04-05-23-PC Agenda - Laserfiche WebLink

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Jessica Jagoe – City of Arden Hills December 23, 2022 Project Narrative – Lindey’s Prime Steakhouse, Arden Hills, MN Page 3 Grading, Drainage, and Erosion Control The roadway will add a retaining wall to help preserve some of the older trees by the restaurant and the site will primarily drain similar to existing conditions. The existing parking lot will be graded slightly to improve drainage and will add a curb at the west side to better capture the existing surface runoff. Most of this will drain to new storm inlet structures, as installed by the roadway at the west perimeter of the parking lot. There will still be portions of the parking lot that will drain to the roadway, similar to existing, and the roadway design has accommodated this drainage into their calculations and design. There will be appropriate temporary and permanent erosion control measures provided by the project, as identified on the plans. In addition to a City of Arden Hills grading permit, there may be a need for a MPCA NPDES and Rice Creek Watershed District permits for erosion control. Stormwater Numerous design discussions have occurred to understand stormwater design and regulations for the site. In the end, Rice Creek Watershed District is the local government unit for stormwater and it was identified that resurfacing the existing parking lot does not qualify as new or reconstructed impervious surface, as long as the subgrade is not disturbed. It is planned for the existing parking lot pavement to be removed or reclaimed, along with a new pavement section provided, without disturbing the subgrade. Thus, the new/reconstructed pavement will be under the 10,000sf threshold and not trigger storm water compliance or permit for rate control and water quality for the site. The site will still retain parking lot surface drainage to the roadway through the driveways but will also incorporate drainage to two new storm structure inlets at the new west parking lot curb perimeter. All has been coordinated and included within the roadway project. Utilities The restaurant and house/cottage are serviced by City of Arden Hills public water and sanitary sewer, but service line locations from the roadway to the buildings are not fully documented or identified but are described as known on the plans. However, it is anticipated that the site improvements would not disturb these service lines. Electrical and communication (telephone/cable) service is provided as aerial lines to utility poles and connected to the buildings near the roof line. Generally, these are not being disturbed and to remain, however an Xcel Energy contractor has relocated one pole by the restaurant ramp and another by the house in the fall of 2022, and plan to replace a third one just east of the restaurant as part of the roadway utility pole relocation. The approximate new pole locations and aerial lines are depicted on the Utility Plan, for reference. New site lighting and future freestanding signs will be under a new electrical circuit and controls at the restaurant building and existing parking lot flood lighting will be disconnected or removed from the utility poles. It should be noted that the roadway project is relocating a hydrant from the southeast corner of the property area, further east. Preliminary discussions with the Lake Johanna Fire Department indicated acceptance of the relocated hydrant and distance to the restaurant Fire Department Connection (FDC), and this info is identified on the Utility Plan.