This regulation requires that a Storm Water Pollution Prevention Plan (SWP3) be developed and implemented for all disturbing activities disturbing one or more acres of total land, or less than one acre if part of a larger common plan of development or sale disturbing one or more acres of total land. A Storm Water Pollution Prevention Plan (SWP3) must be developed and implemented for all commercial and industrial site development that disturbs more than 0.5 acres of land. The City Engineer may require a Comprehensive Storm Water Management Plan on sites disturbing less than one0 acre.
(a) Development Sites Under One Acre In Size: Individual development sites that are larger than 10,500 square feet and smaller than one acre (43,560 square feet) in total size of disturbed area, can submit an abbreviated SWP3 with the topography plan for the requested permit(s). The abbreviated plan must cover the following items, in addition to any other items from this chapter that are required by the City Engineer.
(1) Storm water issues: A statement as to how the increased storm water runoff that will be caused by the planned development project will be handled. This statement must identify the Best Management Practices (BMPs) the new construction project will include in order to address storm water runoff.
(2) Redevelopment exemption: Owners of development sites that were created by demolishing an older existing structure can request, in writing, that the City Engineer exempt them from the storm water issues if the total soil surface area being made impermeable is the same or less than the total soil surface area that was impermeable due to the structure(s) being torn down and removed.
(3) Riparian and wetland setbacks: All riparian and wetland-setback areas will be identified in the plan and in the field before construction starts.
(4) Soil erosion and sediment issues: A sketch of the entire development site must be submitted that identifies the location of:
A. All existing and planned impervious areas, storm water inlets, drainage swales, wetlands, streams, conservation easements and other natural features to be saved and protected on the property.
B. All existing and planned temporary and permanent conservation practices for the site. Residential lots shall include at a minimum the following:
1. Soil erosion and sediment control BMPs, and;
2. Construction entrance, and;
3. Temporary grass seeding with two tons per acre of straw mulch, and;
4. Storm drain inlet protection around every storm yard inlet on the site or accepting drainage from the site, and;
5. Silt fence protection for any stream located on or close to the site and lacking an adequate vegetative buffer, and;
6. Silt fence to prevent sediment discharge into street storm sewer inlets where no centralized sediment control exists for the drainage area that includes the lot, and;
7. Construction fence to protect any conservation easements, riparian setbacks and wetland setbacks from encroachment by construction activities.
(5) The schedule for the use of temporary seeding developed according to the temporary seeding table contained in the minimum standards section of this chapter must be included. The location of construction material stockpile areas, if such have been approved by the City Engineer, with a description of the soil erosion and sediment controls to be maintained on the stockpile area prior to, during, and after the area is used for stockpiling.
(b) Development Sites One Acre In Size or Larger: All developments that have a larger common plan of development or sale equal to or larger than one acre in size of disturbed area are subject to this chapter and shall follow all of the requirements set forth in this chapter.
(1) Description of the plan of construction: The following information shall be included in the Storm Water Pollution Prevention Plan:
A. Site description:
1. A description of the prior land uses of the site.
2. A description of the nature and type of construction activity (e.g., low density residential, shopping mall, highway, etc.).
3. A description of the total area of the site and the area of the site that is expected to be disturbed (i.e., grubbing, clearing, excavating, filling or grading, including offsite borrow, fill or spoil areas and off-site utility installation areas).
4. An estimate of the impervious area and percent imperviousness created by the land disturbance activity.
5. A calculation of the run-off coefficients for both the pre-construction and post construction site conditions.
6. The types of soils within, or affected by, the development area, and the location of all highly erodible or unstable soils as determined by the most current edition of the soil survey of the county, by the Natural Resources Conservation Service (NRCS).
7. An onsite, detailed soils engineering report if required by the City Engineer.
8. The name and/or location of the immediate receiving stream or surface water(s) and the first subsequent named receiving water and the aerial extent and description of wetlands or other special aquatic sites at or near the site which will be disturbed or which will receive discharges from disturbed areas of the project. For discharges to a municipal separate storm sewer system (MS4), the point of discharge to the MS4 and the location where the MS4 ultimately discharges to a water resource shall be indicated.
9. List TMDLs applicable for the site and demonstrate that appropriate BMPs or storm water control measures (SCMs) have been selected to address these TMDLs. [A TMDL identifier table for Northeast Ohio communities is available at http://www.neohiostormwater.com/]
10. A log documenting grading and stabilization activities as well as amendments to the SWP3, which occur after construction activities commence.
11. Each temporary and permanent storm water practice shall be designated with an individual identification number.
B. A vicinity sketch locating:
1. The larger common plan of development or sale.
2. The development area.
3. All pertinent surrounding natural features within 200 feet of the development site including, but not limited to:
a. Water resources such as wetlands, springs, lakes, ponds, rivers and streams (including intermittent streams with a defined bed and bank).
b. Conservation easements.
c. Other sensitive natural resources.
d. The sensitive areas receiving runoff from the development.
4. All off-site borrow or spoil areas.
5. All off-site utility installation areas that are related to the planned project.
C. The existing and proposed topography shown in the appropriate contour intervals as approved by the City Engineer (generally one-foot contours are used).
D. The location and description of existing and proposed drainage patterns and facilities, including any allied drainage facilities beyond the development area and the larger common plan of development or sale.
E. Existing and proposed watershed boundary lines, direction of flow and watershed acreage.
F. The person or entity responsible for continued maintenance of all vegetative and/or mechanical BMPs for both the construction and post-construction phases of the development.
G. Long-term maintenance requirements and schedules of all BMPs for both the construction and post-construction phases of the development.
H. Long-term maintenance inspection schedules.
I. The person or entity financially responsible for conducting the inspections of, and the maintenance of, permanent storm water conveyance and storage structures and all other conservation practices.
J. The method of ensuring that funding will be available to conduct the long-term maintenance and inspections of all permanent storm water, soil erosion and sediment control and water quality practices.
K. The location of any existing or planned riparian and/or wetland setback areas on the property.
L. The plan must clearly describe, for each major construction activity, the appropriate BMT's and the general timing (or sequence) during the construction process of when the measures will be implemented; and, who (which contractor) will be responsible for implementation (e.g., Contractor A will clear, grub and install perimeter controls and Contractor B will maintain perimeter controls until final stabilization; Contractor C will conduct and document the scheduled inspections.)
M. Location and description of any storm water discharges associated with dedicated asphalt and concrete plants covered by this regulation and the Best Management Practices to address pollutants in these storm water discharges.
N. Sediment and storm water management basins including their sediment settling volume and the maximum expected disturbed area that will be directed to the sediment pond during construction. The plan should include a summary of the following:
1. The required sediment storage and dewatering volumes.
2. The provided sediment storage and dewatering volumes.
3. The weir length or skimmer size, as applicable.
4. The weir length or skimmer size provided.
O. Data sheets for all sediment traps, sediment basins, and SCMs that identify contributing drainage area, disturbed area, water quality volume, sedimentation volume, dewatering volume, practice surface area, facility discharge and dewatering time, outlet type and dimensions, and any other relevant parameters for each practice.
P. A separate plan and profile view of each individual sediment settling pond and its outlet structure. Detail drawings of the outlet structure shall indicate the following elevations:
1. Pond bottom.
2. Elevation required to store the required sediment storage volume.
3. For sediment basins, the elevation at which the skimmer is attached.
4. For sediment traps, the top and bottom of the stone outlet section.
5. Elevation required to store the dewatering volume, exclusive of the sediment storage volume.
6. Elevation of the top of embankment.
7. Crest of the emergency spillway.
Q. Where used as a sediment-settling pond during construction, the plan shall include a detail drawing of the temporary outlet configuration of the permanent storm water basin with the following information specified:
1. Storage volume provided below the elevation at which the skimmer or other surface dewatering device is attached.
2. Elevation at which the skimmer or other surface dewatering device is attached.
3. Elevation at which the full dewatering zone is stored above the skimmer invert.
4. Any temporary modification to permanent outlet orifices or weirs required to ensure no discharge below the skimmer invert and only the skimmer controls the discharge up to the top of the dewatering volume.
5. Calculations of the sediment storage volume, dewatering volume and skimmer drawdown time shall also be provided.
R. The location of permanent SCMs to be used to control pollutants in storm water after construction operations have been completed.
S. Methods to minimize the exposure of building materials, building products, construction wastes, trash, landscape materials, fertilizers, pesticides, herbicides, detergents, and sanitary waste to precipitation, storm water runoff, and snow melt.
T. Measures to prevent and respond to chemical spills and leaks. Applicants may also reference the existence of other plans (i.e., Spill Prevention Control and Countermeasure (SPCC) Plans, spill control programs, Safety Response Plans, etc.) provided that such plan addresses this requirement and a copy of such plan is maintained on site.
U. Methods to minimize the discharge of pollutants from equipment and vehicle washing, wheel wash water, and other wash waters. No detergents may be used to wash vehicles. Wash waters shall be treated in a sediment basin or alternative control that provides equivalent treatment prior to discharge.
(2) Storm Water Pollution Prevention Plan: the Storm Water Pollution Prevention Plan shall include, at a minimum, the following information:
A. The Storm Water Pollution Prevention Plan shall include a map showing the location of:
1. The limits of earth disturbing activity including excavations, filling, grading or clearing.
2. Drainage patterns during major phases of construction.
3. The location of each proposed soil erosion and sediment control BMP, including:
a. Permanent soil erosion control practices to be left in place after construction operations have been completed (e.g. level spreaders, permanent erosion control matting, gabions, rock lined channels, etc.),
b. Areas likely to require temporary stabilization during the course of site development,
c. Designated construction entrances where vehicles will access the construction site,
d. In-stream activities including stream crossings,
e. Areas designated for the storage or disposal of solid, sanitary and toxic wastes,
f. Dumpsters,
g. Cement truck washout,
h. Fuel tanks,
i. BMPs that divert runoff away from disturbed areas and steep slopes where practicable including rock check dams, pipe slope drains, diversions to direct flow away from exposed soils, and protective grading practices,
j. Sediment settling ponds drawn to scale.
4. Existing and proposed locations of buildings, roads, parking facilities and utilities.
5. Boundaries of wetlands and stream channels the owner intends to fill or relocate for which the owner is seeking approval from the U.S. Army Corps of Engineers and/or Ohio EPA.
B. The Storm Water Pollution Prevention Plan shall include a list of soil erosion and sediment control BMPs being used and the standards and specifications, including detailed drawings, for each BMPs. This list shall include:
1. Methods of controlling the flow of runoff from disturbed areas so as to prevent or minimize erosion.
2. Identification of the structural practices to be used to control erosion and trap sediment from a site remaining disturbed for more than 14 days. A description shall be included of how each selected control will store runoff so as to let sediments settle out and/or divert flows away from exposed soils or act to limit runoff from exposed areas.
3. Identification for each structural practice of its size, detail drawings, maintenance requirements and design calculations.
4. The type and amount of plant seed, live plants, fertilizer, agricultural ground limestone and mulch to be used. Specification of soil testing requirements for fertility and lime requirements will be included. Specification for the use of perennial grass seed will also be included.
5. Settling ponds will be identified with basic dimensions and the calculations for size and volume.
6. Detailed drawings and installation requirements of all other structural control BMPs.
7. Any other soil erosion and sediment control related BMP's and items that are required by the City Engineer.
8. For developments where the overall plan does not call for centralized sediment control capable of controlling multiple individual lots, a detail drawing of a project specific typical individual lot showing standard individual lot soil erosion and sediment control practices and the sequence and timing of BMP installation for the individual lots. This does not remove or eliminate the responsibility to designate and install specific soil erosion and sediment control practices for the storm water discharges.
C. The Storm Water Pollution Prevention Plan shall include the scheduling, phasing, and coordination of construction operations and erosion and sediment control BMP's, including vegetative plantings and mulch.
(3) The Storm Water Pollution Prevention Plan shall include a description of the Storm Water Management (SWM) practices to be used on the site. The SWM element of the Plan shall include, at a minimum, the following:
A. A map showing the location, drawn to scale, of permanent SWM conveyance, detention and retention structures, other SWM control structures and the SWM easements.
B. A general description of the SWM strategy proposed to meet this chapter.
C. Design calculations for all permanent SWM conveyance, detention and retention structures, and other SWM control structures.
D. Any other SWM related items required by the City Engineer.
(Ord. 10090- 2017. Passed 6-20-17.)