(a) Erosion and Sedimentation Control Plan. The applicant shall submit an Erosion and Sedimentation Control Plan consistent with the requirements of the most recent Ohio EPA NPDES General Construction Permit. For specific requirements of the ESCP, the designer shall refer to the NPDES Ohio General Construction Permit and the Village of Obetz ESCP Check List. The ESCP must address erosion and sediment control practices during construction as well as post construction water quality practices. Post construction practices must meet the requirements of the NPDES Ohio General Construction Permit and the Franklin County Storm Water Management Manual.
(b) Qualifications of preparer. The ESCP shall be certified by a professional engineer, a registered surveyor, certified professional erosion and sediment control specialist, or a registered landscape architect.
(c) Rainwater and Land Development Manual. The ESCP shall incorporate measures as recommended by the most current edition of the Rainwater and Land Development Manual as published by the Ohio Department of Natural Resources or other technical manuals approved by the Village Engineer.
(d) Trapping efficiency. All sediment basins and traps must maintain a minimum seventy-five percent (75%) trapping efficiency throughout the construction period. Documentation that discharges are monitored must be provided to the Village for review upon request.
(e) Plan requirements. The ESCP shall at a minimum contain the following. Additional information may be required by the Village Engineer.
(1) Site description: The ESCP shall provide:
A. A description of the nature and type of the construction activity (e.g. residential, commercial, 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. An estimate of the impervious area and percent of imperviousness created by the soil-disturbing activity including a calculation of pre and post construction runoff coefficients.
D. Existing data describing the soil and, 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.
E. A description of prior land uses at the site.
F. An implementation schedule which describes the sequence of major soil disturbing operations (i.e., grubbing, excavating, grading, utilities and infrastructure installation) and the implementation of erosion and sediment controls to be employed during each operation of the sequence.
G. The location and name of the immediate receiving stream or surface water(s) and the first subsequent receiving water(s).
H. The aerial (plan view) extent and description of wetlands or other special aquatic sites at or near the site which will be disturbed or which will receive discharges from disturbed areas of the project.
I. For subdivided developments where the ESCP does not call for a centralized sediment control capable of controlling multiple individual lots, a detail drawing of a typical individual lot showing standard individual lot erosion and sediment control practices.
J. Location and description of any storm water discharges associated with dedicated asphalt and dedicated concrete plants associated with the development area and the best management practices to address pollutants in these storm water discharges.
(2) Site map showing:
A. Limits of soil-disturbing activity of the site, including off site spoil and borrow areas.
B. Soils types for all areas of the 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 during and after major grading activities as well as the size of each drainage watershed in acres.
D. Surface water locations including springs, wetlands, streams, existing detention ponds, water wells, etc., on or within 200 feet of the site, including the boundaries of wetlands or stream channels 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 all erosion and sediment control practices, including the location of areas likely to require temporary stabilization during the course of site development.
G. Sediment ponds, including their sediment settling volume and contributing drainage area.
H. Areas designated for the storage or disposal of solid, sanitary and toxic wastes, including dumpster areas, areas designated for cement truck washout, and vehicle fueling.
I. The location of designated stoned construction entrances where the vehicles will ingress and egress the construction site.
J. The location of any in-stream activities including stream crossings.
K. The riparian buffer conservation zone as required by Chapter 1704 of the Codified Ordinances shall be shown if applicable.
(3) Best management practices(BMPs). The ESCP must contain a description and location of all appropriate BMPs for each construction operation. The ESCP must clearly describe for each major construction activity the appropriate control measures; the general sequence during the construction process under which the measures will be implemented; and the person(s) responsible for implementation. The time frame for ESCP implementation shall be consistent with the current Ohio EPA NPDES Construction Permit.
(4) Description of restabilization practices. A description of control practices designed to restabilize disturbed areas after grading or construction shall be included. The ESCP must provide specifications for stabilization of all disturbed areas of the site and provide guidance as to which method of stabilization will be employed for any time of the year. Such practices may include: temporary seeding, permanent seeding, mulching, matting, sod stabilization, vegetative buffer strips, phasing of construction operations, the use of construction entrances, and the use of alternative ground cover.
(5) Maintenance. The applicant shall provide a description of maintenance procedures needed to ensure the continued performance of control practices and shall ensure a responsible party and adequate funding to conduct this maintenance.
(c) Soils engineering report. The Village Engineer may require the ESCP to include a Soils Engineering Report if the conditions of the soils are unknown or unclear to the extent that additional information is required to protect against erosion or other hazards. This report shall be based on adequate and necessary test borings, and shall contain all the information listed below. Recommendations included in the report and approved by the Village Engineer shall be incorporated in the grading plans and/or other specifications for site development.
(1) Data regarding the nature, distribution, strength, and erodibility of existing soils.
(2) If applicable, data regarding the nature, distribution, strength, and erodibility of the soil to be placed on the site.
(3) Conclusions and recommendations for grading procedures.
(4) Conclusions and recommended designs for interim soil stabilization devices and measures, and for permanent soil stabilization after construction is completed.
(5) Design criteria for corrective measures when necessary.
(6) Opinions and recommendations covering the stability of the site.
(Ord. 37-10. Passed 12-13-10.)