Loading...
HomeMy WebLinkAbout20120635 Ver 1_401 Application_20120612a Robert J Goldstein & Associates, Inc ENVIRONMENTAL CONSULTANTS 1221 Corporation Parkway Raleigh, NC 27610 Tel (919) 872 1174 Fax (919) 872 9214 email rgoldstem@RJGAcarolma com To G 'D�! - YO/ Wwmi.r *'14- WE ARE SENDING YOU ❑ Attached ❑ Under separate cover via 2012p635 LIETTE M OF UMMOGUTUL GATE 26' 2 ` NO ATTENT ON E the following items ❑ Shop drawings ❑ Prints ❑ Plans ❑ Samples ❑ Specifications ❑ Copy of letter ❑ Change order ❑ THESE ARE TRANSMITTED as checked below • For approval ❑ Approved as submitted • For your use ❑ Approved as noted • As requested ' " , to I i • For review and comment ❑ • FOR BIDS DUE 19 THESE ARE TRANSMITTED as checked below • For approval ❑ Approved as submitted • For your use ❑ Approved as noted • As requested ❑ Returned for corrections • For review and comment ❑ • FOR BIDS DUE 19 RFMARKC • Resubmit copies for approval • Submit copies for distribution • Return corrected prints ❑ PRINTS RETURNED AFTER LOAN TO US COPY TO ,/J SIGNED //� RMT2 at nr€— W omw ran of If 1 u es are not oted k dly of fy $ t o C� WAr�9 °c 2®120635 Office Use Only Corps action ID no DWQ project no Form Version 1 3 Dec 10 2008 Page 1 of 11 PCN Form — Version 1 3 Dec 2008 Pre - Construction Notification (PCN) Form i Section A Applicant Information 1 Processing la Type(s) of approval sought from Corps ® Section 404 Permit ❑ Section 10 Permit 1 b Specify Nationwide Permit (NWP) number NWP 3 and NWP 16 or General Permit (GP) number 1c Has the NWP or GP number been verified by the Corps? ® Yes Craig Brown ❑ No 1 d 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 1h Is the project located within a NC DCM Area of Environmental Concern (AEC) ❑ Yes ® No 2 Project Information 2a Name of project Lake Ben Johnson Dredging and Dam Repair 2b County Orange 2c Nearest municipality / town Hillsborough 1 8 miles west of downtown 2d Subdivision name NA NA 7 I 2e NCDOT T I P or state project no 3 Owner Information , Zti %2 3a Name(s) on Recorded Deeds Town of Hillsborough PIN # 9864048660 man ti 3b Deed Book and Page No DB 000 page 000 3c Responsible Party (for LLC) Kenny Keel P E Town Engineer & Utilities Director 3d Street address 101 East Orange St Hillsborough NC 27278 3e Mailing Address PO Box 429 Hillsborough NC 27278 3f Telephone no 919 732 1270 ext 75 3g Fax no 919 644 2390 3h Email address kenny keel @hillsboroughnc org Page 1 of 11 PCN Form — Version 1 3 Dec 2008 4 Applicant Information (if different from owner) 4a Applicant is OWNER ❑ Agent ❑ Other specify 4b Name Kenny Keel P E Town Engineer & Utilities Director 4c Business name See above 4d Street address 4e City state zip 2a 4f TelePK6 a no 2b 4g Fax no 2c 4h Email address 5 Agent/Consultant Information (if applicable) 5a Name Gerald Pottern (Environmental Consultant) 5b Business name Robert J Goldstein & Associates Inc 5c Street address 1221 Corporation Pkwy suite 100 5d City state zip Raleigh NC 27610 5e Telephone no 919 872 1174 5f Fax no 919 872 9214 5g Email address Gpottern@RJGAcarolrna corn 5h Name Jerry Robblee P E (Engineering Consultant) 51 Business name Schnabel Engineering 51 Street address 11 A Oak Branch Drive 5k City state zip Greensboro NC 27407 51 Telephone no 336 274 9456 5m Fax no 336 274 9486 5n Email address grobblee @schnabel eng com Section B Project Information and Prior Project History 1 Property Identification 1 a Property identification no (tax PIN or parcel ID) PIN # 9864048660 Town of Hillsborough 1 b Site coordinates (in decimal degrees) Latitude 36 0712 Longitude 79 1303 (water intake) Latitude 36 0704 Longitude 79 1323 (sed basin) 1 c Property size 6 9 acres (portion of 29 7 acre total property) 2 Surface Waters 2a Name of nearest body of water (stream river etc) Eno River 2b Water Quality Classification of nearest receiving water Class WS III CA NSW 2c River basin I Neuse River DWQ 03 04 01 USGS 03020201 Page 2 of 11 PCN Form — Version 1 3 Dec 2008 3 Project Description 3a Describe the existing conditions on the site and general land use in the vicinity of the project at time of this application Lake Ben Johnston Dam (NC Dam Safety NID# NC00774 Orang 006) is a 15 ft high water supply impoundment on the Eno River 16 mile west of downtown Hillsborough in Orange County NC The spillway crest is approximately 110 feet long with an elevation of 514 3 feet and the drainage basin area is 60 sq mi The Town s raw water intake is on the north (left) bank adjacent to the dam and Ben Johnston Rd (SR 1144) The Town property west of the intake along the north and east shoreline of the lake is mostly forested and is used as a park (Kings Highway Park) with dirt trails and a picnic table dust north of the lake The existing 0 8 acre sediment disposal basin in this area was created (excavated in uplands) in the early 1980s when the lake was last dredged The previously deposited lake sediment has since been colonized by grasses sedges greenbrier blackberries and small trees (green ash black willow box elder sweetgum) thus creating a 0 31 acre isolated wetland in the bottom of the sediment basin A high berm around the sediment basin (16 ft above normal pool) isolates it from the adjacent river floodplain Most of the south and west shoreline of the lake is private residential large lots with homes 100 ft or farther from the lake shoreline and visually buffered by mature hardwood forest Downstream of the dam both banks of Eno River are forested down to Dimmocks Mill Rd (SR 1134) The Hillsborough WTP is on the north bank of the river 0 4 mile east of Ben Johnston Dam Since the last lake dredging 30+ years ago Ben Johnston Lake has accumulated sediment and woody debris that reduces the lake s storage volume and threatens to interfere with the raw water intake operation The dam s dram gates are partially clogged with sediment and debris and the downstream face of the dam needs minor concrete repairs Hillsborough has contracted Schnabel Engineering of Greensboro to develop plans to dredge and dispose of the excess sediment and to conduct dam inspection and repairs as needed while the lake is drawn down for the dredging operation 3b List the total estimated acreage of all existing wetlands on the property The Town property along the north and east shore of the lake west of Ben Johnston Dam and south of Ben Johnston Road contains two lake fringe jurisdictional wetlands Wetland GB and GC each approximately 0 03 acre and contiguous with the lake pool (delineated in March 2012 by Gerald Pottern of RJG &A) The private property along the south shore of the lake was not accessible on foot but visual inspection of this area from the lake showed a steep bank with no evidence of shoreline wetlands The existing sediment basin contains a 0 31 acre man made isolated wetland inadvertently created when nearby vegetation colonized the wet sediment deposited 30 years ago US ACE agent Craig Brown verified that this feature is isolated and not subject to federal jurisdiction but it may be subject to NC isolated wetlands rules No wetland was found along the Eno River within 300 feet downstream of the dam 3c List the total estimated linear feet of all existing streams (intermittent and perennial) on the property There is no intermittent or perennial stream on the property along the north and east shore of the lake west of Ben Johnston Dam and south of Ben Johnston Road where land disturbing activities will occur The private property along the south shore of the lake was not accessible on foot but USDA soil maps topographic maps and visual inspection of this area from the lake showed no evidence of streams Sevenmile Creek (perennial) enters the southwest side of the lake 1 100 feet upstream of the dam well beyond the proposed dredging area The sheet pile end wall at the tail of the stilling pool is 80 feet downstream of the spillway crest and the stilling pool area is approximately 0 12 acre of open waters Eno River below the stilling pool is a perennial stream mostly 45 to 60 feet wide An unnamed tributary (small perennial) flowing sothward enters the north bank of Eno River 250 feet downstream of the dam also well beyond the project impact area On the USDA Soil Survey of Orange County this tributary appears closer to the dam than it really is 3d Explain the purpose of the proposed project The dredging project will remove approximately 3200 cubic yards of accumulated sediment from the northeastern portion of Lake Ben Johnston closest to the dam and intake and also remove logs and debris from around the raw water intake and dam drain gates The affected lake area extends 400 feet upstream from the dam and comprises about 12 acres While the water elevation is lowered 1 to 2 feet for dredging dam inspection and any needed repairs will also be conducted The dam is structurally sound and the only anticipated repairs are the drain gates trash rack and minor concrete repair where cracks and spalling have occurred After the work is completed and the lake refilled the dredge access trail will remain as a permanent canoe access facility for the park Page 3 of 1 l PCN Form — Version 1 3 Dec 2008 3e Describe the overall project in detail including the type of equipment to be used Site Preparation 1) Install erosion and sedimentation control measures along the construction entrance road lake access points along the northern shoreline and around the sediment disposal area 2) Improve the gravel access road as needed from Ben Johnston Rd to the disposal area and to the dredge launch area on the lake shore 160 feet east of the sediment disposal basin (Same access point used during previous dredging) Grading and gravel fill for barge access will end at the normal pool edge and will not extend into the lake 3) A second lakeshore access point might be needed ,just west of the intake pump station for lifting large submerged logs near the intake but no fill in the lake will occur 4) Remove shrubs and small trees that have colonized inside the 0 8 acre sediment disposal basin 5) Construct the floating skimmer in the sediment basin discharge pipe and riprap protected outlet north of the sediment basin Drainage water from the skimmer will discharge at non erosive velocity in a wooded upland area 110 feet from the lake and will drain downslope into the upper end of the lake just south of Ben Johnston Rd bridge Water Control, Dredgmg and Outlet Repaus 6) Install two 18 inch diameter temporary siphons along the south bank of the lake from a point upstream of the dredging area to a temporary concrete manhole collar placed in the Eno River .just below the stilling pool The middle segment of the siphon pipes will be laid on private land along the south bank (20 ft wide temporary easement) but little or no riparian vegetation removal is expected in this area 7) Using the siphons and/or pumping draw down the lake 1 to 2 feet below the spillway crest to provide a storage buffer in the event of storms and as a safety precaution for the dredge operator The siphons will be capable of passing at least 27 cfs and will be operated to ensure a continuous minimum release of 2 cfs throughout the work period 8) Install the turbidity curtain to isolate the various dredging areas (5 stages) to minimize turbidity at the raw water intake and the siphon intake The raw water intake will remain in operation throughout the project and WTP staff will be prepared to treat for elevated turbidity if necessary 9) Begin Stage 1 dredging near the dam on the right (south) side of the lake using a combination of clamshell dredge and hydraulic dredge depending on materials and amount of large debris A crane may be needed for large logs (operated from shore near the pump station) The excavated sediment and woody debris may be trucked pumped or hoisted in a container up the slope into the disposal basin 10) Remove the dam trash rack and place a temporary steel plate into the stop log slot Clean out the outlet works and inspect and repair as needed 11) Move the turbidity curtain as each dredging stage (area) is finished Vacuum or hydraulic dredging only (no clamshell) will be used close to the intake screens and structures in the Stage 2 area Move the siphon intake to the stage 1 area during the final stage 5 dredging 12) Conduct a bathymetric survey to verify that the final lake bottom contours are consistent with the dredging plan Downstream Dam Repair and Site Clean up 13) Seed and stabilize all disturbed areas outside the sediment disposal basin when dredging is completed and plant trees in Zone 1 temporary buffer impact areas A gravel path to the lake shore will be left in place for launching small boats when Kings Highway Park re opens (The park will be closed for 2 to 3 months during this project) 14) Use pumps to drain the stilling basin between the spillway and end sill pile wall Flow up to 27 cfs will be bypassed to the river below the stilling basin 15) Complete the identified joint and concrete repairs and inspect for additional repair needs 16) Allow the reservoir to refill (while maintaining 2 cfs minimum release) then remove the temporary siphons manhole collar outlet and temporary erosion and sedimentation control devices The sediment disposal basin outlet and riprap will be left in place but the only new water entering the basin after dredging is complete will be direct precipitation inside the berm (0 8 acre) 4 Jurisdictional Determinations 4a Have jurisdictional wetland or stream determinations by the Corps or State been requested or obtained for this property / ❑ Yes ® No ❑ Unknown project (including all prior phases) in the past? 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) Gerald Potters verified by Craig Brown Other RJG &A Environmental Consultants 4d If yes list the dates of the Corps jurisdictional determinations or State determinations and attach documentation ACE agent Craig Brown verified RJG &A delineation on 29 march 2012 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 NA Page 4 of 11 PCN Form — Version 1 3 Dec 2008 6 Future Project Plans 6a Is this a phased project? ❑ Yes ® No 6b If yes explain Section C Proposed Impacts Inventory 1 Impacts Summary la 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 > NONE 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 Sediment Isolated man made ® Yes El Corps W1 ®P ❑ T disposal upland depression [I No ®DWQ 0 31 acre permanent fill marsh/sapling W2 ❑ P ❑ T NA NA ❑ Yes ❑ Corps ❑ No ❑ DWQ 2g Total wetland impacts 0 31 acre 2h Comments This wetland was inadvertently created in the 1980 s by excavating an upland area to create a sediment disposal basin for maintenance dredging at Lake Ben Johnston Hydrophytic vegetation has colonized the surface of the old dredged sediment and intermittent ponding occurs in the center portion of the basin ACE agent Craig Brown verified that it is isolated and non subject to 404 jurisdiction 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 Perennial Type of jurisdiction Average Impact number Permanent Type of impact Stream name (PER) or (Corps 404 10 stream length (P) or Temporary (T) intermittent DWQ — non 404 width (linear (INT)? other) (feet) feet) S1 ❑ P ®T Temp concrete manhole collar Eno River ® PER ❑ INT ® Corps ❑ DWQ 53 ft 5 ft S2 ❑ P ❑ T ❑ PER ❑ Corps ❑ INT ❑ DWQ 3h Total stream and tributary impacts 5 ft 31 Comments A concrete manhole collar will be placed on the river bed a few feet beyond the stilling basin end wall to serve as a temporary outlet for the bypass siphons for 2 to 3 months The affected river bed area will be approximately 20 square feet The collar will be removed and the river bed restored when the project is complete 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 Page 5 of 11 PCN Form — Version 1 3 Dec 2008 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 [:]POT Lake Ben Johnston Drawdown & Dredging Impoundment 1 20 acres 02 ❑ P ® T LBJ Dam Stilling Pool Dewatermg Stilling Pool 0 12 acres 03 ❑P ❑T 4f Total open water impacts 132 acres 4g Comments The lake will be drawn down I to 2 feet for 2 to 3 months during dredging and dam repatrs The area of lake bed temporarily exposed by dewatering will be approximately 5 to 10 percent of total lake area and is not expected to affect aquatic life in the lake The drawdown will be during summer to fall 2012 long after the spawning season for most reservoir fish The stilling basin be dewatered for only a week or two to facilitate dam repairs 5 Pond or Lake Construction If pond 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 of (acres) number pond Flooded Filled Excavated Flooded Filled Excavated Flooded P1 P2 5f Total 5g Comments Not Applicable 5h Is a dam high hazard permit required ❑ Yes ❑ No If yes permit ID no 51 Expected pond surface area (acres) 51 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 you MUST fill out Section D of this form 6a ® Neuse ❑Tar Pamlico ❑Other Project is in which protected basin? ❑ Catawba ❑ Randleman 6b 6c 6d 6e 6f 6g Buffer impact number Reason for impact Stream name Buffer mitigation Zone 1 impact Zone 2 impact Perm P or Temp T required? (square feet (square feet 61 ®P ❑ T Temp dredge launch and Lake Ben El Yes 420 sq ft 220 sq ft perm canoe launch Johnston ® No B1 ❑ P ®T Temp dredge launch and Lake Ben El Yes 420 sq ft 220 sq ft perm canoe launch Johnston ® No 62 E] P ®T Temp crane pad for lifting Lake Ben El Yes 1505 sq ft 1232 sq ft large debris Johnston ® No B3 ❑ P ®T Temp bypass siphon easement (limited impact) LBJ + Eno R ❑ Yes ® No 5200 sq ft 6h Total buffer unpacts 7545 sq ft 1672 sq ft Page 6 of 1 I PCN Form — Version 1 3 Dec 2008 61 Comments B1 Temporary clearing through buffer for dredging = 20 ft wide permanent canoe access trail clearing = 10 ft wide B2 30 ft wide clearing on north bank for crane access (may or may not be needed) B3 20 ft wide easement along south bank for temporary bypass siphons Little if any vegetation removal is needed here The pipes will be laid between the trees to the extent practicable Section D Impact Justification and Mitigation 1 Avoidance and Minimization 1a Specifically describe measures taken to avoid or minimize the proposed impacts in designing project The reservoir access point for dredging will use the previous 1990s access corridor which has partially grown up in small trees but will avoid the adjacent mature riparian trees It will also avoid the lake fringe wetlands to the north The proposed crane access if needed will be adjacent to the pump station and road on the north bank and will thus minimize new buffer impacts The sediment disposal basin already exists the isolated wetland that has formed on the old sediment is unavoidable but a similar situation (intermittent pondmg and hydrophyte colonization) will likely occur on the new sediment too The floating skimmer and rock lined outflow will ensure that drainage water is low in turbidity and is released upslope of the buffer at non erosive velocity The old sediment basin berm will provide vehicle access between the park entrance road and the dredge launch area The flow bypass siphons will be laid along the south bank with as little damage or removal of riparian trees as possible and will maintain 2 to 27 cfs flow to protect aquatic life in the river The siphons will be installed from the lake no road access through the riparian buffer on the south bank is needed A temporary manhole ring placed in the river at the siphon outlet will prevent scour damage to the river bed 1 b Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques Erosion and sediment controls and tree protection fencing will be installed at the beginning of project construction The reservoir water level will be lowered only I to 2 feet which should not cause significant bank slumping Lake fringe wetlands will be temporarily dewatered for 2 to 3 months but are expected to recover quickly when full pool is restored Silt curtains will be used to isolate each area actively being dredged thus minimizing turbidity entering the raw water intake and bypass siphons A clamshell or similar mechanical dredge is expected to be used for the majority of the dredging This will require less sediment dewatering than hydraulic or vacuum dredging which will be necessary around the intake screens and dam gates to avoid damage Temporary structures will be removed disturbed land seeded and stabilized and trees replanted in zone 1 temporary buffer impact areas 2 Compensatory Mitigation for Impacts to Waters of the U S or Waters of the State 2a Does the project require Compensatory Mitigation for ❑ Yes ® No impacts to Waters of the U S or Waters of the State? 2b If yes mitigation is required by (check all that apply) ❑ DWQ ❑ Corps ❑ Mitigation bank 2c If yes which mitigation option will be used for this project? ❑ Payment to in lieu fee program ❑ Permittee Responsible Mitigation 3 Complete if Using a Mitigation Bank a Name of Mitigation Bank NA b Credits Purchased (attach receipt and letter) �ype NA Quantity NA c Comments NA 4 Complete if Making a Payment to In lieu Fee Program a Approval letter from in lieu fee program is attached 10 Yes Page 7 of 11 PCN Form — Version 1 3 Dec 2008 b Stream mitigation requested NA linear feet c If using stream mitigation stream temperature ❑ warm ❑ cool ❑cold d Buffer mitigation requested (DWQ only) NA square feet e Riparian wetland mitigation requested NA acres f Non riparian wetland mitigation requested NA acres g Coastal (tidal) wetland mitigation requested NA acres h Comments 5 Complete if Using a Permittee Responsible Mitigation Plan a If using a permittee responsible mitigation plan provide a description of the proposed mitigation plan NA 6 Buffer Mitigation (State Regulated Riparian Buffer Rules) — required by DWO a Will the project result in an impact within a protected riparian buffer that requires buffer mitigation? ❑ Yes ® No b 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 c Reason for impact 6d Total impact (square feet) Multiplier 6e Required mitigation (square feet) Zone 1 NA NA 3 (2 for Catawba) NA Zone 2 NA NA 1 5 NA 6f Total buffer mitigation required NA g 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) NA h Comments The project is for lake sediment dredging and mmor dam repairs and will not significantly affect reservoir area or capacity The project is intended to maintain the existing public water supply use The only permanent buffer impact will be converting an existing footpath (at the dredge launch area) to a 10 wide gravel trail for canoe launching Section 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 within one of the NC Riparian Buffer Protection Rules? ® Yes ❑ No 1 b If yes then is a diffuse flow plan included? If no explain why Comments The proposed construction is within and immediately adjacent to Lake Ben Johnston and Eno River and no new impervious surface will be added The sediment basin outlet is designed to discharge at non erosive velocity outside the buffer ❑ Yes ® No 2 Stormwater Management Plan 2a What is the overall percent imperviousness of this project? NA % 2b Does this project require a Stormwater Management Plan? ❑ Yes ® No Page 8 of 1 l PCN Form — Version 1 3 Dec 2008 2c If this project DOES NOT require a Stormwater Management Plan explain why No new impervious surface 2d If this project DOES require a Stormwater Management Plan then provide a brief narrative description of the plan use of public (federal /state) land? ❑ Certified Local Government 2e Who will be responsible for the review of the Stormwater Management Plan? ❑ DWO Stormwater Program (North Carolina) Environmental Policy Act (NEPA/SEPA)? ❑ DWO 401 Unit 3 Certified Local Government Stormwater Review ❑ Yes ❑ No 3a In which local government s jurisdiction is this project? Orange County 2 Violations (DWO Requirement) ❑ Phase II 3b Which of the following locally implemented stormwater management programs ❑ NSW ❑ USMP apply (check all that apply) ❑ Water Supply Watershed ,Q Other 3c Has the approved Stormwater Management Plan with proof of approval been ❑ Yes ❑ No attached? 4 DWO Stormwater Program Review ❑ Coastal counties ❑ HOW 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 attached? ❑ Yes ❑ No 5 DWO 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 Section F Supplementary Information 1 Environmental Documentation (DWO Requirement) 1 a Does the project involve an expenditure of public (federal /state /local) funds or the ® Yes ❑ 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)? 1c 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 This project qualifies as maintenance of an existing facility and is not subject to SEPA documentation 2 Violations (DWO Requirement) Page 9 of 11 PCN Form — Version 1 3 Dec 2008 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) NA 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 This reservoir maintenece project will not induce urban growth or secondary and cumulative impacts 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 This project will not generate sanitary wastewater 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? The US FWS website lists four federally endangered species in Orange County Dwarf Wedgemussel Red cockaded Woodpecker Smooth Coneflower and Michaux s Sumac The only NC NHP record of Dwarf Wedgemussel from the Eno River watershed is one dead shell reported in 1995 more than four miles upstream of Lake Ben Johnston Multiple surveys over the past 20 years in the Eno River below Ben Johnston Dam and in tributaries have failed to detect any other Dwarf Wedgemussels although the free flowing river segments look potentially suitable and several other river mussel species often found with Dwarf Wedgemussel are present Dwarf Wedgemussel does not persist in impounded waters and based on NC NHP and NC WRC records it is unlikely that this species presently occurs in or near the project impact area The proposed measures to maintain minimum flow and minimize sedimentation and turbidity below the dam will protect the other mussel species present including state protected species RJG &A biologist Gerald Pottern examined the project area for suitable habitat for these species There is no suitable habitat in the project vicinity for Red cockaded Woodpecker (extensive mature pine forest) Smooth Coneflower (glades or woodland edges on basic or mafic soils) or Michaux s sumac (dry mesic upland forest edges or thin woodlands) There is no record of these three species within five miles of the project area and no recent records (within the past 20 years) of these species in Orange County Based on lack of suitable habitat lack of nearby records and lack of any recent records in Orange County we conclude that these species and their habitats will not be affected by the project 6 Essential Fish Habitat (Corps Requirement) Page 10 of 11 PCN Form — Version 1 3 Dec 2008 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? NC DMF and NC WRC There is no designated essential fish habitat in Orange County 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? The Kings Highway Park property that includes the sediment disposal basin lies along a historic Native American trading path Tom Magnuson founder of the Trading Path Association documented the presence of remnants of a river ford and historic road known as Kings Highway on the property The Hillsborough Board of Commissioners officially opened the park to the public in May 2007 The construction plan is designed to avoid the culturally significant areas of the park and will only disturb areas that were previously disturbed during the 1980s dredging 8 Flood Zone Designation (Corps Requirement) 8a Will this project occur in a FEMA designated 100 year floodplain? ❑ Yes ® No 8b If yes explain how project meets FEMA requirements The project requires a FEMA No Rise Certification which the project engineer and Town staff are preparing as part of the Floodplain Development Permit The gravel trail to the lake that will serve as a temporary dredge launch and permanent canoe launch will be the only permanent change on the floodplain and will have no effect on flood elevations 8c What source(s) did you use to make the floodplain determination? NC Floodplam Mapping Information System Orange County digital FIRM map panel Gerald Pottern ,4w#&�7 21 June 2012 Applicant/Agent s Printed Name Applicant/Agent s Signature Date (Agents signature is valid only if an authorization letter from the applicant is provided Page 11 of 11 PCN Form — Version 1 3 Dec 2008 Of dills 1 - ol%4Tn 1 n Mr gn TO WHOM IT MAY CONCERN June 7, 2012 Re Lake Ben Johnston Dredging Protect I ake Ben Johnston Road, Hillsborough Permitting Agent Authorization Phis letter authorizes Robert J Goldstein & Associates to act as the Town of Hillsborough's agent for obtaining Section 404 401 authorization and any related environmental studies or permitting for the T'own's Lake Ben Johnston dredging projee,t on the Eno River If you have any questions or comments, please contact Kenny Keel, I own Engineer at (919) 732 1270 ext 75 or kennv keelhillsborou hnc org Sincerely nc Peterson Town Manager cc Gerald Potters, Robert J Cjoldstem & Associates Inc gpotterii(u)RJCrAcarolina com Gerald Robblee Schnabel Engineering South, PC rg obblet-u�sc bnabel eng com I aura Shearin, Schnabel Fngineering South PC, lshearin(a),,c,hnabel 0119 c.om File 101 Last Orange xStrcet 1'O Box 429 Hillsborough Voi th C,arolina 27278 919 732 1270 Fax 919 644 2390 o� .Q �I -0 I O O m J J_ I C d I n Ta D H* ! ` GIF \* TaE GeB GeB TaD.k. Hr8 TaE 4 , HrC GeC is GeB H r C .0 G C GeB F O R E S T H`rB GeC TaE Y -et=' .r est Hill 0 u T a E ` T a D HrB Ge.B GhC . >" 4, , - GeB .. TaD GeC r o f TaE- `Ch TaE GeB GeC :;''.• CeB° Ch= Chewacla loam 0 -2 %slope ~' i GeC = Georgeville silt loam 6 -10% °t Ch .• 4 E ' G�Gt HwB = Hiwassee clay loam 2 -6% K GeC TaE = Tatum silt loam 15 -25% ... HwB TaE GeC B C So Gel f1r � o TaE GeC GhC lu HwB Cp ''t - GeB \TaD { t�� TaE , GeC CP GeB Ta�Er'�' WTP HwB Ch CP t Y E Q `° r GeB C P ! � C GeBC ' GeC mtje .. QC GeB WxF d� _ A y W x F C Soil5urvey of - GIF 0 loco' Zow Oranye &u;Wy ,heet Iq r I t `,.IST;N3 ACCESS, ROAD - - i e�620 EXIST PIG DI REASAL 1 1 1 1 1t t! 1\ tf t 14/ t I t 5 1111 1t1'`. I a i l l ) 1 \i�fl t �,�,,t� .,t1, 1 11t'tt' • tt � / J ! t •� ✓� \ \� I 1 � i t ' � � PICNIC AREA ro.\,.,, \ \�� \��\ ter! hf/ � /i� •app '- r /r / / / / / / /// . t •'.�\ \� � _�. -gip• .',r,;�- ,, a, / // i / y i IYa -ATN 1 i d `7i�9O1t � O"hAIdO f` %r r i s• ., � i ,. ,' M 1 s 3 �% � s }. MOAOMiOK�+ �k/1iMllOil �o Pa Ag � ° �►� use safe( W y` 1 / z p 8+ ob oke V? JAG jE AM . a 4c'$ ' 'f �C 7 _J; I tug P Y / ¢ c -- 1A > e, u ti� so a LAI ) d CT i A ro�•� j w ,n Ali 1 I h •' >� 00 440 �N 4 i x all ry !if O tS r C.� i^ l 1 ye � H V+' v 1 s a � } I O A N. CIO r Qy � . • 4f 0 2� V to a cE 00 Z u _H V C � y 0 /-AZ r a �4 Go N. CIO r Qy � . • 4f 0 2� V to a cE 00 Z u _H V C � y 0 /-AZ r m r ch 'G o O ti 0 .- a C3► E 3:.o r a y l Uji i i 3 1^ .� 014 _ 40 Go d� sGyo �m 0. a �j QQ r H H 0 P' a N . E � Cr a h W Y 11 11 y ' �Cf 1 J N �Ob, O O mNN P 0S 4M ' ....rte.... m r ch 'G o O ti 0 .- a C3► E 3:.o r a y l Uji i i 3 1^ .� 014 _ 40 j H � w E E v � � Rt = = N %n Y it M j N �- m d O O `N N W rw, t r r � a r 3w -v J a) s V• looe 'oo�/ �\L . / r�R� �.1�, }y- • s i• 4 "tir 4 • c a. i E 4. CO) \I /ti 1© d a wF cr CL 0 E p, to N. • - : y+ ''' N O c rj r W �a J' W r r P l t d2 m L M� L .A s� QV � N �a J c� _ /Opp vk�N ti 1 a 6 i p � 2 z C§ ml `s wl o a= o z ° —01 r S f CY u 2 z C§ ml `s wl o a= o z ° —01 r S f CY f PF \ / AI- `f i SUFFER +]CY4t OF }3 RV � R TOP OF RESERVOIR BOTTOM AFTER SEDIMENT AND DEBRIS REMOVAL f a° C+ N ° O a p0pp A N N N N N V O m o t°O C) C) + \ ° Z a o O M w N L o ° U) w fn LL ° O LL Z a Z 0 00 0 F U' � o O ❑ U N C) / 0 W j 0 w Y U) / a a w N �C , . / I, � o m V m N O o m ° m ti N N N N N V V V O O O O O O O N U N N -4 V It 0 w f_ O I � I N � o v o I( 0) \\ O N w I o ❑ I a o i I LL LL % Op_ o 0 I ~ ~ N U t a M N I ( w �S w 110w �w2 o 0. i5 N U) o ° - I n 0 m O O O O O O O O N N N N N '7 IT .f O LO z O Q Q O U W U) w OD \ O to Z O W N ❑ o W d U) LL O ° M IL O (7 O % N H 2 � J ❑ F- O W Z Uow Ix 2 _o a ai ° / N M I ° 1 ° N I 40 r 0 m O O O O O O O O V N N N N Y .} V O O O O O O O O w Cl) to it) U) W) u°) a v a 0 m 1° I I ° " I v O 1 M 1 N U) o O EL O o 0 OF f-P o Z �< J t~n ❑U N $ IL �0 w ° / Qww / I / no O O O O O O O O N N N N 1°(I -It a OD rl O 1C) V + (') O Q U) Q O U W U) 0 0 N Z O Q O U W U) so} M N O O O°I p °ppp r N N N N N V' \ to 1 O 1 O 10 N w o w M U LL O 0 LL LL O ¢ N O Z J W f~!1 w ° X U W o o a (o N / 1 $ 4 in 1 0 o f°f N O O oo ro o N N N N N It Q } 0 0 N ° O 0 0 a N N N N N V a IT 0 m �n I I N I � o v \ � M \ N w ri 1j w° U LL I o O ILL Z LL 00 0 I~a N J Q ,wicq / ° 1 $ I LLo � w U o / I 1 � o m m a°o I? N N N N N v a It O + a •/J Q U 0 N Z vJ Q U W /I�Ir 114 (awl e .,wY A� f 1 kf5 IlitaIAPK AM)1 FlrfyYfAJ`I ( katM *a hmN it 141" t3 t f►In a 1 CA U4c (. A ai�C h:{t ti l — x11 Trn FAAAar E lkefX T I+- 'IImr dlJ=l mij 3 1 ARMORED AUXILIARY SPILLWAY TYPICAL SECTION _i 7tt )d e v All — &v1C 4 4 i SKIMMER BASIL FILTER DIAPHRAGM r ern ,o srxl .s gv 4 � tM. u 1 If w fv -f 10 MI) VIE dt rgow tiorw r�t,Fre�tn� rrsFVr ` ' SKIMMER DETAILS I411 11 IAIII Cxlt n ►lam Ule� e r a k 1 c V 4 ti 0 u1 z r- Ih z z �r m { � ( Jlti�O Rg❑ ttIC7A}tlS7Fi rfVl'7i FJ01SNFiC)f td 3F� E^ w4 r h u` ( r Y� 7 ✓ti r N $_ fi 2 �d i I i 0 I u I z � � h I Y L Vi� t I rV x" I � E �J n 9 �5 �i K l7 f 'Mk 1 f I I g ' t I� f {lo l� 1 J K ti t a� tj.� �I QI f� sF �G VI Ln I a fFI wv } (A Up r arty A6 Afro II" A_ST V L HAVE J,hSt"to ffil N R1 AF' 1.? (CIA aT 11: r1 `i iLll'>GY.�#'i 1 B Too Of a 1 1 I Net Prs I-WIF $kit fit of A l I I A l 1 Rr"a`Jq 111 rem tit 1w4 Volk 04 0 1 car I� willtINct1',Ot P1 His d t ra^rm F dr�1714fAtC i t ff i t nrttr �, r IUI'C# Ab �) ,AA HLR arZ:)NE c �E T t � 1 FIi IE14 I-AMR C4% HOW 3 NA t WAY 0 iwhI.K1trA,(if EiJFt tp,kf IIP�k tit TExFAIIS"N TIM Nt-4 Nil kAAr*4f f ,III .c r T )% it w 7 'A VA RrATTRi fix) ffa j Fm we tat F 11(k P I MkkIt, Milit1lia1W1.41.14K54P (it MIO&I (Ali iL1 i7(anTAir15 A I14&X4 APWf t- lq F Ald It I t m1. A t 1 Luvo to i � `) olft Lit wAi1 I� w k tPJ Sit N 'lY A01Li 11V qtr a471c4 I Y p I rr�.�lr SILT FENCE OUTLET IT ArTr71 101 if) q,A.tr Iii NCt .1AW ( LOTH "*s YHI w If (1 I{ !E �E y+ l F { AAPRO JVAll FOJ QR SFO OF-41 { M-MSTRrAM OF CRAW MAN ill mf %l t (16t 1 t WVL t { tG r 1�! C1 Y{*i A4t avr tx (U.Tr4 JA vF' L NKb: v ft Vi i SECTION THROUGH DAM AT STOP LOG SLOT i )lr sarFC m w o too r as sN ylnt i p"t )Woi t (.N rt k! WOMMIGil UNPPk SSA E .( 1S Stt'Ft I 1= VMfEpttGtl tkJt*RrSSi1tL f '1NFftf(,tk! 7i p rx wn fw&w NG roo p J id t n ne { 2 ' STOP LOG SLOT PLAN i ( ry AW, 77t fy EEEM=3 I mom� BONI a 3 1�" sl ■ ■ 1 t' ' 1 PLAN OF KNOWN CONCRETE REPAIR AREAS f Oyf' ADGITt1. wAd « ,AAAM RFP&,kAQCA, %A A'r SC AXWO to Tldr m t�fr ,; raLoc.1FfTv^ rXI rg4c CF I t rF n f n rd71 ro ,, rux r mr RFAI 1 NQe 1 f t'I YvMt1C,'0 JR M" Al F A-M Vrl/RFb s f U Ltf E M04e*A jd !.d M', ME "t"t XI 9 W Y$R -M7k t -it W4iQ- LWi ;tWM I W Ntl W 0 N 6 w 11WX%C* +a A9VA I,.MN W _*W Wv*'0 0.6 li C rk1ty? C nlC kca*AA kJ14h LAt Otc r3l6aJS*aR'fi 4014 'Ultl4k TY 40AWILWA t"665544tV SAY#- YS'."&U�. (It AMAII(A E ¢ r? �+. -.,+ "96t A'c tI�V4 t>r! It 44ax f -W A WQA �Fi*Mkk AfS.a* T 6A'M A LIKAX,a Or LK Df ,." IA Cvo 4t:1 I1 R to .w t tt,2 r' 'S.@LV k +'Wxt o*-A S, ►LLt%:R�NIAtr I'C.t1 1 .w -�3t WKJt t°`WI �4f f,� ft 4.s+S.O9 I �+ tm' CJV V'+KL7t r' '4 R itk'�`ANi AkiA k*tf r7 IJU AW M.. L ^C7aR it 0,L'.'M.f+ .vfty4 FI'Awn INS w t mow N n¢ t `q %4%t c* -da ftfilkMT LL t4,6 t � *#�.* 1 k WAI Oft 4 AI to J'Y T40 +c*tft acid 00A.1 A&P .4 t A sir A PC B 09 A Q Its A,•YTNV Vo Ltd r_c.) ,3"A PUli t ,O I ta.1f a PIJAJ e tFSLaAArx.1�iW�� 1S+viL43fA�tlMAlml p{FrF f-MIJ' EF*+h I FtPst tNt ?iii t M A c -rid kiiFE3 @tttitll' 9$ SR M t 'A _mvA &ft M.,Y.+Y tW d CW.s'4 RLkAfR KAI C of lIl i l `�sl P+"tALF7k1WA4l 7t aT:a.`z$8 Kir'i taE 'ef5�a+t �'W r4t It mw.t rOQ[P+vn Ah rT«>vr ffli thrr_,1c #k i K. FW Ift * t)d#4Mt*k log 14*AV_^)fl WAM It* CW W- &AIib &I nAf *k i 3+`+ i4Al tl t �sPB6i�R1 LA I sAIR hv) a ozA 10 16w dM nhw VAS; *w 11 r ro*.mia: rij.RJNI T kAwIlir oK.A c40 t Toe Mp41Li 041f OA4 L I MW WA A)1LitrA k.Alltt R V7XA r W 1'14;10 dt 4 OIL i t'b.WIMS LI R IN r1N ►a +a AF sr..Cn4AAA2GRcil" 01' I rlAIMAAQ VJ @n A, t E,9at AM ka i.d itA 1tt ¢ mAt f 1%,At F (N A TA IL MiLW t i t i 4AI &`E" If Y! 1 .d t' At 14 we "e, , ac f N h% Amt it N C CW M K'w q 4 LL v4t( `" Aslftlr. -p i' rtetfrw rk.c^ -mr r Am V,wl+, 1 LI T C Pltt),W4iTe i RTPAAnA rf'M AJA&f I,7 'kD F S1?`�.Zt1 " *VCjj [`A "A VO-IN 's.A 79 kk Iu+A&NF I ) A f4 CyAJENI I,l04VIv f g k F NM.11v Fn IR a `rsk M3 1 "I tier .k L. " 11"T I MA.td,tA„t AFAjjFD tii'.,Yr tHA NOTES L M D w ou A LY JL W.NnivP 1 A f 1 1 LLRL 6L Wr 1" M 1 i`Ai$ +El m. it low m:l 9g.^'f 'Qel f*y m It It w A M11`(;' b" *04 r.0 Yti' a M L"t .� 41W t Hd lint to Q ✓�. na'n.J REPAIR PROCEDURE FOR CONCRE` SPAL'S � RE - Ai 9t} td Ad ft 411 NOTES F, IILF.xt: J&A LSIL4 IlI r *att:ii rye" M rCk i'�lVNUktt t 1 6TtfrenJ,rkgi i LAW S 4 1 A I u Of Tai t51hM 19 Y Tilt Ada 6 34 8 t 044 IV k.r r tit If 1 4%.1 K ki'(411tj Fr ri G 1+ I 44;: it � x�~t1111 lolfxltr E K I < 11.t 0 111 1 hrrd" C (.41a K"W d Irlol) 510A,tLC 1h — — _ ZFtvA?*'rO§kZ'(Y AEO P111 .E` 114 "t ) or .*..% ICI "r 4,0rr'ir prl c(A't M0.; f 6, W •.T h? AF•tAigjr I n 8 % p txgl6E'm 1 it A"W61 ttt I ti At OV L _Wft fl Ar*" li"tLk ! a rv* it ry 1 $ a �f W" f ) met, I* t If a �.. A 3'3301911V" OE tMMLXKWtltY UVA110WIT 1 1 0631 J'=UWAV nl'W'..: r rd Air CVa iMWt +*L P Ali t It 103 .fill 'gst*%T uD4AII M 01%"i rlt R IteWr4:) .1•Jrh T$IitMltl. �l + 14 k0,4€i L) t1.4u°RtTt ira t..ti++' -N.iMt W*rauP+n Al ama^'xYr "*.1L Ar it +Y'"mt t ;3,ajiF 4ia,k tsl<,i.+f*aS' , t1n.k• wcl �' xi kmk kF' f• at fl itfr-' 914 v - ftlfS'16 T r tr'40 TA 4f%k,!Z NO III, —eZL �� r f i ttt�f Aa7ag a Air! R REPAIR PROCEDURE FOR ISn NG J� I WS 1K" 10 SALE 4xirtlm 6 w AM — CRN'. ?.ul TO FW � r—ROCIVE'rt 361d1a G T VitkCkM 0 R kLUWi F44IS14 F A I .11 INN 10.kCx NOTES KAk*4 6k-04A h► T 'Ka' 4 4 r k i0il I V r :Z0 AreT".e$OUT n,�, N t P.1 144 tvk% Mite &A19 A Afa 4; T'I s 44OAWs 1 AJOJZ > 6# _ lhW Ut ON, to t i OALS33 MAbk V4 igPOJ V .1 WA ITI 1 1 1 1 3 C M D E tav 01 It I T 1 It: a W Ail k 's &a .,�# ISiit,,.,4.Y1 fiT S"'f Y It�.B F7 A.G+rt .....'� nti i.iLGi W4�It'I A•S ,id1Y '3'Y �Yf 1 te..�ras�'t"oi _REPAIR PROCEDURE FOR CRACKS NOT SUBJECT TO OVEMENT