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HomeMy WebLinkAbout20070291 Ver 1_401 Application_20070207v1-o291 LMG LAND MANAGEMENT GROUP irrc. February 13, 2007 Environmental Consultants ~~~~~~~ ~~~~ TO: Mr. Keith Harris U.S. Army Corps of Engineers P.O. Box 1890 Wilmington, NC 28402-1890 RE: NWP 12 Application; King's Bluff Pump Station Bladen County, NC Dear Keith: Enclosed is a NWP 12 application for your review. This application is submitted on behalf of the Lower Cape Fear Water and Sewer Authority for the installation of a 60-inch water intake pipe at the existing King's B1uffPump Station in Bladen County, NC. This pipe is part of a capacity upgrade at the pump station to account for increased water demands resulting from recent population growth in coastal North Carolina. The intake pipe will be approximately 1,100 LF in length and will extend from the Cape Fear River to the pump station. Approximately 800 LF of piping will traverse wetlands with a 40' wide construction corridor, resulting in approximately 0.721 acres of temporary wetland impacts. In addition, approximately 0.222 acre of open water within the Cape Fear River will be temporarily impacted. To mitigate for these impacts, the applicant will place all wetlands, except that located within a 20' maintenance corridor, into preservation. The Pre-Construction Notification form, associated maps, and site plan are enclosed for your review. Please note that this project may require the preparation of an Environmental Assessment. The applicant is asking the Corps and DWQ to review the project information and provide this determination. Please contact me if you have any questions. Thank you for your assistance with this project. Sincerely, Kim Williams Wetland Scientist Encl. C: Mr. Don Betz, Lower Cape Fear Water and Sewer Authority Mr. Tony Boahn, McKim & Creed Mr. Ken Averitte, DWQ Mr. Ian McMillan, DWQ www.lmgroup.net • info@Imgroup.net • Phone: 910.452.0001 • Fax: 910.452.0060 3805 Wrightsville Ave., Suite 15, Wilmington, NC 28403 • P.O. Box 2522, Wilmington, NC 28402 ~~D11 °TES~ CC)~'~ Office Use Only: Form Version March 05 USACE Action ID No. DWQ No. ~ -] - ~ z-~ (If any particular item is not applicable to this project, please enter "Not Applicable" or "N/A".) I. Processing 1. Check all of the approval(s) requested for this project: ® Section 404 Permit ^ Riparian or Watershed Buffer Rules ® Section 10 Permit ^ Isolated Wetland Permit from DWQ ^ 401 Water Quality Certification ^ Express 401 Water Quality Certification 2. Nationwide, Regional or General Permit Number(s) Requested: Nationwide 12 3. If this notification is solely a courtesy copy because written approval for the 401 Certification is not required, check here: 4. If payment into the North Carolina Ecosystem Enhancement Program (NCEEP) is proposed for mitigation of impacts, attach the acceptance letter from NCEEP, complete section VIII, and check here: ^ 5. If your project is located in any of North Carolina's twenty coastal counties (listed on page 4), and the project is within a North Carolina Division of Coastal Management Area of Environmental Concern (see the top of page 2 for further details), check here: II. Applicant Information Owner/Applicant Information Name: Mr. Don Betz Mailing Address: Lower Cape Fear Water and Sewer Authority 1107 New Pointe Blvd. Suite 17 Leland, NC 28451 Telephone Number: (910) 383-1919 Fax Number: E-mail Address: N/A 2. Agent/Consultant Information (A signed and dated copy of the Agent Authorization letter must be attached if the Agent has signatory authority for the owner/applicant.) Name: Kim Williams Company Affiliation: Land Management, Group, Inc Mailing Address: P.O. Box 2522 Wilmington, NC 28402 Telephone Number: 910-452-0001 Fax Number: 910-452-0060 E-mail Address: kwilliams(a~~group.net Updated 11/1/2005 Page 1 of 8 III. Project Information Attach a vicinity map clearly showing the location of the property with respect to local landmarks such as towns, rivers, and roads. Also provide a detailed site plan showing property boundaries and development plans in relation to surrounding properties. Both the vicinity map and site plan must include a scale and north arrow. The specific footprints of all buildings, impervious surfaces, or other facilities must be included. If possible, the maps and plans should include the appropriate USGS Topographic Quad Map and NRCS Soil Survey with the property boundaries outlined. Plan drawings, or other maps may be included at the applicant's discretion, so long as the property is clearly defined. For administrative and distribution purposes, the USACE requires information to be submitted on sheets no larger than 11 by 17-inch format; however, DWQ may accept paperwork of any size. DWQ prefers full-size construction drawings rather than a sequential sheet version of the full-size plans. If full-size plans are reduced to a small scale such that the final version is illegible, the applicant will be informed that the project has been placed on hold until decipherable maps are provided. 1. Name of project: Kings Bluff Pump Station Expansion 2. T.I.P. Project Number or State Project Number (NCDOT Only): 3. Property Identification Number (Tax PIN): 4. Location County: Bladen Nearest Town: Riegelwood Subdivision name (include phase/lot number): n/a Directions to site (include road numbers/names, landmarks, etc.): The project is located at Lock and Dam #1 in Bladen County NC. From Wilmington take US 74 W towards Brunswick County US 74 will merge with NC 87. Take a right and head North on NC 87 where 74/87 splits Take a right onto Lock Number 1 Road in Bladen County. Veer left at the end of this road Property will be straight ahead at 246 Private Road. 5. Site coordinates (For linear projects, such as a road or utility line, attach a sheet that separately lists the coordinates for each crossing of a distinct waterbody.) Decimal Degrees (6 digits minimum): 34.40409 N. 78.2965 W 6. Property size (acres): approx 6 8 acres 7. Name of nearest receiving body of water: Cape Fear River 8. River Basin: Cape Fear River Basin (Note -this must be one of North Carolina's seventeen designated major river basins. The River Basin map is available at http://h2o.enr.state.nc.us/admin/maps/.) 9. Describe the existing conditions on the site and general land use in the vicinity of the project at the time of this application: The site currently houses the King's Bluff Pump Station Updated 11/1/2005 Page 2 of 8 with three (3) raw water pumps and one 48-inch pipe that extends from the pumping station to the Cape Fear River Land use in the vicinity is lamely agricultural or undeveloped. 10. Describe the overall project in detail, including the type of equipment to be used: The applicant plans to install a 60-inch parallel intake pipe on ig natin ag t the pumpin fg acility and ending in the Cape Fear River. The intake pipe will be approximately 1,100 linear ft. Approximately 800ft of piping will traverse on-site wetlands with a 40 ft construction corridor resulting in approximately 0 721 acres of temporary wetland impacts. A track hoe and bulldozer will be used to create the installation area and then restore to existing grade. Silt fences will be used to reduce erosion into adjacent wetlands and the Cape Fear River. 11. Explain the purpose of the proposed work: The additional pipe is part of a capacity up rg ade at King's Bluff Pumping Station to account for increased water demands resulting from recent population growth in Coastal North Carolina. IV. Prior Project History If jurisdictional determinations and/or permits have been requested and/or obtained for this project (including all prior phases of the same subdivision) in the past, please explain. Include the USACE Action ID Number, DWQ Project Number, application date, and date permits and certifications were issued or withdrawn. Provide photocopies of previously issued permits, certifications or other useful information. Describe previously approved wetland, stream and buffer impacts, along with associated mitigation (where applicable). If this is a NCDOT project, list and describe permits issued for prior segments of the same T.I.P. project, along with construction schedules. The 404 wetland line was delineated by Land Management Group, Inc. in August 2006. Liz Hair of the U.S. Ar1nYCorps of Engineers field approved the wetland line. V. Future Project Plans Are any future permit requests anticipated for this project? If so, describe the anticipated work, and provide justification for the exclusion of this work from the current application. No additional wetland impacts are anticipated on this site. VI. Proposed Impacts to Waters of the United States/Waters of the State It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to wetlands, open water, and stream channels associated with the project. Each impact must be listed separately in the tables below (e.g., culvert installation should be listed separately from riprap dissipater pads). Be sure to indicate if an impact is temporary. All proposed impacts, permanent and temporary, must be listed, and must be labeled and clearly identifiable on an accompanying site plan. All wetlands and waters, and all streams (intermittent and perennial) should be shown on a delineation map, whether or not impacts are proposed to these systems. Wetland and stream evaluation and delineation forms should be included as appropriate. Updated 11/1/2005 Page 3 of 8 Photographs may be included at the applicant's discretion. If this proposed impact is strictly for wetland or stream mitigation, list and describe the impact in Section VIII below. If additional space is needed for listing or description, please attach a separate sheet. 1. Provide a written description of the proposed impacts: The applicant~roposes to temporarily impact 0 721 acre of 404 wetlands and 0.222 acre of open water for initial construction of water intake pipeline 2. Individually list wetland impacts. Types of impacts include, but are not limited to mechanized clearing, grading, fill, excavation, flooding, ditching/drainage, etc. For dams, separately list impacts due to both structure and flooding. Wetland Impact Site Number (indicate on map) Type of Impact Type of Wetland (e.g., forested, marsh, herbaceous, bog, etc.) Located within 100-year Floodplain (yes/no) Distance to Nearest Stream (linear feet) Area of Impact (acres) 1 Excavation/Fill (Temp) forested yes 0-900 ft 0.721 Total Wetland Impact (acres) 0.721 3. List the total acreage (estimated) of all existing wetlands on the property: approx. 5.4 acres 4. Individually list all intermittent and perennial stream impacts. Be sure to identify temporary impacts. Stream impacts include, but are not limited to placement of fill or culverts, dam construction, flooding, relocation, stabilization activities (e.g., cement walls, rip-rap, crib walls, gabions, etc.), excavation, ditching/straightening, etc. If stream relocation is proposed, plans and profiles showing the linear footprint for both the original and relocated streams must be included. To calculate acreage, multiply len>;th X width, then divide by 43,560. Stream Impact Number (indicate on ma) Stream Name _ Type of Impact Perennial or Intermittent? Average Stream Width Before Impact Impact Length (linear feet) Area of Impact (acres) n/a n/a n/a n/a n/a n/a n/a Total Stream Impact (by length and acreage) 5. Individually list all open water impacts (including lakes, ponds, estuaries, sounds, Atlantic Ocean and any other water of the U.S.). Open water impacts include, but are not limited to fill_ excavation. dred~in~. flooding, drainage, bulkheads, etc. Open Water Impact Name of Waterbody v Type of Waterbody Area of Site Number (if applicable) Type of Impact (lake, pond, estuary, sound, bay, Impact (indicate on ma) ocean, etc.) (acres) i Cape Fear River Excavation/ fill (temp) River 0.222 Total Open Water Impact (acres) 0222 Updated 11/1/2005 Page 4 of 8 6. List the cumulative impact to all Waters of the U.S. resulting from the project: Stream Impact (acres): 0 Wetland Impact (acres): 0.721 Open Water Impact (acres): 0.222 Total Impact to Waters of the U.S. (acres) 0 Total Stream Impact (linear feet): 0 7. Isolated Waters Do any isolated waters exist on the property? ^ Yes ®No Describe all impacts to isolated waters, and include the type of water (wetland or stream) and the size of the proposed impact (acres or linear feet). Please note that this section only applies to waters that have specifically been determined to be isolated by the USACE. 8. Pond Creation N/A If construction of a pond is proposed, associated wetland and stream impacts should be included above in the wetland and stream impact sections. Also, the proposed pond should be described here and illustrated on any maps included with this application. Pond to be created in (check all that apply): ^ uplands ^ stream ^ wetlands Describe the method of construction (e.g., dam/embankment, excavation, installation of draw-down valve or spillway, etc.): Proposed use or purpose of pond (e.g., livestock watering, irrigation, aesthetic, trout pond, local stormwater requirement, etc.): Current land use in the vicinity of the pond: Size of watershed draining to pond: Expected pond surface area: VII. Impact Justification (Avoidance and Minimization) Specifically describe measures taken to avoid the proposed impacts. It may be useful to provide information related to site constraints such as topography, building ordinances, accessibility, and financial viability of the project. The applicant may attach drawings of alternative, lower-impact site layouts, and explain why these design options were not feasible. Also discuss how impacts were minimized once the desired site plan was developed. If applicable, discuss construction techniques to be followed during construction to reduce impacts. The temporary wetland and oven water impacts are necessary to access the Cane Fear River for water intake purposes. After the pipe has been installed, the area will be returned to natural grade and allowed to revegetate. The construction corridor has been reduced to 40' in width to reduce initial wetland impacts. Updated 11/1/2005 Page 5 of 8 VIII. Mitigation DWQ - In accordance with 15A NCAC 2H .0500, mitigation may be required by the NC Division of Water Quality for projects involving greater than or equal to one acre of impacts to freshwater wetlands or greater than or equal to 150 linear feet of total impacts to perennial streams. USACE - In accordance with the Final Notice of Issuance and Modification of Nationwide Permits, published in the Federal Register on January 15, 2002, mitigation will be required when necessary to ensure that adverse effects to the aquatic environment are minimal. Factors including size and type of proposed impact and function and relative value of the impacted aquatic resource will be considered in determining acceptability of appropriate and practicable mitigation as proposed. Examples of mitigation that may be appropriate and practicable include, but are not limited to: reducing the size of the project; establishing and maintaining wetland and/or upland vegetated buffers to protect open waters such as streams; and replacing losses of aquatic resource functions and values by creating, restoring, enhancing, or preserving similar functions and values, preferable in the same watershed. If mitigation is required for this project, a copy of the mitigation plan must be attached in order for USACE or DWQ to consider the application complete for processing. Any application lacking a required mitigation plan or NCEEP concurrence shall be placed on hold as incomplete. An applicant may also choose to review the current guidelines for stream restoration in DWQ's Draft Technical Guide for Stream Work in North Carolina, available at http://h2o. enr.state.nc.us/ncwetlands/strmgide.html. 1. Provide a brief description of the proposed mitigation plan. The description should provide as much information as possible, including, but not limited to: site location (attach directions and/or map, if offsite), affected stream and river basin, type and amount (acreage/linear feet) of mitigation proposed (restoration, enhancement, creation, or preservation), a plan view, preservation mechanism (e.g., deed restrictions, conservation easement, etc.), and a description of the current site conditions and proposed method of construction. Please attach a separate sheet if more space is needed. Remaining wetlands on site (not including_pipeline corridor, will be preserved. This will be approximately 4.37 acres of riparian wetlands. 2. Mitigation may also be made by payment into the North Carolina Ecosystem Enhancement Program (NCEEP). Please note it is the applicant's responsibility to contact the NCEEP at (919) 715-0476 to determine availability, and written approval from the NCEEP indicating that they are will to accept payment for the mitigation must be attached to this form. For additional information regarding the application process for the NCEEP, check the NCEEP website at http://h2o.enr.state.nc.us/wrp/index.htm. If use of the NCEEP is proposed, please check the appropriate box on page five and provide the following information: Amount of stream mitigation requested (linear feet): n/a Amount of buffer mitigation requested (square feet): n/a Amount of Riparian wetland mitigation requested (acres): n/a Updated 11/1/2005 Page 6 of 8 Amount ofNon-riparian wetland mitigation requested (acres): n/a Amount of Coastal wetland mitigation requested (acres): n/a IX. Environmental Documentation (required by DWQ) 1. Does the project involve an expenditure of public (federal/state/local) funds or the use of public (federal/state) land? Yes ® No ^ 2. If yes, does the project require preparation of an environmental document pursuant to the requirements of the National or North Carolina Environmental Policy Act (NEPA/SEPA)? Note: If you are not sure whether a NEPA/SEPA document is required, call the SEPA coordinator at (919) 733-5083 to review current thresholds for environmental documentation. Yes ^ No ^ To be determined by regulatory agencies 3. If yes, has the document review been fmalized by the State Clearinghouse? If so, please attach a copy of the NEPA or SEPA final approval letter. Yes ^ No ^ X. Proposed Impacts on Riparian and Watershed Buffers (required by DWQ) It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to required state and local buffers associated with the project. The applicant must also provide justification for these impacts in Section VII above. All proposed impacts must be listed herein, and must be clearly identifiable on the accompanying site plan. All buffers must be shown on a map, whether or not impacts are proposed to the buffers. Correspondence from the DWQ Regional Office may be included as appropriate. Photographs may also be included at the applicant's discretion. 1. Will the project impact protected riparian buffers identified within 15A NCAC 2B .0233 (Meuse), 15A NCAC 2B .0259 (Tar-Pamlico), 15A NCAC 02B .0243 (Catawba) 15A NCAC 2B .0250 (Randleman Rules and Water Supply Buffer Requirements), or other (please identify )? Yes ^ No 2. If "yes", identify the square feet and acreage of impact to each zone of the riparian buffers. If buffer mitigation is required calculate the required amount of mitigation by applying the buffer multipliers. Zone* Impact (square feet) Multiplier Required Mitigation 1 3 (2 for Catawba) 2 1.5 Total * Zone 1 extends out 30 feet perpendicular from the top of the near bank of channel; Zone 2 extends an additiona120 feet from the edge of Zone 1. 3. If buffer mitigation is required, please discuss what type of mitigation is proposed (i.e., Donation of Property, Riparian Buffer Restoration /Enhancement, or Payment into the Riparian Buffer Restoration Fund). Please attach all appropriate information as identified within 15A NCAC 2B .0242 or .0244, or .0260. N/A Updated 11/1/2005 Page 7 of 8 XI. Stormwater (required by DWQ) Describe impervious acreage (existing and proposed) versus total acreage on the site. Discuss stormwater controls proposed in order to protect surface waters and wetlands downstream from the property. If percent impervious surface exceeds 20%, please provide calculations demonstrating total proposed impervious level.. The proposed project will not result in increased impervious surface cover~e A stormwater plan is not required. XII. Sewage Disposal (required by DWQ) Clearly detail the ultimate treatment methods and disposition (non-discharge or discharge) of wastewater generated from the proposed project, or available capacity of the subject facility. There will be no additional wastewater resulting_from the proposed project. XIII. Violations (required by DWQ) Is this site in violation of DWQ Wetland Rules (15A NCAC 2H .0500) or any Buffer Rules? Yes ^ No Is this anafter-the-fact permit application? Yes ^ No XIV. Cumulative Impacts (required by DWQ) Will this project (based on past and reasonably anticipated future impacts) result in additional development, which could impact nearby downstream water quality? Yes ^ No If yes, please submit a qualitative or quantitative cumulative impact analysis in accordance with the most recent North Carolina Division of Water Quality policy posted on our website at http://h2o.enr.state.nc.us/ncwetlands. If no, please provide a short narrative description: This protcect will not provide access to other tracts. The applicant proposes to preserve remaining wetlands on site. XV. Other Circumstances (Optional): It is the applicant's responsibility to submit the application sufficiently in advance of desired construction dates to allow processing time for these permits. However, an applicant may choose to list constraints associated with construction or sequencing that may impose limits on work schedules (e.g., draw-down schedules for lakes, dates associated with Endangered and Threatened Species, accessibility problems, or other issues outside of the applicant's control). ~ Applicant/Agent's Signature Date (Agent's signature is valid only if an authorization letter from the applicant is provided.) Updated 11/1/2005 Page 8 of 8 L•i Y` ~ ~/ ~' e~r0~/~I Point `~. ~ ~ ` ' ~ ~ Kpp ~ -- Y,. j Zara - - -`~ w ~ „ ~ --. ~ yep .,~` t ,,,, ~ ~i- „'-~ "~.-~. ~- ,r•` ~ ~` _ SITE " f~~ - ` ..r-.=~--- ` `\ ~ ~ 4 a„ ~o Y P9 ~,r,_ 'y r ~ ~ Q .,,~. . ~- t . ~. _ r. _' " 3t 1 ~ Pf ~~ ~ ~ ~!J ~ _ - . ES ~~ , a ~~I j ~N~ ~,~ ~ , ~. mil= Q ~ ~~ s _ _ ., ------~ - 87 ~ +~, i ` ,- FLT 1 ~ 2;, "Boundaries are approximate anct are SITE riot rrreant to be absolute. '__Na u~~~~r~~ ~i SCALE 1" = 1 Mile Map Source: North Carolina Atlas ~ Gazetteer. Pg 83.2003 King's Bluff Pump Station LMG Figure 1 Bladen County NC LAND MANAGEMENT GRUUY inr_ 40-06-477W fnvironmentnl Conzulfnnts Vicinity Map Jul 2006 ....... -t ~t.,... '. .. "ik ,o: ~. jI~ } t ... _ _ ~.... _ ._. .... .-~-.° ._ - -i.. _ _ y_ . ..-.. _ . ~,. _ . ..... _.,. _ _~. i ~..-SITE _ w -- _-__ ~ ,_ _~~ n ~ - , ,~ _ _ ~ ~{ ~ J ~' ;. ,. p ..... ,_ , `~ ,. r , k~,, ;" _, _~ ~ - ~, . _ ~_ ,~ ' -- ~~ ~ ,. t. ,. ~, ~ ~ '' „' 1 , j ~ ' 5.... ~ ..; ~ ~ r ,- .. a r • ' ' '' 4 ! M .,r ,~ ~. ~ ti j , _ , _ .. ~ f ," ~ ~ ;' 1 tip, t . '~ ~~ , .,cS3 'y y ,fr ~~ ,~ `Baur~daries are apprc~xirnate and are SITE -tn'.~rE~Q~~= ... ~, riot meant to he absolute SCALE 1" - 1000' Map Source: Kelly Quadrangle 7.5 minute (topographic) 1990. King's Bluff Pump Station LMG Figure 2 Bladen County, NC LANAMANAGEMENTGROUYmc USGS Topgraphic Map 40-06-477W Environmentnl Consultc+nts Jul 2006 k ~_ _ r .,._-. -~ l~ ~0 1 *Boundaries are approximate and are ~' not meant to be absolute. Map Source: 1998 NAPP aerial photography King's Bluff Pump Station Bladen County, NC 40-06-477W SITE DEl~R - L`~':Oi' a~~.~n Sim [~Tf~:' LMG LAND b1ANAGEMENT GROUP me Environmental Consultants SCALE 1" = 300' Figure 4 Aerial Photograph <<,<, ~~ nx' - 404 Wetlands Line v' / ~` e +"~ +/ s .1-.h..~...~„ t _,`, y ` "4 --,. '~, ._ ~_ _ Y Yi ~. . i fl~.- r / ~ H 1' I _. _ / ,, it _.'." '~L'-.- use 1 t'r f ~ 'Y--'~ - -._. s i ~ ~ ill 4u°~~~~~ >=' ~ ; "„ b. Jti~~.<, '~ ~~ -'a. o ~o;w ~r S~ , aoa wenands MB.Y. ``K.~ 6 1 ..~3 `~ /^t 'y r ~~~ ® Impacts to 404 INetlends r~ ® Impacts to Open Ytiater { ~ , •~ Wetland Impact #1: 404 Wetlands ~°'~ D'I• ~~ WATT INr~E ~~ 0.721 ac (temporary) ;'° 0 6+00 DD \\ 1 v; 486 4'R Ji ri'F :F' F.~/F' '^~(~ E'X:S" U b'. aC~1A~H-~ .,.,i Fr;i~. ~?iik.fiMJC, Jl 0 50 ~ co 200 SCALE 1 "= 100' 2 a r` open wateF ', 1 _ j` Open Water Impact #1: ^, ; 0.222~~c-(temporary) .; ~ ~\ ! - i ; ~_ r:4. F4,~ , , f .' I r • 1! - r r q ~ . i . ~ i .~ rr ? 0 , .. ` ~ f ' 1 / .r v ~ L ~ '. ;' .. / % 6 ` ,' i µ£' EvELt ~ - i . - _ ~ \ WSEI. = 11 -_ <r ... ~ 3.15' o~ ( , ~ _ 1 7.7.5 POGO Sr; (~F'" i / -- DE'. SEE' Di .., ~ __ _ _ - l i ~ f 4; / 45 6J -_NJ \ l t ='60"s D.I. RAW ~fATSR IN1'AK IPE -. ~ ~ i I ~; r _ ~S~ 3J~J ''Ei i IOK PRELIMINARY NOT FOR CONSTRUCTION ': 0+00 0+50 1+00 1+50 2+00 2+50 3+00 3+50 4+00 4+50 5+00 5+50 6+00 6+50 7+00 7+50 8+00 8+5D 9+00 9+50 10+00 10+50 11+DO 11+50 12+00 12+50 U+00 13+50 I ~: '. • K_NGS B_:J~F P~'v1PI~G STATION ~ Lc Q4 V ~~C~D L01h'ER ~ QP= i EAR ~~ y v LO~~PCAPI~E?P1~ATEP~NC 's;IP.TEP, & SEt,~':~ AUT~JKI-~ ~} , ..' : 243 North Front Streel •v-.+~-~+~-+~-+~ .. ~~ ~/U I Wilmington, North Carolina 28401 i."~j~l~~ ~<~~IT~ - t ,/ ~= nkp ': R„~Y~r Jr,~TER \TAKE PI: Phooe: (s1o)343-loan ,Fox: (sto)zsi-azez ~~~::~ ^ it "~ i ~ M000266] ®0006691 `~ ~ A. k/1 A hV U F~ ~ 01 _ ~... .. ' .._ _ _....__.~ __..... -_ ^ .;`,: -.. .. ._..._ ...._: -"_ : ' www.mckimcreed.com - J I A. 1+U./ TO STA,. 12=:; iv : LOWER CAPE FEAR WATER AND SEWER AUTHORITY KING'S BLUFF RAW WATER PUMP STATION EXPANSION PROJECT SUMMARY ~~~~ ; 243 North Front Street Wilmington, NC 28401 January 2007 INTRODUCTION This document will provide a summary of the Lower Cape Fear Water and Sewer Authority's (Authority) Kings Bluff raw water pump station expansion project. The pump station is located at Lock & Dam No. 1 in Bladen County, NC. The Authority is currently in the design process for a capacity upgrade to the station, involving replacement of raw water pumps, electrical improvements, and telemetry/controls upgrades. The growth experienced in southeast North Carolina over the past decade, coupled with projections of continued significant growth throughout the region will result in the need for additional infrastructure and public utility services. The Authority serves a vital role in the region as a provider of raw water to Brunswick County and the City of Wilmington as well as several industries on US 421. The primary areas considered in this summary are: • Capacity improvements to the current raw water intake structure on the Cape Fear River • Expansion of the existing pump station configuration to provide an additional wetwell for the installation of a fourth pump • Providing additional storage capacity to the Authorit~s current 3.0 Million Gallon per Day (MGD) ground tank 1 INTAKE CAPACITY IMPROVEMENTS Construction of a New Intake Pipe and Screen 1.1 DESCRIPTION Intake capacity improvements will involve the installation of a second intake pipe from the Cape Fear River to the King's Bluff Pump Station. This would require approximately 1,100 LF of pipe parallel to the existing 48-inch intake as well as a new screen structure that would be located in the Cape Fear River adjacent to the existing intake screens. 1.2 PIPE SIZE To determine the required pipe diameter, the capacity of the existing 48-inch was used as a basis for comparison for the parallel intake pipe. Commercially available pipe sizes in the range of 54" through 72" were examined in order to provide the required capacity and maintain economic feasibility. The 48-inch which provides 45 MGD design capacity and the parallel pipe would supplement that capacity to provide a minimum of 100 MGD. A 60-inch parallel pipe was chosen to provide the necessary capacity to the system to reach the 100 MGD minimum. Ductile iron pipe was selected as the material to be utilized for the parallel intake pipe. 1.3 INTAKE SCREEN As with all intake alternatives presented in this report, a screened intake structure will be required to remove sediment, sand, and debris from the raw river water prior to pumping. For consistency, the intake screen structures evaluated were based on screens manufactured by Johnson Screens. The screens are available in capacities suitable for this application and would be sized to provide the requisite flows. It is also noted that each screen requires an air backwash system in order to remove accumulated sand and sediment from the river. For the purposes of this report, it was anticipated that a new air backwash system would be required, but could be utilized for both the existing screen structure and the new screen structure, with an alternating cycle. 2 PUMP STATION WETWELL EXPANSION 2.1 CURRENT FACILITIES The Kings Bluff pump station is configured with a wetwell sized for three (3) raw water pumps. In order to provide raw water capacities beyond 55 MGD (maximum flow available from the 3- pump configuration) a fourth pump will need to be installed at this facility. Subsequently, the wetwell must be expanded to accommodate the additional pump. The Authority is including an expansion of the wetwell as part of the on-going pump station upgrade project. 3 GROUND STORAGE CAPACITY IMPROVEMENTS 3.1 DESCRIPTION The Kings Bluff facility is configured to pump raw water to a 3 MG ground tank located near the Brunswick County Northwest Water Treatment Plant. This tank is located on a regional high elevation and supplies raw water to customers by gravity feed. Raw water demands on the Kings Bluff facility in recent years have increased dramatically, placing additional burden upon the system and its components. Such demands have increased to a point that at least one raw water pump operates 24-hours per day, 7 days per week in order to meet demands and maintain the level of the 3 MG ground tank. 3.2 GROUND TANK STORAGE The addition of a second ground storage tank was evaluated at various capacities to determine the effect on the Authority's system. Hydraulic modeling was performed for both steady-state and extended period simulations. This was accomplished to determine Total Dynamic Head (TDH) conditions for existing and future pump recommendations, as well as cycle times for pump operation and the impact to the ground tank levels. For comparison purposes, the height of the second tank was modeled identical to the existing tank, which has an overall height of 37.5 feet and water level maximum height of 35.5 feet. This would provide equal hydraulic conditions for the storage system and would eliminate the need for altitude control valuing or increased TDH on the Authority's raw water pumps. Additionally, hydraulic test information provided by Charles R. Underwood Inc., dated March 2006, was utilized for model calibration. A 5 MG ground storage tank was chosen to provide the storage associated with the intake expansion. The dimensions of a 5 MG ground storage tank would require an inside diameter of 155 foot, while maintaining a height of 35.5 feet tall for hydraulic purposes. 07/17/2006 13:30 9104520060 LANDMANAGEMENT PAGE 03/03 AGENT AUTHORIZATION k'ORM TO WHOM IT MAX CONCERN: Uwe, the undersigned, hereby authorize Land Management Group, Jnc. to act as our agent in the determiuaation of jurisdictional wetland boundaries on the subject property, Kia~ Bluff Pump Station Expaasiion in Bladem County, NC. Byway of this form, T/we additionally authorize access to the site bS' representatives of the US Army Corps of Engineers and/or the NC Division of Coastal Management fox the purpose of reviewing the flagged wetland boundary and providing a final jurisdictional determination. Any questions regarding the jurisdictional wetland determination should be directed to Land 1~IanagemPnt Group, Inc. Please provide the follow__iag_inforination: Property Address andParccllDNwmber: 246 Private Rd.. Riegelwood, NC 28456 Current Property Owner Name: Lower Cape Fear Water & Sewer Authority Owner Address 8c Phone Number: 1 1 07 New Pointe Blvd. Suite 1 7 Leland, North Carolina 28451 910-383-1919 Please circle Yes or No for the followiz~g_questions: I/We are the current owners: . es No UWe are under contract to purchase the subject property: Yes i./We are under option to purchase the subject pzoperry: Yes ~ UWe have no legal interest in subject properly: ~ ?) Yes No (i.e. speculative ~regaeat -NOTE: Site access will be restricted without notice/aathoriaatioA by carreat owner) Lower Cape Fear Water & Sewer Authority Don Betz P ' er's Name Print Applicant's Name er's Signature Applicant's Signature (not required if under contract or under option) Executive Director July 24, 2006 July 24, 2006 Date Date