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Home My WebLink AboutSW6211003_Supplement-EZ Form_20211019NUMBER AND TYPE OF Will 11 Infiltration System 0 ..., 12 ........ Bioretention Cell ._ _..... ........ ......... ___ ......... ......... ....... ......... 0 13 Wet Pond _ ,._ ____—_ 1 — ....._. ... ....... ..- 14 Stormwater Wetland ....,........, , ,.,.,, :� ., ................. ..._ .. . �------. -- _............ 0 15 ........ Permeable Pavement ........ ..... ...... ...... 0 �.... ... 16 _ Sand Filter 0 17 Rainwater Harvesting (RWH) 0 18„ Green Roof ,,, „ , ,,, .., ........ .. ... — �., 19 Level Spreader Filter Strip (LS-FS) 0 20 Disconnected Im erviou s Surface (DIS.).._ 21 Treatment Swale ...... _ .. . 0 22 Dry Pond .. ....r..... ............... ....... 0 23 ........ StormFilter ......__ ... --------- ------- 0 _ . . ....,., 24 Silva Cell --- .... ...... ..... ...... ........ ....... ......... 0 ... .... ... .- — 25 B------ er — 0 26 Filterra 0 FORMIS i_OADED 27 Name and Title: .. .... 28 Organization ..... 29 Street address: 30 City_ State Zip_ 31 Phone number(; 32 EmaW Matt Lowder IPI; om 4004 Barrett Dr, Suite 101 Raleigh, NC 27609 919-553.6570 „ mpowvd wail wM ti t, C 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. r rm ��d'��'a�stutcelvr,,h Seal Signature of Designer Date 0 DRAINAGE AREAS 1 Is this a high de __ ............................ _ .....__ _ - nsity project? Yes 2.. ...................... If so, number of draina a areas/SCMs 1 3 Doesµthis profeot 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 versi11ons N° _. p POiV" 5, a.41a" D11.D DRAINAGE AREA INFORMATION Entire Otte �w 4.®. T e of SCM et Pond Wet Pond r...w�.__ 5 ___.......... Total drainage area s_ ft �W...__... ��..._ 88000 x _e88000 -...�,._, 43549 6 Onsite drainage areas ft 43549� ?._ drainage area_(sq ft) 8.... ..Offsite �._...... TNot.a�.l prec(sq„ft) .......... ...._ .... _.. 3496 ,sf 343_7_9 .s.__fBUA.in ..... ....... ew BUAon subdivided lots (subject to permitting) 9 (sq_ft)..... .....—......... ........ ...., New BUA not. on subdivided lots (subject to 10 ------- permitting) (sf) ------ 11ww Offsite BUA (sq ft) „ ......... .......�. _ ..,�� __- -___�- 12 Breakdown of new BUA not on subdivided lots: .......................... a.........,..................,..............................................................................................._,....,... P rkin s ft _._... g (,. q. )_ .. ....... ... ..........................................._m... 22293 Sf _...................,...........,.......__....._.......__............., 22064 sf Sidewalk 1973 sf 1675 sf Roofsq ft) 10640 sf 10640 sf Roadwgy,(s ft�) .. .......... �...�.. ... .. _._, .......-- - Future (sq ft) „ _.r... _..... ......,m� - Other, please specify in the comment box _._ below (sq ft) .... — - 1 New infiltrating permeable pavement on�� 1 3 YYe ,subdivided lots (sq New infiltrating permeable pavement not on� �.4.... ides fsq ft subdivided lot ...... ..... ....�........................................ ................... Existing BUA that will remain (not subject to w. 15 pffmdtin s ft 16 Existina BUA that is already permitted (sq ft) — — 17 Existing BUA that will be removed —__. 18 ---- Percent BUA 40% 79% 19... — Desig.... n storm (inches) _ .. _. _...... .w......... ......._......... ... 1..0 in .....e- ... 20 Design volume of SCM (cu ft) 2761„wcfetlOwnn, 21 Calculation method for design volume Sim le Method ADWTIONA 1NPQRMATIQN..... 1Please use this space to provide any additional information about the 22 drainage area(s): A small area around the North Old Wire Rd driveway and the portion of the sidewalk on the southwest part of the building are not being captured. FT.POND 1 dDrtarnage area number 1 �2Mimmum re wired treatment volume cu ft 2761cf Ef1Al MLDC. FROM 02H.IMMO 3 Is the SCM sized to treat the SW from all surfaces at build -out? Yes _ 4 ... _, w.. ......... ....__ .... Is the SCM located away from contaminated soils? Yes 5 What are the side slopes oft SCM (H V�� 3 1 6 ...___.. — Does the SCM have retaining walls, gabion walls or other .,.., .. No engineered side slopes? ...... 7 Are the inlets, outlets, and receiving stream protected from erosion Yes _ (10-year storm)? 8 Is there an overflow or bypass for inflow volume in excess of the Yes design volume? 9 is the method for dewatering„the SCM for maintenance? What...., Pump (prefe .., 10 cleaned construction? If applicable, will the SCM be cleaned out aft co structi � Yes 11 _........ ..... ...........'... Does the maintenance access comply with General MDC (8)? Yes 1.. 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 N/A General MDC (10)? 14 Is there an O&M Agreement that complies with General MDC (11)? Yes 15 e ..... _ an O&M Plan that complies with General MDC (12)? Is ther...�..�W..... Yes 16 ............... Does the SCM follow the device specific MDC? ..w_ Yes 18 1M u udtlilmAnmlm rvwmmimH im GwHwOUwNNbwxaGwuYwWWwlarvMmmwer/MA _. Sizing method used IIWYWwI4wWNNJ n SA/DA_ 19 ... Has a stage/storage table been provided in the calculations? Yes 20 Elevation of the excavated main pool depth (bottom of sediment 195.00 removal (fmsl) 21 Elevation of the main pool bottom (top of sediment removal) (fmsl) 196.00 22 Elevation of the bottom of the vegetated shelf (fmsl� 202 00 23 Elevation of the permanent pool (fmsl) 202.50 4 Elevaton of the top of the vegetated shelf {fmsl) 203.00 25 Elevation of the temporary pool (fmsl) 203.50 26 Surface area of the main permanent pool (spuare feet) 1738 27 Volume of the main permanent pool (cubic feet) 3998 cf 28 Average depth of the main pool {feet 3.10 ft .W 29 .. ._.... Average depth equation used — ..�, Ecuatwn 3 30 If usin ec)uation 3 mampool perimeter (fee t) 170.0 ft 31 m..... If using equation 3, width of subme�rc ed veg_shelf (feet) ....... 3.0 ft 32 Volume of the ff ree cubic feet� 620 cf 33 Is this 15 20% of the volume in main the pool? p ? _ Yes 34 Clean out de th for foreba (inches p ..._Y..... 30 in 35 m...rc ....., _... .................... Design volume of SCM (cu ft� -- ......_. mm. __ 2761 cf 36 Is the outlet an orifice or a weir? Orifice 37 �- If orifice orifice diameter (inches) _ - --- 75 in 38 If weir weu hei ht (inches 39 If weir, weir length. (inches) 40 _...--__....__....___........__..-_.........____......._„_,y..,,,....__ . Drawdown time for the temporary pool (days) ,.., .. 2 84 41 Are the inlet(s) and outlet located in a manner that avoids short- Yes circurtmq _ 4 2 Are berms or baffles provided to im rove the fl ow path? p Yes _ 3 .mp.._ Depth of forebay at entrance (inches) 42 in 44 De th of foreba y at exit (inches) p 36 in 45 Ae _ _ , _m -� ....... ... ...... ... Does water flow out of the foreba in a non -erosive manner? Yes 46 Width... f the ve o g elf (feet) sh... .n, 6 ft 47 ..elated ...,.. _ Slope of vegetated shelf (H:V) ...... 48'Does _.... ...............................................................................................s:1 the orifice drawdown from below the top surface of the _......... Yes -- permanent pool? 49 Does the pond minimize impacts to the receiving channel from the 1 Yes yr 24 hr storm? _,...-. -......................... ..- ... ..... ..... w 50 Are fountains proposed? (If Y please provide documentation that No 51 Is a trash rack or other device provided to protect the outlet system? Yes 52 Are the dam and embankment planted in non -clumping turf grass? Yes ___ 53 _..... .......- Species of turf that will be used on the dam and embankmentHybrid _ Bermuda 54 Hasa ' lantrol _are laeer oovidod f r the ve otatod shelf? Yes (�fCth�41 )�p� �1 m 55 Please use this space to provide any additional information about the wet pond(s): Wet Pond I 11:33 AM 9/20/2021