Laserfiche WebLink
Name: Corrin Wendell <br />Date: December 14, 2021 <br />Page: 4 <br /> <br />H:\LTCANADA_CI_MN\0N1123140\2_Preliminary\C_Reports\Preliminary-Final Plat Review 1\Engineering Staff Review 1.docx <br /> <br />24. There is a symbol/block at the SE quadrant of Labore Road that appears to be connected to the <br />watermain. Is this a proposed hydrant? If so, provide more detail. <br />25. Include provisions in the plans for expected soil corrections along the off-street sanitary sewer <br />installation. The geotechnical report recommends removal of all peat & organic soils below and <br />above the sanitary sewer. <br /> <br />STORM SEWER <br />1. Include MH post markers should be specified for off-street manholes <br />2. Increase quantity of riprap at FES 1 and FES 10 to 20 CY each <br />3. Show watermain and sanitary sewer crossings in profile view. It appears these crossings result in <br />the flat storm sewer between CBMH 3 and CBMH 5. Increase pipe slope to 0.5%. <br />4. Modify wet pond / filtration basin design to include a berm between the two BMP’s, with a 12- <br />inch equalizer pipe between the two. <br />5. Specify draintile sizes in the plans. <br />6. Include 2 additional, parallel draintile segments within filtration basin (3 total). <br />7. Include a cleanout at the ends of street draintile runs. <br /> <br />STORMWATER MANAGEMENT <br />8. Rate Control – proposed runoff rates shall be less than the existing runoff rates. <br />a The proposed runoff rates are less than the existing runoff rates. <br />9. Volume Control – treatment of 1.1” over the new or reconstructed impervious is required. Filtration <br />is proposed due to soil conditions. RWMWD allows volume abstraction through filtration at a 55% <br />credit. <br />a Required Volume = 12,342 CF <br />b Provided Volume = 12,810 CF <br />10. Water Quality Treatment – 90% reduction in total suspended solids must be provided. <br />a The P8 model shows a reduction of 91%. <br />11. Outlet Structure – Pond #1: Draintile elevation of 870.0’ does not match Sheet 6 Storm Sewer Plan <br />elevation of 869.0’ <br />12. A filtration bench is shown in the wet sedimentation basin. The elevation of the filtration bench <br />appears to be below the NWL. Please describe how the filtration bench will function while <br />maintaining the NWL. <br />13. HydroCAD – Pond #1: device #6 invert elevation does not match sand filter bottom elevation in <br />the plan set. <br />14. Freeboard and flood control requirements are met.