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(a) The minimum standards set forth below are general guidelines and shall not limit the right of the City to impose, at any time, additional, more stringent requirements, nor shall the criteria limit the right of the approving authority to waive, in writing, individual requirements. Erosion and sediment control (Storm Water Pollution Prevention) practices used to satisfy the minimum standards set forth below shall meet the specifications in the latest edition of Rainwater and Land Development:, Ohio's Standards for Stormwater Management Land Development and Urban Stream Protection (available from Ohio Department of Natural Resources, Division of Soil and Water Conservation) or other local requirements, whichever is more stringent.
(b) In order to control soil erosion and sediment pollution of water resources, the owner or the person responsible for the development area shall include these minimum practices to maintain the level of conservation established by the following standards:
(1) All soil erosion and sediment control practices shall be functional throughout all phases of earth disturbing activity. Settling facilities, perimeter controls, and other practices intended to trap sediment shall be implemented as the first step of grading and within seven (7) days from the start of grubbing. They shall continue to function until the development area is permanently restabilized.
(2) Clearing and Grubbing will be done in two (2) or more phases. The first phase will include only those locations necessary to install the perimeter soil erosion and sediment and storm water control practices. After the perimeter controls are in place and functioning the remaining phase(s) of Clearing and Grubbing may continue.
(3) Denuded areas shall have soil stabilization applied within no more than seven (7) days if they are to remain dormant for more than forty-five (45) days. Permanent or temporary soil stabilization shall be applied to denuded areas within no more than seven (7) days after final grade is reached on any portion of the site.
(4) Concentrated storm water runoff from denuded areas flowing at rates that exceed the design capacity of sediment barriers shall pass through a sediment settling facility.
A. The facility's storage capacity shall be no less than sixty-seven (67) cubic yards per acre of total drainage area. Trapping efficiency should be at least 75%.
B. Permanent Storm Water Management ponds that are designed to trap sediment during construction shall be designed to provide for a slow release of sediment laden water. Velocity dissipation devices shall be placed at the outfall channel as necessary to provide a nonerosive flow velocity from the structure to a watercourse.
(5) Sheet and rill flow runoff from denuded areas shall be diverted to a settling pond or treated by a geotextile silt fence or other approved sediment barrier. The total runoff flow treated by a sediment barrier shall not exceed the design capacity for that sediment barrier.
(6) All storm sewer inlets that accept water runoff from the development area shall be protected so that sediment-laden water will not enter the storm sewer without first being filtered or otherwise treated to remove sediment, unless the storm sewer system drains to a settling facility. Geotextile fabric under grates is not acceptable.
(7) Working In or Crossing Streams:
A. Streams including bed and banks shall be restabilized immediately after in channel work is completed, interrupted, or stopped. To the extent practicable, construction vehicles shall be kept out of streams. Where in-channel work is necessary, precautions shall be taken to stabilize the work area during construction to minimize erosion.
B. If a live (wet) stream must be crossed by construction vehicles regularly during construction, a temporary stream crossing shall be provided. Temporary stream crossings shall have hydraulic capacity and/or overflow capability to prevent upstream flooding.
(8) Measures shall be taken to prevent soil and other solids and pollutants from being transported onto surfaces where runoff is not checked by sediment controls, or onto public roads. Minimize such tracking by installing gravel construction entrances. Where such materials are transported onto a public road surface, the roads shall be cleaned thoroughly at the end of each day, or more frequently as required by the City Service Director. Said materials shall be removed from paved surfaces by shoveling or sweeping. Street washing shall be allowed only after shoveling or sweeping has removed most sediment.
(9) Sloughing and Dumping.
A. No soil, rock, debris, or any other material shall be dumped or placed into a water resource or into such proximity that it may readily slough, slip, or erode into a water resource unless such dumping or placing is authorized by the City Engineer, and, when applicable, the US Army Corps of Engineers, for such purposes as, but not limited to, constructing bridges, culverts, and erosion control structures.
B. Unstable soils prone to slipping or landsliding shall not be graded, excavated, filled or have loads imposed upon them unless the work is done in accordance with a qualified professional engineer's recommendations to correct, eliminate, or adequately address the problems.
(10) Cut and fill slopes shall be designed and constructed in a manner which will minimize erosion. Consideration shall be given to the length and steepness of the slope, soil type, up slope drainage area, groundwater conditions, and slope stabilization.
(11) Outfalls and constructed or modified channels shall be designed and constructed to withstand the expected velocity of flow from a post development, ten-year (or greater) frequency storm without eroding.
(12) A permanent vegetative cover shall be established on denuded areas not otherwise permanently stabilized. Permanent vegetation shall not be considered established until ground cover is achieved which, in the opinion of the City Engineer, covers eighty percent (80%) or more of the soil surface and provides adequate cover and is mature enough to control soil erosion satisfactorily and to survive adverse weather conditions.
(13) A riparian zone of the minimum depth of 25 feet measured on a flat, level line at right angles to the high-water mark of the stream or wetland shall be maintained as virgin, undisturbed area along any existing creek, stream, waterway or wetland area. Should a virgin area not be manageable due to proposed grade changes or other proposed site work the City Engineer may approve the design and installation of a landscaping plan intended to replace the existing plant growth. The City Engineer shall be authorized to waive the minimum 25-foot dimension in specific locations on a site where a hardship can be shown to exist and where other acceptable, permanent means of filtering runoff can be provided.
(14) All temporary erosion and sediment control practices shall be disposed of within thirty days after final site stabilization is achieved or after the temporary practices are no longer needed, unless otherwise authorized by the City Building Commissioner upon a written recommendation of the City Engineer. Trapped sediment shall be permanently stabilized to prevent further erosion, or removed from the site.
(15) All erosion and sediment control practices shall be designed and constructed to minimize maintenance requirements. They shall be maintained and repaired as needed to assure continued performance of their intended function. Sediment and erosion controls shall be inspected by the applicant or his designee once every 7 days and within 24 hours of 0.5 inch or greater rainfall amount. The applicant or his designee must keep a written log of these inspections. This log should indicate the date of inspection, name of inspector, weather conditions, observations, actions taken to correct any problems and the date action was taken. Upon a request of the City Engineer the owner shall submit these documents.
(16) During construction of underground utility lines, pipes etc. Trench dewatering devices shall discharge in an approved manner that will not adversely affect water resource or off-site property.
(17) If the construction site is subject to Ohio EPA's National Pollutant Discharge Elimination System (NPDES) Permits, a copy of all the required inspection sheets shall be submitted to the City Building Commissioner within 2 working days of the date that the inspection was conducted.
(Ord. 7665-04. Passed 1-17-05.)