§ 92-16. Stormwater BMP construction plans; submittal, review and approval procedures requirements.

(a)

The applicant will submit two copies (one hard copy and one electronic copy) of final construction plans for stormwater BMPs with a letter of transmittal submitted to the city with the final site plan/subdivision plan review. Construction or building permits shall not be issued until approval of the construction plans.

(b)

The construction plans shall be drawn to a scale no smaller than 1" = 50', and on sheets no larger than 24" x 36". The scales used shall be standard engineering scales and shall be consistent throughout the plans. When plans have been completed with computer aided design technology, locations should be geo-referenced and a copy of the electronic file shall also be provided. The construction plans shall include:

(1)

Proposed stormwater management facilities (plan and profile).

(2)

Proposed storm drains including rim and invert elevations.

(3)

Proposed open channel facilities including slope, cross section detail, bottom elevations, and surface material.

(4)

Final sizing calculations for stormwater quality and quantity treatment facilities and stormwater conveyance facilities.

(5)

Storage provided by one-foot elevation increments.

(6)

Tributary area map for all stormwater management facilities indicating total size and average run-off coefficient for each subarea.

(7)

Analysis of existing soil conditions and groundwater elevation (including submission of soil boring logs) as required for proposed retention and infiltration facilities.

(8)

Details of all stormwater BMPs including, but not limited to:

a.

Outlet structures.

b.

Overflow structures and spillways.

c.

Riprap.

d.

Manufactured treatment system.

e.

Underground detention cross section and product details.

f.

Cross section of infiltration and/or bioretention facilities.

(9)

Final landscaping plan and details.

(10)

Final easements for stormwater management facilities.

(11)

Maintenance plan and agreement.

(c)

Construction drawings and engineering specifications shall be subject to review and approval by the city's engineer to ensure that the construction plan conforms with the approved stormwater plan and that adequate storm drainage will be provided and that the proposed stormwater management system provides adequately for water quantity and quality management to ensure protection of property owners and watercourses both within the proposed development and downstream.

(d)

A construction permit shall not be issued unless the detailed engineering drawings and specifications meet the standards of this article, applicable city ordinances, engineering standards and practices, and any applicable requirements of other government agencies. Additionally, the following information is required to be submitted:

(1)

A soil erosion permit under the Michigan Soil Erosion and Sedimentation Control Act, P.A. 451, Part 91 Public Acts of 1994 as amended, will be obtained from the appropriate agency prior to any construction.

(2)

For developments that will result in disturbance of five or more acres of land, a complete notice of coverage must be submitted to the Michigan Department of Environmental Quality, Water Bureau Resources Division, to have the discharge deemed authorized under a National Pollutant Discharge Elimination System permit.

(3)

The applicant will make arrangements acceptable to the city for inspection during construction and for final verification of the construction by a city engineer or his/her designee(s) prior to approving certificate of occupancy.

(4)

Review of construction plans by the city will not proceed until site plan approval has been granted.

(5)

Approval of construction plans by the city is valid for one calendar year. If an extension beyond this period is needed, the applicant will submit a written request to the city for an extension. The city may grant one-year extensions of the approval, and may require updated or additional information if needed. City action under this provision may be taken administratively provided that no changes to the plans and/or standards have occurred. In the event one or more such changes have occurred, city action under this provision shall be taken by the final reviewing body.

(6)

For site condominiums, complete master deed documents (including exhibits drawings) must be submitted for city review and approval prior to recording.

(Ord. No. 2017-17 , 11-6-17)