01/29/2003 Env Bd Packet - Laserfiche WebLink

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• Analysis: Since 1993 (the time The church was built), the Environmental Board has consistently asked new surface water management features to buffer watershed features. The Area to the North is designated as a High - Priority Protection Area in the Lino Lakes Handbook for Conservation Design. Soils in this area are sandy, and pervious. If an infiltration train were designed into the site plan, there appears to be enough separation between the OHW and a designed rainpond /swail area. The rain pond area must be in an area where the Seasonally high water table is at least 3 feet from the bottom of the pond. Please refer to (Attachment 8). The seasonally high ground -water level should be verified. Peak flow analysis indicates a .23 cfs increase in water volume flow in a two year event, a .32 cfs increase in water volume flow in a 10 year event, and a .36 increase in water volume flow for a 100 year event for the entire site. The basin should be designed if possible to accommodate this extra surface water volume, if not for the entire site. Additional ponding is shown in the turf areas. Surface -water analysis information is being reviewed by the City Engineer. The soil areas around proposed remaining pervious areas should be protected from compaction during construction. A buffer of native plants incorporated into edges and a surface- water - treatment -train should be planted. Ground story materials should be native in the ponding and drainage areas. All proposed sod areas should have at least 4 inches of topsoil tilled thoroughly into the subsoil as deep as possible. A detailed landscape plan should indicate more foundation plants. A few oak trees should be planted into the surface water treatment areas. Suggest changing the Sugar maples to a variety of Red maple or oak. Although there is no proposed lighting for the added space on the church, the possibility exists that there may be a need to light the building in the future. If this should happen, than the lighting should be down ward focused, no -spill type lighting. Environmental Board Comments: • Options: