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Home My WebLink AboutSW6240703_Supplement-EZ Form_20240724 SUPPLE MENT-EZ MENT-EZ COVER PAGE r ).OAO SUPPLEMENT FORMS PROJECT INFORMATION 1 Project Name Magnolia Hills Apartments 2 rPooject Area(aci 23.57 3 !Coastal Wetland Area(ac) 0 4 Surface Water Area(ac) 0 5 Is this project High or Low Density? _��---.- Hgh6 Does this project use an off-site SCM? 'COMPLIANCE WITH 02H.1003(4) x..=a 7 Width of vegetated setbacks provided(feet) _ _ N/A 8 'Will the vegetated setback remain vegetated? N/A 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? 1 No NUMBER AND TYPE OF SCMs: 11 Infiltration System 12 Bioretention Cell _ 2 13 Wet Pond 14 Stormwater Wetland 15 Permeable Pavement _ 16 Sand Filter �_ 17 Rainwater Harvest ng(RWHI _ 18 Green Roof __ _ _ 19 Level Spreader-Filter Strip(LS-FS) 20 Disconnected Impervious Surface(CIS) 21 Treatment Swale 22 Dry Pond 23 StormFilter 24 Silva Cell 25 Bayfllter 26 Filterra LOAD SUPPLEMENT FORMS DESIGNER CERTIFICATION _27 Name and Ttle: _ . Philp A.-Pioemo _ _28 Organization: _ LKC Engineering PLIC 29 Street address . _ - 140 Aqua Shed Ct 30 City,State,Zip: Aberdeen Nc 28315 31 Phone number(s) 910-420-1437 r 32 Email philip@lkcengineering.com Certification Statement: l 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 peafuner Me f. c" J 4.q.e 1. 11ud % 1 . Signature esigner 043255 fipa PIGS' _ �•• _ t.I ea �1 Seal Date DRAINAGE AREAS 1 Is this a high density project? Yes 2 If so,number of drainage areas/SCMs 2 3 Does this project have low density areas? No 4 If so,number of low density drainage areas 0 Is all/part of this project subject to previous rule 5 versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 1 2 4 Type of SCM Bioretention Bioretention Bioretention 5 Total drainage area(sq ft) 1,026,760 249,177 323,546 6 Onsite drainage area(sq ft) 1,026,760 249,177 323,546 7 Offsite drainage area(sq ft) 8 Total BUA in project(sq ft) 358498 sf 161476 sf 183373 sf New BUA on subdivided lots(subject to permitting) 9 (sq ft) _ New BUA not on subdivided lots(subject to 10 permitting)(sf) 358498 sf 161476 sf 183373 sf 11 Offsite BUA(sq ft) 12 Breakdown of new BUA not on subdivided lots: -Parking(sq ft) 90323 sf 48066 sf 42257 sf -Sidewalk(sq ft) 55295 sf 15817 sf 39478 sf -Roof(sq ft) 103749 sf 49907 sf 53842 sf -Roadway(sq ft) 91536 sf 47686 sf 41249 sf -Future(sq ft) -Other,please specify in the comment box below(sq ft) 17595 sf 6547 sf New infiltrating permeable pavement on 13 subdivided lots(sq ft) New infiltrating permeable pavement not on 14 subdivided lots(sq ft) Existing BUA that will remain(not subject to 15 permitting)(sq ft) 16 Existing BUA that is already permitted(sq ft) 17 Existing BUA that will be removed(sq ft) 18 Percent BUA 35% 65% 57% 19 Design storm(inches) 1.0 in 1.0 in 1.0 in 20 Design volume of SCM(cu ft) 13149 cf 15101 cf 21 Calculation method for design volume Simple Method I Simple Method Simple Method ADDITIONAL INFORMATION Ir Please use this space to provide any additional information about the 22 drainage area(s): Other DA's incluide dumpster pad,block walls,tennis courts,playground, pump station,and walking trail.The discrepancies between"entire site" BUA and the addition of DA 1 and 2 BUA's is due to small portions of sidewalk,roadway,and other BUA that is not detained in DA1 or 2. BIORETENTION CELL 1 Drainage area number 1 I 2 Minimum required treatment volume(Cu ft) 13149 cf 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 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)? Yes 12 Does the drainage easement comply with General MDC(9)? N/A 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(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 18 SHWT elevation(fmsl) 359 19 Bottom of the bioretention cell(fmsl) 374.00 20 Ponding depth of the design storm(inches) 12 in 21 Surface area of the bioretention cell(square feet) 9983 sf 22 Design volume of SCM(cu ft) 13149 cf 23 Is the bioretention cell used for peak attenuation? yes 24 Depth of peak attenuation over planting surface(in) 24 in 25 Height of peak attenuation outlet above the planting surface(in) 24 in 26 Infiltration rate of the in situ soil(inch/hour) 1 in/hr 27 Diameter of the underdrain pipes(if applicable) 4 in 28 Does the design include Internal Water Storage(IWS)? No 29 if so,elevation of the top of the IWS(fmsl) 30 Elevation of the planting surface(fmsl) 377 31 What type of vegetation will be planted? (grass,trees/shrubs, other)? Grass 32 Media depth(inches) 36 in 33 Percentage of medium to coarse washed sand by volume 65-80% 34 Percentage of fines(silt and clay)by volume 5-10% 35 Percentage of organic matter by volume 10-20% 36 Type of organic material Pine Bark 37 Phosphorus Index(P-Index)of media(unitless) 20 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) 41 Type of mulch,if applicable 42 How many clean out pipes are being installed? 11 43 Type of pretreatment that will be used: Rip-Rap ADDITIONAL INFORMATION 44 Please use this space to provide any additional information about the bioretention cell(s): Bio#1 3 11:27 AM 6/21/2024 BIORETENTION CELL 1 Drainage area number 2 I 2 Minimum required treatment volume(Cu ft) 15101 cf 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 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)? Yes 12 Does the drainage easement comply with General MDC(9)? N/A 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(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 18 SHWT elevation(fmsl) 359 19 Bottom of the bioretention cell(fmsl) 374.00 20 Ponding depth of the design storm(inches) 12 in 21 Surface area of the bioretention cell(square feet) 10488 sf 22 Design volume of SCM(cu ft) 15101 cf 23 Is the bioretention cell used for peak attenuation? yes 24 Depth of peak attenuation over planting surface(in) 24 in 25 Height of peak attenuation outlet above the planting surface(in) 24 in 26 Infiltration rate of the in situ soil(inch/hour) 1 in/hr 27 Diameter of the underdrain pipes(if applicable) 4 in 28 Does the design include Internal Water Storage(IWS)? No 29 if so,elevation of the top of the IWS(fmsl) 30 Elevation of the planting surface(fmsl) 377 31 What type of vegetation will be planted? (grass,trees/shrubs, other)? Grass 32 Media depth(inches) 36 in 33 Percentage of medium to coarse washed sand by volume 65-80% 34 Percentage of fines(silt and clay)by volume 8-10% 35 Percentage of organic matter by volume 10-20% 36 Type of organic material Pine Bark 37 Phosphorus Index(P-Index)of media(unitless) 20 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) 41 Type of mulch,if applicable 42 How many clean out pipes are being installed? 12 43 Type of pretreatment that will be used: Rip-Rap ADDITIONAL INFORMATION 44 Please use this space to provide any additional information about the bioretention cell(s): Bio#2 4 11:27 AM 6/21/2024