(a) Comprehensive Storm Water Management Plan Required: 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 and/or into a water resource. Comprehensive Storm Water Management Plans must meet the requirements in Ohio EPA’s current Construction General Permit and these regulations.
(1) The Plan will illustrate the type, location, and dimensions of every structural and non-structural storm water management practice incorporated into the site design, and the rationale for their selection.
(2) The rationale must address how these storm 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 storm water management practices minimize impacts to the physical, chemical, and biological characteristics of on-site and downstream water resources and, if necessary, correct current degradation of water resources that is occurring or take measures to prevent predictable degradation of water resources.
(b) Preparation by Professional Engineer: 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 Director of Engineering Services, a site survey shall be performed by a Registered Professional Surveyor to establish boundary lines, measurements, or land surfaces.
(c) Community Procedures: The Director of Engineering Services shall prepare and maintain procedures providing specific criteria and guidance to be followed when designing the storm water management system for the site. These procedures may be updated from time to time, at the discretion of the Director of Engineering Services based on improvements in engineering, science, monitoring, and local maintenance experience. The Director of Engineering Services shall make the final determination of whether the practices proposed in the Comprehensive Storm Water Management Plan meet the requirements of this Chapter. The Director of Engineering Services may also maintain a list of acceptable Best Management Practices that meet the criteria of this Chapter to be used in the City of Sandusky.
(d) Contents of Comprehensive Storm Water Management Plan: 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 soil-disturbing activity at the beginning and at the conclusion of the project.
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, the quality of any known pollutant discharge from the site such as that which may result from previous contamination 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. 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 resource locations including springs, wetlands, streams, lakes, 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 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) Contact information: Company name and contact information as well as contact name, addresses, and phone numbers for the site owner and the Professional Engineer who prepared the Comprehensive Storm Water Management Plan.
(4) Phase, if applicable, of the overall development plan.
(5) List of sublot numbers if project is a subdivision.
(6) Ohio EPA NPDES Permit Number and other applicable state and federal permit numbers, if available, of the status of various permitting requirements if 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 the location of each proposed post-construction storm water management practice. 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 smaller scale is used to accomplish this, separate sheets providing an enlarged view of areas on individual sheet should also be provided.
(10) An Inspection and Maintenance Agreement. The Inspection and Maintenance Agreement required for post-construction storm water management practices under this Chapter shall be a standalone document between the City of Sandusky and the applicant and, to the extent required based upon the nature and scope of the project, contain or reference the following information and provisions as the Director of Engineering Services may deem appropriate:
A. The location of each storm water management practice.
B. A schedule for regular maintenance for each aspect of the storm water management system and description of routine and non-routine maintenance tasks to ensure continued performance of the system as is detailed in the Comprehensive Storm Water Management Plan.
C. The location and documentation of all access and maintenance easements on the property.
D. Identification of the landowner(s), organization, or municipality responsible for long-term maintenance, including repairs, of the storm water management practices.
E. The landowner(s), organization, or municipality shall maintain storm water management practices in accordance with this Chapter.
F. Provisions relating to access, inspections and corrective actions (if needed) by the City of Sandusky, as provided in Section 935.10.
G. The method of funding long-term maintenance and inspection of all storm water management practices.
H. A release of the City of Sandusky from all damages, accidents, casualties, occurrences, or claims that might arise or be asserted against the City of Sandusky from the construction, presence, existence, or maintenance of the storm water management practices.
Alteration or termination of these stipulations is prohibited. The applicant must provide a draft of this Inspection and Maintenance Agreement as part of the Comprehensive Storm Water Management Plan submittal. Once a draft is approved, a recorded copy of the Agreement must be submitted to the City of Sandusky to receive final inspection approval of the site.
(Ord. 22-061. Passed 3-28-22.)