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Home My WebLink AboutSW3211201_Supplement-EZ Form_20211206SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 Project Name Hemby Place 2 Project Area ac 43.82 3 Coastal Wetland Area ac 0 4 Surface Water Area ac 0 5 Is this pro'ect High or Low Density? High 6 1 Does this project use an off -site SCM? No COMPLIANCE WITH 02H .1003(4) 7 Width of ve etated setbacks provided feet 50 8 Will the vegetated setback remain vegetated? Yes 9 If BUA is proposed in the setback, does it meet NCAC 02H.1003 4 c-d ? NIA 10 Is streambank stabilization proposed on this project? No NUMBER AND TYPE OF SCMs: 11 Infiltration System 12 Bioretention Cell 13 Wet Pond 1 14 Stormwater Wetland 15 Permeable Pavement 16 Sand Filter 17 Rainwater Harvesting RWH 18 Green Roof 19 Level S reader -Filter Strip LS-FS 20 Disconnected Impervious Surface DIS 21 Treatment Swale 22 Dry Pond 23 StormFilter 24 25 LF11terra 26 FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title; Chris Bridges, P.E. 28 Organization: R. Joe Harris & Associates 29 Street address: 1186 Stonecrest Blvd. 30 City, State, Zip: Toga Ca , SC 29708 31 Phone numbers : 803 802-1799 32 Email: cbridges@rjoeharris.com Certification Statement: I certify, under penalty of law that this Supplement-EZ form and alt supporting information were prepared under my direction or supervision; that the information provided in the form is, to the best of my knowledge and belief, true, accurate, and complete; and that the engineering plans, specifications, operation and maintenance agreements and other supporting information are consistent with the information provided here. 0�es Al SEAL C-4168 0. l y . FR/NG & 5 Q� qR /S & PISS�G� riiiria�itir Q ofESSIO��'y%� w SEAL' N 043341 �z 0: � N op.. R•��P�\N SigN//� Date V 22/-Lo L I DRAINAGE AREAS 1 :Is this a high densitV promect? Yes 2 if so, number of drainage areaslSCMs 1 3 Does this prowect have low density areas? No 4 If so, number of low density drainage areas 0 5 Is all/part of this project subject to previous rule versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 1 4 Type of SCM Wet Pond 5 Total drainage area (sq ft 2,988,614 811.523 6 Onsite drainage area (sq ft 1,908,799 811.523 7 Offsite drainage area (sq ft 1,079,815 0 8 Total BUA in project (sq ft 346114 sf 304045 sf 9 New BUA on subdivided lots (subject to permitting)s ft 20fi266 sf 199722 sf 10permitting) New BUA not on subdivided lots (subject to s 108073 sf 104323 sf 11 Offsite BUA (sq ft 31775 sf NIA 12 Breakdown of new BUA not on subdivided lots: Parkin s (t) 0 sf 10805 sf 0 sf - Sidewalk (sq ft 8705 sf Roof (sq ft 0 sf 0 sf Roadway s ft 9726$ sf 95618 sf Future (sq ft 0 sf 0 sf 0 sf - Other, please specify in the comment box below (sq ft 0 sf 13 New infiltrating permeable pavement on subdivided lots (sq ft 0 sf 0 sf 14 Isubdivided New infiltrating permeable pavement not on lots (sq ft 0 sf 0 sf 15permitting) Existing BUA that will remain (not subject to s ft 0 sf 0 sf 16 Existing BUA that is already permitted (sq ft 0 sf 0 sf 17 Existing BUA that will be removed (sq ft 44,896 sf 35,087 sf 18 Percent BUA 11.58% 37.47% 19 Design storm inches 5.25 in 20 Design volume of SCM cu ft 303318 cf 21 i Calculation method for design volume SCS 24-hr Preci ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 drainage area(s): The design storm is based off the 10-yr storm event for this site. WET POND 1 Drainage area number 1 2 Minimum required treatment volume cu ft 45637 cf GENERAL MDC FROM 02H .1050 3 Is the SCM sized to treat the SW from all surfaces at build -out? Yes 4 Is the SCM located away from contaminated soils? Yes 5 What are the side slopes of the SCM H:V ? 2:1 6 Does the SCM have retaining walls, gabion walls or other engineered side slopes? No 7 Are the inlets, outlets, and receiving stream protected from erosion 10- ear storm)? Yes 8 Is there an overflow or bypass for inflow volume in excess of the design volume? No 9 What is the method for dewatering the SCM for maintenance? Pump referred 10 If applicable, will the SCM be cleaned out after construction? Yes 11 Does the maintenance access comply with General MDC 8 ? Yes 12 Does the drainage easement comply with General MDC 9 ? Yes 13 If the SCM is on a single family lot, does (will?) the plat comply with General MDC 10 ? NIA 14 Is there an O&M Agreement that complies with General MDC (11)? Yes 15 Is there an O&M Plan that complies with General MDC (12)? Yes 16 Does the SCM follow the device specific MDC? Yes 17 Was the SCM designed by an NC licensedprofessional? Yes WET POND MDC FROM 02H .1053 18 Sizing method used SAIDA 19 Has a sta elstora a table been provided in the calculations? Yes 20 Elevation of the excavated main pool depth (bottom of sediment removal) ffmsl 675.00 21 Elevation of the main pool bottom (top of sediment removal) (fmsl) 676.00 221 Elevation of the bottom of the vegetated shelf fmsl 682.00 23 Elevation of the permanenl pool fmsl 682-00 683.00 683.50 24 Elevation of the top of the vegetated shelf fmsl 25 Elevation of the temporary col fmsl 26 Surface area of the main permanent pool (squarefeet _ 20,503 sf 27 Volume of the main permanent pool cubic feet 100359 cf 28 Average depth of the main pool feet 4.89 ft 29 Avera a depth euation used Equation 2 30 If using equation 3, main Pool perimeter,(feet) NIA 31 If using equation 3, width of submerged veg. shelf feet NIA 32 Volume of the foreba cubic feet 17215 cf 33 Is this 15-20% of the volume in the main ool? Yes 34 Clean -out depth for foreba inches 72 in 35 Desi n volume of SCM cu ft 303318 cf 36 Is the outlet an orifice or a weir? Weir 37 If orifice, orifice diameter inches N/A 38 if weir, weir height inches 12 in 39 if weir, weir length inches 24 in 40 Drawdown time for the temporary pool (days) 3.02 41 Are the inlet(s) and outlet located in a manner that avoids short- circuiting? Yes 42 Are berms or baffles provided to improve the flowpath? Yes 43 Depth of forebav at entrance inches 84 in 44 Depth of forebay at exit inches 76.2 in 45 Does water flow out of the forebay in a non -erosive manner? Yes 46 Width of the vegetated shelf feet 6 ft 47 Slope of vegetated shelf H:V 6:1 48 Does the orifice drawdown from below the top surface of the permanentpool? No 49 Does the pond minimize impacts to the receiving channel from the 1- r 24-hr storm? Yes 50 Are fountains proposed? (If Y, please provide documentation that MDC 3 is met. No 51 Is a trash rack or other device provided to protect the cutlet system? Yes 52 Are the dam and embankment planted in non -clumping turf grass? Yes 53 Species of turf that will be used on the dam and embankment See info below 541 Hasa planting plan been provided for the vegetated shelf? Yes ADDITIONAL INFORMATION 55 Please use this space to provide any additional information about the wet pond(s): The dam & embankment will use the ChadottelMecklenburg FACW Meadow seed mix. The vegitation shelf uses several different turfs as well. All of this can be seen in more detail on the BMP planting plan (C4.03).