Franklin Medical Center - Signed Supplement_Wet Basin

WET POND1 Drainage area number1 Total coastal wetlands area (sq ft) - Parking / driveway (sq ft)20841 sfTotal surface water area (sq ft) - Sidewalk (sq ft)3941 sfTotal drainage area (sq ft)119331 sf - Roof (sq ft)14605 sfBUA associated with existing development (sq ft)2802 sf - Roadway (sq ft)27282 sfProposed new BUA (sq ft)63867 sf - Other, please specify in the comment box below (sq ft) Percent BUA of drainage area56%Total BUA (sq ft)66669 sfDesign rainfall depth (in)1.0 inMinimum volume required (cu ft)13392 cfDesign volume of SCM (cu ft)13858 cf#1 Is the SCM sized to treat the SW from all surfaces at build-out?Yes#7 If applicable, with the SCM be cleaned out after construction?Yes#2 Is the SCM located on or near contaminated soils?No#8 Does the mainetenance access comply with General MDC (8)?Yes#3 What are the side slopes of the SCM (H:V)?3:1#9 Does the drainage easement comply with General MDC (9)?Yes#3 Does the SCM have retaining walls, gabion walls or other engineered side slopes? No#10 If the SCM is on a single family lot, does the plat comply with General MDC (10)?#4 Are the inlets, outlets, and receiving stream protected from erosion (10-year storm)? Yes#11 Is there an O&M Agreement that complies with General MDC (11)?Yes#5 Is there a a bypass for flows in excess of the design flow?Yes#12 Is there an O&M Plan that complies with General MDC (12)?#6 What is the method for dewatering the SCM for maintenance?Pump (preferred)#13 Was the SCM designed by an NC licensed professional?Yes#1 Method usedHRT#6 Width of the vegetated shelf (feet)6 ft#1 Surface area of the main permanent pool (square feet)4123 sf#6 Location of vegetated shelfAbove Normal Pool#1 Volume of the main permanent pool (cubic feet)13858 cf#6 Elevation of top of shelf (fmsl)276 ft#2 Average depth of the main pool (feet)5 ft #6 Elevation of bottom of shelf (fmsl)275 ft#2 Was the vegetated shelf included in the calculation of average depth? No #6 Slope of vegetated shelf (H:V)6:1#2 Elevation of the bottom of the permanent pool (fmsl)270 ft #7 Diameter of drawdown orifice (inches).6 in#2 Elevation of the top of the permanent pool (fmsl)275 ft #7 Drawdown time for the temporary pool (hours)72 hrs#2 Elevation of the top of the temporary pool (fmsl)276 ft #7 Does the orifice drawdown from below the top surface of the permanent pool?Yes#3 Depth provided for sediment storage (inches)6 in#8 Does the pond minimize impacts to the receiving channel from the 1-yr, 24-hr storm? Yes#4 Are the inlet(s) and outlet located in a manner that avoids short-circuiting?Yes #9 Are fountains proposed?No#9 If yes, is documentation provided per Wet Pond MDC (9)?#10 Is a trash rack or other device provided to protect the outlet system? Yes#5 Volume of the forebay (cubic feet)2331#11 Are the dam and embankment planted in non-clumping turf grass?Yes#5 Is this 15-20% of the volume in the main pool?Yes#11 Species of turf that will be used on the dam and embankment Bonanza Tall Fescue#5 Depth of forebay at entrance (inches)39 in#11 Describe the planting plan for the vegetated shelf:#5 Depth of forebay at exit (inches)39 in#5 Does water flow out of the forebay in a non-erosive manner?Yes#5 Clean-out depth for forebay (inches)6 in#5 Will the forebay be cleaned out when the depth is reduced to less than the above? YesFranklin Medical Center - 20 Bed Add.Break down of BUA in the drainage area (both new and existing):COMPLIANCE WITH THE APPLICABLE STORMWATER PROGRAMStormwater program(s) that apply (please specify):WET POND MDC FROM 02H .1053#4 Describe any measures, such as berms or baffles, that will be taken to improve the flow path:x184 Swamp Milkweed, x184 Scarlet Rose Mallow, x184 Halberdleaf Rose MallowADDITIONAL INFORMATIONPlease use this space to provide any additional information about this wet pond that you think is relevant to the review:GENERAL MDC FROM 02H .1050THE DRAINAGE AREAWet Pond22:57 PM 10/18/2018