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Home My WebLink About20081404 Ver 1_More Info Received_20081229ENVIRONMENTAL SERVICES, INC. 524 S. NEW HOPE ROAD RALEIGH, NORTH CAROLINA 27610 919-212-1760 • FAX 919-212-1707 www.environmentalservicesinc.com December 29, 2008 Ms. Cyndi Karoly NCDWQ - 401/Wetlands Unit 2321 Crabtree Blvd., Suite 250 Raleigh, NC 27604 DEC EIR 2 9 2008 DERR - WATER QUALITY WETLANDS AND STORMWATER BRANCH Re: Lakewood Subdivision DWQ Project # 2008-1404 Ms. Karoly: ESI is submitting this additional information for the above referenced project on behalf of the applicant. The information provided below is in response to your letter dated 21 November 2008. Additional information requested in your November 21 letter was provided by ESI in a submittal dated 11 December 2008. 1. Level Spreader Supplement Form Attached you will find revised data forms for the redesigned pond and for the level spreader as provided by Mack Gay Associates, P.A. Please contact Steven Buie at MGA if you have questions regarding this stormwater information (252) 446-3017. Please note on the attached plan sheets that the project has been slightly reconfigured to allow for a revised design of the level spreader located between Lots 5 & 6. In order to reduce the velocity coming into this level spreader, the overall length of the proposed dredged canal has been shortened by 50 feet. This results in a reduction of the "created buffer area" from 1.25 acres down to 0.89 acre. This 0.89 acre of "created buffer" will comprise 0.47 acre of new Zone 1 and 0.42 acre of new Zone 2. The amount of buffer impact resulting from the canal and the wooden, elevated boardwalk within the limits of the 50-foot buffer is 11,968 ft2 in Zone 1 and 14,134 ftz in Zone 2. The project will create 1.5x the amount of buffer affected by the project (0.89 acre). The buffer creation and planting details were previously submitted to DWQ. I trust that this information will allow NCDWQ to continue processing this application. Please contact me if you have additional questions. Sincerely, ENVIRON ENTAL SERVICES, INC. J7T Jeff Harbour, PWS Asst. Vice President I <4A Cc: Lauren Witherspoon FLORIDA 0 GEORGIA 0 NORTH CAROLINA • SOUTH CAROLINA 9 MARYLAND 0 OHIO Dec 22 2008 11:53AM Mack Gay Associates, P.A. 252-446-7715 A?A Nco" arwA1-tp 3 STORMWATER MANAGEMENT PERMITAPPLICATION FORM 401 CER11FICATIONAPPLICATION FORM LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT TNs form midbe wmpdetelp fled &A printed and aftd sd. DO NOT FORGET TO ATTACH THE REQUIRED ITEMS CHECKIJST AND ALL REQUIRED MEMS (NEXT WORKSHEET)I p.2 r?rq,°r?? now f? -.;•' - name Phonerulrber Dds Dminegeammvim For Level Spreaders RecehArq F w From a BW Type of amp f'1 I Dmwdm tiow from tie BMP For Level Spreaders ReceMno Flow from the Dminmis Area Do ed cum*b ft section dthe wkdoar. Impervlous ask= wee -' ' DOW oompbb fih s"m dit ro Waet Pwoertt hpeMoue % Do W oampleb Qte sedw of ftw sImt RalonalCoosifident ' Doadcdapbb#wmd=dtheeiml 1, t Peak IIOw from ft 1 ittiv don de Do not ammimb ft aeeoe d the earls " Time of coraenbation min RatrdeilirMwWV,10-yrWin WM Do mlconQleblWesectiondBrsatktfiset PedcflowUornfltelfl-yraform da Domwwkbftvmfaaditwwkdwd where Doe the I:" "wet Dlleedarpe? To a grassed bims erffon cef t (Y N) To a mtldted biaetentim oeU? (y or N To a wetland? { ' ry or N) To a tiler strip otripettan bufleR (Y or PNsee aarplebfllrr Mop d?radeib-No baton. S 3.- ?1.r ??AA Rbr Strip or Riparian ishrNv Cheraderfssfion jf applicable) wide of gmaa widhddwiaegroudaover x?`°? 1.7 ft h of wooded veoetatim TOW wkgh Eta dw at dos n*m bees or level tip final Elovdan at top dbw* of fhe momift wder { ? r feel : Slope thorn level ilp to to top of bw*) .. 200 % ON Are any draws preeerrt? s : (Y or N) OK LOW SPuder Daeloe Faebey ambw area : No tfr 8* Y seeded ! Fedd leM Ii needed perds 13 We A www'Y' b one of ft fdlowinp: L angle based on the 1 kft dmm4 rr ' ' • s ? ° (Y or N) l.a gth based an to tQyr stem? "(Y or M Le%ti based on to BMP decharge rate? (Y M Design tow cis Fans SW4ai-LevM 8pneaer, FRw ahtp, Rmft-d R*v&n Bdbr. Rw 5 Page L W U. OWW Sumrry, papa 142 Dec 22 2008 11:53AM Mack Gay Associates, P.A. 252-446-7715 P.3 Is a bypass dwAcs p uwkbd? Lao of to W d lip Am levd gxaadeis In eertew? Bypm Chmmd Dulgn PF appiWOO Down I* blpeew dechatpw through a wetland? Does the drarxtd enter the steam d art ante? Dlmanalortw of d w drerxlal (awe dagram babot m B w y Peak velocity in to dwwW & ft tits 10-yr storm Channal bbg ndeAd N r (YofNj Abypr?drimhnotmodid. fVAWEf :a;, (Y or N) "Aar): a , (Y or m Do not- phd tide aectia arfe rorlrr.at _(YorN) Dordc wpIwftaeedmdfiw=dmhmd Da r,at aonpleM fie ncft dfr 110rk?ltwet -Z " aarrplnte ??+F'?:tt Donut fdtsecUmdthewortnheet ,W'"`?' 1r DonotoonpbAeM -1mdf owk6ek ': At Danotoottplauft dioe df m or1* 0et ''``?+^=`??'"°??? tbnotoonpktetliesedimdthsterkdieet ofs DenoteorrpNlefitseofmdfrelaodoMet Y- TN" DOnetcarpkMtlrilndim atea A Mt 1 r--------- Y_ ---------i 1 M M 1 li l farm SW401-Lacer awnedr, F%w Mt. RedoW itipmea n t3uner4RW.5 Parts I. and 11. DNpt 8tmnry, papa 2 of 2 Dec 22 2008 11:53AM Mack Gay Associates, P.R. 252-446-7715 p.4 Pbase i diicalle the page or plan sheet nwnbers where the vAVo ft doamrsnia Lion can be tbwnd. An kroomplebe submittal package wil result In a requedfor additional information. This wli do* ffnal rsvlew and approval of the pmJect Initial In fine space provided m Indicate The following design requiv m b have been met if tm applea d ha*designaiad on agent, the agerd may kritlal bebw N a requirement has not been nat, aflach Justilledim. Paget Plan InNlale Slat AIM 3 1. Pura [1' - 50' or larger of the e s ells showirp Design at ultimate build-wA - 00-ab drainage (If applICAIS). Dehresl ed drainage basins (include Rational G ooedlcient per basinb - Fambay (If appieable). - ?Hig?h floss bWw" , • Maintenance accessI - Proposed drainage eaeemmnt and pubic rightof way (ROM and - Bma lanes of drainage semen t 2. Plan details (1' = 80' or larger) for the level spreader showing: - Forebay (if applicable), KO flow bypass system, - One toot mope tines behmn the kiwi tip and to p of sheem bank, - Ptaposed drainage sseenwn and - Design at ultimate build-out 3. Section view of the level spreader (V = 20' or larger) showing. - Undwdraln system Of appleabie? - Level Ip, . Upsknpe dnannek and - Dormsiope Ilier fabric LOW f 4? 4. A dsls4 amped pholopiph oftm filler 9* that clearly shows the type of vegetatlon Ihat is present It Ft A`d 5. A o real mcdton seWom that shows how the level spreader will be protected fiom sediment unfit to a-61 wire drainage was Is stabilized. ' MA 8. The supporting c**f & NA A 7. A campy of the signed and notarized operdon and maintenance (C&M) agrosment lift & A copy of the deed rectridone Of required?. Form SNI401-L" Spreader, FiNer Ship, Restored Rrpadan Wer-Re .5 Part III, Page 1 o17 Dec 22 2008 11:54RM Mack Gay Rssociates, P.R. 252-446-7715 p.5 Hydraf low Table of Contents P070a4 LAKE WOOD POND SCS.gpw Hydraflow Hydrographs by Irttelsolve v8.1 Thursday, Dec 18,2W8 Hydrograph Return Period Recap .......................................................................... 1 1 -Year Summary Report .................................................................................................................. 2 Hydrograph Reports .......................................................................................................... 3 Hydrograph No. 1, SCS Runoff, Da-1 Offsite Residential ............................ ........... 3 Hydrograph No. 2, SCS Runoff, Da-2 Offsite Pasture ....................................................... 4 Hydrograph No. 3, SCS Runoff, Da-3 Pond Area ................. .................... 5 Hydrograph No. 4, Combine, Pond ....................... .... . .............. 6 Hydrograph No. 5, Reservoir, ROUTE POND .......................... ... ...... ... 7 Pond Report <New Pond> ......................................................................................... 8 2 - Year Summary Report ................................................... ................................................................ 9 Hydrograph Reports .......................................................................................................... 10 Hydrograph No. 1, SCS Runoff, Da-1 Offsite Residential .................................. Hydrograph No. 2, SCS Runoff, Da-2 Offsite Pasture ................................. 10 Hydrograph No. 3, SCS Runoff, Da-3 Pond Area ......... ........ 12 Hydrograph No. 4, Combine Pond ................................................ ....... Hydrograph No. 5, Reservoir, ROUTE POND ............................................................ 14 10-Year . Summary Report . ............ ................ .......................,....................................................... 75 Hydrograph Reports ... .............. .............. ..................................................................... Hydrograph No. 1, SCS Runoff Da-1 Offsite Residential .. 16 , ................... Hydrograph No. 2, SCS Runoff Da-2 Offsite Pasture , ............................ Hydrograph No. 3, SCS Runoff Da-3 Pond Area , Pond . ........................................................... Hydrograph No. 4, Combine 18 . , Hydrograph No. 5, Reservoir ROUTE POND , .... ........................................................ 20 25 - Year Summary Report ............. ............. ......... Hydrograph Reports . ........................................... ..................................................... 22 ydrograph No. 1, SCS Runoff, Da-1 Offsite Residential ................................. Hydrograph No. 2, SCS Runoff Da-2 •••.••••••••••• ? OfPslte Pasture 22 ..................................................... h N Hydrograp No. 3, SCS Runoff, Da-3 Pond Area 23 . Hydrograph No. 4, Combine, Pond ... 24 .............................................................................. Hydrograph No. 5, Reservoir, ROUTE POND 25 _... ............................................................. 26 100 - Year Summary Report . .......... ................................................................................................. Hydrograph Reports ................ 27 ....,., , ,,, Hydrograph No. 1, SCS Runoff,Da-1Offsite Residential ......................'.........'....'....... ... 28 . . ....•. Hydrograph No. 2 SCS Runoff Da *?"'"""'.. 2 Off i 28 , - s te Pasture ...... ....* ..... Hydrograph No. 3, SCS Runoff, Da-3 Pond Area """"""'"' 2g Hydrograph No. 4 Pond ............................................................ , 30 ....................................................... Hydrograph No. 5 Reservoir, ROUTE POND . . 31 ... . ... Dec 22 2006 11:548M Mack Gab Associates, P.A. 252-446-7715 p.6 • r 1 Hydrograph Return Period Recap H,dmflowHyftgrsphsby hnellsolreY9.1 Dec 22 2008 11:54RM Mack Gay Associates, P.A. 252-446-7715 p.7 2 Hydrograph Summary Report Hydraflow Hydrographs by Intdi6oMe v9.1 Dec 22 2008 11:54AM Mack Gay Associates, P.A. '252-446-7715 P.8 Hydrograph Report 20 Hychftow Hydrogaphs by h bwfve v8.1 Thursday, Dec 78, 2008 Hyd. No. 5 ROUTE POND Hydrograph type = Reservoir. Peak discharge = 2.197 Storm frequency = 10 yrs. = 1122 min Time interval = 1 min Hyd. volume = 220 236 cult Inflow hyd. No. = 4 - Pond Max. Elevation , = 135.30 ft Reservoir name = <New Pond> Max. Storage = 1551248 cult Shwup Ind wdon mettwd Lead. Q (dfs) 35.00ROUTE POND Hyd. No. 5 -10 Year Q (cfs) 35.00 30.0( 25.01 20.00 15.00 10.00 5.00 0.00 0 300 - Hyd No. 5 30.00 25.00 20.00 15.00 10.00 5.00 em 900 1200 1500 1800 2100 2400 2700 30000.00 Hyd No. 4 0 Total storage used = 155,248 cult rime (min) Dec 22 2008 11:47AM Mack Gay Associates, P.H. 252-446-7715 AM?A ! o 's < MOM STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM LEVEL SPREADER, FILTER STRIP AND RESTORED RIPARIAN BUFFER SUPPLEMENT Tft form nut be comple * ftd out printed and stbn tad. DO NOT FORGET TO ATTACH THE REQUIRED MW CNECHUST AND ALL REQUIRED ITEMS (NEXT YI MMHEEn! Project name caltmi mm?e Phase nmitw Deb Dn *mpe ama number P.2 For Level Sp uden Rocdv q Fin From a SMP Type of BASF Dmwdcpwn flow from the BMP For LNW SPaldGm Reoelvlnp Flow from fM Dralnsp Aral Dralnape area %'.." fe S? ?? PeroerRlmpervioua 25.00 % Radonai C ooef dart Y s :7 a? 1 ._7 Peak Now from d,.1 Inihr own t 0.85 ds Time of cortoeralratbaa Rainfd ln*WV.10- elate ;ap?rbft « Fleek In from the 10-yr storm 4.66 aft Where Doea tko fatal Spreader Dis"pe To a gmaxi btoref don cell? (Y or N) To a mulched I>gotatmum wr (Yam) To a MreUand? ` >' ::? I ,` ; (Y a M TO a flier abip or *wm bait ? ' V i:,; a +w rV CY or (? Other (go*) Filler 81wip or Rlpolan Buller Chareotedf:aton (NapplkabhO Wldhdgees •`41, ?1 Widh at dense Bound carer Wk th d wooded vepeta m ToW wkltr ,k tss ;n B&Idm at dairmlope base of level lip {fm 5eV81IM at top of bank of tre retaehlLao water 1.% fmw Sloe {Anal level Np t0 W top of bank) 5.41 % Are any draws preaffig "? (Y or M LawN spreader DOW Faebey swisce area o4 ft Feet d level lp needed perch 27 Mora Ammar 'Y' b one d the ubmw Lamffi based On the 1 iMr dome /y Kz. .1 a M LwO based m to Wyr dwrr1 'g (Y or M Length based m the 8MP ciutw9e rate? (Y or M D*n flow ds Form OW41l1-Lewt SPMNJ r, FMK 8W ReWored RWmn mLdbr- iav.6 MOM tltlr ebtp drecacterbum, babe. OK OK oK Parla I. sad H. 0180 Bu WNW, POP 1,(2 Dec 22 2008 11:47RM Mack Gay Associates, P.A. 252-446-7715 P.3 Is a bypass dwire paAduR Laro of the least Ip Are level gmmdsra In seder? Bypm Chsand Dedpn Otappllrrabk) Does the bypass dle l o n thmugn a wetland? Does to dwnal enter the stream at an ergs? Dinwelorm of the dwnel (sae diagram blew): M B W r Peak velocity in the cMrvW doing the 10 yr dorm Channel lining mater r? x=it;V.T(Yort?) OK +' Wit... \ ::.? I l I ?eedf *0 OK. (y or `y M (y or `0 cfs t - t 1 M M l B l Form SWIMd ever Spada Fier SW. Re ted P4=dm ttdM-Rw.S Pab I. OW U. DGWP 8unmry, pop 2 of 2 Dec 22 2008 11:47AM Mack Gay Associates, P.A. 252-446-7715 p.4 Please h dcaEa the page or plan siteet numbers where the o*pmft dommunfdlon can be bind. An k onpleft submiltel peaksge will rauttIn a requeatfor adcltlonal IM'ormadon. Thla will delay final review and approval of the project. Irdtlat In the apace provided to Indbale the folloisIng design requirerna is have been met If the applmdhas designated an agent, to agent may metal bebwr. If a "Irerowd hss rat been mel, attach Justification. Pagel Plan Inidals hAlF Zmag No. 3 1. Plana (10 - 50' or larger) of the emirs Sloe showleg: - Design at ulimate bufld-0u% - Of IIS d?alnaga {ff appfcab14 - Didnealed drainage basins pnrkxb Rational C ooetlicient per basin), - Forebay (If applaMe), . High flows bypass system, . Mainfenanoe access, • Proposed drainage easemerd and public right of way (110% and - Boundaries of drainage ansement. AAA _ CG- 5" 2. Plan details (V = 30' or larger) for the level spreader showing: - Faebay (W applicable), - High flash bypass system, - One foot topo Ines WON the WW lip and top Of *am bank, - Proposed drainage essemen% and - Design at ulknate bulki•out_ Mir 3. tiealon vises of the level spreader (1• = 2(Y or larger) sinning: - Urrderdrain ayetem (if applcable), - Level Ip, - Upsiops channel, and - DoWdope filler fabrlo. I 1 Mr i?f f t 1?w --?- 3-- oM! t• ato ? • 4. A dab•atamped photograph oft to filter ship that dearly shove the type of vegetation that is posent. S. A cormhollon seenoe 1W shows how the level go spreader will be protected from aedment aril the entlre &* w area is stabilized. mlog 6. The supporting aftlai ons. IVA 7. A copy of the signed and notarized operatloe and mdn* sacs (O&LI agreement '!-[tB. A copy of the deed meticlons (If required). Form SW401-Lwsr SprwxW. Frier Stop, Rmored Rrporfan BuRsr.Rev.9 Part III, pops 1 of 1 Dec 22 2008 11:478M Mack Gay Associates, P.R. 252-446-7715 p.5 Tc= ([ L^3/H ]"0.385 )1128 L= 2210 ft, Longest Length of Travel H= 30 ft, Difference in Elevation Tc= 15.4 min, Time of Concentration Dec 22 2008 11:47AM Mack Gay Associates, P.H. 252-446-7715 p.6 Level Spread Number 1 Inlet Pipe Worksheet for Circular Channel Project Descrip tion Project File j:1phillip%haestad*nw"70044,fm2 W orkshed I-S-1 Inlet Pipe Flow Element Circular Channel Method Manning's Formula Solve For Channel Depth Input Data Mannirgs Coefficient 0.009 Channel Slope 0.010000 ft/R Diameter 6.00 in Discharge 0.85 ds Results Depth 0.44 ft Flow Area 0.18 fr M tted Perimeter 1.21 ft Top Width 0.33 ft Critical Depth 0.45 ft Percent Full 87.23 Critical Slope 0.009=ft/ft velocity 4.68 ft/s Velocity Head 0.34 ft Specific Energy 0.78 ft Froude Number 1.12 Maximum Discharge 0.87 cfs Full Flow Capacity 0.81 ds Full Flow Slope 0.011000111ft Flow is supercritical. 12/11/88 13;63;03 Pry FioWeeler v5.18 Haeebd Meftdo. ino. 37 pnookside Road Vd&*AP ry, CT 04788 (203)755-18= Page 1 of 1 Dec 22 2008 11:47RM Mack Gay Rssociates, P.R. 252-446-7715 p.7 LS-1 BYPASS CHANNEL Worksheet for Trapezoidal Channel Protect Descrip tion Project File j:Wllp;Vwstadit Mpl 70044.fm2 Worksheet LS-1 BYPASS CHANNEL Flow Element Trapezoidal C harmsl Method MarnirVs Formula Save For Charnel Depth Input Date Mannings Coefficient 0.030 Channel Slope 0.054100 ftM Left Side Slope 3.000000 H : V Right Side Slope 3.000000 H : V Bottom Width 1.00 ft Discharge 4.66 cfs Results Depth 0.43 ft Flow Area 0.98 fte Wetted Perimeter 3.71 ft Top Width 3.58 ft Critical Depth 0.54 ft Critical Slope 0.019943 NR Velocity 4.75 ftfs Velocity Head 0.35 ft Specific Energy 0.78 ft Frauds Number 1.80 Flow Is supercritical. 08.37.44 PM Hwsead Methods. inc. W arookside Rorad YV&sww C' W70a F *?/ vof ry. (am) T?18ae page 1 of i