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HomeMy WebLinkAboutSW8090925_CURRENT PERMIT_20200918STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW8 0,?oi ZS DOC TYPE. CURRENT PERMIT ❑ APPROVED PLANS ❑ HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE �-0 Zy ag 1 c) YYYYM M DD DEMLR USE ONLY Date Receiv9d Fee Paid Permit Number r Applicable Rules: ❑ Coastal SW - 1 95 ❑ Coastal SW - 2008 ❑ Ph II - Post Construction (select all that apply) ❑ Non -Coastal SW- HQW/ORW Waters ❑ Universal Stormwater Management Plan ❑ Other WQ M mt Plan: State of North Carolina Department of Environment and Natural Resources Division of Energy, Mineral and Land Resources STORMWATER MANAGEMENT PERMIT APPLICATION FORM This forrn may be photocopied for use as an original I. GENERAL INFORMATION 1. Project Name (subdivision, facility, or establishment name -should be consistent with project name on plans, specifications, letters, operation and maintenance agreements, etc.): Knox Landing 2. Location of Project (street address): Intersection of Camp Knox Road and Boston Road City:MCB Camp Lejeune County:Onslow Zip:28547 3. Directions to project (from nearest major intersection): From Camp I-ejeune Wilson Boulevard right onto Camp Knox Road and left onto Boston Road., 4. Latitude:34° 43' 51" N Longitude:776 23' 27" W of the main entrance to the project. if. PERMIT INFORMATION: 1. a. Specify whether project is (check one): ❑New ®Modification ❑ Renewal w/ Modificationt t Renewals with rrrodifucations also requires SWU-102 - Renewal Application Form b. if this application is being submitted as the result of a modification to an existing permit, list the existing permit numberSW8 090925 , its issue date (if known)AApril 17, 2014 , and the status of construction: ❑Not Started ®Partially Completed* ❑ Completed* *provide a designer's certification 2. Specify the type of project (check one): ❑Low Density ®High Density ❑Drains to an Offsite Stormwater System ❑Other 3. If this application is being submitted as the result of a previously returned application or a Ietter from DEMLR requesting a state Stormwater management permit application, list the stormwater project number, if assigned, and the previous name of the project, if different than currently proposed, 4. a. Additional Project Requirements (check applicable blanks; information on required state permits can be obtained by contacting the Customer Service Center at 1-877-623-6748): ❑LAMA Major ❑NPDES Industrial Stormwater ®Sedimentation/Erosion Control: 47 ac of Disturbed Area 0404/401 Permit: Proposed Impacts b. if any of these permits have already been acquired please provide the Project Name, Project/Permit Number, issue date and the type of each permit:Knox Landing Phase 2, ONSI,0-2014-049, February 7, 2014 Is the project located within 5 miles of a public airport? ®No ❑Yes If yes, see S.L. 2012-200, Part Vl: httl2://portal.ncdenr.org/web/IrZrules-and-regulations Fonn SWU-101 Version Oct. 31, 2013 Page I of �ECEIVED l Saar > > zoos BV:- • � ��r,r•,. � ', :� ,; III. CONTACT INFORMATION 1. a. Print Applicant / Signing Official's name and title (specifically the developer, property owner, lessee, designated government official, individual, etc. who owns the project): Applicant/Organization:Atlantic Marine Corps Communities, LLC (AMCC) Signing Official & Title:Kathleen Murney for Thomas E. Tether, EVP Lend Lease (US) PPP, Inc. b.Contact information for person listed in item I above: Street Address:5401 Maryland Avenue City:Camp Lejeune State:NC Zip:28547 Mailing Address (if applicable): City: State: Zip: Phone: (910 ) 219-6388 Email:kathleen.murney@lendlease.com Fax: (910 ) 219-6309 Please check the appropriate box. The applicant listed above is: ❑ The property owner (Skip to Contact Information, item 3a) ® Lessee* (Attach a copy of the lease agreement and complete Contact Information, item 2a and 2b below) ❑ Purchaser* (Attach a copy of the pending sales agreement and complete Contact Information, item 2a and 2b below) ❑ Developer* (Complete Contact Information, item 2a and 2b below.) 2. a. Print Property Owner's name and title below, if you are the lessee, purchaser or developer. ('Phis is the person who owns the property that the project is located on): Property Owner/Organization: U.S. Department of Defense Signing Official & Title:Neal Paul Deputy_Public Works b. Contact information for person listed in item 2a above: Street Address:1005 Michael Road City:Camp Lejeune State: Mailing Address (if applicable): City: Phone: (910 ) 451-2213 Email:neal.paul@usmc.mil Zip:28542-0004 State: Zip: Fax: (910 ) 451-29-27 3. a. (Optional) Print the name and title of another contact such as the project's construction supervisor or other person who can answer questions about the project: Other Contact Person/Organization: Signing Official & Title: b.Contact information for person listed in item 3a above: Mailing Address: City: State: Zip: Phone: i ) Fax: Email: 4. Local jurisdiction for building permits: Point of Contact: Form SWU-101 Version Oct. 31, 2013 Phone #: Page 2 of 6 ECCIVG MAY f i 2016 BY: IV. PROJECT INFORMATION 1. In the space provided below, briefly summarize how the stormwater runoff will be treated. Stormwater runoff will be conveyed by an underground collection system to three retention ponds. The retention ponds have been designed per NCDENR standards. 2. a. If claiming vested rights, identify the supporting documents provided and the date they were approved: ❑ Approval of a Site Specific Development Plan or PUD Approval Date: ❑ Valid Building Permit Issued Date: ❑ Other: Date: b.If claiming vested rights, identify the regulation(s) the project has been designed in accordance with: ❑ Coastal SW -1995 ❑ Ph Il - Post Construction 3. Stormwater runoff from this project drains to the White Oak River basin. 4. Total Property Area: n/a acres 5. Total Coastal Wetlands Area: 0 acres 6. Total Surface Water Area: 0 acres 7. Total Property Area (4) - Total Coastal Wetlands Area (5) - Total Surface Water Area (6) = Total Project Area,: acres Total project area shall be calculated to exclude the following the normal pool of impounded structures, the area between the banks of streams and rivers, the area belour the Normal Higgh Water (NHW) lime or Mean High Water (MHW) lime, and coastal wetlands landward from the NHW (or MHIN) lime. The resultant project area is used to calculate overall percent built upon area (BUA). Non -coastal zoetlands landward of fire NHW (or MHW) litre may be included in the total project area. 8. Project percent of impervious area: (Total Impervious Area / Total Project Area) X 100 = Varies - see below % 9. How many drainage areas does the project have?3 (For high density, count 1 for each proposed engineered stornavater BMP. For low density and other projects, use I for the rolrole property area) 10. Complete the following information for each drainage area identified in Project Information item 9. If there are more than four drainage areas in the project, attach an additional sheet with the information for each area provided in the same format as Belo er Basin Information Draina e Area 1 Draina e Area 2 Draina e Area 3 Draina e Area _ Receiving Stream Name west Creek Lek Creek Ne�t Creek Stream Class * SC; HQW; NSW SC; HQW; NSW SC; HQW; NSW Stream Index Number* 19-16-3.5 19-16-3.5 19-16-3.5 Total Drainage Area (sf) 1,549,865 649,409 650,127 On -site Drainage Area (sf) 1,549,865 649,409 650,127 Off -site Drainage Area (sf) 0 0 0 Proposed Impervious Area*(so 609,796 231,649 243,284 Impervious Area** total 39 36 37 Impervious- Surface Area Drainage Area 1 Drainage Area 2, Drainage Area 3 Drainage Area _ On -site Buildings/Lots (so 199,158 59,576 90,302 On -site Streets (so 197,614 47,718 85,833 On -site Parking (so 77,335 24,684 40,139 On -site Sidewalks (so 41,812 12,135 15,426 Other on -site (so 19,548 1,584 1,548 Future (so 65,729 51,400 -10,000 Off -site (so 0 28,560 0 Existing BUA*** (so 8,600 51992 0 Total (so: 609,796 231,649 1 243,284 Stream Class and lrrdex Number can be determined at: http://portal.nedcnr.orb=/ioeh/znq[ps/esrr/classi rcatiurrs Impervious area is defined as the built upon area including, but not limited to, bnri =r6rd= Jr si ezrralks, gravel areas, etc. C__ Y� G 'Report only that arrrount of existing BUA that will remain after development. Do i report any existing B !rat is to be removed and which will be replaced by new BUA. MAY 1 1 20i6 Form SWU-101 Version Oct. 31, 2013 Page 3 of 6 BY: � _ ��. C•�� � 'r �� ;{ I I. How was the off -site impervious area listed above determined? Provide documentation. Off -site BUA includes the new imprrvious area of Camp Knox Road off new enh-v road that is outside of the Ground Lease Line. As well as BUA associated with the Knox Landing Comntunit y Center project. BUA was determined from land survey and desi:n drawings by Littlejohn Engineering and others. Pro iects in Union County: Contact t)EMLR Central Qfce stcJf to check if the project is locrued ,rilhin a Threatened d, Endangered Species watershed that may he subjecr to more .stringent stoomi-wer requirements as per 15.4 sVf'AC 02H .0000. V. SUPPLEMENT AND O&M FORMS The applicable state stormwater management permit supplement and operation and maintenance (O&M) forms must be submitted for each BNIP specified for this project. The latest versions of the forms can be downloaded from htW://17ortal.ncdeiir.or£/web/.WLIZIZ Vs/su/bmLt-manual. Vl. SUBMITTAL REQUIREMENT'S Only complete application packages will be accepted and reviewed by the Division of Energy, Mineral and Land Resources (DEMLR). A complete package includes all of the items listed below. A detailed application instruction sheet and BMP checklists are available from httLi://Purt,ii.ncdenr.org/web/%ULL%'_§/su statesw/forins_docs. The complete application package should be submitted to the appropriate DEMLR Office. (The appropriate office may be found by locating project on the interactive online map at hll ortal.ncdenr.or web Jy,1LwsZsuZ ma s.) Please indicate that the following required information have been provided by initialing in the space provide(] for each item. All original documents MUST be signed and initialed in blue ink. Download the latest versions for each submitted application package from htt is L)ortal.ncLienr.or web wLws su statesw forms does. Initials 1. Original and one copy of the Stormwater Management Permit Application Form. -0 2. Original and one copy of the signed and notarized Deed Restrictions & Protective Covenants ,✓�q_ Form. (if required as per part V11 below) 3.. Original of the applicable Supplement Form(s) (sealed, si lied and dated) and O&Nl agreement(s) for each BMP. 4. Permit application processing fee of $505 payable to NCDENR. (For an Express review, refer to -FJ -V— http://www.envhel2 org/pages/onestopexprress.htmi for information on the Express program and the associated fees. Contact the appropriate regional office Express Permit Coordinator for additional information and to schedule the required application meeting.) 5. " A detailed narrative (one to two pages) describing the stormwater treatment/managementfor T_ P the project. This is required in addition to the brief summary provided in the Project Information, item 1. 6. A USGS map identifying the site location. if the receiving stream is reported as class SA or the —4-4— receiving stream drains to class SA waters within'/z mile of the site boundary, include the'h mile radius on the map. 7. Sealed, signed and dated calculations (one copy). D 8. Two sets of plans folded to 8.5" x 14" (sealed, signed, & dated), including: a. Development/Project name. b. Engineer and firm. c. Location map with named streets and NCSR numbers. d. Legend, e. North arrow. f. Scale. g. Revision number and dates. h. Identify all surface waters on the plans by delineating the normal pool elevation of impounded structures, the banks of streams and rivers, the MHW or NHW line of tidal waters, and any coastal wetlands landward of the MHW or NHW lines. • Delineate the vegetated buffer landward from the normal pool elevation of impounded structures, the banks of streams or rivers, and the MHW (or NFI W) of tidal waters. i. Dimensioned property/ project boundary with bearings & distances. j. Site Layout with all BUA identified and dimensioned. k. Existing contours, proposed contours, spot elevations, finished floor elevations. I. Details of roads, drainage features, collection systems, and stormwater contr �e Do — MAY 1 12016 Form S W U-101 Version Oct. 31, 2013 Page 4 of 6 BY: ���� � '� ;if M. M2[1,111ris delineated, or a note on the plans that none exist. (,lust be delineated by a qualified person. Provide documentation of qualifications and identify the person who made the determination on the plans. n. Existing drainage (including off -site), drainage easenien'.s, pipe sizes, runoff calculations. o. Drainage areas delineated (included in the rain set of plans, not as a separate document). p. Vegetated buffers (where required). Copy of any applicable soils report with the associated SHIVT elevations (Please identify elevations in additian to depths) as well as a map of the boring locations with the existing elevations and borim, logs. Include an 85'xll" copy, of the NRCS County Soils map %with the project area clearly delineated. For projects with infiltration 13i41Ps, the report should also include the soil type, expected infiltration rate, and ilhe method of determining the infiltration rate. (Infiltration Devices submitted to MRO: Schedule n site visit fir I?EMLP to ver7hj fire SHM- prior fo Subniltnl, (910) 795-7375.) 10. A copy of the most current property deed. Deed book: Page No: 11. For corporations and limited liability corporations (LI.C): Provide documentation from the NC: Secretary of State ur other official d0C1l1l1erltatiMl, which supports the titles and positions held by the persons listed in Contact Information, item'la, 2a, and/or 3a per 15A NCAC 21-1.1003(e). The corporation or LLC must be listed as an active corporation in good standing with the NC Sccrelary of State, otherwise the application will be returned. http://www.�et rotary.state.nc.us/Corporations/CSearcfz aspx VI1, DEED RESTRICNONS AND PROTECTIVE COVENANTS For all subdivisions, outparcels, and future development. the appropriate property restrictions and protective covenants are required to be recorded prior to the sale of any lot. If lot sizes vary significantly or the proposed RUA allocations vary, a table listing each lot number, lot size, and the allowable built-tspon area must be provided as an attachment to the completed and notarized deed restriction form. `the appropriate deed restrictions and protective covenants forms can be downloaded from http !f},orhl.ncdenr.csr /'•ti'i`h'lr/state-storm,.valer tornis C10C.s. Downlnad the latest versions for each submittal. In the instances where the applicant is different thirn the property owner, it is the responsibility of the property owner to sign the deed restrictions and protective covenants form while the applicant is responsible for ensuring that the deed restrictions are recorded. By the notarized signahrre(s) below, the permit holder(s) certify that the recorded property restrictions and protective covenants for this project, if required, shall include all the items required in the permit and listed on the forms available on the website, that the covenants will be binding on all parties and persons claiming under them, that they will run with the land, that the required covenants cannot be changed or deleted without concurrence from the NC DENiLR, and that they will be recorded prior to the sale of any lot. VIII. CONSULTANT INFORIIATION AND AUTHORIZATION Applicant: Complete this section if you wish to designate authority to another individual and/or firm (such as it consulting engineer and/or firm) so that they may provide information on your behalf for this project (such as addressing requests for additional information). Consulting Engines>r:Thomas_1. Davis Consulting Firim Littlejohn n Engineering Associaies Mailing Address:1935 Twenty -First Avenue South City:Nashville State:TN Zip:37212 Phone: (615 1 38S-144 Fax: (613 ) 385-1020 >;mail:tdavis'�?lc:rinc.com IX. PROPERTY OWNER AUTHORIZATION (if Contact Inforwtion, item 2 has been filled out, complete this section) pp I, (print or type name of person listed in Contact Information, item 2a) n nrria Dj� ,xo _, certify that i own the property identified in this permit application, and thus give permission to (print or type name of person listed in Contact Information, item Ira) Kathleen Murney with (print or type noon of orgar+ization listed in Contact Information, iterrr 1a) AMCC to develop the project as currently proposed. A copy of the lease agreement or pending property sales contract has been provided with the submittal, which indicates the party responsible for the operation and neairrtenance of the sturmwater system. E C E I Sj� Form SWIJ-101 Version Oct. 3 I, 20 [ 3 Pugs 5 of 0 SAY 1 1 Zfl1� ... BY: As the legal property owner 1 acknowledge, understand, and agree by my signature below, that if my designated agent (entity listed in Contact Information, item 1) dissolves their company and/or cancels or defaults an their lease agreement, or pending sale, responsibility for compliance with the DEMLR Stormwater permit reverts back to me, the property owner. As the property owner, it is my responsibility to notify DEMLR immediately and submit a completed Name/Ownership Change Form within 30 days; otherwise I will be operating a stormwater treatment facility without a valid permit. I understand that the operation of a stormwater treatment facility without a valid permit is a violation of NC General Statue 143-215.1 and may result in appropriate enforcement action including the assessment f civil penalties -f up to $�,000 per day, pursuant to NCGS 143-215.6, Signatu Date: 5,O—ZL6 [,11ii�• ��` 1+� a Notary Public for the State of County of l71 lo�V'N� do hereby certify that personally appeared before me this Q� day of , and a knowledge the due execution of the application for a stormwater permit. Witness my hand and official sea \\\��s��t r rSrq irrr�E ii Notary Public r Onslow County -My Commission Expires= 05/26/2019 oRrH X. APPLICANT'S CERTIFICATION SEA1_ — 1­0 - My commission expires oC� I, (print or hfpe nrrrne of person listed in Contact Information, item 1a) Kathleen Murney, for Thowas E. Tether, EVP Lend Lease (LIS) PPP, Inc. certify that the information included on this permit application form is, to the best of my knowledge, correct and that the project will be constructed in conformance with the approved plans, that the required deed restrictions and protective covenants will be recorded, and that the proposed project complies with the requirements of the applicable stormwater rules under 15A NCAC 214 .1000 and any other applicable state stormwater requirements. Signature: Date: a Notary Public for the State of _ _ County of , do hereby certify that before me this _ day of personally appeared and acknowledge the due execution of the application for a stormwater permit. Witness my hand and official seal, SEAL My commission expires ECGI V E MAY 1 1 2016 BY: Form S W U-101 Version Oct. 31, 2013 Pale 6 of 6 a As the legal property owner I acknowledge, understand, and agree by my signature below, that if my designated agent (entity listed in Contact Information, item 1) dissolves their company and/or cancels or defaults on their lease agreement, or pending sale, responsibility for compliance with the DEMLR Stormwater permit reverts back to me, the property owner. As the property owner, it is my responsibility to notify DEMLR immediately and submit a completed Name/Ownership Change Form within 30 days; otherwise I will be operating a stormwater treatment facility without a valid permit. I understand that the operation of a stormwater treatment facility without a valid permit is a violation of NC General Statue 143-215.1 and may result in appropriate enforcement action including the assessment of civil penalties of up to $25,000 per day, pursuant to NCGS 143-215.6. Signature: a Notary Public for the State of do hereby certify that before me this _ day of Date: County of personally appeared and acknowledge the due execution of the application for a stormwater permit. Witness my hand and official seal, SEAL My commission expires X. APPLICANT'S CERTIFICATION I, (print or type name of person listed in Contact lnforrnation, ilern 1a) Kathleen Murney, for Thomas E. Tether, EVP Lend Lease (US) PPP, lice. _ _ certify that the information included on this permit application form is, to the best of my knowledge, correct and that the project will be constructed in conformance with the approved plans, that the required deed restrictions and protective covenants will be recorded, and that the proposed project complies with the requirements of the applicable stormwater rules under 15A NCAC 211 .1000 and any other applicable state stormwater requirements. Signature: 6 i _dL/ Date: i'Y 6 l (p" I, JI�iAAnafj . Jh� c a Notary Public for the State of 01n)S I01A-) ouuntty�Y� do hereby certify that ��� eA M UUk personally appeared before me this 5 day of C' �04and cknowledge the due Au tion t applicati for„ a stormwater permit. Witness my hand and official eal, c `\��14V1lil/� :o 1°.U8LIC iOh, 6OUO s Form S W U-101 Version Oct. 31, 2013 SEAL My commission expires l D ECEI V E MAY ig20l5 Page 6 of 6 t Permit No. \1r p 0g07 a 5 (ro be provided by DWQJ AOF WA7�9 O� QG `, (ij 9 NCDENR STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM WET DETENTION BASIN SUPPLEMENT This form must be filled out, printed and submitted. The Required items Checklist (Part 111) must be printed, filled out and submitted along with all of the required information I: ,PROJECT INFORMATION,., ;,, y. t . N Proname Kno x ox Landing Contact person Thomas J. Davis, P.E. Phone number 615-365-4144 Date 1/2812011 Drainage area number 1 II. DESIGN INFORMATION Site Characteristics Drainage area 1,549,865 ft' Impervious area, post -development 609,796 ft2 % impervious 39.35 Design rainfall depth 1,5 in Storage Volume: Non -SA Waters Minimum volume required Volume provided Storage Volume: SA Waters 1.5" runoff volume Pre -development 1-yr, 24-hr runoff Post -development 1-yr, 24-hr runoff Minimum volume requires Volume provided Peak Flow Calculations Is the pre/post control of the 1yr 24hr storm peak flow required? 1-yr, 24-hr rainfall depth Rational C, pre -development Rationa! C, post -development Rainfall intensify: 1-yr, 24-hr storm Pre -development 1-yr, 24-hr peak flow Post -development 1-yr, 24-hr peak flow Pre/Post 1-yr, 24-hr peak flow control Elevations Temporary pool elevation Permanent pool elevation SHWT elevation (approx. at the perm. pool elevation) Top of 1 Oft vegetated shelf elevation Bottom of 1 Oft vegetated shelf elevation Sediment cleanout, top elevation (bottom of pond) Sediment cleanout, bottom elevation Sediment storage provided Is there additional voiume stored above the state -required temp. pool? Elevation of the top of the additional volume 78,289 ft' 80,912 ft' ft3 ft3 ft3 ft3 ft, OK OK, volume provided is equal to or in excess of volume required. X Y (Y or N) 3,6 in 0.40 (unitless) 0.65 (unitless) 0.15 inihr OK 2.13 ft'fsec 3.47 ft3lsec 1.34 ii'isec 9.70 fmsl 8.20 fmsl 8.67 fmsl 8.70 fmsl 7.70 fmsl 2,00 fmsl 1,00 fmsl 1.00 ft (Y or N) fmsl rcr�r�� JAN 2 8 �� Fgrm SW401-Wet Delenlion Basin-Rev_8-9!17109 Paris I. & 11. Design Summary, Page 1 of 2 Permit No. (to be provided by OWO) lu 1k.:DESIGN INFORMATION,. ,` ,, ,�;:.� •9 _ ,_,.. -', . ,�� .. �- �, • ;, E Surface Areas Area, temporary pool 60,690 ft' Area REQUIRED, permanent pool 42,466 ft' SAIDA ratio 2.74 (unilless) Area PROV0ED, permanent poci. Pwm ocd 45,902 ll� OK Area, bottom of 1Oft vegetated shelf, fro, y,w 40,213 ft' Area, sediment cleanout, top elevation (bottom of pond), &, 1—d 24,668 fe Volumes Volume, temporary pool 80,912 ft' OK Volume, permanent pool, , 204.634 ft' Volume, forebay (sum of forebays if more than one forebay) 38,016 rya Forebay % of permanent pool volume 18.6% % OK SAIDA Table Data Design TSS remova 90 % Coastal SAIDA Table Used, Y (Y or N) MountainlPiedmont SAIDA Table Used' N (Y or N) SAIDA ratio 2.74 (unitless) Average depth {used in SAIDA table}: Calculation option 1 used? (See Figure 10-2t N (Y or N} Volume, permanent pool, perm_pcd 204,634 ft' Area provided, permanent pool, �e m 45.902 ft' Average depth calculates ft Need 3 ft min, Average depth used in SAIDA, 0,, (Round to nearest 0 5h) ft Calculation option 2 used? (See Figure 10-2t Y (Y or N) Area provided, permanent pool, ' .,_v_, 45,902 ft' Area, bottom of 1 Oft vegetated shell, A, 5,,,:,, 40.213 ft` Area, sediment cleanout, top elevation (bottom of pond), k roe,, 24,668 ft' "Depth" (distance blw bottom of 10ft shelf and top of sedimen 5.70 ft Average depth calculate[ 5.07 ft OK Average depth used in SAIDA, q , (Round to nearest O.Sft) 5.0 ft OK Drawdown Calculations Drawdown through orifice? Y (Y or N) Diameter of orifice (if circular; 4 00 in Area of orifice (it -non -circular) in' Coefficient of discharge (C.) 0.60 (unitless) Driving head K) 1.37 It Drawdown through weir? (Y or N) Weir type (unitless) Coefficient of discharge (C) (unitless) Length of weir (L} ft Driving head (H) ft Pre•develcpment 1-yr. 24-hr peak flow 2.13 ftlisec Post -development 1-yr. 24-hr peak flow 3.47 ftlisec Storage volume discharge rate (through discharge orifice or weir) 0.28 ftlisec Storage volume drawdown time 3.19 days OK, draws down in 2-5 days. Additional Information Vegetated side slopes 4 A OK Vegetated shelf slope 10 :1 OK Vegetated shelf width 10.0 it OK Length of flowpath to width ratio 3 .1 OK Length to width ratio 3.5 :1 OK Trash rack for overflow & orifice? Y (Y or N? OK Freeboard provided 1.5 it OK Vegetated filler provided? N (Y or N) OK Recorded drainage easement provided? N (Y or N) Insufficient. Recorded drainage easement required. Capures all runoff at ultimate build -out? Y (Y or N) OK Drain mechanism for maintenance or emergencies is Pump out for mainte innro and-Dvedow.weir for�rnerg_ ' s Form SW40i-Wet Detention Basin-Rev.8-9ii7/09 .) JAN Parts I, 8 II- Design Summary, Page 2 of 2 FEW R Permit No. (to be provided by DWQ) ill. REQUIRED ITEMS'CHECKLIST' k 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 the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a requirement has not been met, attach justification. Pagel Plan Initials Sheet No. "TI—P Rrnr,� 1. Plans (1" - 50' or larger) of the entire site showing: Design at ultimate build -out, Off -site drainage (if applicable), Delineated drainage basins (include Rational C coefficient per basin), Basin dimensions, Pretreatment system, High flow bypass system, Maintenance access, Proposed drainage easement and public right of way (ROW), Overf!ow device, and Boundaries of drainage easement. -A C-5.oz V 2. Partial plan (1" = 30' or larger) and details for the wet detention basin showing: G-6.08 Outfet structure with trash rack or similar, Maintenance access, Permanent pool dimensions, Forebay and main pond with hardened emergency spillway, Basin cross-section, Vegetation specification for planting shelf, and Filter strip. ��--p C-5.08 3. Section view of the wet detention basin (1" = 20' or larger) showing Side slopes, 3:1 or lower, Pretreatment and treatment areas, and Inlet and outlet structures. 4. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified r� on the plans prior to use as a wet detention basin. 5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for Forebay, to verify volume provided. g. A construction sequence that shows how the wet detention basin will be protected from sediment until the entire drainage area is stabilized. IN D 7. The supporting calculations. PrrTlcA46 8. A copy of the signed and notarized operation and maintenance (0&M) agreement. NAA 1 9. A copy of the deed restrictions (if required). _ Pi7Ncts- a 10. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. County soil maps are not an acceptable source of soils information. Form 5W401-Wet Detention Basin -Rev.8-9117/09 RECEIVED JAN 0 7 2011 BY: Part III. Required Items Checklist, Page 1 of 1 Permit Number: W�, 09tR UC:J (to be proi,ided by DWQ) Drainage Area Number: Wet Detention Basin Operation and Maintenance Agreement I will keep a maintenance record on this BMP. This maintenance record will be kept in a log in a known set location. Any deficient BMP elements noted in the inspection will be corrected, repaired or replaced immediately. These deficiencies can affect the integrity of structures, safety of the public, and the removal efficiency of the BMP. The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the vegetated filter if one is provided. This system (check one): ❑ does ® does not incorporate a vegetated filter at the outlet. This system (check one): ❑ does ® does not incorporate pretreatment other than a forebay. Important maintenance procedures: — Immediately after the wet detention basin is established, the plants on the vegetated shelf and perimeter of the basin should be. watered twice weekly if needed, until the plants become established (commonly six weeks). — No portion of the wet detention pond should be fertilized after the first initial fertilization that is required to establish the plants on the vegetated shelf. — Stable groundcover should be maintained in the drainage area to reduce the sediment load to the wet detention basin. — If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain should be minimized to the maximum extent practical. — Once a year, a dam safety expert should inspect the embankment. After the `net detention pond is established, it should be inspected once a month and within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal County). Records of operation and maintenance should be kept in a known set location and must be available upon request. Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately. BMP element: Potentialproblem- How I will remediate theproblem: The entire BMP `]'rash/debris is present. Remove the trash/debris. The perimeter of the wet Areas of bare soil and/or Degrade the soil if necessary to detention basin erosive gullies have formed. remove the gully, and then plant a ground cover and water until it is established. Provide lime and a one-time fertilizer application. Vegetation is too short or too Maintain vegetation at a height of long. approximately six inches. Dorm SW401-Wet Detention Basin O&M-Rev.4 .RECEIVED JAN 0 7 2011 BY: Page I of 4 Permit Number: (to be provided by DWQ) Drainage Area Number: BMP element: Potential roblem: How Vwill remediate the problem, The inlet device, pipe or The pipe is clogged. Unclog the pipe. Dispose of the Swale sediment off -site. The pipe is cracked or Replace the pipe. otherwise damaged. Erosion is occurring in the Regrade the Swale if necessary to Swale. smooth it over and provide erosion control devices such as reinforced turf matting or riprap to avoid future problems with erosion. The forebay Sediment has accumulated to Search for the source of the a depth greater than the sediment and remedy the problem if original design depth for possible. Remove the sediment and sediment storage. dispose of it in a location where it will not cause impacts to streams or the BMP. }-rosion has occurred. Provide additional erosion protection such as reinforced tUrf matting or riprap if needed to prevent future erosion problems. Weeds are present. Remove the weeds, preferably by hand. If pesticide is used, wipe it on the plants rather than spraying. The vegetated shelf Best professional practices Prune according to best professional show that pruning is needed practices to maintain optimal plant health. Plants are dead, diseased or Determine the source of the dying. problem: soils, hydrology, disease, etc. Remedy the problem and replace plants. Provide a one-time fertilizer application to establish the ground cover if a soil test indicates it is necessary. Weeds are present. Remove the weeds, preferably by hand. If pesticide is used, wipe it on the plants rather than spraying. The main treatment area Sediment has accumulated to Search for the source of the a depth greater than the sediment and remedy the problem if original design sediment possible. Remove the sediment and storage depth. dispose of it in a location where it will not cause impacts to streams or the BMP. Algal growth covers over Consult a professional to remove 50% of the area. and control the algal growth. Cattails, phragmites or other Remove the plants by wiping them invasive plants cover 50% of with pesticide (do not spray). the basin surface. JY.AN 0 7 2011 Form SW401-Wet Detention Basin O&M-Rev.4 Page 2 of 4 � Permit Number: (to be provided bY DIGQ) Drainage Area Number: BMP element: Potentialproblem: How I will remediate theproblem: The embankment Shrubs have started to grow Remove shrubs immediately. on the embankment. Evidence of muskrat or Use traps to remove muskrats and beaver activity is present. consult a professional to remove beavers. A tree has started to grow on Consult a dam safety specialist to the embankment. remove the tree. An annual inspection by an Make all needed repairs. appropriate professional shows that the embankment needs repair. if applicable) The outlet device Clogging has occurred. Clean out the outlet device. Dispose of the sediment off -site. The outlet device is damaged Repair or replace the outlet device. The receiving water Erosion or other signs of Contact the local NC Division of damage have occurred at the Water Quality Regional Office, or outlet. the 401 Oversight Unit at 919-733- 1786. The treasuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments. When the permanent pool depth reads 6.2 feet in the main pond, the sediment shall be removed. When the permanent pool depth reads 6.2 feet in the forebay, the Sediment - shall be removed. Sediment Removal I - A. 2,00 1 ---------------- Bottom Elevatiol 1.00 1 FOREBAV BASIN DIAGRAM (fill in the blank-.,;) Permanent I'M Elevation 8.20 'e rnanen Pool Volume _ Sediment Removal Elevation 2.00 Volume ftMin.---------- ------ Sediment Storage Form SW401-Wet Detention Basin O&M-Rev.4 Bouoni Elevation MAIN POND .1AN07 2411 1 -�� Page 3 of 4 1-ft Iv 11. Sediment Storage Permit Number: (to be providetl by DI,VQ) I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Project nanie:Knox Landin BHP drainage circa m ntber Print name:Atlantic Marine Corps Communities, LLC (AMCC) Title:Chris Craig for Thomas E. Tether, SVP Lend Lease Americas, Inc. Address.1801 West End Avenue Suite 1700 Nashville, TN 37203 Phon, S i gtt ti Date: Note: The legally responsible party should not be a homeowners association unless more than 50`%, of' the lots have been sold and a resident of the subdivision has been named the president. a Notary Public for the State of County of �- -N.5 , do hereby certify that C -Q.eSTDPti�'� &14(1 s- personally appeared before me this �= l clay of Oo1 e- �+� _ 40to , and acknowledge the clue execution of the forgoing w etention basin maintenance requirements. Witness my hand and official seal y,lllllli1111!// �RICI,q -, o' ""0 •11.11� Nrr VEN ',//111'11111111,, SEAL My commission expires .J� ' 7 Form allSW401-Wet Detention Basin OEM-Rev.4 t r -.f . Page 4 of 4 u `' ,�; Permit Noa7C)�G� %��] (to be prowled by QWQ) APA mot. ti R r�9 NCDENR STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM WET DETENTION BASIN SUPPLEMENT This form mast be filled out, printed and submitted. The Required Items Checklist (Part III) must be printed, filled out and submitted along with all of the required information. I. PROJECT INFORMATION Project name Knox Landing Contact person Tom Davis, PE Phone number 615-385-4144 Date 51212016 Drainage area number 2 - North Pond IL ,DESIGN INFORMATION Site Characteristics Drainage area 649,409 ft? Impervious area, post -development 231,649 ft' % impervious 35.67 % Design rainfall depth 1.5 in Storage Volume; Non•SA Waters Minimum volume required 301119 ft, Volume provided ,30,493 ft3 OK, volume provided is equal to or in excess of volume required, Storage Volume: SA Waters 1.5" runoff volume It Pre -development 1-yr, 24-hr runoff ft3 Post -development 1-yr, 24-hr runoff ft3 Minimum volume required ft3 Volume provided @3 Peak Flow Calculations Is the prelposl control of the 1yr 24hr storm peak flow required? N (Y or N) 1-yr, 24-hr rainfall depth 3.6 in Rational C, pre -development 0.40 (unitless) Rational C. post -development 0.65 (unibess) Rainfatt intensity: 1-yr, 24-hr storm 0.15 inthr OK Pre -development 1-yr, 24-hr peak flow 0,70 ft3Isec Post -development 1-yr, 24-hr peak flow 1.14 ft'lsec PrelPost 1-yr, 24-hr peak flow control 0.44 ft3lseo Elevations Temporary pool elevation 8,75 fmsl Permanent pool elevation 7.50 fmsl SHWT elevation (approx. at the perm. pool elevation) 7.50 fmsl Top of 1Oft vegetated shelf elevation 8.00 fmsl Bottom of 1Oft vegetated shelf elevation 7.00 fmst Sediment cleanout, top elevation (bottom of pond) 2.00 fmsl MAY E4�r~'li V 112016 Sediment cleanout, bottom elevation 0.00 fmsl Sediment storage provided 2.00 ft Is there additional volume stored above the state -required temp. pool? N (Y or N) BY: Elevation of the top of the additional volume fmsl Form SW401-Wet Detention Basin-Rev.9-411et12 Parts I. & It. Design Summary, Page 1 of 2 F w w � ` r.. �i � ......'� '' F . Z' ' .�. . � ,i Permit No. (to he provided b y DWQ) II. DESIGN INF0RMATION Surface Areas ' Area, temporary pool 26,531 ft' Area REQUIRED, permanent pool 20,482 It' SAIDA ratio 3.15 (unitless) Area PROVIDED, permanent pool, Ap,r,-pod 21,111 ft' OK Area, bottom of 10ft vegetated shelf, A „ h 16,883 ft' Area, sediment cleanoul, top elevation (bottom of pond), Ah„_�,d 7,650 Rz Volumes Volume, temporary pool 30,493 it' OK Volume, permanent pool, Vp, , , 64,419 JO. Volume, forebay (sum of forebays if more than one forebay) 14,090 ft' Forebay % of permanent pool volume 21.9% % OK SAJDA Table Data Design TSS removal 9D % Coastal SAIDA Table Used? Y (Y or N) MountainlPiedmont SAIDA Table Used? N (Y or N) SAlDA ratio 3.15 (unitless) Average depth (used in SAIDA table): Calculation option 1 used? (See Figure 10.2b) N (Y or N) Volume, permanent pool, Vp,- ,, 64,419 ft' Area provided, permanent pool, Ap,,,,,_p,a 21,111 R2 Average depth calculated ft Need 3 ft min. Average depth used in SA1DA, d_ (Round to nearest 0.5ft) R Calculation option 2 used? (See Figure 10-2b) Y (Y of N) Area provided, permanent pool, Ap, pw 21,111 ft2 Area, bottom of 10ft vegetated shelf, Ate, ,hei, 16.883 f112 Area, sediment cleancut, lop elevation (bottom of pond), Awl pod 7,650 ft2 "Depth" (distance bfw bottom of.10ft shelf and top of sediment) 5.00 ft Average depth calculated 4.08 ft OK Average depth used in SA1DA, d,,, (Round to down to nearest 0.5ft) 4.0 ft OK Drawdown Calculations Drawdown through orifice? Y (Y or N) Diameter of orifice (if circular) 2.50 in Area of orifice (if -non -circular) in' Coefficient of discharge (Co) 0,60 (unitless} Driving head (Ho) 0,42 ft Drawdown through weir? N JY or N) Weir type (unitless) Coefficient of discharge (C�} (unitless) Length of weir (L) R Driving head (H) It Pre -development 1-yr, 24-hr peak flow 0,70 ft'lsec Post -development 1-yr, 24-hr peak flow 1.14 ft'lsec Storage volume discharge rate (through discharge orifice of weir) 0.11 R'lsec Storage volume drawdown time 3.29 days OK, draws down in 2.5 days. Additional Information Vegetated side slopes Vegetated shelf slope Vegetated shelf width Length of flowpath to width ratio Length to width ratio Trash rack for overflow & orifice? Freeboard provided Vegetated filter provided? Recorded drainage easement provided? Capures all runoff at ultimate build -out? Drain mechanism for maintenance or emergencies is: 4:1 OK In ECEIVE 10 :1 OK '°. it OK MAY 1 1 ' 2016 3 :1 3 OK 3.4 ;1 OK Y (Y or N) OK BY: 1.0 R OK N (Y or N) OK N (Y or N) Insufficient. Recorded drainage easement required. Y (Y or N) OK Pump out for maintenance and overflow weir for emergencies Form SW401-Wet Detention Basin-Rev.9-4119112 Parts 1. S 11. Design Summary, Page 2 of 2 Permit Number: -S5, ofz 9 (to he prov{,41ed by DI11Q) Drainage Area Number: Wet Detention Basin Operation and Maintenance Agreement l will keep a maintenance record on this BMP. This maintenance record will be kept in a log in a known set location. Any deficient BMP elements noted in the inspection will be corrected, repaired or replaced immediately. 'Fhese deficiencies can affect the integrity of structures, safety of the public, and the removal efficiency of the BMP. The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the vegetated filter if one is provided. This system (check one): [] does ® does not incorporate a vegetated filter at the outlet. This system (check one): ❑ does ® does not incorporate pretreatment other than a forebay. Important maintenance procedures: — Immediately after the wet detention basin is established, the plants on the vegetated shelf and perimeter of the basin should be watered twice weekly if needed, until the plants become established (commonly six weeks). — No portion of the wet detention pond should be fertilized after the first initial fertilization that is required to establish the plants on the vegetated shelf. — Stable groundcover should be maintained in the drainage area to reduce the sediment load to the wet detention basin. — if the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain should be minimized to the maximum extent practical. — Once a year, a dam safety expert should inspect the embankment. After the wet detention pond is established, it should be inspected once a month and within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal County). Records of operation and maintenance should be kept in a known set location and must be available upon request. Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately. BMP element: Potentialproblem.- How I will remediate theproblem: The entire BMP "Crash/debris is present. Remove the trash/debris. The perimeter of the wet Areas of bare soil and/or Regrade the soil if necessary to detention basin erosive gullies have formed. remove the gully, and then plant a ground cover and water until it is established. Provide lime and a one-time fertilizer application, Vegetation is too short or too Maintain vegetation at a height of long. approximate y six inches. Form SW401-Wet Detention Basin O&M-Rev.4 `OCT 2 8 2013 BY: — Page I of 4 Permit Number: (to be provided by UIVQ) Drainage Area Number: BMP element: Potential roblem: How I will remediate theproblem: The inlet device: pipe or The pipe is clogged_ Unclog the pipe_ Dispose of the Swale sediment off -site. The pipe is cracked or Replace the pipe. otherwise damaged. Erosion is occurring in the Regrade the Swale if necessary to Swale. smooth it over and provide erosion control devices such as reinforced turf matting or riprap to avoid future problems with erosion. The forebay Sediment has accumulated to Search for the source of the a depth greater than the sediment and remedy the problem if original design depth for possible. Remove the sediment and sediment storage., dispose of it in a location where it will not cause impacts to streams or the BMP. Erosion has occurred. Provide additional erosion protection such as reinforced turf matting or riprap if needed to prevent future erosion problems. Weeds are present, Remove the weeds, preferably by hand. If pesticide is used, wipe it on the plants rather than spraying. The vegetated shelf Best professional practices Prune according to best professional show that pruning is needed practices to maintain optimal plant health. , Plants are dead, diseased or Determine the source of the dying, problem: soils, hydrology, disease, etc. Remedy the problem and replace plants. Provide a one-time fertilizer application to establish the ground cover if a soil test indicates it is necessary. Weeds are present. Remove the weeds, preferably by hand. If pesticide is used, wipe it on the plants rather than spraying. 'The main treatment area Sediment has accumulated to Search for the source of the a depth greater than the sediment and remedy the problem if original design sediment possible. Remove the sediment and storage depth. dispose of it in a location where it will not cause impacts to streams or the BMP. Algal growth covers over Consult a professional to remove 50% of the area. and control the algal growth. Cattails, phragmites or other Remove the plants by wiping them invasive plants cover 50% of with pesticide (do not spray). the basin surface. Form SW40I-Wet Detention Basin O&M-Rev.4 Page 2 of 4 Permit dumber: (to he provided by UI{'Q) Drainage Area Number: BMP element: Potentialproblem: How I will retnediate theproblem: The embankment Shrubs have started to grow Remove shrubs immediately. on the embankment. Evidence of muskrat or Use traps to remove muskrats and beaver activity is present. consult a professional to remove beavers. A tree has started to grow on Consult a dam safety specialist to the embankment. remove the tree. An annual inspection by an Make all needed repairs. appropriate professional shows that the embankment needs repair. if applicable) The outlet device Clogging has occurred. Clean out the outlet device. Dispose of the sediment off -site. The outlet device is damaged Repair or replace the outlet device. The receiving water Erosion or other signs of Contact the local NC Division of damage have occurred at the Water Quality Regional Office, or outlet. the 401 Oversight Unit at 919-733- 1786. The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments. When the permanent pool depth reads 5.50 feet in the main pond, the sediment shall be removed. When the permanent pool depth reads 5.50 feet in the forebay, the sediment shall be removed. BASIN DIAGRAM ���lr! the h�QlT�S� l)t. J' 17 1'ermanent"l�l Elevati6n`7.50 Sediment Removal Bottom E 2.00 Pe anenN ------------------ Volume 0.00 -ft Min. Sediment Storage FOREBAI' Form SW401-Wet Detention Basin O&M-Rev.4 Pool � ;� �� •.: r 1- Sediment Removal Elevation 2.00 - ---------Volume Bottom Elevation 0.00 MAIN POND Page 3 of 4 OCT 2 8 2013 ` W BY: lift n. Sediment Storage f Permit Number: (to be provided by DWQ) acknowledge and agree by my, signature below that I am responsible for the performance of the maintenancc procedures listed above. I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Project name:Knox Landing; BMP drainage area num Print name:Atlantic Marine Corps Communities, LLC (AMCC)__ Title:Kathleen Murney for Thomas E. "tether, SVP Lend Lease Americas, Inc. Address:5401 Maryland Avenue Camp Lejeune, NC 28547 Ph Sit Da Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a resident of the subdivision has been named the president. I, N, a Notary Public for the State of /vo;,—M— ap") ct , County of �i7 5�du� , do hereby certify that personally appeared before me this day of , aD , and acknowledge the due execution oFthe Forgoing wet detention basin maintenance requirements. Witness my hand and official sea[, >W SEAL My commission expires Id "l/ Ij Form SW40I-Wet Detention Basin O&M-Rev.4 Page 4 oF4 AiA. �p4 WArF9 Cry p T NCDENR STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM LEVEL SPREADER - VEGETATED FILTER STRIP (LS-VFS) SUPPLEMENT This form most be completely filled out, printed, Initiated, and submitted. I11PROBECTjINF,ORMATION Project name 'Knox Landing Contact name Tom Davis, PE Phone number 615-365-4144 Date March 25, 2014 Drainage area number 2 - North Pond II1JD.ESIGN)INF,ORMATI0N The purpose of the LS-VFS 'Buffer Rule: Diffuse Flow Stormwater enters LS-VFS from A BMP Type of VFS Protected riparian buffer (scope < 5%) Explanation of any 'Other" responses above If Stormwater Enters the LS-VFS from the Drainage Area Drainage area ih Do not complete this section of the form. tmpervious surface area fh Do not complete this section of the form. Percent impervious % Do not oomplete this section of the form. Rational C coefficient Do not complete this section of the form. Peak flow from the 1 irdhr storm cfs Do not complete this section of the form. Time of concentration min Do not complete this section of the form. Rainfall intensity, 10-yr storm inlhr Do not complete this section of the form. Peak flow from the 10-yr storm cfs Do not complete this section of the form, Design storm Pick one: Maximum amount of flow directed to the LS-VFS cfs Do not complete this section of the form. Is a flow bypass system going to be used? (Y or N) Do not complete this section of the form. Explanation of any "Other" responses above If Stormwater Enters the LS-VFS from a f3MP Type of BMP Wet detention pond Peak discharge from the BMP during the design storm 33.6 cfs Peak discharge from the BMP during the 10-year storm 33.6 cfs Maximum capacity of a 100-foot long LS-VFS 2 cfs Peak flow directed to the LS-VFS 2 cfs Is a flow bypass system going to be used? Y (Y or N) Explanation of any "Other" responses above ECE9aiE APR 0 2 2014 BY: Form SW401 - LS-VFS - 29June2012 - Rev.10 page 1 of 3 LiVFS Design Forebay surface area Depth of Forebay at stormwater entry point Depth of Forebay at stormwater exit point Feet of level lip needed per cfs Computed minimum length of the level lip needed Length of level lip provided Width of VFS Elevation at downslope base of level lip Elevation at the end of the VFS that is farthest from the LS Slope (from level lip to the end of the VFS) Are any draws present in the VFS? Is there a collector swale at the end of the VFS? Bypass System Design (if applicable) Is a bypass system provided? Is there an engineered flow splitting device? Dimensions of the channel (see diagram below): M B W y (flow depth for 10-year storm) freeboard (during the 10-year storm) Peak velocity in the channel during the 10-yr storm Channel lining material Does the bypass discharge through a wetland? Does the channel enter the stream at an angle? Explanation of any "Other" responses above sq ft in in 50 fticfs 100 ft 100 ft 50 ft 7.75 fmsl 7.00 fmsl 1.50 % N (Y or N) N (Y or N) Y (YorN) Y (Y or N) 300 It 8.00 ft 21.20 ft 1.36 ft 1.00 it 1.84 fUsec Rip -rap N (Y or N) Y (Y or N) 13 � �13 Please provide plan details of flow splilter & supporting calcs. HWA E &-%.f = IV. APR 022014 BY: - Form SW401 - LS-VFS - 29June2012 - Rev.10 page 2 of 3 III. REQUIRED ITEMS CHECKLIST EDIT 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 the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a requirement has not been met, attach justification. Requried Item: Initials Page or plan sheet number and any notes: 1. Plans (1"- 50' or larger} of the entire site showing: T - Design at ultimate build -out, G (� — i Y a r o C ��, 0 �! OH -site drainage (if applicable), Delineated drainage basins (include Rational C coefficient per basin), r Forebay (if applicable), D f ' �� -tea J High flaw bypass system, Maintenance access, Proposed drainage easement and public right of way (ROW), and Boundaries of drainage easement. 2. Plan details (1" = 30' or larger) for the level spreader showing: �� -� G -Forebay (if applicable), High Flow bypass system, One foot topo lines between the level lip and top of stream bank, Proposed drainage easement, and Design at ultimate build -out. 3. Section view of the level spreader (1" = 20' or larger) showing: G t _ - Underdrain system (if applicable), Level lip, Upslope channel, and Downslope filter fabric. 4. Plan details of the Flow splitting device and supporting calculations (if applicable). 5. A construction sequence that shows how the level spreader will be protected from �� G 4 — ( I C� ✓%�,�r J/> sediment until the entire drainage area is stabilized. 6. If a non -engineered VFS is being used, then provide a photograph of the VFS showing that no draws are present. 7. The supporting calcutatlons. I �j +, T/}r, 8. A copy of the signed and notarized operation and maintenance (0&M) agreement. ECEtlPE APR 0 2 2014 BY: Form SW401 - LS•VFS - 29June2012 - Rev.10 page 3 of 3 Permit Number: '3A (71 01;o 5 (to be provided b DWQ) Drainage Area Number: Filter Strip, Restored Riparian Buffer and Level Spreader Operation and Maintenance Agreement I will keep a maintenance record on this BMP. This maintenance record will be kept in a log in.a known set location. Any deficient BMP elements noted in the inspection will be corrected, repaired or replaced immediately. These deficiencies can affect the integrity of structures, safety of the public, and the removal efficiency of the BMP. Important maintenance procedures: Immediately after the filter strip is established, any newly planted vegetation will be watered twice weekly if needed until the plants become established (commonly six weeks). Once a year, the filter strip will be reseeded to maintain a dense growth of vegetation Stable groundcover will be maintained in the drainage area to reduce the sediment load to the vegetation. — Two to three times a year, grass filter strips will be mowed and the clippings harvested to promote the growth of thick vegetation with optimum pollutant removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and may be allowed'to grow as tall as 12 inches depending on aesthetic requirements (NIPC,1993). Forested filter strips do not require this type of maintenance. — Once a year, the soil will be aerated if necessary. — Once a year, soil pH will be tested and lime will be added if necessary. After the filter strip is established, it will be inspected quarterly and within 24 hours after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County). Records of operation and maintenance will be kept in a known set Iocation and will be available upon request. Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately. BMP element: Potential roblem: How I will remediate theproblem: The entire filter strip Trash/debris is present. Remove the trash/debris. system The flow splitter device The flow splitter device is Unclog the conveyance and dispose (if applicable) clogged. of any sediment off -site. The flow splitter device is Make any necessary repairs or damaged. replace if damage is too large for repair. Q�ER 2 7 2013 BY:_ ---I Form SWU40I-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page l of 3 SMP element: The swale and the level lip The bypass channel The filter strip The receiving water Potential problem: The swale is clogged with sediment. The level lip is cracked, settled, undercut, eroded or otherwise damaged. There is erosion around the end of the level spreader tliat shows stormwater has bypassed it. Trees or shrubs have begun to grow on the swale or just downslope of the level lip. Areas of bare soil and/or erosive gullies have formed Turf reinforcement is damaged or ripap is rolling downhill. Grass is too short or too long (if applicable). Areas of -bare soil and/or erosive gullies have formed. Sediment is building up on the filter strip. Plants are desiccated Plants are dead, diseased or dying. Nuisance vegetation is choking out desirable species. Erosion or other signs of damage have occurred at the outlet. r How I will remediate the pro blen Remove the sediment and dispose of it off -site. Repair or replace lip. Regrade the soil to create a berm that is higher than the level Iip, and then plant a ground cover and water until it is established. Provide lime and a one-time fertilizer application. Remove them. Regrade the soil if necessary to remove the gully, and then . reestablish proper erosion control. Study the site to see if a larger bypass channel is needed (enlarge if necessary). After this, reestablish the erosion control material. Maintain grass at a height of approximately three to six inches. Regrade the soil if necessary to remove the gully, and then plant a ground cover and water until it is established. Provide lime and a one-time fertilizer application. Remove the sediment and restabilize the soil with vegetation if necessary. Provide lime and a one- time fertilizer application. Provide additional irrigation and fertilizer as needed. Determine the source of the problem: soils, hydrology, disease, etc. Remedy the problem and replace plants. Provide a one-time fertilizer application. Remove vegetation by hand if possible. If pesticide is used, do not allow it to get into the receiving water, Contact the NC Division of Water Quality local Regional Office, or the 401 Oversight Unit at 919-733-1786. Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 2 of 3 Permit Number: (!o be provided by DWQ) I acknowledge and agree by my signature below that I am responsible for the performance ofthe maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Project name: BMP drainage area number: 2 - North Pond Print name:Atlantic Marine Carps Communities, LLC (AMCC) TitleXathleen Murney for Thomas E Tether,EVP and Secretary Lend Lease(US)PPP,Inc. Address:5401 Maryland Avenue Camp Leieune. NC 28547 Phone:(910) 219-6388 Signature: Date: A) GJ C2_0 (-3 U Note: ' The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a resident of the subdivision has been named the president. I, n/f , a Notary Public for the State of , County of QH,S/o &_) , do hereby certify that � ea personally appeared before me this A day of Muleju her , .y / 3 , and acknowledge the due execution of the forgoing filter strip, riparian buffer, and/or level spreader maintenance requirements. Witness my hand and official seal, SEAL E IVE I My commission expires A9 NOv 272013 ttlr...._ Form SWU40I-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 3 of 3 Permit No. (to be provided by DWO) OF W A 7tic,4 LT O� pG r WDENR a Y STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM WET DETENTION BASIN SUPPLEMENT This form must be filled out, printed and submitted. The Required ftems Checklist {Pad 111) must be printed, filled out and submitted along with all of the required information. Project name Knox Landing Contact person Tom Davis, PE Phone number 615-385-4144 Date 10f2112013 Drainage area number 3 IADESIGNIiNF,ORMATION Site Characteristics Drainage area 650,127 ft2 Impervious area, post -development 243,284 ft2 % impervious 37,42 % Design rainfall depth 1.5 in Storage Volume: Non -SA Waters Minimum volume required Volume provided Storage Volume: SA Waters 1.5" runoff volume Pre -development 1-yr, 24-hr runoff Post -development 1-yr, 24-hr runoff Minimum volume required Volume provided Peak Flow Calculations Is the prelpost control of the 1 yr 24hr storm peak flow required? 1-yr, 24-hr rainfall depth Rational C, pre -development Rational C, post -development Rainfall intensity; 1-yr, 24-hrstorm Pre -development 1-yr, 24-hr peak Flow Post -development 1-yr, 24-hr peak flow Pre/Post 1-yr, 24-hr peak flow control Elevations Temporary pool elevation Permanent pool elevation SHWT elevation (approx. at the perm. pool elevation) Top of 10ft vegetated shelf elevation Bottom of 10ft vegetated shelf elevation Sediment cleanout, top elevation (bottom of pond) Sediment cleanout, bottom elevation Sediment storage provided Is there additional volume stored above the state -required temp. pool? Elevation of the top of the additional vaiume Form SW401-Wel Detention Basin-Rev.9-4118/12 31,433 ft3 34,696 tt3 OK, volume provided is equal to or in excess of volume required. R3 ft3 ft3 tt3 It N (Y or N) 3.6 in 0.40 (unitless) 0.65 (unitless) 0,15 inlhr OK 0.90 ft3lsec 1.45 0sec 0.55 fOlsec 3.80 fmsl 2.50 fmsl 2.00 fmsl 3.00 fmsl 2.00 fmsl -4.00 fmsl -6.00 fmsl 2.00 ft N (Y or N) fmsl 9 V E1�1 J OCT 2 8 2013 BY: Parts I. & II. Design Summary, Page 1 of 2 Permit (to be provided by DWO) IADESIGNil NFORMATION Surface Areas Area, temporary pool Area REQUIRED, permanent pool SAIDA ratio Area PROVIDED, permanent pool, A,,m.P.i Area, bottom of 1 Oft vegetated shelf. Aw a,6l Area, sediment cleanout, top elevation (bottom of pond), Abd ,,,, Volumes Volume, temporary pool Volume, permanent pool, VP,--,,d Volume, forebay (sum of forebays if more than one forebay) Forebay % of permanent pool volume SAIDA Table Data Design TSS removal Coastal SAIDA Table Used? Mountain/Piedmont SAIDA Table Used? SAIDA ratio Average depth (used in SAIDA table): Calculation option 1 used? (See Figure 10-2b) Volume, permanent pool, Vim, Pw, Area provided, permanent pool, Ate, ud Average depth calculated Average depth used in SAIDA, d., (Round to nearest 0.5ft) Calculation option 2 used? (See Figure 10-2b) Area provided, permanent pool, A, P, Area, bottom of 10ft vegetated shelf, A._,,,,, Area, sediment cleanout, top elevation (bottom of pond), A.,.,,, 29,024 ft? 19,114 ft 2.94 (unitless) 23,098 ft� OK 17,923 ft` 7,067 ft` 34,696 ft' OK 75,041 ft' 14,092 ft3 18,8% % OK 90 % Y (Y or N) N (Y or N) 2.94 (unitless) N (Y or N) 75,041 ft' 23,098 ft` ft Need 3 ft min. ft Y (Y or N) 23,098 ft` 17,923 fl� 7,067 ft2 "Depth" (distance btw bottom of 1 Oft shelf and top of sediment) 6.00 ft Average depth calculated 4.63 ft OK Average depth used in SAIDA, d. (Round to down to nearest 0.5ft) 4.5 ft OK Drawdown Calculations Drawdown through orifice? Diameter of orifice (if circular) Area of orifice (if -non -circular) Coefficient of discharge (Co) Driving head (H,) Drawdown through weir? Weir type Coefficient of discharge (Cw) Length of weir (L) Driving head (H) Pre-devetopment 1-yr, 24-hr peak flow Post -development 1-yr, 24-hr peak flow Storage volume discharge rate (through discharge orifice or weir) Storage volume drawdown time Additional Information Vegetated side slopes Vegetated shelf slope Vegetated shelf width Length of flowpath to width ratio Length to width ratio Trash rack for overflow & orifice? Freeboard provided Vegetated filter provided? Recorded drainage easement provided? Capures all runoff at ultimate build -out? Drain mechanism for maintenance or emergencies is: Form SW401-Wei Detention Basin -Rev,9-4118112 Y (Y or N) 3,00 in in2 0.60 (unitless) 0.43 ft N (Y or N) (unitless) (unitless) ft ft 0.90 ft�lsec 1.45 ft'Isec 0.16 Osec 2.34 days OK, draws down in 2-5 days. 4 A OK 10 :1 OK 10.0 ft OK 3 :1 OK 2.7 :1 OK Y { (Y or N) OK 1.0 ft OK N '(Y or N) OK N (Y or N) Insufficient. Recorded drainage easement required. Y (Y or N) OK Pump out for maintenance and overflow weir for emergencies !}{� OCT 2 8 2013 Parts 1. & II. Design Summary, Page 2 of 2 BY: r Permit No (to be provided by DINO) Ill. REQUIf2EDITEMSCHECKLIST` 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 the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a requirement has not been met, attach justification. Page/ Plan Initials Sheet No. :5� Al2-c 1. Plans (1" - 50' or larger) of the entire site showing: Design at ultimate build -out, Off -site drainage (if applicable), Delineated drainage basins (include Rational C coefficient per basin), Basin dimensions, Pretreatment system, High flow bypass system, Maintenance access, Proposed drainage easement and public right of way (ROW), Overflow device, and Boundaries of drainage easement. C-5.02- 4 2, Partial plan (1" = 30' or larger) and details for the wet detention basin showing: Outlet structure with trash rack or similar, Maintenance access, Permanent pool dimensions, Forebay and main pond with hardened emergency spillway, Basin cross-section, Vegetation specification for planting shelf, and Filter strip, og 3. Section view of the wet detention basin (1" = 20' or larger) showing: Side slopes, 3:1 or lower, Pretreatment and treatment areas, and Inlet and outlet structures. 4. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified on the plans prior to use as a wet detention basin. '� to Go►�i 5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for Forebay, to verify volume provided. _�_ ��'�•�� 6. A construction sequence that shows how the wet detention basin will be protected from sediment until the entire drainage area is stabilized. Q> IN CkL45 7. The supporting calculations. _ — -t AT' N20 8. A copy of the signed and notarized operation and maintenance (O&M) agreement. NIa 9. A copy of the deed restrictions (if required). Wn(,ftD 10. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. County soil maps are not an acceptable source of soils information. EC;E1 Y E k fw Farm SW401-Wet Detention Basin-Rev.9-4118112 OCT 2 S 2013 Part III. Required Items Checklist, Page 1 of 1 BY: 0 Permit Number: _ (to he provided by UII`) Drainage Area Number:_ Wet Detention Basin Operation and Maintenance Agreement I will keep a maintenance record on this BMP. This maintenance record will be kept in a log in a known set location. Any deficient BMP elements noted in the inspection will be corrected, repaired or replaced immediately. These deficiencies can affect the integrity of structures, safety of the public, and the removal efficiency of the BMP. The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the vegetated filter if one is provided. This system (check one): 0 does ® does not incorporate a vegetated filter at the outlet. This system (check one): ❑ does ® does not incorporate pretreatment other than a forebay. Important maintenance procedures: — Immediately after the wet detention basin is established, the plants on the vegetated shelf and perimeter of the basin should be watered twice weekly if needed, until the plants become established (commonly six weeks). — No portion of the wet detention pond should be fertilized after the first initial fertilization that is required to establish the plants on the vegetated shelf. — Stable groundcover should be maintained in the drainage area to reduce the sediment load to the wet detention basin. — If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain should be minimized to the maximum extent practical. — Once a year, a dam safety expert should inspect the embankment. After the wet detention pond is established, it should be inspected once a month and within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal County). Records of operation and maintenance should be kept in a known set location and must be available upon request. Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately. BMP element: Potentialproblem: How I will remediate the roblem: The entire BMP Trash/debris is present. Remove the trash debris. The perimeter of the wet Areas of bare soil and/or Regrade the soil if necessary to detention basin erosive gullies have formed. remove the gully, and then plant a ground cover and water until it is established. Provide lime and a one-time fertilizer application. Vegetation is too short or too Maintain vegetation at a height of long. approximately six inches. Form SW401-Wet Detention Basin O&M-Rev.4 E E F 'ktf L— `"`--) Page l of s OCT 2 8 2013 BY: 0 Permit Number: (to he provided by DWQ) Drainage Area Number: BMP element: Potentialproblem: How l will remediate theproblem: The inlet device: pipe or The pipe is clogged. Unclog the pipe. Dispose of the swale sediment off -site. The pipe is cracked or Replace the pipe. otherwise damaged. Erosion is occurring in the Regrade the swale if necessary to swale. smooth it over and provide erosion control devices such as reinforced turf matting or riprap to avoid future problems with erosion. The forebay Sediment has accumulated to Search for the source of the a depth greater than the sediment and remedy the problem if original design depth for possible. Remove the sediment and sediment storage. dispose of it in a location where it will not cause impacts to streams or the BMP. Erosion has occurred. Provide additional erosion protection such as reinforced turf matting or riprap if needed to prevent future erosion problems. Weeds are present. Remove the weeds, preferably by hand. If pesticide is used, wipe it on the plants rather than spraying. The vegetated shelf Best professional practices Prune according to best professional show that pruning is needed . practices to maintain optimal plant health. Plants are dead, diseased or Determine the source of the dying. problem: soils, hydrology, disease, etc. Remedy the problem and replace plants. Provide a one-time fertilizer application to establish the ground cover if a soil test indicates it is necessary. Weeds are present. Remove the weeds, preferably by hand. If pesticide is used, wipe it on the plants rather than spraying. The main treatment area Sediment has accumulated to Search for the source of the a depth greater than the sediment and remedy the problem if original design sediment possible. Remove the sediment and storage depth. dispose of it in a location where it will not cause impacts to streams or the BMP. Algal growth covers over Consult a professional to remove 50% of the area. and control the algal growth. Cattails, phragmites or other Remove the plants by wiping them invasive plants cover 50% of with pesticide (do not spray). the basin surface. Form SW401-Wet Detention Basin O&M-Rev.4 Page 2 of 4 a 0 Permit Number: (to be provided by DJVQ) Drainage Area Number: BMP element: Potentialproblem: How 1 will remediate theproblem: The embankment Shrubs have started to grow Remove shrubs immediately. on the embankment, Evidence of muskrat or Use traps to remove muskrats and beaver activity is present. consult a professional to remove beavers. A tree has started to grow on Consult a dam safety specialist to the embankment. remove the tree. An annual inspection by an Make all needed repairs. appropriate professional shows that the embankment needs repair. if applicable) The outlet device Clogging has occurred. Clean out the outlet device. Dispose of the sediment off -site. The outlet device is damaged Repair or replace the outlet device. The receiving water Erosion or other signs of Contact the local NC Division of damage have occurred at the Water Quality Regional Office, or outlet. the 401 Oversight Unit at 919-733- 1786. The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments. When the permanent pool depth reads 6.50 feet in the main pond, the sediment shall be removed. When the permanent pool depth reads 6.50 feet in the forebay, the sediment shall be removed. BASIN DIAGRAM (fill in the blanks) Sediment Removal El. -4.00 Pe ianen� \I- ------------ - -- Volume Bottom Elevatio6.00 -ft Min. Sediment Storage FORE BAY Form SW401-Wet Detention Basin O&M-Rev.4 Pool Permanent fool Llevation 2.50 Sediment Removal Elevation -4.00 Volume Bottom I'lcvation -6.00 i<IAIN POND NOV 14 2013 10 Pagc 3 of 1-ft n. Sediment Storage Permit Number: (to he provider! by UIVQ) Drainage Area Number: NB P element: Potential roblem: How I will remediate theproblem: Th .embankment Shrubs have started to grow on the embankment. Remove shrubs immediately. Evidence of muskrat or Use traps to remove muskrats and beaver activity is present. consult a professional to remove beavers. A tree has started to grow on Consult a dam safety specialist to the embankment. remove the tree. An annual inspection by an Make all needed repairs. appropriate professional shows that the embankment needs repair. -(if applicable) The outlet device Clogging has occurred. Clean out the outlet device. Dispose of the sediment off -site. e outlet device is damaged Repair or re lace the outlet device. The receiving water Er ion or other signs of Contact the local NC Division of dam e have occurred at the Water Quality Regional Office, or outlet. the 401 Oversight Unit at 919-733- 1786. The measuring device used to determin the sediment elevation shall be such that it will give an accurate depth readin and not readily penetrate into accumulated sediments. When the permanent pool depth reads 6.00 et in the main pond, the sediment shall be removed. When the permanent pool depth reads 6.00 fee\tin e forebay, the sediment shall be removed. , ` BASIN. DIAGRAM (fill in the blanks) s Sediment Removal %4.00 Pe anen--------------- Volume Bottom Eleva6.00 -ft Min. Sediment Storage FOREBAV Form SW401-Wet Detention Basin O&M-Rev.4 jkA; i•4r + Permanent Pool,Elevation2. 0 of Sediment Removal Elevation.-4,00- ti�� Volume -- -------------------------------------------- ti, Bottom Elevation -6.00 Sediment Storage MAIN POND Page 3 of 4 OCT 2 8 20134 :_. Permit Number: (to be provided by DWQ) I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed above. 1 agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Project name:Knox Landing_ BMP drainage area number.-3 Print name. -Atlantic Marine Corps Communities, LLC (AMCC) Title:Kathleen Murney for Thomas E. Tether SVP Lend Lease Americas Inc. Address:5-401 MaUland Avenue__ _ Camp Leieune, NC 28547 Phone Signat Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a resident of the subdivision has been named the president. I, Ld a Notary Public for the State of No,.* a County of 6p, 51,9 a , do hereby certify that personally appeared before me this day of , a013 , and acknowledge the due execution of the forgoing wet detention�biasin maintenance requirements. Witness my hand and official seal, � 2 �TAgy U� SEAL My commission expires Form SW40I-Wet Detention Basin O&M-Rev.4 Page of ok wArF9 ATA P NCDENR STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM LEVEL SPREADER - VEGETATED FILTER STRIP (LS-VFS) SUPPLEMENT This form must be completely filled ou4 printed, initialed, and submitted. igQROJEC1INF.ORMATION '- .,:, ' f' >� k� +�: � _. t • ,..t .... s' : s', ._. Project name Knox Landing Contact name Tom Davis, PE Phone number 615-385-4144 Date November 22, 2013 Drainage area number 3 - South Pond The purpose of the LS-VFS Buffer Rule: Diffuse Flow Stormwater enters LS-VFS from A BMP Type of VFS 'Protected riparian buffer (slope < 5%) Explanation of any "Other" responses above If Stormwater Enters the LS-VFS from the Drainage Area Drainage area Impervious surface area Percent impervious Rational C coefficient Peak Flow from the 1 inlhr storm Time of concentration Rainfall intensity, 10-yrstorm Peak flow from the 10-yr storm Design storm Maximum amount of Flow directed to the LS-VFS Is a flow bypass system going to be used? Explanation of any "Other" responses above If Stormwater Enters the LS-VFS from a BMP Type of BMP Peak discharge from the BMP during the design storm Peak discharge from the BMP during the 10-year storm Maximum capacity of a 100-foot long LS-VFS Peak flow directed to the LS-VFS Is a flow bypass system going to be used? Explanation of any "Other" responses above fe Do not complete this section of the form. fe Do not complete this section of the form. % Do not complete this section of the form. Do not complete this section of the form. cfs Do not complete this section of the form. min Do not complete this section of the form. inlhr Do not complete this section of the form. cfs Do not complete this section of the form. FicK one: cfs Do not complete this section of the form. (Y or N) Do not complete this section of the form. Wet detention pond 33.3 cfs 33.3 cfs 2 cfs 2 cfs Y (Y or N) ' E;') Y:— Form SW401 - LS-VFS - 29June2012 - Rev.10 page 1 of 3 LS-VFS Design Forebay surface area Depth of forebay at stormwater entry point Depth of forebay at stormwater exit point Feet of level lip needed per cfs Computed minimum length of the level lip needed Length of level lip provided Width of VFS Elevation at downslope base of level lip Elevation at the end of the VFS that is farthest from the LS Slope (from level lip to the end of the VFS) Are any draws present in the VFS? is there a collector swale at the end of the VFS? Bypass System Design (if applicable) Is a bypass system provided? Is there an engineered Flow splitting device? Dimensions of the channel (see diagram below): M B W y (flow depth for 10-year storm) freeboard (during the 10-year storm) Peak velocity in the channel during the 10-yr storm Channel lining material Does the bypass discharge through a wetland? Does the channel enter the stream at an angle? Explanation of any "Other" responses above sq It in in 50 fticfs 100 ft 100 ft 50 ft 2.85 fmsl 2.00 fmsl 1.70 % N (Y or N) OK N (Y or N) Y (YorN) Y (Y or N) Please provide plan details of flow splitter & supporting talcs 3.00 ft 16.00 ft 28.00 ft 1.01 h 1.00 If 1.72 fvsec Rip -rap N (Y or N) Y (Y or N) W ♦ 13 Form SW401 - LS-VFS - 29June2012 - Rev.10 page 2 of III. REQUIRED ITEMS CHECKLIST EDIT 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 the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a requirement has not been met, attach justification. Requried Item: 1. Plans (1' - 50' or larger) of the entire site showing: - Design at ultimate build -out, Off -site drainage (if applicable), Delineated drainage basins (include Rational C coefficient per basin), Forebay (if applicable), High flow bypass system, Maintenance access, Proposed drainage easement and public right of way (ROW), and Boundaries of drainage easement. 2. Plan details (1' = 30' or larger) for the level spreader showing: - Forebay (if applicable), High flow bypass system, One foot topo lines between the level lip and top of stream bank, Proposed drainage easement, and Design at ultimate build -out. 3. Section view of the level spreader (1' = 20' or larger) showing: - Underdrain system (if applicable), Level lip, Upslope channel, and Downslope filter fabric. 4. Plan details of the How splitting device and supporting calculations (if applicable). 5. A construction sequence that shows how the level spreader will be protected from sediment until the entire drainage area is stabilized. 6. If a non -engineered VF5 is being used, then provide a photograph of the VF5 showing that no draws are present. 7. The supporting calculations. B. A copy of the signed and notarized operation and maintenance (08M) agreement. In Page or plan sheet number and any notes: C &I — 4. 67 -b C. 67 --4. A#. CGr-4.o7 -t GCG -44* G-S.CA A G-S.b(. G - S.C>G C C'7 - I. o r A--s X4#r,n7 �ECIE ;or NOV 2 5 20113 x, r 8Y- `W Form SW401 - LS-VFS - 29June2012 - Rev.10 page 3 of 3 7 Permit Number: 5'4'(i tj o o (10 be provided b UWQ) Drainage Area Number:_ Filter Strip, Restored Riparian Buffer and Level Spreader Operation and Maintenance Agreement I will keep a maintenance record on this BMP. This maintenance record will be kept in a log in a known set location. Any deficient BMP elements noted in the inspection will be corrected, repaired or replaced immediately. These deficiencies can affect the integrity of structures, safety of the public, and the removal efficiency of the BMP. Important maintenance procedures: Immediately after the filter strip is established, any newly planted vegetation will be watered twice weekly if needed until the plants become established (commonly six weeks). — Once a year, the filter strip will be reseeded to maintain a dense growth of vegetation Stable groundcover will be maintained in the drainage area to reduce the sediment load to the vegetation. — Two to three times a year, grass filter strips will be mowed and the clippings harvested to promote the growth of thick vegetation with optimum pollutant removal efficiency. Turf grass should not be cut shorter than 3 to 5 inches and may be allowed to grow as tall as 12 inches depending on aesthetic requirements (NI PC,1993). Forested filter strips do not require this type of maintenance. — Once a year, the soil will be aerated if necessary. — Once a year, soil pH will be tested and lime will be added if necessary. After the filter strip is established, it will be inspected quarterly and within 24 hours after every storm event greater than 1.0 inch (or 1.5 inches if in a Coastal County). Records of operation and maintenance will be kept in a known set location and will be available upon request. Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately. BMP element: Potentialproblem: How I will remediate the problem - The entire filter strip Trash/debris is present. Remove the trash/debris. system The.flow splitter device The flow splitter device is Unclog the conveyance and dispose (if applicable) clogged. of any sediment off -site. The flow splitter device is Make any necessary repairs or damaged. replace if damage is too large for repair. r", i F f 3 E I IVE NOV 2 7 2013 BY: — Form SWU40I-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev-3 Page I of 3 BMP element: The swale and the level lip The bypass channel The filter strip The receiving water Potential roblem: The swale is clogged with sediment. The level lip is cracked, settled, undercut, eroded or otherwise damaged. There is erosion around the end of the level spreader that shows stormwater has bypassed it. Trees or shrubs have begun to grow on the swale or just downslope of the level lip. Areas of bare soil and/or erosive gullies have formed. Turf reinforcement is damaged or ripap is rolling downhill. Grass is too short or too long applicable). Areas of bare soil and/or erosive gullies have formed. Sediment is building up on the filter strip. Plants are desiccated. Plants are dead, diseased or dying. Nuisance vegetation is choking out desirable species. Erosion or other signs of damage have occurred at the outlet. How I will remediate the problem: Remove the sediment and dispose of it off -site. Repair or replace lip. Regrade the soil to create a berm that is higher than the level lip, and then plant a ground cover and water until it is established. Provide lime and a one-time fertilizer application. Remove them. Regrade the soil if necessary to remove the gully, and then reestablish eroper erosion control. Study the site to see if a larger bypass channel is needed (enlarge if necessary). After this, reestablish the erosion control material. Maintain grass at a height of aeproximately three to six inches. Regrade the soil if necessary to remove the gully, anditl en plant a ground cover and water until it is established. Provide lime and a one-time fertilizer application. Remove the sediment and restabilize the soil with vegetation if necessary. Provide lime and a one- time fertilizer application. Provide additional irrigation and fertilizer as needed. Determine the source of the problem: soils, hydrology, disease, etc. Remedy the problem and replace plants. Provide a one-time fertilizer application. Remove vegetation by hand if possible. If pesticide is used, do not allow it to get into the receiving water. Contact the NC Division of Water Quality local Regional Office, or the 401 Oversight Unit at 9-19-733-1786. Form SWU401-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 2 of 3 Permit Number: t` (to he provided by DWQ) I acknowledge and agree by my signature below that 1 am responsible for the performance of the maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Project name:Knox Landing BMP drainage area number: 3 - South Pond Print name:Atlantic Marine CoEps Communities LLC AMCC Title: Kathleen Murne lor'Fhomas E 1'ether EVP and Secretary Lend Lease US PPP Inc. Address:5401 Maryland Avenue Camp Lejeune, NC 28547 Phone:(910) 219-6388 Signature: Date:,_a- A)W o C1 Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a resident of the subdivision has been named the president. 1, A"/l ..m _ c�G �s _, a Notary Public for the State of we, , County of Z)a s/aliJ , do hereby certify that c lee f lakn �V personally appeared before me this day of MCt-)1z PM "✓ , ::7, U13 , and acknowledge the due execution of the forgoing Filter strip, riparian buffer, and/or level spreader maintenance requirements. Witness my hand and official seal, SEAL ` / �i% /�:✓"�� . My commission expires NOV 2 7013 E 6Y:__ Form SWU40I-Level Spreader, Filter Strip, Restored Riparian Buffer O&M-Rev.3 Page 3 of 3 Stormwater Permit Calculations "ECEIVED MAY 1 t zms BY: Knox Landing 136 Camp Lejeune, North Carolina May 2, 2016 ►' ARO NGI NEB By: Littlejohn Engineering 1935 2V Avenue South Nashville, TN 37212 (615)-385-4144 �. . �� � is � �•�� �� Knox Landing - Drainage Area 2 - North Pond - impervious Area 02-May-16 Total Drainage Area= 649,409 SQ-FT 14.91 AC Phase 1 On -Site Drainage Area = 497,052 SQ-FT 11.41 AC Buildings! Driveways: Building Tvoe: # Units Building Areal Unit I Total Building Area Driveway Area ! UniP To al riv r e 107a 3 3,192 9,577 1,302 3,907 107h 3.75 3,297 12,363 1,302 4,883 107c 4 3,330 13,319 1,307 5,227 109 3 3,606 10,819 2,090 6,271 111 1.5 2,694 4,041 825 1,237 112 3.25 2,910 9,457 972 3,159 t5wicing Area = *y,5/6 su-t- i Driveway Area = 24,684 SQ-FT ' Dnveway Area indudes House Sidewalks Roads: Road Areas = 47,718 SQ-FT Sidewalks: Length, 3,034 FT Width: 4 FT Sidewalk Area = 12,135 SQ-FT Trails: Length: 156 FT Width: 6 FT Trail Area = 934 SQ-FT Misc.: Bus stops & Mail Idosks: 0 5Q-FT Park Courtyard- 0 SQ-FT r Playgrounds 650 SQ-TT Misc. Impervious Area= 650 SQ-FT Camp Knox Road Existing Road Area = 5,992 SQ-FT Total Phase 1 Impervious Area = 151,689 SQ-FT 3.48 AC Off -Site Off -Site Drainage Area = 152,357 SQ-FT 3.50 AC Camp Knox Road New Road Area (By Others) = 11,645 SQ-FT Knox Landing Community Center Building Area = 1,102 SQ-FT Parking Area = 12,155 SQ-FT Sidewalk Area = 578 SQ-FT Trail Area = 3,080 SQ-FT Future Phases Total Build -Out Total Off -Site Impervious Area = 28,560 SQ-FT Total Future Impervious Area = 51,400 SQ-FT 1.18 AC Total Impervious Area = 231,649 SQ-FT 5.32 AC Percent Impervious Area= 35.7% Knox Landing - Drainage Area 2 -, North Pond - Wet Pond Calculations 02-May-16 - - - Drainage Area: Total Drainage Area = 14.91 AC Existing Impervious Area = 0.14 AC Proposed Impervious Area = 5.18 AC Total Impervious Area = 5.32 AC Percent Impervious = 35.7% Permanent Pool Depth = 4 FT Pond Surface Area: SA 1 DA Ratio = 3.154 Surface Area Required = 20,480 SQ-FT 0.47 AC Surface Area Provided = 21,111 SQ-FT 0.48 AC Volume to be Controlled: (Average Depth calculated from pond configuration) ( Taken from NC DENR BMP Manual SA I DA Ratios for Coastal Counties - Table 10-4, ) ( SA/DA Ratio 1 100 * Drainage Area ) ( From wet pond stage -storage tables ) Volume (V) = Design Rainfall * R_v * Drainage Area Volume associated with 1.5" of rainfall. R_v = 0.05 + 0.009 * I I = Percent Impervious = 35.7% R_v = 0.371 Design Rainfall = 1.5 IN Drainage Area = 14.91 AC Volume (1.5) = 0.69 AC -FT 30,119 CU-FT Drawdown Time Calculations: Temporary Pool Depth: 1.25 FT Average Head on Orifice: h = 0.42 FT Orifice Equation = Q = C_d * A * (2*g*h)^112 C d = 0.6 2-IN ORIFICE A = 0.022 SQ-FT Q = 0,07 CFS Via = 444,191 SECONDS = 5.14 DAYS 2.5-IN ORIFICE A = 0.034 SQ-FT Q = 0.11 CFS V10 = 284,282 SECONDS = 3.29 DAYS 3-IN ORIFICE A = 0.049 SQ-FT Q = 0,15 CFS VIQ = 197,418 SECONDS = 2.28 DAYS 3.5-IN ORIFICE A = 0,067 SQ-FT Q = 0.21 CFS VIQ = 145,042 SECONDS - 1,68 DAYS Therefore a 2,5-IN Orifice will provide acceptable drawdown time. Knox Landing - Drainage Area 2 - North Pond -Wet Pond Stage -Storage Tables 02-May-16 ELEVATION (F1') SURFACE AREA (SQ 1T) ]ELEV. VOLUME (CU Ff) SUS -VOLUME; (CU FI') VOLUME (AC 17) 2.00 7,650 0 0 0,00 3.00 8,713 9,176 8,176 0.00 4.00 9,835 9.268 17,444 0.40 5.00 11,013 10,418 27,861 0.64 5.40 11,501 4,502 32,364 0.74 6.00 13,411 7,466 39,830 0.91 7.00 16,983 15,112 54,942 1.26 7.50 21,111 9.478 64,419 1.48 8.00 24,451 11,380 75,800 1.74 8.75 26,531 19,113 94912 2.18 9.00 27,237 6,721 1 101,633 1 2.33 10.00 30,123 28,667 130,301 2,99 11.00 33.109 31,604 161905 3.72 12,00 36,196 34,641 196,546 4,51 Forebay Volume aS a Percentage of Total Pond Volume = 21.9% 'The following illustrates the stage -storage table broken down into fambay stage -storage and muin pond stage -storage. Average Ueuth Calculations: Option 2; Equation on page 10-13 from NC DF,NR BMP Manual. Area of PP = 21, I 1 1 SQ-FT PP Elevation y 7.50 Area of Bottom Shelf = 16,883 SQ-F[' Bottom Shelf Elevation = 7.00 Area of Bottom Pond = 7,650 SQ-FT Bottom Pond Elevation � 2.00 Depth = 5.00 1-7 Depth (av) = 4.08 FI' MAIN BASIN STAGE STORAGE TABLE Temporary Storage Volume Calculations: ELEVATION (IT(SQ SURFACE AREA S FT ELEV. VOLUME (CU FI') SUB -VOLUME ICU F[') 2.00 6,339 0 0 3.00 7.101 6,716 6,716 4.00 7,891 7492 14,209 5.00 8,710 8,297 22,506 5,40 9,045 3,551 26.057 6.00 10,343 5.812 31,869 7,00 12,649 11,477 43,345 7.50 1 15,331 6,984 50,329 FOREBAY STAGE -STORAGE TABLE ELEVATION (1711 SURFACE AREA (SQ I'I') ELEV. VOLUME CU FT SUB -VOLUME (CU FT 2.00 1,311 0 0 3.00 1.613 1,459 1,459 4.00 1,944 1,775 3,235 5.00 2.304 2,121 5,356 5.40 2,456 952 6,307 6.00 3,068 1,654 7,961 7,00 4,234 3,635 11,597 7,50 5,780 2,494 14,090 Required 1.5" Runoff Volume = 0.69 AC F1' 30,119 CI1 F-I- Temp. Pool Volume+Perm. Pool Volume= 94,539 CUFT Find Exact Corresponding BMP Surface Elevation: Next Lower Pond Contour - 8 Next Higher Pond Contour = 9 Lower Contour Volume = 75,800 Higher Contour Volume - 101,633 Corresponding IIMP Surface Elevation - 8.73 Top of Nall Elevation= 8.75 1'emporary Pool Volume Provided = 30,493 Temporary Pool Area Provided = 26,531 Ivy RIE Project Narrative: Knox Landinp_ (136 Homes) CEIVe October 21, 2103 MAY 1 f 2016 Revised May 2, 2016 BY: The Proposed Knox Landing neighborhood can be Found on the main side of Marine Corps Base Camp Lejeune off Highway 24 near Jacksonville, North Carolina in Oltslow County. The proposed project is the second phase of the existing Knox Landing neighborhood and calls for the construction of 75 new single family and duplex buildings (136 housing units in total). The site is located within the White Oak River basin and drains to Northeast Creek which has a classification as a SC;HQW NSW stream. The index number for Northeast Creek is 19-16-(3.5). The total area ofdisturbance for the site will be approximately 47 acres. This site development was permitted in April 17, 2014, See attached letter from NC DENIZ— High Density SWS 090925. The Knox Landing neighborhood will have all newly constructed streets with curb and gutter along all streets. The proposed project will rely on a discrete stornnvater collection ` system to convey stormwater runoff. Curb inlets and catch basins will direct stormwater runoFfthrough an underground piping system to a wet detention basin located on -site. Based on these conditions, the project will qualify as High Density Development and will be subject to water quality requirements as such. Water quality requirements are to be satisfied by constructing a new wet detention basin: The wet detention basin has been designed in accordance with State ol-North Carolina requirements and will provide drawdown of the 1.5-inch storm within 2-5 days. 'Calculations as well as drainage area exhibits and other requirements will be included in the stormwater permit application submittal. Sediment and Erosion Control measures for the site have been designed according to NCDENR details and specifications. All storm sewer inlets have been specified to receive either Hardware Cloth and Gravel or Sand Bag Barrier Inlet Protection throughout the project until Final site stabilization has been attained. In addition to the inlet protection noted, silt fence and rock check dams will be employed where necessary in order to prevent sediment from leaving the site and creating erosive soil conditions. Temporary sediment traps will be constructed during the construction period and removed once the contributing disturbed drainage areas have been stabilized. The project cal Is for the proposed construction of 957,600 sq-ft of built upon area and planned 127,129 sq-ft of future built upon area, divided into three drainage areas. A portion of the proposed built upon area will drain to the existing wet detention pond that was designed for the proposed area. The rest of the built upon area will drain to two proposed wet detention basins, located in the north and south portions of the site. A portion of the drainage area directed to the north pond is from the proposed Knox Landing Community Center. This proposed development has been slightly modified, "'► R t -' 'f 5 •1 �. 1 -- �i «� thus affecting the proposed drainage area and built upon area at this location. The proposed design of the north pond does not need to be revised as its proposed capacity is adequate. As part ofthe planned development a walking trail is planned to be constructed along Northeast Creek at the southern edge of the site. Parts of this trail do not drain to the wet detention pond. This section of the trail however, is to be constructed as an elevated, wooden, open -slotted boardwalk and will not count toward the over built upon area. -2- ROY COOPER Governor MICHAEL S. REGAN Secretary BRIAN WRENN Director September 18, 2020 NORTH CAROLINA Environmental Quality Atlantic Marine Corps Communities, LLC Commanding Officer Mr. Christopher Avery MCB Camp Lejeune Utility & Environmental Manager and c/o Neal Paul, Deputy Public Works Director 5401 Maryland Avenue Bldg 1005 Michael Road Camp Lejeune, NC 28547 Camp Lejeune, NC 28547 Subject: Permit Renewal State Stormwater Management Permit No. SW8 090925 Knox Landing High Density Wet Detention Pond Project Onslow County Dear Mr. Avery and Mr. Paul: The Wilmington Regional Office received a complete 8 year Stormwater Management Permit Renewal Application for the subject project on. The Division is hereby notifying you that permit SW8 090925 has been renewed on Se tember 18, 2020, and shall be effective until December 31, 2029. For your records, please find enclosed a renewed, updated, and re -issued permit and a copy of the renewal application. Please keep this permit on file at all times. Please note that the renewed, updated, and re -issued permit does not impose new or different terms; it merely restates some of the previous terms to provide you with a better understanding of your obligations under the permit. The renewal and reissuance of this stormwater permit does not imply that the site is currently in compliance with the terms and conditions of this state stormwater permit. The plans originally approved on October 16, 2009 and most recently revised on April 17, 2014, will remain in full force and effect in accordance with the regulations set forth in Title 15A NCAC 2H.1000. This permit is subject to the conditions and limitations as specified therein. Please pay special attention to the conditions listed in this permit regarding the Operation and Maintenance of the BMP(s), recordation of deed restrictions, procedures for changes of ownership, transferring the permit, and renewing the permit. Failure to establish- an adequate system for operation and maintenance of the stormwater management system, to record deed restrictions, to transfer the permit, or to renew the permit, will result in future compliance problems. If any parts, requirements, or limitations contained in this permit are unacceptable, you have the right to request an adjudicatory hearing by filing a written petition with the Office of Administrative Hearings (OAH). The written petition must conform to Chapter 150B of the North Carolina General Statutes, and must be filed with the OAH within thirty (30) days of receipt of this permit. You should contact the OAH with all questions regarding the Fling fee (if a filing fee is required) and/or the details of the filing process at 6714 Mail Service Center, Raleigh, NC 27699-6714, or via telephone at 919-431-3000, or visit their website at www.NCOA-H.com. Unless such demands are made this permit shall be final and binding. If you have any questions, need additional co ies of the permit or approved plans, please contact Daniel Sams in the Wilmington Regional Office, at 9I0) 796-7215 or dan.sams@ncdenr,gov. Sincerely, � Brian Wrenn, Director Division of Energy, Mineral and Land Resources Enclosures: Attachment C — Permitting History Renewal Application Documents DI S/dan: \11Stormwater\Perrnits & Projects120061060323 HD1.2020 09 permit 060323 cc: Wilmington Regional Office Stormwater File North Carolina Department of Environmental Quality j Division of Energy. Mineral and Land Resources Wilmington Regional Office 1127 Cardinal DMve Extension I Wilmington, North Carolina 28405 �wn+caaa_irin �1 � 910.796.7215 State Stormwater Management Systems Permit No. SW8 090925 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENTAL QUALITY DIVISION OF ENERGY, MINERAL AND LAND RESOURCES STATE STORMWATER MANAGEMENT PERMIT HIGH DENSITY DEVELOPMENT In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as amended, and other applicable Laws, Rules, and Regulations PERMISSION IS HEREBY GRANTED TO Atlantic Marine Corps Communities, LLC Knox Landing Camp Knox Road, Camp Lejeune, Onslow County FOR THE construction, operation and maintenance of three (3) wet detention ponds in compliance with the provisions of 15A NCAC 2H .1000 and Session Law 2008-211 (hereafter referred to as the "stormwater rules') the approved stormwater management plans and specifications and other supporting data as attached and on file with and approved by the Division of Energy, Mineral and Land Resources (hereafter referred to as the Division or DEMLR) and considered a part of this permit. This permit shall be effective from the date of issuance until December 31, 2029, and shall be subject to the following specified conditions and limitations: I. DESIGN STANDARDS 1. This permit is effective only with respect to the nature and volume of stormwater described in the application and other supporting data. 2. This stormwater system has been approved for the management of stormwater runoff as described in Section 1.78 of this permit. The runoff from all built -upon area within the permitted drainage areas of this project must be directed into the permitted stormwater control measures. The stormwater control measures labeled Drainage Area 1 (Existing Pond), 2 (North Pond), and 3 (South Pond) have been designed to handle the runoff from 609,796, 231,649, and 243,284 square feet of built -upon area, respectively. 3. The drainage areas will be limited to the amounts of built -upon area indicated in Sections 1.2 and 1.7 of this permit, and per approved plans. The built -upon area for the future development within Drainage Area 1 (Existing Pond), 2 (North Pond), and 3 (South Pond) is limited to 65,729, 51,400, and 10,000 square feet, respectively. 4. A 50' wide vegetative buffer must be provided and maintained adjacent surface waters, measured horizontally from and perpendicular to the normal pool of impounded structures, the top of bank of both sides of streams and rivers and the mean high water line of tidal waters. Page 1 of 5 State Stormwater Management Systems Permit No. SW8 090925 5. A vegetated filter strip is not required for these ponds as they have been designed for a 90% total suspended solids removal efficiency. However, the wet detention ponds associated with DA 2 (North Pond) and DA 3 (South Pond) provide level spreaders to diffuse the flow into and through the 50' vegetated buffer. 6. All runoff being directed into wetlands shall flow into and through those wetlands at a non -erosive velocity. 7. The following design criteria have been permitted for the wet detention pond and it must be provided and maintained at the design condition: DA Number 1 Existing Pond 2 North Pond 3 South Pond a. Drainage Area, acres: 35.58 14.91 1492 Onsite, ft2: 1,549,865 649,409 650,127 Offsite, ftz: N/A N/A N/A b. Total Impervious Surfaces, ftz: 609,796 231,649 243,284 Onsite, ftz: 544,067 231,649 233,284 Offsite, ftz: N/A N/A N/A C. Design Storm': 1.5 1.5 1.5 d. Average Pond Design Depth, ft: 5.00 4.00 4.50 e. TSS Removal Efficiency: 90% 90% 90% f. Permanent Pool Elevation, fmsl: 8.20 7.50 2.50 g. Permanent Pool Surface Area, ftz: ` 45,902 21,111 23,098 h. Temporary Storage Elevation, fmsl: 9.70 8.75 3.80 i. Controlling Orifice 0 Pipe, in: 4.0 2.5 3.0 }. Fountain Horsepower, hp: 3/4 1/4 1/3 k. Permitted Forebay Volume, ft3: 38,016 14,090 14,092 I. Permitted Storage Volume, ft3: 80,912 30,493 34,696 m. Pre -development 1 yr 24 hr peak flow, cfs: 2.13 0.70 0.90 n. Orifice Flowrate, cfs: 0.28 0.11 0.16 o. Receiving Stream/River Basin: Northeast Creek p. j Stream Index Number: 19-16-(3.5) q. Classification of Water Body: Sc, HQW, NSW II. SCHEDULE OF COMPLIANCE 1. No person or entity, including the permittee, shall alter any component of the approved stormwater system shown on the approved plans unless and until the Division has approved of the revised plan. 2. The stormwater management system shall be constructed in its entirety, vegetated and operational for its intended use prior to the construction of any built -upon surface. 3. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately. If the stormwater system is used as an Erosion Control device, it must be restored to design condition prior to operation as a stormwater treatment device, and prior to occupancy of the facility. 4. The permittee shall at all times provide the operation and maintenance necessary to assure that all components of the permitted stormwater system function at design condition. The approved Operation and Maintenance Agreement is incorporated by reference into this permit and must be followed in its entirety and maintenance must occur at the scheduled intervals. Page 2of5 State Stormwater Management Systems Permit No. SW8 090925 5. Records of maintenance activities must be kept and made available upon request to authorized personnel of the Division. The records will indicate the date, activity, name of person performing the work and what actions were taken. 6. A copy of the lease agreement that outlines the responsibilities of Atlantic Marine Corps Communities, LLC for this stormwater system, must be kept with the permit and maintenance activity records. 7. If the permanent pool volume is greater than 30,000 cubic feet, a decorative spray fountain will be allowed in the stormwater treatment system, subject to the following criteria: a. The minimum permanent pool volume is 30,000 cubic feet. b. The fountain must draw its water from less than 2' below the permanent pool surface. c. Separated units, where the nozzle, pump and intake are connected by tubing may be used only if they draw water from the surface in the deepest part of the pond. d. The fountain may not be placed into the forebay. e. The falling water from the fountain must be centered in the pond, away from the shoreline. f. The maximum horsepower for a fountain in the ponds associated with Drainage Areas 1, 2, and 3 is 314, 1/4, and 113 horsepower, respecitvely. B. The facilities shall be constructed in accordance with the conditions of this permit, the approved plans and specifications, and other supporting data. 9. Upon completion of construction, prior to issuance of a Certificate of Occupancy, and prior to operation of this permitted facility, the permittee shall cause a certification from an appropriate designer for the system installed to be submitted, certifying that the permitted facility has been installed in accordance with this permit, the approved plans and specifications, and other supporting documentation. Any deviations from the approved plans and specifications must be noted on the Certification. A modification may be required for those deviations. 10. All stormwater collection and treatment systems must be located in either public rights - of -way, dedicated common areas or recorded easements. The final plats for the project will be recorded showing all such rights -of -way, common areas and easements, in accordance with the approved plans. Access to the stormwater facilities for inspection and maintenance shall be maintained via appropriate recorded easements at all times. 11. The permittee shall submit to the Director and shall have received approval for revised plans, specifications, and calculations prior to construction, for any modification to the approved plans, including, but not limited to, those listed below: a. Any revision to any item shown on the approved plans, including the stormwater management measures, built -upon area, details, etc. b. Redesign or addition to the approved amount of built -upon area or to the drainage area. c. Further development, subdivision, acquisition, lease or sale of any, all or part of the project area. The project area is defined as all property owned by the permittee, for which Sedimentation and Erosion Control Plan approval or a CAMA Major permit was sought. d. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan. e. The construction of any future BUA listed on the application. Page 3 of 5 State Stormwater Management Systems Permit No. SW$ 090925 12. It is the responsibility of the permit holder, Atlantic Marine Corps Communities, LLC, to notify the Division of any changes in ownership and request an ownership/name change for the stormwater permit. However, please be reminded that if the lease agreement or contract between Atlantic Marine Corps Communities, LLC and the Department of the Navy is dissolved, cancelled or defaults, and the Division is not notified by Atlantic Marine Carps Communities, LLC to transfer the permit, then the responsibility for permit compliance reverts back to the property owner. As the property owner, the Department of the Navy and MCB Camp Lejeune must notify the Division immediately ofthepermit ownership change and submit a completed Name/Ownership form to the Division within 30 days. Otherwise the Department of the Navy and MCB Camp Lejeune will be operating a stormwater treatment facility without a valid permit. This is a violation of NC General Statue 143-215.1 and may result in appropriate enforcement action including the assessment of civil penalties of up to $25,000 per day, being taken against the property owner, MCB Camp Lejeune. 13. Prior to transfer of the permit, the stormwater facilities will be inspected by Division personnel. The project and the stormwater facility must be in substantial compliance with all permit conditions. Any items not in substantial compliance must be repaired, replaced or restored to design condition prior to the transfer. Records of maintenance activities performed to date will be required. 14. The Director may notify the permittee when the permitted site does not meet one or more of the minimum requirements of the permit. Within the time frame specified in the notice, the permittee shall submit a written time schedule to the Director for modifying the site to meet minimum requirements. The permittee shall provide copies of revised plans and certification in writing to the Director that the changes have been made. 15. Built upon area includes, but is not limited to, structures, asphalt, concrete, gravel, brick, stone, slate, coquina and parking areas, but does not include raised, open wood decking, or the water surface of swimming pools. III. GENERAL CONDITIONS Any individual or entity found to be in noncompliance with the provisions of a stormwater management permit or the Stormwater rules is subject to enforcement procedures as set forth in NCGS 143 Article 21. 2. The issuance of this permit does not preclude the Permittee from complying with any and all statutes, rules, regulations, or ordinances, which may be imposed by other government agencies (local, state, and federal) having jurisdiction. 3. This permit is not transferable to any person or entity except after notice to and approval by the Director. The permittee shall submit a completed and signed Name/Ownership Change Form, accompanied by the supporting documentation as listed on the form, to the Division of Energy, Mineral and Land Resources at least 60 days prior to any one or more of the following events: a. An ownership change including the sale or conveyance of the project area in whole or in part, except in the case of an individual lot sale that is made subject to the recorded deed restrictions; b. The sale or conveyance of the common areas to a Homeowner's or Property Owner's Association, subject to the requirements of Session Law 2011-256; c. Bankruptcy; d. Foreclosure, subject to the requirements of Session Law 2013-121; e. Dissolution of the partnership or corporate entity, subject to NCGS 57D-2-01(e) and NCGS 57D-6-07; f. A name change of the current permittee; g. A name change of the project; h. A mailing address change of the permittee; Page 4of5 State Stormwater Management Systems Permit No. SW8 090925 4. In the event that the facilities fail to perform satisfactorily the Permittee shall take immediate corrective action, including those as may be required by this Division, such as the construction of additional or replacement stormwater management systems. Additional or replacement stormwater management systems shall receive a permit from the Division prior to construction. 5. The permittee is responsible for compliance with all permit conditions until such time as the Division approves the transfer request. Neither the sale of the project, in whole or in part, nor the conveyance of common area to a third party constitutes an approved transfer of the stormwater permit. 6. The permittee grants DEMLR Staff permission to enter the property during normal business hours for the purpose of inspecting all components of the permitted stormwater management facility. 7. The permit issued shall continue in force and effect until modified, revoked, terminated or renewed. The permit may be modified, revoked and reissued or terminated for cause. The filing of a request for a permit modification, revocation and re -issuance or termination does not stay any permit condition. 8. Approved plans, calculations, supplement forms, operation and maintenance agreements and specifications for this project are incorporated by reference and are enforceable parts of the permit. A copy of the approved plans and specifications shall be maintained on file by the Permittee at all times. 9. Unless specified elsewhere, permanent seeding requirements for the stormwater control measure must follow the guidelines established in the North Carolina Erosion and Sediment Control Planning and Design Manual. 10. The issuance of this permit does not prohibit the Director from reopening and modifying the permit, revoking and reissuing the permit, or terminating the permit as allowed by the laws, rules and regulations contained in Session Law 2006-246, Title 15A NCAC 2H.1000, and NCGS 143-215.1 et.al. 11. A permit renewal request must be submitted at least 180 days prior to the expiration date of this permit. The renewal request must include the appropriate application, documentation and the processing fee as outlined in Title 15A NCAC 02H.1045(3). Permit renewed this the 18th day of September 2020. NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION /--, r l2 -"' brian vvrenn, uirecior Division of Energy, Mineral and Land Resources By Authority of the Environmental Management Commission Permit Number SW8 090925 Page 5 of 5 Lp r"(�} ,)p ,awCyjq ub 4l. 2I Date 5ece4ed I Fee Paid Permit Number NC DEQ Division of Energy, Mineral and Land Resources RECEIVED STATE STORMWATER: PERMIT RENEWAL APPLICATION FORM AUG 31 2020 NCCEQ In accordance with 15A NCAC 2H,1045(3), the current permit holder shall renew their high density permit li'8Nvy§ON RO prior to its expiration. Renewed permits are valid for a period of 8 years per Session Law 2011-398 (SB 781) Section 60.(c). This application form is for permit renewals only. A. PROJECT INFORMATION 1. State Stormwater Permit Number: SW8 090925 2. Project name: v _ K►-40X LAN�1>J 3, Project street address: XXX City: MCB Camp Leiuene County: Onslow ZIP : 4. What, if any, changes have been made to the project as permitted? NIA If the project has changed from the original approved plans, please complete SWU-101 for a Major Modification or Minor Modification Application form available at: htti)s://deg.nc.govlaboutldivisionslenergy- minera l- Ian d-resou rces/energy-mineral-land-rules/stormwater-program/post-Construction. B. PERMITTEE INFORMATION If changes to the permittee or project name have been made, please complete either the Permit Update form or the Permit Transfer form available at: hitps://deg.nc.gov/about/divisions/energy-mineral-land- resources/energy_-mineral-land-ruieslstorniwater-programlpost-construction. State Stormwater Permits do not automatically transfer with the sale of the property. 1. Current Permit Holder's Company Name/Organization: Atlantic Marine Corps Communities 2. Signing Official's Name: Christopher AverX 3. Signing Official's Title: Utility & Environmental Manager 4. - Mailing Address: 5401 Maryland Avenue City: MCB Camp.Lejuene State: NC ZIP: 28547 5. Street Address: City: State: ZIP: 6. Phone: (910) 333-3234 Email: christopher.avery(c�lendlease.com Stormwater Permit Renewal Form Page 1 of 3 May 11, 2018 .. C. SUBMITTAL REQUIREMENTS Submit the application package to the appropriate DEMLR Regional Office (Coastal, SA Waters) or DEMLR Central Office (Urbanizing Areas Ph 2, USMP, Non -Coastal HQW/ORM. Only applications packages that include all required items listed below will be accepted and reviewed. Initial each item below to indicate that the required information is provided in the application package: C� 1. A permit application processing fee of $505.00 payable to NCDEQ. 2. One originai signed hard copy and one electronic copy of this completed form. The signing official named on this application to represent the current permittee must meet one of the following: a. Corporation — a principle executive officer of at least the level of vice-president; b. Limited Liability Company (LLC) — a manager or company official as those terms are defined in G.S. 57D "North Carolina Limited Liability Company Act;" c. Public Entity — a principal executive officer, ranking official, or other duly authorized employee; d. Partnership nr limited partnership — the general partner; e. Sole proprietor; or f. Letter of authorization signed by one of the signatories noted in a — e above authorizing the signature of another entity. C� 3. One hard copy and one electronic copy of recorded documents required by the original permit that have not yet been received by DEMLR, including: deed restrictions, protective covenants, condom iniumlplanned community declaration and easements. If the project has been built, include documentation that the maximum BUA per lot or maximum total BUA has not been exceeded. If the project has not been built, include a signed agreement that the final recorded deed restrictions and protective covenants will be submitted at a later date. . L 4. O&M Agreements, Please select one: EJ-- I have a copy of the current recorded O&M Agreement for all SCMs, and I will continue to keep this on file with the permit; or ❑ I do not have a copy of the current recorded O&M Agreement for all SCMs and am requesting a copy be sent to me. I agree to keep this, on file with the permit. fl 5. Designer Certifications, Please select one: [� A copy of the certification(s) confirming that the project was built in accordance with the approved plans have been previously provided to the Division; or ❑ A copy of the certification(s) confirming that the project was built in accordance with the approved plans are enclosed; or ❑ The project has not yet been built. 6. [IF APPLICABLE] If the project has been built, one original hard copy and one electronic copy of a signed, sealed, and dated letter from a licensed professional stating that the SCMs have been inspected, and that they have been built and maintained in accordance with the permit. 7. [IF APPLICABLE] When the permittee is a corporation or a limited liability corporation (LLC): Provide one hard copy and one electronic copy of documentation from the NC Secretary of State, or other official documentation, which supports the titles and positions held by the persons listed in Section C.2 per 15A NCAC 2H. 1043(3)(b). https:llwww.sosnc.gov/online services/search/by titlel_Business Registration Stormwater Permit Renewal Application Form Page 2 of 3 May 11, 2018 D. PERMITTEE11'S CERTIFICATION �the person legally responsible for the permit, certify that I have a copy of the Permit and O&M Agreement on site (or I will obtain a copy and it will be kept on site), that I am responsible for the performance of the maintenance procedures, and the site has been and will be maintained according to the O&M Agreement and approved plans. I agree to notify DEMLR of any problems with the SCMs or built -upon area and to submit the proper forms to modify or transfer the permit prior to any changes to the project, SCMs, or ownership. All information provided on this permit renewal application is, to the best of my knowledge, c rrect and complete. Signature: / Date: 1 �y NOT a Notary Public for the State of County of __ do hereby certify execution of the forgoing instrpment. Witness my hand and official seal, 11 \P, 8 T HOB (Notary Sea!) 3��' �- i NpTAR V N= n Notary Signatb�:= c My commission expir�ej���W��`�`�\\ personally appeared before me 20_�)� , and acknowledge the due Irz ' AVG 3 12020 Bra Stormwater Permit Renewal Application Form Page 3 of 3 May 11, 2018 Attachment C - Permitting History Knox Landing Permit No. SW8 090925 Approval Date Permit Action B1.MS Version Description of the Changes 10/16/2009 Original Approval 1.0 Approval of three wet detention ponds 2/l/2022 Modification 1.1 Approval of changes on one pond 1 1/26/2013 Modification 1.2 Modification & expiration date extension to 12/31/21 4/7/2014 Modification 1.3 BUA modification 5/17/2016 Modification 1.4 increase in drainage area, decrease in BUA 9/18/2020 Renewal 2.0 New expiration date 12/31/2029 Page IofI Central Files: APS ____ SWP 9/1812020 Permit Number SW8090925 Permit Tracking Slip Program Category Status Project Type State SW Active Renewal with major mod Permit Type Version Permit Classification State Stormwater 2.00 Individual Primary Reviewer dan.sams Coastal SWRule Coastal Stormwater - 2008 Permitted Flow Facility Permit Contact Affiliation Facility Name Major/Minor Region Knox Landing Minor Wilmington Location Address County Int Of Camp Knox Rd And Boston Rd Onslow Facility Contact Affiliation Camp Lejeune NC 28542 Owner Owner Name Atlantic Marine Corps Communities LLC Owner Type Non -Government Owner Affiliation Thomas Tether 1801west End Ave Ste 1200 Dates/Events Nashville TN 37203 Scheduled Orig Issue App Received Draft Initiated Issuance Public Notice Issue Effective Expiration 10/16/2009 8/31/2020 9/18/2020 9/18/2020 12/31/2029 Regulated Activities_ Requested /Received Events State Stormwater - HD - Detention Pond 0utfaII Waterbody Name Streamindex Number Current Class Subbasin Burd, Tina J From: Burd, Tina J Sent: Friday, September 4, 2020 1:53 PM To: christopher.avery@lendlease.com Subject: SW8 090925 - Knox Landing The Wilmington Regional Office of the Division of Energy, Mineral and Land Resources (5tormwater Section) accepted the Stormwater Permit Renewal Application and $505.00 fee for the subject project on August 31, 2020. The project has been assigned to Dan Sams and you will be notified if additional information is needed. Best Regards, Tina Surd Administrative Associate II Wilmington Regional Office Division of Environmental Assistance & Customer Service Phone 910-796-7215 NCDEQ Wilmington Regional Office 127 Cardinal Drive Ext. Wilmington, NC 28405 h Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parties. Application Completeness Review Checklist (Non -Transfers) - Short Version Project Name: K_00t _ LA r YbI �) G Date Delivered to WIRO: Za'Z Project County/Location: am S }rpL�� IVLGB BIMS Received/Accepted Date: Z:�) Rule(s): El2017 Coastal [02008 Coastal P2k995 Coastal BIMS Acknowledged Date': ElPhase 11 1-1 Universal �1988 Coastal Permit Action: New Major Mod / Minor Mod / newal Permit Type: &? LID / LID Overall / HD &LD Combo General Permit / Offsite / Exempt / Rescission Development Type: Commercial Residentia ther Subdivided?: divisio r Single Lot Permittee Type & Documents Needed: 0Property Owner(s) 1-1 Purchaser El Lessee Viable? Viable? Viable? Deed Purchase Agmt1-1 Lease F�Nct Subdivided: Deed Subdivision: Common Area Deed Paperwork ❑New Permit #z: ®Existing Permit #: Expriation Date3: iZ 3 2-d2 L—JOffsite to SWB: Lot is in Master Permit? IDPE Cert on File? �HOA �Deveioper Viable? Viable? Election Minutes Application ee: 71$505 (within 6mo) Check#(s): 3- bZZ 1:1Supplement2 (1 new form or for alder forms FT&M2 Soils Report (Infil or PP) Calculations (signed/sealed) Deed Restrictions, if subdivided? Project Narrative FlUSGS Map (or on file?) Subject to SA?: Plans (2 Sets) FIFE Certification Electronic Copies Easements, Recorded (2017 Rules) NOTES: I original per SCM) Y / N Subject to ORW? 'Enter BIMS Acknowledged Date on this Sheet For New Projects -Enter New Permit # on Supplements & Deed Restiction Templates. 31f w/in 6 months and they are requesting a mod, STOP. Needs a renewal first. EMAILED ENGINEER DATE: REVIEWER NAME: Comments: GMQ\\\Reference Library\Procedures\Checklists\Completeness Review CheckFst_2020 01 31 EDNo Fee Y / N