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Home My WebLink AboutSW6200704_Supplement-EZ Form_20210209SUPPLEMENT-EZ COVER PAGE 1 FORMS LOADED kasizif i6k . . ............. . . . ..... . ........ .. . ..... . . ...... . ...... . .... .. .. .. .. .. .. .... .... ...... ... ........ ...... .. . .. .. .. .. . ... ..... .. .. .................... .............................. ........ ....... . .. . .......... . .... ... ... . . ...... ........... ..... ................... ... . .. ............ . ...... . . . . . .... . . ........... .. .. . .... . ........ . ....... 1 Project Name .. ..... ... — ___ " , ", ____ -1 - I - -11, 111 ''1 - 11 11 Cypress Pointe - , , "' , '"' , _ __,`___ - "' , , -_ 1 2 Project Area (8c) 50.88 3 CoastaI Wetland Area (ac) 0 S,urf1aqeW4te! Area (ac) 5 ;Is this project High or Low Density? 6 IDoes this project use an off -site SCM? . ..... ...... . .. . .... . ... No NUMBER AND TYPE OF SM.... ... . ...... . . ................ ...... . ... ........ .. ....... . ....... .... .. . .......... . . . . . . . ... ... ...... . . . ............. . .. ..... . ... ....... . s. "77" Infiltration Systern 12 Bioretention C01 13 'Wet Pond 14 Stormwater Wetland 115 iPerTea,bIe_Pavem,ent, 16 il Sand Filter }Rainwater Harvesting (RWH,� 18 IGreen Roof 19 Level Spreader-Filter'Strip (L S- F S) 20 IlDisco nected Impervious Surface (DIS) 21 !Treatment Swale 22 Dry Pond 23 JStormFflter . ..... .. ....... . ....... 24 SilvaCell.. . . ....... ..... ......... 25 Bayfilter .. ...... 26 Filterra VINITAXIIIII)OM MA-01 DESIGNER CERTIFICATION .... me and'Ttle: . ..................... . ...................................... . ................................... . ... . ..... e f f r e y ............. A .... . .... . ........Nobles„ " P E . ..... . . .. . . .... . . ........ . ...... .... . . ....... 28 Organization: Larry King 29 Street address; ,§yute�210111 30 City, State, Zip- Tay 31 Phone n mber(s 910-483-4300 32 Email: jnobles@lkanda.com �C__qT11fiRjtuon_§jt@terrt%nt 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. SEAL 59 Signatu . . ........... Date DRAINAGE AREAS 1 Is this a, hiqh,, q§#y_prqjeqt? Yes 2 so number of drainaqea�r !0§ 2 Does this , 1 prqj ect have low de n s Ity_ areas ? . ............. No 4 If so number of low dense ydrainage areas 0 , s all/part of this project subject to previous rule 5 versions No I E(4 LUA�_i _0kQEP $_RZ_4AGE AlRiix iiF—ORMATION ........... . .. . ...... . ... . ...... . ................. . . . ....... . ... . .. . .. . ... . . . .. . ............ . ........... ...... . .................................................................................... . ...... ....................... . ......... Type of SCM infiltration Basin Infiltration, Basin 5 Total drainac[e area (sq ft) 2216331 , , 829098 6 Onsite drainage areas ft) 22116333 338086 629049 7 'Off,s,it.el,d,lrlal,i,n,age,area (sq ft'), 0 0 0 8 Total BUA in ... . .. . ...... i ct 489491 sf — — . . . 161093 sf . ................. . . . . ..... . ............................. . ... . 324891sf ............. . ............ . . . ......... ..... . ....... I New BUA on subdivided lots (subject to permitting) 9 (sq ft), 364000 sf 124000 sf 240000sf New BUA not on subdivided lots (subject to . ............ . ...... . ....... ...... 10 permitting) (sf) 125491 sf 37093sf 84891 sf OffsiiteBUA (sq sf sf 12 Breakdown of new BUA not on subdivided lots: Pa rklnq (sq ft) sf sf sf sf sf sf 7 Roof (sq 11) sf - Roadwa (sqft�� "Y 121984 sf 37093 sf 8489 1 sf -Futures fti . .............. .. ....... . sf . . ..... _sf ..... ...... ........ ........... ... . .. .sf ... .......... ....... . . Other, please specify in the comment box below (sq fl) sf sf sf New infiltrating permeable pavement on 1 3 1subdividedlots sf sf sf New infiltrating permeable pavement not on 14 subdivided lots (sq ft) sf sf sf Existing BUA that will remain (not subject to �15_ p�ermitti " 9q) (sq ft) sf sf sf, 16 ExisfiN, q1I that already permitted _(sq Tt) sf sf sf 17 Emsting BUA that wall be removed sf sf sf 18 Percent BUA .. ... ........................... . . .. . ........... 22% . . . . . . ........ . .............. ........ 48% . ........ .... ... ... . ... _................... ...... 39% 19 Design storm (inches) 1.0 in 1.0 in 1.0 in Jbe"�gn volume of SCM (cu ft,'�rnn of 13716 cf 27819 cf 21 �dailculaiion method for design volume ...................................................... . ............... . .... . . . ..................... . .............. ........... Simple Method I Simple Method Simple Method 6&'f10_1;_A_LJNV0 "ii6k lease use this space to provide any additional information about the 22 ldrainage areas): INFILTRATION SYSTEM Drama a area numbe 1 2 „�1 2 Minn= reou!,r!d treatmenit volurn c f �BNIffiAlpp 3" rcuG. the M sized to treat the SW from all surfaces at build out? Yes .......... ........... yes 4 jIsthe SCIVI located awayfforn contaminated soils? Yes Yes 5 W I hat are the side slopes ci�f the - S I CM (H:v or enter "Vertical" for trenches)? 3:1 3:1 6 Does the SCIVI have retaining walls, gabion walls or other engineered side slopes? No No 7 Are the inlets, outlets, and receiving stream protected from erosion 10 year storm}? Yes Yes 8 Is there an overflow or bypass for inflow volume in excess of the design volume? lst Yes . .. ......... . ......... . . ............... ..... .. Yes 9 What method for clewatering the SCM for maintenance? Pump (preferred) Pump (pre 10 If ap licable, will the SCIVI be cleaned out after construction? Yes Yes 11 Does the maintenance access comply with General IVIDC (8)? I - Yes Yes 12 the I drai I ln,�%�easeTeqt comply with I Ge I n I e I- ral - IVID I C "1 1 9 - ) ? .... . .........Yes Does 'Yes If the SCIVI is on a single family lot, does (will?) the plat comply with 13 JGeneral IVIDC (10)? 14 Is there an O&M Agreement that complies with General IVIDC (11)? Yes Yes 5 here any is M Plan that complies with G r i 0& �'Y"Dq"(1 2)?, Yes Yes 16 D es! S follow the device specific IVIDC? "e . ... .... . .......... Yes .... . .......... . . . .... . Yes 17 Was the SCIVI desioned bvan NC licensed orofessional? Yes f Yei 18 Prqpqsed"siope of the subgrade surface N 0 t 0% 19 Are terraces o'r'baffles provided? No No 20 T p e of prelrea tment: Forebay Forebay Soils Data 21 , a , s the soil investigated in t I he footprint and at I the elevation of the infiltration system?l �SHWT Yes 22 elevation (fmsl) 118.49 116 514 SHV4per soils report (in)- 112.00 90.00, 24 Ground elevation at boring in soils repo (fmsi) 12404 25 Is a detailed hydrogeologic study attached if the separation is 1 and 2 feet? N/A N/A 26 betvyeen Soil infiltration rate (inih:r) L 00--- -0.60, 2 7 F. Factor of safety �FS) (2 is recommended). 2.00 2.00 Elevations ottom elevation (fmsl) 30 Storage elevation (firnsi) 127.4 ft 120.77 ft 31 Bypass, elevation (frnsi) 127 ft 121 ft For Basins "O"niy" ... . . .... . ..... . . .... ........ .... . ....... 32- 2 �Bottom surface area 5789 ft 33 �Storage elevation surface area 8111.ft 18604.ft J, o, .... . .. ..... .. tenches _q!q_ 36 Perforated pipe diameter, if applicable (inches), 37 Number of laterals 38 Total length of perforated piping, 39 Stone type, rf applicable 40 Stone porosity (`Xo 41 Is stone free of fines? 42 Is hii, stone I I I I I wrapped - I I in I _geotextile I fabric? 11 ......... "[Has ..... . ...... 43 at least one inspection port been provided? Volumes/Drawdown 44 besign volume of SCM (cu ft) Jd046"cf 27955 a 45 CTime to draw down (hours 5�8, hrs 71 hrs 46 Please use this space to provide any additionall information about infiltration systern(s): 127.40' 0 120.80 45. H 157.6 12'170,80 InfilVaboin I 10:00 AM 2/9/2021