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j/1 Bonestroo Rosene Anderlik& I Associates Engineers & Architects March 16, 2000 Mr. Paul Weinberger Zoning Administrator/Planner City of Orono Post Office Box 66 Crystal Bay, MM 55323 Re: Walfred Properties/Snyders Site File No. 139GEN-2567 Bonestroo. Rosene. AnOe'fik ^na Associates, inc is an Affirmative Action/Equai Opportunity Employer Principals Otto G Bone*.troo PE • Joseph C Anderlik. PE • L Sorvala. PE • Glenn R Cook. PE • PoOen G Schurtcht. PE • Jerry A Bourdon PE • Robert W Rosene. PE . Rich«<rcJ E Turner. PE- and Susan ,V1 Eberim. C PA . Senior Consultants Associate Principals Howard A Sanford. PE. • Keith A. Gordon. PE • Robert R. Pfefferie. P£. • Richard W Foster. PE • Oavid O Loskota. PE. • Robert C Russek. A I A • Mark A Hanson. PE • M chaei T. Rautmann. PE • Ted K.Fieid. PE • Kenneth P Anderson. PE. • Mark R. Rolfs. PE. • Sidney P Williamson. PE. L S • Robert F Kotsmith • Agnes .M Ring • Allan Rick Schmidt. PE. Offices: St Paul. Rochester. Wiilmar and St Cloud VN • .Milwaukee. Wi Weosite WWW bonestroo com I'I I 7 Cl I r ur unOjvo Dear Paul: We have reviewed the preliminary grading and utility plan for the proposed Snyders site in Navarre. The site is located on the east side of Shadywood Road (CSAH 19) and north of Navarre Lane and Shoreline Drive (CSAH 15). We have the following comments in regards to engineering matters: 1. Overall: The scale shown on the plan set (1 ”=30’) does not agree with the dimensions shown on the drawing (sanitary sewer lengths), it appears that the drawing was plotted at some other scale. For this reason we were unable to verify such things as parking lot grades, pipe inverts, pond capacities, etc. Once a revised scalable drawing is submitted we will complete our review. 2. Sanitary Sewer: The existing sanitary sewer is shown through the proposed ponding area. The plans show a proposed realignment of the sewer through this area. The revised alignment shows the sewer approximately 7-feet away from an existing water main where 10-feet is the standard. The sewer should be relocated outside the normal water level (NWL) of the pond. Plans should be submitted to the Department of Health for their approval. The proposed sewer realignment falls outside the property. Additional land or easements will need to be acquired to construct the pond and sanitary sewer. The sanitary sewer should have a minimum of 6-feet of cover or should be insulated. All sanitary and storm sewer manholes are required to have an e.<terior sealing sleeve as ma'mfactured by Infi-.Shield or an approved equal. Any connections to existing manholes shall be core drilled and a rubber boot installed. All applicable City Standard Details should be included in the final plan set. 3. Grading: We recommend that access and parking lot grades not exceed 4*^. The proposed design may be within these parameters but we cannot verify until we get a scalable plan. The proposed retaining walls are nearly 20-feet tall in some locations. Retaining wall design and details should be provided tor review . two tier wall design may be necessary w here wall heights approach 20 feet. Some type of barrier will be necessary above the wall in some locations for safety purposes. 4.Drainage/Ponding: As previously stated, the proposed pond lies outside the property boundaries, the applicant should provide details as to how the pond can be constmeted and how it may impact the existing wetland. The pond should be sized according to NURP standards using a 2.5-inch rainfall over the contributing drainage area. Calculations submitted used a 2-inch rainfall and should be revised. The pond will require an outlet structure capable of providing 1-foot of skimming as shown in City Standard Detail STO-8A. The pond should be constructed in accordance with City Standard Detail STO-12. Pond and storm sewer calculations should be revised and resubmitted along with a drainage area map. It is unclear where the proposed catch bac'n on the north side of the site drains to. Riprap should be provided at all outlets. Storm sewer should be reinforced concrete pipe. Final plans should show plan and profile views 2335 West Highway 36 - 5t. Paul, MN 55tl3 ■ 651-636-4600 ■ Fax: 651-636-1311