20072202 Ver 1_CAMA Application_20071220

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NCDENR
North Carolina Department of Environment and Natural Resources
Division of Coastal Management
Michael F. Easley, Governor James H. Gregson, Director William G. Ross Jr., Secretary
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December 18, 2007
UAL ~ ~ ZOp7
MEMORANDUM:
~!' T~R.QUALITY
TO: Cyndi Karoly, Supervisor
401 Oversight & Express Permits Unit
Division of Water Quality-Surface Water Protection
FROM: Doug Huggett, NC DENR-DCM Major Permits Coordinator
400 Commerce Ave., Morehead City, NC 28557 (Courier 11-12-09)
SUBJECT: CAMA /Dredge & Fill Major Permit Application Review
Applicant: City of Wilmington, Sweeney Water Treatment Plant
Project Location: 407 Hilton St., adjacent to the NE Cape FearRiver, in Wilmington, New Hanover Co.
Proposed Project: to upgrade the existing WTP, including construction of a new retaining wall
Please indicate below your agency's position or viewpoint on the proposed project and return this
form by Jan. 10, 2008. If you have any questions regarding the proposed project, contact Robb
Mairs at [phone], when appropriate, in-depth comments with supporting data is requested.
REPLY:
This agency has no objection to the project as proposed.
This agency has no comment on the proposed project.
This agency approves of the project only if the recommended changes are
incorporated. See attached.
This agency objects to the project for reasons described in the attached
comments.
SIGNED DATE
127 Cardinal Drive Ext., Wilmington, North Carolina 28405-3845
Phone: [phone] FAX: [phone] Internet: www,nccoastalmanagement,net
An Equal Opportunity 1 Affirmative Action Employer - 50% Recycled 110% Post Consumer Paper

DIVISION OF COASTAL MANAGEMENT
FIELD INVESTIGATION REPORT
1. APPLICANT'S NAME: City of Wilmington, Sweeney Water Treatment Plant c/o Sterling Cheatham
2. LOCATION OF PROJECT SITE: East bank of the Northeast Cape Fear River, at 407 Hilton St., in
Wilmington, New Hanover County.
Photo Index - 2006: 204-6659: Q-R, 3-6 2000: 204-212: R-S, 3-5 1995: 14-154: V-W, l 7-18
State Plane Coordinates - X: 2318269 Y: 186023
Rover File - 0-121712A Latitude: 34°15'23.30058"N Longitude: 77°56'48.45296"W
3. INVESTIGATION TYPE: CAMA/D & F
4. INVESTIGATIVE PROCEDURE: Dates of Site Visit- 11/21/06, 12/14/06 and 12/17/07
Was Applicant Present -Yes (agent and surveyor)
5. PROCESSING PROCEDURE: Application Received - 12/05/07 (completed)
Office -Wilmington
6. SITE DESCRIPTION:
(A) Local Land Use Plan -Wilmington-New Hanover
Land Classification From LUP -Developed and Conservation (AEC's)
(B) AEC(s) Involved: ES
(C) Water Dependent: No
(D) Intended Use: Municipal
(E) Wastewater Treatment: Existing - City of Wilmington municipal sewer
Planned -Same
(F) Type of Structures: Existing -Water treatment plant with associated buildings
Planned -Expansion of facility and construction of a retaining wall
(G) Estimated Annual Rate of Erosion: n/a Source - n/a
7. HABITAT DESCRIPTION: [AREA]
TIARTI~:G'Tl FTT T FTl f1TTTFR
(A) Vegetated Wetlands -
(B) Non-Ve etated Wetlands - O en Water
(C) Other (Highground) 458,2 1 sq. ft.
(D) Total Area Disturbed: 458,251sq. ft. (10.52 acres)
(E) Primary Nursery Area: Yes
(F) Water Classification: SC Open: No shellfish resources
8. PROJECT SUMMARY: The City of Wilmington proposes to upgrade the existing Sweeney Water Treatment
Plant (WTP) including the construction of a new retaining wall adjacent to the Northeast Cape Fear River.

City of Wilmington Sweeney Water Treatment Plant c/o Sterling Cheatham
Page 2
PROJECT DESCRIPTION
The project is located on the east bank of the Northeast Cape Fear River, north of downtown Wilmington, at 407 Hilton
Street, in Wilmington, in New Hanover County. The approximately 12.43 acre 3-parcel property has approximately 649
linear feet of frontage along the Northeast Cape Fear River. The site is currently used as the City's Water Treatment Plant
(WTP) with associated buildings and parking. Currently, the capacity of the WTP is 27.5 million gallons per day (mgd),
which provides drinking water to the City of Wilmington. The WTP withdraws raw water from the Cape Fear River that is
protected from saltwater intrusion by the US ACOE Lock and Dam # 1. The site drains by way of overland and piped flow
for ultimate discharge to the Northeast Cape Fear River that is located on the west end of the property. The highground
elevation of the project area ranges from 8' to 37' above Mean Sea Level (MSL). Upland vegetation consists of hardwood
trees consisting primarily of Oak. Other vegetation includes lawn grass and ornamental landscaping. The shoreline along
the steep river band is stabilized by shrubbery. There is a narrow strip of coastal wetland located on the most northern
portion of the property that consists primarily Smooth Cordgrass (Spartina alterniflora) and it is fronted by historical riprap
type of material for shoreline stabilization.
Arcadius finalized an Environmental Assessment (EA) for the Sweeney (WTP) during October 2007. The EA primarily
covered the expansion of the Sweeney WTP and its impact on the surrounding areas. The EA did not include development
that was located within the 75' Estuarine Shoreline Area of Environmental Concern (AEC). However; the EA did focus
on the increase of withdrawal from the Cape Fear River and additional discharge to the Northeast Cape Fear River.
The Northeast Cape Fear River is approximately 800 feet wide at the project site. It's waters are classified as SC, by the NC
Division of Water Quality. There are no shellfish resources in the project area. At the project site, the Northeast Cape Fear
River is a designated Primary Nursery Area (PNA), by the NC Division of Marine Fisheries. The highground portion of the
project is classified as "Developed" by the Wilmington-New Hanover Land Use Plan. The CAMA Areas of Environmental
Concern and any area located in the 100-year flood plain are considered to be classified as "Conservation".
PROPOSED PROJECT
The City of Wilmington proposes to upgrade the existing Sweeney Water Treatment Plant (WTP) including the
construction of a new retaining wall adjacent to the Northeast Cape Fear River. The upgrades to the facility would include
expansion of the WTP with a new equalization (EQ) basin, pump station, and clarifier tank would be added on the west
side of the property. Some existing abandoned buildings located on the west end of the property would be demolished and
rebuilt within the interior footprint for the proposed structures. The application states that the existing stormwater
management system would be retrofitted to handle additional stormwater runoff for the ne~v development, as well as
improved mitigation for stormwater runoff from existing, unchanged development. The proposed upland development
would have a final impervious coverage from 51.8% to 52.4 %. Development located within the 75' Estuarine Shoreline
AEC would 1.5% of the total percentage. The proposed expansion would potentially increase the water treatment capacity
from 27.5 mgd to 44 mgd. The applicant also proposes to stabilize the shoreline adjacent to the new, development with the
construction of a new approximately 300 linear foot vinyl retaining wall (cut-off wall). The application states that the new
retaining wall would be located entirely on highground above normal high water (NHW) and designed to minimize
uncontrolled concentrated points of surface runoff by catching sheet flow and piping it through the cut-off wall and
associated riprap (See project narrative and Sheet B6).
ANTICIPATED IlVIPACTS
Approximately 1.5% (6,874 sq. ft.) of the 10.52 acres of proposed development would be located within the 75' Estuarine
Shoreline AEC. The applicant maintains a NPDES permit for the site (NCS000406). The application also states that ail
Erosion and Sedimentation Control application has been submitted to N.C. Division of Land Quality.
Submitted by: Robb Mairs Date: 12/17/07 Office: Wilmington

oz-2202
®CY NP-1
APPLICATION for

Mayor Development Permit
pa:t re~i~a 12/z~fo6~
North Carolina DIVISION OF COASTAL MANAGEMENT
1. Primary Applicant/ Landowner Mformation
Business Name
City of Wilmington Project Name (if applicable)
Sweeney Water Treatment Plant Expansion
Applicant 1: First Name
Sterling MI
g. Last Name
Cheatham
Applicant 2: First Name MI Last Name
if additional applicants, please attach an additional page(s) with names listed.
Mailing Address
407 Hilton Street PO Box City
Wilmington State
NC
ZIP
28401 Country
USA Phone No.
910 -
343 - 3690 ext. FAX No.
910 - 341 - 4657
Street Address (if different from above)
Same as above City State ZIP
-
Email
2. AgentlContractorJnformation
Business Name
N/A
AgenU Contractor 1: First Name MI Last Name
AgenU Contractor 2: First Name MI Last Name
Mailing Address PO Box City State
ZIP Phone No. 1
-
- ext. Phone No. 2
- - ext.
FAX No. Contractor #
Street Address (if different from above) City State ZIP
Email
RECEIVE
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Form DCM MP-1 (Page 2 of 4)
AP'?LICATION for
Major Development Permit
3. Project Location.
County (can be multiple) Street Address State Rd. #
New Hanover 407 Hilton Street
Subdivision Name City State Zip
N/A Wilmington NC 28401 -
Phone No. Lot No.(s) (if many, attach additional page with list)
910 - 343 - 3690 ext. N/A
a. In which NC river basin is the project located? b. Name of body of water nearest to proposed project
Cape Fear River Basin NE Cape Fear River
c. Is the water body identified in (b) above, natural or manmade? d. Name the closest major water body to the proposed project site.
®Natural ^Manmade ^Unknown NE Cape Fear River
e. Is proposed work within city limits or planning jurisdiction? f. If applicable, list the planning jurisdiction or city limit the proposed
^X Yes ^No work falls within.
City of Wilmington
4. Situ Description
a. Total length of shoreline on the tract (ft.) b. Size of entire tract (sq.ft.) 12.43 acres (Project Area),
649' 14.25 acres (Drainage Area), 10.52 Acres (LOD)
c. Size of individual lot(s) d. Approximate elevation of tract above NHW (normal high water) or
N/A NWL (normal water level)
(If manylot sizes, please attach additional page with a list) 7 to 37 ft MSL ©NHW or ^NWL
e. Vegetation on tract
Oak trees, grass, coastal marsh, underbrush
f. Man-made features and uses now on tract
City of Wilmington Sweeney Water Treatment Plant
g. Identify and describe the existing land uses adjacent to the proposed project site.
Industrial and Commercial land uses
h. How does local government zone the tract? i. Is the proposed project consistent with the applicable zoning?
(Attach zoning compliance certificate, if applicable)
LI -Light Industrial ®Yes ^No ^NA
j. Is the proposed activity part of an urban waterfront redevelopment proposal? ^Yes ©No
k. Has a professional archaeological assessment been done for the Vact? If yes, attach a copy. ^Yes ®No ^NA
If yes, by whom? No, but a letter was obtained stating no survey is necessary. Please see attached.
I. Is the proposed project located in a National Registered Historic District or does it involve a ^Yes ®~ ~~ E ~ V E D
National Register listed or eligible property? NO, please see attached.
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Form DCM MP-1 (Page 3 of 4)
APPLICATION for
Major Development Permit
m. (i) Are there wetlands on the site? x^Yes ^No
(ii) Are there coastal wetlands on the site? x^Yes ^No
(iii) If yes to either (i) or (ii) above, has a delineation been conducted? ®Yes ^No
(Attach documentation, if available) Please see attached.
n. Describe existing wastewater treatment facilities.
Connected to City of Wilmington sanitary sewer service
o. Describe existing drinking water supply source.
Connected to City of Wilmington water service
p. Describe existing storm water management or treatment systems.
Portions of the existing stormwater system are either connected to the City of Wilmington stormwater system or eventually
- - -_- -
5. Activities and Impacts...
a. Will the project be for commercial, public, or private use? ^Commercial ®Public/Government
Drinking water treatment plant ^Private/Community
b. Give a brief description of purpose, use, and daily operations of the project when complete.
Project site is currently in use as a water treatment facility and is undergoing expansion. When complete, the facility
will function as it does now, to treat water for use as drinking water.
c. Describe the proposed construction methodology, types of construction equipment to be used during construction, the number of each type
of equipment and where it is to be stored.
Project will be constructed primarily in one phase with the use of cranes, backhoes, dump trucks, and other
construction equipment that will be stored within the fenced confines of the site.
d. List all development activities you propose.
Grading will take place on site, certain buildings will be demolished and rebuilt, roads will be paved with asphalt, new
structures will be built, rip rap will be installed, shoreline will be stabilized.
e. Are the proposed activities maintenance of an existing project, new work, or both?
Both
f. What is the approximate total disturbed land area resulting from the proposed project? ^Sq.Ft or x^Acres
10.52 acres
g. Will the proposed project encroach on any public easement, public accessway or other area ®Yes ^No ^NA
that the public has established use of?
Some utili work on road nearb
h. Describe location and type of existing and proposed discharges to waters of the state.
Existing and proposed discharges include emergency overflow from stormwater basins and water reservoirs. Also,
clear wells with lightly chlorinated water (0.5 ppm) may be drained once every 5 to 10 years. There is an existing
NPDES permit for the site (permit number NCS000406).
i. Wilt wastewater or stormwater be discharged into a wetland? ^Yes ©No ^NA
If yes, will this discharged water be of the same salinity as the receiving water? ^Yes ^No x^NA
j. Is there any mitigation proposed? ^Yes ^No ~WA~ ~'v E
If yes, attach a mitigation proposal. CC ^,
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ACT 0 8 2007
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Form DCM MP-1 (Page 4 of 4)
APPLICATION for
Major Development Permit
6. Additionallnformation
In addition to this completed application form, (MP-1) the following items below, if applicable, must be submitted in order for the application
package to be complete. items (a) - (f) are always applicable to any major development application. Please consult the application
instruction booklet on how to properly prepare the required items below.
a. A project narrative.
b. An accurate, dated work plat (including plan view and cross-sectional drawings) drawn to scale. Please give the present status of the
proposed project. Is any portion already complete? If previously authorized work, clearly indicate on maps, plats, drawings to distinguish
between work completed and proposed.
c. A site or location map that is sufficiently detailed to guide agency personnel unfamiliar with the area to the site.
d. A copy of the deed (with state application only) or other instrument under which the applicant claims title to the affected properties.
e. The appropriate application fee. Check or money order made payable to DENR.
f. A list of the names and complete addresses of the adjacent waterfront (riparian) landowners and signed return receipts as proof that such
owners have received a copy of the application and plats by certified mail. Such landowners must be advised that they have 30 days in
which to submit comments on the proposed project to the Division of Coastal Management.
Name Harnetts Landing, LLC Phone No.
Address. P.O. Box 5601, Wilmington, NC 28403
Name Chemserve Terminal, Inc. Phone No.
Address P.O. Box 117, Wilmington, NC 28402
::.Name Phone No.
Address
g. A list of previous state or federal permits issued for work on the project tract. Include permit numbers, permittee, and issuing dates.
NPDES NCS000406, New Hanover County, City of Wilmington, Issued: February 15, 2007
h. Signed consultant or agent authorization form, if applicable.
i. Wetland delineation, if necessary.
j. A signed AEC hazard notice for projects in oceanfront and inlet areas. (Must be signed by property owner)
k. A statement of compliance with the N.C. Environmental Policy Act (N.C.G.S. 113A 1-10), if necessary. If the project involves expenditure
of public funds or use of public lands, attach a statement documenting compliance with the North Carolina Environmental Policy Act.
7. Certification and Permission to Enter on Land
I understand that any permit issued in response to this application will allow only the development described in the application.
The project will be subject to the conditions and restrictions contained in the permit.
I certify that I am authorized to grant, and do in fact grant permission to representatives of state and federal review agencies to
enter on the aforementioned lands in connection with evaluating information related to this permit application and follow-up
monitoring of the project.
I further certify that the information provided in this application is truthful to the best of my knowledge.
Date ~ -Zhu 8'4' Print Name Sterling B. Cheatham
Signature
Please indicate application attachments pertaining to your proposed project.
ODCM MP-2 Excavation and Fill Information ^DCM MP-5 Bridges and Culverts
®DCM MP-3 Upland Development
^DCM MP-4 Structures Information
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Form DCM MP-2
EXCAVATION and F I L L
(Except for bridges and culverts)
Attach this form to Joint Application for CAMA Major Permit, Form DCM MP-1. Be sure to complete all other sections of the Joint
Application that relate to this proposed project. Please include all supplemental information.
Describe below the purpose of proposed excavation and/or fill activities. All values should be given in feet.
Access Other
Channel
(NLW or Canal Boat Basin Boat Ramp Rock Groin Rock
Breakwater (excluding
shoreline
NWL stabilization
Length
Width
Avg. Existing NA NA
Depth
Final Project NA NA
Depth
1. EXCAVATION ®This section'not applicable
a. Amount of material to be excavated from below NHW or NWL in b. Type of material to be excavated.
cubic yards.
c. (i) Does the area to be excavated include coastal wetlands/marsh d.
(CW), submerged aquatic vegetation (SAV), shell bottom (SB),
or other wetlands (WL)? If any boxes are checked, provide the
number of square feet affected.
^CW ^SAV ^SB
^WL ^None
(ii) Describe the purpose of the excavation in these areas:
High-ground excavation in cubic yards.
2. DISPOSAL OF EXCAVATED MATERIAL ®This section not applicable.'
a. Location of disposal area. b. Dimensions of disposal area.
c. (i) Do you claim title to disposal area?
^Yes ^No ^NA
(ii} If no, attach a letter granting permission from the owner.
d. (i) Will a disposal area be available for future maintenance?
^Yes ^No ^NA
(ii) If yes, where?
e. (i) Does the disposal area include any coastal wetlands/marsh
(CW), submerged aquatic vegetation (SAV), shell bottom (SB),
or other wetlands (WL)? If any boxes are checked, provide the
number of square feet affected.
^CW ^SAV ^SB
^WL ^None
(ii) Describe the purpose of disposal in these areas:
f. (i) Does the disposal include any area in the water?
^Yes ^No ^NA
(ii) If yes, how much water area is affected?
RECEIVED
dCM WILMINGTON, NC
O C T 0 8 2001
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~Ot'itY! ®C~ MP-2 (IExcavafian and Felt, Page 2 of 2)
3. SHORELINE STABILIZATION ^This section not applicable
(If development is a wood groin, use MP-4 -Structures)
T..no of chnrolino ~r~tia~~an~n• b. Length:.. 300 ft
^Bulkhead ^Riprap ^Breakwater/Sill ®Other: Cut-off Wall Width: 10 in
c. Average distance waterward of NHW or NWL: d. Maximum distance waterward of NHW or NWL:
Oft
e. Type of stabilization material
Vinyl Sheet Piling
g. Number of square feet of fill to be placed below water level.
Bulkhead backfill Riprap
Breakwater/Sill Other 0 ft
i. Source of fill material.
Fill will only be placed behind the wall, if any at all. It
may come from elsewhere on the site.
f. (i) Has there been shoreline erosion during preceding 12
months?
^x Yes ^No ^NA
(ii) If yes, state amount of erosion and source of erosion amount
information.
Unsure bank has been eroding over time
h. Type of fill material.
Fill will only be placed behind the wall if any at all. It will
be of suitable material and typical to the site.
4. OTHER FILL ACTIVITIES ®This section not app-icable
(Excluding Shoreline Stabilization)
a lil Will fill material be brought to the site? ^Yes ^No ^NA b. (i) Will fill material be placed in coastal wetlands/marsh (CW),
If yes,
(ii) Amount of material to be placed in the water
(iii) Dimensions of fill area
(iv) Purpose of fill
5.: GENERAL
a. How will excavated or fill material be kept on site and erosion
controlled?
Erosion will be controlled by following the erosion control
plan that has been submitted to NC DENR Land Quality.
c. (i) Will navigational aids be required as a result of the project?
^Yes ^No ®NA
(ii) If yes, explain what type and how they will be implemented.
submerged aquatic vegetanon t~r,v~, snCn wuvni t.w~, ~„
other wetlands (WL)? If any boxes are checked, provide the
number of square feet affected.
^CW ^SAV ^SB
^WL ^None
(ii) Describe the purpose of the fill in these areas:
b. What type of construction equipment will be used (e.g., dragline,
backhoe, or hydraulic dredge)?
Cranes, backhoes, dump trucks, and other typical
construction equipment.
d. (i) Will wetlands be crossed in transporting equipment to project
site? ^Yes ®No ^NA c~
(ii) tf yes, explain steps that wi c~e+~~ ~~ieia~rrfinimize
environmental impact~CM b111~MINGTON, Nri
~-~~-a7
Date
Sweeney Water Treatment Plant Expansion
Project Name
Sterling B. Cheatham
Applicant Name
Applicant Signature
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Foirm DCM MP-3
UPLAND DEVELOPMENT
(Construction and/or land disturbing activities)
Attach this form to Joint Application for CAMA Major Permit, Form DCM MP-1. Be sure to complete all other sections of the Joint
Application that relate to this proposed project. Please include all supplemental information.
GENERAL UPLAND DEVELOPMENT
a. Type and number of buildings, facilities, units or structures b. Number of lots or parcels.
proposed. 3 Parcels
Site redevelopment -Water treatment facilities, water tanks,
administration building, two pumping station buildings
c. Density (give the number of residential units and the units per
acre).
0 residential units. Site is approx. 52% built upon. High
Density
e. If the proposed project will disturb more than one acre of land, the
Division of Land Resources must receive an erosion and
sedimentation control plan at least 30 days before land-disturbing
activity begins.
(i) If applicable, has a sedimentation and erosion control plan been
submitted to the Division of Land Resources?
®Yes ^No ^NA
(ii) If yes, list the date submitted: Same date as this application
g. Give the percentage of the tract within the coastal shoreline AEC to h.
be covered by impervious and/or built-upon surfaces, such as
pavement, building, rooftops, or to be used for vehicular driveways
or parking.
Approximately 1.5%
i. Give the percentage of the entire tract to be covered by impervious
and/or built-upon surfaces, such as pavement, building, rooftops,
or to be used for vehicular driveways or parking.
Approximately 52%
j. Describe proposed method of sewage disposal.
Connection to City of Wilmington sewer
I. Describe location and type of proposed discharges to waters of the
state (e.g., surface runoff, sanitary wastewater, industrial/
commercial effluent, "wash down" and residential discharges).
Surface runoff (what cannot be treated), reservoir overflow,
Stormwater overflow, water tank drainage every 5-10 years
d. Size of area to be graded, filled, or disturbed including roads,
ditches, etc.
Approximately 10.52 acres
f. List the materials (such as marl, paver stone, asphalt, or concrete)
to be used for impervious surfaces.
Asphalt, concrete
Projects that require a CAMA Major Development Permit may also
require a Stormwater Cert~cation.
(i) Has a site development plan been submitted to the Division of
Water Quality for review?
®Yes ^No ^NA
(ii) If yes, list the date submitted: Same date as this application
k. Have the facilities described in Item (i) received state or local
approval?
^Yes ®No ^NA
If yes, attach appropriate documentation.
m. Does the proposed project include an innovative Stormwater
design?
^Yes ®No ^NA RECEIVED
If yes, attach appropriate document f1~ ~~f LM~NGTGN, NC

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~~Irm D~~t MP'-3 {U~aland ®evetopment, Page 2 0>~ 2)
m. Describe proposed drinking water supply source (e.g., well,
community, public system, etc.)
Connection to City of Wilmington water
o. When was the lot(s) platted and recorded?
N/A
n. (i) Will water be impounded? ^Yes ©No ^NA
(ii) If yes, how many acres?
p. If proposed development is a subdivision, will additional utilities be
installed for this upland development?
^Yes ^No x^NA
~- ~ ~ ~-'7
Date
Sweeney Water Treatment Plant Expansion
Project Name
Sterling B. Cheatham
Applica Name
~~~...
Applicant Signature
RECEIVED
DCM WILMINGTON, NC
O C T O $ .2007
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Sweeney Water Treatment Plant
Narrative for CAMA Major Permit
Site Description
The subject development, formally identified as the `Sweeney Water Treatment
Plant,' is located in the City of Wilmington (Downtown), New Hanover County,
North Carolina. The approximately 12.43 acre 3-parcel property has frontage
along Hilton Street and the Northeast Cape Fear River. Please note that the site
wil( be permitted and constructed at one time by way of three separate and
simultaneous phases, which have a total limit of disturbance of approximately
10.52 acres. Please reference the attached site location map.
The site is currently developed and used for the Sweeney Water Treatment
Plant, which provides drinking water to the City of Wilmington. Currently, the
site drains by way of overland and piped flow for ultimate discharge to the
Northeast Cape Fear River to the west of the site. The Northeast Cape Fear
River has a watershed classification of SC;Sw according to the surface water
classification database and confirmed by the North Carolina Department of
Environment and Natural Resources (NCDENR) on May 21, 2007, as shown
within the attachments.
The property can be described as mildly sloping in the center of the property,
with much greater slopes along the west, north, and east sides of the property.
The elevations throughout the property range from 8 ft mean sea level (MSL)
near the western portion of the property fronting the river to 37 ft MSL near the
center of the property.
The site is zoned as "Light Industrial" according to New Hanover County parcel
information. The CAMA Land Use Plan indicates that the property is designated
as "Urban." According to the New Hanover County Soil Survey, soils on the site
are considered "Urban Land." A geotechnical survey of the property has been
conducted by an independent geotechnical engineer, and an excerpt from the
resulting report that is applicable to this narrative is included in the appendix.
The seasonal high water table elevation (SHWTE) ranges from approximately 5 ft
below ground surface (BGS) to greater than 7 ft BGS, as confirmed by Vincent
Lewis from NCDENR on August 13, 2007.
The site does contain a small amount of coastal wetlands, as flagged by Robb
Mairs of the NC DENR Division of Coastal Management on December 14, 2006.
Please refer to the wetland survey in the appendix for more information. No
other wetlands are located on the property, as indicated by an environmental
consultant on June 20, 2007, as the site is nearly all built upon, and open areas
Sweeney Water Treatment Plant 2 Of 8
CAMA Major Permit Application

were greatly disturbed in the past. The wetland survey is awaiting verification by
the Army Corps of Engineers. Conversations with Jennifer Frye at the Corps
have indicated that she has completed a "desktop determination" of wetlands on
the site and did not require field verification. Due to the Corps' large backlog of
wetland surveys to certify, our office does not anticipate receiving the signed
survey in the near future. However, after the survey has been signed, it will be
forwarded to the applicable regulatory agencies. It is important to note that the
redevelopment plan for the Sweeney Water Treatment site does not include the
impacting of any wetlands.
Protect Description
The scope of the project includes the expansion of the water treatment plant.
More specifically, a new equalization (EQ) basin, pump station, and clar'rfier tank
will be added on the west side of the property. A pump station will be added on
the east side, buildings will be demolished and rebuilt within the interior of the
site, and new underground piping will be added to various areas of the site. In
addition, the current stormwater management system will be retrofitted to handle
stormwater runoff from the new development, as well as improved mitigation for
runoff from existing, unchanging developed areas. The proposed development
will include approximately 217,199 ft~ of rooftop area, 77,260 ftz of roadway
(includes 3,498 off-site), 9,106 ft2 of sidewalk (includes 97 ft2 from off-site), and
21,622 ft2 parking area. Overall, the project will have a final impervious coverage
of 52.4% whereas the existing impervious coverage is 51.8%.
CAMA Major Plan
A CAMA Major permit will be required for the development due to the activities
proposed within the 75' area of environmental concern (AEC) including the
demolition and removal of a dilapidated building, grading, road improvements,
addition of an equalization basin, and bank stabilization along the eroding
riverbank. Some grading will occur within the 30' buffer, but no proposed
structures will be located within the buffer.
The eroding riverbank will be stabilized using acut-off wall. The cut-off wall will
be made of vinyl sheet piling and will extend approximately 300 linear feet along
the riverbank. The wall will be located above the Normal High Water Line and
coastal wetlands. A cut-off wall has been proposed because it will minimize
riverbank disturbance and avoid vegetation impact, will reduce future erosion
from runoff, and is more easily constructible. It will also allow for the addition of
vegetation on the river side to further stabilize the bank. It will also help to
minimize uncontrolled concentrated points of surface runoff by catching sheet
flow and piping it through the cut-off wall. Please refer to the plans and
especially the details for more information.
Slveeney Water Treatment Plant 3 of 8
CAMA Major Permit Application

Stormwater Management Plan
The impervious surface will be increasing by approximately 0.079 acres.
According to the pre-application meeting held between Cavanaugh and Chris
Baker with the Division of Water Quality on April 16, 2007, it will be necessary for
the water treatment plant to mitigate and capture stormwater runoff from the site
"to the maximum extent practicable." Every attempt has been made to utilize
open space and existing stormwater structures on the property for stormwater
mitigation to the maximum extent practicable. Specific plans for stormwater
runoff management include the use of infiltration basins for maximum total
suspended solids and nutrients removal.
Stormwater from the tributary drainage areas will travel by sheet and shallow
concentrated flow to a series of curb inlets, yard inlets, and vegetated swales for
eventual discharge to five {5) proposed stormwater management basins.
Stormwater will be collected and conveyed from these inlets through a series of
HDPE, RCP, and DIP pipe networks. Untreatable runoff will travel by the same
methods for eventual direct discharge to the Northeast Cape Fear River.
TOTAL SITE AREA• 620,649 ft2 = -~ 14.2481 acres
Impervious Surface Area: 325,187 ftz = -~- 7.4653 acres
Project Built Upon Area =Impervious Surface Area /Total Site Area
7.4653 Acres Impervious / 14.2481 Acres Total = 0.5239 -~ 52.4% Project BUA
Collection and Conveyance
The property and associated roads will be graded in a manner that runoff enters
the stormwater management system by way of sheet flow over the grassed
areas and shallow concentrated flow along the curbs to either curb inlets, yard
inlets, or vegetated swales. Runoff from rooftops will be collected by
downspouts and directly piped to the aforementioned inlets, where the runoff
will then enter the stormwater management system. From the inlets, the
stormwater will be conveyed by way of HDPE, RCP, and/or DIP pipe for
discharge to the five (5) strategically-placed stormwater management basins.
Treatment
The project site is located in a coastal county, but not within'/2 mile of SA:HQW
waters. However, due to the limited amount of available space on the site for
stormwater basins, and the desire of the Water Treatment Plant owners to
effectively treat runoff, infiltration basins have been proposed for the site.
Specifically, five (5) locations have been chosen for the basins: four (4) new
basins are proposed, and one (1) existing basin will be retrofitted to better meet
Sweeney Water Treatment Plant 4 Of 8
CAMA Major Permit Application

the needs of the proposed development. All five locations had SHWfEs ranging
from approximately 5 ft BGS to greater than 7 ft BGS.
Basin 1 is an infiltration basin retrofitted to treat the first 1 " of rainfall runoff from
the surrounding drainage area and any overflow from Basin 4. Basin 1 can
handle approximately 1.7 times the 1" storm event. Basin 4 is an infiltration
basin designed to treat the first 1" of rainfall runoff from its surrounding drainage
area. Basin 4 can handle five times the 1 " storm event and has been oversized
due to its proximity to the adjacent building. Both basins employ the use of riser
barrels for basin overflow protection. In addition, Basin 4's riser barrel has two
(2) 2.5 inch bleed-down orifices that allow for the slow bleed-down of water from
Basin 4. This provides additional water treatment for this infiltration basin to
allow suspended solids to settle. Rip rap aprons will be used in both basins to
dissipate the velocity of the incoming runoff at the entry points to the basins.
Basins 2 and 3 are infiltration basins designed to treat the first 1" of rainfall runoff
from their respective drainage areas. Basin 2 is sized to handle approximately
1.8 times the 1" rain event, and Basin 3 is sized to handle approximately one
time the 1" rain event. Each basin employs the use of a 15 ft emergency
spillway that will ultimately drain to the nearby Northeast Cape Fear River (Basin
2) and Smith Creek (Basin 3). Basin 2 employs the use of a riser barrel for
further basin overflow protection. The riser barrel has two (2) 2.5 inch bleed-
down orifices that allow for the slow bleed-down of water from Basin 2. Rip rap
aprons will be used in both basins to dissipate the velocity of the incoming
runoff at the entry points to the basins.
Basin 5 is an infiltration basin designed to treat the first 1 " of rainfall runoff from
its surrounding drainage area and can handle two times the 1 " storm event.
This basin has a riser barrel with two (2) 2.5 inch bleed-down orifices that allow
for the slow bleed-down of water from Basin 5. In addition, a manhole with an
internal weir will be used before the entry point to the basin from the north to
provide a means for by-passing the basin in an overflow situation. Rip rap
aprons will be used to dissipate the velocity of the incoming runoff at each entry
point to the basin.
Using the computer program Hydraflow, the runoff potentially generated for the
site in its existing state (pre-development) during a 10-year storm was modeled
and equals approximately 86.41 ft3/s. The runoff generated in the post-
redevelopment scenario for the site that will be routed through stormwater
ponds was also modeled fora 10-year storm and equals approximately 33.03
ft3/s. Therefore, the flow was reduced from the pre-development scenario to the
post-development scenario by 53.38 ft3/s fora 10-year storm.
Slveeney Water Treatment Plant 5 Of 8
CAMA Major Permit Application

The proposed stormwater management system has been designed in
accordance with NCDENR requirements and will not adversely affect any
downstream drainage patterns.
Erosion and Sedime_nt_ation Control Strate
The Villages at Turtle Creek will use a temporary vegetative cover to prevent
erosion from any slopes on the project site during land disturbing activities. All
seeded areas will be fertilized, reseeded as necessary, and mulched according
to specifications in the vegetative plan to maintain a vigorous, dense vegetative
cover. Excelsior matting and seeding will be used on slopes steeper than 2:1.
The development will also employ the use of four (4) sediment traps to manage
sediment in stormwater runoff, of which all four (4) will remain for stormwater
mitigation measures. The sediment trap calculations can be found in the
appendix. Please note, approximately 1,825 linear feet of sediment fence will
also be used to control erosion and sediment. An additional 125 (+/-) will be
utilized on the downward slope side of two temporary soil stockpiles: one near
Sediment Basin 2, and one near Gravity Thickener No. 2. In addition, rip rap
will be used to dissipate stormwater flow at conduit discharges and curb cuts.
Given a SC,Sw Watershed Classification and utilizing the Scheuler (Simple)
Method, the sediment traps will be able to store more than the required 3,600
cubic feet of sediment per acre, as depicted within the enclosed calculations for
the sediment traps. To promote adequate settlement of sediment particles in
stormwater runoff, all sediment traps will provide at least 436 ftz of surface area
for every acre of contributing runoff area. In addition to the use of the sediment
traps, sediment fence is proposed at all downstream slopes with controlled
outlets at specified intervals as defined within the notes. Sediment fence will
also be utilized on the downward slope side of soi[ stockpiles to prevent
transport of sediment from these areas.
Sediment Control Calculations:
Total LOD: 10.52 Acres
Area Treated by 4 Sediment Traps: 0.74+0.23+1.13+2.26 = 4.36 Acres
Area Treated by 1,825 LF Sediment Fence:
(0.25 Acres Treatment/100LF Fence) = 0.25/100 * 1,825 LF = 4.56 Acres
Total Treatment: 4.36 + 4.56 = 8.92 Acres
Planned Erosion and Sedimentation Control Practices
1. Construction Sequence -Practice 6.01
The construction sequence for this project is particularly crucial to
mitigating off-site transfer of sediment. The project, as described, will utilize
sediment traps and sediment fence to mitigate the disturbance of (and from
Sweeney Water Treatment Plant 6 of 8
CAMA Major Permit Application

an erosion control standpoint. The use of one retaining wall will
permanently hold back the fill material that will be used during construction
for the area in question.
2. Land Grading -Practice 6.02
Approximately 11 acres of disturbance will be required for the development
of the residential units and associated appurtenances. All fill and cut
slopes will have a maximum slope of 3:1.
3. Temporary Gravel Construction Entrance/Exit -Practice 6.06
Gravel will be temporarily placed in two (2) heavily traveled areas on the
site to provide buffer areas where vehicles can drop their mud and
sediment to avoid transporting it onto pubic roads, to help control erosion
from surface runoff, and to help control dust.
4. Sediment Fencing -Practice 6.62
A sediment fence will be constructed around the down-gradient boundary
of the project to prevent untreated runoff from exiting the site or entering
the coastal wetlands and Northeast Cape Fear River. Sediment fencing will
also be utilized on the down-gradient boundary of the temporary soil
stockpile areas. Please refer to plan set.
5. Controlled Sediment Fence Outlet
Controlled sediment fence outlets will be used in this project to further treat
runoff before it enters the coastal wetlands and Northeast Cape Fear River.
Please reference the details on the attached plan set in addition to plan set.
6. Seeding Schedule -Practices 6.10 & 6.11
Temporary vegetative cover will be implemented through seeding after
every land disturbing activity is completed. Vegetative cover must be
established within 15 working days or 30 calendar days, whichever is
shorter, of land disturbing activity. Permanent cover must be established
prior to completion of the project.
Maintenance Plan
1. All erosion and sediment control practices will be checked for integrity
following every runoff producing rainfall event, or at a minimum, once a
week. Any repairs will be made immediately to maintain the function of the
design measures.
2. Sediment will be removed from the sediment fence when it becomes
approximately one half of a foot deep at the fence base. The sediment
fence will be repaired as necessary to maintain function as a barrier.
Slveeney Water Treatment Plant ~ of 8
CAMA Major Pem~itApplication

3. Sediment will be removed from the sediment traps when it becomes
approximately one half of a foot deep inside the sediment device.
4. The sediment fencing area and collected sediments will be removed and
brought to grade after the contributing area has been properly stabilized.
5. -All seeded areas will be fertilized, reseeded as necessary, and mulched
according to spec'rfications in the vegetative plan to maintain a vigorous,
dense vegetative cover.
6. Contractor to sweep the roadway adjacent to the project site and keep it
clean of sediment as necessary.
Construction Schedule
1. Perform construction stake out.
2. Install temporary gravel construction entrance.
3. Clear site, but do not grub.
4. Install all erosion and sediment control measures.
5. Grub site.
6. Construct sediment traps.
7. Commence rough grading of the site.
8. Install stormwater management appurtenances inclusive of infiltration
basins.
9. Construct sewer collection system.
10. Construct water system.
11. Rough grade the site.
12. Shape shoulders and cut-and-fill slopes.
13. Scarify, seed, fertilize, and mulch all disturbed areas.
14. Install dry utilities (electrical, fiber-optic, cable, phone, etc.).
15. Re-scarify, re-seed, re-fertilize and mulch all disturbed area.
16. Construct roadbed base course and intermediate asphalt course.
17. Apply final asphalt course.
18. After disturbed areas are stabilized with vegetation, the contractor shall
return to the site and remove all temporary erosion control measures.
Vegetation Plan
1. The contractor shall provide seeding and mulching on all disturbed areas
within fifteen working days or thirty calendar days, whichever period is
shorter, following the completion of any phase of grading. Seeding
requirements shall include soil preparation, seed mixtures, and mulching.
2. Contractor shall provide sod cover on all areas or comply with permanent
seeding schedule.
Slveeney Water Treatment Plant 8 of 8
CAMA Major Permit Application

Final Environmental
- ~~~~~ Assessment -
- Sweeney WTP Expansion
Executive Summary
EXECUTIVE SUMMARY
This project consists of an Environmental Assessment (EA) pursuant to the State Environmental Policy Act
(SEPA} to allow the City of Wilmington to apply for approval to expand the Sweeney Water Treatment
Plant (WTP) from a treatment capacity of 27.5 million gallons per day (mgd) to a fmal capacity of 44 mgd.
The Sweeney WTP will be designed for a treatment capacity of 44 mgd, but will initially have a permitted
capacity of 35 mgd, pending demonstration testing to re-rate the new filters. Since the water treatment
plant capacity increase is greater than 1 mgd, an EA and a Finding of No Significant Impact (FONSI) are
required before the North Carolina Division of Environmental Health (DEH) will issue permits and
approvals for this project.
The City of Wilmington's water treatment and distribution system is entirely owned and operated by the
City. The City operates the 27.5 mgd Sweeney WTP providing water to customers within the limits of the
City's distribution system as well as a variety of commercial, governmental, and industrial customers. The
Sweeney WTP consists of two parallel plants that are referred to as the South Plant (1943 plant) and the
Narth Plant (1998 expansion}. The Sweeney WTP treats surface water from the Cape Fear River either
pumped from its own intake or purchased from the Lower Cape Fear Water and Sewer Authority
(LCFWASA).
Water is a regional resource, and local governments must begin working together in order to ensure that
adequate water quality and supply are available for years to come. The City of Wilmington has discussed
future water supply needs with New Hanover County, Carolina Beach, and Wrightsville Beach. The City
has secured verbal agreements with the Town of Carolina Beach and the Town of Wrightsville Beach to
provide both of these communities a maximum of 1 mgd each. The City also plans to serve some areas of
'` New Hanover County south of the City limits that currently rely on groundwater resources. The 2005
Water System Master Plan determined that the City of Wilmington will require additional water treatment
capacity by 2010 and recommended that the City evaluate alternatives for expanding the Sweeney WTP as
soon as possible. Expansion of the City's existing WTP was determined to be the most cost-effective
,~ alternative for the City, but it will also benefit the area by providing a reliable source of high quality
drinking water to citizens and businesses.
The City of Wilmington requests approval for this expansion in order to meet the projected demands of the
existing service area and to provide water to neighboring communities where ground water resources aze
limited. These neighboring systems obtain their water supply from wells5 which are experiencing
increasing chloride concentrations due to saltwater intrusion. The City's raw water intake on the Cape Fear
River is protected from saltwater intrusion by Lock and Dam No. 1. The City will be unable to meet these
additional needs without the proposed project.
The proposed service area for this project encompasses 71 square miles, including the City of
_ Wilmington's existing water system service area, the existing water service areas for Carolina and
Wrightsville Beaches, un-served areas south of the City including the Cameron Property, and the se
RE~~N~D
ARCADIS ProjeclNo. NC706001.0002 DCM W~Liv1~~GTG~~ NC
1
~, DEC 0 5 200:

Final Environmental
Assessment -
~~~~~ Sweeney WTP Expansion
Executive Summary
area for the Monterey Heights water system served by New Hanover County. The project area includes the
Sweeney WTP, the City's Kings Bluff Pump Station and raw water intake site, the LCFWASA Pump
Station and raw water intake site, and the 25-mile long and 50-foot wide raw water transmission main
easement that extends from the Kings Bluff Pump Station to the Sweeney WTP.
The proposed project will include upgrades to the existing Sweeney WTP from 27.5 mgd to 44 mgd. The
City obtains its raw water from the Cape Fear River via the Kings Bluff Pump Station and intake and the
LCFWASA Pump Station and intake, located upstream of Lock and Dam No. 1. Additional raw water will
be withdrawn from the Cape Fear River by the LCFWASA intake and provided to the Sweeney WTP
facility via the LCFWASA raw water transmission main. The City and the LCFWASA recently signed a
new contract to increase raw water purchased from the LCFWASA from 15 mgd to 23 mgd, which
represents the maximum amount that the LCFWASA can supply with its existing infrastructure. This
increases the City's total raw water transmission capacity to 36 mgd, which will meet its water supply
needs to the 2010-2015 timeframe. The City intends to meet its long-term water supply needs through bulk
purchases from the LCFWASA. The LCFWASA will need to expand its facilities by 2015 to meet the
long-term needs of the City and its other customers, which will be addressed in a separate SEPA document.
As a result of the proposed project, the South Plant will be decommissioned and demolished, and a new
plant will be constructed in its place. The North Plant will continue to operate at a capacity of 12.5 mgd.
,~ The proposed project will allow the existing plant to remain in service during the construction process.
Direct impacts from the proposed project include impacts resulting from the upgrades to the Sweeney WTP
site and impacts to the Cape Fear River from withdrawal of additional raw water. Construction activities at
"'` the WTP site will result in temporary impacts, and increased withdrawal from the Cape Fear River will
have minimal impact on river flows and no impact on the water quality of the river. The combined water
.withdrawals for the City and the LCFWASA are projected to reach 106 mgd by 2030, which is less than
20% of the 7Q10 flow. No significant direct impacts will occur from the proposed project.
Secondary and cumulative impacts resulting from the proposed project are anticipated to occur from
increased development within the service area. Strong local programs currently in place and under
consideration by the City of Wilmington, New Hanover County, the Town of Carolina Beach, and the
Town of Wrightsville Beach will help to offset potential indirect and cumulative impacts that may result
from the proposed project. These programs include growth management, open space preservation, erosion
and sedimentation control, stormwater, floodplain management, water conservation, groundwater
management and wellhead protection.

RECEIVED
DCM WILMINGTON, NC
D ~ ~ U 5 2007
ARCADIS Project No_ NC706001.0002

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®2 - organic material ~ 5 - clayey silt to silty clay 8 - sand to silty sand €8 11 -very stiff fine grained (*)
3 - clay ^ 6 - sandy silt to clayey silt 9 - sand !~ 12 - sand to clayey sand (*)
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>~CITY OF WILMINGTON, NORTH CAROLINA _
o BLACK & VEATCH
SWEENEY WATER TREATMENT PLANT EXPANSION ©. Building a VyOfld of ditterence•
Black & Veatch International Company
8620 Cliff Cameron Drlv~. Bulls 210
SI TEWORK CMr1otN. North C~rolln. 28288
C1ry, Nonh CuoIIn1 27616
DATE REVISIONS AND RECORD OF ISSUE N0. tlT ~
CYGNET I0: 113126-7100-WWTUP~C-NOOOONSVS XREF I:C-NEW UYOUT.OwB
~; CgNA.,.~ XREF2:C-Si replan-Nester. tlwp
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