2020-04-22 CC Packet - Laserfiche WebLink

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Centerville 2040 Comprehensive Plan ordinance and commence enforcement through compliance reminder letters. There are no community (multi-unit) subsurface treatment systems in Centerville. If, for some reason, a new SSTS would be the only available form of sewering an existing parcel, the City would ensure that it was designed and constructed in accordance with MPCA Rule 7080. This is, however, highly unlikely. Map 7-2 shows the location of existing SSTS within the City. Chapter 51, Municipal and Public Utilities provides regulation over SSTS in the City. I NFLOW AND I NFILTRATION GENERAL In February 2006, Metropolitan Council instituted its Infiltration/Inflow (I/I) Surcharge Program. The fundamental policy statement summarizing this not provide additional capacity within its interceptor system to serve excessive inflow and communities that use its system. Communities that exceed this threshold are required to eliminate this excess flow within a reasonable timeframe or pay a surcharge fee. Centerville has not been identified by Metropolitan Council as a municipality with excessive I/I. The City does, however, does take action to limit I/I and preserve capacity within its system. This program is described further in the following sections. SOURCES AND EXTENT OF I/I Met Council has consistently concluded that Centerville's flows during wet weather events do not show significant signs of Inflow or Infiltration (I/I). This is likely because most of the City's sewer system (both public and private) was constructed, post-1970, from largely gasketed, PVC pipe. In 2018, the City received a letter from MCES stating that, during a large rain event, peak flows spiked to over 80% of their prescribed I/I threshold. However, The City believes this spike was caused by inflow to the system through a construction site in Lino Lakes, which had its manholes exposed during the event. This Lino Lakes neighborhood is part of the Cit community flow, so any inflow would come through the Centerville system. The EPA Guide for Estimating Infiltration and Inflow (June 2014) was used to estimate the from Metropolitan Council Environmental Services, for the period of 2015 to 2018. Monthly average flows for the four-year period March to November (representative of a wet portion of Page 87