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Home My WebLink AboutSW6191006_Supplement-EZ Form_20200706SUPPLEMENT-EZ COVER PAGE LOAD SUPPLEMENT FORMS 1 Project Name Fort Bragg SOF 2 Project Area (ac) 3.98 Acres (Project Area Within Fort Bragg) 3 Coastal Wetland Area (ac) 0 4 Surface Water Area (ac) 0.51 5 Is this project High or Low Density? High 6 Does this project use an off-site SCM? No 7 Width of vegetated setbacks provided (feet) 30 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 11 Infiltration System 2 12 Bioretention Cell 0 13 Wet Pond 0 14 Stormwater Wetland 0 15 Permeable Pavement 0 16 Sand 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 0 23 StormFilter 0 24 Silva Cell 0 25 Bayfilter 0 26 Filterra 1 LOAD SUPPLEMENT FORMS 27 Name and Title:Kenneth M. Jenkins, II (Professional Engineer) 28 Organization:Landtech Resources, Inc. 29 Street address:3925 Midlands Road 30 City, State, Zip:Williamsburg, Virginia 23188 31 Phone number(s):757-565-1677 32 Email:N/A Certification Statement: Designer ______________________________________________ Signature of Designer ______________________________________________ Date 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. PROJECT INFORMATION NUMBER AND TYPE OF SCMs: DESIGNER CERTIFICATION COMPLIANCE WITH 02H .1003(4) Seal DRAINAGE AREAS 1 Is this a high density project?Yes 2 If so, number of drainage areas/SCMs 3 3 Is all/part of this project subject to previous rule versions?No CLICK TO LOAD FORM Entire Site 1234 4Type of SCM Infiltration Basin Infiltration Basin Filterra 5 Total BUA in project (sq ft)83250 sf 44870 sf 56876 sf 5062 sf 6 New BUA on subdivided lots (subject to permitting) (sq ft) 7 New BUA outside of subdivided lots (subject to permitting) (sf)83250 sf 44870 sf 33318 sf 5062 sf 8 Offsite - total area (sq ft)23558 sf 9 Offsite BUA (sq ft)23558 sf 10 Breakdown of new BUA outside subdivided lots: - Parking (sq ft)1633 sf 394 sf 814 sf 425 sf - Sidewalk (sq ft)4544 sf 2633 sf 1742 sf 169 sf - Roof (sq ft)46180 sf 28721 sf 17459 sf - Roadway (sq ft)30793 sf 13072 sf 13253 sf 4468 sf - Future (sq ft) - Other, please specify in the comment box below (sq ft) 100 sf 50 sf 50 sf 11 New infiltrating permeable pavement on subdivided lots (sq ft) 12 New infiltrating permeable pavement outside of subdivided lots (sq ft) 13 Exisitng BUA that will remain (not subject to permitting) (sq ft) 14 Existing BUA that is already permitted (sq ft) 15 Existing BUA that will be removed (sq ft) 16 Percent BUA 65%67%89% 17 Design storm (inches)1 in 1 in 1 in 18 Design volume of SCM (cu ft)3652 cf 4622 cf 403 cf 19 Calculation method for design volume SCS SCS SCS SCS 20 DRAINAGE AREA INFORMATION ADDITIONAL INFORMATION Offsite drainage area is existing adjacent building and parking lot that will drain into proposed infiltration system. Other BUA is misc concrete pads. Infiltration systems designed to treat 1.8" rainfall per project and government requirments, will exceed required NCDEQ 1.0" requirements. Please use this space to provide any additional information about the drainage area(s): 1 Drainage area number 12 2 Design volume of SCM (cu ft) 3652 cf 4622 cf 3 Is 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)? :1 :1 6 Does the SCM have retaining walls, gabion walls or other engineered side slopes? Yes Yes 7 Are the inlets, outlets, and receiving stream protected from erosion (10-year 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? Pump (preferred) Pump (preferred) 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)? No No 13 If the SCM is on a single family lot, does (will?) the plat comply with General MDC (10)?No No 14 Is there an O&M Agreement that complies with General MDC (11)? No No 15 Is there an O&M Plan that complies with General MDC (12)? No No 16 Does the SCM follow the device specific MDC? Yes Yes 17 Was the SCM designed by an NC licensed professional? Yes Yes 18 Proposed slope of the subgrade surface (%) 0% 0% 19 Are terraces or baffles provided? No No 20 Type of pretreatment: Other Other 21 Was the soil investigated in the footprint and at the elevation of the infiltration system?Yes Yes 22 SHWT elevation (fmsl) Not Encountered Not Encountered 23 Depth to SHWT per soils report (in) Not Encountered Not Encountered 24 Ground elevation at boring in soils report (fmsl) 230.00 235.00 25 Is a detailed hydrogeologic study attached if the separation is between 1 and 2 feet?No No 26 Soil infiltration rate (in/hr) 1.48 2.96 27 Factor of safety (FS) (2 is recommended): 2.00 2.00 29 Bottom elevation (fmsl) 224.00 233.00 30 Storage elevation (fmsl) 228.40 237.37 31 Bypass elevation (fmsl) 228.40 237.37 32 Bottom surface area, ft2: 2244 ft 2772 ft 33 Storage elevation surface area (ft2) 2100. ft 2579. ft 34 Length (ft) 35 Width (ft) 36 Perforated pipe diameter, if applicable (inches) 37 Number of laterals 38 Total length of perforated piping 39 Stone type, if applicable 40 Stone void ratio (%) 41 Is stone free of fines? 42 Is the stone wrapped in geotextile fabric? 43 Has at least one infiltration port been provided? 44 Design volume of SCM (cu ft) 3652 cf 4622 cf 45 Time to drawdown (hours) 26 hrs 13 hrs 46 Please use this space to provide any additional information about the infiltration system(s): Oldcastle tank system will rest on a 24" thick #57 gravel bed extending 12" outside of concrete tank system. Entire gravel bed will be wrapped in Geofabric to protect underlying soils and provide for easy sediment removal. System does not require an easements nor O&M agreements as it is located on a U.S. military instalation. ADDITIONAL INFORMATION For Trenches Only Volumes/Drawdown INFILTRATION SYSTEM GENERAL MDC FROM 02H .1050 INFILTRATION SYSTEM MDC FROM 02H .1051 Soils Data Elevations For Basins Only Infiltration 3 11:34 AM 7/6/2020 FILTERRA BIORETENTION 1 Drainage area number 3 2 Design volume of SCM (cu ft) 403 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)? n/a 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? Other 10 If applicable, will the SCM be cleaned out after construction?Yes 11 Does the maintenance access comply with General MDC (8)?No 12 Does the drainage easement comply with General MDC (9)?No 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)?No 15 Is there an O&M Plan that complies with General MDC (12)?No 16 Does the SCM follow the device specific MDC?Yes 17 Was the SCM designed by an NC licensed professional?Yes 18 Type of pretreatment that will be used N/A 19 Depth of storage above the filter media surface (in) 9 in 20 Surface area of the Filterra Bioretention system (sq ft) 24 sf 21 Method of flow distribution over the media Bypass Pipe 22 Infiltration rate of engineered media (inch/hour) 140 in/hr 23 Diameter of the underdrain pipes (if applicable) 4 in 24 Does the design include Internal Water Storage (IWS)?No 25 if so, elevation of the top of the IWS (fmsl) 26 Elevation of the planting surface (fmsl) 229.72 27 Species of tree(s) that will be planted Per Manufacture 28 Media depth (inches) 21 in 29 Number of clean out pipes 1 30 Will maintenance be performed per the Filterra O & M Manual?Yes 31 Please use this space to provide any additional information about the Filterra Unit(s): ADDITIONAL INFORMATION FILTERRA BIORETENTION MDC FROM THE STORMWATER DESIGN MANUAL GENERAL MDC FROM 02H .1050 System does not require easement nor maintenance agreements as it is located on a military base.