(a) The applicant shall develop a Comprehensive Storm Water Management Plan describing how the quantity and quality of storm water will be managed after construction is complete for every discharge from the site into a water resource. The Plan will illustrate the type, location, and dimensions of every structural and nonstructural water management practice incorporated into the site design, and the rationale for their selection. The rationale must describe how these water management practices will address flooding within the site as well as flooding that may be caused by the development upstream and downstream of the site. The rationale will also describe how the water management practices minimize impacts to the physical, chemical, and biological characteristics of on-site and downstream water resources and, if necessary, correct current, or prevent predictable degradation of water resources.
(b) The Comprehensive Storm Water Management Plan shall be prepared by a registered professional engineer and include supporting calculations, plan sheets, and design details. To the extent necessary, as determined by the County Drainage Engineer, a Registered Professional Surveyor shall perform a site survey to establish boundary lines, measurements, and land surfaces.
(c) The County Drainage Engineer shall prepare, maintain and update, as necessary, procedures providing specific criteria and guidance for designing storm water management systems. The County Drainage Engineer shall make the final determination as to whether the practices proposed in the Comprehensive Storm Water Management Plan meet the requirements of this Chapter.
(d) The Comprehensive Storm Water Management Plan shall contain an application, narrative report, construction site plan sheets, a long-term Inspection and Maintenance Agreement, and a site description with the following information provided:
(1) Site description:
A. A description of the nature and type of the construction activity (e.g. 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 description of prior land uses at the site.
D. An estimate of the impervious area and percent of imperviousness created by the construction activity.
E. Existing data describing the soils throughout the site, including the soil series and association, hydrologic soil group, porosity, infiltration characteristics, depth to groundwater, depth to bedrock, and any impermeable layers.
F. If available, details of known pollutant discharge caused by prior land uses.
G. The location and name of the immediate water resource(s) and the first subsequent water resource(s).
H. The aerial (plan view), extent, and description of water resources at or near the site that will be disturbed or will receive discharges from the project.
I. A description of the current condition of water resources, including the vertical stability of stream channels and indications of channel incision, that may be responsible for current or future sources of high sediment loading or loss of channel stability.
(2) Site map showing:
A. Limits of soil-disturbing activity on the site.
B. Soils types for the entire site, including locations of unstable or highly erodible soils.
c. Existing and proposed one-foot (1') contours. This must include a delineation of drainage watersheds expected before, during, and after major grading activities as well as the size of each drainage watershed in acres.
D. Water wells, and associated setbacks on or within 200 feet of the site, including the boundaries of wetlands or streams and first subsequent named receiving water(s) the applicant intends to fill or relocate and for which the applicant is seeking approval from the Army Corps of Engineers and/or Ohio EPA.
E. Existing and planned locations of buildings, roads, parking facilities, and utilities.
F. The location of any in-stream activities including stream crossings.
(3) Company name and contact information, including contact name, addresses, and phone numbers for the following:
A. The Professional Engineer who prepared the Comprehensive Storm Water Management Plan.
B. The site owner.
(4) Phase, if applicable, of the overall development plan.
(5) List of sublot numbers if the project is a subdivision.
(6) Ohio EPA NPDES Permit Number, and other applicable state and federal permit numbers if available, or status of various permitting requirements if final approvals have not been received.
(7) Location, including complete site address and sublot number if applicable.
(8) Location of any easements or other restrictions placed on the use of the property.
(9) A site plan sheet showing:
A. The location of each proposed post-construction storm water management practice.
B. The geographic coordinates of the site and each proposed practice in North American Datum Ohio State Plane North.
It is preferred that the entire site be shown on one plan sheet to allow a complete view of the site during plan review. If a smaller scale is used to accomplish this, separate sheets providing an enlarged view of areas on individual sheets should also be provided.
(10) The Inspection and Maintenance Agreement, required for water management practices under this Chapter, shall be a stand-alone document between the County and the applicant, and shall contain the following information and provisions:
A. The location of each storm water management practice, including those practices permitted to be located within a riparian setback area, as allowed under Section 937.06 of the Codified Ordinances of the County of Summit, and identification of the drainage area served by each water management practice.
B. A schedule for regular maintenance for each aspect of the storm water management system and a description of routine and non-routine maintenance tasks to ensure continued performance of the system as detailed in the approved Comprehensive Storm Water Management Plan. This schedule may include additional standards, as required by the County Drainage Engineer, to ensure continued performance of storm water management practices permitted to be located within a riparian setback area, as allowed under Section 937.06 of the Codified Ordinances of the County of Summit.
C. The location and documentation of all access and maintenance easements on the property.
D. Identification of the landowner(s), organization, or political subdivision responsible for long-term maintenance, including repairs, of the water management practices.
E. A provision allowing the County to enter upon the property to conduct inspections as necessary to verify that the water management practices are being maintained and operated in accordance with this Chapter.
F. The County Drainage Engineer shall keep records of site inspections which will be made available to the parties responsible for the maintenance of the storm water management practices. The inspection report shall indicate any non-compliance, and the required corrective actions to bring the storm water management practices into compliance.
G. An acknowledgment that if the County notifies the landowner(s), organization, or political subdivision responsible for maintenance of the problems that require correction, the specific corrective actions shall be taken within a reasonable time frame as determined by the County.
H. An acknowledgment that the County is authorized to enter upon the property to perform the corrective actions identified in the inspection report if the landowner(s), organization, or political subdivision responsible for maintenance does not make the required corrections in the specified time period. The landowner(s), organization, or political subdivision responsible for maintenance shall reimburse the County within 10 days of receipt of invoice, for all expenses incurred.
I. The method of funding long-term maintenance and inspections of all storm water management practices.
J. A release of the County from all damages, accidents, casualties, occurrences, or claims that might arise, or be asserted, against the County from the construction, presence, existence, or maintenance of the storm water management practices.
The applicant must provide a draft of this Inspection and Maintenance Agreement as part of the Comprehensive Storm Water Management Plan submittal. Prior to construction, the draft of the Inspection and Maintenance Agreement must be in the form approved by the County Drainage Engineer. Prior to the completion of construction and final inspection approval of the site, the Inspection and Maintenance Agreement must be signed by the landowner(s), organization or political subdivision responsible for maintenance, the County Drainage Engineer and the County Executive and recorded with the County Fiscal Officer. The landowner(s), organization or political subdivision responsible for maintenance is responsible for the recording of the same. The County Executive hereby has the authority to execute said agreement on behalf of the County without prior approval of the Council.
(11) The applicant shall submit calculations for projected water runoff flows, volumes, and timing into and through all storm water management practices for flood control, channel protection, water quality, and the condition of the habitat, stability, and incision of each water resource and the floodplain, as required in Section 943.09 of this Chapter. These submittals shall be completed for both pre-and post-development land use conditions and shall include the underlying assumptions and hydrologic and hydraulic methods and parameters used for these calculations. The applicant shall also include critical storm determination and demonstrate that the runoff from upper watershed areas have been considered in the calculations.
(12) Prior to construction, the applicant shall provide the names, addresses, and phone numbers of all contractors and subcontractors, where available, involved with the implementation of the Comprehensive Storm Water Management Plan, and a document containing their signatures, acknowledging that they have reviewed and understand the requirements and responsibilities of the Comprehensive Storm Water Management Plan.
(13) The location and description of existing, and proposed drainage patterns, associated riparian setbacks, and water management practices, including any related storm water management practices beyond the development area and the larger common development area.
(14) For each water management practice to be employed on the development area, include the following:
A. Detail drawings showing the location and size, the maintenance requirements during and after construction, and design calculations.
B. Final site conditions including storm water inlets and permanent nonstructural and structural water management practices. Details of water management practices shall be drawn to scale and shall show volumes and sizes of contributing drainage areas.
C. Any other structural and/or nonstructural water management practices necessary to meet the design criteria in this Chapter, and any supplemental information requested by the County Drainage Engineer.
(Ord. 2013-364. Adopted 8-26-13.)
(Ord. 2013-364. Adopted 8-26-13.)