) The estimated depth and amount of storage required by the design of the new pond(s) or basin(s);
(G) A stormwater pollution prevention plan (SWPPP) for construction activities must be designed to, at a minimum, meet the requirements of this chapter, and must include the following:
(1) Location, dimensions, detailed specifications, and construction details of all temporary and permanent stormwater quality measures;
(2) Temporary stabilization plans and sequence of implementation;
(3) Permanent stabilization plans and sequence of implementation;
(4) Temporary and permanent stabilization plans shall include the following:
(a) Specifications and application rates for soil amendments and seed mixtures; and
(b) The type and application rate for anchored mulch;
(5) Construction sequence describing the relationship between implementation of stormwater quality measures and stages of construction activities;
(6) Anticipated inspection and maintenance requirements for permanent and temporary measures. This shall include the expected frequency of routine inspections and maintenance activities (such as removal of waste concrete);
(7) A description of potential pollutant sources associated with the construction activities that may reasonably be expected to add a significant amount of pollutants to stormwater discharges, including:
(a) Waste concrete management;
(b) Material delivery, handling and storage;
(c) Sanitary/septic waste management;
(d) Solid waste/trash and debris management;
(e) Spill prevention control and countermeasures;
(f) Vehicle and equipment cleaning, fueling and maintenance; and
(g) Sensitive and vegetated area preservation;
(8) Material delivery, handling and storage associated with construction activities shall meet the spill prevention and spill response requirements of 327 IAC 2-6.1;
(9) The SWPPP must include provisions for addressing the following issues as applicable to the site-specific construction activities:
(a) Dewatering operations;
(b) Contaminated soil management;
(c) Hazardous materials and waste management;
(d) Pesticides, herbicides and fertilizer use;
(e) Collection system maintenance;
(f) Drainage system flushing;
(g) Over-water activities;
(h) A typical erosion and sediment control plan for individual lots; and
(i) Self-monitoring program including plan and procedures;
(H) The Indiana Department of Natural Resource's guidance documents, including the Handbook for Erosion Control in Developing Areas, 1985 or the Indiana Stormwater Quality Manual, should be reviewed and considered when preparing the grading plan and stormwater pollution prevention plan; and
(I) The town reserves the right to develop or adopt other guidance documents to serve as design and implementation standards. Other guidance documents distributed by Clark County, Indiana, the Town of Sellersburg or the City of Jeffersonville may need to be reviewed and considered when preparing the perimeter control plan. These documents may be applied by the town as standards by which designs are to be prepared and controls implemented.
(Ord. 2004-SW-02, passed 11-9-04)