Unless otherwise lawfully excused from compliance with the standards set forth in this chapter, all activity to which this chapter is applicable shall comply with the following requirements and methods for stormwater management control:
A. Stormwater, in accordance with the performance standards set forth herein, shall be directed by nonerosive means to grass infiltration areas when appropriate. Expected containment removals are as follows:
Total suspended solids | 95% |
Total dissolved solids | 50% |
Nutrients: Nitrate | 20-50% |
Total nitrogen | 80% |
Phosphorus | 90% |
Metals | 80% + |
Organic chemicals | 60% + |
Bacteria | 99% |
An acceptable stormwater collection, treatment and disposal system shall be implemented in accordance with an approved stormwater management plan, subject to review by the city engineer. Said grass infiltration areas or other approved alternative on site stormwater collection and treatment systems may be approved in either nodal or dispersed form, subject to specific approval by the city engineer during the development review process.
B. All activity subject to this chapter shall be carried out so that the runoff of storm or other surface waters shall not be accelerated, concentrated or otherwise conveyed beyond the exterior property lines or project boundaries of the project in question except in compliance with the provisions of BMPs adopted pursuant to this chapter or as allowed through joint management of stormwater with adjoining property owners pursuant to agreement approved by the city. The quality of surface runoff shall be protected by strict compliance with the design standards and BMPs adopted pursuant to this chapter or by implementation of measures shown by a qualified, licensed professional, as defined in section 11-2-2 of this chapter, to have an effective design capability which exceeds the BMPs adopted hereby.
C. Each landowner and/or developer subject to the terms of this chapter shall develop a comprehensive stormwater plan which addresses and complies with the requirements and standards established by this chapter and any plan criteria, design standards and BMPs adopted by resolution pursuant to this chapter. Each plan for stormwater management shall be approved by a qualified, licensed professional, who shall submit both construction quality design drawings and supporting calculations for review and approval by the city engineer prior to start of construction or any land disturbing activity. Each stormwater management plan shall also identify necessary maintenance requirements.
D. Each landowner and/or developer who proposes and implements a stormwater management system for collection or treatment of stormwater in accordance with this chapter shall also establish, including assurance of adequate funding, the necessary maintenance system, including an acceptable plan for sustained functioning of the collection and treatment system, and, when requested, grant the necessary easements to a local government which may choose to provide continued maintenance of the system by public authorities or may require the owner to accomplish same. Such services may be financed by charging fees to owners and/or occupants of real property benefited by such service.
E. The city engineer is authorized to accept, review and approve plans for stormwater management required under this chapter including any site review or inspections deemed necessary by the city engineer. The owner and/or developer shall pay to the city engineer the actual costs of checking, investigating and site inspections required to carry out the purpose of this chapter. (Ord. 117, 6-24-1993)
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