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HomeMy WebLinkAbout20070708 Ver 1_401 Application_200704071447 S. Tryon St. Charlotte, NC 28203 704-334-4454 FAX 704-334-4492 Apri14, 2007 O?'07~8 Ms. Cyndi Karoly NC DENR Division of Water Quality, Wetlands Unit 1650 Mail Service Center Raleigh, North Carolina 27699-1650 Subject: Pre-Construction Notification/401 Certification Package Wilkes Community College Pond and Stream Restoration Wilkes County, North Carolina Dear Ms. Karoly: Please find enclosed seven copies of our PCN package for the subject project. following supporting data: • PCN form, • Vicinity, USGS, and soil maps, • existing conditions and design summary, • photo log, and • 11" x 17" copy of the 60% plan set. PAYMENT RECEIVED We have included the The goal of the project is to enhance the water quality and ecological function of the existing 1.8 pond located on Wilkes Community College campus. The proposed work includes the creation of a sediment forebay, creation of deep water areas, redesign of the outflow structure, and creation of an aquatic bench. The project also includes stream restoration on 36 feet of intermittent stream channel that serves as the outflow of the pond to Moravian Creek. This same information has been submitted to the Raleigh Regulatory Field Office of the US Army Corps of Engineers. If you have any questions, please call me at (704) 319-7887. Si erely, ~' ~_. L d A Dixon, PE Project Manager 7 Q~~r~adap APR 2 3 2007 Office Use Only: Form Version March OS 07 •o7os USAGE Action ID No. DWQ No. (If any particular item is not applicable to this project, please enter "Not Applicable" or "N/A".) I. Processing PAY[~ENT RECEIVED 1. Check all of the approval(s) requested for this project: ® 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 43 and 27 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), check he~e:~~~ II. Applicant Information ~ ~ D APR $ 3 2007 1. Owner/Applicant Information Name: John Caviness ~R - WATER QllAU7Y_ _ __ ...•.....r,s •w rrne~ItuTeo nRAWPJI Mailing Address: Resource Institute. Inc 2714 Henning Drive Winston-Salem, NC 27106 Telephone Number: 336-750-0522 Fax Number: E-mail Address: jcaviness(c~carolina.net 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: Lloyd Dixon, PE Company Affiliation: Buck En in~g, A Unit of Michael Baker Mailing Address: 1447 S. Tryon Street Charlotte, NC 28203 Telephone Number: 704-334-4454 Fax Number: 704-334-4492 E-mail Address: ldixon(a~mbakercorp.com Updated 11 / 1 /2005 Page 1 of 9 III. Project Information 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 project: Wilkes Communit.~ge Pond and Stream Restoration -Phase I 2. T.I.P. Project Number or State Project Number (NCDOT Only): 3. Property Identification Number (Tax PIN): 3857-55-8394 4. Location County: Wilkes Nearest Town: Wilkesboro Subdivision name (include phase/lot number): Directions to site (include road numbers/names, landmarks, etc.): From Charlotte - I-77 N, US 421 N, left onto NC-268/River Street, right onto N. Collegiate Drive. Ends at Wilkes Communit.~ge, 1328 Collegiate Drive, Wilkesboro, NC 28697 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): 36.136828° °N 81.180306° °W 6. Property size (acres): 72 acres 7. Name of nearest receiving body of water: Moravian Creek 8. River Basin: Yadkin River Basin (Note -this must be one of North Carolina's seventeen designated major river basins. The River Basin map is available at htt~p://h2o.enr.state.nc.us/admin/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 site is located in the center of Wilkes Communit~ollege. The pond is currently showing signs of excessive sedimentation from developmental activities in the watershed and standing~ipes that drain to the pond, as well as Updated 11 / 1 /2005 Page 2 of 9 fecal contamination from native and non-native waterfowl. The drainage area of the pond is 56% Institutional 30 % forested and 14% Institutional/Open Space. 10. Describe the overall project in detail, including the type of equipment to be used: The existing 1.8 acre pond has been redesi~ed to enhance its water quality and ecological function. To achieve this goal the normal water surface elevation will be lowered to allow stormwater pipes to drain fully. A sediment forebay is designed at the outlet of pipes which contribute the majority of sediment load from the watershed. Surface area of the permanent pool is mar ig Wally decreased and the average depth is increased to bringing the SA/DA ratio into the range associated with 85%TSS removal efficiency. Deep water areas are proposed to provide varied habitat. A riser barrel structure is designed with a low flow orifice that retains and slowly releases the water quality storm over 4 days in order to maximize settling of pollutants. An aquatic bench to be planted with aquatic and wetland species is proposed along the perimeter of the pond. In addition to providing improved nutrient uptake, increased sedimentation and diverse ecological and biological habitat, the littoral shelf will act as a shallow safety bench. Also part of the project is the redesign of the outfall channel from the riser barrel structure to natural channel design specifications. For more details on the plan and equipment to be used, please see the attached 60% plan set. 11. Explain the purpose of the proposed work: The project focuses on altering existing storage and outflow hydraulics in the 1.8 pond to improve water quality and create varied aquatic habitats to improve ecological and biological function of the pond. ~ecificallY the project will allow drainage of stormwater pipes, increase TSS removal efficiency, create varied habitat, and increase the nutrient uptake of the pond. 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. NA 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. NA Updated 11 / 1 /2005 Page 3 of 9 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: The impacts to the existing pond are temporary. Post construction the overall pond size will increase 0.02 acres. The impacts to the intermittent outflow channel are also temporary. The existing 36 feet of stream will be relocated and meandered to increase the length of stream to 205 linear feet. There are no wetland impacts as part of this project. 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 (yes/no) Distance to Nearest Stream (linear feet) Area of Impact (acres) Total Wetland Impact (acres) 3. List the total acreage (estimated) of all existing wetlands on the property: NA 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 Perennial or Average Impact Area of Number Stream Name Type of Impact Intermittent? Stream Width Length Impact (indicate on ma) Before Im act (linear feet) (acres) Updated 11 / 1 /2005 Page 4 of 9 I Unnamed outflow channel Temporary Intermittent 2 36 .002 Total Stream Impact (by length and acreage) 36' .002 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 fill, excavation, dredging, flooding, drainage, bulkheads, etc. Open Water Impact Name of Waterbody Type of Waterbody Area of Site Number (if applicable) Type of Impact (lake, pond, estuary, sound, bay, Impact (indicate on ma) ocean, etc.) (acres) 1 Wilkes Pond Temporary pond 1.8 Total Open Water Impact (acres) 6. List the cumulative impact to all Waters of the U. S. resulting from the prof ect: Stream Impact (acres): .002 Wetland Impact (acres): 0 Open Water Impact (acres): 1.8 Total Impact to Waters of the U.S. (acres) 1.802 Total Stream Impact (linear feet): 36 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. NA 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.): NA Proposed use or purpose of pond (e.g., livestock watering, irrigation, aesthetic, trout pond, local stormwater requirement, etc.): NA Current land use in the vicinity of the pond: NA Size of watershed draining to pond: NA Expected pond surface area: NA Updated 11/1/2005 Page 5 of 9 VII. Impact Justification (Avoidance and Minimization) Specifically describe measures taken to avoid the proposed impacts. It maybe 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. The planned restoration work on the pond will improve the function of the pond in treating stormwater before it enters Moravian Creek including nutrient and TSS removal. The project will also improve habitat in the pond and in the intermittent stream which serves as the outflow of the pond. 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. 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 (see DWQ website for most current version.). 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. NA Updated 11/1/2005 Page 6 of 9 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 http://www.nceep.net/pa~es/inlieureplace.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): Amount of buffer mitigation requested (square feet): Amount of Riparian wetland mitigation requested (acres): Amount ofNon-riparian wetland mitigation requested (acres): Amount of Coastal wetland mitigation requested (acres): IX. Environmental Documentation (required by DWQ) 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 ^ 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 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. 1. 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 Updated I 1 / 1 /2005 Page 7 of 9 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 multipliers. Zone* Impact (square feet) Multiplier Required Miti ation 1 3 (2 for Catawba) 2 1.5 Total * Zone 1 extends out 30 feet perpendicular from the top of the near bank of channel; Zone 2 extends an additional 20 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. NA 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. This is Hart of a pond and stream restoration proiect: there will be no increase in impervious acrea a as part of the project. XII. Sewage Disposal (required by DWQ) Clearly detail the ultimate treatment methods and disposition (non-discharge or discharge) of wastewater generated from the proposed project, or available capacity of the subject facility. NA XIII. Violations (required by DWQ) Is this site in violation of DWQ Wetland Rules (15A NCAC 2H .0500) or any Buffer Rules? Yes ^ No Is this an after-the-fact permit application? Yes ^ No Updated 11/1/2005 Page 8 of 9 XIV. Cumulative 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 ^ No If yes, please submit a qualitative or quantitative cumulative impact analysis in accordance with the most recent North Carolina Division of Water Quality policy posted on our website at http://h2o.enr.state.nc.us/ncwetlands. If no, please provide a short narrative description: XV. Other Circumstances (Optional): It is the applicant's responsibility to submit the application sufficiently in advance of desired construction dates to allow processing time for these permits. However, an applicant may choose to list constraints associated with construction or sequencing that may impose limits on work schedules (e.g., draw-down schedules for lakes, dates associated with Endangered and Threatened Species, accessibility problems, or other issues outside of the applicant's control). NA Cu-~2~~-- ~l~n~o7 Ap~icant/Agent's Signature Date (Agent's signature is valid only if an authorization letter from the applicant is provided.) Updated 11/1/2005 Page 9 of 9 07 •o~a~ 05-07-02 05-07-01 ~ ~~~ 1 ~ ~ ~ i, - 1 i~ . ; 2 ~ `~ J///~ ~ nl I i. i1 r 1 F~,~ri I ~ ~ North Wil sboro ; ~~~~ ~. I ~ YADKIN ).3-Q7-01 WI li~~ s ~r` -`~ ~, ~•'/ ~ 05-07-03 ~ i rrr ti ~ ~,i i~ ..I~! ~ l ~a-r` f ~ i `~ r`'` YADKIN t~ ~ti .`. ~ 03-07-02 Project Location ~ ~ ~~~ ~ YADKIN l~ 03-07-06 f CATAW BA 03-08-32 I r' r 1 r 1 I r Legend Figure 1.0: Vicinity Map ~~ _ _ ____ Wilkes Community College ~ ~ NCDWQ Sub-basin ' ;Counties Wilkes County, NC }~ :. ~ ~ 0 2s s io is ~J Miles /~ ... 0 7 0 7 0 8 ~~ ~s ~~ rrZ r ~~~ _~- a~ ...~ _~_.. _~r; ref ~'~ ~ 1 i a r ~~4 ~~i i J•~ ~~ ~~_ a ~` a, r~~ - ,.~ . -~1 ,5 ~~~ ` ~ ~ ~tiI . 1h ,, '~.~ ~~ ~ ~ ~~ •...r ~r i 5 `, ~~ a +~fy~ .~ _' r r ~• ~_~ ~ 1 ~• ~ ~~ i ~~ ~+{~ ~~• ~~ a ~'o\~e9` ~f _ •'~ ~~~L '"fi'''r-__ - ' -- i ~~~ ~,''''~~ ~ .~ ~ ti~ ~# ti ~~ k i Le end Figure 2: Watershed Map ~~ g Wilkes Community College Wilkes Pond Existing Streams r ~. ~-: Watershed Wilkes County, NC Pil t VI w, 1 c. t~ ~~~~ # ~~ ~~ 0 200 400 800 1, 200 ~ ~ 3"%g*; ~ L~ J Feet .- f~,'~ ; ~ Y~~z~#>d 07 0 708 BuB -Buncombe loamy sand, 0-8% slopes, occasionally flooded MaC2 -Masada sandy clay loam, 8-15% slopes, eroded PaD -Pacolet sandy loam, 15-25% slopes Uf6 ~ PcC2 -Pacolet sandy clay loam, 8-15% slopes, eroded RnE -Rion fine sandy loam, 25-60% slopes UdC -Udorthents -urban land complex, 1-15% slopes ® UfB -Udorthents -urban land complex,i -6% slopes, rarely flooded W -water WhA - Wehadkee loam, 0-2% slopes, frequently flooded ~' .__~.~~ ~~ ~~, n ",' ,~" ~ .. .,~ a~ RnE - ~~°'1- sN;„;. :~, a~ .~ „ ~~ ~. WhA BuB ~r RnE ~'a PaD L@g@I1C11 Pigum 3.11: Soils flap ~~ , Wilkes Community College 41~~ Wilkes Pond Existing Streams Q Watershed W~~kes County, NC Pil t Vl~w, I~c. ,, z ~ 0 200 400 800 1,200 ~1\ c ~ ~l Feet /-i ' 0 7 0 7 0 8 Wilkes Community College Pond and Stream Restoration Existing Conditions and Design Summary Baker Engineering (Baker) has assembled a preliminary retrofit design for the Wilkes Community College (WCC) wet detention basin located in Wilkesboro, North Carolina (Figure 1). The preliminary design focuses on two things: altering existing storage and outflow hydraulics to improve water quality and creation of varied aquatic habitats to improve ecological and biological function of the pond. The North Carolina Department of Environmental & Natural Resources (NCDENR) regulatory requirements for water quality design of wet detention basins were used as guidelines in achieving these improvements. A second component of the project is the redesign of the outfall channel to natural channel design specifications. Watershed Assessment The existing watershed, which encompasses the WCC campus, was characterized and assessed (Figure 2). A complete field survey of the pond, the adjacent west to east trending ditch, and the surrounding areas was completed. Collection of this data was coupled with site visits, review of aerial imagery, as well as review of nearby gage data and historic precipitation trends. All data was processed through the hydrologic modeling program HEC-HMS. Simulations for the one- inch storm (considered the water quality storm), one, two, ten, and fifty-year storms were conducted. Model results were analyzed to gain a broader understanding of the current hydraulic functions of the pond. Additionally, the data collected from the existing channel was geomorphically analyzed, characterized, and processed through a hydraulic modeling program, HEC-RAS to gain a broader understanding of hydraulic processes occurring in the channel system. Existing Conditions Several problems with the existing pond were noted during preliminary analysis of the data. DENR recommends a minimum wet storage depth of 3 feet in a wet detention basin. Wilkes Pond is currently 1.54 feet deep on average. The existing surface area to drainage area (SA/DA) ratio (a ratio used to determine the total suspended solid (TSS) removal efficiency of a water feature) of the pond is 1.48. This value, when compared to the depth, indicates that the TSS removal is below the target 85% removal efficiency. The permanent pool volume is only 75% of the minimum required by water quality guidelines, and the retention time of the one-inch water quality storm is approximately one third of the minimum required by water quality guidelines. In addition, site visits showed excessive fecal contamination of the pond from native and non-native waterfowl, heavy sedimentation from development activities in the watershed and standing water in pipes which drain to the pond (Photolog). Each of these problems has been addressed in the proposed retrofit design. Proposed Pond Design The proposed pond design lowers the normal water surface elevation from 966.5 ft to 965 ft to allow stormwater pipes to drain fully. A sediment forebay, which encompasses 23% of the overall volume of the pond, is designed at the outlet of pipes which contribute most of the sediment from the watershed. Surface area of the permanent pool is marginally decreased and the average depth is increased to 3.34 feet on average, bringing the SA/DA ratio into the range associated with 85%TSS removal efficiency. Deep water areas ranging up to six feet in depth are proposed. A riser barrel structure is designed with a low flow orifice that retains and slowly releases the water quality storm over 4 days in order to maximize settling of pollutants. An aquatic bench to be planted with aquatic and wetland species is proposed along the perimeter of Wilkes Community College Pond and Stream Restoration Page 1 of 2 Baker Engineering NY, Inc the pond. In addition to providing improved nutrient uptake, increased sedimentation, and diverse ecological and biological habitat, the littoral shelf will act as a shallow safety bench. Modeling A HEC-HMS model supporting all proposed conditions was created. Simulations for the one- inch, one-year, two-year, ten-year, and fifty-year storms were conducted. Dewatering times, while significantly increased for all storm events, were most notably increased for the smaller storm events. The enhanced residence time will improve pollutant removal efficiency of the basin. Discharge from the basin was decreased during all storms as well. The increased storage capacity provided by the new design also attenuates the 50 year storm and releases it through the emergency spillway, while the model predicts that surrounding areas are flooded during 50-year storm events. Proposed Stream Design In coordination with the pond enhancements, the outfall channel from the riser barrel structure has been designed to natural channel design specifications as part of this project. The existing west to east trending ditch is characterized as an incised B6c channel. The proposed restored channel, which is regulated by outflow from the upstream pond, is a priority II C/E channel. A floodplain at an elevation lower than the historic floodplain is provided to alleviate shear stresses during large storm events. This channel meanders through alternating riffle pool sequences several hundred feet downstream before it joins the existing west to east trending ditch. The tie- in point is located approximately 3001inear feet upstream of the ditch's confluence with Moravian Creek, and was selected based on a variety of factors, including preservation of existing trees, channel bottom elevations and the existing location of the walking trail. Wilkes Community College Pond and Stream Restoration Page 2 of 2 Baker Engineering NY, Inc 07 0 X08 Wilkes Community College Pond and Stream Restoration ~ ~ ~, ~ ~ ,} ~~ ~ ~ f 7 ,~x ~ ~ ,k ~ ~ ,' ' ~,. ~ ~-- -~ ~ ~. ~ f ~, ~ r ~~ R ti ~ , . ~ ~- ~ "~ ~ .. ~y a.,, , .. r. ,: ~ ` i r ti; ~'c s ~ i ,~' x ' ., i ~ } ~ s,~ : - .{ .„ it r;f 4.7F~ i~ 9 ~{ ~l s ~~Y- F ~3l. .?ww. _ ._ Photo 6. View of current water control structure (two culverts) -view from the west looking east. Photo 1. From pond embankment looking Photo 2. Waterfowl activity in the pond. View southeast at sediment plume formed below 40" from west embankment looking east. CMP. Photo 4. View of contributing pipe and pond embankment -view from the north looking south. Photo 3. View of pipes outleting to pond -view from north of western and southern embankments. Photo 5. View of stagnant pond outlet channel - view from east looking west. Wilkes Community College Pond and Stream Restoration east. Photo 8. View of Moravian Creek -downstream waterway which receives outflow from Wilkes Community College Pond -view from the south looking north Photo 7. 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