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477 Temperance Street I St. Paul, MN 55101 1 (651) 286-8450 August 2, 2017 Ms. Rachel Juba, City Planner City of Hugo 14669 Fitzgerald Avenue North Hugo, MN 55038 Re: Preliminary Site Plan Review Xcel Energy Gas Training Facility — Phase 4 WSB Project No. 010372-000 Dear Ms. Juba: We have reviewed the preliminary site plan and drainage analysis/calculations submittal for the above - referenced project. In particular, we have reviewed the following plans related to this particular request: • Plan set (8 sheets) dated June 12, 2017, prepared by RSP Architects and Rehder & Associates • Storm Water Management Calculations dated June 12, 2017, prepared by Rehder & Associates Based on the review of the application materials, we offer the following comments related to this application: General 1. Phase 4 improvements include construction of a future 12,000 square foot substation building, construction of a 0.91 acre gas training site, and the associated bituminous driveway extension to match into previous phases of this project. A lot combination is proposed to eliminate the northern property line and combine with the adjacent parcel to the north, as both parcels are owned by Xcel Energy. Stormwater basins for pretreatment and infiltration are proposed to manage stormwater runoff on site. The project site was previously approved for a total of 50,000 square feet of building area. After the proposed improvements, the new building area totals 53,000 square feet (plus small house simulators). From a stormwater perspective, the increase in building area is already taken into account in the new impervious totals, and should not negatively affect the site's overall drainage. Utilities 3. No additional site utility work for water or sanitary sewer will be needed beyond what has been proposed for previous phases of this project. Stormwater Management 4. The stormwater treatment facilities approved under Phase 1 have been designed to treat the runoff for up to the Phase 3 improvements. 5. The Phase 4 improvements include an increase in impervious area of 1.03 acres (0.64 acres current & 0.39 acres future). The applicant states that the existing pretreatment basin and infiltration basin have the capacity to treat an additional 0.30 acres of impervious area. We are requesting that the applicant complete an as -built (or pond survev) of the existinci infiltration/pretreatment basins to confirm the available storage. Building a legacy —your legacy. Equal Opportunity Employer I wsbeng.com K:1010372.0001AdminTocs\LTR-rjuba-Xcel Energy Training 080217.do