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Ordinance amending Sec. 24.13.040 of the Wauwatosa Municipal Code related to Stormwater Management
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The Common Council of the City of Wauwatosa do ordain as follows:
Part I. The “Section E: Definitions” portion of the “Stormwater Management” subsection of Section 24.13.040 of the Wauwatosa Municipal Code is hereby amended to insert the following definition and subsequent subsections are to be renumbered accordingly:
57. “TP” means total phosphorus.
Part II. The “Section G: Performance Standards” portion of the “Stormwater Management” subsection of Section 24.13.040 of the Wauwatosa Municipal Code is hereby amended to read in its entirety as follows:
3. Maintenance of Effort. For redevelopment sites where the redevelopment will be replacing older development that was subject to post-construction performance standards of NR 151 in effect on or after October 1, 2004, the responsible party shall meet the total suspended solids reduction and report total phosphorus reduction, peak flow control, infiltration, and protective areas standards applicable to the older development or meet the redevelopment standards of this section, whichever is more stringent.
4. Requirements. The stormwater quality and quantity management plan shall include the following:
a. Total Suspended Solids and Total Phosphorus. BMPs shall be designed, installed and maintained to control total suspended solids (TSS) and report total phosphorus (TP)carried in runoff from the post- construction site as follows:
(1) BMPs shall be designed in accordance with Table 1. or to the maximum extent practicable as provided in subdivision 2. The design shall be based on an average annual rainfall, as compared to no runoff management controls.
See Exhibit A for chart.
Part III. The “Section I: Stormwater Management Plan” portion of the “Stormwater Management” subsection of Section 24.13.040 of the Wauwatosa Municipal Code is hereby amended to read in its entirety as follows:
(d)(4). Hydrology and pollutant loading computations as needed to show compliance with performance standards. The computations shall be made for each discharge point in the development, and the geographic areas used in making the calculations shall be clearly cross-referenced to the required map(s). The plan shall include a table summarizing the drainage area, pre-project and post-project loadings and removal efficiencies for each treatment practice. If the project includes off-site drainage areas, those areas shall be incorporated into the modeling to determine treatment practice effectiveness but shall be listed separately in the table. A development cannot take credit for off-site areas and reductions without a written agreement from the off-site landowner(s).
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(h). Plan submittal shall include a digital version of the WinSLAMM*.mdb file(s) and a digital representation of post-construction drainage area(s) tributary to each individual treatment practice in ESRI GIS Shapefile or Geodatabase format, Autodesk AutoCAD (*.dwg), or other format approved by the City.
Part IV. The “Section J: Maintenance Agreement” portion of the “Stormwater Management” subsection of Section 24.13.040 of the Wauwatosa Municipal Code is hereby amended to read in its entirety as follows:
(2)(a): Identification of the stormwater facilities and designation of the drainage area served by the facilities shown on an exhibit.
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(2)(b): A schedule for regular inspection and maintenance of each aspect of the stormwater management system consistent with the stormwater management plan required under Section 24.13.040I.
And
(2)(e): An inspection form to be used by responsible party(s) while conducting routine inspections at the frequency and schedule defined in the maintenance agreement.
And
(2)(f): Requirement that inspection records and documentation of maintenance activities is report to the city engineer annually.
Part V. This ordinance shall take effect on and after its dates of passage and publication.
By: Community Affairs Committee