The URL can be used to link to this page

Home My WebLink About20050732 Ver 12_Stormwater Info_20081031THE JOHN R. McADAMS COMPANY, INC. LETTER OF TRANSMITTAL To: Ms. Lia Myott Gilleski Date: October 31, 2008 NC Division of Water Quality 2321 Crabtree Blvd, Suite 250 Raleigh, North Carolina 27604 ** HAND DELIVER 919 733-9502 Re: Briar Chapel - Phase 4 SW Permit Mod Job No.: NEW-05042 am sendina you the followina item(s): COPIES DATE NO. DESCRIPTION 1 Application Fee - Check #76350 for $500.00 3 Letter Re: Stormwater M mt Plan Modification Request 3 Express Review Stormwater Management Plan A 3 BMP Su plement Forms and O&M Agreements 3 PH 4 Water Quality Fond Construction Dw s 3 PH 4 Water Quality Pond Final Design Calculations Booklets These are transmitted as checked below: ? As requested ® For approval ? For review and comment Remarks: ? For your use ? For your signature Copy to: M. Sanchez Signed: i. Jeremy VllFinch, Project Manager FOR INTERNAL USE ONLY ? Copy Letter of Transmittal Only to File ® Copy Entire Document to File CIVIL ENGINEERING • LAND PLANNING • SURVEYING PO Box 14005 • Research Triangle Park, NC 27709 . (919) 361-5000 • fax(919)361-2269 www.joh nrmcadams.com Since 1979 Research Triangle Park, NO Post Oltice Box 14005 Research Triangle Park, North Carolina 27709 2905 Meridian Parkway Durham, North Carolina 27713 800-733-5646 919-361-5000 919-361-2269 Fax Charlotte, NO 6701 Carmel Road Suite 205 Charlotte, North Carolina 28226 800-733-5646 704-527-0600 704-527-2003 Fax Wilmington, NO 3904 Oleander Drive Suite 200 Wilmington, North Carolina 28403 800 733-5646 910 799-8181 910-799-8171 f=ax THE JOHN R. McADAMS COMPANY, INC. October 27, 2008 Ms. Lia Myott Gilleski NC Division of Water Quality 2321 Crabtree Boulevard, Suite 250 Raleigh, North Carolina 27604 Re: Briar Chapel Community Phase 4 - Chatham County, NC NEW-05042 Stormwater Management Plan Modification Request: DWQ Project 4EXP 05-0732v7 Dear Ms. Myott Gilleski: On behalf of Newland Communities, we are requesting a modification to the existing Stormwater Management Plan Approval (see DWQ project number referenced above) for Phase 4 of the Briar Chapel Community that was approved as part of the 401 Water Quality Certification. For stormwater permitting purposes, this phase was referred to as Phase 1 in the previous approvals. However, in the approved construction drawings, it is actually Phase 4 of Briar Chapel. The project is located off US Highway 15-501, north of Andrews Store Road and south of Mann's Chapel Road in Chatham County, North Carolina. APPROVED DESIGN The proposed development is located within the Cape Fear River Basin, and drains to streams (Pokeberry Creek & Wilkinson Creek) classified as Water Supply IV (WS-IV), and Nutrient Sensitive Waters (NSW). As a result of the proposed development exceeding the maximum allowable limit for stream/wetlands impacts, an individual permit was issued by The United States Army Corps of Engineers (USAGE). Also, a Clean Water Act Section 401 Water Quality Certification from NCDWQ was issued with the individual permit. Under the 401 Water Quality Certification from NCDWQ, Newland Communities was required to submit final stormwater management plans that utilized constructed wetlands, bioretention areas, wet ponds followed by forested filter strips and similar best management practices designed to remove at least 85% TSS. To address the 401 Water Quality Certification stormwater requirements for Phase 4 of Briar Chapel, final stormwater management plans and calculations for 6 wet ponds with preformed scour hole/level spreader outlets that provided sheet flow of the I" runoff volume into the existing vegetated stream buffers (which serve as the vegetated filter strips) was originally submitted to and approved by NCDWQ in the Fall of 2006. Due to site layout changes and revisions to the total impervious area to each wet pond, a stormwater www.johnrmcadams.com Design Services Focused On Client Success Since 1979 THE JOHN R. McADAMS COMPANY, INC. Ms. Lia Myott Gilleski NC Division of Water Quality October 27, 2008 Page 2 management plan modification request containing revised plan sheets and calculations was submitted to and approved by NCDWQ under the project number referenced above in October 2007. PROPOSED MODIFICATIONS Once again due to site layout changes and revisions to the total impervious area to each wet pond, we are requesting a modification to the previously approved Stormwater Management Plan approval for Phase 4 of Briar Chapel. Listed below are the current proposed modifications to the 6 wet ponds located in Phase 4 of Briar Chapel: Wet Pond #1 -Impervious area to pond increased 2,240 SF Wet Pond #2 -Impervious area to pond increased 3,920 SF Wet Pond #3 -No changes from previous approval Wet Pond #4 -Drainage area to pond decreased 101,930 SF -Impervious area to pond decreased 27,126 SF -Pond grading revised to remove 30' emergency spillway weir Wet Pond #S -Impervious area to pond increased 3,399 SF Wet Pond #d -Impervious area to pond increased 1,748 SF As indicated above, this modification request proposes a minor structural change to wet pond #4. The previously approved construction drawings for the remaining S wet ponds in Phase 4 remain unchanged from the previously approved stormwater management plan. For your convenience, enclosed is a complete set of revised stormwater management plan construction drawings, revised stormwater management plan calculations, revised best management practice supplement forms, and revised operations and maintenance agreements for the 6 wet ponds in Phase 4. The construction drawing sheets oll t? :9'(. C?' ???IC;?ii?. ?? 1?.,_ ?;lt?' iiil.l?i? l,'?'?•'.t`:j U??"II,I ??. ;Ii(_? ?[i" i_'??_'li?l C;' :? Ir,l,?;:.'?? i)?1???', ;?.???(- !:??C?[??'.? '1l I! ?, l\:V_':.'U C? I'_`•.ii?!l :ifi:l kill s. 1'.. )1f)?.r. , Cif l;1 A.k i)W ?n!-;.11?1?1',.?;liCfrll?i.'•. i ..li ICC?'..`?' '1ii?_! i)?_'}'2li';!1..'lll OFFICE USI ONLY Date Received Fee Paid Permit Number(s) State of North Carolina Department of Environment and Natural Resources Division of Water Quality 401/Wetlands Unit EXPRESS REVIEW PROGRAM STORMWA"TER MANAGEMENT APPLICATION FORM This form may be pholocopied for use as an original I. GENERAL INFORMATION 1. Applicant's name (specify the name of the corporation, individual, etc, who owns the project NNP-Briar Chanel, LLC 2. Owner/Signing Official's name and title (peacoat legally responsible for facility and compliance): Mitch Barron, Vice President - Newland Communities 3. Owner Mailing Address for person listed in item 2 above: 16 Windv Knoll Circle City: Chapel Hill State: NC Lip: 27516 Phone Fax Number: (919)951-0710 Number: 919)951-071 1 Email Address: inbarron(€iewlandeonnnu€lities.coan 4. Project Name (subdivision, facility, or establishment name -should be consistent with project name on plans, Specifications, letters, operation and maintenance agreements, etc.): Briar Chanel - Phase 4 5. Location of Project (street address): The project site is located off from US HWY 15-501 (west side) south of intersection of US HWY 15-501 and Ma€n s Chapel Road and north of intersection of US T I W Y 15-501 and Andrews Store Road City: County: Chatham 6. Directions to project (fro€n nearest major intersection): Prom intersection of US HWY 15-501 and US HWY 64, go north on US 14WY 15-501. Approximately 5,000 feet north of the intersection of US H WY 15-501 and Andrews Store Road, the nroiect site will be on the left. 7. Latitude: 35°49'29" Longitude: 79°05'51 of project 8. Contact person who can answer questions about the project: Name: Jeremy V. Finch, PE Telephone Number (919)361-5000 Fax Number:(919)361-2269 E nail Address: jfinch@johnrmcadams.com II. PERMIT INFORMATION: I. Specify whether project is (check one): ? New ? Renewal ® Modification 9/2004 Version 1.0 Page I of4 2. If this application is being submitted as the result of a renewal or modification to an existing permit list the existing permit €iumber EXP 05-0732v7 And its issue date (if known) 10/31 /07 3. Specify the type of project (clieck one): ? Low Density ? High Density ? Redevelopment ? NPDES Stormwater ® Other **Overall Low Density w/ High Density Pockets 4. Additional Project Requirements (check applicable blanks): ? CAMA Maps ® Sedimentation/Erosion Control ® 404/401 Permits ? NPDES Stormwater ? Other 401#: 2005-0732 Information on required state permits can be obtained by contacting the Consumer Service Center at 1-877-623-6748. III. PROJECT INFORMATION 1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative (one to two pages) describing stormwater management for the project. See attached narrative 2. Stormwater runoff from this project drains to the Cape Fear River Basin. 3. 'T'otal Project Area: Approx. 140 acres 4, Project Built Upon Area: Approx. 43..__ % 5. How many drainage areas does the project have? 6 wet ponds 6. Complete the following information for each drainage area. If there are more than two drainage areas in the project, attach all additional sheet with the information for each area provided in the same format as below. Basin Information Drainage Area I Drainage Area 2 Receiving Stream Name See Attachment See Attachment Receiving Stream Class Drainage Area Existing Im ervious* Area Proposed Im ervious* Area % Im ervious* Area (total) Impervious* Surface Area Drainage Area I Drainage Area 2 On-site Lots See Attachment See Attachment On-site Streets/Alley On-site Parking On-site Sidewalks Other on-site -... ??.??._ Off site Total: Total: * Jinlmrvious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas, sidewalks, gravel areas, etc. 912004 Version 1.0 11age 2 of 4 7. How was the off-site impervious area listed above derived? NIA IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS The following italicized deed restrictions and protective covenants are required for all subdivisions, outparcels and future development prior to the sale of any lot. If lot sizes vary significantly, a table listing each lot number, size and the allowable built-upon area for each lot must be provided as an attachment, 1. The following covenants are intended to erasure ongoing compliance with state riparicm buffer authorization or General Certification numbers as issued by the Divisiotn of Water• Quality. These Covenants may not be changed or deleted without the consent of the State. (Draft Deed Restrictions attached) 2. No more than See Attachment A square feet of any lot shall be covered by structures or impervious materials Impervious materials inchrde, asphalt, gravel, concrete, thick, stone, slate or similar rrralerial but do trot include wood decking or the water surface ofsivinnnning pools. 3. Swales shall tnot be filled in, or altered except cis necessary to provide driveway crossings. 4. BUilt-111)0;7 area in excess of the permitted amount requires a modified water quality certification prior to construction. 5. All permitted runofffr•om outparcels or f tture development shall be directed into the permitted stornnvater control system. These C01717eC6017S 10 the stor7nnwaler Control System shall be perfOr fined in a manner that maintains the integrity and performance of the system as permitted. By your signature below, you certify that the recorded deed restrictions and protective covenants for this project shall include all the applicable items required above, 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 State, and that they will be recorded prior to the sale of any lot. V. SUPPLEMENT FORMS The applicable stormwater management supplement form(s) listed below must be submitted for each BMP specified for this project. The forms are located on the 401/wetlands unit website. Bioretention Worksheet Dry Retention Worksleet Level Spreader Worksheet Grassed Swale Worksheet Extended Detention Wetland/Pocket Wetland Worksheet Wet Detention Worksheet 912004 Version 1.0 Page 3 of 4 BRIAR CHAPEL, - PHASE 4 Final Stormwater Management Facility Design General Descri tion Located off of US Highway 15-501, north of Andrews Store Road and south of Mann's Chapel Road in Chatham County, NC is the proposed development known as Briar Chapel. Phase 4 of the proposed development is approximately 140-acres and will consist of the construction of single- family lots, a clubhouse/amenity center, along with the associated utility, parking, and roadway infrastructure. The overall proposed Briar Chapel development is located within the Cape Fear River Basin, and drains to a stream (Pokeberry Creek) classified as Water Supply IV (WS-IV), and Nutrient Sensitive Waters (NSW). As a result of the proposed development exceeding the maximum allowable limit for stream impacts, an individual permit issued by The United States Army Corps of Engineers (USACE) was required (Clean Water Act Section 404 permit). Also, a Clean Water Act Section 401 Water Quality Certification from NCDWQ was attached to the individual permit. Under the 401 Water Quality Certification issued by NCDWQ, the proposed site will be required to comply with the following; stormwater management requirements: 1. A final written stormwater management plan.for- each subwatershed (including signed and notarized Operation and Maintenance agreements) shall be submitted to the 401 Oversight and Express Permitting Unit. The stormwater management plan mqy be submitted to DWO in phases.for written approval as long as no impact to wetlands or streams occur in that phase until written approval is received from DWQ. 2. The stormwater- plans shall utilize constructed wetlands, bioretention areas, wet ponds ,followed by forested filter strips and similar best management practices designed to remove nutrients. The stormwater management plan must include plans, specifications, and worksheets for stormwater management facilities that are appropriate f6r° the surface water classification and designed to remove at least 85% 7SS according to the most recent version of the NCDIsNR Storinwater Best Management Practices Manual. 3. For low density areas of the project with low impervious surface area, engineered stormwater- management facilities are not expected. For these areas of lower impervious area, similar best management practices that remove nutrients such as grassed swages and vegetated riparian baiffers should be sufficient rather than more intensive engineered stormwater devices such cis constructed wetlands. In addition to the above DWQ stortxawater requirements, the following, stormwater duality and quantity items are required per Section 8.3 ("Stormwater Controls") of the Chathain County Compact Communities Ordinance: 1. Control and treat the first inch of runoff from the project site and from any gffsite drainage routed to an on-site control structure. Insure that the draw clown time for this treatment volume is a minimum of forty eight (48) hours and a maximum of one hundred and twenty (120) hours. 2. Maintain the discharge rate./or- the treatment volume at or below the pre-development discharge rate for the 1-year, 24-hour storm. To satisfy these stormwater requirements, Phase 4 of the Briar Chapel development will be treated via water quality ponds with preformed scour hole/level spreader outlets that will provide sheet flow of the 1" runoff volume into the existing; stream buffers. The existing stream buffers downstream of these facilities will be utilized as forested filter strips. 00 0 0 N N O r Z 0 0 Y W m w a w a Z i 11.1 Q Q N C) U LO ry C? Q 0Y 11.1 m z co CD Y 00 p, : w O C?, O m o cQ ( cc? a) F-r o 1' v n 117 Y W SS 7 `^ U O O 00 o 41 o, CL j O ~ N C p Y U) ? tin '' p LL > a) 4 U Z NT CD O o CU O. j O N m a- o f] al u) N r G d {ry Y d ? Q `G U Z ? c? `n ° O a as 0 O (\l m ; ?. 4 a U co o O M co O cq LO a. > Un O r 00 o cu 0' n M Q CS U z o CD N ] C ?p N R m N O O M Q 0 a) cu (D {W C Z U a Q Q p +; a1 cn p M 0 (U f6 ¢ O Q w m Q C? C E p CS C C ? ? j j a) CJ N Q E 0 Ca cY CJ N O O CD ??ooo6Cd W (D N (D LO CD 0 ? CD € H. a0] O 4 O co O ?0 0 ,n ?:'C1' CV C? C? O O h c LO cL r-- u-) c:) ?rI?r iMOm00?? o :t e} N r 0 CD* CD O 05$ rncm 1 c7oo0o I- m O rO O I` ? O I O C7 CO? LO OOOO O ?- 4> C:. ff tri O' C9 9 - O DD CL! IT CO O r O O M as Y CVC ?N (0 (7 ^QJ N N N ? N N (D Q) 0 O p sa 000 E N a ro b cu O C C-b c Z3 O 0 s? C U c? q ro 0 a) Co m 'Zi Q1 ro O .p L y O p g 0 0 0 0 0 0 0 0 0 O 0 O O a P a P P D 0 - - - - - - - - - - - - - - - - - - - - - - - - - - - - W p P p c 0 0 0 0 0 0 C Cl 0 0 O O Q P O D ? v v a a ? v v ?' m .r <r` v V', ? V, ? 11 a v l a Q a V a C, a M, a O <r O I'D a d ? 0 a zm a # ? ro o 0 o p p a n a a a o o o o o y a c o o p p o o a a p o 0 0 ? 0 o 0 co e a a o o r, rn h, rn r ro 1` r^ r, rn r, m, r, M, r, m, rn s; rn n y' n an o oo W 5 3 a N : m ? ro in .Oy O a a - - a M [+ G a a P a p a p g g o P g o v1 o o o C P o O p a o a P o P a a o p o P n p o P p g o O P P o o v, rv, n{ n n a v rn ? n In +. lo, v? v? ? ? ? a n v n a n a rn a m ' u O, v v a rr a cr a a ?r v v v v a ? a a a ? o 'S p g P D o O O O O O o O o O O O O O O q O O o 0 0 F, d p p g , O ? O rn D D D o O D O O O h D n O n o n O O O o O o o o, p o p o P ff, O n, O h o 0, O o o 0 O 0 a a d' et , V `tl tl' `tl' r^ rn Q Q V R V Y V N m, CJ V V t} r d ik '0 O D O O O O O O O O O O O p d a C O C O O O o O d O P O a O p P a p P P o O O O O O O Cl O C O O O O O O O O p p 0 p p O O rn O r^ O rn C rn C rr; O nt r O rn O I O m, O fr, O rn O h O n O O P ? w, r r n ' o m M r, r, f ? a v , ?r <r ? . ? ? n v v , v v v v v a N V V d' rn NI rr M fh fr , N V K d' V d' <Y 7 d' M rn a 5 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - ? ? o o c c c o o o o o 0 0 0 0 o o o o o a a o p a o o o o o o o o C O O O O O O O p p o P a g o o o o o o o o 0 o o o o o o o o o o o c c c c o o c o p O P O a P a a o a o a D o D o O o O o O o O c O o O o O o O O P P O O O O C O O O O O O O O O P O a P o g P a O P D O O O O O O a O o O o O o O o O o C o O o O o O o p p o p o o a o a a P n O o C P P O O O O O O O O O O O O O C O a y o o o c c o o l o o o o o o o ?n o o o o n o r v C P ry o D r ? O rn n v on Zt' v, v o M o o o o o o o o o r o m o rn o vo o I O w p a p w o o n o ^ a a n o ro m r? r r r, r ln ln ?n n on rn In ; q ^ ; r ; r r r h , n o n < ? o n o o o o ; r r P o o c c o ? ? ? ? i? n h -, -, ? , r a g o o ?, M ` n ' , m In m % n n .a a v r • r z I vn v v ? ? ? ' vC "t V v N v rn V n v n v t ? C l , ' , a r r r ., • Y ' ' ; 7 v v q ' d' v v l v , v t a a da of y v v <r . tl' <r cF v n V K v v 7 v ? v rn rn m rn rr; rn "n rn 1, r', wy v m v < Y V? v V' , V v rn , m • m m , C d' a' o w etr <r C a C v rn M, rn rn; v a v c 'a r .y w v V d' C r• e gO y < rw < V Y v v a V d 4 < ? d e ? < cY K C d V d ? {, a a ? - EP a c, w p o 0 0 0 0 0 0 _ p o o o a J o J o -? G 0 0 o o O 0 ,S 0 a 0 .a 0 a 0 0 0 O o a o o o "o c 0 0 0 0 0 0 0 0 0 o ^? a o 15 o G o 0 o O o P o a a 0 0 0 0 O O O c o J p `o Q 0 0 o o o o o a o a o o o a 3 o ? o ? o j o o 0 Q 0 0 Q 0 0 0 o o o o o c "o p • .] .l .J .a '7 ,? a a S J J .F a Q -1 E E .? E E E E J J ?, 4 rJ J r-1 a „ , , , .-1 .-1 `0 ?w C F ?' o O a O h O b O b O b O o Q 0 O o P b a o a 0 p o p b P o 0 0 . W W . W 0 0 N - W M o N 0 0 N o 0, O O O O W ? ? a P o o 0 o 0 O 0 O 0 O W a W M Da0 M W W W 90h 0 ? ? P P P W 000 W W o : a 0 a p ? p O O ? O O OOi 0Ci 4? W 0 ? - Ow 0 0 0 0 `a.' `OD '0 "D o O O o O O a p to P b P b g o O ? V' ? ? ? - PV ? O O O h W W W W 00 00 W W V ? , aP U U U _ s p V U U U V U U U - - - - - - - - - - - - - w n ^ ?n v ^ N .... o a co IC, - o o, w n ? ?n a m N ? O P W '/1 Y' r*? N W r v? N - O G\ CO h r O P p v P a 0 - 0 o 0 01 D\ e -^ M rv - o c O n V ,n 7 M 0? C P a _ N rn - v - ,r, - '/r V' n C+ O - `n d' rn N ? o P OO n V' ?n + 0 0? W r ^ V ^ 0 00 O C+ C o O ., O N C In O a O ?n O +o O h O -0 O a N m N N - ry h m L, ^- o N - N Nrl I, N v N v, N c N Q, C - - p L1 01 O P O 00 d, D'v W W M W W n n n n n h h h n h ?D V' - - ? U C a ? ? ? P N N N N N N N N N -^ N N N N N N ? L1 ? ? ? „„ rn N m fn M .- - M, M, N N N N N ?f (n rn r . r . N , M, M M m; m, fn a q! O a B6 q - N rn V C n 00 Or O '- N to - Y ?n - r - 05 - U O N - N rl N <n. N V N N 'V N t- N W N Q. N O rn - rn N fn M ?n y' my kn r? rU r W rn O C - N <{ r V y v V) V V' V t- V W U a O Y+ ?n N ?n It ?n vl vl '/1 t- dJ P '? a - iV 1 <F ?' ?n '? O V n ?' 00 V' 0? Vn O 1. .w n N n fn h tl' h h h V' C- h r W r C r q W - 1 rte, V o0 VI 00 00 h O0 W W O, 00 O U - O? N G? fn G? T O? ?n S V' T r 4? M C 0+ D D .. O N O In O O ?h O V O h O W O d O - (`I m. d' ti ti r 00 O` O N -^' rvl d .? y a 0 U - 1 ? i , I - I - J - L - - - - - - - - - - - - - - - - - - -- - - 4 0 0 0 0 0 0 0 0 0 - - - - - - -- - - - - - - - -- 4 P pj Q o O o O o O o O o O 4 C c o c a n o 0 o c rn o +n 0 'n, o 'n o h o N 4. O O ` r•1 ry rq fM1 f+r fn. ? In r^; ^ t: hi M Q` Q` Q Q Q Q a ? Q ?r Q Q Q Q ?t v er w a b q 0 0. G N d ? y fl D W fl a p p W V ? 0 0 0 0 0 0 0 0 0 0 0 0 6 0 ' 7 0 0 O 0 O 0 O 0 O 6 p 0 O O O O O O D D O O O O O O O O g O p g n a P P 4 C p 0 0 0 0 0 0 0 0 0 b 0 0 0 0 0 0 0 0 0 0 6 0 0 0o 0 1 [ t h h, W a, d Y' I'!, Q Q Q Q V ?'Y tt V V? V V 1? h In n V d; 0 d; d Q V ?' a M r rn rr. In rn rn rn rM1 r to fr, tr, K, tr, fr, N. f1 In In In rn r In a 3 - - ? ? o a -- -- -- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - a ? ? 'O o 0 0 0 0 o o c o o o o o p a a n 4 4 o o o 0 0 0 0 0 0 0 o o o o o a o 0 0 0 o o o o o a p p n o 0 0 0 0 0 0 0 y o Q W o h ` O 0 O 0 o 0 O d; O e1', O M D In O f O n O n O n O '1 p I a n O (; 4 h 0 h 0 r 0 r 0 h 0 h 0 h 0 h D t? 0 h 0 fr 0 fry 0 r^ 0 h 0 h 0 h 0 t? 0 1` n W 0 h 0 h 6 h 0 L 0 h 0 h 0 h 0 Y' 0 `U p Q P Q p V Q rn `T rn n r I r rn Q Q N m V Q Q Q Q Q Q fM1 rr 11 Ir, In f^. 11, <n r n 'C Q R r M M rt - ^ M 'n - f n m In e.r a `0 0 0 0 0 c o o n a a n p P a o o c o 0 0 0 o n a a p h n h h h h r r; w, r, h , In 11, 3 - -- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - ? a A. ? O O O O O O O O C O O O O O O p g p O O 4 0 0 D 0 0 0 0 0 0 0 0 0 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 p p a 4 P 0 p 0 O 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 q 0 q a P p P 4 O 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 C 0 O 0 0 0 0 0 0 0 a O a a p p 4 4 b 0 D D O O 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Cl 0 q p O O P 4 b 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 c 0 ' O 0 ' 0 D ' 0 0 a 6 y y 0 ? 0 0 f? 0 1? 0 h 0 h 0 1? O h O h O h O l O l O I O t` O l O f? O a p a a a p Q 4 Q D 4 O M 0 0 rr r^ rt N; h h h h h h h h f? (? h h 1• h h N N N h '/1 h [? r h I? l? h h r h i? V V 0 O d' d t' C V <Y <Y 'tt . C K Q ?'F 'S <Y 'T V V C V O, O O 4r 4r rM1 ^, i ' 1 rr rM1 f? L? t? f? h Q Q, t, ? d d' C V tl <S d Q Q QI 7 0 1 ? h ? ? e n q ri o v v rf m tn` f+ i ?` et er , rr , ey v <F rr rn rn r m m t? rr', a r a r <o Q Q Q Q h ' Q r rn c n rn m m en m r? , rn ro e , 11 In In rrt r rn rr [r, rM rr, M ! . fn r^, In r rn t Q Q of Q Q V C a a d' fn f^ rn [ rn r In. rn r M. r m o r r r r r r •r, m u 7 ° o a "o o o 'o " o " " ` a c o o o o o o "o o o o o 0 0 0 0 0 3 o o o o 0 0 o o o o a a a o o c o ? a ? ? o o o c o ? a a o "o o o o o 0 0 ? 0 ? "o o ? ? o ? a o ? o o "o o o o a o "o o "o ? 'o o ? ? o a o o a o a o a a a a a o o a o o a o a o a ? `0 a ? 0 a ? o a o a c a o a o a o a a a a a a ? a ,? ? a a .a a a a .: a ,a ., a a .: a a a a ? a ? a .a .a .a a a .: ,? a a a a a a a a a a a , a . , .a .a .a .a .a a a a a a a a a a a , a . a a , .a , .a a a a a a a a a " a a a a , a .a . . . .. ? .? , . . . . b o o b o b b o o o o yr a o a o e o m o o o v? b h p o a b o ,n o a b ca b m b ro o w o w a w b o b ?, b o o o o o o b o b b o v^ o o b m o oo o rn a o o o o o o o, o o, b rn o a o rn o rn o o v? o o o b b o :? b o o 0 o 0 b 0 o .41 o o o ,n o rn o 'n b 'n b 'n o ?n b 'n b 'n c h o h o vs o o b o b o n o 'n o m o 'n o v, o v, o ?n o h b h o n o ro o w o w o o0 o oa o m b m o on o 0 o 0 o 0 o 0 0 0 0 'n 0 0 'n 0 +n 0 ,n 0 'n 0 'n 0 'n 0 'n 0 0 0 0 u 0 h W . o, O P O '- hl fr, a N t^, V' '/+ 4n ^- N rM1 r O ti N N, Q N 0 1. D7 T O W N V' 'n '- p GM1 ,n Q ^ N ?^ O + ' V1 0 - h - W - Q, O 'C n - a O Q O Y Q Q rr; Q N Q ^^ Q O Q D, rn W M h to h 'n V' h +n +n '4 fn rn h NI '- p C Q Q t` Q O 1 O V O 'n tb N h ?n 'V N 'n 'n .. N N N rn N st N +n N N h N W N U N 4 - r " r r , n rr+ M, I In n P M1 O 7 -• C N O 11, d' V h N fn In In n h r a N rn N rM1 N rn rr, rr O -' rn tr, to to fn In rn rn rr r? rn r, e} <} fn er M Q M, Q rrl Q rM1 Q M a M Q M d' M h rr, .- - .- rn N N - N - N N N N N N N ^ ? N ' ' N ' N ' N N N N n - - Q Q - - -• N N N N N N N N N rI N rl -- •^ +^ N N N N N N N N N (V N nl N N N N N N C+1 N N N N N N Qr i 0 F? p 3 W rl rn, ct Vr u' 1? W U O .-. N M V 'n V W C p r- N fr, Q 'n b 1? W 0+ O -^ N iM1 a ' h W a _ N r, Q h >7 P O .• N m V n V h W T O - N ^ Q D N M 1 O .• N M n b h 0 T O - N ^ Q D W O \ O O -• ^ N '-• , -+ a ^ n o '-• h ^ a ^ a o N - N l N r. N Q N < N ?^. N h N 00 1 D\ rl O ^ -^ ^ N r. NI NI Q r't ?n r 'V r h r M n fT r, O ' - a N Y N N N N N N N N rn <M1 f In 111 In <n f Q Q Q Q Q Q Q Q Q Q n V1 V1 'n ?n ?n h h h V U' b `.? ? V V' 'V h 1? h h h h 1. h h h W W of W - - T Ct P P C` (T rT rT (T rT - O N O N a N a N a N a N O N O N N N - N - N N N N - N N N N N N N N N nl rl N N N N N N N N N N N N N N N N N p _ - - - O p D V ? ° ° ° ° o o a p o a o P a o o o 0 o 0 0 °. r ? ri N ri Ni N rl '° o o O d 6 a p g q O P o O o 0 0 0 0 0 0 d P p g p o D O 0 0 0 0 0 0 0 0 0 0 0 0 0 q q P d O o K 0 tl' 0 V' 0 V; o Q d Q a 'P g P h O h P i+ 0 t ' O et o eh 0 ?f 0 'f 0 "4? 0 v, o a Q d Q, a r p <l' p Q, O K, o <t; D 't o V, 0 Q, 0 v, 0 Q 0 v, 0 a, 0 d 0 d 0 N 0 1' 0 'rY 0 ?'f 0 V 6 Q p Q 0 Q, 0 K, a G r, r? , rr , rr, rr, ,- , , rl N N N N N N N N !I N N N N N N N N N r` N N ll - rl /l rl N N N N N s V ? m d ? 8 'C D 0 0 0 0 0 0 0 0 0 0 O y ° D 0 0 0 0 0 0 0 0 0 0 /1 ? 0 01 h, h, 1+ I+ h '- Q, N ? N a N a N K N d' n1 t^I Q G l4 ? 3 # A ro p n o a o o P o o D o O o O o 0 0 0 o O d a a P O P cl P P D o 0 0 0 0 o O O O o 0 o c o 0 0 o a a a O P o P P ° a o P p P a o o o P O O O O o 0 0 o o o o o a a o c P h O h O l+ O O h O Q O O V O e O O O e O o O o O o O o C o O o O o O o O o a a a P a o o o o o , q M1 M , , ? r 1 7 , , a r a , l N N N PI , 0 M M fr B: M !h M fn fn K. <n fp M 10 Iq M M In In 11 M m rr M f , <r <n m M I , 1 n rn M r , m n Q Q Q N Q , , d 3 w ? m G ? C o I m o ? 0 O o 0 d 0 d 0 p 6 p g p p p p P c P D o 0 O 0 O 0 O Cl O 0 O O a V Y tl; M1 G P O G4 r? r. ,r. rn , M rr; M C.' a a , v Q a p 0 A< a - 3 - - - - - - - - - - - - - - - - - - - - - - -- - - - - - - - - - - - - - -- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - g p p p o 0 0 0 0 0 0 0 0 0 0 0 0 D o 0 0 0 0 0 0 0 0 0 0 0 0 0 6 p O p O P O P P O 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 o d a q p O C O o O P D O 0 0 0 0 0 0 0 0 0 0 0 0 0 o d q a p O 0 o O 0 0 0 0 0 0 0 0 0 0 o c O 0 0 a q q c O p c D 0 0 0 G 0 P 0 P Q y g p p q O P 0 0 0 0 0 O 0 0 0 0 0 D 0 0 0 0 0 0 0 0 0 0 6 0 0 0 0 a a p O q O 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 a a p O P O 0 0 D D 0 0 0 0 0 0 0 0 0 0 0 0 0 ' 0 0 0 ' 6 p P P P P P D ' O p G G a G a P K G d G d' O K O O tY' 0 C' 0 <Y d V p Q a Q p K P K p K P K D V D V o V C 0 V P. ° K a a a v h n h K K K K Q Q K Q, . I h 1+ h 0 0 0 V, d', "S 'tl' Y cY V Q Q, ? Q ? I+ I+ I+, h h K 'C Q K a ? a, 0 0 0 O 0 0 0, O ? O q h t+ l+ V ^ V V, Y V, V -T a a 7 d d? V <Y Y Y tl V O rn K, K, K, V cF d . V, V C . . a , , , , . O rn rn fn M fn fr, 4n Ir, fr, f, M M M I^ rr, K K K r rn N; M M; <r, rn M rn NI fn M M fr fr, to f^ M r, Ir M f rn K K K Q Q Q Q Q Q Q a N. M fr, In M 4? f In f^ rn M N N N N N N Q K N N rl N N N N N N N N N rl N r] N N N N N N N N N N N N N N N N rl 0 tl 0 ' o 0 a 0 a 0 a 0 0 a 0 a 0 ? 0 0 3 0 3 0 ? 0 0 .x 0 3 0 3 30 3 0 3 0 - - - S 0 0 a 0 0 a 0 ? 0 0 ? 0 ? C si V 0 0 0 0 0 o 0 o 0 0 a o o o o 0 0 0 0 0 0 o a 0 0 0 0 0 0 0 0 0 0 o 5 o - 0 0 a o o 0 o " % n k e Y. Y Y, 0 k Q k v x 0 x 0 k cf '/. v U 0 0 0 0 0 0 o o o v 0 0 o a o 0 .? Z5 ..1 s ..1 6 t .J ...1 .w E V E CU E V E V ? V ° V E V E E 0 E U E E V E 0 E V E o E 0 E 0 E 0 E ..1 - .1 b ..] b ..] b ...) o V E V E Q ? V E W E V E E E 0 E q (+ C C C . C C C ' C C C I } o 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 o o K Q 0 - 0 ? 0 C 0 - 0 - 0 0 - o 2 o o d v, a 0 a 0 ?n 0 ?p p fc o (J e O 'n D D m 0 'n 0 ?n 0 v, 6 'n 0 ?n 0 ?n 0 to 0 0 v 0 0 h 0 n 0 n 0 .r, O v, O h O O h O h O v, O v, O 'n O O O g O 0 0 0 0 D o D O N 0 'n 0 'n 0 ?, 0 n 0 v, 0 'n V U V U V U V U V U V U V U 0 U V U V U U P v? p ?0 CJ O O O O ?n O 'n O 'n O 'n O 'n O 'n O v, O 'n O O 'n O 'n G 'n o c 0 c f 0 0 0 o p M1 = = a S S - 3 3 3 3 '" " , ' '? ? ? r '? o0 i 0 0 0 0 3 ' a ' 3 v 3 - 3 3 ' "' "' M' M' fn f^ U 'o 3 o o 3 o 'c 3 o 3 0 3 0 0 o 0 o 0 o 0 o c o o o' o c o o 0 o a' F F F F F F `r^ I^ F^ F^ F^ F F F F F F F F F F F F F f- F^ (- Vr W ? O N K I+ M P V '?1 <y In N V7 '/f Q r 1 - O fd 1+ V h K In N •^ O m W h p r- I h r h K h Vl h 'v h 1+ I+ h V? fD V' N Q V' r1 'V N 'V V. O h di o fq 'A M r W 0 11 M OP m K r, N . V .-, V P M1 w C C rT O O a W C K ol r C\ N fT ...• a O 0, Ot W W W h 00 V^ 00 '? 00 d' m f+M W N W B W O W O. M1 00 h dv C `V O h - h 1 h r h K h 'li h V' h W - 'n N N ?0 N ?U N S? N `V rI `•7 N N N N O N V N rY Y' d' K Q `D V0 `D 10 V' M 4? h h N Vi h Vl V1 Q Q a M1 CI N N N N N N - - - fr, N N N N rn t^ ? N N N N N N N N N N N N N NI N N N N - - a - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- - - - - - - - - - - -- - - - - - - - - - - - - 09 d ? f^. : d' e h e V' M1 dJ (T O 'n - N In K ?n V h n W Vf D\ O W O N O NM O Q V' '? O V' b r b W V' P 'U O h '+ [+ N M1 lr I d' M1 vl M1 V N M1 M1 J M1 (T M1 6 W N C/. K ' V ?'+ h ? ? O L1 -^ N P r^, G\ d' D\ O 0 -^ 0 N 0 ln, 0 K 0 N 0 b 0 C? 0 W 0 Gn 0 O - 0\ rP 6 O O N O P Q P ' O ? P I+ O CP C P O O -^ ^ N rr, Q 'It rG 1? CO U ^ O N - N N N Y N N U I M1 nl ? N C< r] O rn W rn N I^ M, , Q M, Vi M, V m h in 6] fr, O? Ir. O K rv cT N In M K V' V' '/1 Vr Q M1 Q rA Q Q Q O r- N fn K 'n n V' '? h '? . T N y N r N K N Q N Q N Q N N N N N n1 nl N rl N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N N rV V' V U' b V b ?] b f0 10 N In rn M In 11 11 M rl; M, rn In In M M, M [n m <? M In fr, m M M t^, rr rn M M, r rn M 1, rr; Nf r? rn M (r, Ih fn In lr, In M In M In to I* ° 0 u y ° 0 U i fi l - L I E - - - - L i l L _ lj _ _J _J _ L i_ t_ L _1 -J - L L L L _l L iJ _J _J _ a _ L - - - -- - - - - - - P O H p, ni o o o o M , T I Rl ni N I 7k I ? o 0 0 0 00 ?' ^ c aryo ? ? d0 C d0 h ` d., uJ V O N a N N N N ^ ? , C. O ro ? d ? ? b Cl p o o P o p P n d' v h e P q q q P O p O P p? , D a C a N N N N N N M O N ?? r (? r" W 1 d W tl it o n e n ' ?i ? ? ,M,vv y t^, r^ N n, in b QI ? m o a n d o o ? u 0.' p b ,. a ? o ? d O o W rn ,, a a w al p ?. ?. in. p P N a a a - 3 - - - - - - - - - - - - N W ? ? L ? ' d o o D O D O D d " cr o b M N ? b ? r6 d h o o D o 0 0 0 cl 0 cl o a o a ?n o b „ Q+ ? v, v, v ?t, v v v e v v v, ? o a+ ri "'. ?' ? o ni ri ri N ri N ri N N n N rn ? o? r y e d ? ? 4 a a a " " ' o c ' 'd a pp p o o o o o a o o b o o W F o s s a a a a o Y v a n] o 3 0 3 o s o o ` a b o o b r- r r- r ? n n n co h o. h o o0 N 0 r? rr D m v 0 r? o 0 rr 0 M h 0 r; w 0 M P, -- - - - - - - - - - - - Q - - - - ? L a o o y e, ? Q 00 ? P b b CI b rr, b H b V1 b b b h b W b ? ww ? ? ? y ? ? M, t^ r? rr, M r1 rr r ? u ti ? t7. O o W '0 A N p F ro o a ? d V U a c b J b J ~ ti n 3 _ C ? b U 3 J o a??Co ?ra U p b e -ni -, -r VI. SUBMITTAL, REQUIREMENTS Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ). A complete package includes all ofthe items listed below. The complete application package should be submitted to the DWQ Central Office. Please indicate that you have provided the following required information by initialing in the space provided next to each item. • Original and two copies of the Express Review Stormwater Management Application Initials • Signed and notarized Operation and Maintenance Agreement JF • Three copies of the applicable Supplement Norm(s) for each BMP _ JF • Application processing fee (payable to NCDENR) JF • Detailed narrative description of stormwater treatment/management JF • Three copies of plans and specifications, including: _ jr, - DevelopmentlProject name - Engineer and firm - Legend - North arrow - Scale - Revision number & date - Mean high water line - Dimensional property/project boundary - Location map with named streets or NCSR numbers - Original contours, proposed contours, spot elevations, finished floor elevations - Details of roads, drainage features, collection systems, and stormwater control measures - Wetlands and streams delineated, or a note on plans that none exist - Existing drainage (including off-site), drainage easements, pipe sizes, runoff calculations - Drainage areas delineated - Vegetated buffers (where required) VII. AGENT AUTHORIZATION If you wish to designate authority to another individual or firm so that they may provide information on your behalf, please complete this section. Designated agent (individual or firm): The John R. McAdams Mailing Address: PO Box 14005 City: RTP Plione: (919)361-5000 VIII. APPLICANT'S CERTIFICATION State: NC Zip: 27709 Fax: (919)361-2269 1, (]711171 or type nalne ofpers•on lis?ecl in General Information, item 2) i k 3a otr Q ,.'> ? w ` ;rx ,? Certify that the information included on this 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 pro used project complies with the requirements of 15A NCr1.C 211, 1000 Signature: -- Date: e? i 9/2004 Version I.0 Page 4 of4 _?, ?.. ????,.?? ??,t ?, __ __ ?. Permit No. (to be provided by DWQ) Forebay volume 18,329 J? Forebay % of permanent pool volume 19 % OK Temporary pool, surface area provided 33,014 fC Drawdown Calculations Treatment volume drawdown time 316 days OK Treatment volume discharge rate 0,43 —Note feis Pre -development 1 -yr, 24 -hr discharge See fOis OK Post -development 1 -yr, 24 -hr discharge 045 feis ON Additional Information Diameter of orifice 100 in Design TSS removal 85 % Basin side slopes 3 OK Vegetated shelf slope 6 .1 'z'Me ',S)lo ' [)(,a are too steep, maximum 10-11 <-- Vegetated shelf width 12 _:1 —ft OK AW -4t- lef" ori OM -*(— Length of flowpath to width ratio 1.37 .1 ']'so short, in'Nease rage tout lean 31 Length to width ratio 1.18 .1 Too shoft, if -Cfease rafirc, to at leas= 1,51 Trash rack for overflow & orifice? Y (Y or N) OK Freeboard provided 1.11 If OK PJ6 R)"WAft Vegetated filter provided? See Note (Y or N) OK V Ffav"O— eow6 vn(,lzw Recorded drainage easement provided? Y (Y or N) OK 5 Capures all runoff at ultimate build -out? Y (Y or N) OK Drain mechanism for maintenance or emergencies Y Form SW401-V%'et Detention Dash -Rev. 3 Parts 1. & 11. Design summary, Page 2 of 2 Permit (to be provided by DWQ) III , REQUIRED ITEMS CHECKLIST 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. Paget Plan Initials Sheet No. 7F M2E 1. Plans (1" 50' or larger) of the entire site showing: 5w2 Fxrrr6ir Design at ultimate build-out, fw F?Po? Off-site drainage (if applicable), Delineated drainage basins (include Rational C coefficient per basin), - Basin dimensions, Pretreatment system, High flow bypass system, Maintenance access, Recorded drainage easement and public right of way (ROW), Overflow device, and Boundaries of drainage easement. JI? f Q2?r- P0,7E 2. Partial plan (1" = 30' or larger) and details for the wet detention basin showing: Pp2-?-S 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. W(A- "1 F 3. Section view of the dry detention basin (1" = 20' or larger) showing: - Side slopes, 3:1 or lower, Pretreatment and treatment areas, and - Inlet and outlet structures, _xF ro'71A 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. TF 59 T 5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for forebay, to verify volume provided. TF ?D S. An assurance that the installed system will meet design specifications upon initial operation once the project is complete and the entire drainage area is stabilized. ?TF 0-2A 7. A construction sequence that shows how the wet detention basin will be protected from sediment until the entire drainage area is stabilized. DT- Sa 1 8. The supporting calculations. 13-F' oper Sff 9. A copy of the signed and notarized inspection and maintenance (I&M) agreement. 3F Xf rWtOhra T10. A copy of the deed restriction. A- Form SW401-Wet Detention Basin-Rev. 1 Part 111. Required Items Checklist, Page 1 of 1 Permit Number: (to be provided by DWQ) Drainage Area Number: wer fooo 4 Z Wet Detention Basin Inspection 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 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 inspection 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: Potential problem. How I will remediate the problem: The entire BMP Trash/debris is resent. 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 5W401-Wet Detention Basin I&M-Rev.2 Permit Number: (to be provided by DWQ) Drainage Area Number: txe7` ?" #L BMP element: Potential problem: How I will 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. 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 SO% of with pesticide (do not spray). the basin surface. Form SW401-Wet Detention Basin I&M-Rev.2 Permit Number: (to be provided by DWQ) Drainage Area Number:?W Q6Nd--*X BMP element: Potential problem: How I will remediate the problem: 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. 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 414.63 feet in the main pond, the sediment shall be removed. When the permanent pool depth reads 414.63 feet in the forebay, the sediment shall be removed. BASIN DIAGRAM 011 in the blanks) Sediment Removal Bottom Permanent Pool Elevation 419.5 414.63 Pe anen -------------- -- Volume 413.0 -ft Min. Sediment Storage FOREBAY Pool Sediment Removal Elevation 414,63 - - - - - - Volume Bottom Elevation 413.0 1 1-ft MAIN POND Storage Form SW401-Wet Detention Basin I&M-Rev.2 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. I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Project name: Briar Chapel -_Phase 4 BMP drainage area number: Wet Pond #2 Print name: :S)?ff__?covmi ti Title: 5X- P2dTdC fvO&F,2- r 600MMV177€ Address: I (P uiwpY x-&vu, cto2ct.sr G Wfk- tri" &/<- Z'7 $1(- Phone: (41191 Z35- 27-3 9$? Signature: 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. I, V - , a Notary Public for the State of A'N. C" OI l1 `? ?? Pte. , County of t)LI ,Ly , do hereby certify that r/1? .._>ra ?? ? personally appeared before me this day of and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal, W"Ili y z pU6 SEAL My commission expires C)?: . -)9 , ? Form SW401-Wet Detention Basin I&M-Rev.2 R M Basin bottom elevation Permit No. ft: Sediment cleanout elevation 428.12 (to be provided by DWQ) WMA 4. '*"'A* 431.00 C+� WDENR 433.00 It Top of shelf elevation STORMWATER MANAGEMENT PERMIT APPLICATION FORM it Temporary pool elevation 401 CERTIFICATION APPLICATION FOR It Volume and Surface Area Calculations ET DETENTION ASS SUPPLEMENT SAIDA ratio This form must be filled out, printed and submitted. {unitless} The Required Items Checklist (Part ill) must be printer, filled out and submitted along with aft of the required information. 1.:AR 'J T INFORMATION f# Volume at the bottom of shelf Protect name Briar Chapel - Phase 4 Permanent pool`, surface area required Contact person Jeremy Finch, PE Permanent pool, surface area provided Phone number 919.361-5000 Permanent pool volume Date 1012412008 Average depth for SAIDA tables Drainage area number To Wet Pond #3 Surface area at the top of shelf 17411 fe Volume at the top of shelf Site Characteristics ft" Drainage area 453,687 ftp Impervious area 186,602 fit % impervious 40.68178984 % Design rainfall depth 1,0 - in Storage Volume: Non-SRWaters Minimum volume required 10,027 ftp Volume provided 00,151 ftp Storage Volume: SIR Waters 1 -yr, 24 -hr runoff depth N/A in Pre -development 1 -yr, 24 -hr runoff NIA ft' Post -development 1 -yr, 24 -hr runoff NIA ft, Minimum volume required #VALUE! ft) Volume provided NIA fir Peak Flow Calculations Is pre/post control of the 1 -yr 24 -hr peak flour required? No -See Note (Y or hl) = f> 1 � � ' f 1 -yr, 24 -hr rainfall depth 3.0 in CEA -1 1 s 96&veo 6x( 6*00mri, Rational C, pre -development NiA {unitless} elovvry Rational C, post -development NIA (unitless) Rainfall intensity: 1 -yr, 24 -hr storm NIA inthr Pre -development 1 -yr, 24 -hr peak flaw NIA ft"Isec Post -development 1 -yr, 24 -hr peak flow N/A ft'isec Pre/Post Lr, 24 -hr peak flow control #VALUE ft/sec R M Basin bottom elevation 426.50 ft: Sediment cleanout elevation 428.12 It Bottom of shelf elevation 431.00 ft Permanent pool. elevation 433.00 It Top of shelf elevation 433.00 it Temporary pool elevation 435.50 It Volume and Surface Area Calculations SAIDA ratio 1.52 {unitless} Surface area at the boltorn of shelf 9714.00 f# Volume at the bottom of shelf 30842,00 ftp Permanent pool`, surface area required 7,428 ftp Permanent pool, surface area provided 17,411 fe CN Permanent pool volume 60,008 f Average depth for SAIDA tables 3.446556774 ft CN Surface area at the top of shelf 17411 fe Volume at the top of shelf 60008 ft" Form SW401-Wet Detention Basin-Rev.3 tarts L & #i. Des 'an Summary, Page I of 2 _. . IE, Ci!_i'?If.?Pd !?.'•F?f`)i?Cii'f,'-•..It.7!'J ?,_ . ?rr?_. I' ??.?'ia ?;v'J?.I ''?c' , Ira.+t?iti,?dri i,s?lc?.! icr::: ,.,;. r:... ? ... ???? ,?', . ? ,i _ mss ?; ': _ __ ?,?;,, i ,'r.r??,.?. r .._. ?fi-??i. .?I- ? ?,- -- ,s a? ????;. :I???;+r:? i?.?:;?itional ?rfo;??ra°,ii>:?i se? ? ?.? ?? _ _ ?'? Permit No. (to be provided by DWQ) 11 REQUIRED ?r MS CH XOS' T 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. 3"F fp?1--03D 1. Plans (1" - 50' or larger) of the entire site showing: 5wZ 60VO7 - Design at ultimate build-out, liv a0pr Off-site drainage (if applicable), Delineated drainage basins (include Rational C coefficient per basin), Basin dimensions, Pretreatment system, High flow bypass system, Maintenance access, Recorded drainage easement and public right of way (ROW), Overflow device, and Boundaries of drainage easement, QD3tE_? 2. Partial plan (130' or larger) and details for the wet detention basin showing: PD3-LS 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. N lk 3. Section view of the dry detention basin (1" = 20' or larger) showing: Side slopes, 3:1 or lower, Pretreatment and treatment areas, and Inlet and outlet structures. 7f eA'? 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. ?F 16E 1faA1 5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for forebay, to verify volume provided. ?DW 6. An assurance that the installed system will meet design specifications upon initial operation once the project is complete and the entire drainage area is stabilized. 7. A construction sequence that shows how the wet detention basin will be protected from sediment until the entire drainage area is stabilized. S-OWOLW g, The supporting calculations. :3F Siff 9. A copy of the signed and notarized inspection and maintenance (I&M) agreement. 5F 3Effrrs&-Ir10. A copy of the deed restriction.. Ak- Form SW401-Wet Detention Basin-Rev. 1 Part III. Required Items Checklist, Page 1 of 1 Permit Number: (to be provided by DWQ) Drainage Area Number: uA-r &0 *3 Wet Detention Basin Inspection 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 darn 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 inspection 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: Potential problem: How I will remediate the problem: The entire BMP Trash/debris is resent. 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. a roximatel six inches. Form 5W401-Wet Detention Basin I&M-Rev.2 Permit Number: (to be provided by DWQ) Drainage Area Number: %Aer?onO 4f3 BMP element: Potential problem: How I will 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. 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 s ra yin g. 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 I&M-Rev.2 Permit Number: (to be provided by DWQ) Drainage Area Number: tvGTQaq -#3 BMP element: Potential problem: How I will remediate the problem: 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. 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 428.12 feet in the main pond, the sediment shall be removed. When the permanent pool depth reads 428.50 feet in the forebay, the sediment shall be removed. BASIN DIAGRAM ill in the blanks) Sediment Removal Bottom V Permanent Pool Elevation 433.0 428.50 Pe nanen Pool - - - - - - - - - - - - - - - - Volume Sediment Removal Elevation 428.12 Volume 427.0 -ft Min.. "-----------"---------------------------- Sediment Bottom Elevation 426.5 1-13 r Storage Sedimea Storage FOREBAY MAIN POND Form SW401-Wet Detention Basin I&M-Rev.2 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. I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Project name: Briar Chapel - Phase 4 BMP drainage area number: Wet Pond Print name: 'Seff 5to N Title: SR. P r,- A6vi6NO GdMev+vNrr&-S Address: UP wo-ox lwour ctrecL4 lt, WY,,, ??- 2751(0 Phone: fgG 2Z,? 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. I, y kp_"OQ ? • , a Notary Public for the State of ljo n ? D.? A&. , County of hip ?aJn/-' , do hereby certify that personally appeared before me this day of , and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal, yi1111i1141iifli j? ()TA1p? a•=,, "•?M co .,-.ol SEAL My commission expires I Form SW401-Wet Detention Basin I&M-Rev.2 ` I .i.. 7HIMMON _1M= 0 VC J _., „ , _,.. 0444, ^C n ;:r "No, , arc r .... ,., Way, FKv Ca:culrticr?:; -- - :wi ;:'sic _s r? f='ct?ations :i f 5 wan Permit No. (to be provided by DWQ) Forebay volume 32,754 fe Forebay % of permanent pool volume 21 % kJ Temporary pool, surface area provided 42,342 ftp Drawdown Calculations Treatment volume drawdown time 4 31 days OK Treatment volume discharge rate 4.33 fees Pre -development 1 -yr, 24 -hr discharge See Dote feesOK Post -development 1 -yr, 24 -far discharge 1.46 fels CK Additional Information Diameter of orifice 3.44 in Design TSS removal 85 °l Basin side slopes 3 :1 O Vegetated shelf slope 6 :1 ;tide ",lolar=s are too area p, maximum 10:1 Vegetated shelf width 12 It OK u}) L IMI Length of flowpeth to width ratio 2.41 :1 Ton short, il.mrrease , atio 10 at least 3:1 Length to width ratio 2.46 .1 CCK Trash rack for overflow & orifice? Y tY or Nj OK" Freeboard provided 0.71 ft MA enough ffeeboard, minirnun, of 1, -ft required Vegetated filter provided? See Note (Y or ) 0K V E X10OW,sr RI W4 AVI 0 Recorded drainage easement provided? Y (Y or N) OKOffrR> VMAZZO^r - r Capures all runoff at ultimate build -out? Y (Y or N) 0 Drain mechanism for maintenance or emergencies Y Form SW401-Wet Detemion Basin-Rev.3 Farts 1. & JI. Design Summary, Page 2 of 2 Permit No. (to be provided by DWQ) III.REQE?IRED ITEMS CHECKL{ST 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. TF fQI - N6 1. Plans (1" - 50' or larger) of the entire site showing: Sw2 rxf+rpf Design at ultimate build-out, lu RFW Off-site drainage (if applicable), Delineated drainage basins (include Rational C coefficient per basin), Basin dimensions, Pretreatment system, High flow bypass system, Maintenance access, Recorded drainage easement and public right of way (ROW), Overflow device, and - Boundaries of drainage easement. -Tr PDyI}' e0 ql" 2. Partial plan (1" = 30' or larger) and details for the wet detention basin showing: Rbq_L.$ - 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. MA- 1-44' 3. Section view of the dry detention basin (1" = 20' or larger) showing: Side slopes, 3:1 or lower, Pretreatment and treatment areas, and - Inlet and outlet structures. U'r- P?'`IA 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. IF SEA 5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for Forebay, to verify volume provided. 6. An assurance that the installed system will meet design specifications upon initial operation once the project is complete and the entire drainage area is stabilized. e0-Yff 7. A construction sequence that shows how the wet detention basin will be protected from sediment until the entire drainage area is stabilized. I? Sct " 8. The supporting calculations. _SF '5f;E 9. A copy of the signed and notarized inspection and maintenance (I&M) agreement. 5fEA1M +ri r 10. A copy of the deed restriction. A- Form SW401-Wet Detention Basin-Rev.1 Part III. Required Items Checklist, Page 1 or 1 Permit Number: (to be provided by DWQ) Drainage Area Number: IteT Pb&Q # 4t, Wet Detention Basin Inspection 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 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 inspection 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: Potential problem: How I will remediate the problem: The entire BMP Trash/debris is resent. 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. a roximatel six inches. Form SW401-Wet Detention Basin I&M-Rev.2 Permit Number. (to be provided by DWQ) Drainage Area Number: 6,1' f" 4?4 BMP element: Potential problem: How I will 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. 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 it 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 I&M-Rev.2 Permit Number: (to be provided by DWQ) Drainage Area Number: u-ET Po&O BMP element: Potential problem: How I will remediate theroblem: 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. 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 414.50 feet in the main pond, the sediment shall be removed. When the permanent pool depth reads 414.50 feet in the forebay, the sediment shall be removed. BASIN DIAGRAM ill in the blanks) Sediment Removal Bottom Permanent Pool Elevation 419.0 414.50 1 Pe manen -------------- -- Volume 413.0 -ft Min. Sediment Storage FOREBAY Pool Sediment Removal Elevation 414.50 Volume -------------------------------------------- ------ I Bottom Elevation MAIN POND 11 "ft n. Sedimen Storage Form SW401-Wet Detention Basin I&M-Rev.2 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. I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Project name: Briar Chapel - Phase 4 BMP drainage area number: Wet Pond #4 Print name: J6K Scowl Title: 69. P2&T%cr" mt4t -6&f- - A1U JLArrO comol-mIT760 Address: 14 WO-DY K ewct_ Cco&I-+- CHAP6,IL- Ne- 2,-151& Phone: (1719)- 2 Signature: 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. R a Notary Public for the State of hYL ^$1; ?1?_ , County of ?n_, do hereby certify that personally appeared before me this day of and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal, .......u.e.+.,, ,e E. ?nTA,4? T? SEAL My commission expires 1 Form SW401-Wet Detention Basin I&M-Rev.2 r?,o . ' f, .' c??: ? ? rrr_ I > . Permit No. (to be provided by DWQ) [.II', R?QljIF2ED l1'EMS C:HEC?C?IST 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. Paget Plan Initials Sheet No. S? e05Ff -? 1. Plans (1" 50' or larger) of the entire site showing: 5W2_ 6)mj tf Design at ultimate build-out, 1W fig- Off-site drainage (if applicable), Delineated drainage basins (include Rational C coefficient per basin), Basin dimensions, Pretreatment system, High flow bypass system, Maintenance access, - Recorded drainage easement and public right of way (ROW), - Overflow device, and Boundaries of drainage easement. 2. Partial plan (f" = 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. MIA N?A- 3. Section view of the dry detention basin (120' or larger) showing: Side slopes, 3:1 or lower, Pretreatment and treatment areas, and Inlet and outlet structures. .TF Q"A_ 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. 5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for forebay, to verify volume provided. 6. An assurance that the installed system will meet design specifications upon initial operation once the project is complete and the entire drainage area is stabilized. 3T_ fp 5A- 7. A construction sequence that shows how the wet detention basin will be protected from sediment until the entire drainage area is stabilized. J_F" S*E"off 8. The supporting calculations. J_F'_ J44 1W647- 9. A copy of the signed and notarized inspection and maintenance (I&M) agreement. 5710. A copy of the deed restriction, Form SW401-Wet Detention Basin-Rev.1 Part III. Required Items Checklist, Page 1 of 1 Permit Number: (to be provided by DWQ) Drainage Area Number: w er Po. %D #-5 Wet Detention Basin Inspection 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 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 inspection 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: Potential problem: How I will remediate the problem: The entire BMP Trash/debris is resent. 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 I&M-Rev.2 Permit Number: (to be provided by DWQ) Drainage Area Number: wET OA4 *5 BMP element: Potential roblern: How I will 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. 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, phragntites 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 I&M-Rev.2 Permit Number: (to be provided by DWQ) Drainage Area Number: tt, r fo&o $t5 BMP element: Potential problem: How I will remediate the problem: 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. 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 429.63 feet in the main pond, the sediment shall be removed. When the permanent pool depth reads 429.63 feet in the forebay, the sediment shall be removed. BASIN DIAGRAM ill in the blanks) Sediment Removal Bottom Permanent Pool Elevation 434.5 429.63 Pe anen? ._____________ __ Volume 428.0 -ft Min. Sediment Storage FOREBAY Pool Sediment Removal Elevation 429'63 Volume -------------------------------------------- _._..__, Bottom Elevation MAIN POND 1-ft n. Sedimen Storage Form SW401-Wet Detention Basin I&M-Rev.2 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. I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Project name: Briar Chapel Phase 4 BMP drainage area number: Wet Pond #5 Print name: : ff 5 covj6,J Title: 512• FROraT mA%,A&64- v , r Address: 1& W&W gjwu- ajac?e CfWu- tf( , We... 27516 2238 Phone: (91q) Signature: Date: f 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. Aj? , a Notary Public for the State of County of do hereby certify that ?'- ran personally appeared before me this day of 9r _ , and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal, ............o...... E. Wy?T `I- -? AR y F ? 0 z .dG PUS nn GOJ9. "hxne.eonn . SEAL My commission expires 0 20 Form SW40I-Wet Detention Basin I&M-Rev. 2 n't Q 11 R, 01,11 1:'C"I ------ ??S WAR j Ili:. r_ l.•?. ','1 .. i Ic.l I;• I I ? t=!,7rs Ln mm . -nl un or' joy U rl (Is, i 3 my I '. &hA i i _- Forebay volume Forebay % of permanent pool volume Temporary pool, surface area provided Drawdown Calculations Treatment volume drawdown time Treatment volume discharge rate Pre-devetopment 1 -yr, 24 -hr discharge Post -development 1 -yr, 24 -hr discharge Additional Information D'ameter of orifice Design TSS removal Basin 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 Permit No. (to be provided by DWQ) 7,227 ft' 18 % Must be approx, 20%, Adiustoond dimensions 1f,861 ftp 3,48 days 'K 0.16 fels See Note fels 111 ftaf5 ")S 2.00 in 85 % 3 6 1 Side Slopes are wo steep. roaxi-i-murn 10:1 MI pi 6&Q 12 ft 0K - 2.13 :1 —oo short, increase rates to at least 3:1 2,5 :1 OK Y (Y or N) OK 0.83 It Not enough freeboard, rninirnum. of 1—ft required See Note (Y or N) OK =(—WMA1& Pot,-"7ff#r" IRIPAPOov OWWX Y (Y or N) OK o 6FIO'G VOWUP tt Y (Y or N) OK Y Form SW401 -Wet Detention Basin-Rev.3 Parts 1. & 11. Des an Summary, Page 2 of 2 Permit (to be provided by DW4) III''.REQUiRED .IT?M$CM..ECKLI$T 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. SF D61q--fX P 1. Plans (1" - 50' or larger) of the entire site showing: 5wZ FMtraN - Design at ultimate build-out, [4/ tCoWoAr - Off site drainage (if applicable), Delineated drainage basins (include Rational C coefficient per basin), Basin dimensions, Pretreatment system, High flow bypass system, Maintenance access, Recorded drainage easement and public right of way (ROW), Overflow device, and Boundaries of drainage easement. TV' If066 06119 2. Partial plan (1" W 30' or larger) and details for the wet detention basin showing: ?Ob -r?S 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. Jllr+? 3. Section view of the dry detention basin (1" = 20' or larger) showing: Side slopes, 3:1 or lower, Pretreatment and treatment areas, and Inlet and outlet structures. Jr b? 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. ?F 0000- 5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for forebay, to verify volume provided. 6. An assurance that the installed system will meet design specifications upon initial operation once the project is complete and the entire drainage area is stabilized. ,Tr_ 7. A construction sequence that shows how the wet detention basin will be protected from sediment until the entire drainage area is stabilized. Jir_ Sjr-? 8, The supporting calculations. 5f,.. &€tW_ 9. A copy of the signed and notarized inspection and maintenance (I&M) agreement. 19"W . A copy of the deed restriction. rf4?- Form SW401-Wet Detention Basin-Rev.1 Part lll. Required Items Checklist, Page 1 of 1 Permit Number: (to be provided by DWQ) Drainage Area Number: wEr po" 3t6 Wet Detention Basin Inspection and Maintenance Agreement I will keep a maintenance record on this BMP. ' This maintenance record will be kept in a Iog 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 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 inspection 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: Potential problem: How I will remediate the problem: The entire BMP Trash/ debris is resent. 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 I&M-Rev.2 Permit Number: (to be provided by DWQ) Drainage Area Number: 7r?u?0 :G BMP element: Potential problem: How I will 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. 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 their invasive plants cover 50% of with pesticide (do not spray). the basin surface. Form SW40I-Wet Detention Basin I&M-Rev.2 Permit Number: (to be provided by DWQ) Drainage Area Number: 0.7- 00rwD#6 BMP element: Potential problem.- How I will remediate the problem: 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. 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 445.75 feet in the main pond, the sediment shall be removed. When the permanent pool depth reads 445.75 feet in the forebay, the sediment shall be removed. BASIN DIAGRAM ill in the blanks) Q Permanent Pool Elevation 451.0 Sediment Removal .445.75 Pe manen Pool ----------------- volume Sediment Removal Elevation 445.75 Volume -------------------------------------------- ------ Bottom ra evah 444.0 -ft Min. Sediment Bottom Elevation 444.0 1-ft n Storage Sedimer Storage FOREBAY MAIN POND Form SW401-Wet Detention Basin I&M-Rev.2 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. I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Project name: Briar Cha el - Phase 4 BMP drainage area number: Wet Pond Print name: SEA r? Title: !? R- PeAT60" /h 6i2- ? comy_nvnrr Tr FS Address: 14 jmwoy KUN.rr c ( xf r-- C Hijac i4litiq ,&1( 2,-1,5y. P S E I, J , a Notary Public for the State of ' County of tx I i'n , do hereby certify that personally appeared before me this day of _.P)?, ?7)6 and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal, Wye ., -,?TOJ A R y rF°- - U Z aG pUi3`,` tA, 'r R J y SEAL My commission expires . 2% X) I Form SW401-Wet Detention Basin I&M-Rev.2 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. lii5 ?? s - ---- -- - - -- - t ' r Permit N (to be provided by DWQ) 111 ,REQUIREa CHECKLIST 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. pplA-Por F_ 1. Plans (1" 50' or larger) of the entire site showing: `WZ FK["Olr - 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, Recorded drainage easement and public right of way (ROW), Overflow device, and - Boundaries of drainage easement, T!~ ft Pots 2. Partial plan (1" = 30' or larger) and details for the wet detention basin showing: P?t'is 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. ti I N?? 3. Section view of the dry detention basin (1" = 20' or larger) showing: Side slopes, 3:1 or lower, Pretreatment and treatment areas, and - Inlet and outlet structures. ?r?-Irlt 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. yEC F>r 5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for.forebay, toverify volume provided, PD-tF} 6. An assurance that the installed system will meet design specifications upon initial operation once the project is complete and the entire drainage area is stabilized. TF et7?? 7. A construction sequence that shows how the wet detention basin will be protected from sediment until the entire drainage area is stabilized. TF 566 8. The supporting calculations. 51tf l 9. A copy of the signed and notarized inspection and maintenance (I&M) agreement. 10. A copy of the deed restriction. Form SW401-Wet Detention Basin-Rev.1 Part III. Required Items Checklist, Page 1 of 1 Pen-nit Number: (to be provided by DWQ) Drainage Area Number: WET fbNO 1:0 J Wet Detention Basin Inspection 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 Z 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 inspection 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: Potential problem: How I will remediate the problem: The entire BMP Trash/ debris is resent. 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. a roximatel six inches. Form SW401-Wet Detention Basin I&M-Rev.2 Permit Number: (to be provided by DWQ) Drainage Area Number: WCf fo.uo -*,- BMP element: Potential problem: How I will 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. , 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 I&M-Rev.2 Permit Number: (to be provided by DWQ) Drainage Area Number: wer PoNO a?.L BMP element: Potential roblenr. How I will remediate the problem: 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, 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 405.5 feet in the main pond, the sediment shall be removed. When the permanent pool depth reads 410.5 feet in the forebay, the sediment shall be removed. BASIN DIAGRAM (fill in the blanks) Sediment Removal Bottom Permanent Pool Elevation 410.0 410.5 YPe manen Pool olume Sediment Removal Elevation 405.5 Volume Min. -__-__---......-------------------------------- ------ ediment Bottom. Elevation 404.0 1-ft n Storage Sedimer Storage FOREBAY MAIN POND Form SW401-Wet Detention Basin I&M-Rev.2 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. I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Project name: Briar Chapel - Phase 4 BMP drainage area number: Wet Pond #1 Print name: SfW 5coyrfN Title: 5P-. eCz%cr !YlAm'6ff- ` FAQ c-'m n rfIES Address: I& La(OJDY Knit- Grem C CtWu, H19. N,-- 2-71$14 Phone: N-t) _23? 8 Signature: 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. I, ' om? 1 9. - O) , a Notary Public for the State of Nod-JA , 6, , County of _0 ug LA , do hereby certify that , ? ??' p<ar.?T- 1 personally appeared before me this. , and acknowledge the due execution of the day of Ot JobeAL 201 forgoing wet detention basin maintenance requirements. Witness my hand and official seal, ,NIIfN11H1 •11,1'111„If ff•,?? %?Iv ••'''S?E E' Wr/Y **I, i. 0 i? IOU AMC J •°4f? SEAL 1 My commission expires $ , 20 Form SW401-Wet Detention Basin I&M-Rev.2