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Home My WebLink AboutSW6191002_SuppEZ-2018-Version-2.1.1 2019_10/30/2019SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECTINFORMATION 1 Project Name FORT BRAGG SPECIAL OPERATIONS FACILITY 2 Project Area (ac) 2.59 3 Coastal Wetland Area ac 0 4 Surface Water Area ac 0 j 5 Is this proiect High or Low Density? High 6 Does this project use an off -site SCM? No CO_MPLIAN_CE_WITH 02H .1003(4) 7 Width of ve elated setbacks provided feet 2 8 Will the vegetated setback remain vegetated? Yes 9 Is BUA other that as listed in .1003 4 c-d out of the setback? No 10 Is streambank stabilization proposed on this project? No NUMBER AND TYPE OF SCMs: 11 Infiltration S stem 0 12 Bioretention Cell 1 13 Wet Pond 0 14 Stormwater Wetland 0 15 Permeable Pavement 0 16 ISand Filter 0 17 Rainwater Harvesting RWH 0 18 Green Roof 0 19 Level Spreader -Filter Strip LS-FS 0 20 Disconnected Impervious Surface (DIS) 0 21 Treatment Swale 0 22 Dry Pond 1 23 StormFilter 0 24 Silva Cell 0 25 Bayfilter 0 26 Filterra 0 FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: JERRY OBERHOLTZER PROJECT MANAGER 28 O anization: LOWE ENGINEERS 29 IStreet address: 990 HAMMOND DRIVE SUITE 900 30 City, State Zip: ATLANTA, GA 30328 31 Phone numbers : 770 857-8400 32 Email: JERRY.OBERHOLTZER@LOWEENGINEERS.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 of Designer 10-04-2019 Date DRAINAGE AREAS 1 Its this a high density project? YES 2 1 If so, number of drainage areas/SCMs 2 Is all/part of this project subject to previous rule 3 versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 1 j _ _2_ P 4 Type of SCM BIORETENTION CELL DETENTION POND 5 Total BUA in project s ft 49086 sf 32453 sf S 6permitting) New BUA on subdivided lots (subject to s ft 48192 sf 32453 sf 7permitting) New BUA outside of subdivided lots (subject to s 8 Offsite - total area (sq ft 9 Offsite BUA (sq ft 10 Breakdown of new BUA outside subdivided lots: Parking (sq ft 26341 sf 13225 sf f Sidewalk (sq ft 3352 sf 1155 sf Roof (sq ft 17090 sf 17090 sf Roadway s ft I� Future (sq ft Other, please specify in the comment box below (sg ft 1409 sf 870 sf 11 New infiltrating permeable pavement on subdivided lots (sq ft 12 New infiltrating permeable pavement outside of subdivided lots (sq ft 13permitting) Exisitng BUA that will remain (not subject to s ft 894 sf 113 sf 14 Existing BUA that is already permitted (sq ft 894 sf 113 sf 15 Existing BUA that will be removed (sq ft sf sf ♦ 16 Percent BUA 44% 57% 0% 17 Design storm inches 2 in 2 in 2 in 18 Design volume of SCM cu ft 8880 cf 6435 cf 2087 cf 19 Calculation method for design volume SCS SCS j SCS ADDITIONAL INFORMATION 20 Please use this space to provide any additional information about the drainage area(s): Other proposed BUAs include pads for water chillers and a transformer. 1 BIORETENTION CELL 1 IDrainage area number j 83 2 Design volume of SCM (cu ft) �� 6435 cf GENERAL MDC FROM 0 05 3 Is the SCM sized to treat the SW from all surfaces at build -outs No 4 Is the SCM located away from contaminated soils? Yes 5 lWhat 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)? I Yes 8 Is there an overflow or bypass for inflow volume in excess of the design volume? I 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)? 13 If the SCM is on a single family lot, does (will?) the plat comply with General MDC (10)? 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 licensed professional? Yes -- BIORETENTION CELL MDC FROM 02H .1052 SHWT elevation (fmsl) 224.50 18 19 Bottom of the bioretention cell (fmsl) 226.50 20 Ponding depth of the design storm (inches) 12 in 21 Surface area of the bioretention cell (square feet) 6435 sf 22 Design volume of the bioretention cell (cubic feet) 6435 cf 23 Is the bioretention cell used for peak attenuation? No 24 Depth of peak attenuation over planting surface (in) N/A 25 Height of peak attenuation outlet above the planting surface (in) N/A 26 Infiltration rate of the in situ soil (inch/hour) .4 in/hr 27 Diameter of the underdrain pipes (if applicable) 4 in 28 Does the design include Internal Water Storage (IWS)? Yes 29 if so, elevation of the top of the IWS (fmsl) 228 30 Elevation of the planting surface (fmsl) 229.5 31 What type of vegetation will be planted? (grass, trees/shrubs, other)? Grass 32 Media depth (inches) 30 in 33 Percentage of medium to coarse washed sand by volume 92% 34 Percentage of fines (silt and clay) by volume 4% 35 Percentage of organic matter by volume 3% 36 Type of organic material PINE BARK FINES 37 Phosphorus Index (P-Index) of media (unitless) <50 38 Will compaction be avoided during construction? Yes 39 Will cell be maintained to a one inch/hour standard? Yes 40 Depth of mulch, if applicable (inches) 2 in 41 Type of mulch, if applicable TRIPLE SHREDDED HARDWOOD 42 1 How many clean out pipes are being installed? 7 43 IType of pretreatment that will be used: RIPRAP ADDITIONAL INFORMATION Please use this space to provide any additional information about the 44 bioretention cell(s): Bioretention 3 7:57AM 10/4/2019 DRY POND 1 1Drainage area number 83 2 I Design volume of SCM (cu ft) 2087 cf E L DC 5 Is the SCM sized to treat the SW from all surfaces 3 at build -out? No 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? I 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)? 13 If the SCM is on a single family lot, does (will?) the plat comply with General MDC (10)? 14 Is there an O&M Agreement that complies with General MDC (11)? Yes 15 Is there an 0&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 licensed professional? Yes DRY POND MDC FROM 02H .1062 18 SHWT elevation (fmsl) 219 19 Elevation of the bottom of the dry pond (fmsl) 219.5 20 Distance from bottom to SHWT (feet) .5 ft 21 Elevation of the temporary pool during the design storm (feet) 220.8 ft 22 Ponding depth of the design storm (feet) .8 ft 23 Will the dry pond be uniformly graded to flow toward the outlet? Yes 24 Is a low flow channel being provided? No 25 Are the inlet(s) and outlet located in a manner that javoids short-circuiting? Yes 26 Will berms or baffles be provided to increase the flow path? No 27 lWhat method of pretreatment will be provided? RIPRAP 28 Diameter of drawdown orifice (in) 3 in 29 Drawdown time for the temporary pool (hours) 48 30 Does the pond minimize impacts to the receiving channel from the 1-yr, 24-hr storm? Yes 31 Is there a small permantent pool near the orifice to prevent clogging? Yes 32 Will the outlet be designed to prevent clogging? Yes 33 Are the dam and embankment planted in non- clumping turf grass? Yes 34 Species of turf that will be used on the dam and lembankment HYBRID BERMUDAGRAS S 35 Will trees and shrubs be prevented from growing on the dam and embankment? as ADDITIONAL _ �� —a — .T _ -_ .—z _---- INFORMATION 36 Please use this space to provide any additional information about the infiltration system(s): Dry Pond 4 7:57 AM 10/4/2019