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Home My WebLink AboutSW6220603_Supplement-EZ Form_20220711SUPPLEMENT-EZ COVER PAGE FORMS LOADED .PROJECT INFORMATION 1 Project Name Harnett Self Storage 2 Project Area (ac) 7.5 ----` 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? Yes COMPLIANCE 7 8 WITH 02H .1003(4) Width of vegetated setbacks provided (feet) � 50 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)? N/A 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) I 18 " Green Roof 19 Level Spreader -Filter Strip (LS-FS) 20 Disconnected Impervious Surface (DIS) 21 Treatment Swale 22 Dry Pond 23 IStormFilter 24 Silva Ce11 25 Bayfiiter 26 Fiiterra rORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: I Jarrod E. Hilliard, PE, CFM, Owner 28 Organization: Hilliard Engineering, PLLC 29 Street address: 3417 Winterwind Circle 30 City, State, Zip_ Sanford, NC 27330 31 Phone number(s): 919-362-2834 32 1 Email: _ jhilliard@hilliardengineering-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. Signature oh5esigner DRAINAGE AREAS 1 Is this a high density project? Yes__ -� 2 _ It so, number of drainage areas/SCMs 1 3 Does this project have low density areas_? No 4 If so, number of low density drainage areas 0 5 aversions? Is all/part of this project subject to previous rule —_ No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 4y wet pond 1,169,493 k 4 5 Type of SCM JTotal drainage area (sq ft) 6 [Onsite drainage area (sq ft) EI 1,169,493 7 Offsite drainage area (sq ft) 8 9 Total BUA in project (sq ft) New BUA on subdivided lots (subject to permitting) (sq ft) — 640933 sf 85658 sf 10 New BUA not on subdivided lots (subject to 1 permitting) (sf) 555275 sf 11 Offsite BUA (sq ft) 12 Breakdown of new BUA not on subdivided lots: - Parking sq ft) _ 299520 sf� - Sidewalk (sq ft) 16234 sf - Roof (sq ft) 195961 sf - Roadwa (sq ft) - Future (sq ft) 43530 sf - Other, please specify in the comment box below (sq ft) 13 New infiltrating permeable pavement on subdivided lots (sq ft) 14 New infiltrating permeable pavement not on subdivided lots (sq ft) 15 Existing BUA that will remain (not subject to permitting) 16 Existing BUA that is already permitted (sq ft) 296744 sf 117 Existing BUA that will be removed (sq ft ' 18 Percent BUA 55% 19 Design storm (inches) 1.0 in e 20 Design volume of SCM (cu ft) 67707 cf 21 [Calculation method for design volume simple ADDITIONAL INFORMATION — Please use this space to provide any additional information about the 22 drainage area(s): i OFF -SITE SCM r AINAGE AREA rainage area number for this projectaster permit number SW6100804 rainage area number from the master permit 1 4 Lot or outparcel number 5 BUA allocated by Master Permit INFORMATION ABOUT THE OFF -SITE SCM 6 Type of off -site SCM 1 7 jAvailable treatment capacity in the off -site SCM (cu ft) 8 Have deed restrictions limiting the BUA on the site been recorded? 9 Has an Engineer's Certification for the off_ -site SCM been submitted to DEQ 10 Are there any Notices of Violation for the off -site system? 11 Has the off -site SCM been maintained in accordance with its O&M Plan? Residential Tract 779288 sf Wet Pond 67707 cf No No No No 12 Will the collection system be maintained in its design state and kept clean? Yes ADDITIONAL INFORMATION loom f'113 i Please use this space to provide any additional information about the off -site SCM(s). WET POND 1 Drainage area number 1 2 Minimum required treatm_ ent volume (cu ft) 64981 cf GENERA! MDC FROM 02H 10S0 3 Is the SCI 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)? 3:1 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-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 (preferred) 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)? N/A 14 Is there an O&M Agreement that complies with General MDC 01)? Yes 151 Is there an O&M Plan that complies with General MDC (12)? Yes 6 F17IWa, Daes the SCM follow the device specific MDC? Yes the SCM designed by an NC licensed rofessional? Yes !Wt1 PUIND MDC: FROM 07H .1nS3 18 Sizing method used SA/DA 19 Has a stage/storage table been provided in the calculations? Yes 20 Elevation of the excavated main pool depth (bottom of sediment removal) (fmsl) _ 427.00 21 Elevation of the main pool bottom (top of sediment removal) (fmsl) 428.00 22 Elevation of the bottom of the vegetated shelf (fmsl) 430.50 23 Elevation of the permanent pool (fmsi) 431,00 241 Elevation of the top of the vegetated shelf (fmsl) 431.50 251 Elevation of the temporary pool (fmsl) 432.00 261 Surface area of the main permanent pool (square feet) 63277 27 1 Volume of the main permanent pool (cubic feet) 163571 cf 28 1 Average depth of the main pool (feet) 3.30 ft 29 Average depth equation used Equation 2 301 if using equation 3, main pool perimeter (feet) 31 If using equation 3, width of submerged veg. shelf (feet) 32 Volume of the forebay (cubic feet) 33939 cf 33 Is this 15-20% of the volume in the main pool? Yes 34 Clean -out depth for forebay (inches) 12 in 35 Design volume of SCM (cu ft) 67707 of 36 Is the outlet an orifice or a weir? Orifice 371 If orifice, orifice diameter (inches) 4 in 381 If weir, weir height (inches) 391 If weir, weir length (inches) 40 Drawdown time for the temporary pool (days) 4.07 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 flow path? No 43 Depth of forebay at entrance (inches) 24 in 44 Depth of forebay at exit (inches) 24 in 45 Does water flow out of the forebay in a non -erosive manner? Yes 46 Width of the vegetated shelf (feet) loft 47 Slope of vegetated shelf (H:V) 10:1 48 Does the orifice drawdown from below the top surface of the permanent 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 Are the dam and embankment planted in non -clumping turf grass? No 53 Species of turf that will be used on the dam and embankment 54! Has a planfing plan been provided for the vegetated shelf? I No I ZONAL INFORMATION sE Please use this space to provide any additional information about the Wet Pond 1 2:52 PM 6/11/2022