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HomeMy WebLinkAboutSW3141103_Supplement-EZ Form_20240822 SUPPLEMENT-EZ COVER PAGE 1 FORMS LOADED, PROJECT INFORMATION 1 Project Name AIIYIy-Building lttpansion 2 Prc(ect Area iaci- — 32.5486 3 Coastal Wetland Area(ac) 4 Surface Water Area(ac) 5 Is this project High or Low Densityl T t•IQh 6 Does this project use an off-site SCM? No COMPLIANCE WITH 02H.1003(4) 7 Width of vegetated setbacks provided(feet) _ 8 Will the vegetated setback remain vegetated? NIA 9 If BUA Is ed In the setback,does It meet NCAC 02H.1003(4Xc-d)? NIA 10 Is streembank stabilization proposed on this prooect? No NUMBER AND TYPE OF SCMs: 11 Infiltration System -. 12 Bioretention Cel 13 Wet Pond 14 Stormwater Wetland - 15 Permeable Pavement 16 Sand Filter 5 17 Rainwater Harvesting(RWHI 18 Green Roof 19 jlevel Spreader-Filter Strip(LS-FS) 20 Disconnected Impervious Surface(DIS) 21 Treatment Swale 22 Dry Pond_ 23 StarmFllter • • 24 3ilva Cell — 25 Bayilter 26 Fitterra FORMS t.0AME0 DESIGNER CERTIFICATION 27 Name and Title: Carlton T Burton,Principle 28 Organization Burton Engineering Associates i29 Street address: 5950 Fairview Rd,Suite 100 30 City,State,Zip Charlotte.NC 28210 31 Phone number(s!: 704 533 8881 32 Email. cburtonOburtoneng.corn Certification Statement; I certify,under penalty of law that this Supplement-EZ form and all supporting information ware 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 Orsfgnor dk FESSI •'QO Otii' aPiZh 4 • SEAL • = Signature of Designer • 12557 • • �• NQit E*� ,�0� Zr ' ,'��•,,,� pNNB� `�•o`;$•Z,r Date r2024 DRAINAGE AREAS 1 Is this a high density project? i Yes 2 If so,number of drainage areaslSCMs i 5 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 FORM LOAgja DRAINAGE AREA INFORMATION Entire Sits 1 2 3 4 4 Type of SCM Sandfilter Sandfilter _Y- Sandfitter Sandfilter 5 Total drainage area(sq ft) 127195 230868 a 148054 131377 6 Onsite drainage area(sq ft) 114127 230868 _ 148054 131377 7 Offsite drainage area(sq ft) 13068 _ 8 Total BUA in p_roject(sgftt 114127 sf r_175547 sf 118.943 sf 79266 sf New BUA on subdivided lots(subject to 9 permittiV(sgk -� New BUA not on subdivided lots(subject to 10 'permitting)(sl) - - 114127 sf - 175547 sf 118943 sf 79266sf_. _ 11 Offsite BUA(stilt) __ 12 Breakdown of new___B__UA not on subdivided_lots: _ _ _ -Parking(sq ft) 54886 sf 116274 sf 3655 sf 58316 sf -- -Sidewalk(sq ft) 2573 sf 668 sf -'_ 3153 sf ►--- -Roof(sq ft) k 56700 sf 56700 sf 107318 sf ^4 -Roads Mil 7302 sf 17797 sf _ -Future(sq ft) -Other,please specify In the comment box below(sq. --• -,--- — �— -- . New infiltrating permeable pavement on _13 subdivided lots(sq fti - New infiltrating permeable pavement not on 14subdivided 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 90% _76% _ 80% 60% 19 Design storm(inchesL 1.0 in 1-0 in 1.0 in _ 1.0 in 20 Design volume of SCM(cu ft) 7072 cf 17472 cf _ _ 13327 cf - 6704 cf 21 Calculation method for design volume , Stage Storage _ Stage Storage _ Stale Storage Stage Storage DITIONAL INFORMATION Please use this space to provide any additional information about the 22 drainage areais): DRAINAGE AREAS 1 Is this a High density project? Yes 2 If so,number of drainage areas!SCMs 5 3 Does this ,r•ect have low density areas? No If so number of low density drainage areas 0 ©Is alvpart of this project subject to previous rule versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 5 4 _Type of SCM Sandfilter 5 Total drainage area(sq ft) 202198 6 Onsite drainage area(sq ft) 202198 Offsite drainage area(sq ft) 8 Total BUA in project(sq ft) 169641 sf 'New BUA on subdivided lots(subject to 9 pormitting)isgft) New BUA not on subdivided lots(subject to 10 permitting)(sf) 169641 sf 11 Ofsite BUA(sq ft) 12 Breakdown of new BUA not on subdivided lots: -Parkirx�(sq ft) _ 71964 sf -Sidewalk(sq ft) 980 sf -Roof(sq ft) 96697 sf -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) 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 alread1rpermitted(sq ft) 17 Existing BUA that will be removed(sq ft) + _ 18 Percent BUA 84% 19 Design storm(inches) __ 1-0 In 20 Design volume of SCMjcu ft) 14958 cf 21 Calculation method for design volume } Stage Storage ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 drainage area(s): SAND FILTER 1 1 Drainage area number 1 2 3 4 5 2,Minimum required treatment volume Lou 1 8818 sf I 10592 sf I 9995 sf I 5028 sf I 11219 sf 1 1GE101 AL MDC FROM Q2t( - R 3 Is the SCM sized to treat the SW from all surfaces at build-out? Yee Yes Vas Yes v-es 4 Is the SCM located away from contaminated soils? Yes Yes Yes Yes Yes 5 What are the side slopes of the SCM i H:V)? 3:1 3:1 3:1 _ 3:1 _ F 3:1 6 Does the SCM have retaining walls,gablon walls or other engineered No No No No No side sl—:•-? _ 7 Are the inlets,outlets,and receiving stream protected from erosion Yes Yes Yes Yes ` Yes (10-year storm)? _- 8 Is there an overflow or bypass for Inflow volume in excess of the Yes Yes Yes Yes Yes design volume? i 9 What is the method for dewatering the SCM for maintenance? Other Other Other Other Other - 10 If applicable,will the SCM be cleaned out after construction? Yes Yes N!A_ N/A N/A _11 Does the maintenance access comply with General MDC l81? Yes Yes _ _Yes Yes Yes I.12 Does the drainage easement comply with General MDC(917 Yes Yes - Yes Yes Yes 13 If the SCM is on a single family lot,does(will?)the plat comply with N/A NIA N/A NIA N/A General MDC 10? __ 14 Is there an O&M Agreement that complies with General MDC(11)? Yes Yes Yes Yes Yes 15 Is there an O&M Plan that complies with General MDC(12)? Yes Yes Yes Yes Yes 16 Does the SCM follow the device specific MDC? Yes Yes- Yes Yes Yes 17 Was the SCM designed byan NC licensedprofessional? Yes Yes Yes __ Yes Yes 18 SHWT elevation(fmsl) not encountered . not encountered-' not encountered not encountered not encountered 19'Type of sand filter(open or closed) .- Open _ Open Open Open Open _ 20 If closed,will the filter will be pre-cast or pour-in-place? - _ - 21 If dosed,top ofrrate elevation(fmsl) 22 Is this sand filter designed to attenuate peak flows? Yes Yes Yes Yes Yes _ [Sediment Chamber 23 Volume that can be retained In the sediment chamber(cubic feet) 3349 cf 5177 cf 10928 d 8163 cf 9225 cf 24 Will there be a permanent pwaci in the sediment chamber? No No No No No 25 Bottom of the sediment chamber(fmsl) 790.00 788.00 775 60 769.00 784.50 26 Area of the sediment chamber(square feet) 5986 sf 7639 sf 2600 sf 1600 sf 2050 sf V 27 Physical depth of the sediment chamber(inches) 24 In _ 24 In 42In_ 24 In 36 in .W 28 Pending depth in the sediment chamber,above any permanent pool gin 15 in 22 In 12 in 18in (inches) 29 Elevation of top of weir between chambers(fmsl) I 792 790 779.2 771 786 Sand Chamber y 30 Volume that can be retained in the sand chamber(cubic feet; 3443 d 5410 of 10928 cf 8163 d 1 9225 cf 311Bottom Bottom of the sand chamberffmsl) _ 789.00 787.00 775.60 769.00 784.50 32IArea of the sand chamber(square feet) 3062 sf 3944 sf 2000 sf 775 sf 2050 sf 33 Physical depth of the sand chamber(Inches) _ 36 In_ 36 in 42 in 24 in 36 in Pending depth in the sand chamber,above the sand surface 34(inches) 9 in Y 15 in 22 in 121n 18 in 35 Elevation of the bypass device(fmst) 790.7 790 778.5 772 789.25 _ _ 36 Type of bypass device riser riser _ riser riser riser 37 Mechanism for distributing flow over the sand surface Rip Rap Rip Rap_ Rip Rap Rip Rae Rip Rap 38 Sand specification for sand chamber C33 T C33 C33 C33 C33 39 Depth above underdrain pipe(inches) 18 in _� 18 in 18 in 18 in 18 in 401Aill the media be maintained to drain at least two inches per hour at Yes Yes Yes Yes Yes !the sand surface? 41 Is at least one clean-out pipe provided at the low point of each Yes Yes Yes Yes Yes underdrainline? _ __ __ _ 42 Will clean-outp'es be capped? Yes Yes Yes Yes Yes ADDITIONAL INFORMATION �- 43 Please use this space to provide any additional information about the sand filter(s): 2