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Pequot Lakes City Council Wastewater Treatment Facility (WWTF) Facility Plan Draft Options for Effluent Disposal March 4, 2014 For Discussion Only - Draft — For Discussion Only • There will be operations on both sides of the highway. • Additional flow, eventually, will require additional acres and subsurface piping. • It will still require groundwater monitoring wells around the perimeter. D. Pipe to Wetland Complex — Cloverleaf Lake to the East • It will require additional treatment. • It is a surface discharge, so it will require a whole new permit and operations. • The City can use most, if not all, the land south of Derksen Road for other purposes. • There is no surface spray. • The City will require some land purchase for the outlet pipe. • There will be operations only on the east side of the highway. • It does provide for treatment of increased flow with no new equipment (as long as the stabilization ponds are below capacity). • There still may be some groundwater monitoring wells needed. E. Pipe to Sibley Lake — Mayo Lake to the West • Basically same issues as above pipe option, although a longer and more costly outlet pipe. Pipe to the Preserve Golf Course • It will require additional treatment. • It is a surface discharge, so it will require a whole new permit and operations. • The City can use most, if not all, the land south of Derksen Road for other purposes. • The Preserve has to be a willing partner, and there will need to be a legal agreement between the two — also agreed to by the MPCA. • The City will require some land purchase or permanent easement for the transmission pipe. • There will be operations only on the east side of the highway. • Increases in flow will need to be carefully coordinated with the golf course. • It will still require some groundwater monitoring wells. NOTE that mainly due to the permit and treatment requirements, we do not envision pursuing in any detail the three above "pipe" to surface discharge options. G. Rapid Infltration Basins • There is no cover crop to help "treat" wastewater effluent before going through the soil into the groundwater, so there may need to be additional treatment after the stabilization ponds. • The City already has the land. The City can use the land on the west side of the highway, and probably some on the east, for other purposes. • There will be operations only on the east side of the highway. • While impacted during winter months, it can be used for a longer period of time during the year than surface irrigation. • There is no surface spray. • As long as the stabilization ponds are below capacity, additional basins could be constructed to handle additional flow. • It will still require groundwater monitoring wells around the perimeter. Page 2 of 2