In order to control stormwater damage and sediment pollution of water resources, wetlands, riparian areas, other natural areas, and public and private lands, the owner of each development area shall be responsible for developing a comprehensive stormwater management plan. This plan will address stormwater management (volume and peak rate of runoff), soil erosion, sediment and other waste control. This plan must contain a description of controls appropriate for each construction operation covered by these regulations, and the operator must implement the planned controls in a timely manner. The plans and BMPs used to satisfy the conditions of these regulations shall meet the standards and specifications in the most current edition of the Indiana Stormwater Quality Manual (formerly known as the Indiana Handbook for Erosion Control in Developing Areas). The plans must make use of the practices that preserve the existing natural condition to the maximum extent practicable. The city can require additional or alternative planning and stormwater management if deemed necessary to further protect water quality, adjacent property owners, or the city's sewer system.
(A) Larger common plan of development or sale equal to or larger than one acre in size of disturbed area. All developments that fit into this category are subject to this chapter and shall follow all of the requirements set forth in this chapter. For project sites that do not meet the criteria in division (B), the project site owner shall develop a set of comprehensive stormwater management plans. Stormwater quality measures included in the plan must achieve the minimum project site requirements specified in this rule. A comprehensive stormwater management plan must include the following:
(1) Construction plan. The construction plan must include 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 division;
2. Description of the prior land uses of the site;
3. Description of the nature and purpose of the project;
4. Legal description of the project site. The description should be to the nearest quarter section, township, and range, and include the civil township;
5. 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;
6. General construction sequence of how the project site will be built, including phases of construction;
7. Hydrologic Unit Code (14 Digit) available from the United States Geological Survey (USGS);
8. 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 24 inches by 36 inches for all phases or sections of the project site; 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 quadrangle map or county or municipal road map.
(c) An existing project site layout that must include the following information:
1. Location and name of all wetlands, lakes, 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. 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 an equivalent publication, 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. Land use of all adjacent properties; and
7. Existing topography at a contour interval (two foot interval maximum to one foot interval may be necessary) 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. Note if none exists; and
3. Proposed final topography at a contour interval (two foot interval maximum to one foot interval may be necessary) appropriate to indicate drainage patterns.
(2) Grading plan. A grading plan, including the following information:
(a) Delineation of all proposed land disturbing activities, including off-site activities that will provide services to the project site;
(b) Location of all soil stockpiles and borrow areas;
(c) Information regarding any off-site borrow, stockpile, or disposal areas that are associated with a project site and under the control of the project site owner; and
(d) Existing and proposed topographic information.
(3) Drainage plan. A drainage plan, including the following information:
(a) An estimate of the peak discharge, based on the ten year storm event, of the project site for both preconstruction and post-construction conditions. Note that additional calculations are necessary for runoff control;
(b) Location, size, and dimensions of all stormwater drainage systems, such as culverts, storm sewers, and conveyance channels;
(c) Locations where stormwater may be directly discharged into groundwater, such as abandoned wells or sinkholes. Note if none exists;
(d) Locations of specific points where stormwater discharge will leave the project site;
(e) 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; and
(f) 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.
(4) Stormwater pollution prevention plan. A stormwater pollution prevention plan associated with construction activities. The plan must be designed to, at least, meet the requirements of this rule and must include the following:
(a) Location, dimensions, detailed specifications, and construction details of all temporary and permanent stormwater quality measures;
(b) Temporary stabilization plans and sequence of implementation;
(c) Permanent stabilization plans and sequence of implementation;
(d) Temporary and permanent stabilization plans shall include the following:
1. Specifications and application rates for soil amendments and seed mixtures; and
2. The type and application rate for anchored mulch;
(e) Construction sequence describing the relationship between implementation of stormwater quality measures and stages of construction activities;
(f) Self-monitoring program including plan and procedures;
(g) 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; and
(h) Material handling and storage associated with construction activity shall meet the spill prevention and spill response requirements in 327 IAC 2-6.1.
(5) Post construction stormwater pollution prevention plan. The post construction stormwater pollution prevention plan. The plan must include the following information:
(a) A description of potential pollutant sources from the proposed land use that may reasonably be expected to add a significant amount of pollutants to stormwater discharges;
(b) Location, dimensions, detailed specifications, and construction details of all post-construction stormwater quality measures;
(c) A description of measures that will be installed to control pollutants in stormwater discharges that will occur after construction activities have been completed. Such practices include infiltration of run-off, flow reduction by use of open vegetated swales and natural depressions, buffer strip and riparian zone preservation, filter strip creation, minimization of land disturbance and surface imperviousness, maximization of open space, and stormwater retention and detention ponds;
(d) A sequence describing when each post-construction stormwater quality measure will be installed;
(e) Stormwater quality measures that will remove or minimize pollutants from stormwater run-off;
(f) Stormwater quality measures that will be implemented to prevent or minimize adverse impacts to stream and riparian habitat; and
(g) A narrative description of the maintenance guidelines for all post-construction stormwater quality measures to facilitate their proper long term function. This narrative description shall be made available to future parties who will assume responsibility for the operation and maintenance of the post-construction stormwater quality measures.
(B) Single-family residential development. For a single-family residential development consisting of four or fewer lots or a single-family residential strip development where the developer offers for sale or lease without land improvements, and the project is not part of a larger common plan of development or sale, the project site owner shall develop a set of comprehensive stormwater management plans containing storm water quality measures that achieve the minimum project site requirements specified in this rule. The comprehensive stormwater management plan must include the following:
(1) Construction plan. The construction plan must include the following:
(a) Project narrative and supporting documents, including the following information:
1. An index indicating the location, in the construction plans, of all required items in this division;
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. Hydrologic unit code (14 Digit) available from the United States Geological Survey (USGS); and
6. Identification of any other state or federal permits that are required for construction activities associated with the project site 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 quadrangle map or county or municipal road map.
(c) A project site layout that must include the following information:
1. Location and name of all wetlands, lakes, and water courses on or adjacent to the project site;
2. Location of all existing structures on the project site (if applicable);
3. One hundred year floodplains, floodway fringes, and floodways. 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 an equivalent publication, 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. Land use of all adjacent properties;
7. Existing and proposed topography at a contour interval (two foot interval maximum to one foot interval may be necessary) to indicate drainage patterns; and
8. Location of all proposed site improvements, including roads, utilities, lot delineation and identification, and proposed structures.
(2) Storm water pollution prevention plan. A stormwater pollution prevention plan associated with construction activities. The plan must be designed to, at least, meet the requirements of this rule and must include the following:
(a) Delineation of all proposed land disturbing activities, including off-site activities that will provide services to the project site;
(b) Location of all soil stockpiles and borrow areas;
(c) Location, size, and dimensions of all stormwater drainage systems, such as culverts, storm sewers, and conveyance channels;
(d) Locations where stormwater may be directly discharged into groundwater, such as abandoned wells or sinkholes. Please note if none exist;
(e) Locations of specific points where stormwater discharge will leave the project site;
(f) 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;
(g) Location, dimensions, detailed specifications, and construction details of all temporary and permanent stormwater quality measures;
(h) Temporary stabilization plans and sequence of implementation of stormwater quality measures;
(i) Temporary and permanent stabilization plans shall include the following:
1. Specifications and application rates for soil amendments and seed mixtures; and
2. The type and application rate for anchored mulch; and
(j) Self-monitoring program plan and procedures.
(C) Application procedures for comprehensive stormwater management plans. A comprehensive stormwater management plan must be submitted according to the following:
(1) Prior to the initiation of any land disturbing activities; and
(2) Sent to the appropriate local county SWCD in addition to the city for review and comment. It is the owner's responsibility to insure that the city receive a copy of any response from the local county SWCD.
(D) Five sets of the comprehensive stormwater management plan and necessary data required by the city, Review Authority and/or this regulation shall be submitted to the city with text material being submitted on 8.5 by 11 inch paper and drawings on no larger than 24 by 36 inch sized paper.
(E) The city shall review the plans, including the review report from the local county SWCD, and shall approve or return these with comments and recommendations for revisions within 30 working days after receipt of the complete plan as described above. A plan rejected because of deficiencies shall receive a report stating specific problems. The plans must be modified to meet the requirements of the rule and resubmitted within 14 days of receipt of the notification of deficient plans. At the time of receipt of a revised plan, another 30 day review period shall begin.
(F) If the project site owner does not receive notification within 30 days after the plan is received by the city stating that the city finds the plan is deficient, the project owner may submit the notice of intent information.
(G) Plans developed by the site owners and approved by the city in accordance with this regulation do not relieve the site owner of responsibility for obtaining and complying with all other necessary permits and/or approvals from federal, state, county, and local agencies and Departments. If requirements vary, the most stringent requirement shall be followed. Plans submitted to the city for review and approval shall be accompanied by all other required permits and documentation relevant to the project, including but not limited to the permits required and issued by the US Army Corps of Engineers, IDEM, INDOT and IDNR.
(H) Approved plans shall remain valid for two years from the date of approval. After two years the plan(s) approval automatically expires. The owner shall resubmit for a new permit in order to recommence construction beyond the two-year period.
(I) No soil disturbing activity shall begin before all necessary local, county, state and federal permits have been granted to the owner or operator.
(J) The city will do periodic construction inspections until the site reaches final stabilization as determined by the city.
(Ord. 3436, passed 9-6-05)