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Home My WebLink AboutSW3201003_SUPPLEMENT - EZ COVER PAGE_20201103SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 Project Name Auto Finance & Car Care Center 2 Project Area (ac) 5.717 3 Coastal Wetland Area (ac) 0 4 _ Surface Water Area ac) 0 5 Is this project High or Low Density? Hi h 6 Does this project use an off -site SCM? No COMPLIANCE WITH 02H .1003(4)� 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? _ No NUMBER AND TYPE OF SCMS: 11 Infiltration System 0 12 Bioretention Cell 0 13 Wet Pond j 0 14 Stormwater Wetland 0 15 Permeable Pavement p 16 Sand Filter 1 17 Rainwater Harvesting (RWH); 0 18 Green Roof 0 19 Level Spreader -Filter Strip (IS-FS) 0 20 Disconnected Impervious Surface (DIS) 0 21 Treatment Swale 0 22 Dry Pond 0 23 StormFilter 0 24 Silva Cell _ 0 25 Bayfllter 0 26 Filterra 0 FORMS LOADED DESIGNER CERTIFICATION andTitle Vincent G. Keene P.E. T27Name ganization: Yarbrough -Williams & Houle, Inc. eet address: -_- P.O. Box 1198 30 City, State, Zip_ _ ---- Pineville, NC 28134 31 !Phone number(s). 704-556-1990 32 1 Email m i vincek@y-wh.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. A®5++I IsII11118s1 � O® II 1763 saes®P,,'Iy- Slzdh+a+ °+,+',�� j `s !4 2,0 it/� rda Signature f D ign - 0V�1�i`�2® Date SAND FILTER 1 Drainage area number 1 2 Minimum re uired treatment volume cu ft9432 sf GENERAL MU ; FROM 02H .105 " s 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 NI O — side slopes? 7 Are the inlets, outlets, and receiving stream protected from erosion Yes ' (1 0-year storm)? Is there an overflow or bypass for inflow volume in excess of the design volume? Yes h What is the method for dewatering the SCM for maintenance? Pum ( referred) 11f applicable, will the SCM be cleaned out after construction? Yes Does the maintenance access comply with General MDC (8)? Yes Does the drainage easement comply with General MDC (9)? Yes the SCM is on a single family lot, does (will?) the plat comply with eneral MDC (10)? Yes 417 ' Yes s there an O&M Agreement that complies with General MDC (1�----4 there an O&M Plan that complies with General MDC (12)v Yes _ oes the SCM follow the device specific MDC? Yes v as the SCM designed b an NC licensed rofessionai? Yes SAND' FILTER MDC FROM 02H..1056 18 NOT SHWT elevation (fmsl) ENCOUNTERED (DUG TO 677.5 19'Type 20 of sand filter (open or closed) Open If closed, will the filter will be pre -cast or pour -in -place? 21 If closed, top of grate elevation (fmsl) i EE� 22 Is this sand filter designed to attenuate peak flows? Yas [Sediment Chamber 23 Volume that can be retained in the sediment chamber (cubic feet) 44760 cf 24 Will there be a permanent pool in the sediment chamber? No 25 Bottom of the sediment chamber fmsl) 685.00 26 jArea of the sediment chamber (square feet) 1850 sf 27 Ph sical de th of the sediment chamber (inches) 24 in 28 Ponding depth in the sediment chamber, above any permanent pool (inches) ; 24 in 29 Elevation of top of weir between chambers fmsl) 687 30 lVolume that can be retained in the sand chamber cubic feet) 37862 cf 31 Bottom of the sand chamber (fmsl) 684.50 32 _ Area of the sand chamber (square feet) 10150 sf 33 Physical depth of the sand chamber (inches) 66 in 34 _ Ponding depth in the sand chamber, above the sand surface 50 in (inches) 35 Elevation of the bypass device (fmsl) 687.3 36 Type of bypass device 4' WEIR 37 38!Sand 39!Depth _ Mechanism for distributing flow over the sand surface — 3" layer of sod or _ ( washed stone ASTM C-33 MEDIUM specification for sand chamber AGGREGATE CONCRETE SAND above underd rain pipe (inches) 30 in 40 Will the media be maintained to drain at least two inches per hour at the sand surface? Yes 411 _ Is at least one clean -out pipe provided at the low point of each underdrain line? Yes 42 Will clean -out pipes be canoed? Ve ATIONAL INFORMATION 43 i' Please use this space to provide any additional information about _sand filters) Sand Filter 1 8:51 AM 10/15/2020 DRAINAGE AREAS 1 Is this a high densit ro ect? Yes 1 2 If so, number of drainage areas/SCMs 1 3 boes this project have low density areas? No 4 '1 If so, number of low density draina a areas 0 5 Is all/part of this project subject to previous rule versions? No FORMS LOADED rDRAIN AGE AREA INFORMATION 4 Type of SCM Entire Site 1 Sand Filter 5 Total drainage area (sq ft _ 211701 211701 6 Onsite drainage area (sq ft 196484 196484 7 Offsite drainage areas ft 15086 15086 8 Total BUA in project (sq ft 113994 sf 113994 sf 9 New BUA on subdivided lots (subject to permitting) s ft 10permitting) New BUA not on subdivided lots (subject to s 113994 sf 113994 sf 11 Offsite BUA (sq ft) 12 Breakdown of new BUA not on subdivided lots: Parkin _(sq ft) 67604 sf 67604 sf Sidewalk (sq ft 3190 sf 3190 sf Roof (sq ft 42500 sf 42500 sf Roadway s ft Future (sq ft Other, please specify in the comment box below (sg ft 700 sf 700 sf j 13 New infiltrating permeable pavement on subdivided lots s ft 14 New infiltrating permeable pavement not on subdivided lots (sq ft _ 15 Existing BUA that will remain (not subject to ermittin s ft 16 Existing BUA that is already permitted (sq ft 17 _ Existing BUA that will be removed (sq ft) 18 Percent BUA 54% _ 54°!a 19 Design storm inches 1.0 in 4. I in 20 Design volume of SCM cu ft 9432 cf 9432 cf 21 Calculation method for design volume _ 1" WQV 1" WQV ADDITIONAL INFORMATION 22 Please use this space to provide any additional information about the drainage area(s)_ Other includes areas for trash dumpster. Treated the 1" WQV, detained 1, 2, and 10 year storms. Designed for 1' of freeboard in the 100 year storm.