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08-19-24-SWS
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08-19-24-SWS
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<br />35 <br /> <br />Rain Gardens – Typical maintenance activities include, pruning (spring/fall), replacing plants, adding <br />mulch, pulling weeds, removing sediment, removing trash and inspection. Per the Municipal Separate <br />Storm Sewer System (MS4) Permit, inspection of rain gardens should occur annually. Public Works needs <br />to develop an updated rain garden location map and create a plan for future maintenance. Current <br />maintenance is ordered “as-needed”, addressed with the Street Maintenance Plan areas or at rain <br />gardens in highly visible areas. <br />Surface Water Ponds – Maintenance activities include removal of excessive vegetation, removal of <br />trash/debris and removal of sedimentation or dredging. Adequate access must be provided for <br />inspection, maintenance, and landscaping upkeep, including appropriate access needs for equipment <br />and vehicles for when more extensive repairs are required. Primary issues we look for during inspections <br />is clogging of the inlets and outlet, weir structure condition, erosion and gulley formation, <br />sedimentation build up and undercut of adjacent roadways or trails. Per the MS4 Permit, inspection of <br />surface water ponds should occur once with each permit cycle which is typically 5 years. Public Works <br />needs to develop an updated surface water pond map and create a plan for future maintenance and <br />rehabilitation projects. Currently, pond maintenance and rehabilitation is included in the City’s PMP <br />projects. <br />Outfall condition Inspection – Following the MS4 Permit, the City is required to inspect every municipal <br />outfall (outlet/inlet) once with each permit cycle which is typically 5 years. Arden Hills currently has 439 <br />outfalls inventoried so we will inspect roughly 90 structures each year. Through inspection, a report is <br />created to address condition, repairs needed, odor detection or inflow & infiltration concerns. <br />Grit Chambers – Public Works inspects and cleans every grit chamber annually. Grit chambers can be in <br />the form of a baffled structure, separated tanks or a simple sump style. It is important to clean these <br />structures more frequently as they are an important factor in promoting water quality by separating <br />sediment and other debris before reaching our water bodies. These are also typically installed directly <br />upstream from ponds to help reduce prolong the time needed for costly dredging activities. Public <br />Works is currently updating inventory of existing grit chamber structures. <br />Open Ditches & infiltration basins follow the same maintenance activities. Inspection for repairs or <br />erosion issues, remove debris and vegetation removal. <br />Catch Basins – Public Works conducts full structure inspections every 5 years to address any repair <br />needs. Issues to look for are inflow & infiltration, settling of surrounding pavement or curb, cracking of <br />interior structure concrete, drain tile cleaning and any blockage with flow. <br />Storm sewer mainlines – Inspection via televising camera is conducted on an as-needed basis. Full <br />inspections are completed prior to Pavement Management Program (PMP) projects to identify any <br />structural repairs needed. <br />Grading and Erosion Control Permit management – Following City Ordinance Chapter 15 (Erosion and <br />Sediment Control) along with MS4 requirements, construction site inspections are conducted for all land <br />disturbance activities for both residential projects and developments as defined within the ordinance. <br />These inspections ensure that the permit holder is staying in compliance with what is required for <br />erosion control and helps promote water quality. <br />Gopher State One Call locates for structures, sewer main along both City and County roads.
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