20211761 Ver 1_PCN Exhibit 2017 Aerials Sewer Rehabilitation_Resubmittal_20211203

Attachment
Revised 11/15/2021
2017 Aerial Sewer Replacement Project
Description of Project Changes
The following information is submitted in reference to the previously approved (July 23, 2019) impacts
for the 2017Aerial Sewer Replacement Project, Division reference DWR #19-0724. Per the conditions of
the approval, the applicant is required to notify the Division of changes to the project. Changes to the
original project description and impact quantities are shown in italics.
State Street changes
During development of final plans and erosion and sediment control plans for the State Street site, minor
modifications of the project limits and extension of erosion control measures created changes in the
stream, wetland, and buffer zone impacts for the site:
• The total quantity of aerial sewer replaced at the State Street location was increased by
approximately 97 feet for a total of 1,447 linear feet.
• During the erosion and sediment control design, temporary stream crossings were extended to
provide stable crossings for construction equipment. Therefore, total temporary stream impacts
increased by 16 feet for a total of 48 linear feet of temporary stream impacts as shown in Table 2.
• Additionally, total temporary wetland impacts increased by 140 square feet to 27,780 square feet.
• Total temporary and permanent buffer zone impacts increased in both Zone 1 and Zone 2. Total
buffer zone impacts are provided in Table 3.
Banbury Road changes
The originally proposed sewer realignment for the Banbury Road site was revised to remove impacts to
multiple adjacent properties and provide permanent access for sewer operation and maintenance. The
proposed sewer location and depth will remove deteriorated aerial sewer segments that are subject to
failure from runoff and channel erosion. Based on the proposed realignment the following changes and
buffer zone impact changes for the site are:
• The total quantity of sewer replaced at the Banbury Road location was increased by 277 linear feet
for a total of 550 linear feet.
• Total temporary and permanent buffer zone impacts increased in both Zone 1 and Zone 2. Total
buffer zone impacts are provided in Table 4.
• There are no stream impacts and no wetland impacts for the Banbury Road site.
Project plan exhibits for the 2017Aerial Sewer Replacement project are attached and display the revised
impacts for streams, wetlands, and buffer zones for the State Street and Banbury Road sites as
applicable.
Page 1 of 5

Attachment
Revised 11/15/2021
Project Description
The purpose of the project is to repair or replace existing deteriorated sewer assets, for the City of
Raleigh Public Utilities Department, in order to sustain proper function and reduce maintenance efforts.
The project consists of two (2) sites located in the Neuse River basin that will result in stream, buffer,
and wetland impacts: State Street and Banbury Road. Project location and water quality information for
each site are provided in Table 1.
Table 1. Project Location and Water Quality Information
Project Sites Latitude Longitude Name of Nearest Water Quality 12-digit HUC
Body of Water Classification of nearest
receiving water
State Street 35.7567-78.6189 Walnut Creek C; NSW 030202011101
Banbury 35.8095-78.6665 Southeast Prong C; NSW 030202010804
Road Beaverdam Creek
State Street
Proposed work within the riparian buffers and wetlands consists of the following:
• Replacement of approximately 1,447 linearfeet of aerial sanitary sewer,
• Replacement of approximately 13 steel piers,
• Sand blast and repaint 17 existing steel piers.
The total temporary stream disturbance associated with this work will be approximately 48 linearfeet
and will be due to construction of temporary stream crossings to access the repair areas. Table 2
presents a summary of the temporary stream impacts identified on Sheets 2 & 3 of the attached plan
exhibits.
The total temporary wetland impact (W1) associated with the work at State Street will be approximately
0.637 acres (27,779.8 sq ft).
The permanent and temporary buffer zone impacts for the State Street site are totaled in Table 3 below:
*Temporary and permanent impact areas are delineated on Sheets 2 & 3 of the attached plan exhibits.
Below are photos of the existing conditions at State Street.
Page 2 of 5

Attachment
Revised 11/15/2021
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Photo 1— State Street: Part of the aerial sewer and piers to be replaced
Photo 2 — State Street: Part of the aerial sewer to be replaced (1-40 to the left)
Page 3 of 5

Attachment
Revised 11/15/2021
Photo 3 — State Street: Aerial sewer crossing Walnut Creek (Walnut Creek Trail is on the far side)
Banbury Road
Proposed work within the riparian buffers consists of the following:
• Replacement of approximately 550 linear feet of 8" ductile iron sanitary sewer,
• Replacement of approximately 197 linear feet of 6" ductile iron sanitary sewer with 8" ductile
iron sanitary sewer,
• Replacement of 1 existing manhole and installation of 5 new manholes,
• Removal of existing aerial sewer pipe and piers.
The total permanent buffer impacts associated with the work at Banbury Road will be approximately
4,256 sq. ft. in Zone 1 and 4,352 sq ft in Zone 2. The total temporary buffer impacts associated with the
work at Banbury Road will be approximately 3,593 sq. ft. in Zone 1 and 3,362 sq. ft. in Zone 2. Table 4
presents a summary of the temporary stream impacts identified on Sheets 4 & 5 of the attached plan
exhibits.
Table 4. Banbury Road Buffer Zone
Buffer Impact Temporary Total
Impacts
Permanent Total
Zone 1 3,593 sq. ft
4,256 sq. ft
Zone 2 3,362 sq. ft
4,352 sq. ft
*Temporary and permanent impact areas are delineated on Sheets 4 & 5 of the attached plan exhibits.
Impact Justification and Mitigation
The proposed replacement of sanitary sewer at Banbury Road will not increase capacity of the sanitary
sewer system and is not intended to serve newly developed areas now or in the future. The replacement
of the existing 6" ductile iron pipe with 8" ductile iron pipe and new manholes are being brought up to
Page 4 of 5

Attachment Revised 11/15/2021
the City of Raleigh Public Utilities standards. The existing sanitary sewer alignment is primarily located in
the riparian buffer zone 1 of the unnamed tributary of Beaverdam Creek. The proposed realignment of
the sanitary sewer will mainly be located evenly between buffer zone 1 and zone 2 and will serve as an
improvement to the riparian buffer of the affected tributary.
Erosion control measures such as silt fence, coir fiber matting, temporary stream crossings and
construction entrances will be used to prevent sedimentation during construction. Stream and buffer
disturbances will be the minimum necessary to allow for the replacement and rehabilitation of existing
sewer. Streams and buffers will be restored to original contours and stabilized and revegetated upon
completion of the project. Work areas will be confined to the minimum extent necessary to perform the
work. Disturbed areas will be perpendicular to the buffer to the extent possible. Erosion control devices
and measures will be installed prior to construction and work will be scheduled during a dry period
when stream flow is low or zero.
Equipment to be used for construction includes haul trucks to transport materials needed to and from
the sites and mechanized pile drivers for installing the aerial sewer piers. Percussive activities will be
limited to installing the aerial sewer piers that are necessary for the State Street site. These activities will
only take place between the working hours of 8:00 AM and 4:00 PM. Since the work site is in close
proximity to 1-40 and other busy roadways, the limited use of the pile drivers should not cause major
noise concerns. Endangered species are not known to be in the areas of the proposed work.
Page 5 of 5

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RIPARIAN BUFFER MIX
RECOMMENDED APPLICATION RATE: 20-25 LBS. PER ACRE
SCIENTIFIC NAME
COMMON NAME
PERCENT
AGROSTIS PERENNANS
AUTUMN BENTGRASS
15
ANDROPOGON GERARDII
BIG BLUESTEM
10
COREOPSIS LANCEOLATA
LANCELEAF COREOPSIS
10
ELYMUS VIRGINICUS
VIRGINIA WILDRYE
20
JUNCUS EFFUSUS
SOFT RUSH
5
PANCIUM VIRGATUM
SWITCHGRASS
15
RUDBECKIA HIRTA
BLACKEYED SUSAN
10
SCHIZACHYRIUM SCOPARIUM
LITTLE BLUESTEM
5
SORGHASTRUM NUTANS
INDIAN GRASS
5
TRIPSACUM DACTYLOIDES
EASTERN GAMAGRASS
2
* SEED SHOULD BE APPLIED AND MAINTAINED IN ACCORDANCE WITH LOCAL NURSERY RECOMMENDATIONS.
RIPARIAN BUFFER MIX
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WETLAND SEED MIX
RECOMMENDED APPLICATION RATE: 20-25 LBS. PER ACRE
SCIENTIFIC NAME
COMMON NAME
PERCENT
ELYMUS RIPARIUS
RIVERBANK WILD RYE
20
AGROSTIS STOLONIFERA
CREEPING BENTGRASS
15
CAREX VULPINOIDEA
FOX SEDGE
12
PANICUM VIRGATUM
SWITCHGRASS
15
POA PALUSTRIS
FOWL BLUEGRASS
15
DICHANTHELIUM CLANDESTINUM
DEER TONGUE
8
BIDENS ARISTOSA
BIDENS
7
JUNCUS EFFUSUS, NC ECOTYPE
SOFT RUSH
4
SAGITTARIA LATIFOLIA
DUCK POTATO
2
SAURURUS CERNUUS
LIZARDS TAIL
2
* SEED SHOULD BE APPLIED AND MAINTAINED IN ACCORDANCE WITH LOCAL NURSERY RECOMMENDATIONS.
C ETLAND SEEDING DETAIL AECOM

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