20021769 Ver 4_Public Notice_20090515

EE:31
US Army Corps
Of Engineers
Wilmington District
OCT F O a - 11 6 9
Issue Date: May 13, 2009
Comment Deadline: June 12, 2009
Corps Action ID #: SAW-2006-40205-063
The Wilmington District, Corps of Engineers (Corps) has received an application from
the Town of Southern Pines seeking Department of the Army authorization for the
discharge of fill material into 1.6 acres of Section 404 jurisdictional riparian wetlands and
444 linear feet stream channel (UT to Horse Creek), to facilitate the Southern Pines Raw
Water Reservoir project in Moore County.
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Specific plans and location information are described below and shown on the attached
plans. This Public Notice and all attached plans are also available on the Wilmington
District Web Site at www.saw.usace.aM.mil/wetlands
t;zl
Applicant: Town of Southern Pines D
Attn: Mr. David White MAY 2009
482 E. Connecticut Avenue
PUBLIC NOTICE
Southern Pines, North Carolina 28387 yyE DENR•WATER?Ty
TVMSAND STORNWAMBRANCH
Agent (if applicable): Dr. J.H. Carter, III and Associates, Inc.
Post Office Box 891
Southern Pines, North Carolina 28388
Authority
The Corps will evaluate this application and decide whether to issue, conditionally issue,
or deny the proposed work pursuant to applicable procedures of Section 404 of the Clean
Water Act (33 U.S.C. 1344).
Location
The 53.18 acre project area is located west of U.S. Highway 1 and south of Thunder
Road (SR 1102), southwest of the existing Southern Pines Water Treatment Facility, in
Southern Pines„ Moore County North Carolina. The site contains approximately 1.6
acres of jurisdictional riparian wetlands which are adjacent to an unnamed tributary (UT)
to Horse Creek, a tributary of the Lumber River, a Navigable Water of the United States.
An earthen dam approximately 80 feet wide also exists within the project area, creating
an impoundment of approximately 1.4 acres. Site coordinates are 35.0837°N,
79.4967°W.
Existing Site Conditions
The project area is located in the Greater Sandhills of south-central North Carolina, a
region characterized by pine-forested, gently rolling topography and sandy soils.
Elevations in the immediate projects area range from 250 to 463 feet above mean sea
level. Upland soils are well drained and, according to the United States Department of
Agriculture Soil Survey of Moore County (December 1986), consist predominantly of
Candor sand and Ailey and Fuquay loamy sands and support longleaf pine (Pinus
palustris), blackjack oak, (Quercus marilandica), turkey oak (Quercus Laevis), and an
herbaceous layer of Carolina wiregrass.
Wetlands within the site are classified as Vaucluse loamy sand and Bibb fine sandy loam,
both poorly drained respectively, and have been classified as hydric soils for Moore
County. These wetlands support vegetation which mainly consists of loblolly pine (Pinus
taeda), tulip poplar (Liriodendron tulipfera), swamp blackgum (Nyssa biflora), red maple
(Acer rebrum), sweetbay magnolia (Magnolia virginiana), sweet gallberry (Ilex coriacea)
and switchcane (Arundinaria tecta).
Surrounding land use currently consists of undeveloped forested land and agricultural
fields.
Applicant's Stated Purpose
The purpose of the project is to provide a reliable source of drinking water during
extreme drought situations. The reservoir is necessary in order to store additional water
for the Town of Southern Pines water supply.
Project Description
The applicant has proposed to discharge fill material into 1.6 acres of Section 404
jurisdictional riparian wetlands and 444 linear feet stream channel (UT to Horse Creek),
to facilitate the Southern Pines Raw Water Reservoir project in Moore County. The
proposed project consists of the following actions: (1) the discharge of fill material into
0.7 acres of forested wetlands and 277 linear feet of stream channel to construct a dam;
(2) the inundation of 0.9 acres of forested wetlands and 167 linear feet of stream channel,
resulting in a 140-million gallon raw water storage reservoir; and (3) the construction of a
delivery pipeline to the reservoir, a pump station at the reservoir, and a delivery line from
the reservoir to the Town's existing water treatment plant (no wetland/stream impact).
An earthen dam approximately 80 feet wide exists within the project area, creating an
impoundment of approximately 1.4 acres which will also be flooded during construction.
This will not be considered an impact, however, since flooding of open water does not
alter the functionality of this aquatic resource.
Project plans and narrative have been included with this Public Notice.
2
The applicant also submitted an Alternatives Analysis, included with this Public Notice.
The applicant submitted a mitigation proposal with their application that entails payment
into the Ecosystem Enhancement Program (EEP) for restoration of 1.6 acres of riparian
wetlands and 444 linear feet of warm water stream within the Lumber River watershed.
It also includes the preservation of approximately 8 acres of high quality forested
wetlands adjacent to the existing pump station within the floodplain of Drowning Creek.
Other Required Authorizations
This notice and all applicable application materials are being forwarded to the appropriate
State agencies for review. The Corps will generally not make a final permit decision
until the North Carolina Division of Water Quality (NCDWQ) issues, denies, or waives
State
Certification required by Section 401 of the Clean Water Act (PL 92-500). The receipt of
the application and this public notice combined with appropriate application fee at the
North Carolina Division of Water Quality central office in Raleigh will constitute initial
receipt of an application for a 401 Water Quality Certification. A waiver will be deemed
to occur if the NCDWQ fails to act on this request for certification within sixty days of
the date of the receipt of this notice in the NCDWQ Central Office. Additional
information regarding the Clean Water Act certification may be reviewed at the NCDWQ
Central Office, 401 Oversight and Express Permits Unit, 2321 Crabtree Boulevard,
Raleigh, North Carolina 27604-2260. All persons desiring to make comments regarding
the application for certification under Section 401 of the Clean Water Act should do so in
writing delivered to the North Carolina Division of Water Quality (NCDWQ), 2321
Crabtree Boulevard, Raleigh, North Carolina 27604-2260, Attention: Ms Cyndi Karoly
by June 5, 2009
Cultural Resources
The Corps has consulted the latest published version of the National Register of Historic
Places and is aware of a registered property located approximately 1,200 feet south of the
proposed project site. This property, listed as the "McLeod Family Rural Complex", is
approximately 223 acres in size and may or may not be affected by the proposed work.
Presently, unknown archeological, scientific, prehistoric, or historical data may be
located within the project area.
Endangered Species
The Corps has reviewed the project area, examined all information provided by the
applicant and consulted the latest North Carolina Natural Heritage Database. Based on
available information, the Corps has determined pursuant to the Endangered Species Act
of 1973, that the proposed project will have no effect on federally listed endangered or
3
threatened species or their formally designated critical habitat. A final determination on
the effects of the proposed project will be made upon additional review of the project and
completion of any necessary biological assessment and/or consultation with the U.S. Fish
and Wildlife Service and/or National Marine Fisheries Service. Consultation under
Section 7 of the ESA will be initiated and no permit will be issued until the consultation
process is complete.
Evaluation
The decision whether to issue a permit will be based on an evaluation of the probable
impacts, including cumulative impacts, of the proposed activity on the public interest
(please see attached information regarding permitting history and cumulative impacts).
That decision will reflect the national concern for both protection and utilization of
important resources. The benefit which reasonably may be expected to accrue from the
proposal must be balanced against its reasonably foreseeable detriments. All factors
which may be relevant to the proposal will be considered including the cumulative effects
thereof; among those are conservation, economics, aesthetics, general environmental
concerns, wetlands, historic properties, fish and wildlife values, flood hazards, flood plain
values (in accordance with Executive Order 11988), land use, navigation, shoreline
erosion and accretion, recreation, water supply and conservation, water quality, energy
needs, safety, food and fiber production, mineral needs, considerations of property
ownership, and, in general, the needs and welfare of the people. For activities involving
the discharge of dredged or fill materials in waters of the United States, the evaluation of
the impact of the activity on the public interest will include application of the
Environmental Protection Agency's 404(b)(1) guidelines.
Commenting Information
The Corps of Engineers is soliciting comments from the public; Federal, State and local
agencies and officials, including any consolidate State Viewpoint or written position of
the Governor; Indian Tribes and other interested parties in order to consider and evaluate
the impacts of this proposed activity. Any comments received will be considered by the
Corps of Engineers to determine whether to issue, modify, condition or deny a permit for
this proposal. To make this decision, comments are used to assess impacts on
endangered species, historic properties, water quality, general environmental effects and
the other public interest factors listed above. Comments are used in the preparation of an
Environmental Assessment (EA) and/or an Environmental Impact Statement (EIS)
pursuant to the National Environmental Policy Act (NEPA). Comments are also used to
determine the need for a public hearing and to determine the overall public interest of the
proposed activity.
Any person may request, in writing, within the comment period specified in this notice,
that a public hearing be held to consider the application. Requests for public hearings
shall state, with particularity, the reasons for holding a public hearing. Requests for a
4
public hearing shall be granted, unless the District Engineer determines that the issues
raised are insubstantial or there is otherwise no valid interest to be served by a hearing.
Written comments pertinent to the proposed work, as outlined above, will be received by
the Corps of Engineers, Wilmington District, until 5pm, June 12, 2009. Comments
should be submitted to Emily B. Hughes, 69 Darlington Avenue, Wilmington, North
Carolina, 28403-1343, telephone [phone].
5
Alternatives Considered
Town of Southern Pines
Offstream Raw Water Reservoir
The Town of Southern Pines has experienced significant problems with the water supply intakes
located in Drowning Creek. The issue has been the elevation of the intakes with respect to the
depth of the creek during dry periods. Specifically, the intakes do not remain completely
submerged and the Town is unable to get enough raw water to the plant to meet service needs.
Hobbs, Upchurch and Associates (HUA) conducted this study to review all available options for
preventing this problem in the future.
In order to ensure that the Town can meet the demands of its potable water system, it is essential
that an adequate supply of raw water is constantly available to the plant. In reviewing the
possible options, the following alternatives were considered.
A. No Action
The choice to take no action in the matter of providing constant raw water supply to the
plant is not considered a viable alternative. Currently, during low-flow conditions, the
intakes are not completely submerged and the Town is unable to get enough raw water to
the plant, leaving the Town with a potable water crisis. In order to provide the Town
with potable water during low-flow conditions in Drowning Creek, the Town must do
something.
B. Proposed Action-Pump to Offstream Raw Water Reservoir in anticipation of
drought
The construction of an Offstream Raw Water Reservoir would allow the Town to fill this
"reserve" reservoir during the winter or high-flow months to ensure that an extra supply
of raw water is on hand during the driest months, thereby reducing the amount of water
needing to be withdrawn directly from Drowning Creek during severe drought
conditions. This alternative has less environmental issues than Alternative E - Weir and
Offstream Raw Water Reservoir.
C. Move Intake Structure to Side Channel
Moving the intake structures to a man-made side channel does not alleviate the issue of
the water level and intake height. That is, the water level in a side channel would be the
same as the main channel and would not insure that the intakes would remain submerged.
Digging the side channel deeper than the main channel would result in constant siltation
of this channel resulting in repeated maintenance, leaving the Town in a similar situation
that they are in now.
D. Lowering Intake structures in Drowning Creek
Lowering the current intake structures was investigated, but the existing structures cannot
be lowered further without compromising their function. Lowering them further would
lead to constantly sucking silt and other undesirable bottom debris into the system.
E. Weir and Offstream Raw Water Reservoir
Originally, in addition to an Offstream Raw Water Reservoir, the Town of Southern
Pines was proposing to install a permanent sheet pile weir in Drowning Creek. This
would have raised the water level in the creek just enough to keep the intakes submerged
during most low flow conditions. Normal flows would pass over the weir and the 7Q10
flow would be maintained by flow through a pipe in the bottom of the weir. Under this
alternative, the Town would be able to fill the reservoir with the intakes submerged up to
the worst drought conditions. It was determined that the weir would not be necessary as
long as the capacity of the Offstream Reservoir was sufficient. The proposed weir had a
number of environmental issues including downstream flow, impacts to wetlands and
streams and fish and wildlife impacts.
Avoidance and Minimization
Town of Southern Pines
Offstream Raw Water Reservoir
This project has been revised and redesigned to reduce impacts to environmental
resources. The Town of Southern Pines determined that the installation of a permanent weir
within Drowning Creek was not necessary as long as the capacity of the raw water reservoir was
sufficient. By revising the project to eliminate the weir, the Town has minimized impacts to
jurisdictional wetlands and streams, and avoided impacts to downstream water quality and
aquatic and terrestrial wildlife resources within and along Drowning Creek.
Proposed Mitigation
Town of Southern Pines
Offstream Raw Water Reservoir
The Town of Southern Pines proposes a 1:1 mitigation ratio for wetland impacts (1.6 acres),
along with preservation of approximately 8 acres of high quality forested wetlands adjacent to the
existing pump station within the floodplain of Drowning Creek (see enclosed topographic map).
The stream channel on the proposed reservoir site is degraded and silted in due to erosion from
the existing earthen dam so the Town proposes a 1:1 ratio for stream channel impacts (444 linear feet).
The Town of Southern Pines plans to purchase 1.6 acres of riparian wetland mitigation credits
and 444 linear feet of stream channel mitigation credits from the N.C. Ecosystem Enhancement
Program (EEP) in addition to the preservation of approximately 8 acres of high quality forested
wetlands along Drowning Creek.
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PHOTOGRAPHS OF THE PROPOSED SOUTHERN PINES RAW WATER I
RESERVOIR SITE R 0 6 2009

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Existing pond onsite (above) and pond outfall into stream/wetland (below).
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Representative photographs of streams and wetlands onsite.
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APPLICATION FOR DEPARTMENT OF THE ARMY PERMIT
(33 CFR 325)
OMB APPROVAL NO. 0710-0003
Expires December 31, 2004
The Public burden for this collection of information is estimated to average 10 hours per response, although the majority of applications should
require 5 hours or less. This includes the time for reviewing instructions, searching existing data sources, gathering and maintaining the data
needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this
collection of information, including suggestions for reducing this burden, to Department of Defense, Washington Headquarters Service Directorate of
Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202.4302; and to the Office of Management and
Budget, Paperwork Reduction Project (0710-0003), Washington, DC 20503. Respondents should be aware that notwithstanding any other provision
of law,no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB
control number. Please DO NOT RETURN your form to either of those addresses. Completed applications must be submitted to the District Engineer
having jurisdiction over the location of the proposed activity.
PRIVACY ACT STATEMENT
Authorities: Rivers and Harbors Act, Section 10, 33 USC 403;Clean Water Act, Section 404, 33 USC 1344; Marine Protection, Research and
Sanctuaries Act, 33 USC 1413. Principal Purpose: Information provided on this form will be used in evaluating the application for a permit. Routine
Uses: This information may be shared with the Department of Justice and other federal, state, and local government agencies. Submission of
requested information is voluntary, however, if information is not provided the permit application cannot be evaluated nor can a permit be issued.
One set of original drawings or good reproducible copies which show the location and character of the proposed activity must be attached to this
application (see sample drawings and instructions) and be submitted to the District Engineer having jurisdiction over the location of the proposed
activity. An application that is not completed in full will be returned.
ITEMS 1 THRU 4 TO BE FILLED BY THE CORPS
1. APPLICATION NO. 2. FIELD OFFICE CODE 3. DATE RECEIVED 4. DATE APPLICATION COMPLETED
(ITEMS BELOW T BE FILLED BY APPLICA T)
5. APPLICANT'S NAME 8. AUTHORIZED AGENT'S NAME AND TITLE (an agent is not required)
Town of Southern Pines Jennifer M. Archambault
ATTN: Mr. David White, Assistant Town Manager Wildlife Biologist
6. APPLICANTS ADDRESS AGENTS ADDRESS
Dr. J. H. Carter III & Associates, Inc.
482 E. Connecticut Ave. Environmental Consultants
Southern Pines, NC 28387 515 Midland Road, Suite F
Southern Pines, NC 28387
7. APPLICANT'S PHONE NOS. W/AREA CODE 0. AGENTS PHONE NOS. W/AREA CODE
a. Residence: N/A a. Residence: N/A
b. Business: 910) 692-2463 b. Business: (910 695-1043
11.STATEMENT OF AUTHORIZATION
I hereby authorize, Dr. J. H. Carter III & Associates, Inc. to act in my behalf as my agent in the processing of this application and to furnish, upon request,
supplemental information in support of this permit application.
SEE ATTACHED AUTHORIZATION LETTER
APPLICANTS SIGNATURE DATE
NAME, LOCATION, AND DESCRIPTION OR PROJECT OR ACTIVITY
12. PROJECT NAME OR TITLE (see instructions)
Southern Pines Raw Water Reservoir
13. NAME OF WATERBODY, IF KNOWN (if applicable) 4. PROJECT STREET ADDRESS (if applicable)
Unnamed tributary to Horse Creek, Lumber River Basin
15. LOCATION OF PROJECT N/A
Moore North Carolina
COUNTY STATE
16. OTHER LOCATION DESCRIPTIONS, IF KNOWN (see instructions) Section, Township, Range, Lat/Lon, and/or Accessoes Parcel Number, forexample.
Pinebluff USGS 7.5 minute quadrangle;
Center site coordinates (NAD 83 Decimal degrees): 35.0836857°N, 79.4967476°W;
Tax PIN: 845800150992
17. DIRECTIONS TO THE SITE
From Southern Pines, NC, take US Highway 1 South for approximately 8.5 miles. Turn right on Thunder Road (SR 1102) and drive
approximately 0.5 mile to the site entrance (on the left side of the road). The project site is located WEST of US Highway 1 and SOUTH of
Thunder Road, southwest of the Southern Pines Water Treatment Plant.
ENG FORM 4345NOD, Jul 97 EDITION OF FEB 94 IS OBSOLETE (Proponent: CECW-OR)
18. Nature of Activity (Description of project, include all features)
The Town of Southern Pines proposes to construct a dam and reservoir on an unnamed Tributary to Horse Creek. Construction of the dam will
result in the discharge of fill material into 0.7 acre of wetlands and 277 linear feet of stream channel. Filling the 140-million-gallon raw water
reservoir will result in flooding of 0.9 acre of forested wetlands and 167 linear feet of stream channel.
A pipeline will also be constructed to deliver water to the reservoir; this feature will have no impact to jurisdictional areas.
19. Project Purpose (Describe the reason or purpose of the project, see instructions)
The purpose of the project is to provide a reliable source of drinking water during extreme drought situations. The reservoir is necessary in order
to store additional water for the Town of Southern Pines water supply. In August 2002, Drowning Creek fell below the level of the water intake
screens at the water plant's intake site. Although the permitted water withdrawal is 8 million gallons per day (MGD), the average water
withdrawals were 5 MGD (peak 6 MGD) in late July/ early August. By 8 August, the water withdrawal rate was down to 3 MGD and a water
emergency was declared. The Town was approved for a temporary weir on 6 Dec. 2002 by the USACE (Action ID 200300198) that has since been
removed. The combination of extremely low water flow, the height of the existing intake structures and insufficient storage capacity led to
mandatory water-use restrictions in August 2002. The best solution in preventing future water emergencies is increasing the Town's water
storage capacity with the proposed reservoir. The existing intake structures cannot be lowered further due to their design. Construction of a weir
within Drowning Creek can be avoided with the increased storage capacity that the proposed reservoir will provide.
USE BLOCKS 20-22 IF DREDGED AND/OR FILL MATERIAL IS TO BE DISCHARGED
20. Reason(s) for Discharge
Discharge of fill material is necessary for dam construction. Fill impacts have been minimized by choosing a site with an existing dam. The
requested amount of fill will allow the dam to be the necessary dimensions for the size of the reservoir. Impacts will also include flooding, which
is an inherent necessity for creating the reservoir.
21. Type(s) of Material Being Discharged and the Amount of Each Type in Cubic Yards
Fill material will consist of soil and gravel. Fill material within the wetlands will total approximately 26,750 cubic yards.
22. Surface Area in Acres of Wetlands or Other Waters Filled (see instructions)
Dam construction:
0.7 acre of forested riparian wetlands (fill)
277 linear feet of stream (fill and culvert)
Reservoir:
0.9 acre of forested/herbaceous riparian wetlands (flooding)
167 linear feet of stream (flooding)
Total impacts:
Wetlands -1.6 acres
Streams - 444 linear feet (Area = approximately 1,332 square feet or 0.03 acre)
23. Is Any Portion of the Work Already Complete? Yes - No X IF YES, DESCRIBE THE COMPLETED WORK
24. Addresses of Adjoining Property Owners, Lessees, Etc., Whose Property Adjoins the Waterbody (If more than can be entered here, please attach a supplemental list).
Please see the attached list labeled "Block 24".
25. List of Other Certifications or Approvals/Denials Received from other Federal, State, or Local Agencies for Work Described in This Application.
AGENCY TYPE APPROVAL IDENTIFICATION NUMBER DATE APPLIED DATE APPROVED DATE DENIED
restricted to zoning, building, and flood
26. Application is hereby made for a permit or permits to authorize the work described in this application. I certify that the information in this application is
complete and accurate. I further certify that I possess the authority to undertake the work described herein or am acting as the duly authorized agent
of the applicant.
SIGNATURE OF APPLICANT DATE SIGNATURE OF AGENT f DATE
The application must be signed by the person who desires to undertake he proposed activity (applicant) or it may be signed by a duly authorized
agent if the statement in block 11 has been filled out and signed.
18 U.S.C. Section 1001 provides that: Whoever, in any manner within the jurisdiction of any department or agency of the United States knowingly
and willfully falsifies, conceals, or covers up any trick, scheme, or disguises a material fact or makes any false, fictitious or fraudulent statements or
representations or makes or uses any false writing or document knowing same to contain any false, fictitious or fraudulent statements or entry, shall
be fined not more than $10,000 or imprisoned not more than five years or both.
ENG FORM 4345NOD, Jul 97 EDITION OF FEB 94 IS OBSOLETE (Proponent: CECW-OR)
own of as`?
outhern Ines
C--f- ;a Ate. North Carolina
f2 C", The Mid South Resort
Internationally Recognized for Program Excellence
10 July 2006
To Whom It May Concern:
Dr. J.H. Carter III & Associates, Inc. is authorized to conduct wetland delineations and
prepare and submit the necessary permits for the proposed Town of Southern Pines
Offstream Raw Water Reservoir (52 acre site) located west of U.S. Highway 1 and south
of Thunder Road (SR 1102), Moore County, North Carolina. Additionally, this letter
grants permission to federal and state regulatory authorities to conduct site visits on our
property to evaluate and certify wetland boundaries.
Sincer ,
David R. White
Assistant Town Manager
Director of Public Services
Town of Southern Pines
Public Services Division
482 E. Connecticut Avenue • Southern Pines, NC 28387 • Telephone [phone] • Fax [phone]
BLOCK 24 - ADDRESSES OF ADJOINING PROPERTY OWNERS
REFER TO ENCLOSED MAP WITH NUMBERS CORRESPONDING TO PROPERTY
OWNERS
1. Mark Aarons
P.O. Box 845
Southern Pines, NC 28388
2. Camron M. Shodja
P.O. Box 3
Whiteville, NC 28472
3. Julia Mae Matthews
277 Thunder Rd.
Pinebluff, NC 28373
4. Andrew D. & Kathleen S. White
540 E. Park Ave.
Pinebluff, NC 28373
5. Sledge Industries, Inc.
P.O. Box 523
Whiteville, NC 28472
6. James and Judy S. Leach
35 Pinewild Dr.
Pinehurst, NC 28374
Alternatives Considered
Town of Southern Pines
Offstream Raw Water Reservoir
The Town of Southern Pines has experienced significant problems with the water supply intakes
located in Drowning Creek. The issue has been the elevation of the intakes with respect to the
depth of the creek during dry periods. Specifically, the intakes do not remain completely
submerged and the Town is unable to get enough raw water to the plant to meet service needs.
Hobbs, Upchurch and Associates (HUA) conducted this study to review all available options for
preventing this problem in the future.
In order to ensure that the Town can meet the demands of its potable water system, it is essential
that an adequate supply of raw water is constantly available to the plant. In reviewing the
possible options, the following alternatives were considered.
A. No Action
The choice to take no action in the matter of providing constant raw water supply to the
plant is not considered a viable alternative. Currently, during low-flow conditions, the
intakes are not completely submerged and the Town is unable to get enough raw water to
the plant, leaving the Town with a potable water crisis. In order to provide the Town
with potable water during low-flow conditions in Drowning Creek, the Town must do
something.
B. Proposed Action-Pump to Offstream Raw Water Reservoir in anticipation of
drought
The construction of an Offstream Raw Water Reservoir would allow the Town to fill this
"reserve" reservoir during the winter or high-flow months to ensure that an extra supply
of raw water is on hand during the driest months, thereby reducing the amount of water
needing to be withdrawn directly from Drowning Creek during severe drought
conditions. This alternative has less environmental issues than Alternative E - Weir and
Offstream Raw Water Reservoir.
C. Move Intake Structure to Side Channel
Moving the intake structures to a man-made side channel does not alleviate the issue of
the water level and intake height. That is, the water level in a side channel would be the
same as the main channel and would not insure that the intakes would remain submerged.
Digging the side channel deeper than the main channel would result in constant siltation
of this channel resulting in repeated maintenance, leaving the Town in a similar situation
that they are in now.
D. Lowering Intake structures in Drowning Creek
Lowering the current intake structures was investigated, but the existing structures cannot
be lowered further without compromising their function. Lowering them further would
lead to constantly sucking silt and other undesirable bottom debris into the system.
E. Weir and Offstream Raw Water Reservoir
Originally, in addition to an Offstream Raw Water Reservoir, the Town of Southern
Pines was proposing to install a permanent sheet pile weir in Drowning Creek. This
would have raised the water level in the creek just enough to keep the intakes submerged
during most low flow conditions. Normal flows would pass over the weir and the 7Q10
flow would be maintained by flow through a pipe in the bottom of the weir. Under this
alternative, the Town would be able to fill the reservoir with the intakes submerged up to
the worst drought conditions. It was determined that the weir would not be necessary as
long as the capacity of the Offstream Reservoir was sufficient. The proposed weir had a
number of environmental issues including downstream flow, impacts to wetlands and
streams and fish and wildlife impacts.
Avoidance and Minimization
Town of Southern Pines
Offstream Raw Water Reservoir
This project has been revised and redesigned to reduce impacts to environmental
resources. The Town of Southern Pines determined that the installation of a permanent weir
within Drowning Creek was not necessary as long as the capacity of the raw water reservoir was
sufficient. By revising the project to eliminate the weir, the Town has minimized impacts to
jurisdictional wetlands and streams, and avoided impacts to downstream water quality and
aquatic and terrestrial wildlife resources within and along Drowning Creek.
Proposed Mitigation
Town of Southern Pines
Offstream Raw Water Reservoir
The Town of Southern Pines proposes a 1:1 mitigation ratio for wetland impacts (1.6 acres),
along with preservation of approximately 8 acres of high quality forested wetlands adjacent to the
existing pump station within the floodplain of Drowning Creek (see enclosed topographic map).
The stream channel on the proposed reservoir site is degraded and silted in due to erosion from
the existing earthen dam so the Town proposes a 1:1 ratio for stream channel impacts (444 linear feet).
The Town of Southern Pines plans to purchase 1.6 acres of riparian wetland mitigation credits
and 444 linear feet of stream channel mitigation credits from the N.C. Ecosystem Enhancement
Program (EEP) in addition to the preservation of approximately 8 acres of high quality forested
wetlands along Drowning Creek.