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Updated January 2025 – Gem Lake Consolidated Land Use Ordinance No. 131 122 <br /> <br /> <br />6. Emergency response (environmental, spill, safety). <br /> <br />4. Maintenance is required for all stormwater practices constructed in compliance with these Policies. The <br />City will conduct periodic inspection of stormwater practices. <br /> <br />5. When land used by stormwater management facilities is public land or public right -of-way, easements <br />under this section will not be required, and a written agreement between the City and applicant may be <br />executed in lieu of the recorded maintenance agreement. <br /> <br />6. A maintenance agreement between the site owner and City must be completed, including a plan prepared <br />by the site owner for maintenance of any stormwater management facilities that identifies the maintenance <br />activities and frequency of activities for each permanent stormwater management system proposed, <br />including but not limited to street sweeping, pond inspection, sediment removal and disposal, etc. <br /> <br />6. Stormwater Management Plan. A stormwater management plan shall be submitted for review and approval and <br />include the following: <br /> <br />1. A complete and thorough project narrative, including: <br /> <br />1. The name, address, and contact information for the project. <br /> <br />2. A description of the project, including a summary of existing and proposed impervious areas. <br /> <br />3. A description and exhibit of on-site and contributing existing and proposed sub watersheds, with <br />flow directions/patterns and discharge points. <br /> <br />4. Computations and data tables for stormwater runoff volume, water quality, and rate analyses for <br />existing and proposed conditions. <br /> <br />5. All hydrologic and hydraulic computations completed to design the proposed stormwater <br />management facilities. Model summaries must be submitted. The summaries shall include a map <br />that corresponds to the drainage areas in the model and all other information used to develop the <br />model. If regional facilities are used for compliance, computations demonstrating the overall <br />regional function of the facility shall be submitted, including maint enance agreement <br />documentation. <br /> <br />6. Soil and geotechnical information, including soil types, groundwater investigation, soil <br />conditions within five feet from the bottom of any proposed infiltration facilities, and infiltration <br />capacity of soils, as applicable. <br /> <br />7. Other supplemental information as deemed necessary by City staff. <br /> <br />2. Construction plans or exhibits, showing: <br /> <br />1. Project limits and property lines including the location of any existing and proposed utilities and <br />easements. <br /> <br />2. Location, alignment and elevation of proposed and existing stormwater facilities. <br /> <br />3. Delineation of existing on-site wetlands, shoreland and/or floodplain areas. Removal or <br />disturbance of stream bank and shoreland vegetation should be avoided. <br /> <br />4. Existing and proposed 100-year high water level elevations on-site. <br /> <br />5. Existing and proposed site contour elevations related to NAVD 1988 datum, including directions <br />or flow and all discharge points. <br /> <br />6. Specifications of all proposed stormwater management facilities. <br /> <br />7. Provision of easements for maintenance access to detention basins, constructed wetlands and <br />other stormwater management facilities.