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HomeMy WebLinkAbout20150562 Ver 1_401 Application_20150615Soil & Environmental Consultants, PA 8412 Falls of Neuse Road, Suite 104, Raleigh, NC 27615 • Phone. (919) 846 -5900 • Fax. (919) 846 -9467 sandec corn 2 0 5 0 8 2 UPDATED —June 3, 2015 S &EC Project # 9948 W27 To: US Army Corps of Engineers Raleigh Regulatory Field Office Attn: Andy Williams or James Lastinger 3331 Heritage Trade Drive, Suite 105 Wake Forest, NC 27587 From: Bob Zarzecki Soil & Environmental Consultants, P A. Re: FREEDOM PARKWAY EXTENSION Chatham Park, Pittsboro, Chatham County, NC N.C. Division of Water Resources 401 & Buffer Permitting Unit Attn Karen Higgins Archdale Building — 9ch Floor 512 North Salisbury Street, Raleigh, NC 27604 Copy sent to Cherri S 1�' JUN 04 2015 ' On behalf of the owner, Chatham Park Investors, LLC, please find attached a complete application an Tt information requesting written concurrence from the U.S. Army Corps of Engineers (USACE) and the N. C. Division Water Resources (DWR) that the activities proposed below may proceed under Nationwide Permit 39 and General Water Quality Certification 3890. Please contact me at (919) 846 -5900 if you have any questions or require additional information. PROJECT St IMMARY Project Name FREEDOM PARKWAY EXTENSION Project Type Road to Medical Office Bldg. & Hospice Facility Owner / Applicant Chatham Park Investors, LLC County Chatham Nearest Town Pittsboro Waterbody Name UT to Haven Creek & Haw River Index Number 16- (36.7) Class WS -IV, NSW USGS Cataloging Unit Haw River / Jordan Lake / Cape Fear 03030002 IMPACT SUMMARY Stream Impact (acres): 0.039 acres Wetland Impact (acres): 0 003 acres Total Impact to Waters of the U S (acres) 0 042 acres Total Stream Impact (linear feet). 168 feet* * Note Total stream impacts include 124 ft of permanent loss, 25 ft of permanent impact, but not permanent loss, and 19 feet of temporary impact Attachments: Complete updated PCN & supplemental attachments. DWR Application Fee s+ of W "TEq o� pG Office Use Only Corps action ID no o o c DWQ project no Form Version 1 4 January 2009 Page 1 of 10 PCN Form — Version 1 4 January 2009 Pre - Construction Notification (PCN) Form A. Applicant Information 1. Processing 1 a. Type(s) of approval sought from the Corps ❑X Section 404 Permit ❑ Section 10 Permit 1 b Specify Nationwide Permit (NWP) number 39 or General Permit (GP) number 1 c Has the NWP or GP number been verified by the Corps? ❑X Yes ❑ No 1 d Type(s) of approval sought from the DWQ (check all that apply): ❑X 401 Water Quality Certification — Regular ❑ Non -404 Jurisdictional General Permit ❑ 401 Water Quality Certification — Express ❑ Riparian Buffer Authorization 1 e Is this notification solely for the record because written approval is not required? For the record only for DWQ 401 Certification• ❑ Yes ❑X No For the record only for Corps Permit ❑ Yes ❑X No 1f Is payment into a mitigation bank or in -lieu fee program proposed for mitigation of impacts? If so, attach the acceptance letter from mitigation bank or in -lieu fee program. ❑ Yes ❑X No 1 g Is the project located in any of NC's twenty coastal counties If yes, answer 1 h below. ❑ Yes Q No 1 h. Is the project located within a NC DCM Area of Environmental Concern (AEC)? ❑ Yes ❑X No 2. Project Information 2a. Name of project- Freedom Parkway Extension 2b County Chatham 2c Nearest municipality / town Pittsboro 2d Subdivision name: Chatham Park 2e NCDOT only, T.I.P. or state project no n/a 3. Owner Information 3a Name(s) on Recorded Deed Chatham Park Investors, LLC 3b Deed Book and Page No B1567/P800 3c Responsible Party (for LLC if applicable) Timothy R Smith 3d. Street address 100 Weston Estates Way 3e. City, state, zip: Cary, NC 27513 3f. Telephone no 919 -481 -3000 3g Fax no.* " fax agent 3h Email address* " email agent Page 1 of 10 PCN Form — Version 1 4 January 2009 F 4. Applicant Information (if different from owner) 4a Applicant is ❑ Agent ❑ Other, specify 4b Name. 4c Business name (if applicable) 4d. Street address: 4e. City, state, zip 4f Telephone no. 4g Fax no 4h Email address S. Agent/Consultant Information (if applicable) 5a Name Bob Zarzecki 5b Business name (if applicable) Soil & Environmental Consultants, PA 5c. Street address 8412 Falls of Neuse Road, Suite 104 5d City, state, zip Raleigh, NC 27615 5e. Telephone no 919- 846 -5900 5f Fax no.. 919 - 846 -9467 5g. Email address. bzarzecki @sandec corn Page 2 of 10 B. Project Information and Prior Project History 1. Property Identification 1 a. Property identification no. (tax PIN or parcel ID) 9752 -08 -9484 1 b. Site coordinates (in decimal degrees): Latitude 35 75476 Longitude - 79.16392 1 c. Property size- 40 acres 2. Surface Waters 2a. Name of nearest body of water to proposed project. Haven Creek - Haw River - 16 -(36 7) 2b Water Quality Classification of nearest receiving water WS -IV; NSW 2c River basin- Haw River / Jordan Lake / Cape Fear (03030002) 3. Project Description 3a Describe the existing conditions on the site and the general land use in the vicinity of the project at the time of this application The medical office budding and hospice complex has been cleared, graded and is currently under construction All work to date has been in upland areas The stream, wetlands and buffers at the proposed crossing location are in take and undisturbed The surrounding land use is vacant woodland, rural residential & commercial (fast food, Botangles) The project would result in "minimal tree removal' (< 1 ac of existing trees) 3b List the total estimated acreage of all existing wetlands on the property: 0 25 3c List the total estimated linear feet of all existing streams (intermittent and perennial) on the property 4,300 3d Explain the purpose of the proposed project To construct Freedom Parkway which will be the primary access drive from Russet Run road to the medical office building & hospice facility 3e. Describe the overall project in detail, including the type of equipment to be used Medical office building, hospice facility, Freedom Parkway & Grant Drive, and associated infrastructure and BMPs Heavy, earth - moving equipment 4. Jurisdictional Determinations 4a Have jurisdictional wetland or stream determinations by the Corps or State been requested or obtained for this property / project (including all prior phases) in the past? 0 Yes ❑ No ❑ Unknown Comments 4b. If the Corps made the jurisdictional determination, what type of determination was made? 0 Preliminary ❑ Final 4c. If yes, who delineated the jurisdictional areas? Name (if known) Monte Mathews & James Lastinger / Steven Ball Agency /Consultant Company Other USACE / S &EC 4d If yes, list the dates of the Corps jurisdictional determinations or State determinations and attach documentation Monte Mathews (USAGE) field verified the streams and wetlands as shown on the attached impact exhibits on October 27, 2011 (SAW- 2010 - 00140) The stream at the proposed crossing location was determined to be "perennial' 5. Project History 5a Have permits or certifications been requested or obtained for this project (including all prior phases) in the past? 0 Yes ❑ No ❑ Unknown 5b. If yes, explain in detail according to "help file" instructions Chatham Medical Office Building Sanitary Sewer Extension (PCN submitted 8/15/2014, DWR Approval #14 -0898) = 24 ft temporary impacts 6. Future Project Plans 6a Is this a phased project? 0 Yes ❑ No 6b If yes, explain. This protect is located within the overall Chatham Park approved Planned Development District (PDD) and Master Plan (MP) No additional impacts in this area of Chatham Park are anticipated Additional impacts are anticipated in the remainder of Chatham Park, but are unknown at this time Page 3 of 10 PCN Form — Version 1 4 January 2009 C. Proposed Impacts Inventory 1. Impacts Summary la Which sections were completed below for your project (check all that apply): ❑X Wetlands ❑X Streams — tributaries ❑X Buffers ❑ Open Waters ❑ Pond Construction 2. Wetland Impacts If there are wetland impacts proposed on the site, then complete this question for each wetland area impacted 2a 2b. 2c 2d 2e 2f Wetland impact Type of impact Type of wetland Forested Type of jurisdiction Area of number Corps (404,10) or impact Permanent (P) or DWQ (401, other) (acres) Temporary T W1 Choose one Choose one Yes /No - W2 Choose one Choose one Yes /No W3 T Fill Headwater Wetland Yes Corps 0 003 W4 Choose one Choose one Yes /No W5 Choose one Choose one Yes /No W6 Choose one Choose one Yes /No 2g Total Wetland Impacts: 0 003 2h Comments. This wetland is a very small, linear wetland feature (possible abandoned section of the stream) The project plans avoided permanent impacts to the wetland, but temporary impacts are anticipated to construct the retaining walls The wetlands will be returned to grade and planted with a wetland seed mix The larger wetland (approximately 1/4 acres) to the west was avoided altogether 3. Stream Impacts If there are perennial or intermittent stream impacts (Including temporary impacts) proposed on the site, then complete this question for all stream sites impacted. 3a 3b. 3c 3d 3e. 3f 3g Stream Impact Type of Impact Stream name Perennial (PER) or Type of Average Impact number intermittent (INT)? jurisdiction stream length Permanent (P) or width (linear Temporary (T) (feet) feet) S1 P Culvert UT to Haven Creek PER Corps 10 124 S2 P Stabilization UT to Haven Creek PER Corps 10 25 S3 T Type In (Other) UT to Haven Creek PER Corps 10 19 S4 Choose one S5 Choose one S6 Choose one 3h Total stream and tributary impacts 168 31 Comments Impact "S1" is for the 12'x10' box culvert Impact "S2" is for the downstream energy dissipater pad, which voll be constructed at or below the existing stream bed elevation, and as such Is considered a "permanent Impact ", but not a "permanent loss" Impact "S3" are temporary impacts needed to Install the retaining wall and culvert Any alteration of the channel will be restored to it's original dimensions and no permanent fill will remain As such, the only permanent loss of waters Is the 124 ft of culverted stream Page 4 of 10 PCN Form — Version 1.4 January 2009 rs 4. Open Water Impacts If there are proposed impacts to lakes, ponds, estuaries, tributaries, sounds, the Atlantic Ocean, or any other open water of the U S then indivi ually list all open water impacts below 4a Open water impact number Permanent (P) or Temporary T 4b. Name of waterbody (if applicable) 4c Type of impact 4d Waterbody type 4e. Area of impact (acres) 01 - Choose one Choose 02 - Choose one Choose 03 - Choose one Choose 04 - Choose one Choose 4f Total open water impacts 0 4g Comments: 5. Pond or Lake Construction If pond or lake construction proposed, the complete the chart below 5a. Pond ID number 5b Proposed use or purpose of pond 5c Wetland Impacts (acres) 5d. Stream Impacts (feet) 5e Upland (acres) Flooded Filled Excavated Flooded Filled Excavated P1 Choose one P2 Choose one 5f Total: 0 5g. Comments* 5h. Is a dam high hazard permit required? ❑ Yes ❑ No If yes, permit ID no- 5i Expected pond surface area (acres). 5j. Size of pond watershed (acres) 5k Method of construction: 6. Buffer Impacts (for DWQ) If project will impact a protected riparian buffer, then complete the chart below If yes, then individually list all buffer impacts below If any impacts require mitigation, then vou MUST fill out Section D of this form. 6a. Project is in which protected basin? ❑ Neuse ❑ Tar - Pamlico ❑ Catawba ❑ Randleman ❑ Other* 6b Buffer Impact number — Permanent (P) or Temporary T 6c Reason for impact 6d Stream name 6e Buffer mitigation required? 6f Zone 1 impact (square feet ) 6g. Zone 2 impact (square feet 61 P Road Crossing UT to Haven Creek No 7,588 6,251 B2 T Installation of Disspater UT to Haven Creek No 401 0 B3 - Yes /No B4 T Installation of Crossing UT to Haven Creek No 110 0 B5 Yes /No B6 Yes /No 6h. Total Buffer Impacts: 8,099 6,251 6i Comments Buffer impacts are provided as courtesy to DWR, but will reviewed and approved by the Town of Pittsboro Page 5 of 10 l� D. Impact Justification and Mitigation 1. Avoidance and Minimization 1a Specifically describe measures taken to avoid or minimize the proposed impacts in designing project Significant efforts were made during design The developed avoided all wetlands, streams and buffers with the exception of the road crossing This included the relocation of a proposed stormwater BMP to avoid the +/- 1/4 acre wetland to the northeast The medium was removed from the street plan at the crossing location and retaining walls included to minimize the overall width of the crossing and associated impacts The road crossing is set by the new roundabout intersection on Russet Run road that will provide primary access to both this property and the lands to the north lb Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques. The project will obtain a grading permit including all necessary erosion and sediment control measures to help define the permitted limits, avoid indirect impacts and off site sedimentation, and protect water quality 2. Compensatory Mitigation for Impacts to Waters of the U.S. or Waters of the State 2a. Does the project require Compensatory Mitigation for Impacts to Waters of the U S or Waters of the State? ❑ Yes ❑X No 2b If yes, mitigation is required by (check all that apply) ❑ DWQ ❑ Corps 2c. If yes, which mitigation option will be used for this project? ❑ Mitigation bank ❑ Payment to in -lieu fee program ❑ Permittee Responsible Mitigation 3. Complete if Using a Mitigation Bank 3a. Name of Mitigation Bank: 3b Credits Purchased (attach receipt and letter) Type: Choose one Type: Choose one Type: Choose one Quantity Quantity Quantity 3c Comments: 4. Complete if Making a Payment to In -lieu Fee Program 4a Approval letter from in -lieu fee program is attached. ❑ Yes 4b. Stream mitigation requested, linear feet 4c. If using stream mitigation, stream temperature Choose one 4d. Buffer mitigation requested (DWQ only). square feet 4e. Riparian wetland mitigation requested- acres 4f Non - riparian wetland mitigation requested acres 4g. Coastal (tidal) wetland mitigation requested acres 4h. Comments 5. Complete if Using a Permittee Responsible Mitigation Plan 5a. If using a permittee responsible mitigation plan, provide a description of the proposed mitigation plan. Page 6 of 10 PCN Form — Version 1 4 January 2009 r 6. Buffer Mitigation (State Regulated Riparian Buffer Rules) — required by DWQ 6a. Will the project result in an impact within a protected riparian buffer that requires buffer mitigation? Yes ❑X No 6b. If yes, then identify the square feet of impact to each zone of the riparian buffer that requires mitigation Calculate the amount of mitigation required. Zone 6c. Reason for impact 6d. Total impact (square feet) Multiplier 6e. Required mitigation (square feet) Zone 1 3 (2 for Catawba) Zone 2 1.5 6f. Total buffer mitigation required: 6g. If buffer mitigation is required, discuss what type of mitigation is proposed (e.g., payment to private mitigation bank, permittee responsible riparian buffer restoration, payment into an approved in -lieu fee fund). 6h Comments Page 7 of 10 E. Stormwater Management and Diffuse Flow Plan (required by DWQ) 1. Diffuse Flow Plan 1 a. Does the project include or is it adjacent to protected riparian buffers identified Yes ❑ No within one of the NC Riparian Buffer Protection Rules? lb If yes, then is a diffuse flow plan Included? If no, explain why Because all runoff from the project has been proposed to be treated by devices capable of removing 30% Yes ❑X No of the total nitrogen load, no further measures are needed to meet diffuse flow requirements prior to ❑ discharging the runoff through the stream buffer The Town will review and approve any buffer impacts 2. Stormwater Management Plan 2a What Is the overall percent imperviousness of this project? 55% 2b Does this project require a Stormwater Management Plan? ❑X Yes ❑ No 2c If this project DOES NOT require a Stormwater Management Plan, explain why 2d If this project DOES require a Stormwater Management Plan, then provide a brief, narrative description of the plan The Town of Pittsboro, while not a DWR Certified Local Government is required to review the stormwater management plan under their state - delegated Jordan Lake stormwater associated ordinance(s) and agreements made as part of the Chatham Park PDD /MP The Medical Office Building site and the Hospice site will be reviewed under these programs along with this collector road The Medical Office Budding site is utilizing a bioretention device and the hospice site is using a wet pond We have provided the SMP for the collector road (Freedom Parkway) requiring this requested 401 Certification stream and wetland impact The percent impervious listed above is only for the road and is much less for the entire development The road runoff will be treated by means of "tree wells" and "bioretention" as per the attached stormwater management plan 2e. Who will be responsible for the review of the Stormwater Management Plan? DWR (Freedom Parkway only) 3. Certified Local Government Stormwater Review 3a In which local government's jurisdiction Is this project? ❑ Phase II ❑ NSW 3b Which of the following locally - Implemented stormwater management programs El USMP apply (check all that apply) ❑ Water Supply Watershed ❑ Other 3c Has the approved Stormwater Management Plan with proof of approval been ❑ Yes ❑ No attached? 4. DWQ Stormwater Program Review ElCoastal counties ❑HQW 4a. Which of the following state - Implemented stormwater management programs apply ❑ORW (check all that apply) ❑Session Law 2006 -246 ❑Other 4b Has the approved Stormwater Management Plan with proof of approval been ❑ Yes ❑ No attached? S. DWQ 401 Unit Stormwater Review 5a. Does the Stormwater Management Plan meet the appropriate requirements? ❑X Yes ❑ No 5b. Have all of the 401 Unit submittal requirements been met? X❑ Yes ❑ No Page 8 of 10 PCN Form — Version 1 4 January 2009 1 F. Supplementary Information 1. Environmental Documentation (DWQ Requirement) la Does the project involve an expenditure of public (federal /state /local) funds or the ❑ Yes ❑X No use of public (federal /state) land? lb If you answered "yes" to the above, does the project require preparation of an environmental document pursuant to the requirements of the National or State ❑ Yes ❑ No (North Carolina) Environmental Policy Act (NEPA/SEPA)? 1 c If you answered "yes" to the above, has the document review been finalized by the State Clearing House? (If so, attach a copy of the NEPA or SEPA final approval ❑ Yes ❑ No letter.) Comments: 2. Violations (DWQ Requirement) 2a Is the site in violation of DWQ Wetland Rules (15A NCAC 2H 0500), Isolated Wetland Rules (15A NCAC 2H 1300), DWQ Surface Water or Wetland Standards, ❑ Yes ❑X No or Riparian Buffer Rules (15A NCAC 2B 0200)? 2b Is this an after - the -fact permit application? ❑ Yes ❑X No 2c If you answered "yes" to one or both of the above questions, provide an explanation of the violation(s) 3. Cumulative Impacts (DWQ Requirement) 3a Will this project (based on past and reasonably anticipated future impacts) result in ❑Yes No additional development, which could impact nearby downstream water quality? 3b. If you answered "yes' to the above, submit a qualitative or quantitative cumulative impact analysis in accordance with the most recent DWQ policy If you answered "no," provide a short narrative description. The proposed impacts are for the construction of Freedom Parkway. Freedom Parkway will provide primary access to the medical office budding and hospice facility as well as other future development within the Suttles Tract area of Chatham Park No additional impacts are anticipated within this area All future development will be subject to both State and Town implemented stormwater management regulations per the Jordan Lake stormwater rules and Chatham Park PDD /MP requirements As such, we do not believe that this project will result in any cumulative impacts to waters or water quality 4. Sewage Disposal (DWQ Requirement) 4a. 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 Town Pittsboro The Town DEN This area of Chatham Park will be serviced by the of sanitary sewer system and will ensure adequate capacity Page 9 of 10 PCN Form — Version 1.4 January 2009 5. Endangered Species and Designated Critical Habitat (Corps Requirement) 5a Will this project occur in or near an area with federally protected species or ❑ Yes ❑X No habitat? 5b Have you checked with the USFWS concerning Endangered Species Act ❑ Yes ❑X No impacts? 5c. If yes, indicate the USFWS Field Office you have contacted. - 5d What data sources did you use to determine whether your site would impact Endangered Species or Designated Critical Habitat'7 NHP & FWS databases Cape Fear Shiners are "extant" in the Haw River, but were last recorded in 1992 No shiners have been found in this stream or Chatham Park Riparian buffers are applied to the streams NLEB is officially not recordedAisted in Chatham Co , project has minimal tree removal 6. Essential Fish Habitat (Corps Requirement) 6a WIII this project occur In or near an area designated as essential fish habitat? ❑ Yes ❑X No 6b What data sources did you use to determine whether your site would impact Essential Fish Habitat? EFH website mapper Project is located in the piedmont of NC, well beyond any EFH areas 7. Historic or Prehistoric Cultural Resources (Corps Requirement) 7a Will this project occur in or near an area that the state, federal or tribal governments have designated as having historic or cultural preservation ❑ Yes X❑ No status (e.g., National Historic Trust designation or properties significant in North Carolina history and archaeology)? 7b What data sources did you use to determine whether your site would impact historic or archeological resources? SHPO - HPOWEB mapper and database 8. Flood Zone Designation (Corps Requirement) 8a WIII this project occur in a FEMA - designated 100 -year floodplain? ❑ Yes X❑ No 8b. If yes, explain how project meets FEMA requirements 8c What source(s) did you use to make the floodplain determination? FEMA - NC Flood website and mapper The stream crossing is not within a FEMA - designated 100 -year floodplain crDigitally signed by Bob Zarzecki DN cn =Bob Zarzecki, o =S &EC, PA, Bob Zarzeck'hu= wetlands Department, S &EC, PA Bob Zarzecki emaii=bzarzeclu @sandeccom,c =US ",/—Date 2015 06 03 09 18 22 - 04'00' Updated 6/3/2015 Applicant/Agent's Printed Name Date Applicant/Agent's Signature (Agent's signature is valid only if an authorization letter from the applicant is provided Page 10 of 10 FREEDOM PARKWAY EXTENSION Stream, Wetland & Riparian Buffer Impacts Justification for Impacts The proposed impacts requested to extend Freedom Parkway across the jurisdictional stream, adjacent wetlands and stream buffers are necessary to connect Freedom Parkway to Russet Run road to the north. This connection is will become the primary access to the UNC Hospice facility and medical office building currently under construction. It will also be the primary access to the remainder of the Suttles Tract area of the Chatham Park development as depicted on the attached Conceptual Land Plan — Suttles Tract dated December 2, 2014. It should be noted that only the medical office building and hospice facility are under construction. The remainder of the development is conceptual in nature. No additional impacts to streams, wetlands or buffers are anticipated. A new intersection with a roundabout will be constructed where Freedom Parkway will connect to Russet Run road. The location of this intersection is dictated by its distance from US Highway 15 /501 to the west ( +/- 800 ft). This new intersection will improve current and future traffic flows and provide safe access to properties and developments north and south of Russet Run road. The existing Suttles Road is inadequate to provide this necessary safe, traffic flow, primarily due to the location of its intersection with Russet Run road being too close to the highway ( +/- 310 ft). Connection to Suttles Road will remain however in order to provide multiple access points into the southern development areas, so as to avoid additional stream crossings to the north. Impacts needed for the Freedom Parkway Extension have been significantly minimized. This was accomplished by means of eliminating the traffic medium between the north and south bound lanes at the stream /buffer crossing location. It was minimized further by the use of extensive retaining walls and headwalls at the crossing location. This minimized total permanent stream loss to 124 feet. Water quality will be protected as a stormwater management plan (attached) has been developed specifically for the road. The plan includes both "tree wells" and "bioretention ". This plan is being presented to DWR for review and approval. The surrounding development areas will be subject to the Town of Pittsboro DWR delegated Jordan Lake stormwater ordinance and as required under the Chatham Park PDD /MP. The medical office building is utilizing a bioretention device and the hospice facility is using a wet detention pond. The Town will/has approved the stormwater management plans for these projects as well as any future development projects. The Town of Pittsboro DWR approved stream buffer ordinance only requires 50 -ft buffers on the streams. However, the Chatham Park PDD /MP requires these stream buffers be extended to 100 -ft as shown on the attached plans, providing additional water quality protection. CONCEP7`l1.Al -LAND PLAW CHATHAM caUN", arc bN � �mley> »Horn S'U77LES TRACT December a, 2014 Name: Address: Phone: Raleigh, North Carolina 27614 • ] www.SendEC.com AGENT AUTHORIZATION FORM Consultants, PA 'hone: (919) 846-5900 • Fax: (919) 846-9467 All Blanks To Be Filled In By The Current Landowner Project Name/ Description: Ca i4ao� S &EC Project # �Q 7 • �i� Date: 3© The Department of the Army U.S. Army Corps of Engineers, Wilmington District P.O. Box 1890 Wilmington, NC 28402 Attn: Field Office: Re: Wetlands Related Consulting and Permitting To Whom It May Concern I, the current propgM owner, hereby designate and authorize Soil & Environmental Consultants, PA to act in my behalf as my agent in the processing of permit applications, to furnish upon request sup emental information in support of applications, etc. from this day forward. The ©'4-4 day of This notification supersedes any previous correspondence concerning the agent for this project. NOTICE: This authorization, for liability and professional courtesy reasons, is valid only for government officials to enter the property when accompanied by S &EC staff. You should call S &EC to arrange a site meeting prior to visiting the site. a Print Property Owner's Name CC. Ms. Karen Higgins NCDENR - DWQ WeSCAPe Archdale Building 512 N. Salisbury Street "Floor Raleigh, NC 27604 cc: Mr. Steven Ball Soil & Environmental Consultants, PA SOIL & ENVIRONMENTAL CONSULTANTS, PA — NC Division of Water Resources Tian I Invoice Type Date Reference 31615 05222015b Invoice 05/22/15 DWR Application Fee 9948.W27 1 Date: 5/22/2015 Balance $570.00 ° Check Number: Check Amt: Discount $0.00 25977 25977 $570.00 Pay Amount $570.00 PA- >• r, t F a 5 ,, q G -od ?• pr. f -;� &' ��Id; -4eh. t- Ry•a%i: }�IpSA �• bC�. .2 _' ;M°r 4.ab �r,hY.el .•.yA� �iy}T`'�y^ay „M'�cg1ip•�U�:� �';t x. �`pya��l�'1;yZ��'•//]p F*�eap�,�[e ., pry,A�,,, �4/q�r �p�,!e�:!`y/np�'�e! i ° „:,i�e '�, IP '> ,' SOIL °�ai�.V V•YY YOMpp LYV Y�IVIw,CONS�Y1vTfY�V1° V. P Y' 1 •� ^i i. 'a �� .� S�' jli IS�J ° Fk'P ,4 ' , .`� (ry e„ 'C V'l ,. l' •$rd{” ui_S ,> ire ° a.r . z s ''• �i `",: ;•.<•�,. i1• aid °J *� :jar Itt'.�'RALE1�9,-INORTH-CAF �d38412 FALISiOFfIE�•SiE r»DA9f7% UNll- 27,615 ,' f , , . �t e r e �i;~£' '° ItAI:EIC$'� j #`o- `%;. 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H. Ward Farm 1985 CHO325 Robert Jas Heise 1998 �' Q IF A t.7 CHATHAM VOW r A41 il"- �1 FObr :. g Vr t 11 1:64,199 0 0.5 1 2 mi i� 0 0.75 1.5 3 km Sources. Esri, HERE, DeLorme, USGS, Intermap, increment P Corp., NRCAN, Esri Japan, METI, Esri China (Hong Kong), Esn (Thailand), Tom Tom, Maprrylnde, m OpenStreetMap contrbutors, and the GIS User Commurrry S&EC FLOOD HAZARD INFORMATION NOTES TO USERS SCALE HTTP,/FRlS.NC GOV/FRIS -SWIM NORTH CAROLINA —9752 a�i yl— �'ra'4n"�'s .r• -. �.r••x.�- ,w- .r...er........ r.•... «•..« 0 Is tw PANEL LOCATOR RPFAS 02—wi—FWp�. . ............. 4114 m msMM -- flit WiaRi W)WopwAc MR W dvAl7 1 RB haam. aaiR4m 02/02/07 L a N 0 N Y J\,N S� RUN Ft Bk C 165E RUS WIDTH E - 0 / 1. ' #4 �. BOJANGLO , y'" .009 owl 'r .00, ra e I ®� 000 ' IMPACT MAP f� (SHEET 2) r, Z � J wm, �= F O p N W Jm1 m - EM01111 GRANT DRIVE - ROADWAY BMP EXISTING :(BIORETENTION) WETLANDS HOSPICE BMP ° t ® POND WET ( ) 0001.00 *Opp .i s r •� ` i #2 .o 0 - ams — — — — HOSPICE I I — MEDICAL OFFICE BUILDING i ) BMP (BIORETENTION) I ,. MEDICAL- OFFICE BUILDING Q BMPS (BIORETENTION) Ld W Of � ROADWAY B,MP' (BIORETENTION) � I Revision Date! Designer Scale WecR 1' 200' CHATHAM PARK MEDICAL OFFICE BUILDING & drawn-,By o2 /io /1 °°`e Rro HOSPICE SITE - COLLECTOR ROAD B EXTENSION - - - Checked By Job No. is 2120489.0 TOWN OF PITTSBORO CHATHAM COUNTY _NORTH CAROLINA N W - E S PERMANENT IMPACT SUMMARY SITE 14 M A P IMPACT _BUFFER IMPACT WETLAND IMPACT_ _ ZONE 1 ZONE 2 CHANNEL SF AC SF AC LF SF AC 1 #1 7,588 0.18 6,251 0.15 124 0 0 TOTALS 7,588 0.18 1 6,251 0.15 1 124 0 0 TEMPORARY IMPACT SUMMARY A P I IMPACT BUFFER IMPACT WETLAND IMPACT ZONE 1 ZONE 2 CHANNEL SF AC SF AC LF SF AC 1 #2 401 0.009 0 0 25 0 0 1 43 0 0 0 0 0 117 0.003 1 #4 110 0.003 0 0 1 19 0 0 TOTALS 1 511 -0.0121 0 0 1 44 117 0.003 OVERALL WETLAND, STREAM, AND RIPARIAN BUFFER IMPACT MAP GRAPHIC SCALE 1" =200' 0 200 400 600 WITHERS &— RAVENEL [NfINEERS 1 PLANNERS 1 SURVEYORS 335 MacKenan Drive Cary, North Carolina 27511 34 tel: 919 -469 -30 www.withereravenal.con License No. C -0832 Sheet No. 1of4 • _ - - - --L� - :_�1 - ". .�� / \ R � ♦ � `// r rr i ' r',' 'i�r '. 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Designer """ �''=°°' CHATHAM PARK MEDICAL OFFICE BUILDING & WITHERS 6i(' RAVENEL Date Drawn HOSPICE SITE •COLLECTOR ROAD B EXTENSION WETLAND, STREAM, AND RIPARIAN �II.INSIRS 1 ILAMMOIf 1 ,ulll,.rolls �° °� " °'' BUFFER IMPACT MAP 2 of 4 Cheokad BY Job No 11x1 NaeKMen Orivs Cary. North Carolina 27SSi ici 2120469. TOWN OF PfTiSBORO CHATHAM COUNTY NORTH CAROUNA tel: e19-409-3W n+m.lfithererevenel.can License N°. C --QW y en IN i + Ln Ln o Ln o Ln o LIM Q r 4 v : C) LLJ N LL- 0 CL J W 2 O + W Z O 0 m D oC 0 o � o O V W J O V LO 0 Ln Ln ,W o dam' ;o �6 { ! f W i iij j yf m J Ir 1 409 z xx Lau! 1 f_ .. _ u�-. -. ! • ! a.. 1r. l L�, :PanUI Cie J I ; Q Z :ZI , i JI i I I { I ) I Ln o Ln o Ln o LIM Q r 4 v : C) LLJ N LL- 0 CL J W 2 O + W Z O 0 m D oC 0 o � o O V W J O V LO 0 Ln Ln LIM l o dam' ;o ! W Cie Q Z :ZI , I -Z Li = ip : PAUI IWW i�m���'ii�'L'� CLOD j { V LLJ • + I ' I V M - N- - N - r o - C -- ch to -N ■ N m W° ,m r � O � � L gy J e w � u r = m m U � ■ c W" r m = Y V I W I J + U- 0 I � W V Q I o O �C cc v0 z m W Li. 0 O Ckg J pd U I YV W W ad V1 V= O � a o � 0 0 Z'N 1111111111 111 0111111 1 rn $' � � v SMOA3NlfiS W S213NNV1d 'S2IDNI0N3 "13N3Atl2! V S83NllM Wd05:Z1 =5 SIOZ 'OZ qBj pj cud'N91S30 OVO!! 2l0103T1M— uDId \OYJ \J91Aes Tod WWW43 — U01-Jd- 6940Zt \0916 —Z1 -N ■ N m W° ,m r � O � � L gy J e w � u r = m m U � ■ c W" r m = Y V I W I J + U- 0 I � W V Q I o O �C cc v0 z m W Li. 0 O Ckg J pd U I YV W W ad V1 V= O � a o � 0 0 Z'N 1111111111 111 0111111 1 rn $' � � v SMOA3NlfiS W S213NNV1d 'S2IDNI0N3 "13N3Atl2! V S83NllM Wd05:Z1 =5 SIOZ 'OZ qBj pj cud'N91S30 OVO!! 2l0103T1M— uDId \OYJ \J91Aes Tod WWW43 — U01-Jd- 6940Zt \0916 —Z1 Z'N 1111111111 111 0111111 1 rn $' � � v SMOA3NlfiS W S213NNV1d 'S2IDNI0N3 "13N3Atl2! V S83NllM Wd05:Z1 =5 SIOZ 'OZ qBj pj cud'N91S30 OVO!! 2l0103T1M— uDId \OYJ \J91Aes Tod WWW43 — U01-Jd- 6940Zt \0916 —Z1 W0THE:R8 RAVFE NEL ENGINEERS I PLANNERS I SURVEYORS MEMORANDUM TO: NCDENR - DWR FROM: Hunter Freeman, PE CC: file DATE: February 24, 2015 SUBJECT: Chatham Park — Collector Road Stormwater Management i J'/4: •.tic �- The Chatham Park Collector Road is a roadway project within the Chatham Park zoning district of Pittsboro, NC. The project is using a combination of innovative green street designs and conventional stormwater management techniques to provide water quality and quality controls. This memo summarizes the design features and compliance with the Chatham Park Master Plan. Stormwater Management and Green Streets The roadway corridor is located north of the 15 -501 & US -64 bypass interchange, east of Suttles Road. The roadway sits on a ridgeline running from north to south. The majority of the roadway drains to the north into an unnamed tributary of the Haw River. A small portion of the roadway drains to the south to an existing drainage system built as part of previous roadway improvements. The southern portion of the roadway profile contains flatter slopes, and green street technologies have been used in this area. In the northern portion of the road, roadway slopes approach 10 %, making green streets unfeasible, and the drainage system empties into a proposed bioretention cell on the east side of the roadway. The green street design utilizes 8' wide by 34' long tree wells. The tree wells are landscaped areas located between the roadway curb and the sidewalk. The planting surface is depressed below the roadway elevation, allowing roadway and sidewalk runoff to flow into the landscaped area. The planting mix is an engineered soil designed to quickly infiltrate runoff into the media layer. The system is drained via perforated pipes under the planting media. A small cleanout/riser is also included handle larger storms. The tree well is surrounded by concrete curbs on all sides. The systems are designed to continuously control and treat runoff from storm intensities of 1 " /hr or smaller. The total volume treated for storms less of than 1 " /hr intensities exceeds 1" depth design storm treatment volume. A portion of the road drains to a bioretention cell designed in accordance with current standards outlined in the BMP manual. 115 MacKenan Drive I Cary, NC 275111 tel.: 919.469.3340 1 fax: 919.467.6008 I www.withersravenel.com I License No. C -0832 1410 Commonwealth Drive I Suite lol I Wilmington, NC 28403 1 tel: 910.256.92771 fax: 910.256.2584 7nii Alhvrt Pirk Rnari Siiita f; I f;raanchnrn Nf »i,no I tPl• Q�F hnc znno I fax- oio i.F7 rnnR The total drainage area flowing north to the unnamed tributary of the Haw River is 1.45 acres Q 55% impervious. The tree wells at the low point of the road accept runoff from 0.41 acres (0.21 impervious acres) with the remaining roadway draining directly to the bioretention cell or additional tree wells at station 20 +00. The Hospice site area is included in a report submitted by Kimley -Horn Associates. _Diffuse Flow Because all runoff from the project has been treated by devices capable of removing 30% of the total nitrogen load, no further measures are needed to meet diffuse flow requirements prior to discharging the runoff through the stream buffer. t 115 MacKenan Drive Cary, North Carolina 27511 tel.919.469.3340 fax:919.467.6008 www.withersravene1.com BACKGROUND INFORMATION Chatham Park Collector Road W &R Project 02120469 Prelim 5tormwater Management Report February 2015 SCALE 1 6000 D 1000 FEET Approximate Project Location Shown in Rad 079 1666666° W Z z —tee r ,- • �. ,. M M 0 J . A i M r� 10 rr 1r 0 f r c - c air ,—�� - -�•_1, / ! � 0o High School.Road � �i/'•► � � � _�� rt ..rte . + f) JrI f �O 1i 2 'A r r' f , L - f' r -✓ Z o a o ° - ° o ° - g t a C%S. • Ile ,• r t .�Y ays t r 079 166 'Co 2008 To 2006 2014 T T ` 666' W SCALE 1 6000 D 1000 FEET Approximate Project Location Shown in Rad 35^ 45 20" N 35° 45' T' N 3 Hydrologic Soil Group — Chatham County, North Carolina (Chatham Park Collector Road) 665870 665920 665970 666020 666070 3 iN Map Scale: 1:2,010 X panted on A portrait (8. S" x 111116-t -Mc4as N 0 25 50 100 150 fied 0 so 100 200 300 Map pm)edm: Web Mwtator Correa mordinaWs: WGS84 Edge firs: UTM Zane 17N WG584 uSDA Natural Resources Web Soil Survey Conservation Service National Cooperative Soil Survey 35° 49 20'N R R R 35° 4s r N 666110 6661/U i M A 12/31/2014 Page 1 of 4 Hydrologic Soil Group — Chatham County, North Carolina Hydrologic Soil Group Chatham Park Collector Road GaC Georgeville sill loam, 6 to B 10 percent slopes GeB2 Georgeville silty day B loam, 2 to 6 percent slopes, moderately eroded GkD Georgeville -Badin B complex, 10 to 15 percent slopes Totals for Area of Interest C.6 2.7 2.7 7.8 10.3% 35.2% 35.1% 100.0% Natural Resources Web Soil Survey 12/31/2014 Conservation Service National Cooperative Soil Survey Page 3 of 4 \ { \ { k CL 3 ,as 16 a k _ a_ _ «.Sll4a � h §/ � ID� �ƒ (k 0 & ! � ® � ) \ � @ � ! & $ \ @ 2 � 2 )� § $ � ¥ � t § $ s $ §§ ¢ z z2 ¢ e_ «_ m_ «_ _ _« W_ _ff ..9G,6 A ( � I Depth to Water Table -- Chatham County, No th Carolina IMAP LEGEND Area of Interest (A01) Area of Interest (A01) Soils Soil Rating Polygons 0 -25 25 -50 50 -100 Q 100 - 150 150-200 > 200 Not rated or not available Soil Rating Lines .-✓ 0-25 w 25 -50 • 50 -100 �. 100 -150 .v 150-200 r�I > 200 r r Not rated or not available Soil Rating Points 0 -25 25 -50 0 50-100 100 - 150 150-200 -200 Natural Resources Conservation Service 0 Not rated or not available Water Features Streams and Canals Transportation r� r Rails -•.,o Interstate H ghways US Routes Major Road Local Road!: Background . Aeral Photrgraphy Web Soil Survey Nat onal Cooperative Soil Survey MAP INFORMATION The soil surveys +hat comprise your AOI were mapped at 1.24,000 Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: htip : / /websoilsurvey.nres.usda.gov Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projector, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal -area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA -NRCS certified data as of the version date(s) listed below. Soil Survey Area Chatham County, North Carolina Survey Area Data. Version 17, Sep 9, 2014 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Feb 11, 2011--Apr2, 2011 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. 212412015 Page 2 of 3 Depth to Water Table -- Chatham County, North Carolina Depth to Water Table Description "Water table" refers to a saturated zone in the soil. It occurs during specified months. Estimates of the upper limit are based mainly on observations of the water table at selected sites and on evidence of a saturated zone, namely grayish colors (redoximorphic features) in the soil. A saturated zone that lasts for less than a month is not considered a water table. This attribute is actually recorded as three separate values in the database. A low value and a high value indicate the range of this attribute for the soil component. A "representative" value indicates the expected value of this attribute for the component. For this soil property, only the representative value is used. Rating Options Units of Measure: centimeters Aggregation Method: Dominant Component Component Percent Cutoff: None Specked Tie -break Rule: Lower Interpret Nulls as Zero: No Beginning Month: January Ending Month: December USDA Natural Resources Web Soil Survey 2/24/2015 �, Conservation Service National Cooperative Sqil Survey Page 3 of 3 Qepth to Water Table— Summary by Map Unit— Chatham County, North Carolina (NC037) Map.unk symbol ^ ( Map ur+lt name Rating (ca`ntlmete►s) Acres In AOI percent of A6 r ChA Chewacla and 38 3.9 35.9% Wehadkee soils, 0 to 2 percent slopes, frequently flooded GaC Georgeville silt loam, 8 to >200 4.8 42.3% 10 percent slopes GkD Georgeville -Badin >200 2:3 20.8% complex, 10 to 15 percent slopes GkE Georgaville -Badin >200 0.1 1.0% complex, 15 to 30 percent slopes Totals for Area of Interest 10.9 100.0% Description "Water table" refers to a saturated zone in the soil. It occurs during specified months. Estimates of the upper limit are based mainly on observations of the water table at selected sites and on evidence of a saturated zone, namely grayish colors (redoximorphic features) in the soil. A saturated zone that lasts for less than a month is not considered a water table. This attribute is actually recorded as three separate values in the database. A low value and a high value indicate the range of this attribute for the soil component. A "representative" value indicates the expected value of this attribute for the component. For this soil property, only the representative value is used. Rating Options Units of Measure: centimeters Aggregation Method: Dominant Component Component Percent Cutoff: None Specked Tie -break Rule: Lower Interpret Nulls as Zero: No Beginning Month: January Ending Month: December USDA Natural Resources Web Soil Survey 2/24/2015 �, Conservation Service National Cooperative Sqil Survey Page 3 of 3 Water Features--Continued Water I Pond big Flooding Map symbol and soil name 1HYdro--1 Ilogic group surface I runoff I Month I Upper I Lower Isurfacel Duration it limit I water I I. -- - -1 depth-.I lFrequency I I Duration I I Frequency I Ft Ft Ft GaB: 11 Georgeville --------------- LOW Tan-Dec None None GaC: Georgeville ---------------- Medium IJan -Dec None I I None GbB, GbC: Georgaville --------------- B l Medium (January None None (FebrFebruary uary None None None None None None Imay 7 None None IJune None None IJuly None None (August None None September I'October No N o.. N.n: 1 None (November 1. 1 None , None �i)ecember 'I None None GeB2: Georgevills, moderately Bj I LOW Jan-Dec None None GaC2: Georgeville, moderately eroded- 13, I Medium lian-Dec None None GhH2, GhC2: ge-ville, moderately G:1r1rded ................ B I Medium 1 1 ! lian-Dec - -- IV - =- r =__ -__ ( None None GkD- E George-ville --------------- B I medium (, I i` ( I IJan-Dec None IV None B medium .,)Jan -Dec None I' None 0 =r W 3 0 Z O Water Featurea-Continued Map symbol jHydro- Surface 1! Month I Water table I. ,PcndajW Flooding 1., Upper- Lower- 1-:-Sur-f-ace, Durat3.on '] Frequency I Duration 1, Frequency and soil name 1:10gic runoff 11 1 limit I limit Ii water I I' $eyih 111111] Ft Ft Ft CcB: Carbonton ------------ C very high I 11NOV-May :11.0- 2.0,11.5- 3.51,. None L A:'Ju­-()ct 1 .1 1" None Non Brickhaven ---------------- C Low 1) F :I'Nov-Apr 1,1.5-3.0 2.5-4.01. None None I I May-Oct None None Ccc: : Carbonton ----------------- I C I very high 1,!. 1 'ji4ov-May �11.0 -2.01 1.5- 3.5i1(, .5-3.5;11 7:!� None None j'Jun-Oct I*. None None Brickhaven ---------------- I C I Medium I., A INov-May Il.5-3.0 2.5-4.01, 1 7­ '1 None 'I None jJun-Oct 'I' -- -I . 11. I - ] None None CcD: T Carbonton ----------------- C I very high INcv-May 1. 0 -2.0 1. 5 - 3. 51' None None Jun-Oct None None Brickhaven ---------------- C I Medium I 'INov-Apr ,11.1.5 - 3.012.5 -4 DI 1, Noae I 114ay-Oct _ -- None None CeB- Cecil --------------------- B I Low 'A I' 'Pan-Dec �'I: None ­Z 1 None cec, Cen'. I Cecil --------------------- B Medium ,IJan-Dec J� None None ChA: Chewacla ------------------ C 1 Very high -IDec-Mar 10:5 -2,.01 >6-0 I None Brief Frequent April .11.0-2:7 6.0 None 1 Brief I Frequent I I Imay 11.5-4. -.0 >6.0 None Brief I, Frequent 'I June 14.0-5-.0 >610 None 1 Brief Frequent October None =;_ November 11 A - 2" >15.0 None 1 Brief I Frequent 0 zr SD 3 0 0 C Z; R =r 0 SD O 35° 49 20' N 35° 45 13' N Saturated Hydraulic Conductivity (Ksaty- Chatham County, North Carolina 3 � k 665790 665820 665650 665880 669910 669940 665970 3 mKVSmle:1:1,580Irp**edonA kv (11 ^x851S>eeL Mew N 0 20 40 80 120 A0 50 100 200 di Map Wojam: Web P7amh7r Cam WGS54 Edge tics: UTM Zom 17N WG584 uSDe Natural Resources Web Soil Survey Conservation Service National Cooperative Soil Survey 3S 4S 2W O 35° 451r N 666000 666030 666060 666070 6661M 3 to 2/24/2015 Page 1 of 4 Saturated Hydraulic Conductivity (Ksat)— Chatham County, North Carolina MAP LEGEND MAP INFORMATION Area c f Interest (A01) The soil surveys that comprise your AOI were mapped at 1:24,000. Area of Interest (AOI) Warning: Soil Map may not be valid at this scale. Solls Soil Rating Polygons Enlargement of maps beyond the scale of mapping can cause �A = 9.0000 misunderstanding of the detail of mapping and accuracy of soil line I placement. The maps do not show the small areas of contrasting _] Not rated or not available soils that could have been shown at a more detailed scale. Soil Rating Lines Please rely on the bar scale on each map sheet for map rr = 9.0000 measurements. + r Not rateo or not available Source of Map: Natural Resources Conservation Service Soil Rating Points Web Soil Survey URL: http : / /websoilsurvey.nres.usda.gov 11 -9.()000 Coordinate System: Web Mercator (EPSG:3857) 13 Not ratec or not available Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts Water Features distance and area. A projection that preserves area, such as the Streams and Canals Albers equal -area conic projection, should be used if more accurate calculations of distance or area are required. Transportation Rails This product is generated from the USDA -NRCS certified data as of the version date(s) listed below. Interstate Highways Soil Survey Area: Chatham County, North Carolina US Routes Survey Area Data: Version 17, Sep 9, 2014 Major Roads Soil map units are labeled (as space allows) for map scales 1:50,000 Local Roaas or larger. Background Date(s) aerial images were photographed: Feb 11, 2011 —Apr 2, . Aerial Photography 2011 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a resuR, some minor shifting of map unit boundaries may be evident. USDA Natural Resources Web Soil Survey 2/2412015 iillillill Conservation Service National Cooperative Soil Survey Page 2 of 4 Saturated Hydraulic Conductivity (Ksat}— Chatham County, North Carolina Saturated Hydraulic Conductivity (Ksat) Segiiraied Hydraulic Conductivtty (Ksat)— Summary by Map Unit -- Chatham County, North Carolina (NC037) Map unit synttiol Map unit name Rating (micrometers _A7 cres in AOI Percent of AOI '1 W second) percent slopes, ChA Chewacla and 9.0000 3.9 35.9% Wehadkee soils, 0 to 2 percent slopes, frequently flooded GaC Georgeville silt loam, 6 to 9.0000 4.6 42.3% 10 percent slopes GkD Georgeville -Badin 9.0000 2.3 20.8% complex, 10 to 15 percent slopes GkE _ Georgeville -Badin 9.0000 0:1 1.0% complex, 15 to 30 percent slopes Totals for Area of Interest 10.9 100.0% Description Saturated hydraulic conductivity (Ksat) refers to the ease with which pores in a saturated soil transmit water. The estimates are expressed in terms of micrometers per second. They are based on soil characteristics observed in the field, particularly structure, porosity, and texture. Saturated hydraulic conductivity is considered in the design of soil drainage systems and septic tank absorption fields. For each soil layer, this attribute is actually recorded as three separate values in the database. A low value and a high value indicate the range of this attribute for the soil component. A "representative" value indicates the expected value of this attribute for the component. For this soil property, only the representative value is used. The numeric Ksat values have been grouped according to standard Ksat class limits. Rating Options Units of Measure: micrometers per second Aggregation Method: Dominant Component Component Percent Cutoff: None Specified Tie -break Rule: Fastest Interpret Nulls as Zero: No Layer Options (Horizon Aggregation Method): Depth Range (Weighted Average) Top Depth: 2 usDA Natural Resources Web Soil Survey 2124/2015 Conservation Service National Cooperative Soil Survey Page 3 of 4 Saturated Hydraulic Conductivity (Ksat}— Chatham County, North Carolina Bottom Depth: 6 Units of Measure: Centimeters Natural Resources Web Soil Survey 2/24/2015 Conservation Service National Cooperative Soil Survey Page 4 of 4 BMP SIZING CALCULATIONS Chatham Park Collector Road W &R Project 02120469 Prelim Stormwater Management Report February 2015 Project Name: Chatham Park Collector Road City /State: Pittsboro, NC BIORETENTION 1 Land Use Area (ac) % IA Imp. Area (ac) Impervious %( Q?6Ul4 4 1 100 0.60 Open Space 0.44 11 0 0_.00- Totalsi`?01; l 0.60 "Note: Note: Area draining to tree wells at 20 +00 not included in water quality sizing, but is included in routing. Total drainage area — 1.45 ac with 0.80 acres impervious area. Total % Impervious Surface Area = - 57.7 Project #: 2120469 Date: 31- Dec -14 1- Inch - Runoff Volume Calculation. Using the runoff volume calculations in the "Simple Method" as described by Schueler (1987) Rv = 0.05 + 0.009(1) where, Rv = Runoff coefficient, inJin. = Percent impervious Rv = 0.57 in. /in. Total runoff volume from 1 -inch precipitation: Runoff volume, S ,= (Design rainfall) (Rv) (Drainage Area) S =, acre -ft 2149 cu. ft. Recommended Bottom SA = 2149 sq. ft. Planting Surface Provided= 2301 sq. ft. Elevation= 426.75 ft. WQ Elevation = 427.75 ft. WQ Volume Provided = 0.05 ac -ft WQ Volume Provided = 2178 cu. Ft. WQ Volume Required = 2149 cu. Ft. OK Project Name: Chatham Park Collector Road City/State: Pittsboro, NC STORMWATER,BMP 1 - Bioretentlon Cell BIORETENTION UNDERDRAIN SIZING From BMP Manual Chapter 5.7 D = diameter of underdrain Q = underdrain design flow (= 1 Ox filter media flowrate) n = roughness factor S = slope of underdrains D 16 Bioretentlon Surface Area = 2301 sf Media Infiltration Rate =1" °,din /hr Media Flow Rate = ' 0.053 cfs Q (10X media flowrate) = 0.53 cfs n S ° Err,", 006? ,, ftlR D (recommended) = 6.29 In If D Is less -than: i # 4r Pipes ifDIls'less than: # 6" Pi es _ 5.13 2 -7.84- -- r 'IL — 2 - - 5.95 1 3 9.11 1' 3 6.66_ 4 _ _ -1013 '5 7.75- 6 BIORETENTION DRAWDOWN CALCULATIONS Media Flow Rate = 0.053 cfs "limiting factor Media Infiltration Rate = 1 in /hr Volume of Water Drained in 12 hours: 2301 d Volume of Water Drained in 48 hours: 9204 d Bioretention Surface Area = 2301 sf Max ponding Depth = = ;vrk:, =; in Volume above soil = 2178 cf Volume of Water Drained in 12 hours > Volume stored above soil, therefore water will drain into soil within 12 hours Bioretentlon Surface Area = 2301 sf Max ponding Depth = 12 -in Volume above soil = 2178 cf Depth of Soil , $��sC) in Void Ratio 1 a. %KV i Volume of Water in Soil = 1840.8 cf Total Volume to be drained = 4018.8 cf Volume of Water Drained in 48 hours: 9204 cf Pro ec : 2120469 Date:,; 31- Dec -14 (volume above soil + volume in soil) Volume of Water Drained in 48 hours > Total Volume, therefore water will drain +24" into soil within 48 hours Project, Chatham Park Collector - 20+00 Project #: W &R Project #: 2120469.00 BMP Location /Name: 20 +00 (One Side) Date: Dec. 31, 2014 Designed By: — HCF BMP - HIGH FLOW MEDIA_ CALCULATIONS Storm Frequency: = 2 years Duration per Time Step 012 min'; Storm Duration: i` 60 min ' I Rainfall Intensity "1072 Ili /h`r' Drainage Area 9000 sf % Impervious _ W% Impervious Area i 4500 sf iI BMP Storage Area 263 sf First Flush -1" Passed Surface Storage Depth .0 1.25 ft, Surface Storage Volume R 66 H Total Rainfall Treated 1.72 %of Total Storm Volume Media Area 263.0 sf Infiltration Rate 11—W:00 in%hr' KI System sized to-control and treat roadway runoff during a t "ihr event Project: Chatham Park Collector - 20+00 Project #: W&R Project #: 2120469.00 —= BMP Location/Name: 20+00 (One Side) Date, Dec. 31, 2014 Designed By. ` HCF II BMP - HIGH FLOW MEDIA CALCULATIONS Storm Frequency: 1- -2— Y6aij Duration per Time Step min Storm Duration: --30 -min Rainfall Intensity Drainage Area f.- -- r.9000 sf- %Impervious •3D% Impervious Area J4500 sf BMP Storage Area 263 sf First Flush . V. Surface Storage Depth 025 if Surface Storage Volume I Total Rainfall Treated 1.192" 1 % of Total Storm volume -87% —It Media Area if Infiltration Rate I—.. - - - - — -- - -- - - System -sized - ntrol, airi0reat roadway, runoff -,during. a -111hr*event ,-Ystem sized to B I O RETENTI O N SUPPLEMENT FORM Chatham Park Collector Road W &R Project 02120469 Prelim Stormwater Management Report February 2015 Permit Number. Ito be orovided by DWQ) �OF -10 ALeo 0. Ana y NCDENR� STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM BIORETENTION CELL SUPPLEMENT This form must be filled out, printed and submitted. The Required Items Checklist (Part Ill) must be printed, filled out and submitted along with all of the required information. t... I PJR JECT�INF5,ORfVI�l1TI0NF' Project name Chatham Park - Collector Road Contact name Hunter Freeman Phone number '919469 -3340 Date Drainage area number II( DESIGN INQCi.B ATION? Site Characteristics Drainage area Impervious area Percent impervious Design rainfall depth Peak Flow Calculations -43-;5021e .26;136.•02. 60.1% % 1.0 inch Is pre/post control of the 1 -yr, 24 -hr peak flow required? Y _ (Y or N) 1 -yr, 24-hr runoff depth - 31 in 1 -yr, 24 -hr intensity °0:125 irtlhr Pre-development 1 -yr, 24 -hr peak flow 1.050, f1e /sec. Post - development 1 -yr, 24 -hr peak flow 11000;(13 /sec Pre /Post 1 -yr, 24-hr peak control -0.050 ft3 /sec Storage Volume: Non-SA Waters Minimum volume required ;2;149:0 ft3 OK Volume provided _ . `2;179:0:ft3 OK Storage Volume: SA Waters 36 hr 1.5' runoff volume _ _ to Pre - development 1 -yr, 24 -hr runoff -,1.20 in/hr OK Post development 1-yr, 24 -hr runoff Minimum volume required 0 ft3 OK Volume provided ff3 Cell Dimensions 88%, OK Ponding depth of water 12 Inches OK Ponding depth gf water 1.00 it Surface area of the top of the bioretention cell 1000:04 OK Length: 80 ft OK Width: _ 735',ft OK -or- Radius ft Media and Soils Summary Drawdown time, ponded volume 12 hr OK Drawdown time, to 24 inches below surface '24�-hr OK Drawdown time, total: 36 hr In -situ soil: Soil permeability -,1.20 in/hr OK Planting media soil: Soil permeability 1.00,in/hr OK Soil composition % Sand (by volume) 88%, OK % Fines (by volume) 8 %}• OK '-' 028%2 Form SW401- Bioreten0on -Rev.8 June 25, 2010 Parts I and II. Design Summary, Page 1 of 4 Y„ % Organic (by volume) Phosphorus Index (P- Index) of media Form SW401- Bloretention -Rev.8 June 25, 2010 4% OK Tolal: 100% 10 (unitless) OK Permit Number: (to be provided by DWQ) Parts I and II. Design Summary, Page 2 of 4 Basin Elevations ' Temporary pool elevation 427.60 fmsl Type of bioretention cell (answer "Y" to only one of the two following questions): Is this a grassed cell? __ __N .,(Y ,(Y or N) Is this a cell with trees/shrubs? Y -. _ — _ (Y or N) Planting elevation (top of the mulch or grass sod layer) 426.6 fmsi Depth of mulch 2 inches Bottom of the planting media soil 423.42_ imsl Planting media depth _ 3.18_it Depth of washed sand below planting media soil _ 0.33,ff Are underdrains being installed? Y (Y or N) How many clean out pipes are being installed? _ 4. What factor of safety is used for sizing the underdrains? (See 10 BMP Manual Section 12.3.6) Additional distance between the bottom of the planting media and 1 it the bottom of the cell to account for underdrains Bottom of the cell required 422:09;tm §i SHWT elevation �_ 419;fmsl Distance from bottom to SHWT z 3.09 ft Internal Water Storage Zone (IWS) Does the design include IWS Y (Y or N) Elevation of the top of the upturned elbow fmsl Separation of IWS and Surface 426.6 it Planting Plan Number of tree species __ _ _ 1- Number of shrub species Number of herbaceous groundcover species _ _ - _ 0_ Additional Information Does volume in excess of the design volume bypass the Y ' (Y or N) bloretention cell? Does volume in excess of the design volume flow evenly distributed Y (Y or N) through a vegetated filter? What is the length of the vegetated filter? 50 ff Does the design use a level spreader to evenly distribute flow? N; (Y or N) Is the BMP located at least 30 feet from surface waters (50 feet if Y (Y or N) SA waters)? Is the BMP located at least 100 feet from water supply wells? . Y . - (Y or N) Are the vegetated side slopes equal to or less than 3:1? Y� ` l (Y or N) Is the BMP located in a proposed drainage easement with access ' Y (Y or N) to a public Right of Way (ROW)? Inlet velocity (from treatment system) 2 fl/sec Is the area surrounding the cell likely to undergo development in the N (Y or N) future? Are the slopes draining to the bloretention cell greater than 20 %? N (Y or N) Is the drainage area permanently stabilized? Y (Y or N) Pretreatment Used (Indicate Type Used with an 7' in the shaded cell) Gravel and grass (81inches gravel followed by 3 -5 It of grass) Grassed swale Forebay :x Other Form SW401- Bioretention -Rev.8 June 25, 2010 Permil'Number- (to be provided by DWQ) OK media depth OK OK M M OK OK OK Show how flow is evenly distributed. OK OK OK OK Insufficient inlet velocity unless energy dissipating devices are being used. OK OK OK OK Parts I and II. Design Summary, Page 3 of 4 Permit No, (to be assigned by DWQ) Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a requirement has not been met, attach justification. Page! Plan, Sh t'No. J' .4' .li 1 0 Plans (1" - 50' or larger) of the entire site showing. Design at ultimate build -out, Off -site drainage (it applicable), Delineated drainage basins (include Rational C coefficient per basin), Cell dimensions, Pretreatment system, High flow bypass system, Maintenance access, Recorded drainage easement and public right of way (ROW), Clean out pipe locations, Overflow device, and Boundaries of drainage easement. 2. Plan details (1" = 30' or larger) for the bioretention cell showing: - Cell dimensions Pretreatment system, High flow bypass system, Maintenance access, Recorded drainage easement and public right of way (ROW), Deslgn at ultimate build -out, Off -site drainage (if applicable), Clean out pipe locations, Overflow device, and Boundaries of drainage easement. Indicate the P -Index between 10 and 30 3. Section view of the bioretentlon cell (1" = 20' or larger) showing: - Side slopes, 3:1 or lower Underdrain system (if applicable), and Bioretention cell layers [ground level and slope, pre- treatment, ponding depth, mulch depth, fill media depth, washed sand, filter fabric (or choking stone if applicable), #57 stone, underdrains (if applicable), SHWT level(s), and overflow structure) 4. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. The results of the soils report must be verified in the field by DWO, by completing & submitting the soils investigation request form. County soil maps are not an acceptable source of soils information. All elevations shall be in feet mean sea level (fmsl). Results of soils tests of both the planting soil and the in situ soil must include: , 6D -Sa� n'� -Soil permeability, NDtJO `�{ili Soil composition (% sand, % tines, % organic), and Q►t P- index. 5. A detailed planting plan (1' = 20' or larger) prepared by a qualified individual showing: A variety of suitable species, Sizes, spacing and locations of plantings, Total quantity of each type of plant specified, A planting detail, The source nursery for the plants, and Fertilizer and watering requirements to establish vegetation. 6. A construction sequence that shows how the bioretention cell will be protected from sediment until the entire drainage area is stabilized. 7. The supporting calculations (including underdrain calculations, if applicable). 8. A copy of the signed and notarized inspection and maintenance (AM) agreement. 9. A copy of the deed restriction. l�',%"'qt* t- ,a �I , Form SW401- Bloretention -Rev.7 Part III, Page 4 of 4 TYPICAL TREE WELL SUPPLEMENT FORM Chatham Park Collector Road W &R Project 02120469 Prelim Stormwater Management Report February 2015 Permit Number: fto be provided by D WO) �pf W ATE9 F ^ wr� WDENR STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM BIORETENTION CELL SUPPLEMENT This form must be filled out, printed and submitted. The Required Items Checklist (Part 1N) must be printed, filled out and submitted along with all of the required information. n . .�.. - a"'p48 P '�° 4' .oYy;e, ,;� .? ! 1_ PROJECT INFORMATION :p° ��": ° . a' ._ °° .< ° of:- _ t� , Project name ' Chatham Park - Collector Road ° Contact name taunter Freeman Phone number 919A69 -3340 Date February 24, 2015 Drainage area number 2 (typical tree well) Site Characteristics Drainage area 91000,,ft2 Impervious area 4,500 Percent Impervious 50.0% % �j Design rainfall depth 10, inch f 1 Peak Flow Calculations Is pre /post control of the 1 -yr, 24 -hr peak flow required? N (Y or N) 1 -yr, 24 -hr runoff depth in 1 -yr, 24 -hr intensity in /hr Pre - development 1 -yr, 24 -hr peak flow ft3lsec Post - development 1 -yr, 24 -hr peak flow ft3lsec Pre /Post 1 -yr, 24 -hr peak control ft'/sec Storage Volume: Non -SA Waters Minimum volume required Volume provided Storage Volume: SA Waters 1.5" runoff volume Pre- development 1 -yr, 24 -hr runoff Post - development 1 -yr, 24 -hr runoff Minimum volume required Volume provided Cell Dimensions Ponding depth of water Ponding depth of water Surface area of the top of the bioretention cell Length: Width: -or- Radius Media and Soils Summary Drawdown time, ponded volume Drawdown time, to 24 inches below surface Drawdown time, total: In -situ soil. Soil permeability Planting media soil: Soil permeability Soil composition % Sand (by volume) % Fines (by volume) % Organic.(by volume) Phosphorus Index (P- Index) of media Form SW401- Bioretention -Rev.8 June 25, 2010 SQL 4,500 0 ft' 7,384.5 ft' OK A ft 3 ft3 0 fl, ft3 3 inches Insufficient ponding depth 0 25 ft 0 ODA 2630 ft2 Insufficient surface area. 34 ft OK 8,ft Insufficient length — D14:1— E+� i3� 1�i✓>> i�,ti1 n 1 hr OK 1 hr OK 2 hr 120 in /hr OK infiltration 4000 in /hr Insufficient media rate. 83% Sand should be - 85-88% 2% Fines should be -8 -12% 15% Organic should be -3 -5% Total: 100% 10 (unitless) OK Parts I and II, Design Summary, Page 1 of 2 Permit Number: (to be provided by DWQ) Basin Elevations Temporary pool elevation 430.00 fmsl Type of bioretention cell (answer "Y" to only one of the two following questions): Is this a grassed cell? N (Y or N) Is this a cell with trees/shrubs? Y (Y or N) OK media depth Planting elevation (top of the mulch or grass sod layer) 429.67 fmsl Depth of mulch 2 inches OK Bottom of the planting media soil 426 fmsl Planting media depth 3:67 ft Depth of washed sand below planting media soil 0 ft Are underdrains being installed? Y (Y or N) How many clean out pipes are being installed? 1 OK What factor of safety is used for sizing the underdrains? (See 10 OK BMP Manual Section 12.3.6) Additional distance between the bottom of the planting media and 1 ft the bottom of the cell to account for underdrains Bottom of the cell required 425 fmsl SHWT elevation 423 fmsl Distance from bottom to SHWT 2 ft OK Internal Water Storage Zone (IWS) Does the design include IWS N (Y or N) Elevation of the top of the upturned elbow fmsl Separation of IWS and Surface 429.67 ft Planting Plan Number of tree species Number of shrub species 3 Number of herbaceous groundoover species 0 OK Additional Information Does volume in excess of the design volume bypass the Y (Y or N) OK bioretention cell? Does volume in excess of the design volume flow evenly distributed Y (Y or N) OK through a vegetated filter? What is the length of the vegetated filter? 50 it Does the design use a level spreader to evenly distribute flow? N (Y or N) Show how flow is evenly distributed. Is the BMP located at least 30 feet from surface waters (50 feet if Y (Y or N) OK SA waters)? Is the BMP located at least 100 feet from water supply wells? Y (Y or N) OK Are the vegetated side slopes equal to or less than 3:1? Y (Y or N) OK Is the BMP located in a proposed drainage easement with access Y (Y or N) OK to a public Right of Way (ROW)? Inlet velocity (from treatment system) 2 ft/sec Insufficient inlet velocity unless energy dissipating devices are being used. �yLZ-44 � t�D Is the area surrounding the cell likely to undergo development in N (Y or N) OK the future? Are the slopes draining to the bioretention cell greater than 20 %? N (Y or N) OK Is the drainage area permanently stabilized? Y (Y or N) OK Pretreatment Used (Indicate Type Used with an "X" in the shaded cell) Gravel and grass X (Sinches gravel followed by 3 -5 ft of grass) Grassed swale OK Forebay Other Form SW401- Bioretention -Rev.8 June 25, 2010 Parts I and II, Design Summary, Page 2 of 2 Permfl No: (to be assigned by DWQ) - ,'�"'` r_is;• e� `-"�`-;d:�fiwt,..�;'P"- _'•'•e', a... e,aa,= ,..s•:?vcs- -'P= zb'- u;-gni ,,:_ -.a-F -:ra 111:;;RE100 IR9Ot.� 5(8!0HECKLIST.�_ . d�-`•; �.�: ,�- ; 8 -� ..�'�Tt�M R` „r M. "��.. -. - �• . � �,�9w -.�- M�� Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a requirement has not been met, attach justification. E72n M_ FAIM Paget Plan Sheet No. 1. Plans (1" - 50' or larger) of the entire site showing: tN� Design at ultimate build -out, iAb ) Off -site drainage (if applicable), Delineated drainage basins (include Rational C coefficient per basin), Cell dimensions, Pretreatment system, High flow bypass system, Maintenance access, Recorded drainage easement and public right of way (ROW), Clean out pipe locations, Overflow device, and --) Boundaries of drainage easement. 1�(4D'lD LO Form SW401- Bioretention -Rev,7 2. Plan details (1" = 30' or larger) for the bioretention cell showing: Cell dimensions Pretreatment system, High flow bypass system, Maintenance access, Recorded drainage easement and public right of way (ROW), Design at ultimate build -out, Off -site drainage (if applicable), Clean out pipe locations, Overflow device, and Boundaries of drainage easement. Indicate the P -Index between 10 and 30 3. Section view of the bioretention cell (1" = 20' or larger) showing: Side slopes, 3:1 or lower Underdrain system (if applicable), and Bioretention cell layers (ground level and slope, pre- treatment, ponding depth, mulch depth, fill media depth, washed sand, filter fabric (or choking stone if applicable), #57 stone, underdrains (if applicable), SHWT level(s), and overflow structure] 4. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. The results of the soils report must be verified in the field by DWQ, by completing & submitting the soils investigation request form. County soil maps are not an acceptable source of soils information. All elevations shall be in feet mean sea level (fmsl). Results of soils tests of both the planting soil and the in situ soil must include- Soil permeability, Soil composition (% sand, % fines, % organic), and P- Index. 5. A detailed planting plan (1" = 20' or larger) prepared by a qualified individual showing: A variety of suitable species, Sizes, spacing and locations of plantings, Total quantity of each type of plant specified, A planting detail, The source nursery for the plants, and Fertilizer and watering requirements to establish vegetation. 6. A construction sequence that shows how the bioretention cell will be protected from sediment until the entire drainage area is stabilized. 7. The supporting calculations (including underdrain calculations, if applicable). 8 A copy of the signed and notarized inspection and maintenance (AM) agreement 9. A copy of the deed restriction. 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