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BC n. .T•C) J a. NA NJ . , I N.+=.. <br /> ) Consulting Engineers&Surveyors <br /> 2638 Shadow Lane,Suite 200•Chaska,MN 55318-1172 <br /> Phone(952)448,8838•Fax(952)448-8805 <br /> _ www boiton-menkcom <br /> February 26,2016 <br /> City of Orono <br /> Ann: Christine Mattson <br /> 2750 Kelley Parkway <br /> Orono,1101 55356 <br /> RE: Building Permit 2016-00117 <br /> 470 Orchard Park Road <br /> Engineering Review#1 <br /> Dear Christine: <br /> As requested,we have completed an engineering review of the documents submitted for the above <br /> referenced project. We offer the following comments for your consideration: <br /> 1. Perimeter erosion control measures(i.e.siltfence,rock entrance)and protection fencing around <br /> septic sites should be installed by the Contractor and inspected by the City prior to any other work. <br /> Contractor must provide minimum 24 hour notice prior to inspection. <br /> 2. Work in public right-of-way should be coordinated with the City. Contractor should provide <br /> minimum 24 hour notice prior to work. <br /> 3. Rain gardens and infiltration trenches should not be installed until upstream areas are permanently <br /> stabilized. <br /> 4. Biolog ditch checks should be installed on the swale south of the proposed house leading to rain <br /> garden#1 after grading is complete. <br /> 5. Erosion control blanket should be installed on 3:1 slopes after grading is complete. <br /> 6. Turf reinforcement mat should be installed on rain garden weir outlets after rain gardens are <br /> constructed. <br /> 7. Riprap should be installed on the downstream end of the proposed culvert on the northwest corner <br /> of the large wetland. <br /> 8. Trashguards should be installed on all storm sewer aprons. <br /> 9. Proposed HDPE culverts draining to rain garden#2 under the proposed driveway should be <br /> installed as RCP. Lack of cover may result in crushing of HDPE pipe,and fluctuating water levels <br /> in the rain garden may result in floating of the HDPE pipe ends. <br /> Please let me know if you have any questions or need additional information. <br /> Sincerely, <br /> BOLTONLG / <br /> &MENK, <br /> n / <br /> Robert E.Bean,Jr.,P.E. <br /> Water Resources Engineer <br />