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HomeMy WebLinkAbout20051978 Ver 2_Application_20070124E'nV Environmental Consulting Services Inc. 3764 Rominger Road Banner Elk, NC 28604 Ph/Fax: 828-297-6946 e-mail: john@env-ecs.com January 23, 2007 Mr. John Dorney NC DENR DWQ Wetlands/401 Unit 1621 Mail Service Center Raleigh, NC 27699-1621 PE~~,~~~E:uT RECEIVED RE: Shuford -Tate Blvd. PD-MU Development Hickory, North Carolina Dear Mr. Domey: Included under this cover are 6 copies of an application for impacts to an isolated wetland in Hickory, NC. A check in the amount of $200.00 is included to cover the permit fee. Impacts to the isolated wetland are 0.284 acres. Other impacts to non-isolated waters on the site are limited to 0.0937 acres of wetlands and 92 linear feet of stream impact. All stream impacts to perennial streams (52') are associated with utility line installation and are temporary in nature. There is 40' of fill impact in a small intermittent stream. If you have any questions regarding this request please call me at 828-297-6946, thank you. Sincerely, ..fc~~ - ~~ ~ ~~ Jo n C. Vilas President, E'nV Environmental Consulting Services Inc. Cc: Alan Johnson Hunt Shuford Roger Young Shad Walters Clay Neil E'nV file ~~ ~~ ~~ p1 ~~ ~ ~ do ~, PN ~,~~ J ~P,~~wa~.~' Office Use Only: Form Version March OS USACE Action ID No. DWQ No. V a. 0 5- i q ~ 8 (If any particular item is not applicable to this project, please enter "Not Applicable" or "N/A".) I. Processing Pr~YP~~~`NT Check all of the approval(s) requested for this project: R~CE~~E~ ^ Section 404 Permit ^ Riparian or Watershed Buffer Rules ^ Section 10 Permit ® Isolated Wetland Permit from DWQ ^ 401 Water Quality Certification ^ Express 401 Water Quality Certification 2. Nationwide, Regional or General Permit Number(s) Requested: NWP 39 3. If this notification is solely a courtesy copy because written approval for the 401 Certification is not required, check here: ^ 4. If payment into the North Carolina Ecosystem Enhancement Program (NCEEP) is proposed for mitigation of impacts, attach the acceptance letter from NCEEP, complete section VIII, and check here: ^ 5. If your project is located in any of North Carolina's twenty coastal counties (listed on page 4), and the project is within a North Carolina Division of Coastal Management Area of Environmental Concern (see the top of page 2 for further details), chec p _~~ IJ ~`f [~ II. Applicant Information IJ 99..~~ JAN 2 4 2007 Owner/Applicant Information ~~~ _ w~aT>:k c~t}Ni_ET1° Name: Shuford -Tate Boulevard PD-MU Developms~ sTytir~R awwc~ Mailing Address: PO Box 2228 Hickory, NC 28603 C H 51-u.~.~ ord. Telephone Number: Fax Number: 828-304-8387 E-mail Address: hshuford(a,shurtape.com 2. Agent/Consultant Information (A signed and dated copy of the Agent Authorization letter must be attached if the Agent has signatory authority for the owner/applicant.) Name: John Vilas Company Affiliation: E'nV Environmental Consulting Services Inc. Mailing Address: 3764 Romin~er Road Banner Elk NC 28604 Telephone Number: 828.297.6946 Fax Number: 828.297.6946 E-mail Address:_ iohn(a~env-ecs.com III. Project Information e Page 5 of 14 Attach a vicinity map clearly showing the location of the property with respect to local landmarks such as towns, rivers, and roads. Also provide a detailed site plan showing property boundaries and development plans in relation to surrounding properties. Both the vicinity map and site plan must include a scale and north arrow. The specific footprints of all buildings, impervious surfaces, or other facilities must be included. If possible, the maps and plans should include the appropriate USGS Topographic Quad Map and NRCS Soil Survey with the property boundaries outlined. Plan drawings, or other maps may be included at the applicant's discretion, so long as the property is clearly defined. For administrative and distribution purposes, the USACE requires information to be submitted on sheets no larger than 11 by 17-inch format; however, DWQ may accept paperwork of any size. DWQ prefers full-size construction drawings rather than a sequential sheet version of the full-size plans. If full-size plans are reduced to a small scale such that the final version is illegible, the applicant will be informed that the project has been placed on hold until decipherable maps are provided. 1. Name of prof ect: Shuford- Tate Boulevard PD-MU Development 2. T.I.P. Project Number or State Project Number (NCDOT Only): 3. Property Identification Number (Tax PIN): 372205079859, 372205177761, 372209271170, 372205083992 4. Location County: Catawba Nearest Town: Hickory Subdivision name :Shuford- Tate Boulevard PD-MU Development Directions to site (include road numbers/names, landmarks, etc.: From 321 South take a left Turn right onto Lenoir-Rhyne Blvd SE. From there take a left onto Tate Blvd SE. The site is approximately 2 miles on your left. 5. Site coordinates (For linear projects, such as a road or utility line, attach a sheet that separately lists the coordinates for each crossing of a distinct waterbody.) Decimal Degrees (6 digits minimum): 35° 43' 46.7041 °N 81° 17' 7.0440 °W 6. Property size (acres): 7. Name of nearest receiving body of water: Miller Branch (class C~ and three tributaries UT-1, UT-2, and UT-3 8. River Basin: Catawba River Basin (Note -this must be one of North Carolina's seventeen designated major river basins. The River Basin map is available at http://h2o.enr.state.nc.us/admul/maps/.) 9. Describe the existing conditions on the site and general land use in the vicinity of the project at the time of this application: The project area and surrounding land is proposed to be zoned planned development -mixed use (PD-MU) but is currently zoned light industrial (I-2~ by Page 6 of 14 the City of Hickory, and the adjacent property to the east is already developed and being as such. The project area has mostly been undeveloped except for two pockets (of three or four acres each) of rading which occurred approximatel~y_ ergo. Prior to this disturbance this property was used as a subsistence farm. Miller Branch (index # 11-129-5-1; class C) is the one named stream as shown on the Hickory, NC USGS topographic quadrangle. This stream flows north to south through the site. Three unnamed tributaries to Miller Branch also originate on the property. UT-1 originates east of Miller Branch. These two streams make confluence in the southwest corner of the property. UT-2 also on ig Hates on site out of wetland unit W2 on the western portion of the property and makes confluence with Miller Branch offsite. The Hickory, NC USGS topographic quadrangle shows that a pond existed on the northern boundary of the property approximately ten ergo, after the dirt dam was breeched, the pond drained. This old pond basin is currently a .219-acre wetland s,, s~~Wl) and is the head of Miller Branch. Groundwater seepage and a perched water table allow W 1 to stay mostly saturated with inundation in lower lying areas. W2 is the head of an intermittent tributary of Miller Branch and is a riparian wetland approximately 0.022 acres in size. The h dy rology for this system is controlled by direct surface runoff and emerging ground water. Lame rain events (causing erosion of surroundin areas) have deposited non-hydric soils (8" deep) on the surface of W2. The last wetland on this site (W3) is an isolated wetland, 0.315 acres in size. This unit has been affected by offsite disturbances. W3 has mostly soils with high clay content causing_pooling to occur with large rain events. This has caused the growth of hydric vegetation. Wetland unit W3 is located in an open field below a natural cove. The three wetlands collectively total 0.558 acres. The elevation of the site ranges from 960' above sea level, along the southern boundary of the property, to 1,087' above sea level on the northern property boundary. The majority of the site has anOak- Hickory forest community including: Northern Red Oak, White Oak, Chestnut Oak, Dogwood, Red Maple, etc. 10. Describe the overall project in detail, including the type of equipment to be used: The 75.065-acre Shuford Development includes a public access road (road is proposed at 1,967.66 feet in length and 25' in width) connecting Performance Drive S.E. with McDonald Parkway and following the northern most property boundary. Once built this road will be used to access eleven lots that are proposed to be zoned PD-MU. These lots range in size from approximately three acres to eleven acres. Standard construction equipment (track hoe, bulldozers, and large trucks) will be used on site to excavate and grade the new road. The appropriate soil erosion and sediment controls will be used and maintained during construction. 11. Explain the purpose of the proposed work: The purpose of this project is to build a public access road that connects Performance Drive S.E. with McDonald Parkway. This road will then be used to access lots that are to be zoned PD-MU. The impacts to the wetlands are associated with the construction of the access road and caused by rg ading and fill. The impacts to Miller Branch will be from accessing and installing utilities. Page 7 of 14 IV. Prior Project History If jurisdictional determinations and/or permits have been requested and/or obtained for this project (including all prior phases of the same subdivision) in the past, please explain. Include the USACE Action ID Number, DWQ Project Number, application date, and date permits and certifications were issued or withdrawn. Provide photocopies of previously issued permits, certifications or other useful information. Describe previously approved wetland, stream and buffer impacts, along with associated mitigation (where applicable). If this is a NCDOT project, list and describe permits issued for prior segments of the same T.I.P. project, along with construction schedules. There have been no previous jurisdictional determinations requested or obtained for this project. V. Future Project Plans Are any future permit requests anticipated for this project? If so, describe the anticipated work, and provide justification for the exclusion of this work from the current application. The eleven individual lots within the project area will be developed into mixed use facilities. These facilities will be responsible for their own onsite stormwater detention areas. The lots have been strate ig, call placed to minimize impacts to the waterways and the majority of lots will have no impacts. Miller Branch serves as a lot boundary with a 15' setback on both sides of the stream. UT-1 also serves as a lot boundary with the same setback until it reaches lot 5. Lots 7 and 8 have wetlands within their boundaries and UT-1 flows through the middle of lot 5. This work has been excluded from the current application because no building_plans have been submitted at this time. VI. Proposed Impacts to Waters of the United States/Waters of the State It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to wetlands, open water, and stream channels associated with the project. Each impact must be listed separately in the tables below (e.g., culvert installation should be listed separately from riprap dissipater pads). Be sure to indicate if an impact is temporary. All proposed impacts, permanent and temporary, must be listed, and must be labeled and clearly identifiable on an accompanying site plan. All wetlands and waters, and all streams (intermittent and perennial) should be shown on a delineation map, whether or not impacts are proposed to these systems. Wetland and stream evaluation and delineation forms should be included as appropriate. Photographs may be included at the applicant's discretion. If this proposed impact is strictly for wetland or stream mitigation, list and describe the impact in Section VIII below. If additional space is needed for listing or description, please attach a separate sheet. 1. Provide a written description of the proposed impacts: Proposed rg ading and fill will impact three wetlands on the property. There will be 0.0715 acres of impact to W 1 (see site map) and 0.022 acres of impact to W2. These wetland impacts include the use of clean fill material into the wetlands to raise road grade. Fill material into wetlands will extend only to the width necessary for road construction. There will be two temporary impacts on Miller Branch caused by stream crossi~s to install and access utility lines. These two temporary Page 8 of 14 disturbances will be returned to their natural state after installation is complete. There will also be four permanent impacts on Miller Branch; rip-rap will be installed after the stream has been disturbed from the installation of the sewer line crossing to stabilize the banks. This r~-rap will be range from 8" to 12" and will be placed on top of filter fabric, see drawing 1. UT-2 will also be impacted by fill from the proposed building and parkin plans of lot 8. 2. Individually list wetland impacts. Types of impacts include, but are not limited to mechanized clearing, grading, fill, excavation, flooding, ditching/drainage, etc. For dams, separately list impacts due to both structure and flooding. Wetland Impact Site Number (indicate on map) Type of Impact Type of Wetland (e.g., forested, marsh, herbaceous, bog, etc.) Located within 100-year Floodplain (es/no) Distance to Nearest Stream (linear feet) Area of Impact (acres) 1 Fill Forested (W1) No Adjacent .0715 2 Fill Riparian Wetland (W2) No Adjacent .022 3 Grading, Fill Isolated (W3) No 875' 0.284 Total Wetland Impact (acres) .3775 3. List the total acreage (estimated) of all existing wetlands on the property: 0.558 acres 4. Individually list all intermittent and perennial stream impacts. Be sure to identify temporary impacts. Stream impacts include, but are not limited to placement of fill or culverts, dam construction, flooding, relocation, stabilization activities (e.g., cement walls, rip-rap, crib walls, gabions, etc.), excavation, ditching/straightening, etc. If stream relocation is proposed, plans and profiles showing the linear footprint for both the original and relocated streams must be included. To calculate acreage, multiply length X width, then divide by 43,560. Stream Impact Number (indicate on ma) Stream Name Type of Impact Perennial or Intermittent? Average Stream Width Before Im act Impact Length (linear feet) Area of Impact (acres) 1 (offsite) Miller Branch Rip-rap Perennial 8' 8' .001 2 (offsite) Miller Branch Rip-rap Perennial 8' 8' .001 3 (offsite) Miller Branch Temp. Crossing # 1 Perennial 8' 10' .002 4 (offsite) Miller Branch Temp. Crossing #2 Perennial 8' 10' .002 5 UT-2 Fill Intermittent 3' 40' .003 6 (offsite) Miller Branch Rip-rap Perennial 8' 8' .001 7 Miller Branch Rip-rap Perennial 3' 8' .001 Total Stream Impact (by length and acreage) 92' .011 5. Individually list all open water impacts (including lakes, ponds, estuaries, sounds, Atlantic Ocean and any other water of the U.S.). Open water impacts include, but are not limited to exca etc. ~Onen Water Impact ~ Name of Waterbodv ~ Type of Impact ~ Type of Waterbodv ~ Area of ~ Page 9 of 14 Site Number (indicate on ma) (if applicable) (lake, pond, estuary, sound, bay, ocean, etc.) Impact (acres) Total Open Water Impact (acres) 0 6. List the cumulative impact to all Waters of the U.S. resulting from the protect: Stream Impact (acres): 0.011 Wetland Impact (acres): 0.3775 Open Water Impact (acres): 0.000 Total Impact to Waters of the U.S. (acres) 0.3885 Total Stream Impact (linear feet): 92' 7. Isolated Waters Do any isolated waters exist on the property? ®Yes ^ No Describe all impacts to isolated waters, and include the type of water (wetland or stream) and the size of the proposed impact (acres or linear feet). Please note that this section only applies to waters that have specifically been determined to be isolated by the USACE: _ The proposed impact to the isolated wetland will be caused by rg_ ailing and fill for road construction. The construction will impact 0.284 acres of the isolated wetland. Wetland vegetation exists. There are significant disturbances around this wetland from the adjacent property. This wetland is an old sediment basin created from previous construction on the adjacentproperty, and in heavy rain events still functions as such, but has become a naturalized wetland. There is an existing_pipe located under the wetland; it was installed ~~roximately 30 emirs ago. The pipe has leakYjoints or has otherwise failed in several areas resulting in sinkholes which are approximately 20'-30' deep and clearly visible in the open field. These holes and the potential for more to open represent a significant danger that must be addressed as soon as possible. The contractor is aware of this situation and has plans to repair the wipe back to its original working condition. When the pipe is fixed it is likely that the hydrology will be removed from the wetland, and these repairs would cause substantial disturbance to the wetland. This wetland is not only isolated but incidental. It was created because of a failed structure (pipe) that must be repaired to address a potentially dan Brous situation. 8. Pond Creation If construction of a pond is proposed, associated wetland and stream impacts should be included above in the wetland and stream impact sections. Also, the proposed pond should be described here and illustrated on any maps included with this application. Pond to be created in (check all that apply): ^ uplands ^ stream ^ wetlands Describe the method of construction (e.g., dam/embankment, excavation, installation of draw-down valve or spillway, etc.): Proposed use or purpose of pond (e.g., livestock watering, irrigation, aesthetic, trout pond, local stormwater requirement, etc.): Current land use in the vicinity of the pond: Page 10 of 14 Size of watershed draining to pond: Expected pond surface area: VII. Impact Justification (Avoidance and Minimization) Specifically describe measures taken to avoid the proposed impacts. It may be useful to provide information related to site constraints such as topography, building ordinances, accessibility, and financial viability of the project. The applicant may attach drawings of alternative, lower-impact site layouts, and explain why these design options were not feasible. Also discuss how impacts were minimized once the desired site plan was developed. If applicable, discuss construction techniques to be followed during construction to reduce impacts. Impacts within this property are associated with the construction of the public access road and installation of the sewer and utility lines. The lot lines were drawn along the stream corridors to minimize impacts. The best site for the road was determined based on the nature of the topography the property boundary, and the existing roads around the site. The proposed road will tie into an existing, intersection on McDonald Parkway, this needed to be as far from the Tate intersection as possible to minimize traffic congestion. Therefore, the proposed road comes out on McDonald Parkway at the northern most boundary of the property. The impacts to W 1 were unavoidable due to this concern. The road will follow a rid eg that spans the len h of the property allowing for minimal impacts to streams and maximum land use. The tie in on Performance drive also needed to be maximum distance from Tate Blvd. and close to the fiberline site boundary. See Avoidance and Minimization Map for visual representation of boundary lines. VIII. Mitigation DWQ - In accordance with 15A NCAC 2H .0500, mitigation may be required by the NC Division of Water Quality for projects involving greater than or equal to one acre of impacts to freshwater wetlands or greater than or equal to 150 linear feet of total impacts to perennial streams. USACE - In accordance with the Final Notice of Issuance and Modification of Nationwide Permits, published in the Federal Register on January 15, 2002, mitigation will be required when necessary to ensure that adverse effects to the aquatic environment are minimal. Factors including size and type of proposed impact and function and relative value of the impacted aquatic resource will be considered in determining acceptability of appropriate and practicable mitigation as proposed. Examples of mitigation that may be appropriate and practicable include, but are not limited to: reducing the size of the project; establishing and maintaining wetland and/or upland vegetated buffers to protect open waters such as streams; and replacing losses of aquatic resource functions and values by creating, restoring, enhancing, or preserving similar functions and values, preferable in the same watershed. If mitigation is required for this project, a copy of the mitigation plan must be attached in order for USACE or DWQ to consider the application complete for processing. Any application lacking a required mitigation plan or NCEEP concurrence shall be placed on hold as incomplete. Page 11 of 14 An applicant may also choose to review the current guidelines for stream restoration in DWQ's Draft Technical Guide for Stream Work in North Carolina, available at http://h2o.enr.state.nc.us/ncwetlands/strmgide.html. 1. Provide a brief description of the proposed mitigation plan. The description should provide as much information as possible, including, but not limited to: site location (attach directions and/or map, if offsite), affected stream and river basin, type and amount (acreage/linear feet) of mitigation proposed (restoration, enhancement, creation, or preservation), a plan view, preservation mechanism (e.g., deed restrictions, conservation easement, etc.), and a description of the current site conditions and proposed method of construction. Please attach a separate sheet if more space is needed. No mitigation is proposed at this time. 2. Mitigation may also be made by payment into the North Carolina Ecosystem Enhancement Program (NCEEP). Please note it is the applicant's responsibility to contact the NCEEP at (919) 715-0476 to determine availability, and written approval from the NCEEP indicating that they are will to accept payment for the mitigation must be attached to this form. For additional information regarding the application process for the NCEEP, check the NCEEP website at htt~://h2o.encstate.nc.us/wrp/index.htm. If use of the NCEEP is proposed, please check the appropriate box on page five and provide the following information: Amount of stream mitigation requested (linear feet): 0 Amount of buffer mitigation requested (square feet): 0 Amount of Riparian wetland mitigation requested (acres): 0 Amount ofNon-riparian wetland mitigation requested (acres): 0 Amount of Coastal wetland mitigation requested (acres): 0 IX. Environmental Documentation (required by DWQ) 1. Does the project involve an expenditure of public (federal/state/local) funds or the use of public (federal/state) land? Yes ® No ^ 2. If yes, does the project require preparation of an environmental document pursuant to the requirements of the National or North Carolina Environmental Policy Act (NEPA/SEPA)? Note: If you are not sure whether a NEPA/SEPA document is required, call the SEPA coordinator at (919) 733-5083 to review current thresholds for environmental documentation. Yes ^ No 3. If yes, has the document review been finalized by the State Clearinghouse? If so, please attach a copy of the NEPA or SEPA final approval letter. Yes ^ No ^ X. Proposed Impacts on Riparian and Watershed Buffers (required by DWQ) It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to required state and local buffers associated with the project. The applicant must also provide Page 12 of 14 justification for these impacts in Section VII above. All proposed impacts must be listed herein, and must be clearly identifiable on the accompanying site plan. All buffers must be shown on a map, whether or not impacts are proposed to the buffers. Correspondence from the DWQ Regional Office may be included as appropriate. Photographs may also be included at the applicant's discretion. Will the project impact protected riparian buffers identified within 15A NCAC 2B .0233 (Meuse), 15A NCAC 2B .0259 (Tar-Pamlico), 15A NCAC 02B .0243 (Catawba) 15A NCAC 2B .0250 (Randleman Rules and Water Supply Buffer Requirements), or other (please identify )? Yes ^ No 2. If "yes", identify the square feet and acreage of impact to each zone of the riparian buffers. If buffer mitigation is required calculate the required amount of mitigation by applying the buffer multi Tiers. * Impact Required Zone ,_______ r ~~ Multiplier ,~,~;+;~~~;~~ 3 (2 for Catawba) 1.5 Total * Zone 1 extends out 30 feet perpendicular from the top of the near bank of channel; Zone 2 extends an additiona120 feet from the edge of Zone 1. 3. If buffer mitigation is required, please discuss what type of mitigation is proposed (i.e., Donation of Property, Riparian Buffer Restoration /Enhancement, or Payment into the Riparian Buffer Restoration Fund). Please attach all appropriate information as identified within 15A NCAC 2B .0242 or .0244, or .0260. XI. Stormwater (required by DWQ) Describe impervious acreage (existing and proposed) versus total acreage on the site. Discuss stormwater controls proposed in order to protect surface waters and wetlands downstream from the property. If percent impervious surface exceeds 20%, please provide calculations demonstrating total proposed impervious level. There are currentlX no impervious surfaces in the project area. See the attached stormwater mana e~ mentplan for calculations and details of the proposed BMP's. In the Stormwater plan each lot is listed separately to give the acreage of impervious surface within each lot boundary. Stormwater will be treated from two offsite locations NE of the property on adiacent lots. This stormwater from this site and two offsite locations will be treated with four Stormwater wetlands (with 85% removal of TSS) and two drX detention basins. These BMP's will meet the specifications as laid out in the "Stormwater Best Management Practices" compiled by DWQ and DENR (1999). These specifications are shown on the stormwater wetland typical design and the profile of the constructed wetland and dry detention basin. The total impervious post-development is 40.61%, with 30.7 acres of impervious development~roposed The proposed SWM flan calls for a total of 34.03 impervious acres to be treated with best mana event practices in order to meet the state requirements. XII. Sewage Disposal (required by DWQ) Page 13 of 14 ' v. V V G ' L Clearly detail the ultimate treatment methods and disposition (non-discharge or discharge) of wastewater generated &ona the proposed project, or available capacity of the subject facility. This~roiect area will have its sewer lines tied in with the city of H' ko w ste~vater trey cut lent. XIIL Violations (required by AWQ) Is this site in violation of DWQ VJctland Rules (l~A NCAC 2I~ .0500) ar any Buffer Rules? Yes ^ No Is this an aftez-the-fact permit application? Yes (~ No ^ • Some impact has occurred im the isolated wetland_ X>[V. Cumul$tive Impacts (required by DWQ) Will this project (based on past and reasonably anticipated future impacts) result in additional development, which could impact nearby downstream water quality? Yes ^ Na If yes, please submit a qualitative or quantitative currtulative impact analysis in accordance with the most recent North Carolina Division of Water Quality policy posted on our website at http•/~'h~o.enr.state.nc.us!n~~vetlands. Yf no, please provide a short narrative description: After the dev Iovment of this multi-use area these aze no plans for future development. _ __ XV. Utlter Circumstances (Optional): It is the applicant's responsibility to submit the application sufficiently in advance of desired coAStzuetion dates to allow processing time for these permits. However, azt applicant may choose to fist constraints associated with constructYOn or sequencing that may impose limits on work schedules (e.~_, draw-down schedules for lakes, dates associated with Endangered and Threatened Species, accessibility, problems„ or other issues outside of the applicant's control). The auvlicant eau~sts oermissior< to vroceed immediately with repairs to exisrins failed pine system t 's work will require some impacts to•the isolated wetland. This work is requested to prevent additi nal sink holes from opening up. Such an occurrence could not only result excessive sedimentation entcrine Haller Branch but. in the worst case. could resui in damage to Tate lvd. ten 'all crew ' lie safe oncern. :.~.~ pli t/Agent's Signature D to (Agent's si c is valid only if an authorization letter from the applicant is provided.) t •d s~ss~szeae Page 14 of I4 ep2~0i LO EZ O ~--+ L ~ U ~ ~ ~. ~ ~- p p (a ~ Z~ _~ ~ ~~ ~ _ ~ ~ U o _ j> ~ ~ '^ ~--+ U 0 0 S a a c C _~ C Q C •F Z Q i U O Z ~~~ ~ ~ _~~ _ ~ ~~ ~~ (C~~~ L~=,F •~ a ~ :~ ,. ~ ~:J S ~~ y f.»t -' i ,u -y } O N 0 0 y ~ 0 c 0 U O N ~X O L Q I~ Q ~. O Z Shuford Development Catawba County, North Carolina Topographic Map ~~~~ ~~,, ~ _ '+,,. l ~ ~ . `"`~`..~., Not Scaled Hickory, NC USGS Topographic Quadrangle Shuford Development Catawba County, North Carolina Soils Map i ~ ~ f ~ ~~~_ ~, ~~ r r ~ ~ ~ .. ,_~ _ ~...~ -~ ..,, ~ _ ,, ..~ ~~ A. _~ ~..r __ = -~. Not Scaled CnE3: Cecil clay loam, 10-25% CmD2: Cecil sandy loam, 10-25% HsB2: Hiwassee loam, 2-6% HwB2: Hiwassee clay loam, 2-6% HwC2: Hiwassee clay loam, 6-10% PeE: Pacolet soils, 10-25% Nortn Tate Blvd. PD-MU Shuford Development Catawba County, North Carolina Site Plan xo~m~ ~, ~; ~; ~ I---~ 1jS ~~ IA' ;1 Q 'C, , , Z z lO~vvol? , ` P 0,1j4 1 Y 1 ~. ~p~ ~r.~~ ~~,2 l ?~B6 L?m~ ~C D~ o~ ~ \ ~"'.'~7 1~ r ~~~~,, ;~ ~ ~ _, ~~~_~ __~ -,, 1 ,~I ~, UT-1 W1: Forested Wetland (0.219 acres) W2: Riparian Wetland (0.022 acres) W3: Isolated Wetland (0.315 acres) UT-1: Unnamed Intermittent Tributary UT-2: Unnamed Intermittent Tributary UT-3: Unnamed Intermittent Tributary Miller Branch: Perennial Stream ~~ ~ ~~~c ~~ ~ \~ ` ' ~ ~ r ,~ 9 i ~ - ~ , J ; ~~~, ~~~ ~~~~ I ~,g,~ i J a,4 llf/j . , - ~ ~~ ~_ \\~ _~\ ..--i ~~ ~~ ~~ \\~~ ~~ /' ~~~~ j \\~~ \~\ ~. w ~~~~V'~a ~"*T t _ \~ I Not Scaled r---- ,` Lot 9 ~~ Lot 8 II II, Shuford Development Catawba County, North Carolina Impact Minimization and Avoidance ., - \\`~ \~~~ Lot 7 ~, •~ . ~, ~...~ ~ ~ ~; n __. ~, ~_ Lot 11 Lot 6 ~ . '\\~._~_ i~ ~. ~ t r Lot 2 ~'. Lot 1 ~. ~~ Not Scaled ~~ Lot division designed to follow streams and minimize impacts ~ ~- Shuford Develo ment ~~`~'~~~~~~ ~~! p ~, Catawba County, North Carolina JAN 2 ~ c~~l Wetland Impact 1 and Miller Branch ImpacDENR-WATERQUALlTY LAPlDS ANp ST()Ft~iM(ATER BRAI~H ~i ~ Si ~~i ~- ~~ i iti r 1 ( ~~~~ 1~ ~ i i ~ ti il' -Jf- JJf i i , ,~ i1 ,. ~ ~~ ki~ i ` ` i4 1 `~ ~ ~ 111 ii o a~ .~ /` ~ ~" ~~ ~ ~,~ .,~ / ~ .', ~~i~ ~ rf ~ ~~ ~ ~ / .. ~ ~ C s, f ,:., ,% ~ ,~' J d ,; ~' ~ .~ ... ~ ~ ~~ _ ~. ~- ,~ ~ __ ~~ ~ ~ ~~ Wetland Impact 1 ~~ ry .... ~r+~` .a~ .id` . f.,,~ _,; Stream Impacts 7 :; ....,~ ~,'' Not Scaled Shuford Development Catawba County, North Carolina Wetland Impact 2 and Stream Impact 5 _ __ . ~3 ~_ Not Scaled C a~ a~ D (6 C p M L ,~,.,~ (6 U U ~ ~ ~ Z ~ ~~ ~ N O U~ .~ ~ c~ .~, - c~ U ~~~~~ ~D JA,N ,~ ~ 2007 ~tN}' ~t`,,~T IU~~ST k~'~~Ri'rY Shuford Development Catawba County, North Carolina Offsite Impacts Not Scaled O -}-+ N ~ ~ }' U C!) ~ CV N ~ U_Om Q (~ N ~ ~ ~ L ,~ p U Q ~--~ .~ _~ U .Q ~>+ 0 M ~ w .~:~ o ~ f , f Y- 1 ~ ~ (6 `~ c; O ~ ti~ ~ \t ~ N r \\ M _~ ~~ ~' ~ c ~ c~ m~ I ~ I ~ (n L ~ 4~ ° a~ N ~ i ~ .~ ~ , ` ~ U RS ~ . L iA`",1\ ( ~'¢ ` ~ ~ '/ ` ~~ ~~ o o c ,k~ , a a~ ~ c~ ~ a~ U ~ f6 ~ ` Q Q= ' U ~ _ .~ ~ ~ _ L ~ ^` ~2_ VJ ~2_ C •J ~ ^ •! ~ V' ~ Q ~ Q _ ~..L N vJ LL cu U O Z Stream Impact 1 Typical Detail of Riprap Slope Stabilization Impacts to Miller Branch 50' Riprap will impact approximately 25 linear feet of stream Stone size will range from 8-12 inches in diameter Riprap will be placed on top of filter fabric Not scaled ~ DS -1~~8 Tate Boulevard PD-MU Stormwater Management Plan Shuford Development Hickory, North Carolina Stormwater Management Plan: Pre-development (50%TSS removal) there were no existing impervious surfaces on site. Based on the proposed development plans the following table shows the calculations for impervious surfaces and TSS removal for each lot within the property boundary as well as the two sites to be treated outside of the property boundary. This requirement will be met through the installation of four stormwater wetlands (85%TSS removal) and two dry detention basins (50%TSS removal). The developed site will have a total impervious cover of 40.6% or 30.73 acres. The proposed stormwater management plan meets the state requirements by treating a total of 34.03 acres of impervious cover (29.6 acres on- site and 4.43 acres off-site). The off-site impervious acres are located on industrial sites adjacent to and northeast of the project site. The 85% removal requirement will be met by treating 26.21 impervious acres with four constructed stormwater wetland basins (85% removal efficiency) and treating the remaining 7.82 acres with two extended dry detention basins (50% removal efficiency). Shuford Industrial Site Stormwater Management Plan Spreedsheet Showing Compliance with 85% TSS Removal Requirement Removal Units TSS Location Area Imperv (ac) Imperv % BMP Type Efficiency Removed lot 1 4.05 2.04 50.37 wetland 0.85 1.734 lot 2 4.04 2.039 50.47 wetland 0.85 1.73315 lot 3 4.77 2.7 56.60 wetland 0.85 2.295 lot 4 4.58 2.57 56.11 wetland 0.85 2.1845 lot 5 10.88 2.9 26.65 wetland 0.85 2.465 lot 6 10.87 4.47 41.12 dry basin 0.5 2.235 lot 7 2.9 1.33 45.86 wetland 0.85 1.1305 lot 8 7.55 3.35 44.37 dry basin 0.5 1.675 lot 9 1.55 0 0.00 none 0 0 lot 10 7.44 3.08 41.40 wetland 0.85 2.618 lot 11 9.95 5.12 51.46 wetland 0.85 4.352 Road 2.3 1.129 49.09 0.95965 0 0 open 4.77 0 0.00 0 0 0 total site 75.65 30.728 40.62 0 0 off lot 1 5 2 wetland 0.85 1.7 off lot 2 8.01 2.43 wetland 0.85 2.0655 Removal Requirement: 30.728 impervious acres * 85%TSS removal = 26.12 units Removal Efficiency Proposed: 26.21 impervious acres * 85% = 22.28 units 7.82 impervious acres * 50% = 3.91 units Total Removal = 26.19 units Wetland Detention Basin Specifications: The calculations for each basin are provided in the below tables. The wetlands are all based on the specified guidelines presented in the "Stormwater Best Management Practices" manual compiled by NCDENR Division of Water Quality (1999). The basin is designed to have a 3:1 length to width ratio as well as a 3:1 side slope ratio. See the Stormwater Wetland Profile for details. The pools will be cleaned of sediment when the sediments have reached 25% of permanent pool depth. This will be specified more in the O&M Plan. The temporary water quality pool has been sized to release the runoff from a 1"precipitation event. According to the calculations the temporary pool will be able to draw down in 2-5 days. Access and an emergency drain have been provided for upkeep and maintenance of the stormwater wetland. See DWQ's Wet Detention Basin Worksheet for checklist of required items. Stormwater Wetland 1: Lots 10,11, portion of off-site1, and portion of off-site 2 drainage area to wetland (on-site) (off-site) impervious area (on-site) (off-site) impervious use permanent pool depth = 3 feet SA/DA percent = 1.73 surface area of permanent pool: 17.39 ac 6.6 ac 8.2 ac. 1.45 ac 40% 0173 = SA/23.96 = 0.42 acres Required Temporary Storage Volume Rv = 0.05+.009 (40) = 0.41 in/in volume = 1" * 0.41 * 24 acres/12 = 0.82 ac-ft = 35720 cu-ft add 20% additional volume for sediment storage = 42,863 cu-ft Design Specifications: Forebay Zone 1 (0"-9" Water Depth) Zone 2 (9"-18" Water Depth) Zone 3 (0"-18" Above Water) Zone 4 (18"-36" Above Water) Total 18% 3600 sq-ft 35% 7000 sq-ft 35% 7000 sq-ft 10% 2000 Sq-ft 2% 400 Sq-ft 100% 20000 sq-ft Dimensions of Permanent Pool: 80' by 250' Below are the calculations for the orifice sizing for Stormwater Wetland 1: Compute release rate for temporary storage volume over 2 to 5 days and orifice size WQ volume = 0.82 ac-ft Q2 = 0.82"`43560/48''3600 = 0.21 cfs Q5 = 0.82*43560/120*3600 = .083 cfs Average head = 1.0 ft. Orifice Eq. Q = CA(2gh)^0.5 for Q2:.21 = .6"A ((2 (32.2)(1))"0.5 A = .036 Sq-ft dia. = 2.6" for Q5:.083 = .6"A ((2 (32.2)(1))^0.5 A = .014 Sq-ft dia. = 1.6" use 2" pipe with negative slope and trash guard Stormwater Wetland 2: Lots 1,2,3,4, portion of off-site 1, and portion of off-site 2 drainage area to wetland (on-site) (off-site) total impervious area (on-site) (off-site) total impervious use permanent pool depth = 3 feet SA/DA percent = 2.13 surface area of permanent pool: 17.44 ac. 6.41 ac. 23.85 ac. 9.35 ac. 2.98 ac. 12.33 ac. 52% 2.13% 0213 = SA/23.85 = 0.51 acres Required Temporary Storage Volume Rv = 0.05+.009 (52) = 0.52 in/in volume = 1" * 0.52 * 24 acres/12 = 1.04 ac-ft = 45302 cu-ft add 20% additional volume for sediment storage = 54,363 cu-ft Design Specifications: Forebay 18% 4320 sq-ft Zone 1 (0"-9" Water Depth) 35% 8400 sq-ft Zone 2 (9"-18" Water Depth) 35% 8400 sq-ft Zone 3 (0"-18" Above Water) 10% 2400 sq-ft Zone 4 (18"-36" Above Water) 2% 480 sq-ft Total 100% 24000 sq-ft Dimensions of Permanent Pool: 80' by 300' Below are the calculations for the orifice sizing for Stormwater Wetland 2: Compute release rate for temporary storage volume over 2 to 5 days and orifice size WQ volume = 1.04 ac-ft Q2 = 1.04*43560/48*3600 = 0.262 cfs Q5 = 1.04"43560/120"3600 = .105 cfs Average head = 1.2 ft. Orifice Eq. Q = CA(2gh)^0.5 for Q2:.262 = .6*A ((2 (32.2)(1.2))^0.5 A = .05 Sq-ft dia. = 3" for Q5:.105 = .6'A ((2 (32.2)(1.2))^0.5 A = .02 Sq-ft dia. = 1.9" use 2.5" pipe with negative slope and trash guard Stormwater Wetland 3: Lot 5 drainage area to wetland (on-site) 5.49 ac. (off-site) 0 ac. total 5.49 ac. impervious area (on-site) 2.9 ac. (off-site) 0 ac. total 2.9 ac. impervious % 53% use permanent pool depth = 3 feet SA/DA percent = 2.47 2.47% surface area of permanent pool: .0247 = SA/5.49 = 0.136 acres Required Temporary Storage Volume Rv = 0.05+.009 (53) = 0.53 in/in volume = 1" " 0.53 " 5.49 acres/12 = 0.243 ac-ft = 10,562 cu-ft add 20% additional volume for sediment storage = 12,675 cu-ft Design Specifications: Forebay Zone 1 (0"-9" Water Depth) Zone 2 (9"-18" Water Depth) Zone 3 (0"-18" Above Water) Zone 4 (18"-36" Above Water) Total Dimensions of Permanent Pool: 40' by 150' 18% 1080 sq-ft 35% 2100 sq-ft 35% 2100 sq-ft 10% 600 sq-ft 2% 120 Sq-ft 100% 6000 sq-ft Below are the calculations for the orifice sizing for Stormwater Wetland 3: Compute release rate for temporary storage volume over 2 to 5 days and orifice size WQ volume = 0.243 ac-ft Q2 = 0.243''43560/48*3600 = 0.06 cfs Q5 = 0.243*43560/120*3600 = .025 cfs Average head = 0.85 ft. Orifice Eq. Q = CA(2gh)^0.5 for Q2:.06 = .6*A ((2 (32.2)(.85))^0.5 A = .014 Sq-ft dia. = 1.6" for Q5:.004 = .6*A ((2 (32.2)(.85))"0.5 A = .006 Sq-ft dia. = 1" use 1.5" pipe with negative slope and trash guard Stormwater Wetland 4: Lot 7 drainage area to wetland (on-site) (off-site) total impervious area (on-site) (off-site) total impervious use permanent pool depth = 3 feet SA/DA percent =1.46 surface area of permanent pool: 4.08 ac. 0 ac. 4.08 ac. 1.33 ac. 0 ac. 1.33 ac. 33% 1.46% 0146 = SA/4.08 = 0.06 acres Required Temporary Storage Volume Rv = 0.05+.009 (33) = 0.35 in/in volume = 1" " 0.35 * 4.08 acres/12 = 0.12 ac-ft = 5200.0 cu-ft add 20% additional volume for sediment storage = 6220 cu-ft Design Specifications: Forebay 18% 504 sq-ft Zone 1 (0"-9" Water Depth) 35% 980 sq-ft Zone 2 (9"-18" Water Depth) 35% 980 sq-ft Zone 3 (0"-18" Above Water) 10% 280 sq-ft Zone 4 (18"-36" Above Water) 2% 56 sq-ft Total 100% 2800. sq-ft Dimensions of Permanent Pool:28' by 100' Below are the calculations for the orifice sizing for Stormwater Wetland 4: Compute release rate for temporary storage volume over 2 to 5 days and orifice size WQ volume = 0..012 ac-ft Q2 = 0.12*43560/48''3600 = 0.03 cfs Q5 = 0.12*43560/120"3600 = .012 cfs Average head = 0.85 ft. Orifice Eq. Q = CA(2gh)^0.5 for Q2:.03 = .6*A ((2 (32.2)(.85))^0.5 A = .007 Sq-ft dia. = 1.1" for Q5:.012 = .6*A ((2 (32.2)(.85))^0.5 A = .003 Sq-ft dia. = 0.7" use 1.0" pipe with negative slope and trash guard Profile of Constructed Wetland Riser Prevents Overflowing Embankment with Marsh Plants Embankment Top of Compacted and Spillway Earthen Embankment To be covered in filter cloth Emergency First 1" Storm Storage And riprap for stabilization • ~illway ------------------------------- ---- - ---- -------------------------------------------------------------------------------------- -- ----------- Permanent Pool Inflow Riprap Backed With Filter Cloth 5 /0 0 -9 Marsh Zone - 25%-- Littoral Shelf 9"-18" Marsh Zone 10' Wide Forebay Marsh Zone Drain 3' Deep W/ Valve Stable Outfall Pool Reverse Pipe Riprap and 3' Deep W/ Trash Guard Filter Cloth Anti-Seep Collar Not Scaled Basic Plan of Stormwater Wetland With Access Road for Maintenance Not Scaled Stormwater Wetland Planting Design See Table For Specific Plant List Forebay ~~ - ~~~~ - IIII - I II .IIII I °IIII =_ IIII II - II -IIII . IIII - _ Forebay ~~o~ ~~ II = = _ _ °IIII II - II -1 - --- __ __--- _.--_- - - I-1111-111 ~ - II-1111 1111-111 - I-11 1111-IIII-IIII-~_ __.-'__- __- 11= ~ -1111 -1111- -111 II-1111= = I-1111- __ _"- -_-- 1111-1111 -1111-1111=~ 1=1111 '- _.,,.,~sccTl~ muu - uu = uu - uu ~. ~ ~~~~ ~ _. ~z Marsh 9"-18" k.uu'~' Littoral Shelf ~~I Marsh 0"-9" Embankment with Marsh Plants IIII -IIII IIII -IIII - Upland Non-Submergent =IIII -IIII Pools 3' Deep Stormwater Wetland Typical Design ~ Length to Width Ratio: 3:1 ~~/o~t High Marsh Zone 10' Wide 6:1 Slope Littoral Shelf Side Slope Ratio: 3:1 Forebay ~. ,~%~t ~. , ~.. L.,J r ~~ `i,~i Deep Pool `. Forebay ~ ~ ~o ~c Extended Wetland Zone _- _ -~ -~ - `. _~ _ ~ _ _ , -- . -_ _. - iii=uu -- m%mi Micropool - -- °iiu=_°°~ _- ~~ _- :~ Stable Outflow ................ . Earthen Berm Max Storm Water Level Not Scaled Stormwater Wetland Specific Plant List* Marsh 9"-18" & Littoral Shelf Juncusspp. Carex spp. Echinochola spp. Leersia spp. Scirpus spp. Sparganium spp. Panicum spp. Setaria spp. Rushes Sedges Wild Millet Rice Cutgrass Bulrushes Burreeds Panic Grass Bristle Grass Marsh 0"-9" & Embankment Upland: Scirpus pungens Hibiscus mos. Leersia spp. Carex spp. Scirpus spp. Polygonnum spp. Juncus spp. Acorus cal. Acer rubrum Faxinus perm. Betula nigra Itea virgin. Saururus cern. Impatiens cap. Onoclea sens. Arundinaria gig. Common Three-Square Marsh Hibiscus Rice Cutgrass Sedges Soft-Stem Bulrush Smartweed Soft Rush Sweet Flag Red Maple Green Ash River Birch Virginia Willow Lizard's Tail Jewelweed Sensitive Fern Giant Cane * Out of the above list there will be at least four of the species planted per zone. Alternative species may be used if approved in advance by the engineer. Dry Basin Specifications: The calculations for the two proposed dry basins are below. The design specifications used for these basins are as made available in the "Stormwater Best Management Practices" manual compiled by NCDENR Division of Water Quality (1999). The basin length to width ratio is 3:1 as well as a side slope ratio of 3:1. Inlet and outlet erosion control measures are designed by using riprap and filter cloth. Grasses that are tolerant of frequent inundation will be planted on the slopes and within the basin. The orifice has been calculated to control the release of stormwater to the jurisdictional streams. See DWQ's Extended Dry Detention Basin Worksheet for a checklist of the required information. Extended Dry Detention Basin 1: Lot 6 drainage area to wetland (on-site) 7.85 ac. impervious area (on-site) 4.47 ac. impervious % 57% Required Temporary Storage Volume Rv = 0.05+.009 (57) = 0.563 in/in volume = 1" * 0.563 * 7.85 acres/12 = 0.37 ac-ft = 16,043 cu-ft add 20% additional volume for sediment storage = 19,252 cu-ft Dry Basin Dimensions: 40' by 140' (3.5 ft deep) Below are the calculations for the orifice sizing: Compute release rate for temporary storage volume over 2 to 5 days and orifice size WQ volume = 0.37 ac-ft Q2 = 0.37"43560/48"3600 = 0.093 cfs Q5 = 0.37"43560/120"3600 = .04 cfs Average head = 1.5 ft. Orifice Eq. Q = CA(2gh)^0.5 for Q2:.093 = .6'`A ((2 (32.2)(1.5))^0.5 A = .016 Sq-ft dia. = 1.7" for Q5:.04 = .6*A ((2 (32.2)(1.5))^0.5 A = .007 Sq-ft dia. = 1.1" use 1.5" pipe with negative slope and trash guard Extended Dry Detention Basin 2: Lot 8 drainage area to wetland (on-site) 6.2 ac. impervious area (on-site) 3.35 ac. impervious % 54% Required Temporary Storage Volume Rv = 0.05+.009 (54) = 0.54 in/in volume = 1" * 0.54 * 6.2 acres/12 = 0.28 ac-ft = 12,200 cu-ft add 20% additional volume for sediment storage = 14,600 cu-ft Dry Basin Dimensions: 40' by 120' (3.5 ft deep) Below are the calculations for the orifice sizing. Compute release rate for temporary storage volume over 2 to 5 days and orifice size WQ volume = 0.28 ac-ft Q2 = 0.28"43560/48'`3600 = 0.071 cfs Q5 = 0.28*43560/120'`3600 = .03 cfs Average head = 1.25 ft. Orifice Eq. Q = CA(2gh)^0.5 for Q2:.071 = .6"A ((2 (32.2)(1.25))^0.5 A = .013 Sq-ft dia. = 1.6" for Q5:.03 = .6"A ((2 (32.2)(1.25))^0.5 A = .006 Sq-ft dia. = 1.0" use 1.5" pipe with negative slope and trash guard Not Scaled Inflow .. 1 Riprap and filtercloth ~~, ~ ~ ',, ~ f ~ ~ r~ { to energy J , e ~ used to dissipa ; ,~ ~ i, ~ ~ ~ a' ~ ~~`i ~ 4 ~ , ' ~ ~ ~ ~~~ ,, ~ ~~ ~ ~ ~ ~I ~,~ ~ ~ a ~ ~, ~. r I~ ~ `' V Y ~ ~ p~' ~ ~l. a / ~ ~ ~ ~ ti ~ ~ ~ ~~_ ~" r ~- ~ ~ ~ ~ -~ ~ ~ I f i~ Small Outlet Orifice to } ~, ~ ~,F PA ~,, ~ Control Stormwater _ ~ ~'I n Forebay ~ ~~~ ~~~ ~~,, a ~~ ~~ Flow into Receiving Area ~ ~ ~ ~ ~~ A ~ ~ ~ ~~ ^` Water _ _~ ~~ _~ r i ~. t~ ~ ,1~ ~ ~ ;p ~ ~ i~ i, ~~~II~~ ~ ~~ h Al ti ~ ~ ~ ,~~ , ~ ,~~ ~ ~ ~~ ~ ~ ~ ~,. , , f ~ /r r , 'i ~~ P ,~ ~~~ P~ ~ ~ ~ h Access for Maintenance Embankment and Spillway with Riprap and Filter Cloth for Stabilization Dry Detention Basin Typical Plan and Profile Length to Width Ratio: 3:1 Side Slope Ratio: 3:1 The basin and slopes will be planted with grasses that can withstand frequent inundation. Grasses: Wiregrass American Cupscale Barnyard Grass Grass (creeping) Other species of grasses may be used if Approved in advance by the engineer. Compacted Earthen Embankment With Riprap and Filter Cloth for Stabilization Y~-° Outlet Orifice Stormwater Detention Level Inflow ~ ~PY ~~(pV~{~ ~Y~Y Y~ `I ~ 1"~ Riprap and Filter Cloth ,YYY ~~ Inlet Protection ~ Anti-seep Collar Forebay Stable Outlet with Riprap and Filter DWQ Project No. DIVISION OF WATER QUALITY -401 EXTENDED DETENTION (and POCKET*j WETLAND WORKSHEET I. PROJECT INFORitgATION (please a the following Project Name • Sh~~ti~c~ five laoy-~~-4` - ~ [~ Contact Person: T k~ V. t4 S - -Phone Number. j~Z81 oZ9 ~--b sy 6 For projects with multiple trasins, speafy which trasin this worksheet applies fo: S 1+J We~fda.~d 13as ~^ # / Permanent Pool Elevation 3 ft. ~'~" Temporary Pool Elevation S ft ~~ (elevation of the orifice invert out) (elevation of the outlet structure invert in) Permanent Pool Surface Area aC~~ U ~ d sq. ft. Drainage Area a 3.99 ac. Impervious Area ~i . (oS ac. Forebay Surface Area 3 re O o s`q.Tt.' Marsh 0"-9' Surface Arm ~-o c~ C~ sq. 1t: Marsh 9' 18' Surface Area ~ d C9 O sq. R` Micxo Pool Surface Area -- -- ~'-/ U O sq. ft. Temporary Pool Volume 35 ~ }Z V cu. ft. SAIDA used . D 1 }3 Diameter of Orifice ~•" in. II. REQUIRED REMS CHECKf~~ (water surface area at permanent pool elevation) (an-site andoff-site drainage 1o the basin) (on~ite andoff-site drainage to the basin) (at permanent pool elevation approximately 15%)' (at Permanent Pod devatiion approuam-ate~r 35%)• (af perriiaitetit jSoal-~i~oft'~y 35%)' (at permanent pod elevation approximately 15°k)' (volume detained on top of the permanent pool) (surface area to drainage area ratio)' (draw down orifice diameter) Initial in the space provided to indicate the fdlovuing design requirements have been met and supporting documentation is attached. _ If_a requir,3ment has not been met, attach an explanation of why. At a minimum, a complete stomrwater management plan sutxnittal indndes a worksheet thr each BMP, design calc•,ulatrons, plans and speafications showing all BMPs and outlet shudure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An int~mptete submittal package will result in a request for additional information and will substantlally delay final review and approval of the project The terrrpordry pod controls runoff from the 1 arcf- rain. The basin side slopes are rro st3seperthan 3:1. A planting plan for ftre marsh areas with plant species and densities is provided. Vegetation above the pernranerrtpod devatron-+s died. An enrergerrc~r drain is provided to drain the basin. The temporary pod draws down in 2 m 5 days. Sedrrrent storage is provided n the petmarrerrt pod. A sed'.rrerrt disposal area is provided. Access is provided for mair>~ance. A site spea6c, signed and rrotarimed operation and mairierrarrce agreerrrertt is provided. The drainage arena (9 any oifstie area) is dePareated on a site plan. Amens is provided for rtnairdenarrce_ Phan detail for the wetland are provided. Plan detais for the irdet and annilet are provided. i' -' A site spea6c aperationn and mairdenarroe agr+eerrnent, sicpned and rnotatmed by the responsible patty s provided (see ht~JAr2o.ehnrshaterrc. .doc)_ 'Pocket Wetlands have different design parameters and are only assumed to remove 35% TSS -See pp.19and 20 of the NC DENR Stormwater BMP Manual, April 1999.10°Ao open water, 50% high marsh, 40% low marsh. ~~ Elev~~ ass ~~sr~ o+~ S~-f C~~tises ire self ea( pn bps «r oaf (`~~,ef DWQ Project No. DNISION OF WATER QUALITY -401 EXTENDED DETENTION (and POCKET') WETLAND WORKSHEET I. PROJECT INFORMATION (please complete the ProjedName: ~hu-}v~J l~~ef~.~-+,Q.~-r' Tc~+e ts~va Feu- m~-t Contact Person: ? ~~. V• (4 s Phone Number: j~Zg) dZ9 }-b g4 6 For projects with multiple basins, spedfy which basin this worksheet applies to: ~ W WeflaRrl Qar.~ # Z Permanent Pooi Elevation Temporary Pod Elevation Pemnanent Pod Surface Area Drainage Area Impervious Area Forebay Surface Area Marsh 0°-9" Swfaoe Area Marsh 9° 18' Surface Area Mirxo Pod Surface Area •- _. Temporary Pooi Volume SAIDA used Diameter of Orifice REQUIRED ITEMS CHECKI~~T .3 ft. ~ * (elevation of the orifice invert out) ~S ft ~~ (elevation of the outlet structure invert in) z ti, ~ o o sq. rt. ~.3. SS ac. ~ a. 33 ac. 4r ~ ~ t7 s`q: ft.' 8 `~O O sq. tt g4D0 sq.ft;` 8 0 sq. ft (water surface area at permanent pool elevation) (on-site and off-site drainage to the basin) (on~ite and cif-stie drainage bo the basin) (at permanent pool elevation approximately 15%)• (at pemraneM pod elevation apprwdmately 35%), (at permarrerit pooiY~ appro~rnatelY 35%)• (~ P P~ elevation approximateht 1596)• ~f 5 , 3 0 oZ cu. ft. (volume detained on top of the permanent pool) • D a t 3 (surface area to drainage area ratio)` a • S in. (draw down orifice diameter) Initial in the space provided to indicate the fdlowing design requirements have been met and supporting documentation is attached.- If_a requirement has not beer- met, attach an explanation of why. At a minimum, a complete stormwater management plan submiittal includes a worksheet for each BMP, design c~culations, plans and speafications showing all BMPs and outlet stnu~ure details, a detailed drainage plan and a fur executed operation and maintenance agreerent. An incomplete submittal package will result in a request for additional information and will substantialty delay final review and approval of the project ;f he Temporary pod conhols nndl' ifi~om the 1 Bch rain. The basin side skrpes are no steeper ihan 3:1. A plantung plan for the marsh art'as vdih plant speaes and densities is provided. Vegetation above the permanent pod elevatiorris aped' red. An errtergerrc~t drain is provided b drain the basin. The temporary pod draws dawn in 2 ba 5 days. ~ Sedinent storage is provided it Bre perrrrarrerrt pod. A sediment disposal area is provided. Access is provided for mainterranoe. A shoe speaGc, sired and notar~ed operation acrd mairtenarroe agreement is provided i!' The drainage area fmrdrrdn9 any oftsr~e area) is detirreabed on a srte plan. mil'' Access is provided for mairdenance_ !/~ Ptar detais fnr the wetland are provided. G' Plan detais for the ~ and outlet are provided. A shoe speatic operation and mairNenarroe agreement, signed and rrotariaed bit the resporrs~rle ~ ~ P (~ http:llh2o.ehnrstatenc. .doc). 'Pocket Wetlands have different design parameters and are only assumed to remove 35°~ TSS -See pp.19and 20 of the NC DENR Stormwater BMP Manual, April 1999.10% open water, 50% high marsh, QO°~ low marsh. ~-~(- EIevN--~ o.~s ~ks.ect ~.n s~,~~' rJ. K~.~.ts ~ns~.\ttcA `n. 13..~s:~s ~ J~•~S~r DWQ Project No. DIVISION OF WATER QUALITY -401 EXTENDED DETENTION (and POCKET`) WETLAND WORKSHEET l'Rf~CT INFORIAATION (please complete the idbwing Project Name: Sties-~~~! I~vPt~on.Q.~+-T~~~ Kind PD-wi~-t Contact Person: T k.. V.!4 s Phone umber: Z8 oZ9 -~ ~U 6 For projects with mu~ple basins, specify whidr basin ibis worksheet aE-plies to: S W W 1o~nc1 l~a.s ~ 3 Permanent Pool Elevation 3 ft ~~ Temporary Pool Elevation S ft ~ ~ (elevation of the orifice invert out) (elevation of the outl~ structure invert in) Permanent Pool Surface Area ~ OCR d sq. ft. Drainage Area S• y 9 ac. Impervious Area a .9 ac. Forebay surface Area j o g o s'q.-ft.- Marsh 0"-9' Surface Area 2 l U b sy. ft; Marsh 9'-18' Surfaoe Area ~ 1 O O sq. ft.. ~-- Micro Pod Surface Area .... ~f DD sq. ft. Temporary Pool Volume IUY, 5 (a L cu. ft. SAlDA used • U ~ `l ~- Diameter of Orifice / • S in. 11. REQUIRED ITEMS CHECK~I~T (water surface area at permanent pool elevation) (on-site and ofd site drainage to the basin) (on~ite and off-site drainage to the basin) (at pemnanent pod elevation ~proximatehl 15%)' (~ P Pool elevation approxunafely 35%)• (a[ perrirarlerit poal~iatlo(ii appfoxairabely 35%)• (at permanent pod elevation approximately 15°k)` (volume detained on top of the permanent pool) (surface area to drainage area ratio)` (draw down orifice diameter) Initial in the space provided to indicde the foAowing design requirements have been met and supporting documentation is aftached._ lf_a requirement has not been met, attach an exp/anafiorr of why. At a minimum, a complete stomrwater management plan submittal fnk~udes a worksheet for each BMP, design calculatiars, plans and speafirations showing all BMPs and outlet structure details, a detailed drainage plan and a fulty executed operation and maintenance agreement. An incomplete submftal package will result in a request for additional information and will sut~stantidy delay final review and approval of the project The iarrrporary pool controls runoff from the 1 arch rain. ;the basin side skrpes are ra sieeperitrran 3:1. A planting plan for the marsh arms widr plats speaes and derrstiies s provided. Vegetation above the perrrraneM pool elevaiion.isspec~ied. r errrergerrq-gain isprovided bdrain ihebasin. to tr'anporary pod draws down in 2 b 5 days. airrrerrt sbrage is provided in the perrrrainent pod. sed'ment disposal area is provided. Loess is provided far nrain6enarroe. site sped signed and nofarimed operation and rnairierranoe agreement is provided. ~ ~~ area f9 ~- o~sle area) is an a sit3e plan. Loess is provided for rrrairdenarrce. Ian detail far the wetland are provided. Ian detels for the e-{et and collet are provided. _ ~7.."„'A she speaGc operat9ion and mairderrarroe agreenre<rt, signed arrd notaria®d by the respotrs~e party is txavided (see http:lltr2oehrrstame.rrc. .doc). ` Podket Wetlands have different design piers and are only assumed to remove 3596 TSS - See pp.19and 20 of the NC DENR Stormwater BMP Manuel, April 1999.10% open water, 50% high marsh, 40% low marsh. ~~ [levak~ctn, ~o.5ec~ ~A 5~°~-3'~~.~k~~ ivks~[fr~e( F~ bas;~ a-~ i`~SeJ"', DWQ Project No. DIVISION OF WATER QUALITY •401 EXTENDED DETENTION (and POCKET) WETLAND WORKSHEET I. PROJECT INFORMATION (please complete the folowing infiormation}: Project Name : Shc~-4'vr~ ~~p (~oy,,~,~-(- - ~~~e g) vc{ PD- wt ~-t Contact Person: ? k.~ V. !4 s Phone Number: ZS oZ 9 - b 9 ~/ ~ For projects with multiple basins, specify which basin this worksheet applies to: S ~ W*z, c~ ~ t3~ s Permanent Pool Elevation 3 ft. * ~ (elevation of the orifice invert out) Temporary Pool Elevation S ft ~ ~- (elevation of the outlet structure invert in) Permanent Pod Surface Area Drainage Area . impervious Area Forebay Surface Area Marsh 0"-9° Surface Area Marsh 9"-18" Surface Area Micro Pod Surface Area ._ ._ a~ ff'U d sq. ft ~!. O S ac. ! • 33 ac. 5~~! "s`q.it.' G S'O sq. ~. 9 $ V sq. ft.` .._. ~fDr~ sq. ft. (water surface area at permanent pool elevation) (on~ite and off-sr~e drainage to the t><+sin} (an-site and ofl-site drainage b the basin) (at permanent pool elevdion approximately 1596)' (at permanent pod elevation approximately 35°~)' (af pemiadpritpoi~t'eleVatbff~aPproX'imately 35°~)` (at permanent pool elevation approximately 15°k)" Temporary Pool Volume SAIDA used Diameter of Orifice II. REQUIRED REMS CHECKI ITT S.zUy a,. ft. .oly~ !~ v in. (volume detained on top of the permanent pool) (surface area to drainage area ratio)' (draw down orifice diameter) initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. _ 1f_a requirement has not been met, attach an exp/anatlon of why. At a minimum, a complete stormwater management plan sutxniftal includes a worksheet for each BMP, design calculations, plans and speafications showing all BMPs and outet structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for additional information and will substantially delay final review and approval of the project The temporary pool controls ruraif from the 1 inch rain. :!r' The basin side slopes are no sleepert#rarr 3:1. _ _ A planting plan for the marsh areas with plant species and derrsMes is provided. ` ~ Vegetation above the penrraneM pod elevabion.is . G'" An emergency dray is provickd b drain the basin. The temporary pod draws down in 2 b 5 days. ~' ~ /Gf Sedment sbrage is provided n the permanent pod. ~.._ A sediment disposal area is provided. Acoe~ is provided for maarlerrarrce. _ A stie specific, sic,~ed and ratarmed operation and mairesnanoe ageerrrerrt is provided. The area f9 ~Y otTsite arm) s dettrteaked on a site plan. f1l'~ Access is provided far mairrlerrarroe. !~ Pharr detafis tar the wetland are provided. G'' Plan details for the urlet and outlet are provided. ' ~ ~ A site specific operation and rnainlenanoe , signed and notarised by the ~ PAY ~ P (~ 1dtpJlh2o.ehnrsiate.nc. .doc). 'Pocket Wetlands have different design parameters and are only assumed to remove 35°k TSS - See pp.19and 20 of the NC DENR Stomtwater BMP Manual, April 1999.10% open water, 5096 high marsh, 40% low marsh. .~- ~ ~ ! f. ~ o..°~ ~`vn S ~~ S e e,~ a'~ S~'F'f ~ tAa ~,t 5 ~ S-I-~~1 ~ c~ n b ~S ~ n o~-~- ~`i5 Q r: Projed No. DWQ DIVISION OF WATER QUALITY 401 EXTENDED DRY DETENTION BASIN WORKSHEET DWQ Stormwater Management Plan Review: At a minimum, a complete stormwater management plan submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for additional information and will substantially delay final review and approval of the project PROJECT INFORMATION (please complete the following information): Projed Name Contact Person: Phone Numt~er: For projeds with multiple basins, spedfy which basin this worksheet applies to:_ C~~^ ~~ 17 ry ga..s : ~ # 1 Drainage Area:~acres Percent Impervious Area: 5~ °A _ . _ _ _ II. REQUIRED ITEMS CHECKLIST The following checklist outlines design requirements per the Stormwater Best Management Practices Manual (N.C. Department of Environment, Health and Natural Resources, November 1995) and Administrative Code Section: 15 A NCAC 2H .1008. Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a requirement has not been met, attach an explanation of why. ~licants Initials ,~ Either capture runoff from 1 yr., 24 hour storm and release over a 48 hour period, or capture runoff from 1 inch storm and draw down over a period of 2 to 5 days. -- Please provide routing for 1 yr. 24 hr. event or volume from 1 inch rain /ld~a*-f3 c k --F~ v The basin length to width ratio is greater than 3:1. The basin side slopes are no steeper than 3:1. A small permanent pool at outlet orifice is provided to reduce dogging. An emergency drain to completely empty the basin is provided. Vegetation plan prepared is spedfied on plans. Basin to be stabilized within 14 days of oonstrudion is spedfied. - Sediment storage (20% of detention voume} in addition to detention voume is provided. Inlet and outlet erosion control measures to prevent scour are provided. Additional treatment to meet the 85% TSS removal efficiency is provided. Access for dean-out and maintenance is provided. Inlet plunge pod or other energy dissipation is provided. Forebay is provided to rapi<-re sediment and minimize dean-out problems. Uncompac~ed natural soils are utilized bD promote vegetation and reduce sedimentation. Seasonal high water table is at least 1 foot trebw bottom of basin. /~_tf used as a temporary sediment basin, plans indicate dean-out prior to final operation. A site spedfic operation and maintenance plan with the foAowing provisions is provided. The O&M agreement is signed by the responsible party and notarized. Project No. DWQ DIVISION OF WATER QUALITY 401 EXTENDED DRY DETENTION BASIN WORKSHEET DWQ Stormwater Management Plan Review: At a minimum, a complete stormwater management plan submittal includes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for additional information and will substantially delay final review and approval of the project PROJECT INFORMATION (please complete the following information): Project Name : 5 ~u.~'aro~ '- l`o.-~e~ t31 u~( ~ 1~ - M t~ Contact Person: J`c~Lu~. ~Uc1k-s Phone Number: -~ _. For projects with multiple basins, specify which basin this worksheet applies to:_ Drainage Area:(o,Z..acres Percent Impervious Area:°~ ._. __ II. REQUIRED ITEMS CHECKLIST The following checklist outlines design requirements per the Stomtwater Best Management Practices Manual (N.C. Department of Environment, Health and Natural Resources, November 1995) and Administrative Code Section: 15 A NCAC 2H .1008. Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a requirement has not been met, attach an explanation of why. Apalicants Initials .~ Either capture runoff from 1 yr., 24 hour storm and release over a 48 hour period, or _ ~/ G- capture runoff from 1 inch storm and draw doom over a period of 2 to 5 days. -- Please provide routing for 1 yr. 24 hr. event or volume from 1 inch rain lv? , 2 o v c~ - ~'-~ /J~ li The basin length to width ratio is greater than 3:1. . C.~~ The basin side slopes are no steeper than 3:1. ~ A small permanent pool at outlet orifice is provided to reduce dogging. . G' An emergency drain to cornpletely empty the basin is provided. ~ Vegetation plan prepared is specified on plans. ~" Basin to be stabilized within 14 days of oonstrudion is specified. - Sedimentstorage (20% of detention voume) in addition to detention voume is provided. Inlet and outlet erosion oonirol measures to prevent scour are provided. Additional treatment to meet the 85% TSS removal efficiency is provided. Access for dean-0ut and maintenance is provided. Inlet plunge pool or other energy dissipation is provided. Forebay is provided to capture sediment and minimize dean-out problems. Uncompad:ed natural sals are utilized bo promote vegetation and reduce sedimentation. Seasonal high water table is at least 1 foot bebw bottom of basin. ~'" If used as a temporary sediment basin, plans indicate dean-out prior to final operation. r A site specific operation and maintenance plan with the following provisions is provided. The O&M agreement is signed by the responsible parry and notarized. WETLAND DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT Shuford -Tate Boulevard PD-MU Development Hickory, North Carolina The wetland detention basin system is defined as the wetland detention basin, pretreatment including forebays and the vegetated filter if one is provided. Maintenance activities shall be performed as follows: After every significant runoff producing rainfall event and at least monthly: a. Inspect the wetland detention basin system for sediment accumulation, erosion, trash accumulation, vegetated cover, and general condition. b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within 2 to 5 days as designed. 2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow vegetative cover on side slopes to maintain a maximum height of six inches, and remove trash as needed. 3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to maintain proper functioning. 4. Remove accumulated sediment from the wetland detention basin system semi-annually or when depth is reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality (i.e. stockpiling near a wet [wetland] detention basin or stream, etc.). 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. For stormwater wetlands: If the elevation of the marsh areas exceed the permanent pool elevation, the sediment should be removed to design levels. This shall be performed by removing the upper 6 inches of soil and stockpiling it. Then the marsh area shall be excavated six inches below design elevations. Afterwards the stockpiled soil should be spread over the marsh surface. The soil should not be stockpiled for more than two weeks. When the permanent pool depth reads 2.25 feet in the forebay, the sediment shall be removed. BASIN DIAGRAM (fill in the blanks) Permanent Pool Elevation 3.0' Sediment R oval EI. 0.75' 75 /° Sediment Removal Elevation 0.75' 75% -------------- -- Bottom EI vation 0.0 % ------------------------------------------- ------ FOREBAY Bottom Elevation 0.0' j 25% MAIN POND 5. Remove cattails and other indigenous wetland plants when they cover 50% of the forebay or micro-pool surface. These plants shall be encouraged to grow along the vegetated shelf and forebay berm. Wetland planting densities in the marsh areas should be maintained by replanting bare areas as needed. Wetland plants should be encouraged to grow in the marsh areas. 6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain shall be minimized to the maximum extent practical. 7. All components of the wetland detention basin system shall be maintained in good working order. Page 1 of 2 vnn, LJ• LVV I ! ~ JLnni i. ~~~vv~.~ 8. Level spreaders or other structures that provide diffuse flow shall be maintained every six months. All accumulated sediment and debris shall be removed from the structure, and a level elevation shall be maintained across the entire flow spreading structure. Any down gradient erosion must be repaired and/or replanted as necessary. I acknowledge and agree by my signature below that I am responsible for the performance of the seven maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsibre party. Print n Title: G. ~'~ Ltk! + 5 ~c.~ 0 2 ~ r ~2 _ n-e~.( 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 ~aj~;~ Y. ~ ~3 , a Notary Public for the State of .~1/0~~/>`i ~Yd~ County of ~~~ ~ , do hereby certify that _ G .~/K~t 1'ficr.,~'or~ ~ personally appeared before me this ~~ ay of n uC~. , ~. and acknowledge the due execution of the forgoing wet (wetland] detention basin maintenance requirements. witness my hand and official seal, _ U ~r.~ ~ao~ ~ ~drl~N Ga~r~r flab er ftJedP caroww carwWrlor~ p~lros evr 20, tom s~ My commission expires_ h~~d/~7 The above Operation and Maintenance AgreemQnt will be binding for alt future landowners of the aforementioned project sites. Page 2 of 2 EXTENDED DRY DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT Shuford -Tate Boulevard PD-MU Development Hickory, North Carolina The extended dry detention basin system is defined as the detention basin and pretreatment area including forebay. Maintenance activities shall be performed as follows: After every significant runoff producing rainfall event and at least monthly: a. Inspect the extended dry detention basin system for sediment accumulation, erosion, trash accumulation, vegetated cover, and general condition. b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within 2 to 5 days as designed. 2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow vegetative cover on side slopes to maintain a maximum height of six inches, and remove trash as needed. 3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to maintain proper functioning. 4. Remove accumulated sediment from the extended dry detention basin system (including forbay) semi- annually or when depth is reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality (i.e. stockpiling near a wet [wetland] detention basin or stream, etc.). 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. BASIN DIAGRAM (fill in the blanks) Permanent Pool Elevation 3.0' Sediment moval EL 0.75' ~ 7 /o Sediment Removal Elevation 0.75' 75% ----------------------------- ------ Bottom E vation 0.0 5% ~ , FOREBAY MAIN POND 5. Remove cattails and other indigenous wetland plants when they cover 50% of the forebay or micro-pool surface. These plants shall be encouraged to grow along the vegetated shelf and forebay berm. Wetland planting densities in the marsh areas should be maintained by replanting bare areas as needed. Wetland plants should be encouraged to grow in the marsh areas. 6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain shall be minimized to the maximum extent practical. 7. All components of the wetland detention basin system shall be maintained in good working order. Page 1 of 2 vnn, LJ~ LVUf / ~ JGr~in i ~~~~~vv~,~ 8. level spreaders or other structures that provide diffuse flow shall be maintained every six months. All accumulated sediment and debris shall be removed from the structure, and a level elevation shall be maintained across the entire flow spreading structure. Any down gradient erosion must be repaired andlor replanted as necessary. I acknowledge and agree by my signature below that I am responsible for the performance of the seven 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. Print C, ~~kOJ ~ S 1~,~02~ ~ ~2 Note: The legally responsible party should not be a homeowners association unless more than 5d% of the lots have been sold and a resident of the subdivision has been named the president. I ~(,,~j~; ~ ~ ~ ~~ , a Notary Public for the State of ~ ~1 ~Yal ~ County of _~ ¢~ , do hereby certify that G .~/K o ~ personally appeared before me this ~r ay of _ .~C~n u~• ~• and acknowledge the due execution of the forgoing wet (wetland] detention basin maintenance requirements. Witness my hand and official seal, ~r.~ Naar n,eMc c~rsd~.rt ca.,e- sta. er NeAB carow+a Carrwrrron aDNsri rwr 20, 2ou7 sF~ My commission expires_ ~~d~Q'7 The above Operation and Maintenance Agreement will be binding for alt future landowners of the aforementioned project sites. Page 2 of 2 Title: ~~.,ts a >,~N~ , Sl-i~~a~c ~ ~Y~''[..oP/~'re~'T'.~L Address: ~ ~ ~ , ~oi~ zz~' /-~-,~R nI C T~'L o3