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. . <br /> Subdivision Application 15-3770 <br /> 460 Orchazd Pazk Road <br /> Page 2 <br /> beneath the driveway to ensure it is not inundated during a 100 yeaz rainfall event. This work may <br /> require floodplain mitigarion. <br /> d. The City's Surface Water Management Plan identified this basin as PC-31, with a normal water <br /> level of 973.8,a 100 yeat high water level of 975.3,and a 15" sewer outlet. However,this <br /> infarmation was based on"desktop modeling"and daes not appear to match actual field data. <br /> Therefore,the applicant should submit hydraulic calculations establishing the lrigh water level far <br /> a 100 year rainfall event,incorporating a proposed outlet culvert and any filling and n;�itigation <br /> necessary to ensure the driveway is not inundated at any location. <br /> 1.7. The layout of ihe shared driveway iz�Outlot B should be revised to avoid conflict with the buffer for <br /> Wetland E. <br /> 1.8. The proposed driveways are extremely long. Driveway layouts should be reviewed by the Fire Cluef <br /> prior to final approval. <br /> 1.9. The applicant may be required to obtain Mannehaha Creek Watershed District(MCGVD}approval aud <br /> permitting for their Erosion Control,Wetland Protection,Waterbody Crossinga &Stxuctures,and <br /> Floodplain Alteration Ru1es. A copy of any approvals or permite required should be submitted prior to <br /> final approval. <br /> Preliminarv Plat <br /> 2.1. Outlot A appears to be designated for combination with the property aL 480 Orchard Park Road. If the <br /> intent is to provide addidonal septic site capacity for that property,it should be noted that the majority <br /> of the outlot is within the 50' wetland setback for septic systems. <br /> 2.2. At 90' wide,Outlot B is wider than typical oudots far shated driveways. The applicant si�ouId <br /> consider revising the shared driveway layout in order to reduce the outlot width and inr,rease lot areas. <br /> 2.3. Wetland setbacks for Wetlands B—E must be revised to 40' in order to provide 10' from established <br /> buffer widths per City requirements. <br /> 2.4. Wedand buffers and setbacks should be indicated around Wetlands C and D. <br /> 2.5. Protection fencing should be indicatcd azound proposed and alternaxe septic drain field sites to ensure <br /> they are not impacted during demolition or construction. <br /> Please let me know if you have any questions or need additional inforraation. <br /> Sincerely, <br /> BOLTON&MENK, INC. <br /> �d'C�� ���� <br /> Robert E.Bean,Jr.,P.E. <br /> Water Resources Fa�gineer <br />