The following shall be required in each control plan for land disturbing activities.
(A) Existing site map. A map of existing site conditions on a scale of at least one inch equals 100 feet, showing the site and immediately adjacent area containing:
(1) Site boundaries and adjacent lands which accurately identify site location;
(2) Lakes, streams, wetlands, ponds, channels, ditches, karst formations, and other water courses on and immediately adjacent to the site. (Note: Requires the completion of a groundwater management plan which shall specify surface and subsurface drainage ways, flows, and rates, and establishes a mechanism to accommodate stormwater flows and prevent sedimentation or blockage of natural drainage passages.)
(3) One hundred-year floodplain, flood fringes and floodways;
(4) Location of the predominant soil types;
(5) Vegetative cover;
(6) Location and dimensions of stormwater drainage patterns on and immediately adjacent to the site;
(7) Locations and dimensions of utilities, structures, roads, highways and paving; and
(8) Site topography at a contour interval not to exceed two feet.
(B) Plan of final site conditions. A plan of final site conditions on the same scale as the existing site map showing the site changes.
(C) Site construction plan. A site construction plan including:
(1) Locations and dimensions of all proposed land disturbing activities;
(2) Locations and dimensions of all temporary soil or dirt stockpiles;
(3) Locations and dimensions of all construction site management control measures necessary to meet the requirements of this subchapter;
(4) Chronological sequence of construction describing the relationship between the implementation and maintenance of controls, including permanent and temporary stabilization and the various stages or phases of earth disturbance and construction. The sequence of construction shall, as a minimum, include a schedule and time frame for the following activities:
(a) Preconstruction conference;
(b) Obtain permits and secure bonds;
(c) Clearing and grubbing for those areas necessary for installation of perimeter controls;
(d) Construction of perimeter controls;
(e) Inspection of perimeter controls;
(f) Remaining interior site clearing and grubbing;
(g) Location, type and estimated size of soil piles;
(h) Road grading;
(i) Grading for the remainder of the site;
(j) Utility installation and whether storm drains will be used or blocked after construction;
(k) Building, parking lot, and site construction;
(l) Final grading, landscaping or stabilization; and
(m) Removal of controls.
(5) Provisions for maintenance of the construction site control measures during construction.
(D) Control and design. A plan shall utilize the latest edition of the Indiana Handbook for Erosion Control in Developing Areas for technical guidance for all erosion and sediment control practices. A plan shall incorporate the following design criteria where applicable:
(1) Channelized runoff from adjacent areas passing through the site shall be diverted around disturbed areas, if practical. Otherwise, the channel shall be protected as described below in divisions (D)(2) and (D)(3). Sheetflow runoff from adjacent areas greater than 10,000 square feet in area shall also be diverted around disturbed areas unless shown to have resultant runoff velocities of less than 0.5 ft./sec. across the disturbed area for the set of two-year design storms. Diverted runoff shall be conveyed in a manner that will not erode the conveyance and receiving channels. (Note: Soil Conservation Service guidelines for allowable velocities in different types of channels should be followed.);
(2) For sites with ten acres or more disturbed at one time, or if a channel originates in the disturbed area, one or more sedimentation basins shall be constructed. Each sedimentation basin shall have a surface area of at least 1% of the area draining to the basin and at least three feet of depth and shall be constructed in accordance with accepted design specifications. Sediment shall be removed to maintain a depth of three feet. The basin shall be designed to trap sediment greater than 15 microns in size based on the set of two-year design storms having durations from 0.5 minutes to 24 hours. The basin discharge rate shall be sufficiently low as to not cause erosion along the discharge channel;
(3) For sites with less than ten acres disturbed at one time, filter fences, straw bales or equivalent measures shall be placed along all side slopes of the site. If a channel or area of concentrated runoff passes through the site, filter fences shall be placed along the channel edges to reduce sediment reaching the channel. Diversion ditches and other sediment control measures meeting the specifications outlined in divisions (D)(1) and (D)(2) above may be utilized at the discretion of the Planning Department;
(4) Land disturbing activity shall be performed in a construction sequence to the satisfaction of the Planning Department in order to minimize the area of bare soil exposed at any one time.
(Ord. 06-12, passed 6-26-2006)