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HomeMy WebLinkAbout20061804 Ver 5_Stormwater Info_20151030Soil & Environmental Consultants, PA 8412 Falls of Neuse Road, Suite 104, Raleigh, NC 27615 • Phone: (919) 846 -5900 • Fax: (919) 846 -9467 sandec.com October 30, 2015 S &EC Project # 6658.P6 To: NC DWR, 401 & Buffer Permitting Unit Attn: Karen Higgins Archdale Building — 9th Floor 512 N. Salisbury Street /� I� Raleigh, NC 27604 v Re: The Village at Flowers Plantation Stormwater Management Plan -POD 10 -Phase One DWQ Project #20061804, Ver.5 /Gertification No. 3766 Johnston County, NC On behalf of Mrs. Rebecca Flowers, please find the attached Stormwater Management Plan for POD 10 -Phase One. According to the Individual 401 Water Quality Certification Approval Certification No. 3766, Condition No. 9, "a final, written stormwater management plan for each phase of this project shall be submitted to the DWQ 401 Oversight/Express Permitting Unit for review and approval ". Therefore, please see attached Stormwater Management Plan for your review and anticipated Approval. Please contact me at DShirlev(o),SandEC.com or (919) 846- 5900 if you have any questions. Sincerely, Soil & Environmental Consultants, PA L L Deborah E. Shirley Environmental Specialist Attachments:' �' 2 1) Flowers Plantation Pod 10 Sitework Calculations 2) Bioretention Operations & Maintenance Agreement- signed and notarized f 3) Flowers Plantation -North East Quad Master Lot Layout OCT 3 0 2015 , 4) POD -10 Grading Plan DENR • OF TER RESOURCES 401 8 BUFFER PERMITTING &iii!��������lili'll'Ill'ill,�������������������������������������������������������������������������l������������������������� ;Siftework Calculi Flowers Plantation Evergreen Pod 10 =��vn�clDe��lo;p�e� fRebecca F - bW6r --s '4 }88 -N� -2- �E�as Pone X840_} 34{359 is ,op00000000000ao pop �>ot+ CA1fd� DO �� epeoe000°ea i 1 °4 ° SEAL O p S m �gOg� °0000ao 0 a STOCKS ENGINEERING, P.A. 1100 Eastern avenue Phone: 252.459.8196 PO Box 1108 Fax: 252.459.8197 Nashville, NC 27856 Mobile: 252.903.6891 Email: mstocks @stocksengineering.com ®M& .ser NC®ENR Permit Number, (to be provided by D WQ) O�o� W A7FgQG y > y O T STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM BIORETENTION CELL SUPPLEMENT This form must be filled out, printed and submitted. The Required Items Checklist (Part 11!) must be printed, filled out and submitted along with all of the required information. : :� I:'PR JECT 1 FORMA 10 ,. , .. , a ,..r .. , .. � ; =� =�:'. - 0 iV •�,. Project name Evergreen Phase 1 - Pod NE 10 Contact name Kevin Vamell Phone number 252.459.8196 Date July 23, 2015 Drainage area number 1 III. -,DESIGN INFORMATION: Site Characteristics Drainage area 222,987 ft' Impervious area 77,540 f? Percent impervious 34.8% % Design rainfall depth 1.0 inch Peak Flow Calculations Is prelpost control of the 1 -yr, 24 -hr peak flow required? Y (Y or N) 1 -yr, 24 -hr runoff depth 3 in 1 -yr, 24 -hr intensity 0.12 in/hr Pre - development 1 -yr, 24 -hr peak Flow 0.411 ft' /sec Post - development 1 -yr, 24 -hr peak flow 0.401 ft' /sec Pre /Post 1 -yr, 24 -hr peak control -0.010 h3 /sec Storage Volume: NonSA Waters Minimum volume required 6,877.0 ft' Volume provided 7,437.0 It OK Storage Volume: SA Waters 15' runoff volume It Pre - development 1 -yr, 24 -hr runoff ft' Post - development 1 -yr, 24 -hr runoff It Minimum volume required 0 ff3 Volume provided ft Cell Dimensions Ponding depth of water 12 inches OK Ponding depth of water 1.0011 Surface area of the top of the bioretention cell 7,437.0 ft OK Length: fl Width. fl -or- Radius ft Media and Soils Summary Drawdown time, ponded volume 6 hr OK Drawdown time, to 24 inches below surface 18 hr OK Drawdown time, total: 24 hr In -situ soit Sal permeability 0.10 in/hr Insufficient. Increase infiltration rate or include underdrains. Planting media soil: Sol] permeability 2.00 in/hr OK Soil composition % Sand (by volume) 86% OK % Fines (by volume) 10% OK % Organic (by volume) 4% OK Total: 100% Phosphorus Index (P- Index) of media 30 (unilless) OK Form SW401- eioretention -Rev.8 i June 25, 2010 Parts I and II. Design Summary, Page 1 of 2 Permit Number. (to be provided by DWQ) Basin Elevations Excess volume must pass through filter. Temporary pool elevation 287.00 fmsl Type of bioretenlion cell (answer 'Y' to only one of the two Show how flow is evenly distributed. following questions). OK Is this a grassed cell? Y (Y or N) OK Is this a cell with treeslshrubs? N (Y or N) Planting elevation (top of the mulch or grass sod layer) 288 fmsl Depth of mulch inches Bottom of the planting media soil 284 fmsl Planting media depth 2 It Depth of washed sand below planting media soil 0.33 ft Are underdrains being installed? Y (Y or N) How many clean out pipes are being installed? What factor of safety is used for sizing the underdrains? (See BMP Manual Section 12.3.6) Additional distance between the bottom of the planting media and the bottom of the cell to account for underdrains Bottom of the cell required SHWT elevation Distance from bottom to SHWT Internal Water Storage Zone (IWS) Does the design include IWS Elevation of the top of the upturned elbow Separation of IWS and Surface Planting Plan Number of tree species Number of shrub species Number of herbaceous groundcover species Additional Information Does volume in excess of the design volume bypass the bioretention cell? Does volume in excess of the design volume flow evenly distributed through a vegetated filter? What is the length of the vegetated filter? Does the design use a level spreader to evenly distribute flow? Is the BMP located at feast 30 feet from surface waters (50 feet V SA waters)? Is the BMP located at least 100 feet from water supply wells? Are the vegetated side slopes equal to or less than 3,19 Is the BMP located in a proposed drainage easement with access to a public Right of Way (ROW)? Inlet velocity (from treatment system) Is the area surrounding the cell likely to undergo development in the future? Are the slopes draining to the bioretenlion cell greater than 20 %? Is the drainage area permanently stabilized? Pretreatment Used (Indicate Type Used with an 'X" in the shaded cell) Gravel and grass (flinches gravel followed by 3 -5 ft of grass) Grassed swale Forebay Other 8 OK 2 OK 1 ft 282.67 fmsl 278.25 fmsl 4.42 ft OK N (Y or N) fmsl 286 ft 0 Y (Y or N) OK N (Y or N) Excess volume must pass through filter. ft N (Y or N) Show how flow is evenly distributed. Y (Y or N) OK Y (Y or N) OK Y (Y or N) OK Y (Y or N) OK 0.52 fUsec OK N (Y or N) OK N (Y or N) OK Y (Y or N) OK X OK Form SW401- 13iorelention -Rev.8 June 25, 2010 Parts I and It Design Summary, Page 2 of 2 Permit No (to be assigned by DWQ) IIIL 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. Page/ Plan Initials Sheet No. Plans (1" - 50' or larger) of the entire site showing: Design at ultimate build -out, Off -site drainage (if applicable), Delineated drainage basins (include Rational C coefficient per basin), Cell dimensions, Pretreatment system, High flow bypass system, Maintenance access, Recorded drainage easement and public right of way (ROW), Clean out pipe locafions, Overflow device, and Boundaries of drainage easement. 2. Plan details (1" = 30' or larger) for the bioretention cell showing- - Cell dimensions - Pretreatment system, - High flow bypass system, - Maintenance access, Recorded drainage easement and public right of way (ROW), Design at ultimate build -out, Off -site drainage (if applicable), Clean out pipe locations, - Overflow device, and Boundaries of drainage easement. Indicate the P -Index between 10 and 30 3. Section view of the bioretention cell (1' = 20' or larger) showing: Side slopes, 3:1 or lower Underdrain system (if applicable), and Bioretention cell layers [ground level and slope, pre - treatment, ponding depth, mulch depth, fill media depth, washed sand, filler fabric (or choking stone if applicable), #57 stone, underdrains (if applicable), SHWT level(s), and overflow structure] 4. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. The results of the soils report must be verified in the field by DWQ, by completing & submitting the soils investigation request form. County sod maps are not an acceptable source of soils information. All elevations shall be in feet mean sea level (fmsl). Results of soils tests of both the planting soil and the in situ soil must include- Soil permeability, Sal composition (% sand, % fines, % organic), and P- index. 5. A detailed planting plan (1" = 20' or larger) prepared by a qualified individual showing A variety of suitable species, Sizes, spacing and locations of plantings, Total quantity of each type of plant specified, A planting detail, The source nursery for the plants, and Fertilizer and watering requirements to establish vegetation. 6. A construction sequence that shows how the bioretention cell will be protected from sediment until the entire drainage area is stabilized. 7. The supporting calculations (including underdrain calculations, if applicable). 8. A copy of the signed and notarized inspection and maintenance (I &M) agreement. 9, A copy of the deed restriction. Form SW401- Bioretention -Rev -7 Part III, Page 1 of 1 i �2 Lit, Q- Z-19•o o� Sa v o� cam 3 ed'£�� � � �3:� ® : -� �� �2* 7�� � ` �� / / _ � _ �� / � ��� � / : @ C£`G) � aj . � � �� � � ) ( ` � 90 'U � � ' � � /�� � _� � I `! - ` /� \�9 =x /S�j] , 2 ) _ � �` �- _� , j A�o 3 J `�� � � v» � � < ' � � Q�`o = � ' - ®� ® �� -�� � /4� \y 9,�: '�zc {Q )�. . -- % %2 .� ,�,��_� __�,�...��._��- .g /«r /�= \ ©� �$q�S9�� -r -Q fs %«� y, t I �l h1- = r� Ll ss�7� i 11.3 Pit Q 1� - i f I 4n-.) one Watershed Model Schematic 1 - Pre Development CD Hydraflow Hydrographs by Intelisolve v9.22 2 - Post Development v 3 - Outflow Project: Pre vs Post.gpw I Wednesday, Jul 29, 2015 2 Hydrograph Return Period Recap Hydraflow Hydrographs by Intelisolve v9 22 Hyd. Hydrograph Inflow Peak Outflow (cfs) Hydrograph No. type Hyd(s) description (origin) 1 -Yr 2 -Yr 3 -Yr 5-Yr 10 -Yr 25 -Yr 50 -Yr 100 -Yr 1 SCS Runoff - - - - -- 0.411 – – - – – – – – - - - - - -- - - - - - -- - - ----- Pre Development 2 SCS Runoff - - - - --- 6660 ------- - - - - --- - - - -- - -- — - - - - - -- - - - - - -- Post Development 3 Reservoir 2 0.401 - - - - - -- - - - - -- - -•- — -- — – – -- Outflow Proj. file: Pre vs Post.gpw I Wednesday, Jul 29, 2015 Hydrograph Summary report Hydraflow Hydrographs by Intelisolve v9.22 Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph No. type flow interval peak volume hyd(s) elevation strge used description (origin) (cfs) (min) (min) (cult) (ft) (curt) 1 SCS Runoff 0.411 2 720 2,902 - - -- - - - Pre Development 2 SCS Runoff 6.660 2 720 15,598 - -- --- - - -- Post Development 3 Reservoir 0.401 2 808 7,456 2 287.04 8,505 Outflow Pre vs Post.gpw Return Period: 1 Year Wednesday, Jul 29, 2015 Hydrograph Report Hydraflow Hydrographs by Intelisolve v9.22 Hyd. No. 1 Pre Development Hydrograph type = SCS Runoff Storm frequency = 1 yrs Time interval Drainage area Basin Slope Tc method Total precip. Storm duration Q (cfs) 0.50 0.45 0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 2 min 5.120 ac 3.0% KIRPICH 2.89 in 24 hrs Pre Development Hyd. No. 1 — 1 Year 0.00 - . 0 2 4 6 8 10 12 Hyd No. 1 2 Wednesday, Jul 29, 2015 Peak discharge = 0.411 cfs Time to peak = 12.00 hrs Hyd. volume = 2,902 cuft Curve number = 55 Hydraulic length = 900 ft Time of conc. (Tc) = 5.66 min Distribution = Type II Shape factor = 484 Q (cfs) 0.50 0.45 0.40 0.35 0.30 0.25 0.20 0.15 0.10 ...... 0.05 0.00 14 16 18 20 22 24 26 Time (hrs) Hydrograph Report Hydraflow Hydrographs by Intelisolve v9.22 Hyd. No. 2 Post Development Hydrograph type = SCS Runoff Storm frequency = 1 yrs Time interval Drainage area Basin Slope Tc method Total precip. Storm duration Q (cfs) 7.00 . OU M 4.00 2 min 5.120 ac 2.0% KIRPICH 2.89 in 24 hrs Post Development Hyd. No. 2 -- 1 Year Wednesday, Jul 29, 2095 Peak discharge = 6.660 cfs Time to peak = 12.00 hrs Hyd. volume = 15,598 cuft Curve number = 74 Hydraulic length = 1100 ft Time of cons. (Tc) = 7.73 min Distribution = Type II Shape factor = 484 Q (cfs) 7.00 6.00 5.00 4.00 3 -00 3.00 2.00 i 2.00 1.00 1.00 0.00 :..:.:..... -:_ _.- ., 0.00 0 2 4 6 8 10 12 14 16 18 20 22 24 26 Hyd No. 2 Time (hrs) Hydrograph Report Hydraflow Hydrographs by Intelisolve v9.22 Hyd. No. 3 Outflow Hydrograph type = Reservoir Storm frequency = 1 yrs Time interval = 2 min Inflow hyd. No. = 2 -Post Development Reservoir name = Bioretention Storage Indication method used Q (cfs) 7.00 .M 5.00 4.00 3.00 2.00 1.00 Outflow Hyd. No. 3 -- 1 Year 6 Wednesday, Jul 29, 2015 Peak discharge = 0.401 cfs Time to peak = 13.47 hrs Hyd. volume = 7,456 cuft Max. Elevation = 287.04 ft Max. Storage = 8,505 cuft Q (cfs) 7.00 6.00 5.00 4.00 3.00 2.00 1.00 0.00 a...... :,.......... 0.00 0 2 4 6 8 10 12 14 16 18 20 22 24 26 Time (hrs) Hyd No. 3 Hyd No. 2 [TTH11 T1 Total storage used = 8,505 cult Ponca Report 7 HydraFlow Hydrographs by Intelisolve v9.22 Wednesday, Jul 29, 2015 Pond No. 1 - Bioretention Pond Data Contours - User - defined contour areas. Average end area method used for volume calculation. Begining Elevation = 286.00 ft Stage / Storage Table Stage (ft) Elevation (ft) Contour area (sqft) incr. Storage (cuft) Total storage (cuft) 0.00 286.00 7,437 0 0 1.00 287.00 8,844 8,141 8,141 2.00 288.00 10,307 9,576 17,716 2.50 288.50 11,827 5,534 23,250 Culvert/ Orifice Structures Weir Structures [A] [B] [C] [PrfRsr] [A] [B] [C] [D] Rise (in) = 1800 000 0.00 0.00 Crest Len (ft) = 10.00 0.00 0.00 0.00 Span (in) = 18.00 0.00 000 0.00 Crest El. (ft) = 287.00 0.00 0.00 0.00 No. Barrels = 1 0 0 0 Weir Coeff. = 3.33 3.33 3.33 3.33 Invert El. (ft) = 281.00 0.00 0.00 0.00 Weir Type = Riser - -- - -- -- Length (ft) = 50.00 000 0.00 0.00 Multi -Stage = Yes No No No Slope ( %) = 10.00 0.00 000 n/a N -Value = .013 013 .013 n/a Orifice Coeff. = 0.60 060 0.60 0.60 Exfil.(in /hr) = 0.000 (by Contour) Multi -Stage = n/a No No No TW Elev. (ft) = 0.00 Note Culvert /Onfice outflows are analyzed under inlet (ic) and outlet (oc) control. Weir risers checked for orifice conditions (Ic) and submergence (s) Stage (ft) 300 W#111 1.00 0.00 0.00 200 Total Q Stage / Discharge Elev (ft) 289.00 287.00 286.00 4.00 6.00 8.00 1000 12.00 14.00 16.00 18.00 2000 22.00 Discharge (cfs) �... is.e n. i.:a.r ie. s.r.•:..uiruran iei.n.. u.,.eus.� a�sm ..e.m�n�s.:. u.,a n,.sw �.i.ra.�.. e. s.ia..�...r. sa,��:ea,;ui,,_�..i,i w.. �+.e,�..,:.��.m, ..am. rtka�u. n:..s. :u a, aeu �� +�� Soil & Environmental Consultants, PA 8412 I'altti uf ticii r )juait. Suuc lu -S, Raleigh, \f: 761 • I'tu>nc (')P ) 846 WX) • F.ux OP)) 840 9467 i,unicL com April 20, 2015 Job # 6658.54 DWF c/o Stocks Engineering Attn: Mike Stocks PO Box 1 108 Nashville, NC 27856 Re: Detailed storm water soils evaluation for the proposed storni water Bioretention area at Flowers Plantation, Evergreen POD 10, Johnston County. NC. Dear Mr. Stocks: Soil & Environmental Consultants, PA (S &EC) perfornied a detailed soil evaluation within the targeted area of a potential stone water basin on the site mentioned above. The purpose of' this evaluation was to provide additional information fi)r the proper design of the proposed bioretention area, used as a BM13 to treat the on -site storm water. Soil morphological profile descriptions were performed at the specified locations to detennine depths to seasonal high water table (SHWT), The following is a brief report of the methods utilized in this evaluation and the results obtained. Soil /Site Evaluation Methodoloev The site evaluation was perfbrmcd by advancing hand auger borings to sufficient depths to estimate seasonal high water table. S &EC navigated to the soil boring locations within the stone water device location with a GPS receiver to describe soil morphological conditions using standard techniques outlined in the "Field Book for Describing and Sampling Soils" published by the Natural Resources Conservation Service (NRCS, 2002), Soil/Site Conditions This site consists of very deep. poorly drained to very poorly drained soils of the Coastal Plain. Field investigation revealed that Soil Borings 1 -3. as referenced on the attached map, have seasonal high water table indications between 6" and 9" in depth from top of ground at the specified locations. Under current regulations, the bottom of any bioretention pond must be a minimum of two feet above the seasonal high water table. Current NC -DWR regulations also stipulate that an underdrain must be installed in a bioretention area it -soils underlying the structure have a drainage rate of less than 2 in /hr, S &EC made no attempt to measure soil saturated hydraulic Conductivity (Ksat) in the underlying soil at this time but, due to the underlying clay horizons, S &C?C believes that the hydraulic conductivity would be less than 2 in /hr. Soil & Environmental Consultants, PA is pleased to be of` service in this matter and we look forward to assisting in the successful completion of the project. if requested. S &EC can meet on -site with NC -DWR to discuss ()ur findings and recommendations. Please feel free to call with any questions or comments. Sincerely, Soil & Environmental Consultants, PA SOIL 9C, 0 A PO CJ �Q� � A ; �\„�FNORTH GP�� Ricky Pontello NC Licensed Soil Scientist f 1232 Page 2 of 2 t " t iiV�NN ;ttNtftN2iiiNih \ � ' 00110 1 0, '01,00N0NyNt4Lt5t�l' SOIL BORING 2 �. Q 1 SHWT 6" L � \ SOIL BORING 1 \� 17 SHWT 9" SOIL\B4ORING 3 = SHWT 9" € vi a •Q •i. I, � t', : i , � , \ /' . , Gam, `.,\ \/ l ' . LEGEND 'I GRAPHIC SCALE 9JL 70i YlG LOCA7 ON 30 0 30 60 +"" Irvpu Ne LLS� 5� EVERGREEN POD 10 90118 Bnvltoameatal Conaultaots, [_�OHN5TOM co-, NC r 5TocK5 i•.�o v 5TORMWATtR SOILS EVALUATION I of I Permit Number: (to be provided by DWQ) Drainage Area Number: Bioretention Operation and Maintenance Agreement I will keep a maintenance record on this BMP. This maintenance record will be kept in a log in a known set location. Any deficient BMP elements noted in the inspection will be corrected, repaired or replaced immediately. These deficiencies can affect the integrity of structures, safety of the public, and the removal efficiency of the BMP. Important operation and maintenance procedures: - Immediately after the bioretention cell is established, the plants will be watered twice weekly if needed until the plants become established (commonly six weeks). - Snow, mulch or any other material will NEVER be piled on the surface of the bioretention cell. - Heavy equipment will NEVER be driven over the bioretention cell. - Special care will be taken to prevent sediment from entering the bioretention cell. — Once a year, a soil test of the soil media will be conducted. After the bioretention cell is established, I will inspect it once a month and within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal County). Records of operation and maintenance will be kept in a known set location and will be available upon request. Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately. BMP element: The entire BMP The perimeter of the bioretention cell The inlet device: pipe, stone verge or swale Potential problems: Trash /debris is present. Areas of bare soil and /or erosive gullies have formed The pipe is clogged (if applicable). The pipe is cracked or otherwise damaged (if applicable). Erosion is occurring in the swale (if applicable). Stone verge is clogged or covered in sediment (if applicable). How I will remediate the problem: Remove the trash/ debris. Regrade the soil if necessary to remove the gully, and then plant a ground cover and water until it is established. Provide lime and a one -time fertilizer application. Unclog the pipe. Dispose of the sediment off -site. Replace the pipe. Regrade the swale if necessary to smooth it over and provide erosion control devices such as reinforced turf matting or riprap to avoid future problems with erosion. Remove sediment and clogged stone and replace with clean stone. Form SW401- Bioretention O &M -Rev.3 Page 1 of 4 BMP element: The pretreatment area The bioretention cell: vegetation The bioretention cell: soils and mulch Potential problems: Flow is bypassing pretreatment area and /or gullies have formed. Sediment has accumulated to a depth greater than three inches. Erosion has occurred Weeds are present. Best professional practices show that pruning is needed to maintain optimal plant health. PIants are dead, diseased or dying. Tree stakes /wires are present six months after planting. Mulch is breaking down or has floated away. Soils and /or mulch are clogged with sediment. An annual soil test shows that pH has dropped or heavy metals have accumulated in the soil media. How I will remediate the problem: Regrade if necessary to route all flow to the pretreatment area. Restabilize the area after grading. Search for the source of the sediment and remedy the problem if possible. Remove the sediment and restabilize the pretreatment area. Provide additional erosion protection such as reinforced turf matting or riprap if needed to prevent future erosion problems. Remove the weeds, preferably by hand. Prune according to best professional practices. Determine the source of the 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. Remove tree stake/ wires (which can kill the tree if not removed). Spot mulch if there are only random void areas. Replace whole mulch layer if necessary. Remove the remaining much and replace with triple shredded hard wood mulch at a maximum depth of three inches. Determine the extent of the clogging - remove and replace either just the top layers or the entire media as needed. Dispose of the spoil in an appropriate off -site location. Use triple shredded hard wood mulch at a maximum depth of three inches. Search for the source of the sediment and remedy the problem if possible. Dolomitic lime shall be applied as recommended per the soil test and toxic soils shall be removed, disposed of properly and replaced with new planting media. Form SW401- Bioretention O &M -Rev.3 Page 2 of 4 BMP element: The underdrain system (if applicable) The drop inlet The receiving water Potential problems: Clogging has occurred, Clogging has occurred. The drop inlet is damaged Erosion or other signs of damage have occurred at the outlet. How I will remediate the }problem: Wash out the underdrain system. Clean out the drop inlet. Dispose of the sediment off -site. Repair or replace the drop inlet. Contact the NC Division of Water Quality 401 Oversight Unit at 919- 733 -1786. Form SW401- Bioretention O &M -Rev.3 Page 3 of 4 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 tutme:Fl owers Plantation - Everereen Phase 1 (Pod NE -10) BMP drainage area number:NA Print name:Rebecca Flowers Title:Owner / Developer Address:4880 NC 42 East, Clavton, NC 27520 Phone: i -r_.�� - �� C 4 Signature: Date: �N��� r�( Ci r 'A 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, j Zyv —,5cl a Notary Public for the State of t: (` ►�� -�1 Cr,0 01 , County of �(�� r��, �y� , do hereby certify that �S�SCCC vt �G��.;E►`3 personally appeared before me this day of 'JU �� ,�P , and acknowledge the due execution of the l forgoing bioretention maintenance requirements. Witness my hand and official seal, Teresa O'Hara Notary Public Johnston Countyb C - My Commission Expires 1 ' SEAL My commission expires C� ! Z! Z) i f) Form SW401- Bioretention I &M -Rev. 2 Page 4 of 4 o, UUPI OI S =GP PN PNfN N� f(y fit! rop 11, " • ° 3 Fall 4, t31 t till, Is, I s 35! x ap 0 nonce SA s v'9M� �J ZZM N ?» ?O mmr c _ 0 i - N�� \\ i ®p� 4� �` Jaw Ilk 4QN x V [e � A � � : A A A i 0 8 a� 1a S - D 1y ID QQ gg aa QQ D • �txs y STOCKS ENGINEERING, P.A. FLOWERS p�/�/Tj�T /0/�/_A�ORT/YEASTQU•40 O 110 BOX 11 AVENUE PHONE: 2 45959 -81196 NASHNLLE, N.C. 2 656 ® MOBILE: (252) 903 689 MASrE� Lop G4roaT AUN ATE' '�� 2 1011 M z � 11 t1tE HM 2013-otN %VtT. SGLLI: WOW LQ9-A--7-7ON as as 6B US ' PM } Sam ry