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HomeMy WebLinkAbout20081730 Ver 1_401 Application_20090809 -77r--- T 771 August 11, 2009 tsgn??D,` F ? I ?l p r ?, NC Division of Water Quality Wilmington Regulatory Field */r 401 Wetlands Unit US Army Corps of Engineers RARa,, ,PAID 1650 Mail Service Center 69 Darlington Avenue °?+?? Raleigh, North Carolina 27699-165 Wilmington, NC 28403-1343 Attention: Mr. John Dorney SUBJECT: Keith Hills West Wetland Impact Green Engineering PN# 07-032 DWQ Project # 08-1730 USACOE AID# 2008-03170 Mr. Ronnie Smith Dear Mr. Dorney and Mr. Smith: Enclosed is a re-application for a wetland Impact. Please review this application for approval of the proposed impacts. The following is enclosed: • Application for Impact • Application Fee of $240 (to DWQ) • Agent Authorization Form • USGS Map of Project Area • County Soil Map of Project Area • Wetland Operation and Maintenance Agreement • Wetland Supplement Form • Soils Report for Seasonal Low Water Table • Reduced Construction Plans of Proposed Project • Wetland Fill Detail Area Map • Storm Water Wetland Plan Please notify me immediately if any additional information or clarification is needed. Respectfully, Sean P. Hein, PLS SPH PAPENNW\07032\0ffice\Wet1and Impact Cover Letter 08-11-09.doc GREEN ENGINEERING, PLLC WATER, WASTEWATER SURVEYING, PLANNING, PROJECT MANAGEMENT 303 N. GOLDSBORO ST. PO BOX 609 WILSON N.C. 27893 TEL 252.237.5365 FAX 252.243.7489 WWW.GREENENGINEERING.COM 08- 1-73D U D- \ NA a c Office Use Only: Corps action ID no. DWO project no. Form Version 1.3 Dec 10 2008 Pre-Construction Notification PCN Form A. A Hcant Information r 1. Processing M= 1 a. Type(s) of approval sought from the Corps: ®Section 404 Permit ? Section 10 Permit 1 b. Specify Nationwide Permit (NWP) number: 14 & 18 or General Permit (GP) number: 1 c. Has the NWP or GP number been verified by the Corps? ® Yes ? No 1d. Type(s) of approval sought from the DWQ (check all that apply): ® 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 ® No For the record only for Corps Permit: ? Yes ® 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 ® No 1 g. Is the project located in any of NC's twenty coastal counties. If yes, answer 1 h below. ? Yes ® No 1 h. Is the project located within a NC DCM Area of Environmental Concern (AEC)? ? Yes ® No 2. Project Information 2a. Name of project: Keith Hills est Tract "A" 2b. County: Harnett 2c. Nearest municipality / town: Lilington 2d. Subdivision name: Keith Hills Wes 2e. NCDOT only, T.I.P. or state project no: 3. Owner Information 3a. Name(s) on Recorded Deed: Campbell University 3b. Deed Book and Page No. 674-395 3c. Responsible Party (for LLC if applicable): 3d. Street address: PO Box 16 3e. City, state, zip: Buies Creek, NC 27506 3f. Telephone no.: 910-893-1217 3g. Fax no.: 910-814-4361 3h. Email address: Page 1 of 10 PCN Form - Version 1.3 December 10, 2008 Version 4. Applicant Information (if different from owner) 4a. Applicant is: ® Agent ? Other, specify: 4b. Name: Penn-Wynne Homes 4c. Business name (if applicable): t &rM A??P-t-,- &4 4d. Street address: 216 Whispering Pines Drive 4e. City, state, zip: Spring Lake, NC 28390 4f. Telephone no.: 910-814-3177 4g. Fax no.: 4h. Email address: mshean@pwhomes.com 5. Agent/Consultant Information (if applicable) 5a. Name: Sean P. Hein 5b. Business name (if applicable): Green Engineering, PLLC 5c. Street address: 303 Goldsboro St E. 5d. City, state, zip: Wilson, NC 27893 5e. Telephone no.: 252-237-5365 5f. Fax no.: 252-243-7489 5g. Email address: s.hein@greeneng.com Page 2 of 10 PCN Form - Version 1.3 December 10, 2008 Version B. Project Information and Prior Project History 1. Property Identification 1a. Property identification no. (tax PIN or parcel ID): 0579-19-1768 1 b. Site coordinates (in decimal degrees): Latitude: 35°23'49 Longitude: - 78°45'24" (DD.DDDDDD) (-DD.DDDDDD) 1 c. Property size: 8.73 (this phase) 478.29 (Total property) acres 2. Surface Waters 2a. Name of nearest body of water (stream, river, etc.) to Cape Fear River proposed project: 2b. Water Quality Classification of nearest receiving water: 2c. River basin: Cape Fear 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: Phase is wooded. Golf Course and existing subdivision adjacent 3b. List the total estimated acreage of all existing wetlands on the property: 34 Acres 3c. List the total estimated linear feet of all existing streams (intermittent and perennial) on the property: Not Know 3d. Explain the purpose of the proposed project: Access for single family subdivision lots 3e. Describe the overall project in detail, including the type of equipment to be used: Road grading and utilities for subdivision. Standard grading and trenching equipment to be used. 4. Jurisdictional Determinations 4a. Have jurisdictional wetland or stream determinations by the Corps or State been requested or obtained for this property / ED Yes ? No ? Unknown project (including all prior phases) in the past? Comments: 4b. If the Corps made the jurisdictional determination, what type ®Preliminary ? Final of determination was made? 4c. If yes, who delineated the jurisdictional areas? Agency/Consultant Company: Name (if known): Unknown previous consultant Other: 4d. If yes, list the dates of the Corps jurisdictional determinations or State determinations and attach documentation. On-site verification with Ronnie Smith of USACOE 5. Project History 5a. Have permits or certifications been requested or obtained for ® Yes ? No ? Unknown this project (including all prior phases) in the past? 5b. If yes, explain in detail according to "help file" instructions. This is a re-submittal of DWQ Project#08-1730 and USACOE AID#2008-03170 No other records known. 6. Future Project Plans 6a. Is this a phased project? ® Yes ? No 6b. If yes, explain. Penn-Wynn Homes is building this phase of an overall plan owned by Campbell University Page 3 of 10 PCN Form - Version 1.3 December 10, 2008 Version C. Proposed Impacts Inventory 1. Impacts Summary 1 a. Which sections were completed below for your project (check all that apply): ® Wetlands ? Streams - tributaries ? 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 jurisdiction number - Type of impact Type of wetland Forested (Corps - 404, 10 Area of impact Permanent (P) or (if known) DWQ - non-404, other) (acres) Temporary T W1 ®P ? T Fill Flood ® Yes ? No ® Corps ? DWQ 0.0777 W2 ®P ? T Fill Flood ® Yes ? No ® Corps ? DWQ 0.1212 W3 ®P ? T Fill Flood ® Yes ? No ® Corps ? DWQ 0.0051 W4 ®P ? T Fill Flood ® Yes ? No ® Corps ? DWQ 0.0025 W5 ? P ? T ? Yes ? Corps ? No ? DWQ W6 ? P ? T ? Yes ? Corps ? No ? DWQ 2g. Total wetland impacts 0.2065 2h. Comments: 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 Type of jurisdiction Average Impact number - (PER) or (Corps - 404, 10 stream length Permanent (P) or intermittent DWQ - non-404, width (linear Temporary (T) (INT)? other) (feet) feet) S1 ? P ? T ? PER ? Corps ? INT ? DWQ S2 ? P ? T ? PER ? Corps ? INT ? DWQ S3 ? P ? T ? PER ? Corps ? INT ? DWQ S4 ? PMT ? PER ? Corps ? INT ? DWQ S5 ? P ? T ? PER ? Corps ? INT ? DWQ S6 ? P ? T ? PER ? Corps ? INT ? DWQ 3h. Total stream and tributary impacts 3i. Comments: Page 4 of 10 PCN Form - Version 1.3 December 10, 2008 Version 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 individually list all open water impacts below. 4a. 4b. 4c. 4d. 4e. Open water Name of waterbody impact number - (if applicable) Type of impact Waterbody type Area of impact (acres) Permanent (P) or Temporary T 01 ?P?T 02 ?P?T 03 ?P?T 04 ?P?T 4f. Total open water impacts 4g. Comments: 5. Pond or Lake Construction If and or lake construction proposed, then complete the chart below. 5a. 5b. 5c. 5d. 5e. Wetland Impacts (acres) Stream Impacts (feet) Upland Pond ID Proposed use or purpose (acres) number of pond Flooded Filled Excavated Flooded Filled Excavated Flooded P1 P2 5f. Total 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 an impacts require mitigation, then you MUST fill out Section D of this form. 6a. ? Neuse ? Tar-Pamlico ? Other: Project is in which protected basin? ? Catawba ? Randleman 6b. 6d. 6e. 6f. 6g. Buffer impact number - EReason Buffer Zone 1 impact Zone 2 impact Permanent (P) or Stream name mitigation (square feet) (square feet) Temporary T required? 131 ? P ? T ? Yes ? No B2 ?P?T ?Yes ? No B3 ?P?T ?Yes ? No 6h. Total buffer impacts 61. Comments: Page 5 of 10 PCN Form - Version 1.3 December 10, 2008 Version D. Impact Justification and Mitigation 1. Avoidance and Minimization 1a. Specifically describe measures taken to avoid or minimize the proposed impacts in designing project. There is no other access to property. Minimum Road section is utilized and routed to create least impact 1 b. Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques. Fill only permanent areas needed for road. no temporary fills required. 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 ? No 2b. If yes, mitigation is required by (check all that apply): ? DW Q ? 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 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: ? warm ? cool ?cold 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 1.3 December 10, 2008 Version 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 ® 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 PCN Form - Version 1.3 December 10, 2008 Version 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? 1 b. If yes, then is a diffuse flow plan included? If no, explain why. ? Yes ? No Comments: 2. Stormwater Management Plan 2a. What is the overall percent imperviousness of this project? 50 (this phase) below 20 (total) % 2b. Does this project require a Stormwater Management Plan? ® 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: ? Certified Local Government 2e. Who will be responsible for the review of the Stormwater Management Plan? ? DWQ Stormwater Program ® DWQ 401 Unit 3. Certified Local Government Stormwater Review 3a. In which local government's jurisdiction is this project? Harnett County ? Phase II ? NSW 3b. Which of the following locally-implemented stormwater management programs ? 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 ? Coastal 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? 5. DWQ 401 Unit Stormwater Review 5a. Does the Stormwater Management Plan meet the appropriate requirements? ? Yes ? No 5b. Have all of the 401 Unit submittal requirements been met? ? Yes ? No Page 8 of 10 PCN Form - Version 1.3 December 10, 2008 Version F. Supplementary Information 1. Environmental Documentation (DWQ Requirement) 1a. Does the project involve an expenditure of public (federal/state/local) funds or the ? Yes ® No use of public (federal/state) land? 1 b. 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 ® No or Riparian Buffer Rules (15A NCAC 2B .0200)? 2b. Is this an after-the-fact permit application? ? Yes ® 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. 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. Harnett County Utilities (Municipal collection) Page 9 of 10 PCN Form - Version 1.3 December 10, 2008 Version 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 ® No habitat? 5b. Have you checked with the USFWS concerning Endangered Species Act ? Yes ® No impacts? ? Raleigh 5c. If yes, indicate the USFWS Field Office you have contacted. ? Asheville 5d. What data sources did you use to determine whether your site would impact Endangered Species or Designated Critical Habitat? This is an on going plan - there has been no notification of any critical habitats 6. Essential Fish Habitat (Corps Requirement) 6a. Will this project occur in or near an area designated as essential fish habitat? [:] Yes ® No 6b. What data sources did you use to determine whether your site would impact Essential Fish Habitat? This plan will not create negative runoff to the stream 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 ® 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? There are no recorded claims on the property 8. Flood Zone Designation (Corps Requirement) 8a. Will this project occur in a FEMA-designated 100-year floodplain? -T - ® Yes ? No 8b. If yes, explain how project meets FEMA requirements: There will be no rise in the flood plain area 8c. What source(s) did you use to make the floodplain determination? Firm Panel Sean P. Hein 08-12-2009 Applicant/Agent's Printed Name Applicant/Agent's Signature Date (Agent's signature is valid only if an authorization letter from the applicant is provided.) Page 10 of 10 PCN Form - Version 1.3 December 10, 2008 Version AGENT AUTHORIZATION FROM Project: Keith Hills West, Harnett County, NC I(we), the current property owner(s), authorize Sean P. Hein of Green Engineering, PLLC of North Carolina to act as agent on behalf of Penn-Wynn Homes, NC in the processing of permit applications, to famish upon request supplemental information in support of applications, etc. from this day forward. This 15 day of September, 2008. Landowner/Developer: Penn-Wynne Homes NC, inc. Address: 216 Whispering Pines Drive Spring Lake, NC 28390 Phone: 910-814-3177 r q ?L 1)? 7///rV Name Signature j?rcr'??,u?? P..%MNNLYW70341 M" 4GIGNr AUTHORIZATION MCIM.Aoc GREEN ENGINEERING,PLLC WATER, WW MfAM SURVEYING, PLANNING, PROJECT NANAGMINI 303 N. GOM1060 $1. PO 00.9 $00 WILSON N.C. 27003 Ill 252.237330 FAX 252.243.7409 WWW.GR£ENENGiNIERING.COM b? Sir. IE I M I Ri I , r d ^? 01 r" m ?SJZ? a ,sue cf I y u1 uie J `° r 1:10 y= L I f -- ,.G?- ??? -l r I • d / ???' 1. -? _-?. I4UJ ?.. ••1? L ? 1p C Ca, i f J ?/ co N", NJ m i - 01 \ U LL co - ! I U O v o It c r E a u_ _ t o r {4 I !a J a P . - '4 / o E OE za, sll ro J Ljj J r ?j r pzn Z r� n c. o W D chi f c D 0 o Zo 0 D W �� X Z •� 1 s 0 m 1110 / g c N MN o n D\ �� / A Z m D z� y O 1 co m _ z o o W y 1' E; y Noq z z. z m Y11 Om OD r - '� m pZ y \ O o m� D .p ::. W i .- y D Lt. ' . r D , / Z Z g_ oco s a m CD G �t 1 s A r m I f �� m C� 03 O D D �ml CD m m :2 o co nl, •D n W �y J �, K�,." m , .. � O ZIP. LnB CD J'Y 01 ED bD r _ : c;, m i y i ..CJI �.. h �4 �/" • j �-' '-� �.. .-�\.' � ° }�,� � C� W W �,'_, obi • � m MaS ... p a Z ' Z l_ ca at CO oZ l Goq O G m 1 J 1D D Z03 zAtA m c 1600 WO FEET_zr? Q o 1 Ait N� � ' �Ov1! 7 � �01Z ^IAp � S ! = za�d coo Co 0 WETLAND OPERATION AND MAINTENANCE AGREEMENT The wetland system is defined as the wetland, pretreatment including forebays and the vegetated filter. Maintenance activities shall be performed as follows: After every significant runoff producing rainfall event and at least monthly: a. Inspect the wetland system for sediment accumulation, erosion, trash accumulation, vegetated cover, and general condition. b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within 2 to 5 days as designed. 2. Repair eroded areas immediately, re-seed as necessary to maintain good vegetative cover, mow vegetative cover to maintain a maximum height of six inches, and remove trash as needed. 3. Inspect and repair the collection system (i.e. catch basins, piping, swales, dprap, etc.) quarterly to maintain proper functioning. 4. Remove accumulated sediment from the wetland basin system semi-annually or when depth is reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality (i.e. stockpiling near a wet [wetland] detention basin or stream, etc.). The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments. When the permanent pool depth reads 124.75 feet in the main pond, the sediment shall be removed. [For stormwater wetlands: If the elevation of the marsh areas exceed the permanent pool elevation, the sediment should be removed to design levels. This shall be performed by removing the upper 6 inches of soil and stockpiling it. Then the marsh area shall be excavated six inches below design elevations. Afterwards the stockpiled soil should be spread over the marsh surface. The soil should not be stockpiled for more than two weeks.] When the permanent pool depth reads 124.75 feet in the forebay [and micro-pool], the sediment shall be removed. BASIN DIAGRAM (fill in the blanks) Permanent Pool Elevation 127.00 Sediment Removal El. 124.7 --------------- Y- - _-____Sediment Removal Elevation-124.75 --- 75% ----Remo---- evati- 24.75 Bottom E vation 124.001 A 5% FOREBAY MAIN POND 5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These plants shall be encouraged to grow along the vegetated shelf and forebay berm. Page 1 of 2 '-[For wetlands: Wetland planting densities in the marsh areas should be maintained by replanting bare areas as needed. Wetland plants should be encouraged to grow in the marsh areas.] 6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain shall be minimized to the maximum extent practical. 7. All components of the wet [wetland] detention basin system shall be maintained in good working order. 8. Level spreaders or other structures that provide diffuse flow shall be maintained every six months. All accumulated sediment and debris shall be removed from the structure, and a level elevation shall be maintained across the entire flow spreading structure. Any down gradient erosion must be repaired and/or replanted as necessary. I acknowledge and agree by my signature below that 1 am responsible for the performance of the seven maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Print name: Wrk n L, 4 nn.k tkot%ts VAC, Mc- :5kb& Addre Phone Signat Date: ((L l a ?R 116% Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a resident of the subdivision has been named the president. a Notary Public for the State of ae2?? County of QJWMijwzg? , do hereby certify that personally appear d before me this AZM day of 00 , and acknowledge the due execution of the forgoing wet [wetland] detention basin maint nance requirements. Witness my hand and official seal, t° COMMONWEALTH OF PE=NNSYLVANIA Notarial Seal Diana Zajac, Notary Public Lower Merlon Twp., Montgomery County My CAmmissbn Expires Oct 23, 2010 Member. Pennsylvania Association of Notaries SEAL My commission expires '2?3///} Page 2 of 2 is: SO E. V14 nnA-14a0 d ?4 - ??.k 216 _ 1• o . 19 14Jr 246. LJG AA1 .).%I Permit Number (to be provided by DWQ) .* NCDENR STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM WETLAND SUPPLEMENT This form must be filled out, printed and submitted. The Required Items Checklist (Part lll) must be printed, filled out and submitted along with all the required information. O?OF W A TEgOG h O Y Project name KEITH HILLS TRACT "A" Contact name Sean Hein Phone number 252-237-5365 Date August 6, 2009 Drainage area number All Site Characteristics Drainage area 383,763.00 ftImpervious area 191,881.00 ft2 Percent impervious 50.0%% Design rainfall depth 0.44 inch Peak Flow Calculations 1-yr, 24-hr rainfall depth 3.06 in 1-yr, 24-hr intensity 0.13 in/hr Pre-development 1-yr, 24-hr runoff 16.00 ft3/sec Post-development 1-yr, 24-hr runoff 17.00 ft3/sec Pre/Post 1-yr, 24-hr peak control 1.00 ft3/sec Storage Volume: Non-SA Waters Minimum required volume 16,000.00 ft3 Volume provided (temporary pool volume) 16,000.00 ft3 OK Storage Volume: SA Waters Parameters 1.5" runoff volume ft3 Pre-development 1-yr, 24-hr runoff volume ft3 Post-development 1-yr, 24-hr runoff volume ft3 Minimum volume required ft3 Volume provided ft 3 Outlet Design Depth of temporary pool/ponding depth (DPl,,t,) 12.00 in OK Drawdown time 2.00 days OK Diameter of orifice in Coefficient of discharge (CD) used in orifice diameter 3.00 (unitless) calculation Driving head (Ho) used in the orifice diameter calculation 0.34 ft OK Form SW401-Wetland-Rev.4-2/10/09 Parts I and II. Project Design Summary, Page 1 of 3 Permit Number (to be provided by DWQ) Surface Areas of Wetland Zones Surface Area of Entire Wetland 16,000.00 ft2 OK Shallow Land 4,800.00 ftZ OK The shallow land percentage is: 0.30% Shallow Water 6,400.00 ftZ OK The shallow water percentage is: 0.40% Deep Pool Forebay portion of deep pool (pretreatment) 1,600.00 ft' OK The forebay surface area percentage is: 0.10% Non-forebay portion of deep pool 800.00 ft2 OK The non-forebay deep pool surface area percentage is: 0.05% Total of wetland zone areas 13,600.00 ftZ Enter data into the shaded cells in this section. Add or subtract the following area from the zones -2,400.00 ft2 Topographic Zone Elevations Temporary Pool Shallow Land (top) 127.00 fmsl Permanent Pool Shallow Water (top) 126.00 fmsl Deep Pool (top) 125.50 fmsl Most shallow point of deep pool's bottom 1200 fmsl Deepest point of deep pool's bottom 124.00 fmsl Design must meet one of the following two options: This design meets Option #1, Deep pool is 6inches below SLWT, If yes: y (Y or N) SLWT (Seasonally Low Water Table) 126.00 fmsl OK This design meets Option #2, Has a clay liner If yes: Depth of topsoil above clay liner in Topographic Zone Depths Temporary Pool Shallow Land 12.00 in OK Permanent Pool Shallow Water 6.00 in OK Deep Pool (shallowest) 18.00 in OK Deep Pool (deepest) 18.00 in OK Planting Plan Are cattails included in the planting plan? N (Y or N) OK Number of Plants recommended in Shallow Water Area: Herbaceous (4'cubic-inch container) 1,600 Number of Plants recommended in Shallow Land Area: Herbaceous (4'cubic-inch container), OR 1,200 Shrubs (1 gallon or larger), OR 192 Trees (3 gallon or larger) and Herbaceous (4+ cubic-inch) 24 and 960 Number of Plants provided in Shallow Water Area: Herbaceous (4'cubic-inch container) 1,600 OK Number of Plants provided in Shallow Land Area: Herbaceous (4`cubic-inch container) 1,600 OK Shrubs (1 gallon or larger) 192 OK Trees (3 gallon or larger) and 24 OK Grass-like Herbaceous (4+ cubic-inch) 960 OK Form SW401-Wetland-Rev.4-2/10/09 Parts I and 11. Project Design Summary, Page 2 of 3 Permit Number (to be provided by DWQ) Additional Information Can the design volume be contained? Does volume in excess of the design volume flow evenly distributed through a vegetated filter? What is the length of the vegetated filter? Are calculations for supporting the design volume provided in the application? Is BMP sized to handle all runoff from ultimate build-out? Is the BMP located in a recorded drainage easement with a recorded access easement to a public Right of Way (ROW)? The length to width ratio is: Approximate wetland length Approximate wetland width Approximate surface area using length and width provided Will the wetland be stabilized within 14 days of construction? Y (Y or N) OK Y (Y or N) OK 30.00 ft y (Y or N) OK Y (Y or N) OK y (Y or N) OK 3.33 :1 OK 250.00 ft 75.00 ft 00 ft T 18 750 his approx. surface area is within this number of square . , feet of the entire wetland surface area reported above: y (Y or N) OK Form SW401-Wetland-Rev.4-2/10/09 Parts I and 11. Project Design Summary, Page 3 of 3 SEASONAL WATER TABLE ASSESSMENT On THREE (3) SOIL BORINGS Keith Hills Rd Lillington NC PREPARED FOR: Green Engineering 303 Goldsboro St. E Wilson, NC, NC 27853 PREPARED BY: SEPI Engineering and Construction 1025 Wade Ave Raleigh, NC 27605 Page 2 of 4 INTRODUCTION AND PURPOSE In May 2009, Green Engineering hired SEPI Engineering and Construction (SEPI) to conduct a soil analysis of three (3) borings located on the eastern side of Keith Hills Rd in Lillington, NC. The purpose of the soil borings assessment is to determine the depth of the seasonal high water table and the estimated low water table. This information will be used by Green Engineering to design and construct a stormwater wetland on the eastern side of Keith Hills Rd. METHODOLOGY Prior to performing field work, SEPI consulted reviewed the Soil Survey for Harnett County, NC. The purpose of the literature review was to obtain soil information in the location of the three (3) soil borings. Information obtained included soil maps units, depth to water table, and hydric status. Additionally, SEPI procured soil map information from the US Department of Agriculture National Resources Conservation Service (USDA NRCS) Web Soil Survey. Field work to review the three (3) soil borings was conducted on June 1, 2009. During the field assessment, a soil bore was conducted at each point pre-selected by Green Engineering. Soil properties were assessed at six (6) inch intervals down to the seasonal high water table. Soil indicators for seasonal water table depth include redoximorphic features (i.e. gleying, or low-chroma colors). Additionally, SEPI also determined the existing water table by observing and measuring free water in the auger hole (i.e., free water in pit). During the soil borings assessment particular attention was paid to soil color, hue, texture, layering, and redoximorphic features. Field was conducted during the middle of the growing season. To date, site conditions are considered to be in a `normal' state in terms of annual precipitation. However, during the past several years (2006-2008), the site has experienced below normal to abnormal annual precipitation according to the National Oceanic and Atmospheric Administration (NOAA) website. RESULTS Based on the soil field assessment and a review of USDA NRCS soil map data of the three (3) soil borings, SEPI has concluded the following. The narrative information is summarized in Table 1 where soils information is detailed. Soil Bore 919 Field observations indicated that Bore 919 depicted its seasonal high water table at a depth of 14-16 inches below surface. At the seasonal high water table depth, redoximorphic (i.e. gley and/or mottling) indicators were present. SEPI compared its field findings with the USDA NRCS Web Soil Survey data and concluded that SEPI's soil boring results did not appear to have similar hue, value or chroma as compared to the Seasonal High Water Table Assessment Report of Findings (June 2009) (Keith Hills Rd- Lillington, NC) Page 3 of 4 USDA NRCS Web Soil Survey data. Possible reasons for SEPI's field soil data not comparing well with the NRCS Web Soil Survey data could be attributed to the NRCS Web Soil Survey map scale (i.e. too large a scale to accurately depict smaller units) or soil observer differences interpreting color, hue, value and texture. Other potential reasons for differences in the NRCS data conflicting with observed data by SEPI include probable modification to the landscape as West Buies Creek is not impounded. The field work for the Harnett County Soil Survey occurred in 1973, and the soils book does not noted an impoundment on West Buies Creek. At a depth of 34 inches, free water in the pit (i.e., constant groundwater flow) was observed. The field observation data by SEPI differed from those of the Web Soil Survey, which noted the area where Soil Bore 919 is located as having a water table depth of > 80 inches below surface. Soil Bore 920 Field observations indicated tha depth of 7 inches below surface. and/or mottling) indicators wer USDA NRCS Web Soil Survey appear similar in hue, value or Survey data. Bore 920 depicted its seasonal high water table at a At the high water table depth, redoximorphic (i.e. gley present. SEPI compared its field findings with the data and concluded that SEPI's soil boring results did chroma as compared to the USDA NRCS Web Soil At a depth of 29 inches, free water in the pit (i.e. groundwater flow) was observed. The field observation data by SEPI was dissimilar to the Web Soil Survey, which depicted the area where Soil Bore 919 is located as having a water table depth of 0 inches below surface. Soil Bore 921 Field observations indicated that Bore 921 depicted its seasonal high water table at a depth of 9 inches below surface. At the water table depth, redoximorphic (i.e. gley and/or mottling) indicators were present. SEPI compared its field findings with the USDA NRCS Web Soil Survey data and concluded that SEPI's soil boring results did not appear to have similar hue, value or chroma as compared to the USDA NRCS Web Soil Survey data. Possible reasons for SEPI's field soil data not comparing well with the NRCS Web Soil Survey data could be attributed to the NRCS Web Soil Survey map scale (i.e. too large a scale to accurately depict smaller units) or soil observer differences interpreting color, hue, value and texture. Additionally, SEPI found it necessary to move the sampling location of Bore 921 to the natural ground between the edge the pond berm and of the wetland as the initial location of the bore was on the pond berm. At a depth of 9 inches, free water in the pit (i.e. groundwater flow) was observed. The field observation data by SEPI differed from those of the Web Soil Survey, which depicted the area where Soil Bore 919 is located as having a water table depth of 0 inches below surface. Seasonal High Water Table Assessment Report of Findings (June 2009) (Keith Hills Rd- Lillington, NC) Page 4 of 4 Table 1: Field Assessed Soil Borin Bore Depth Dept Hole (inches) Free in Pi 919 0-6 7.5 YR S 919-921 h 1 M Water Va t rro ernes. atrix Color lue/Chroma 3/3 Texture Gravelly sand clay oam 6-12 7.5 YR 3/3 Gravelly sand clay loam 12-18 7.5 YR 6/1 Gravelly sand clay loam 18-24 7.5 YR 6/1 Gravelly sand 24-30 7.5 YR 6/1 Gravelly sand 30-34 7.5 YR X 6/1 Gravelly sand 920 0-6 7.5 YR 4/3 Sand clay loam 6-12 7.5 YR 511 Sand clay loam 12-18 7.5 YR 511 Sand clay loam 18-24 7.5 YR 511 Sand clay loam 24-30 7.5 YR X 511 Sand clay loam 921 0-6 7.5 YR 4/1 Gravelly sand clay loam 6-12 7.5 YR X 3/1 Sand clay loam 12-18 7.5 YR N/A Sand clay loam "X" notes where water was encountered in the auger bore. CONCLUSION SEPI has completed the soil borings assessment for the three (3) borings located on the eastern side of Keith Hills Rd in Lillington, NC. Based on historical data attained from NOAH, annual precipitation has fallen below normal for years 2006 through 2008. The annual rainfall deficit for 2006 was 8-12 inches and for 2007 the deficit was 12-20 inches below normal. In 2008, rainfall levels recovered compared to 2006 and 2007 as deficits were measured from 2-6 inches below normal. To date in 2009, rainfall levels are `normal' through the month of May. Information attained from the field soil borings has revealed that Bore 919 has a depth to the seasonal high water table at 14-16 inches, and groundwater was observed at a depth of 34 inches below surface. Bore 920 has a 7 inch depth to the seasonal high water table, and groundwater was observed at a depth of 29 inches below surface. Bore 921 displayed a depth to seasonal high water table at a depth of 9 inches, and groundwater was observed at a depth of 10 inches below surface. It is recommended that the depth of excavation of the stormwater wetland be at least to the seasonal high water table, but preferably it should be down to depths where groundwater was encountered by SEPI. Excavation to the observed groundwater depths described above will ensure that site conditions remain, at a minimum, hydric for the stormwater wetland during abnormal precipitation years. Seasonal High Water Table Assessment Report of Findings (June 2009) (Keith Hills Rd- Lillington, NC) ?, 7B py $ .G ? 8 E g g g ? E g E ?{$j$ x a g? ? ? § yaagQ. x• gu ? s 8 H E }' ° 5 'ell EY Hill ?? $J°? Eb 5? ? ? ssg vg g ?a? ? 3 ggg ?t _Y `. ,$$ss?&fi I -is $ .? pp i G rl As is E E ?Ra Y S w 8 U G i? e ?( 3 g £y ISYg?^o?iYi xSS i E E Yi E§i .a 3 gg s € 'Ell G s p 8 +?i ° T$3 s E? ? gsg $ £g.: a= ffi ?? a4a t x E Y Ei $y ? a + ?' 8 E a a L g ?p ? s S ? g E F x5 8 ggpa aga W$gE ?y} ? ^ ?yg xS?? xs .G .E xp ???? ? ? $ $?? ?????F? p6? ?i ?fy 'a?i]t•??Qr ? § E x9$°??? ?,E '.L?yII?¢t? ? ?.? 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