[Ord. No. 2601, 2-28-2017]
Provisions of this Chapter shall apply to all residential and non-residential site alterations. These requirements are in addition to, and do not replace or supersede, any other applicable stormwater regulations established under State law and approval or exemption from these requirements does not constitute approval or exemption from stormwater management regulations established under State law or from other applicable local, State or Federal regulations.
Grandfather Provisions. This Chapter shall not apply to the following activities:
Work consisting of the repair or maintenance of any lawful use of land that is zoned and approved for such use on or before the effective date of this Chapter.
Existing development and ongoing land disturbance activities, including, but not limited to, existing agriculture, silviculture, landscaping, gardening and lawn maintenance, except that new development or land disturbance activities on such properties will be subject to all applicable zoning and buffer requirements.
Any land development activity that is under construction, fully approved for development, scheduled for permit approval or has been submitted for approval as of the effective date of this Chapter.
Land development activity that has not been submitted for approval, but that is part of a larger master development plan, such as for an office park or other phased development that has been previously approved within two (2) years of the effective date of this Chapter.
Exemptions. The following specific activities are exempt from this Chapter. Exemption of these activities does not constitute an exemption for any other activity proposed on a property.
Activities for the purpose of building one (1) of the following:
A stream crossing by a driveway, transportation route or utility line;
Public water supply intake or public wastewater structures or stormwater outfalls;
Intrusions necessary to provide access to a property;
Public access facilities that must be on the water including boat ramps, docks, foot trails leading directly to the river, fishing platforms and overlooks;
Unpaved foot trails and paths;
Activities to restore and enhance stream bank stability, vegetation, water quality and/or aquatic habitat, so long as native vegetation and bioengineering techniques are used.
Public Sewer Line Easements. This includes such impervious surface cover as is necessary for the operation and maintenance of the utility, including, but not limited to, manholes, vents and valve structures.
Land development activities within a right-of-way existing at the time this Chapter takes effect or approved under the terms of this Chapter.
Within an easement of any utility existing at the time this Chapter takes effect or approved under the terms of this Chapter, land disturbance activities and such impervious surface cover as is necessary for the operation and maintenance of the utility, including, but not limited to, manholes, vents and valve structures.
Emergency work necessary to preserve life or property. However, when emergency work is performed under this Section, the person performing it shall report such work to the Public Services Department on the next business day after commencement of the work. Within ten (10) days thereafter, the person shall apply for a permit and perform such work within such time period as may be determined by the Public Services Department to be reasonably necessary to correct any impairment such emergency work may have caused to the water conveyance capacity, stability or water quality.
Any activities approved under a 404 permit issued by the Corps of Engineers and 401 water quality certification issued by the Missouri Department of Natural Resources.
[Ord. No. 2601, 2-28-2017]
Purpose And Objective. The City of Olivette recognizes that redevelopment of property, either in the form of expansion or new construction, in a developed community is unique and challenging as it relates to managing stormwater. Given that redevelopment in Olivette, whether residential or non-residential, occurs on a lot by lot basis, addressing stormwater issues that go beyond the scope of the property being developed is limited.
In an effort to adequately plan for and resolve stormwater issues on a City-wide basis as individual lots redevelop, the adoption of the following underlying principles are intended to provide the City guidance during the review of site alterations. These principles will be applied so as to manage stormwater on two (2) levels:
Applications for site alterations approvals shall be designed and reviewed in accordance to the following acceptable principles:
Encourage the reduction of:
Disturbance to preserved greenspace, buffers, zoning setbacks, and sensitive areas such as flood plains and stream buffers;
Impervious surface areas such as rooftops, parking lots, sidewalks, roads, etc.;
Stormwater generation and the amount of stormwater leaving the site;
The impact to environmentally sensitive areas; and
Promote the use of pervious surface materials, such as permeable paver blocks, porous asphalt, porous concrete and green roofs.
Encourage the stormwater generated on the site grounds to filter, disperse and permeate on the site grounds through the use of overland flow to vegetated buffers and other "green" infrastructure techniques that promote infiltration.
Avoid the direct flow of stormwater generated from impervious surface areas to the storm sewer system.
Encourage the installation of engineered systems that treat stormwater runoff and/or reduce peak stormwater runoff rates using techniques that employ vegetation and infiltration.
Adequately treat stormwater before discharge.
Stormwater controls shall be maintainable and enforceable.
Acceptable Practices. To promote the adopted principles, the City of Olivette has adopted the following two (2) documents developed by the MSD as reference resources for acceptable practices and tools to manage stormwater, as may be revised from time to time: