§ 4-271. Design requirements.

(a)

Grading. No grading is to take place prior to the developer or contractor having an approved NPDES stormwater permit and a city permit. The site shall have the required signage as required by ADEM and shall have a city permit posted. All graded sites (cut or filled) and all stockpiles shall have erosion control protection as described in an approved best management practices plan.

(b)

Best management practices plan (BMP). Prior to a city permit being issued, the developer or contractor will submit a BMP for city approval. The plan will address all proposed sediment control relative to the site.

(1)

A sequence of construction is required for the development site, and is to include stripping and clearing; rough grading; construction of utilities, infrastructure, buildings; final grading and landscaping. Sequencing shall identify the expected date on which clearing will begin, the estimated duration of exposure of cleared areas, areas of clearing, installation of temporary erosion and sediment control measures, and establishment of permanent vegetation.

(2)

The BMP will include all erosion and sediment control measures necessary to meet the objectives of this local regulation throughout all phases of construction and after completion of development of the site. Depending upon the complexity of the project, the drafting of intermediate plans may be required at the close of each season.

(3)

Seeding mixtures and rates, types of sod, method of seedbed preparation, expected seeding dates, type and rate of lime and fertilizer application, and kind and quantity of mulching for both temporary and permanent vegetative control measures will be specified.

(4)

The BMP will provide for maintenance of control facilities, and the addition of facilities should they be necessary.

(5)

Modifications to the plan shall be processed and approved or disapproved by the city in writing, and shall include major amendments of the erosion and sediment control plan submitted to the city. Field modifications of a minor nature may be made as the contractor deems necessary without written authorization.

(6)

Single family residential property less than two (2) acres in area shall not be required to submit an erosion and sediment control plan. However, all other regulations and requirements herein referred to herein shall be complied with.

(c)

Erosion control. As soon as possible, all disturbed areas are to be seeded and covered with mulch or sodded, and the application of such slope stability materials as may be required to allow germination to occur.

(1)

Soil stabilization shall be completed within five (5) days of inactivity in construction.

(2)

If seeding or another vegetative erosion control method is used, it shall become established within 30 days or the city's designated agent may require the site to be reseeded or a nonvegetative option employed.

(3)

Special techniques that meet the design criteria outlined in the SWPPP on steep slopes or in drainage ways shall be used to ensure stabilization.

(4)

Soil stockpiles must be stabilized or covered at the end of each workday. Silt fence and/or silt basins may be used.

(5)

At the close of the construction season, the entire site must be stabilized, using a heavy mulch layer or another method that does not require germination to control erosion.

(6)

Techniques shall be employed to prevent the blowing of dust or sediment from the site caused by construction vehicles or equipment. Techniques that divert upland runoff past disturbed slopes shall be employed.

(d)

Sediment control. Prior to construction startup, the site shall have barriers installed as required to prevent erosion from leaving the site. Barriers can include silt fence, hay bales, siltation ponds, aggregate bales, etc.

(1)

Settling basins that are designed in a manner that allows adaptation to provide long-term stormwater management is acceptable.

(2)

The developer or contractor may provide protection for adjacent properties by the use of an existing vegetated buffer strip in combination with perimeter controls. The buffer strip shall be used only if approved by the city's designated agent.

(e)

Slopes. The suggested maximum slope for any site is 3:1, unless the city approves a steeper slope to meet other community or environmental objectives. All slopes are to be stabilized as soon as possible. For slopes steeper than 3:1, a seeded mat or sod shall be applied and approved by the building department.

(f)

Construction site access. Temporary construction site access shall include a stone paved approach into the site. The dimensions are generally ten (10) feet by fifty (50) feet, and laid out as per the cities standard BMP detail drawings.

(1)

Excess mud which is tracked off-site by construction vehicles is to be removed from the street prior to a rain event.

(2)

Inspection. The city or designated agent shall make inspections as hereinafter required and either shall approve that portion of the work completed or shall notify the permittee wherein the work fails to comply with the BMP as approved. Plans for grading, stripping, excavating, and filling work bearing the approval of the city's designated agent shall be maintained at the site during the progress of the work. To obtain inspections, the permittee shall notify the city at least two (2) working days before the following:

a.

Start of construction.

b.

Installation of sediment and erosion measures.

c.

Completion of site clearing.

d.

Completion of rough grading.

e.

Completion of final grading.

f.

Close of the construction season.

g.

Completion of final landscaping.

(3)

The permittee or his/her agent, shall make regular inspections of all control measures in accordance with the inspection schedule outlined on the approved BMP. The purpose of such inspections will be to determine the overall effectiveness of the BMP and the need for additional control measures. All inspections shall be documented in written form and submitted to the city's designated agent at the time interval specified in the approved permit.

(4)

The city or its designated agent, shall enter the property of the applicant as deemed necessary to make regular inspections to ensure the validity of the reports.

(g)

BMP detail drawings. City-approved BMP detail drawings herein included are made a part of this plan. The developer or contractor may devise his own details for presentation to the city's designated agent for approval.

(Ord. No. 15-0817A, 8-17-2015)