06/10/2020 P&Z Packet - Laserfiche WebLink

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wsb Memorandum To: Katie Larsen, City Planner, City of Lino Lakes From: Kelsey Gelhar, WSB & Associates Diane Hankee, City Engineer, City of Lino Lakes Date: June 3, 2020 Re: Laborers Training Center CUP Plan Review — WSB Project No. 016201-000 WSB has reviewed the Conditional Use Permit Plans for the Laborers Training Center Site located at 2350 Main Street, Lino Lakes, MN, prepared by Barr Engineering. These comments are based on review of the following plan sets and documents: • Laborers Training Center Plan Set prepared by Barr Engineering dated May 11, 2020 • Stormwater Management Plan prepared by Barr Engineering dated May 2020. • Street Vacation Exhibit prepared by Sunde Land Surveying received May 11, 2020 • Laborers Training Center updated access road plans received May 26, 2020 Engineering • Erosion Control & Grading The Laborers Training Center plans include site grading for a new building pad, additional parking lot areas, an access road, and proposed storm water ponds. Comments: 1. Turn off the proposed improvements on the Existing Conditions, Removals, and Erosion Control Plan — South (G-05). 2. Please add drainage arrows to the grading plans to indicate the direction of surface flow. 3. How are the 919 contours tying into the existing site grading in the southwest corner of the parking lot? (C-03 - additional parking south of existing lot). 4. The SWPPP is being reviewed by the City of Lino Lakes Environmental Coordinator. • Stormwater Management The stormwater on the site flows to the south to an existing regulated wetland. After the proposed improvements, the surface water will flow through two new ponds. East Pond is located on the east side of the site, just south of the proposed building. East Pond will collect surface water from the access road and from the area between the existing building and the proposed building. West Pond is located on the west side of the site, just south of the existing paved parking area. West Pond will collect surface water from the existing parking lot and the proposed additional parking area. Both ponds will discharge to an existing wetland to the south. During the project, approximately 2.03 acres of new impervious surfaces including the building, parking lots, and access road will be constructed, 1.47 acres of existing impervious areas will be reconstructed, and a total area of 6.96 acres will be disturbed. Soil borings taken onsite indicate that the soils are stiff Sandy Lean Clay, classified as B/D or C/D. The water surface elevation of onsite wetlands indicate that the water table may be within 6' of the existing building finished floor elevation. Due to poor soils and a high groundwater table in the site, infiltration is not feasible. The applicant used a HydroCAD model based on the Atlas 14, 24-hour storms to design the storm sewer