(a) In order to control sediment pollution of water resources, the applicant shall submit a SWP3 in accordance with the requirements of this regulation.
(b) The SWP3 shall include Best Management Practices (BMPs) and Stormwater Control Measures (SCMs) adequate to prevent pollution of public waters by soil sediment from accelerated stormwater runoff from development areas.
(c) The SWP3 shall be certified by a professional engineer, a registered surveyor, certified professional erosion and sediment control specialist, or a registered landscape architect.
(d) The SWP3 shall be amended whenever there is a change in design, construction, operation or maintenance, which has a significant effect on the potential for the discharge of pollutants to surface waters of the state or if the SWP3 proves to be ineffective in achieving the general objectives of controlling pollutants in stormwater discharges associated with construction activity.
(e) The SWP3 shall incorporate measures as recommended by the most current online edition of Rainwater and Land Development as published by the Ohio Environmental Protection Agency and shall include the following information:
(1) A cover page or title identifying the name and location of the site, the name and contact information of all construction site operators, the name and contact information for the person responsible for authorizing and amending the SWP3, preparation date, and the estimated start and completion dates for construction.
(2) A copy of the permit requirements (attaching a copy of the current Ohio EPA NPDES Construction General Permit is acceptable).
(3) Site description: The SWP3 shall provide:
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. An estimate of the impervious area and percent of imperviousness created by the land disturbance.
d. A calculation of the run-off coefficients for both the pre-construction and post-construction site conditions.
e. 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.
f. A description of prior land uses at the site.
g. 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.
h. The location and name of the immediate receiving stream or surface water(s) and the first subsequent receiving water(s) and the aerial 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. For discharges to a municipal separate storm sewer system (MS4), the point of discharge to the MS4 and the location where the MS4 ultimately discharges to a water resource shall be indicated.
i. List TMDLs applicable for the site and demonstrate that appropriate BMPs or stormwater control measures (SCMs) have been selected to address these TMDLs. [A TMDL identifier table for Northeast Ohio communities is available at http://www.neohiostormwater.com/]
j. For subdivided developments, a detail drawing of a typical individual lot showing standard individual lot erosion and sediment control practices. This does not remove the responsibility to designate specific erosion and sediment control practices in the SWP3 for areas such as steep slopes, stream banks, drainage ways, and riparian zones.
k. Location and description of any stormwater discharges associated with dedicated asphalt and dedicated concrete plants associated with the development area and the best management practices to address pollutants in these stormwater discharges.
l. A log documenting grading and stabilization activities as well as amendments to the SWP3, which occur after construction activities commence.
m. Each temporary and permanent stormwater practice shall be designated with an individual identification number.
n. Site map showing:
(i) Limits of soil-disturbing activity of the site, including off site spoil and borrow areas.
(ii) Soils types should be depicted for all areas of the site, including locations of unstable or highly erodible soils.
(iii) 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.
(iv) Surface water locations including springs, wetlands, streams, lakes, 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.
(v) Existing and planned locations of buildings, roads, parking facilities, and utilities.
(vi) 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.
(vii) Sediment and stormwater management basins including their sediment settling volume and the maximum expected disturbed area that will be directed to the sediment pond during construction. The plan should include a summary of the following:
A. The required sediment storage and dewatering volumes
B. The provided sediment storage and dewatering volumes
C. The weir length or skimmer size, as applicable
D. The weir length or skimmer size provided
(viii) Data sheets for all sediment traps, sediment basins, and SCMs that identify contributing drainage area, disturbed area, water quality volume, sedimentation volume, dewatering volume, practice surface area, facility discharge and dewatering time, outlet type and dimensions, and any other relevant parameters for each practice.
(ix) A separate plan and profile view of each individual sediment settling pond and its outlet structure. Detail drawings of the outlet structure shall indicate the following elevations:
A. Pond bottom
B. Elevation required to store the required sediment storage volume
C. For sediment basins, the elevation at which the skimmer is attached
D. For sediment traps, the top and bottom of the stone outlet section
E. Elevation required to store the dewatering volume, exclusive of the sediment storage volume
F. Elevation of the top of embankment
G. Crest of the emergency spillway
(x) Where used as a sediment-settling pond during construction, the plan shall include a detail drawing of the temporary outlet configuration of the permanent stormwater basin with the following information specified:
A. Storage volume provided below the elevation at which the skimmer or other surface dewatering device is attached
B. Elevation at which the skimmer or other surface dewatering device is attached
C. Elevation at which the full dewatering zone is stored above the skimmer invert
D. Any temporary modification to permanent outlet orifices or weirs required to ensure no discharge below the skimmer invert and only the skimmer controls the discharge up to the top of the dewatering volume.
E. Calculations of the sediment storage volume, dewatering volume and skimmer drawdown time shall also be provided
(xi) The location of permanent SCMs to be used to control pollutants in stormwater after construction operations have been completed.
(xii) 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.
(xiii) Methods to minimize the exposure of building materials, building products, construction wastes, trash, landscape materials, fertilizers, pesticides, herbicides, detergents, and sanitary waste to precipitation, stormwater runoff, and snow melt.
(xiv) Measures to prevent and respond to chemical spills and leaks. Applicants may also reference the existence of other plans (i.e., Spill Prevention Control and Countermeasure (SPCC) plans, spill control programs, Safety Response Plans, etc.) provided that such plan addresses this requirement and a copy of such plan is maintained on site.
(xv) Methods to minimize the discharge of pollutants from equipment and vehicle washing, wheel wash water, and other wash waters. No detergents may be used to wash vehicles. Wash waters shall be treated in a sediment basin or alternative control that provides equivalent treatment prior to discharge.
(xvi) The location of designated stoned construction entrances where the vehicles will ingress and egress the construction site.
(xvii) The location of any in-stream activities including stream crossings.
(4) A soils engineering report. The Village of Gates Mills Engineer may require the SWP3 to include a Soils Engineering Report based upon his/her determination that 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 of Gates Mills Engineer shall be incorporated in the grading plans and/or other specifications for site development.
a. Data regarding the nature, distribution, strength, and erodibility of existing soils.
b. If applicable, data regarding the nature, distribution, strength, and erodibility of the soil to be placed on the site.
c. Conclusions and recommendations for grading procedures.
d. Conclusions and recommended designs for interim soil stabilization devices and measures, and for permanent soil stabilization after construction is completed.
e. Design criteria for corrective measures when necessary.
f. Opinions and recommendations covering the stability of the site.
(Ord. 2016-45. Passed 12-13-16.)