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Home My WebLink AboutSW6210303_EZ Supplement Form 3_20210329SUPPLEMENT-EZ COVER PAGE r— FORMS LOADED PROJECT WFORKATION Project Name Watson Ridge 2 F1 Proiect Area (ac) 39.625 3 3 Coastal Welland Area (ac) - 4 j Surface Water Area (ac) 0.429 5 Is this project High or Low Density? High 6 Does this project use an off -site SCIVI? No COMPLIANCE WITH 0214.1 7 Width.of vegetated setbacks provided (feet) 30 8 Will the vegetated setback remain vegetated? Yes 9 If BUA is proposed in the setback, does it meet NCAC 02H. 1 003(4)(c-d)? No 10 Is streambank stabilization proposed on this project? No ;NumsER AND rim OF scia: 11 Infiltration System 2 12 Bioretention Cell 0 13 Wet Pond 14 Stormwater Wetland 15 Permeable Pavement 0 16 Sand Filter 0 17 Rainwater Harvesting (RWH) a 18 Green Roof 0 19 Level Spreader -Filter Strip (LS-FS) 0 20 Disconnected Impervious Surface (DIS) 0 21 Treatment Swale 0 22 J Dry Pond 0 23 IStormFilter 0 Silva 11 0 L24 2 .5 Bavfilter 0 26 Filterra 0 I FORMS LOADED 27 Name and Title: Ztt Lowder, PE 28 Organization� Triaggle Site Design, PLLC 29 Street address: 40D4 Barrett Drive, Suite 101 30 City, State, Zip: Raleigh, NC 27609 31 Phone number(s): 919-553-6570 32 �Email: mlowder0triangleskedesign,00m Caaffiamen S**mwt I 09r*, UndW penalty of law eW this Supplement-EZ form and all supponft Infomwdon wwa pirspared urdw nly diraotion or supertision; tho to information provkled in ft form is. to the best of rny knaMefte and b@W, bve, a0curaft, aW ompkft; and that to en~ng plans, sP9CftffbW6. OPOratim and MainWAnce agreisimenta and other supporting inknnation ate consishwit with the informaton provk1sid heire. , 10 IC !Erll 3 4 z �zA—� I Signature of Designer DRAINAGE AREAS 1 Is this a hiqh density project? Yes 2 If so, number of drainage areas/SCMs 3 Does this project have low density areas? -3 No 4 If so, number of low density drainage areas 5 Is allipart of this project subject to previous rule versions? —0 No LORMS LOADED DRAINAGE AREA IINFORMATION En&e 8ft 1 2 3 4 Type of SC M - Infiltration Basin Infiltration Basin Wet Pond 5 Total drainage area (sq ft) 1010204 262994 425090 322120 6 Onsile drainage area (sq ft) 987169 239959 425090 322120 7 Offsile drainage area (sq ft) 23035 23035 8 Total BUA in project (sq ft) 230951 73115 sf M38 sf 58298sf 9 New BUA on subdivided lots (subject to permitting) (sq ft) 10 New BUA not on subdivided lots (subject to permitting) (s� 11 Offsite BLIA (sq ft) 7686 7686sf 12 Breakdown of new BUA not an subdivided lots: Parking (sq ft) Sidewalk (sq ft) Roof (sq ft) 168000 48000sf 720DDsf 48000sf Roadway (sq ft) 55265 17429sf 27538 sf 10298sf Future (sq ft) Oth r, please specify in the comment box below ( q ft) 13 New infiltrating permeable pavement on subdivided lots (sq fl) 14 New infiltrating permeable pavement not an subdivided lots (sq ft) 15 Existing BUA that will remain (not subject to ptrmitting) (sq ft) 16 Existing BUA that is already permitted (sq ft) 17 _ Existing BUA that will be removed (sq ft) 18 Percent BIJA 28% 23% 18% 19 1 Desig n storm (inches) 1.0 in 1.0 in 1.0 in 20 Desiq n vol ume of SC M (cu 6579 cf 9237 ef 5715 ef 21 Calculation method for design volume Simple Method Simple Method Simple Math Id ADDrrtONAL INFORMATION 22 � Please use this space to provide any additional information about the drainage area(s): Infiltration Basin #1 - there is offshe drainage area from the Lee County portion of the overall development. L----- - WETPOND I �Dr�ainae aree'a number 1 3 2 M'njm'm r� ired treatment volume (cu ft� 5715 cf GENE MDC FROM C2H.1= 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'7 Yes 5 What are the side slopes Ef MESCM H 1 9 61 Does the SCM have retaining walls, gabion walls or other engineered side slop�s? No 7 .-- Are the inlets. outlets, and receiving stream protected from erosion (1 0-year storm)? Yes 8 Is there an overflow or bypass for inflow volume in excess of the design volume? Yes 9 What is the method for dewatering the SCM for maintenance? Pump (prefea!eqL 1 0� If applicable, will the SCM be cleaned out after construction? Yes —111, Does the maintenan�t�� 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 comp�ywith Genera I MDC It 0)? NIA 14 Is there an O&M Agreement that complieswrth General MDC (11)? Yes 15 Is there an O&M Plan that complies with General M DC (12)'? Yes 16 Does the SC M follow the device specific MDC? Yes 17,Was the S ned by an NC licensed professional? Yes 2MIX MMM JM 18 Sizing method used SAIDA 19 Has a stagelstorage table been provided in the calculations? Yes 20 — Elevation of the excavated main pool depth (bcttom of sediment removal) (firnsl) 324.00 21 Elevation of the main pool bottom (top of sediment removal) (fmsl) $25.00 22 Elevation of the bottom of the vegetated she1 (,fmsi) 328.50 23 Bevation of the permanent pool (frnsl) 329.00 24 Elevation of the top of the.vegetated shelf (fmsl) 329.50 25 Elevation of the temporary pool �frnsl) 330.10 2 u a. _ area of the main permanent pool (square feet) 3155 27 Voiume of the main permanent pool (cubic feet) 8003 cf 28 Ave(age depth of the main pool (feet) 3.11 ft 29 Average depth equation used Equation 3 * If using equation 3, main pool perimeter (feet) 220.0 ft 31 � If using equation 3, width of submerged veg. shelf (feet) 3.0 ft 32Volume of the forebay (cubic feet) 1496 of 3 � s this 15-20% of the volume in the main pool'? Yes 34 1 Clean -out depth for forebay �inches) 24 in 351 Design volume of SCM (cu ft) 5715 ef 36 1 a the outlet an orifice or a weir? Orifice 37 If orifire, orifice diameter (inches) 1.25 in 38 If weir, weir height (inches) --iif —wesr, 39 weir �ength (inches) 40 Drawdo in time for the 1�mporary pool (days) 2.06 41 Are the inlet(s) and outlet located in a manner that avoids shorl- circuitin92.. Yes 42 1 Are berms or baffies provided to improve the flow path? Yes 431 Depth of forebay at entrance (inches) 36 in 441 Depth of forebay at exit (inches) 30 in 4 51 Does water flow out of the forebay in a non-eros;ve manner.? Yes 46 Width of the. vegetated shelf (feet) 6 ft 47 lo e of vegetated shelf (H:V) 6:1 48 �perrnanent Does the orifice drawdown from below the top surface of the pool? Yes 49 Does the pond minimize impacts to the receiving channel from the 1 - yr, 24-hr storm? Yes 50 — Are fountains proposed? (if Y, please provide documentation that MDC(9) is met.) No 51 Is a trash rack or other device provided to protect the outlet system? Yes 52 1 Are the dam and embankment planted i n non-clum ping turf grass? Yes 531 Species of turf that will be used on the dam and embankment Hybdd Bermuda 541 Has a planting plan been provided for the vegetated shelf'.) Yes ADDITIK)MAL IWORMATM 55 iwet Please use this space to provide any additionW information about the pond(s) I Wet Pond 2:35 PM 3/4/2021