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Home My WebLink AboutSW4211102_Supplement-EZ Form_20221130SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION j 1 Project Name Store -It -Safe Self -Storage 2 1 Project Area ac _ . ________ _ i—_ 1.70 Ac a 3 1 Coastal Wetland Area (ac) _ 0 4 ISurface Water Area (ac) —_ _ . 0 Is this project High or Low Density? l _ High 6 IDoes this project use an off -site SCM? No _ 'COMPLIANCE WITH 02H .1003(4) 8 ]Will the vegetated setback 9 11f BUA is proposed in the s 10 Ils streambank stabilization NUMBER AND TYPE OF SCMs: on this N/A N/A No a 11 !Infiltration System Bioretention Cell 12 13 Wet Pond _ _ 14 Stormwater Wetland 15 Permeable Pavement �s 16 Sand Filter Rainwater Harvesting RWH Green RoofLevel L S reader -Filter Strip (LS-FS)Disconnected Impervious Surface (DISTreatment SwaleDry Pond 23 StormFilter 24 Silva Cell 25 Bayfilter 26 Filterra FORMS LOADED DESIGNER CERTIFICATION 28 u. 4 !Organization: _ t Stoltzfus Engineering, Inc 29 Street address: 1 683 Gralin Street _ _ 30 City, State, Zip: Kernersville, NC_27284 31 Phone numbers : i 336-904-0207 32 Email: ?� aden@seiengineering.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. Sig ature of Designer• 1(%30)Z' Zz Date DRAINAGE AREAS 1 Is this a hi h densitV project? Yes 2 1 If so, number of drainage areas/SCMs 1 3 Does this project have low densityareas? No 4 If so, number of low density drainage areas 0 r5 Is all/part of this project subject to previous rule versions? No FORMS LOADED ,DRAINAGE AREA INFORMAT�LQN_ 7= Entire Site r 1 4 iType of SCM Total drainage areas ft Onsite drainage area s ft Offsite drainage areas ft 74,186 Sand Filter 59,568 50,568 5 6 7 8 r9 Total BUA inproject s ft 58182 sf, 57650 sf New BUA on subdivided lots (subject to permitting) s ft New BUA not on subdivided lots (subject to s Offsite BUA (sq ft 58182 sf 57650 sf 10permitting) 11 12 Breakdown of new BUA not on subdivided lots: - Parking (sq ft 29279 sf 28747 sf - Sidewalk (sq ft 353 sf 353 sf - Roof (sq ft 28550 sf 28550 sf - Roadway s ft - Future (sq ft - Other, please specify in the comment box below (sq ft 13 New infiltrating permeable pavement on subdivided lots (sq ft 14 New infiltrating permeable pavement not on subdivided lots (sq ft 15permitting) Existing BUA that will remain (not subject to s ft 16 Existing BUA that is already permitted (sq ft BUA that will be removed s ftPercent BUA 78% 96%Desi r17Existin n storm inches Des!gn volume of SC(c ®� Calculation method for design volume _ 2.9 in 5305 cf Simple Method � 21 ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 ';drainage area(s): A off -site drainage area of 0.70 AC is bypassed thorugh the site via GI-4. (See site plan). SAND FILTER 1 Drainage area number 1 2 Minimum required treatment volume cu ft i 3421 sf - LERAL MDC FROM fl2F4 .1050 _.. - --' - 31 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: ? 3:1 6 Does the SCM have retaining walls, gabion walls or other engineered side slopes? Yes I 7 Are the inlets, outlets, and receiving stream protected from erosion 10- ear 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? 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)? Yes 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 1 Does the SCM follow the device specific MDC? Yes 171 SAND FILTER Was the SCM designed by an NC licensedprofessional? MDC F?OM 02H .1056 elevation (fmsl) Yes - <87 5 181SHWT 19 Type of and filter (open or closed) Open 20 If closed, will the filter will be pre -cast or pour -in -place? 21 If closed, top of grate elevation (fmsl) 22 Is this sand filter designed to attenuate peak flows? No Sediment Chamber 23 j Volume that can be retained in the sediment chamber (cubic feet)E 2630 cf 24`Will there be a permanent pool in the sediment chamber? Yes 25 Bottom of the sediment chamber (fmsl) 90.00 26 Area of the sediment chamber (square feet) A 516 sf 27 Physical depth of the sediment chamber (inches) 64 in 28 _ Ponding depth in the sediment chamber, above any permanent pool m 40 in (inches) 29 _ 1 Elevation of top of weir between chambers (fmsl) ; 92 Sand Chamber 30 Volume that can be retained in the sand chamber (cubic feet 2675 cf 31 Bottom of the sand chamber fmsl i 92.00 32 Area of the sand chamber (square feet) 525 sf 33 Physical depth of the sand chamber inches 40 in F w 34 Ponding depth in the sand chamber, above the sand surface (inches) 40 in 351 Elevation of the bypass device (fmsl) 95.3 36 Type of bypass device Spillway 37 Mechanism for distributing flow over the sand surface Grass Weir 38 Sand specification for sand chamber ASTM C-33 Sand 39 Depth above underdrain pipe (inches) i 18 in 40 Will the media be maintained to drain at least two inches per hour at the sand surface? € Yes t 41 Is at least one clean -out pipe provided at the low point of each underdrain line? Yes Yes r 42 -. Will clean -out pipes be wed? ADDITIONAL IONAL INFORMATION 43 Please use this space to provide any additional information about the':. sand filter(s) Sand Filter 1 11:57AM 11/30/2022