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Home My WebLink AboutSW6221006_Supplement-EZ Form_20230531SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 1Project Name _. . . _........_. _. _ ................. 2 1 Project Area (ac) CCBCC-Fayetteville .......... - - . . . 13.7 3 Coastal Wetland Area (ac) 0 4 Surface Water Area ac 0 5 Is this project High or Low Density? High 6 Does this project use an off -site SCM? No COMPLIANCE WITH 02H .1003(4) 7 Width of vegetated setbacks provided feet 30 8 Will the vegetated setback remain vegetated? WA 9 If BUA is proposed in the setback, does it meet NCAC 02H.1003(4)(c-d)? N/A 10 Is streambank stabilization proposed on this project? NUMBER AND TYPE OF SCMs: 11 Infiltration System 12 Bioretention Cell 13 _ Wet Pond 14 Stormwater Wetland 15 1 Permeable Pavement 16 Sand Filter 17 Rainwater Harvesting RWH 18 Green Roof 19 Level Spreader -Filter Strip LS-FS 20 Disconnected Impervious Surface DIS 21 1 Treatment Swale 22 Dry Pond 23 StormFilter 24 Silva Cell 25 Bayfilter 26 _ Filterra 2 FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: Ethan HartP.E. - Civil Engineer 28 _ Organization: Fitts and Goodwin Inc. 29 Street address: 120 Corporate Blvd. 30 City,State Zip: West Columbia SC 29169 31 Phone numbers : _ 803 331-2991 32 Email: ehart@strategisse.com Certification Statement: I certify, under penalty of law that this Supplement-EZ form and all 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. C A R O� y, � .......... SS/o d SEAL 051479 401NEE� ° rgnature of Desi er Date 513 OZ9 9 _ i ►FAJ 1:4VAJZ 1 Is this a high density ro ect?�_ Yes 2 m If soy„number of drainage areas/SCMs 2 3 Does this pro'e� of have low densi,_ areas? No 4 If so number of low density, draina a aareas _ 0 Is all%part of this project subject to previous rule 5 versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 4 T e of SCM _ 1 2 Filterra Filterra 5 Total drainage area (sq ft 596772 22651 22651 6 Onsite drainage area sq ft596772 22651 22651 7 Offsite drainage area s ft� 0 0_ w 0 8 Total BUA in , ro'ect sqjft _ 325831 sf 21344 sf _ 21344 sf M New BUA on subdivided lots (subject to permitting) 10 New BUA not on subdivided lots (subject to permitting) (sf) _ _ 31798 sf 11 OffsiteBUA�s 12 Breakdown of new BUA not on subdivided lots: Parkin _ . _ 31798 sf Roof s9 :g..__-........_ Roadwa s ft _ Futurej�5 _ - Other, please specify in the comment box below s ft 13 New infiltrating permeable pavement on� subdivided lots s(q ft_ 14 M New infiltrating permeable pavement not on subdivided lotsJscft1 15 Existing BUA that will remain (not subject to ermittin (N ft)_ 294033 sf 21344 sf 21344 sf 16 Existin BUA that is alread ermitted sq ftl _ __ �_ 17 Existing BU,,A that will be removed,( _ 18 Percent BUA 55% 94% 94% 19� sign storm inches) 1.0 in 1.0 in 20 Design volume of SCM cu ft 1407 cf 1407 cf 21 Calculation method for design volume ADDITIONAL INFORMATION Discrete Discrete 22� ldralnage Please use this space to provide any additional information about the areas Expansion to existing site results in a net increase of 0.73-ac (31,798-sf) impervious area. Runoff from an existing 1-ac parking lot draining to the site's existing basin is being treated by a two (2) - Filterra bioretention SCMs in lieu of modifications to the existing basin. FILTERRA BIORETENTION 1 Drainage area number 1 2 2 Minimum required treatment volume (cu ft) 1407 1407 GENERAL MDC FROM 02H .1050 3Is the SCM sized to treat the SW from all surfaces at build -out? Yes Yes 4 Is the SCM located away from contaminated soils?_ Yes Yes 5 What are the side slopes of the SCM (H_ V) 6 Does the SCM have retaining walls, gabion walls or other engineered side slopes? 7 Are the inlets, outlets, and receiving stream protected from erosion 10- ear storm)? Yes Yes 8 Is there an overflow or bypass for inflow volume in excess of the design volume? Yes Yes 9 What is the method for dewatering the SCM for maintenance? 10 If applicable, will the SCM be cleaned out after construction? Yes Yes 11 Does the maintenance access comply with General MDC 8 ? Yes Yes _ 12 Does the drainage easement comply with General MDC 9)? Yes Yes 13 If the SCM is on a single family lot, does (will?) the plat comply with General MDC 10 ? N/A N/A 14 Is there an O&M Agreement that complies with General MDC (11)? Yes Yes 15 Is there an O&M Plan that complies with General MDC (12)? Yes Yes 161 Does the SCM follow the devicespecific MDC? Yes Yes 17 Was the SCM designed by an NC licensedprofessional? Yes BIORETENTION MDC FROM THE STORMWATER DESIGN MANUAL Type of pretreatment that will be used Rip Rap Dissipation De th of storage above the filter media surface (in) 12 in Yes FILTERRA Rip Rap 7 __Dissipation 18 19 12 in _.. 20 Surface area of the Filterra Bioretention system (sft _ _- 91 sf 91 21 Method of flow distribution over the media Disperse Disperse 221 Infiltration rate of engineered media inch/hour) 140 in/hr 140 in/hr 231 Diameter of the underdrain pipes (if applicable) 6 in 6 in 24 Does the design include Internal Water Storage IWS ? No No 25 if so, elevation of the top of the IWS (fmsl) N/A N/A 94.7 26 Elevation of the planting surface fmsl 94.5 Eastern Redbud 21 in 27 Species of trees that will be planted Eastern Redbud 28 Media depth inches 21 in 29 Number of clean out pipes 1 each 1 30 Will maintenance be performed per the Filterra Operations and Yes Yes Maintenance Manual? ADDITIONAL INFORMATION 31 Please use this space to provide any additional information about the Filterra Units :