12/20/2006 Env Bd Packet - Laserfiche WebLink

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• • • Nature's Refuge DRAFT DECEMBER 14, 2006 EAW Record of Decision page 12 Response: Site - specific data has been collected including infiltration parameters using a double -ring infiltrometer for existing and impacted portions of the property. In addition, surface water and groundwater data has been collected throughout 2006. This data is being used in the development of a hydrologic model of the project site. The proposer has met with the RCWD to discuss the model development and looks forward to continuing collaboration with the RCWD in finalizing the model to represent the existing and constructed environment. The model results will be an important component of the required RCWD permit process. • The Minnesota Pollution Control Agency (MPCA) notes that a Section 401 Water Quality Certification from the MPCA is needed for the issuance of a Section 404 Permit from the U. S. Army Corps of Engineers. The 401 Certification should be included in the list of permits and approvals in Item 8 of the EAW. Although the MPCA will likely waive its 401 authority, an application for the certification is still necessary. Response: The City thanks the MPCA for this clarification and acknowledges the need for the 401 Certification as one of the needed approvals. • The Minnesota Pollution Control Agency (MPCA) comments that to be effective, infiltration areas should not be compacted during construction or receive construction runoff. Soil ripping may be necessary if soil compaction occurs. • The Minnesota Pollution Control Agency (MPCA) comments that it is a state requirement that three feet of separation be provide between the bottom of the infiltration bsins and the seasonally saturated groundwater table. This may be difficult to achieve give the relatively shallow groundwater table. • MPCA recommends that information be provided to homeowners at the time of sale to ensure they understand what a rain garden is, how it works, and why they are important.