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Home My WebLink AboutSW3240801_Supplement-EZ Form_20240814 SUPPLEMENT-EZ COVER PAGE FORMS LOADED (PROJECT INFORMATION I 1 Project Name Adelina Phase 1 2 Project Area (ac) 230.97 3 Coastal Wetland Area (ac) N/A 4 Surface Water Area (ac) N/A 5 Is this project High or Low Density? High 6 Does this project use an off-site SCM? No COMPLIANCE WITH 02H .1003(4) I 7 Width of vegetated setbacks provided (feet) 30 & 100 8 Will the vegetated setback remain vegetated? Yes 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? Yes NUMBER AND TYPE OF SCMs:11 Infiltration System 12 Bioretention Cell 13 Wet Pond 4 14 Stormwater Wetland 15 Permeable Pavement 16 Sand Filter 1 17 Rainwater Harvesting (RWH) 18 Green Roof 19 Level Spreader-Filter Strip (LS-FS) 20 Disconnected Impervious Surface (DIS) 21 Treatment Swale 22 Dry Pond 1 23 StormFilter 24 Silva Cell 25 Bayfilter 26 Filterra FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: Matthew R. Reiking, Division Manager 28 Organization: ESP Associates, Inc. 29 Street address: 3475 Lakemont Blvd. 30 City, State, Zip: Fort Mill, SC, 29708 31 Phone number(s): (803) 802-2440 32 Email: Mreiking@ESPAssociates.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. Designer \\\`��N `��D ��`•,\N �CA%/1//, Matthew R. Reiking o fr off.,,.. �\-57, / �•, _ Signature of Designer — - - A - _ i. LICENSE NO.: s - 038830 - - F-1407 _ . - : / T '......•' ��\ I •�...........•• �\ \• 2024.06.12 13:28:01-04'00' 06/12/24 Seal Date DRAINAGE AREAS 1 Is this a high density project? Yes 2 If so, number of drainage areas/SCMs 5 3 Does this project have low density areas? No 4 If so, number of low density drainage areas Is all/part of this project subject to previous rule 5 versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 1 2 3 4 4 Type of SCM Wet Pond Wet Pond Sand Filter _ Wet Pond 5 Total drainage area (sq ft) 3,284,860 1,095,098 823,284 213,444 468,706 6 Onsite drainage area (sq ft) 3,284,860 1,095,098 823,284 213,444 468,706 7 Offsite drainage area (sq ft) 0 0 0 0 0 8 Total BUA in project (sq ft) 1,352,316 392,868 347,762 96,512 238,361 New BUA on subdivided lots (subject to _ _ _ _ _ 9 permitting) (sq ft) New BUA not on subdivided lots (subject to _ _ _ _ _ 10 permitting) (sf) 11 Offsite BUA (sq ft) - - - - - 12 Breakdown of new BUA not on subdivided lots: - Parking (sq ft) _ - - - - - - Sidewalk (sq ft) - - - - - - Roof(sq ft) - - - _ - _ - - Roadway (sq ft) - - - - - - Future (sq ft) - - - - - - Other, please specify in the comment box _ _ _ _ _ below (sq ft) New infiltrating permeable pavement on 13 subdivided lots (sq ft) N/A N/A N/A N/A N/A New infiltrating permeable pavement not on 14 subdivided lots (sq ft) N/A N/A N/A N/A N/A Existing BUA that will remain (not subject to 15 permitting) (sq ft) N/A N/A N/A N/A N/A 16 Existing BUA that is already permitted (sq ft) N/A N/A N/A N/A N/A 17 Existing BUA that will be removed (sq ft) N/A N/A N/A N/A N/A 18 Percent BUA 19 Design storm (inches) _ 1.0 in 1.0 in 1.0 in 1.0 in 20 Design volume of SCM (cu ft) 34,097 29,501 8,142 19,823 21 Calculation method for design volume HRT HRT DEQ HRT — ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 drainage area(s): D RAI NAG E AREAS 1 Is this a high density project? Yes 2 If so, number of drainage areas/SCMs 5 3 Does this project have low density areas? No 4 If so, number of low density drainage areas Is all/part of this project subject to previous rule 5 versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 5 4 Type of SCM _ Wet Pond 5 Total drainage area (sq ft) 3,284,860 684,328 6 Onsite drainage area (sq ft) 3,284,860 684,328 7 Offsite drainage area (sq ft) 0 0 8 Total BUA in project (sq ft) 1,352,316 276,813 New BUA on subdivided lots (subject to 9 permitting) (sq ft) New BUA not on subdivided lots (subject to 10 permitting) (sf) 11 Offsite BUA (sq ft) - - 12 Breakdown of new BUA not on subdivided lots: - Parking (sq ft) - - - Sidewalk (sq ft) - - - Roof(sq ft) - - - Roadway (sq ft) - - - Future (sq ft) - - - Other, please specify in the comment box below (sq ft) New infiltrating permeable pavement on 13 subdivided lots (sq ft) N/A N/A New infiltrating permeable pavement not on 14 subdivided lots (sq ft) N/A N/A Existing BUA that will remain (not subject to 15 permitting) (sq ft) N/A N/A 16 Existing BUA that is already permitted (sq ft) N/A N/A 17 Existing BUA that will be removed (sq ft) N/A N/A 18 Percent BUA 19 Design storm (inches) 1.0 in 20 Design volume of SCM (cu ft) 23,631 21 Calculation method for design volume HRT ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 drainage area(s): WET POND I Drainage area number 1 2 4 5 2 Minimum required treatment volume cu ft 83059 cf I 71864 cf I 48290 cf 57566 cf GENERAL MDC FROM 02H .1050 _ 3 Is the SCM sized to treat the SW from all surfaces at build-out? Yes Yes Yes Yes 4 Is the SCM located away from contaminated soils? Yes Yes Yes Yes 5 What are the side slopes of the SCM (H:V)? 3:1 3:1 3:1 3:1 6 Does the SCM have retaining walls, gabion walls or other No Yes No No engineered side slopes? 7 Are the inlets, outlets, and receiving stream protected from erosion Yes Yes Yes Yes (10-year storm)? 8 Is there an overflow or bypass for inflow volume in excess of the No No No No design volume? 9 What is the method for dewatering the SCM for maintenance? Drawdown Orifice Drawdown Orifice Drawdown Orifice Drawdown Orifice 10 If applicable, will the SCM be cleaned out after construction? Yes Yes Yes Yes 11 Does the maintenance access comply with General MDC (8)? Yes Yes Yes Yes _ 12 Does the drainage easement comply with General MDC (9)? Yes Yes Yes Yes _ 13 If the SCM is on a single family lot, does (will?) the plat comply with Yes Yes Yes Yes General MDC (10)? 14 Is there an O&M Agreement that complies with General MDC (11)? Yes Yes Yes Yes 15 Is there an O&M Plan that complies with General MDC (12)? Yes Yes Yes Yes 16 Does the SCM follow the device specific MDC? Yes Yes Yes Yes 17 Was the SCM designed by an NC licensed rofessional? Yes Yes Yes Yes WET POND MDC FROM 02H .1053 18 Sizing method used HRT HRT HRT HRT 19 Has a stage/storage table been provided in the calculations? Yes Yes Yes Yes 20 Elevation of the excavated main pool depth (bottom of sediment 538.00 502.00 516.00 537.00 removal) (fmsl) 21 Elevation of the main pool bottom (top of sediment removal) (fmsl) 539.00 503.00 517.00 538.00 22 Elevation of the bottom of the vegetated shelf(fmsl) _ 546.00 510.00 523.00 547.00 23 Elevation of the permanent pool (fmsl) _ 546.50 510.50 523.50 547.50 24 Elevation of the top of the vegetated shelf(fmsl) _ 547.00 511.00 524.00 548.00 _ 25 Elevation of the temporary pool (fmsl) 547.71 511.58 524.60 548.40 26 Surface area of the main permanent pool (square feet) 22943 22559 15163 23111 27 Volume of the main permanent pool (cubic feet) 99691 cf 85641 cf 56128 cf 116302 cf 28 Average depth of the main pool (feet) 7.06 ft 6.34 ft 6.14 ft 8.24 ft 29 Average depth equation used Equation 3 Equation 3 Equation 3 Equation 3 30 If using equation 3, main pool perimeter(feet) 906.0 ft 1029.0 ft 705.0 ft 945.0 ft 31 If using equation 3, width of submerged veg. shelf(feet) 5.0 ft 5.0 ft 5.0 ft 5.0 ft 32 Volume of the forebay (cubic feet) 14447 cf 12378 cf 8980 cf 16219 cf 33 Is this 15-20% of the volume in the main pool? Yes Yes Yes Yes 34 Clean-out depth for forebay (inches) 12 in 12 in 12 in 12 in 35 Design volume of SCM (cu ft) 34097 cf 29501 cf 19823 cf 23631 cf 36 Is the outlet an orifice or a weir? Orifice Orifice Orifice Orifice 37 If orifice, orifice diameter (inches) 2 in 2 in 2 in 2 in 38 If weir, weir height (inches) 39 If weir, weir length (inches) 40 Drawdown time for the temporary pool (days) 2.27 2.17 2.59 2 41 Are the inlet(s) and outlet located in a manner that avoids short- Yes Yes Yes Yes circuiting? 42 Are berms or baffles provided to improve the flow path? _ Yes Yes Yes Yes 43 Depth of forebay at entrance (inches) 54 in 54 in 66 in 66 in 44 Depth of forebay at exit (inches) 54 in 54 in 66 in 66 in 45 Does water flow out of the forebay in a non-erosive manner? Yes Yes Yes Yes 46 Width of the vegetated shelf(feet) 10 ft 10 ft 10 ft 10 ft 47 Slope of vegetated shelf(H:V) 10:1 10:1 10:1 10:1 48 Does the orifice drawdown from below the top surface of the Yes Yes Yes Yes permanent pool? 49 Does the pond minimize impacts to the receiving channel from the 1- Yes Yes Yes Yes yr, 24-hr storm? 50 Are fountains proposed? (If Y, please provide documentation that No No No No MDC(9) is met.) 51 Is a trash rack or other device provided to protect the outlet system? Yes Yes Yes Yes 52 Are the dam and embankment planted in non-clumping turf grass? Yes Yes Yes Yes 53 Species of turf that will be used on the dam and embankment Wetland Mix Wetland Mix Wetland Mix Wetland Mix 54 Has a planting plan been provided for the vegetated shelf? Yes Yes Yes Yes ADDITIONAL INFORMATION 755 Please use this space to provide any additional information about the wet pond(s): - ] Wet Pond 4 3:14 PM 6/13/2024 SAND FILTER 1 Drainage area number 5 2 Minimum re uired treatment volume cu ft 6107 sf GENERAL MDC FROM 02H .1050 _ 3 Is the SCM sized to treat the SW from all surfaces at build-out? Ycs 4 Is the SCM located away from contaminated soils? Yes 5 What are the side slopes of the SCM (H:V)? 3:1 Does the SCM have retaining walls, gabion walls or other 6 No engineered side slopes? 7 Are the inlets, outlets, and receiving stream protected from erosion Yes (10-year storm)? 8 Is there an overflow or bypass for inflow volume in excess of the No design volume? 9 What is the method for dewatering the SCM for maintenance? Drawdown Orifice 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 Yes 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 rofessional? Yes SAND FILTER MDC FROM 02H .1056 18 SHWT elevation (fmsl) N/A 19 Type of sand filter (open or closed) Open 20 If closed, will the filter will be pre-cast or pour-in-place? 2j If closed, top of grate elevation (fmsl) 22 Is this sand filter designed to attenuate peak flows? Yes Sediment Chamber 23 Volume that can be retained in the sediment chamber (cubic feet) N/A 24 Will there be a permanent pool in the sediment chamber? _ N/A 25 Bottom of the sediment chamber (fmsl) N/A 26 Area of the sediment chamber (square feet) N/A 27 Physical depth of the sediment chamber (inches) N/A 28 Ponding depth in the sediment chamber, above any permanent N/A pool (inches) 29 Elevation of top of weir between chambers (fmsl) N/A Sand Chamber 30 Volume that can be retained in the sand chamber (cubic feet) 6107 cf _ 31 Bottom of the sand chamber (fmsl) _ 552.50 32 Area of the sand chamber (square feet) 1,552.00 _ 33 Physical depth of the sand chamber (inches) 1.50 34 Ponding depth in the sand chamber, above the sand surface 0.87 (inches) 35 Elevation of the bypass device (fmsl) _ 558.00 36 Type of bypass device Riser 37 Mechanism for distributing flow over the sand surface _ Sheet Flow 38 Sand specification for sand chamber ASTM C33 39 Depth above underdrain pipe (inches) 24 in 40 Will the media be maintained to drain at least two inches per hour at Yes the sand surface? 41 Is at least one clean-out pipe provided at the low point of each Yes underdrain line? 42 Will clean-out pipes be ca ed? Yes ADDITIONAL INFORMATION 43 Please use this space to provide any additional information about the sand filter(s): Sand Filter 5 3:14 PM 6/13/2024 DRY POND 1 Drainage area number 4.90 2 Minimum required treatment volume (cu ft) 8142.09 GENERAL MDC FROM 02H .1050 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)? 3:1 Does the SCM have retaining walls, gabion walls or other 6 No engineered side slopes? 7 Are the inlets, outlets, and receiving stream protected from erosion Yes (10-year storm)? 8 Is there an overflow or bypass for inflow volume in excess of the 1 No design volume? 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)? 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 Yes 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 desi•ned b an NC licensed •rofessional? Yes DRY POND MDC FROM 02H .1062 18 SHWT elevation (fmsl) N/A _ 19 Elevation of the bottom of the dry pond (fmsl) 554.00 20 Distance from bottom to SHWT (feet) N/A 21 Elevation of the temporary pool during the design storm (feet) 554.87 22 Ponding depth of the design storm (feet) 4 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 avoids short- Yes circuiting? 26 Will berms or baffles be provided to increase the flow path? Yes 27 What method of pretreatment will be provided? N/A 28 Design volume of SCM (cu ft) 6106.57 29 Diameter of drawdown orifice (in) N/A 30 Drawdown time for the temporary pool (hours) Does the pond minimize impacts to the receiving channel from the 31 Yes 1-yr, 24-hr storm? 32 Is there a small permanent pool near the orifice to prevent No clogging? 33 Will the outlet be designed to prevent clogging? Yes 34 Are the dam and embankment planted in non-clumping turf grass? Yes 35 Species of turf that will be used on the dam and embankment Wetland Mix 36 Will trees and shrubs be prevented from growing on the dam and Yes embankment? ADDITIONAL INFORMATION 37 Please use this space to provide any additional information about the dry pond(s): Dry Pond 6 3:14 PM 6/13/2024