(a) Grading. The subdivider shall submit a Grading Plan when requesting Construction Drawing approval. The required Grading Plan shall be drawn at the same scale, and on the same base as the required final plat, and shall include specific details related to the rough and finish grading that will be performed throughout the proposed subdivision development. Each subdivision, or portion thereof, shall be planned and graded so that the surface water will drain into a storm sewer system or adjacent natural watercourses. Where necessary, grading may be extended into individual lot areas in order to provide suitable finish elevations for housing sites.
(1) All productive topsoil, as defined by the Conservation Service and approved by the Planning Commission, shall be stripped and stockpiled from the areas to be graded and shall be replaced and finish graded to a depth of not less than six (6) inches in an effort to conserve all existing topsoil.
(2) The Grading Plan shall indicate the location of all existing wooded areas. The Subdivider shall make every attempt to preserve and save all such trees that do not conflict with the location of the required improvements and/or housing sites. All grading shall be performed in such a manner that will preserve the existing tree cover.
(3) During construction of the subdivision, the Subdivider shall make provisions to conduct storm water flows through temporary or permanent swales to nearby natural watercourses or storm sewer. Desilting basins shall be installed to protect all natural watercourses and/or storm sewers.
(4) Provisions shall be made within and around the construction areas to protect the area from erosion, earth slides, and the abnormal settling or cracking of exposed earth surface.
(5) All lot areas within the subdivision shall be graded to provide adequate surface drainage.
(6) Final grading shall conform to the Grading Plan submitted by the Subdivider.
(b) Erosion Control. The Subdivider shall submit an Erosion Control Plan, which shall be reviewed and approved by the Mahoning County Soil and Water Conservation District, with his request for Construction Drawing approval. The required Erosion Control Plan shall specify the procedures and techniques and timetable to be employed by the Subdivider to control erosion during construction, and immediately following the completion of the subdivision. Included within the Subdivider’s Erosion Control Plan shall be provisions assigned to accomplish the following:
(1) The Subdivider shall carry out the development of the subdivision in such a way as to maintain as much natural vegetation as possible; thereby limiting the areas that are under construction and exposed to erosion to the smallest area practical over the shortest possible time period.
(2) The Subdivider should utilize temporary swales to direct surface drainage and storm water flows in desilting basins then into natural watercourses and/or storm sewer systems.
(3) The Subdivider shall periodically clean streets within the subdivision construction area, especially following periods of rainfall.
(4) The Subdivider shall utilize approved dust palliatives, to retard wind erosion and minimize the amount of airborne dust particles during construction.
(5) The Subdivider shall make every attempt to maintain the subdivision construction area in good and safe condition, keeping the area as free of debris as possible.
(6) Facilities for cleaning vehicles leaving the subdivision construction area, especially following periods of rainfall, shall be provided to prevent mud or other similar materials from being carried from the area into surrounding streets and into existing storm sewers.
(7) All graded areas shall be fertilized, seeded and mulched or otherwise protected by artificial means against erosion and siltation as soon as is practical.
(8) To control sediment pollution from sheet and rill erosion, no development area shall have an average annual soil loss leaving the development area which exceeds fifteen (15) tons per acre the first year commencing from the time of initial earth disturbance and five (5) tons per acre for any other year.
(c) Storm Water Management. Storm water management is a practical, feasible and desirable element in urban development. Storm water run-off can be adequately controlled in conjunction with the development of almost any site. The control program should be tailored to fit the requirements of the individual project by sound selection of alternative control methods, good technical and aesthetic design, and quality construction and maintenance.
A storm water management plan shall be submitted to the City Engineer for review and approval for all developments of 1 acre or more. Said plan shall be submitted as soon as possible after approval of the preliminary plat and in no case later than the submission of the construction drawings. The plan shall incorporate the engineering facets of the system including calculations as well as proposed maintenance and financial arrangements to perpetuate the system. Developer to provide to the City Engineer an approved OEPA Storm Water Permit issued by the OEPA.
(1) The following minimum criteria shall be used to establish the storm water management system:
To control pollution of public waters by soil sediment from accelerated stream channel erosion and to control flood plain erosion caused by accelerated storm water runoff from development areas, the increased peak rates and volumes of run-off shall be controlled such that:
A. The peak rate of run-off from the critical storm and all more frequent storms occurring on the development area does not exceed the peak rate of run-off from a one year frequency storm (of 24 hours duration) occurring on the same area under pre-development conditions.
B. Storms of less frequent occurrence than the critical storm, up to the one hundred year storm, have peak run-off rates no 3 greater than the peak run-off rates from equivalent size storms under 14 pre- development conditions.
C. As a minimum, all retention/detention pond designs shall include a two stage outlet chamber which shall release storm water based on a 10 year and 25 year storm and shall be designed with sufficient storage capacity for the 25 year storm.
(2) The critical storm for a specific development area is determined as follows:
A. Determine by appropriate hydrologic method the total volume of run-off from a one year frequency, 24 hour storm occurring on the development area before and after development.
B. From the volumes determined in (a), determine the percentage increase in volume of run-off due to development, and using this percentage, select the 24-hour critical storm from this table.
If the percentage of increase in volume of runoff is: | ||
Equal to or greater than | and less than | The critical storm for peak rate control will be |
-- | 10 | 1 year |
10 | 20 | 2 year |
20 | 50 | 5 year |
50 | 100 | 10 year |
100 | 250 | 25 year |
250 | 500 | 50 year |
500 | --– | 100 year |
(d) Protection of Air Resources.
(1) Burning. The use of burning at the project site for the disposal of refuse and debris will not be permitted.
(2) Dust Control. The Developer will be required to maintain all excavations, embankment, stockpiles, access roads, plant sites, waste areas, borrow areas, and all other work areas within or without the project boundaries free from dust which could cause the standards for air pollution to be exceeded, and which would cause a hazard or nuisance to others.
A. An approved method of stabilization consisting of sprinkling or other similar methods will be permitted to control dust. The use of petroleum products is prohibited.
B. Sprinkling, to be approved, must be repeated at such intervals as to keep all parts of the disturbed area at least damp at all times, and the Developer must have sufficient, competent equipment on the job to accomplish this if sprinkling is used. Dust control shall be performed as the work proceeds and whenever a dust nuisance or hazard occurs.
(3) The Developer shall not cause or permit any fugitive dust source from the building demolition without taking or installing reasonably available control measures to prevent fugitive dust from becoming airborne. Such reasonably available control measures shall include, but not limited to, one or more of the following which are appropriate to minimize or eliminate visible particulate emissions of fugitive dust in accordance with the Ohio Administrative Code (OAC) 3745-17-08(B). If the Contractor violates or fails to properly control fugitive dust, in accordance with OAC 3745-17- 08(B), the Contractor will be fined $2,500 per day, in accordance with the Ohio Revised Code (ORC) 3704.99.
(e) On-Site Inspection. Prior to commencement of construction, the City Engineer shall inspect natural watercourses, storm and sanitary sewers and surrounding streets to determine their existing condition. During construction and immediately following the completion of the Subdivision, the City Engineer shall inspect the subdivision construction area in order to determine the Subdivider’s compliance with the Grading, Erosion Control, and Storm Water Management Plans. The subdivider shall be notified in writing of any deficiencies and shall be directed to make whatever corrections or modifications are necessary within five (5) working days from the date he receives such written notification. Should the subdivider fail to satisfactorily correct such deficiencies, the City of Canfield, Ohio shall withhold the subdivision bond and/or final approval of the Plat until such time the deficiencies are corrected.
(Ord. 2001-13. Passed 3-21-01.)