2017-01207 - addn/remodel/repair

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• Orono High School Fieldhouse Addition Engineering Review#1 Page 2 4. The applicant will be required to submit a Maintenance Agreement for all stormwater management structures and facilities. The agreement should define maintenance responsibilities following completion of project, specify types and frequencies of inspection and maintenance activities, and designate who will conduct inspection and maintenance activities. 5. Record drawings must be submitted upon completion of the project. 6. If topsoil is to be stripped off disturbed areas and stockpiled on site, stockpile locations should be indicated on the Sediment and Erosion Control Plans, and siltfence should be indicated around stockpiles to limit potential for migration of sediment off-site. 7. A detail for the Concrete Washout Area should be included on the Site Details sheets. 8. Retaining walls greater than four feet in height are proposed. Walls four feet or greater in height must be designed by a licensed Professional Engineer. Fences should be indicated for all walls four feet or greater in height,and details should be included on Site Details as appropriate. 9. If the North Ball Field is intended to be used for football and soccer,the field should be graded to recommended field guidelines. The applicant should consider using the traditional crown method to design slopes for rectangular fields. Revisions to ditch grading and storm sewer may be necessary to accommodate correct field grading. 10. Riprap quantities should be indicated on the plans to ensure adequate amount of riprap is provided at storm sewer outfalls. 11. Manhole 101 should be replaced with a Pond Outlet Control Structure that conforms to the pond slope. A detail should be provided on the Site Details sheets. 12. Perimeter erosion control protection should be provided in all locations down gradient from proposed disturbed areas. Additional siltfence appears necessary on the west side of the North Ball Field and around the proposed stormwater pond. 13. Proposed sediment control logs should be curled upslope on the ends to direct runoff toward the center of the control measure. 14. Turf reinforcement mat should be provided on the pond's emergency overflow to limit potential for erosion during extreme events. If you have any questions or comments,please contact me to discuss. Sincerely, Bolton & Menk, Inc. ,6ZOte'ig Robert E.Bean,Jr.,P.E. Water Resources Engineer H:\ORNO\C13113299\Orono High School\OronoHS-Review-1-2017-11-21.docx Bolton&Menk is an equal opportunity employer.