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Home My WebLink AboutSW3190804_2712 - Pine Forest II Signed Supplement EZ form_2/14/2020SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 Project Name Pine Forest II 2 1 Project Area ac 29.36 3 Coastal Wetland Area ac 0 4 Surface Water Area (ac 0.397 5 Is this project High or Low Density? High 6 Does this project use an off -site SCM? No COMPLIANCE WITH 02H .1003(4) 7 I Width of vegetated setbacks Yes 10 1Is streambank stabilization proposed on this project? 1 No I NUMBER AND TYPE OF SCMs: 11 Infiltration System 0 12 Bioretention Cell 0 13 Wet Pond 0 14 Stormwater Wetland 0 15 _ ____ Permeable Pavement 0 16 Sand Filter 2 17 Rainwater Harvesting RWH) 0 18 Green Roof 0 19 Level Spreader -Filter Strip LS-FS 0 20 Disconnected Impervious Surface (DIS) 0 21 Treatment Swale 0 22 D Pond �__ 0 0 0 0 0 23 StormFilter 24 Silva Cell 25 Bayfilter 26 Filterra FORMS LOADED DESIGNER CERTIFICATION Name and Title: Patrick Murh y - Department Manager R. Joe Harris & Associates 1186 Stonecrest Blvd. Tega Cay, SC 29708 (803) - 802 -1799 pmurphy@rjoeharris.com 27 28 Organization: 29 Street address: 30 City, State, Zip: 31 Phone numbers : 32 Email: 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. ZN CARCAR Q ,....... •�•• • SEAL • I SEAL Signature of De 'gner 038 ' z C-4168 ��•'� ��•°° � Off.?FF � ,�� hretn e`e�� Seal Date DRAINAGE AREAS 1 Is this a hi h density project? Yes 2 If so, number of drainage areas/SCMs 2 3 Is all/part of this project subject to previous rule versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 1 2 4 Type of SCM 342484 sf Sand Filter Sand Filter 5 Total BUA in ro'ect s ft 211335 sf 114974 sf 131149 sf 67605 sf 6(sg New BUA on subdivided lots (subject to permitting) ft 182579 sf 155985 sf 7 New BUA outside of subdivided lots (subject to ermittin s 94180 sf 61805 sf 8 Offsite - total area (sq ft 570 sf 13498 sf 9 Offsite BUA (sq ft sf 1860 sf 10 Breakdown of new BUA outside subdivided lots: - Parking (sq ft -Sidewalks ft 19849 sf 11940 sf 7909 sf - Roof (sq ft Roadwa s ft 97512 sf 57533 sf 39979 sf Future (sq ft Other, please specify in the comment box below (sq ft 38624 sf 24707 sf 13917 sf 11 New infiltrating permeable pavement on subdivided lots s ft 12 New infiltrating permeable pavement outside of subdivided lots (sq ft 13permitting) Exisitng BUA that will remain (not subject to s ft 14 I Existin BUA that is alread ermitted s ft 3920 sf 2181 sf 1739 sf 15 Existing BUA that will be removed s ft 16 Percent BUA 27% 50% 37% 17 Desi n storm inches 1 in 1 in 1 in 18 Design volume of SCM cu ft) _ 17621 cf 11477 cf 19 Calculation method for design volume ADDITIONAL INFORMATION— Please use this space to provide any additional information about the 20 drainage area(s): "Other" on line 10 made up of portions of driveways within R/W Simple Method Simple Method SAND FILTER 18 SHWT elevation (fmsl) <786 781 19 Type of sand filter (open or closed) Open 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? Yes Yes [Sediment Chamber 23 ' Volume that can be retained in the sediment chamber (cubic feet) 7773 cf 6273 cf 24 Will there be a permanent pool in the sediment chamber? No No 25 Bottom of the sediment chamber (fmsl) 790.00 788.00 26 Area of the sediment chamber (square feet) 4262 sf 4727 sf 27 Physical depth of the sediment chamber (inches) 30 in 18 in 28 Ponding depth in the sediment chamber, above any permanent pool (inches) 30 in 18 in 29 Elevation of top of weir between chambers (fmsl) 794 792 Sand Chamber 30 Volume that can be retained in the sand chamber (cubic feet) 8271 cf 6077 cf 31 Bottom of the sand chamber (fmsl) 790.00 788.00 32 Area of the sand chamber (square feet) 4403 sf 4628 sf 33 Physical depth of the sand chamber (inches) 30 in 18 in 34 Ponding depth in the sand chamber, above any permanent pool (inches) 30 in 18 in 35 1 Elevation of the bypass device (fmsl) 792.5 789.5 36 Type of bypass device Orifice Orifice 37 Mechanism for distributing flow over the sand surface Reinforced Forebay Berm W/ Turf Matting Reinforced Forebay Berm W/ Turf Matting 38 Sand specification for sand chamber ASTM C33 ASTM C33 39 Depth above underdrain pipe (inches) 12 in 12 in 40 Will the media be maintained to drain at least two inches per hour at the sand surface? Yes Yes 41 Is at least one clean -out pipe provided at the low point of each underdrain line? Yes Yes 42 1 Will clean -out pipes be capped? Yes Yes Sand Filter 3 6:55 PM 2/12/2020