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BO LTO N 2638 Shadow Lane Suite 200 M E N K Chaska, MN 55318-1172 Real People.Real Solutions. Ph: 19521 448-8838 Fax 1952)448-8805 Bolton-Menk-com February 5,2018 City of Orono Attn: Adam Edwards 2750 Kelley Parkway Orono, MN 55356 RE: #2018—00038 1180 Hunter Drive Engineering Review#1 Dear Adam: As requested, we have completed an engineering review of the documents submitted for the above referenced project. We offer the following observations, comments, and recommendations for your consideration: 1. As part of development of Mooney Lake Preserve, each individual lot(except Lots 4 & 8, Blk 2) must provide stormwater management facilities capable of restricting proposed peak runoff rates to that of existing and retaining a volume equal to 1"over new impervious surfaces on site. Calculations and drainage area maps should be submitted verifying adequate sizing of facilities based on proposed improvements. 2. Drainage and Utility Easements should be revised as necessary to adequately cover stormwater management facilities used to meet governmental requirements, including access to the outlet control device. 3. An access route to the stormwater management facilities used to meet governmental requirements, including the outlet control device, should be provided. Access route should be a minimum 8' wide. 4. Perimeter erosion control measures and protection fencing should be installed by the Contractor and inspected by City prior to any land disturbance. Contractor must provide 24 hour notice prior to inspection. 5. Protection fencing should be indicated around septic sites. 6. Details for the rain gardens should be provided to ensure adequate section and outlet control design. 7. The applicant should be required to obtain a Minnehaha Creek Watershed District(MCWD)permit. A copy of any approvals or permits required should be submitted conditional to plan approval. 8. The applicant should be required to submit a Maintenance Agreement for stormwater management facilities used to meet governmental requirements. The agreement should define maintenance responsibilities following completion of project and specify types and frequencies of inspection and maintenance activities. A report should be submitted annually to the City and MCWD briefly outlining inspections and maintenance performed during the year. 9. Record drawings of stormwater management facilities used to meet governmental requirements should be submitted upon completion of the project. H:\ORNO\C13115486\z-2018-00038_1180 Hunter Drive\1180HunterDrive-1.docx Bolton&Menk is an equal opportunity employer.