1005.08 STORMWATER POLLUTION PREVENTION PLAN (SWP3).
(a) In order to control sediment pollution of water resources, the applicant shall submit a SWP3 in accordance with the requirements of this regulation.
(b) The SWP3 shall include Best Management Practices (BMPs) and Stormwater Control Measures (SCMs) adequate to prevent pollution of public waters by soil sediment from accelerated storm water runoff from development areas.
(c) The SWP3 shall be shall be prepared in accordance with sound engineering and/or conservation practices and certified by a professional engineer, a registered surveyor, certified professional erosion and sediment control specialist, or a registered landscape architect experienced in the design and implementation of standard erosion and sediment controls and stormwater management practices addressing all phases of construction.
(d) The SWP3 shall be amended whenever there is a change in design, construction, operation or maintenance, which has a significant effect on the potential for the discharge of pollutants to surface waters of the state or if the SWP3 proves to be ineffective in achieving the general objectives of controlling pollutants in stormwater discharges associated with construction activity.
(e) The SWP3 shall be retained on site during working hours and shall be made available immediately upon request of the Director of Ohio EPA or his/her authorized representative, the City, Engineer, and MS4 operators or their authorized representative during working hours.
(f) The SWP3 shall incorporate measures as recommended by the most current online edition of the Rainwater and Land Development Manual as published by the Ohio Environmental Protection Agency and shall include the following information:
(1) A cover page or title identifying the name and location of the site, the name and contact information of all construction site operators, the name and contact information for the person responsible for authorizing and amending the SWP3, preparation date, and the estimated start and completion dates for construction.
(3) Site description: The SWP3 shall provide:
A. A description of the nature and type of the construction activity (e.g. low density residential, shopping mall, highway, etc.).
B. Total area of the site and the area of the site that is expected to be disturbed (i.e., grubbing, clearing, excavation, filling or grading, including off-site borrow areas).
C. A measure of the impervious area and percent of imperviousness created by the construction activity (existing, new and total impervious area after construction).
D. Stormwater calculations, including the volumetric runoff coefficients for both the pre-construction and post- construction site conditions, and resulting water quality volume; design details for post-construction stormwater facilities and pretreatment practices such as contributing drainage areas, capacities, elevations, outlet details and drain times shall be included in the SWP3; and if applicable, explanation of the use of existing post-construction facilities. Ohio EPA recommends the use of data sheets (see Ohio's Rainwater and Land Development Manual and Ohio EPA resources for examples).
E. Existing data describing the soil and, if available, the quality of any known pollutant discharge from the site such as that which may result from previous contamination caused by prior land uses.
F. A description of prior land uses at the site.
G. A description of the condition of any on-site streams (e.g. prior channelization, bed instability or headcuts, channels on public maintenance, or natural channels).
H. An implementation schedule which describes the sequence of major construction operations (i.e., designation of vegetative preservation areas, grubbing, excavating, grading, utilities and infrastructure installation) and the implementation of erosion, sediment and stormwater management practices or facilities to be employed during each operation of the sequence.
I. The name and/or location of the immediate receiving stream or surface water(s) and the first subsequent receiving water(s) and the areal 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 stream or surface water of the state shall be indicated.
J. List TMDLs applicable for the site and demonstrate that appropriate BMPs or stormwater 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/]
K. For subdivided developments, a detailed drawing of individual parcels with their erosion, sediment or stormwater control practices and/or a typical individual lot showing standard individual lot erosion and sediment control practices. A typical individual lot drawing does not remove the responsibility to designate specific erosion and sediment control practices in the SWP3 for critical areas such as steep slopes, stream banks, drainage ways, and riparian zones.
L. Location and description of any stormwater discharges associated with dedicated asphalt and dedicated concrete plants covered by this permit and the best management practices to address pollutants in these stormwater discharges.
M. A log documenting grading and stabilization activities as well as amendments to the SWP3, which occur after construction activities commence.
N. The SWP3 shall contain a description of the post-construction BMPs that will be installed during construction for the site and the rationale for their selection. The rationale shall address the anticipated impacts on the channel and floodplain morphology, hydrology, and water quality.
O . Each temporary and permanent stormwater practice shall be designated with an individual identification number and date of installation.
P. Site map showing:
1. Limits of earth-disturbing activity of the site, including off site spoil and borrow areas that are not addressed by a separate NOI and associated SWP3.
ii. Soil types should be depicted for all areas of the site, including locations of unstable, highly erodible and/or contaminated soils.
iii. Existing and proposed one-foot (1') contours. This must include a delineation of drainage watersheds expected during and after major grading activities as well as the size of each drainage watershed in acres.
iv. The location of any delineated boundary for required riparian setbacks.
v. Conservation easements or areas designated as open space, preserved vegetation or otherwise protected from earth disturbing activities. A description of any associated temporary or permanent fencing or signage.
vi. Surface water locations including springs, wetlands, streams, lakes, water wells, etc., on or within two hundred (200) feet of the site, including the boundaries of wetlands or stream channels and first subsequent named receiving water(s) the permittee intends to fill or relocate for which the permittee is seeking approval from the Army Corps of Engineers and/or Ohio EPA.
vii. Existing and planned locations of buildings, roads, parking facilities, and utilities.
viii. The location of all erosion and sediment control practices, including the location of areas likely to require temporary stabilization during the course of site development.
ix. Sediment traps and basins noting their sediment storage and dewatering (detention) volume and contributing drainage area. Ohio EPA recommends the use of data sheets (see Ohio EPA's Rainwater and Land Development Manual and website for examples) to provide data for all sediment traps and basins noting important inputs to design and resulting parameters such as their contributing drainage area, disturbed area, detention volume, sediment storage volume, practice surface area, dewatering time, outlet type and dimensions.
x. 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.
xi. A separate plan and cross-section view of each individual sediment settling pond and its outlet structure. Detail drawings of the outlet structure shall indicate the following elevations:
a) Pond bottom
b) Elevation required to store the required sediment storage volume
c) For sediment basins, the elevation at which the skimmer is attached
d) For sediment traps, the top and bottom of the stone outlet section
e) Elevation required to store the dewatering volume, exclusive of the sediment storage volume
f) Elevation of the top of embankment
g) Crest of the emergency spillway
xii. Where used as a sediment settling pond during construction, the plan shall include a detailed drawing of the temporary outlet configuration of the permanent storm water basin with the following information specified:
a) Storage volume provided below the elevation at which the skimmer or other surface dewatering device is attached
b) Elevation at which the skimmer or other surface dewatering device is attached
c) Elevation at which the full dewatering zone is stored above the skimmer invert
d) 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
e) Calculations of the sediment storage volume, dewatering volume and skimmer drawdown time shall also be provided
xiii. The location of new and existing permanent stormwater management practices including pretreatment practices to be used to control pollutants in stormwater after construction operations have been completed along with the location of existing and planned drainage features including catch basins, culverts, ditches, swales, surface inlets and outlet structures.
xiv. Areas designated for the storage or disposal of solid, sanitary and toxic wastes, including dumpster areas, areas designated for cement truck washout, and vehicle fueling.
xv. Methods to minimize the exposure of building materials, building products, construction wastes, trash, landscape materials, fertilizers, pesticides, herbicides, detergents, and sanitary waste to precipitation, stormwater runoff, and snow melt.
xvi. 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.
xvii. 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.
xviii. The location of designated construction entrances where the vehicles will access the construction site.
xix. The location of any areas of proposed floodplain fill, floodplain excavation, stream restoration or known temporary or permanent stream crossings.
(Ord. 2020-58. Passed 4-20-20.)