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HomeMy WebLinkAbout20120227 Ver 1_More Info Received_20120413Coulter Jewell Thames, PA ENGINEERING LAND SURVEYING LANDSCAPE ARCHITECTURE LETTER OF TRANSMITTAL Date 4/11/2012 To NCDWQ Attn Karen Higgins WE TRANSMIT TO YOU HEREWITH # Copies ■ Project The Reserve Sheet No Date Description 4/11/2012 Low Density Supplement 2/18/2012 Cross Section Details Remarks Please let me know if you need anythm9 else Thanks Copies To Daniel A Jewell ASLA RLA James W Thames PE Jeffrey P Williams PLS From Preston Royster PE Main Office 111 West Main Street Durham NC 27701 Phone 919 682 0368 Fax 919 688 5646 Email proyster(ftitpa com lon.,06'�_ "L 7 ECEIVE APR 1 3 2012 Permit No 131— O D- -a-1 (to be provided by DWO State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM LOW DENSITY SUPPLEMENT Tins form may be photocopied for use as an original A low density project is one that meets the appropriate criteria for built upon area and transports stormwater runoff primarily through vegetated conveyances Low density projects should not have a discrete stormwater collection system as defined by 15A NCAC 2H 1002(18) Low density requirements and density factors can be found in Session Law 2008 211, 15A NCAC 2H 1000, Session Law 2006 246, and the DWQ BMP Manual Curb and gutter systems are allowed provided they meet the requirements in 15A NCAC 2H 1008(g) I PROJECT INFORMATION Project Name -?W lkst,K� Contact Person ;01Y FoSf, , gRr Phone Number ( 'ST& ) 5411- Ono Number of Lots Z/ Allowable Built Upon Area (BUA) Per Lot* Zq%l SF �- /t1r;A"J> N ber of Dwelling Units Per Acre ** a ;L �'4w++A' wj& Low Density Development (check one) [] without curb & gutter ❑ with curb & gutter, outlets to (check one) ❑ Swales ❑ Vegetated Area *If lot sizes are not uniform, attach a table indicating the number of lots, lot saes and allowable built upon area for each lot. The attachment must include the project name, phase page numbers and provide area subtotals and totals BUA shall be shown in units of square feet. * *(Phase H Post - Construction (non SA) only) H BUILT UPON AREA Refer to DWQ s forms and applications website for specific language that must be recorded in the restrictions for all subdivided projects (http //h2o enr state nc us /su/bmp_forms htm) Complete the following calculation in the space provided below where • SA Site Area the total project area above Mean High Water DF Density Factor the appropriate percent built upon area divided by 100 RA Road Area the total unpervious surface occupied by roadways Z y uUU w o N O • OA Other Area the total area of impervious surfaces such as clubhouses, teems courts, sidewalks, etc No of Lots the total number of lots in the subdivision • BUA per Lot the computed allowable built upon area for each lot including driveways and impervious surfaces located between the front lot line and the edge of pavement Total allowable lot BUA the computed allowable built upon area for all lots combined Total BUA from lot listing the sum of built upon area allocated for each lot on the list of non uniform lots Form SW401 Low Density Rev 3 2/10/09 Page 1 of 4 Calculation For uniform lot sizes (SA ft2 x DF ) — (RA ft2) — (OA ft2) = BUA per Lot = ft2 (No of Lots ) For non - uniform lot sizes a (SA rn0j, 2 x DF ate) — (RA M%Irft) — (OA 0 ft2) = Total allowable lot BUA b Total BUA from lot listing 75'9Z9L sf b must be :5 a III DESIGN INFORMATION Complete the following table If additional space is needed the information should be provided to the same format as Table 1 and attached to this form Rainfall intensity data can be found in Appendix 8 03 of the State of North Carolina Erosion and Sediment Control Planning and Design Manual or at http //hdsc nws noaa gov/hdsc /pfds/ Table I Swale design information based on the 0-year storm Swale No Drainage Area (ac) Impervious Area (ac) Grassed Area (ac) C Q (cfs ) Slope Vale °w (f ps) V8C1ial (fps) Flow Depth (ft) 1 SEE Mr 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Form SW401 Low Density Rev 3 2/10/09 Page 2 of 4 IV REQUIRED ITEMS CHECKLIST The following checklist outlines design requirements per the North Carolina Administrative Code Section 15A NCAC 2H 1000 NCDENR BMP Manual (2007) Session Law 2006 246 and Session Law 2008 211 Please indicate the page or plan sheet numbers where the supporting documentation can be found An incomplete submittal package will result in a request for additional information This will delay final review and approval of the project Initial in the space provided to indicate that the following requirements have been met and supporting documentation is provided as necessary If the applicant has designated an agent on the Stormwater Management Permit Application Form the agent may initial below If any item is not met, then justification must be attached Only complete items n through p for projects with curb outlets Page/Plan At a minimum, swales are designed to carry the 10 year storm velocity at a non erosive rate Initials Sheet No Swales discharging to wetlands are designed to flow into and through the wetlands at a non NP. a t For projects in the 20 coastal counties Per NCAC 2H 1005, a 50 foot wide vegetative buffer P69 p : k is provided adjacent to surface waters For Redevelopment projects a 30 wide vegetative P, -f _ buffer adjacent surface waters is provided FW P'P 5 b t For HQW or ORW projects outside the 20 coastal counties A 30 foot wide vegetative buffer F,p- I - is provided adjacent to surface waters ?f;R F?-'g c t For Phase H Post Construction projects All built upon area is located at least 30 feet Sit landward of all perennial and intermittent surface waters P 411' wAd Deed restriction language as required on form SWU 101 shall be recorded as a restrictive t Protects in the Neuse, Tar Pamlico, Catawba River basins, and Randleman Lake may require additional buffers covenant A copy of the recorded document shall be provided to DWQ within 30 days of Ud platting and prior to the sale of any lots r3r. A0040e Built upon area calculations are provided for the overall project and all lots N LA f Project conforms to low density requirements within the ORW AEC (if applicable per 15A NCAC 2H 1007) l AtrAtJ+d� Side slopes of swales are no steeper than 3 1, or no steeper than S 1 for curb outlet swales Sig n k6kgbh Longitudinal slope of swales is no greater than 5% for non curb outlet projects calculations for shear stress and velocity are provided if slope is greater than 5% P i — At a minimum, swales are designed to carry the 10 year storm velocity at a non erosive rate 91 Pt_ Swales discharging to wetlands are designed to flow into and through the wetlands at a non D•i - erosive velocity (for this flow requirement into wetlands non erosive is velocity < 2 ft/s) P69 p : k Swale detail and permanent vegetation is specified on the plans Dt- M9 co, : 1 Swale detail provided on plans includes grass type(s) for permanent vegetative cover Saa ►,tcwpm Swales are located in recorded drainage easements t & n tt Length of Swale or vegetated area is at least 100 feet for each curb outlet /A 011 The system takes into account the run off at ultimate built out potential from all surfaces draining to the system (delineate drainage area for each swale) N A. p tt Curb outlets direct flow to a swale or vegetated area t Protects in the Neuse, Tar Pamlico, Catawba River basins, and Randleman Lake may require additional buffers tt Only complete these items for projects with curb outlets Form SW401 Low Density Rev 3 2/10/09 Page 3 of 4 Apr 09 12 03 53p Discount Furniture World V SWALE SYSTEM MAINTENANCE REQUIREMENTS 33bb8442b2 p 1 Mowing will be accomplished as needed according to the season Grass height mill not exceed six inches at any time and grass will not be mowed too close to the ground or scalped 2 Swales will be inspected monthly or after evL ry runoff producing rainfall event for sedunent butld up erosion and trash accumulation 3 Accumulated sediment and trash will be iemoved as necessary Swales will be reseeded or sodded following sediment removal 4 Eroded areas of the swales will be repaired and reseeded Swales will be reLegetated as needed and in a timel) manner based on the monthly inspections Side slopes must be maintained at the permitted slope 5 Catch basins curb cuts velocity reduction de-., ices and piping will be inspected monthly or after every significant runoff producing rainfall event Trash and debris will be cleared awa) from gates, curb cuts velocity reduction devices and piping 6 Swales will not be altered piped or filled ui without approval from NCDENR Division of Water Quality I acknowledge and agree by my signature below that I am responsible for the performance of the six maintenance procedures listed above 1 agree to notify DWQ of any problems with the system or pnor to any changes to the system or responsible party Print Name and Title Address 3s� ~ I Phone � Date Z-- Signature Note The legall} responsible party shou d not tie a humeor hers asmtciattnn Unless more than )0% of Me lots hare been sold and a resident of the subdivision has been mimed ahc presicluit l — —tZ4'1-C.X4 b1G a Notary Public for thc. State of��pyYG [ t c ,� County of do hereby certify that _ i�Lt personally dz� of P y appeared before me this had �Q1� and acMo►tiledge the due execution of the forgoing Swale maintenance requirements Witness ml hand and official seal c06 gNo/sTena to C GOmrn F %P L) s g 6 '2014 Z SEAL AU B\-� �� F 4 tVcE GOB 0 p aA Form SW401 Low Density Rev 3 110109 Vtv commission expires 3 8, .2A 1� Page 4 of 4 ATTACHMENTS REQUIRED ITEMS CHECKLIST — JUSTIFICATION d The deed restriction language from form SWU 101 is not recorded as a restrictive covenant Per a phone conversation with Annette Lucas this language is not required because the allowable built upon area is high It was determined that it is unlikely that the actual built upon area will be close to the allowable value g The side slopes for the swales are 3 1 on the road side of the Swale and 21 on the back side of the swale 2 1 slopes are used to minimize the amount of disturbance The calculations for depth velocity and shear stress have been performed based on the 21 slopes Additional rip rap aprons will be provided at the downstream end of swales 17L 17R 18R and 2011 since they discharge into the wetlands Calculations for the rip rap aprons are attached m All of the swales are located inside of the right of way I.J 9 Lvr-S s Z-1 c % IM WWA,4An�> lVrAL 60 a oc D 23f s tD - �_- � ---- -- = T —7d,71, Sc I LdT DESIGN INFORMATION TABLE 1 DITCH DRAINAGE AREA ACRES IMPERVIOUS AREA ACRES GRASS AREA ACRES RUNOFF COEFF Q(10) FLOW CFS SLOPE (/) VELOCITY ALLOW FPS VELOCITY ACTUAL FPS FLOW DEPTH 1L 010 007 003 076 055 136/6 950 412 023 1R 014 009 005 072 073 140% 950 445 025 2L 076 012 023 036 197 930/ 950 491 040 2R 028 010 015 053 108 51/0 500 337 036 3L 040 008 012 039 112 64% 500 371 035 4L 012 002 004 039 034 20/6 5 00 178 028 5L 064 013 019 039 180 48% 500 375 044 511 014 006 008 058 058 48/o 950 282 059 6L 074 007 067 039 209 18/0 5 00 269 056 611 060 009 042 040 175 40% 500 348 045 7R 160 024 112 040 466 200/ 500 342 074 8L 069 017 052 049 242 320/ 500 347 053 8R 061 009 052 042 186 37% 500 343 047 9L 096 024 072 049 336 32% 500 376 060 10L 101 025 076 049 354 260% 1500 836 041 11L 016 005 011 052 060 113% 950 393 025 11R 054 005 027 034 133 30% 500 291 043 12L 011 003 008 052 041 30% 500 217 027 13L 012 004 008 055 048 70% 500 310 025 13R 067 010 023 036 173 76% 9 50 441 040 14L 004 002 002 064 018 85% 500 261 017 14R 110 011 033 031 249 1 92/o 950 519 044 15L 006 003 003 064 028 28% 500 192 024 15R 146 009 022 026 279 3 1 /o 500 355 056 16L 022 007 015 052 082 88% 950 386 029 16R 040 005 019 036 104 88% 550 410 032 17L 033 010 023 052 123 186% 1050 546 027 17R 045 007 020 037 121 180% 1050 537 027 18R 062 005 017 030 132 155% 950 519 029 19R 034 003 012 032 079 690/ 500 350 030 20R 047 003 014 029 099 168% 950 516 028 21R 088 011 037 035 224 103/o 950 527 041 22L 027 Oil 016 058 1 13 79% 950 402 034 22R 1 024 008 016 055 095 88/ 950 401 031 23L 010 005 005 064 046 17/ 5 00 181 032 23R 022 004 015 044 070 15% 500 191 038 24L 007 004 004 064 032 150/ 500 157 029 24R 006 002 004 058 025 20/ 500 165 025 25L 023 006 014 047 077 97/ 9 50 395 028 25R 011 004 007 058 046 93% 500 341 023 26L 1 040 008 024 043 124 115/ 950 124 032 26R 015 006 009 058 063 130/ 950 4 19 025 27R 133 033 067 045 435 17% 500 317 074 28L 022 009 013 058 092 34% 500 278 036 28R 013 005 008 055 051 33% 500 238 029 29R 010 004 006 058 042 32% 500 2 24 027 30L 1 102 020 061 043 315 1 90/ 1 500 3 05 064 30R 011 004 007 055 043 20% 500 1 89 0 30 31L 030 008 023 049 105 22/o 500 244 041 32L 013 004 009 052 048 150%/. 500 174 033 32R 014 006 008 1 058 058 170/ 500 191 035 33R 007 004 .004 064 032 4 7% 5 00 I 2 41 0 23 U) Z 0 g J Q V O Z c o 000 to 0 to 0 N 0 to M 00 N N° O p M 0000 0 to to to 0 0 00 M 0 W (� N N N M C10 W Cn N W to y y y 0 Ny 00N0Ny C0NNC, M NlAN NNNfn Vi f)U)(AyUyUUU)mV)(1) V1 to NyyN NCQ (n (A Cn fA Cn CACACgcoCAtA fn CA CA CA Z Z Q Z UUUyQQyQQy0U0)Q C0(D9) zyzK�zz� a)rilcow UQyQy00QUyUQyyUUUUUy0000c WOKzR''n C, )c)ggggygU)WI K�� M W J (7 C7 C9 U' U' z U' U' ZC7ZU' U' sy0(QD0U)g0U, <ZZZ2¢OzZz UU' UU' QC7ZZU' Z' (7 (7 (7 (7 (9 C9 C7 C7 (7 a Z2z0C7(7C7QU' Z Z = U OOOZZZZOZZZzzzgozzzozozzoo oz0000zzzzozoozzzzzzzzzz Or to%f) C14 C14 O mmmmOmmmmmm to to to N to to ulNNd OmfDm00]NO]mtn N000N0N0N tnMMtnmtn NNMMNNNNNNUY0N0N0 to to NCD O]mCD to mtn to NN0tn tD 07mmmfDmmlDm to 0ta tnN00M �(7 Z U U AtgC U n ACACnt n n Not'- fACAtgCqCqyyD:yyyyyyfllCAO)fnCq n A n A n- U A n n U n U A A U U U U U n yf AfA( U U A( U U QfAtAfQtQtgfA n n A n U n (gfAtAfnfAlgtAfAyfA(AfA U U n n n n n n NN n n V! a ? 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