06-25-2018 Council Meeting Packet

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Updated TP removals will be included in the updated SWMP 11.The applicant shall verify HWLs for ponds. In some instances, they differ between the HydroCAD modeling and the plans. HWLs confirmed. The applicant shall revise the HWLs on the plans to match HydroCAD modeling. Plans are updated. Applicant shall clarify why two different 100-yr HWL and 10-day Snowmelt elevations are shown on the plans. 12.The applicant shall clarify the intent of the low area on Outlot D. If intended to be a stormwater pond, please include it in modeling. Node added 13.The applicant shall revise the ACD number it varies throughout the Stormwater Management Plan and SWPPP narratives. Comment Noted and ditch ID consistent in report Addressed in Stormwater Management Plan. Applicant shall update the SWPPP. SWPPP updated per the SWMP. 14.The applicant shall verify the lot lines on Lot 12 Block 4, Lot 4 Block 1, and Lot 5 Block 1. It appears the structures may encroach on the drainage and utility easements. Plan updated. The applicant shall verify the lot lines on Lot 24 Block 7. It appears the structure may encroach on the drainage and utility easement. Lot lines revised in this area as well as pad locations. 15.The applicant shall include the bottom elevation of the infiltration basin on the grading plans. Elevations added. Applicant shall verify the bottom elevation, as it differs between HydroCAD model, plans, and Appendix C. Verify the culvert outlet elevation; outlet should be above the exfiltration elevation. As a note: planting medium is not necessary below the bottom of the infiltration basin. The infiltration is not intended to provide above-ground retention to prevent oversaturating the back yards of the adjacent lots. The area is a flat infiltration swale area. The plan and HydroCAD Model now show the outlet elevation equal to the infiltration basin bottom. Note that with this design, infiltration volume credit cannot be claimed for IB10 and the SWMP must be updated. Volume of infiltration is the ponded volume (volume from basin bottom to the outlet elevation). 16.The applicant shall verify the retention volume calculation for Pond 400 in Appendix C as there appears to be an error. The volumes are correct. 17.If needed, the opportunity may exist to maximize infiltration at the infiltration basin by constructing the basin to minimize the separation between the bottom of the basin and the water table. The basin needs minimum 3 feet separation from the water table and cannot be lowered. 18.The applicant shall verify that the HWL of the Infiltration Basin is 2.0 feet below the low entry elevations of surrounding buildings. Separation requirement is met 19.The applicant shall display and label emergency overflows with spot elevations and drainage arrows at all ponds and sags, specifically at the intersection of Street A and Street C and at the cul-de-sac of Street C. EOF’s added. 20. The applicant shall confirm that there is a 10-ft. setback between the HWL of the