NC0023884_Environmental Assessment_19950504

State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Environmental Management
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
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May 4, 1995
MEMORANDUM
TO: Chrys Baggett,������S,,,tate Clearinghouse
FROM: Monica Swiharte,water Quality Planning Branch
SUBJECT: Environmental Assessment/Finding of No Significant Impact
Yadkin River Effluent Outfall and Regional Wastewater
Treatment Plant, Rowan County, Yadkin 03-07-04
Enclosed are ten copies -of the subject EA/FONSI for State
Clearinghouse review. The document has been reviewed by the
Department of Environment, Health, and Natural Resources (DEHNR)
and has been approved for release to the State Clearinghouse.
Please contact me if you have any questions or need additional
information. I would appreciate if you would send a coLy of the
document to Ms. M. Gantt at the US Fish and Wildlife Service's
Raleigh Field Office. Thank you for your assistance.
Enclosures
cc: Mooresville Regional Office
Permits and Engineering
Melba McGee (Ref:project #714)
John Vest, City of Salisbury
Michael Acquesta, Peirson & Whitman
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Teiephone 919-733-7015 FAX [phone]
An Equal opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper

FINDING OF NO SIGNIFICANT IMPACT
Yadkin River Effluent Outfall and
Regional Wastewater Treatment Plant
City of Salisbury, Rowan County
An environmental assessment (EA) has been prepared, pursuant
to the requirements of the North Carolina Environmental Policy Act,
for the City of Salisbury's proposed Yadkin River effluent outfall
that would include combining the flows from the 7.5 million gallons
per day (MGD) Grant Creek and the 5.0 MGD Town Creek wastewater
treatment plants (WWTP). An EA/FONSI was previously circulated
through the State Clearinghouse for the proposed elimination of the
effluent outfall from Grant Creek and the construction of
wastewater treatment facilities for a discharge relocation to the
Yadkin River. The environmental review for this project was
completed on December 1, 1994.
This current EA covers the elimination of the effluent outfall
from Town Creek through the construction of a 5.0 MGD pump station
and approximately 15,000 feet of force main from the pump station
to the Grant Creek WWTP . Flows from the two WWTPs would be combined
and treated.in a chlorination/dechlorination/post aeration system
between the Grant Creek WWTP and the Yadkin River, prior to
discharge into the Yadkin River. The existing plants at Town Creek
and Grant Creek would be abandoned except for the influent pump
stations and other primary treatment facilities.
The EA also evaluates a future 20 MGD regional wastewater
treatment plant with a discharge to the Yadkin River. The regional
plant would be built when a treatment capacity of more than 12.5
MGD is needed to serve Salisbury and its neighboring
municipalities. Ultimately, the plant could potentially serve most
of the communities in Rowan County. The plant would be built and
permitted for treating 20 MGD, but would be built to accommodate
expansion in 20 MGD increments up to 106 MGD.
This EA and Finding of No Significant Impact (FONSI) are
prerequisites for the issuance of a nondischarge and NPDES
discharge permit by the Division of Environmental Management for
the construction of this project.
It is concluded that the proposed project will not result in
significant impacts to the environment provided that it is carried
out in accordance with the impact avoidance/mitigation measures
contained'in the EA. Pending approval by the State Clearinghouse,
the environmental review for this project will be concluded. An
environmental impact statement will not be prepared for this
project.
North Carolina
Division of Environmental Management
May 4, 1995

EXECUTIVE SUMMARY
WASTEWATER TREATMENT FACILITIES
CITY OF SALISBURY, NORTH CAROLINA
MAY 20, 1994
UPDATED MARCH 21, 1995
PEIRSON & WHITMAN ARCHITECTS AND ENGINEERS, P.A.
5510 MUNFORD ROAD
RALEIGH, NORTH CAROLINA 27612
P&W PROJECT NO. 1100

I. INTRODUCTION:
In order to provide for an orderly implementation of major
wastewater treatment facilities capital projects, the City of
Salisbury has directed Peirson & Whitman Architects and Engineers,
P.A., to prepare a 20-year planning study addressing the City's
needs in this area. Rather than simply react to the increasingly
stringent and all encompassing environmental regulations being
continuously, it seems, imposed on the City's wastewater treatment
plants, the City of Salisbury believes it is in its best interest
to study the situation and to make well considered plans, not only
to comply with the regulations, but to allow for foreseen growth
and probable future regulations.
The purpose of this Executive Summary is to present some of
the initial -ideas being considered as long range solutions to the
City's wastewater treatment concerns.
II. BACKGROUND:
The City of Salisbury owns and operates two (2) secondary
level, activated sludge wastewater treatment plants:
Current
Capacity Flow
Town Creek WWTP 5.0 MGD 3.2 MGD -
Grant Creek WWTP 7.5 MGD 4.0 MGD
Appendix A and Appendix B contain a description of the current
NPDES Permit Limits for each plant.
The Town Creek plant was originally constructed in 1935 and
upgraded through the years, with the final expansion to 5.0 MGD in
1970. The Town Creek WWTP discharges into Town Creek. The Grant
Creek plant was originally placed in operation in 1964. In 1973,
alterations and additions were made to increase the capacity to 5.0
MGD. In 1987, the plant was expanded again to 7.5 MGD with aerobic
sludge digestion added in 1990. The Grant Creek WWTP discharges
into Grant Creek.
Both of these plants are designed for removal of BODS, TSS,
and ammonia, and are capable of meeting current NPDES permit
limits, summer and winter. Due to the increasingly stringent water
quality requirements being imposed by the N. C. DEM, the City of
Salisbury can expect total phosphorous and total nitrogen limits on
both plants. The existing plants will not remove phosphorous and
nitrogen. Therefore, as a minimum, the existing plants must be
modified to provide treatment of these nutrients.
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Wastewater nutrients, phosphorous and nitrogen, are akin to
fertilizers that are used on residential lawns and on agricultural
fields. Fertilizers make lawns and crops grow green and tall.
Wastewater nutrients have the same effect on aquatic plants, mainly
green algae. The growth of these algae in rivers and lakes is,
first, unsightly, and diminishes water clarity. But more
importantly, the increased algae disturbs the natural environmental
balance in the river or lake. When the algae dies, it sinks to the
river or lake bottom, where, as it decays, it removes oxygen from
the water; oxygen needed by the other inhabitants of the river or
lake. Because of its negative aesthetic effect, and because of the
depletion of oxygen that it causes, algae growth must not be
artificially enhanced. Removal of wastewater nutrients is one way
of controlling this problem. The State of North Carolina is
strongly pursuing nutrient removal from wastewater treatment plant
effluent. It is expected that nutrient removal will be mandated in
the Yadkin River Basin within the near future.
The selected strategy is based on:
1. continued use of existing plant facilities whenever
possible;
2. the knowledge that nutrient removal for total nitrogen
and total phosphorus will be required for NPDES permits
issued on the Yadkin River Basin;
3. the knowledge that heavy metals (such as mercury) limits
will continue to be included in NPDES permits issued on
the Yadkin River Basin; and
4. the limited capacity of Town Creek and Grant Creek to
receive treated wastewater.
The City of Salisbury has been told that continued discharge
of treated wastewater into Town Creek and Grant Creek will be
limited and has been discouraged by DEM. An alternative directed
toward securing a discharge directly into the Yadkin River must
therefore be included in the overall planning effort.
The confluence of Town Creek with the Yadkin River is in the
estuarine waters of High Rock Lake. The State has strongly
discouraged piped discharges at such locations. Therefore, it is
not practical to continue the discharge of treated wastewater
directly to the Yadkin River on the Town Creek Basin.
The confluence of Grant Creek with the Yadkin River occurs in
a reach of the river which is free flowing. However, direct
discharge of treated wastewater to the river at this point is
discouraged by the State. The existing Grant Creek Treatment Plant
permit has discharge limits which the existing plant can meet when
operated properly.
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Neither the Grant Creek Treatment' Plant nor the Town Creek
Treatment Plant is capable of removing total nitrogen and total
phosphorus.
III. POPULATION PROJECTIONS:
Wastewater treatment needs and design capacities for
Salisbury's wastewater treatment facilities will be determined, at
least partially, by population growth. The planning period and
resulting population forecasting will be for 20 years. Population
data and population predictions have been gathered from the U. S.
Census Bureau and the N. C. Office of State Budget and Management.
The Salisbury Planning Area, which with the construction of
the Rockwell wastewater conveyance system will encompass all
municipalities in Rowan County except Spencer and Cleveland (it is
expected that Faith, presently unsewered, will connect to the
Salisbury system within the planning period), has grown
consistently during the twentieth century at approximately the same
rate as Rowan County. Table III-1 shows the past population for
Rowan County and the Salisbury Planning Area. Population
projections for the City of Salisbury and for the 201 Planning Area
are summarized in Table III-2.
TABLE III-1
PAST POPULATIONS
Percent
Year
Rowan County
Increase
1910
37,521
-
1920
44,062
17.4
1930
56,665
28.6
1940
69,206
22.1
1950
75,410
9.0
1960
82,817
9.8
1970
90,035
8.7
1980
99,186
10.2
1990
100,605
1.4
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TABLE III-2
PROJECTED POPULATIONS
Planning
Year
Salisbury
Area
1993
23,770
50,966
2000
24,600
52,746
2010
26,100
55,962
2015
26,900
57,677
IV. WASTEWATER FLOW PROJECTIONS:
The average daily flow at the Grant Creek WWTP in 1993 was
4.16 MGD, of which 0.310 MGD was contributed by Landis and 0.534
MGD was contributed by China Grove. Of the remaining 3.316 MGD
attributed to the City of Salisbury, 2.772 MGD is considered as
residential flow and 0.554 MGD as industrial flow. The average
daily flow at. the Town Creek WWTP in 1993 was 3.7 MGD, of which
0.18 MGD was contributed by Granite Quarry, 0.25 MGD was
contributed by East Spencer, and 3.27 MGD was contributed by
Salisbury. Of the Salisbury portion, 1.82 MGD is considered as
residential and 1.45 MGD as industrial. Rockwell's expected flow
at completion of it's conveyance system is 0.20 MGD. Faith's
projected flow for 1995 is 0.046 MGD.
Using the 1993 Planning Area population and the 1993
residential flows for the Grant Creek and Town Creek wastewater
treatment plants and adding in the -flows for Rockwell and Faith,
the total projected 1995 Planning Area wastewater flow is 3.95 MGD.
The projected year 2015 flow for the Town Creek basin is 4.487 MGD.
The N. C. Division of Environmental Management requires a
municipality to begin planning for a [plant expansion and/or
upgrade when the flow reaches 80 % of its permitted capacity, and to
have design complete, and ready to construct at the 90% hydraulic
capacity mark. This does not take into consideration plant
upgrades due to more stringent effluent limits. Based on the
projections contained herein, the 80% capacity point will be
reached within 3-4 years.
Using the Town of Landis' 1993 population of 2,355 and a
wastewater flow of 310,000 GPD, a per capita flow of 131.6 GPD can
be calculated. Applying this per capita flow to the projected
Landis population of 3,000 in the year 2015 results in a projected
flow of 0.395 MGD in the year 2015. For the Town of China Grove,
a 1993 population of 2,784 was reported along with a wastewater
flow of 534,000 GPD. This results in a per capita flow of 191.8
GPD which can be applied to the projected population of 4,010 for
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an estimated wastewater flow of 0.769 MGD in the year 2015. The
per capita flow for the City of Salisbury's Grant Creek Basin is
calculated at 116.3 GPD and is based on a residential flow in 1993
of 2.502 MGD and a population of 23,770. In the year 2015, the
Grant Creek basin population is estimated to be 26,900 and the
residential wastewater flow is estimated to be 3.14 MGD.
Salisbury's future industrial wastewater flow can be estimated by
using a 10% unspecified growth rate over the entire design period.
This will result in the 1993 industrial flow of 0.554 MGD
increasing to 0.620 MGD by the year 2015. Additionally, a
considerable number of discussions have been held regarding the
installation of sanitary sewer facilities to connect an existing
industry located west of the City of Salisbury on Highway 70 to the
Salisbury sewer system. This connection is strongly anticipated
to occur before 1998. At present, this industry discharges 1.1 MGD
of treated wastewater into Second Creek. It is expected that this
industry`s wastewater flow will increase to 2.3 MGD by 1998, hence
the need to connect to the Salisbury sewer system. The total
project year 2015 flow to the Grant Creek WWTP would therefore be
7.224 MGD.
Contributor
Landis
China Grove
Salisbury -
Total
TABLE-III-3
PROJECTED WASTEWATER FLOWS
GRANT CREEK WWTP
Residential
Unspecified Industrial
Specified Industrial
1993
Flow (MGD)
0.310
0.534
2.772
0.554
-0-
4.170
2015
Flow (MGD)
0.395
0.769
3.140
0.620
2.300
7.224
Using the Town of Granite Quarry's 1993 population of 1,669
and a wastewater flow of 180,000 GPD, a per capita flow of 107.85
GPD can be calculated. Applying this per capita flow to the
projected Granite Quarry population of 1,889 in the year 2015
results in a projected flow of 0.204 MGD in the year 2015. For the
Town of East Spencer, a 1993 population of 2,181 was reported along
with a wastewater flow of 253,200 GPD. This results in a per
capita flow of 116.09 GPD which can be applied to the projected
year 2015 population of 2,468 to yield an estimated wastewater flow
of 0.287 MGD in the year 2015. The Town of Rockwell's future
wastewater flow was estimated at 0.310 MGD in the recent Rockwell
amendment to the Greater Salisbury 201 Facilities plan. Using the
Town of Faith's 1993 population of 554 and an estimated wastewater
- 5 -

flow (provided by Tate Lanning and Associates) of 46,000 GPD, a per
capita flow of 83 GPD can be calculated. Applying this per capita
flow to the projected Faith population of 627 in the year 2015
results in a projected flow of 52,047 GPD in the year 2015. The
per capita flow for the City of Salisbury's Town Creek Basin is
calculated at 182 GPD and is based on a residential flow in 1993 of
1.82 MGD and a population of 10,000. In the year 2015, the
population is estimated to be 11,317 and the residential wastewater
flow can be calculated at 2.06 MGD. Salisbury's future industrial
flow can be estimated by a 10% unspecified growth rate over the
entire planning period. This will result in the 1993 industrial
flow to Town Creek WWTP increasing from 1.45 MGD to 1.6 MGD. The
total project year 2015 flow to the Town Creek WWTP would therefore
be 4.513 MGD.
TABLE III-4
PROJECTED WASTEWATER FLOWS
TOWN CREEK WWTP
1993
2015
Contribution
Flow MGD
Flow MGD
Granite Quarry
0.180
0.204
East Spencer
0.253
0.287
Rockwell
0.200
0.310
Faith
0.046
0.052
Salisbury -Residential
1.820
2.060
-Unspecified Industrial
1.450
1.600
Total
3.704
4.513
Based on the above analyses, the Grant Creek WWTP will be at
its hydraulic capacity by the end of the planning period. The Town
Creek WWTP will be at approximately its 80% capacity mark when
Rockwell begins discharge to the plant thus triggering the
requirement to begin planning for future expansion. The plant has
already exceeded the 90% capacity point three consecutive months in
1993. Per discussions with the N.C. Division of Environmental
Management on May 20, 1994, it is expected that nutrient limits
will be imposed on the Town Creek and Grant Creek discharge at the
time basin -wide permitting is initiated, in 1998. At that time,
either the existing plants will have to be modified to meet these
limits or a new plant will have to be constructed.
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IV. WASTEWATER TREATMENT ALTERNATIVES:
A. INTRODUCTION•
There are several alternatives that need to be considered
in order to achieve the environmental goals and discharge limits
established for the Grant Creek and Town Creek Wastewater Treatment
Plants. These alternatives include the Do -Nothing Plan, optimal
performance of the existing wastewater treatment facilities,
upgrading of the Grant Creek WWTP to meet nutrient limits and the
expected increased flow, upgrade and expansion of the Town Creek
WWTP to meet nutrient limits and the expected increased flow, and
directing work towards a completely new future plant on the Yadkin
River to replace both existing plants.
B. PLAN 1 - DO-NOTHING:
Under this plan, the existing Grant Creek WWTP and the
existing Town Creek WWTP would continue in their current state
discharging to their respective creeks. Because of the relatively
low flow in both creeks (low 7Q10 flows), the discharge limits,
including those for metals and chronic toxicity, will continue to
be reduced by the State through more stringent NPDES permit
requirements. Additionally, nutrient limits will be imposed on the
discharges from these plants in the future. Without modifications
to the plants, they will not be able to meet the anticipated permit
limits. Neither plant as it now exists is capable of meeting
nutrient limits. Also, these plants were not designed to remove
metals. The Do -Nothing Plan is not desirable and would not allow
the plant to meet the conditions of the current and future NPDES
permits. Therefore, it will not be considered further.
C. PLAN 2 - OPTIMAL PERFORMANCE OF EXISTING FACILITIES:
This plan will examine the level of treatment that could
be obtained from the best possible performance of the existing
treatment facilities at each plant.
1. Grant Creek Plant:
When operated properly, the extended aeration
activated sludge process at the Grant Creek Wastewater Treatment
Plant should be capable of meeting the current summer NPDES permit
limits -for BOD5 (15 mg/1), TSS (30 mg/1), and NH3-N (6 mg/1). The
existing facilities should also be capable of meeting the limits
for dissolved oxygen, fecal coliform and pH. With the recent
removal of accumulated sludge from the aeration basin, the
facilities appear to be able to meet the current limits for
mercury, chromium, lead and fluoride.
When the new basin -wide NPDES Permit is issued in
1998, it is anticipated that more stringent effluent limits will be
imposed along with the requirement for nutrient removal. Also,
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soon after the issuance of the new permit, it is expected that the
flow to the plant will exceed 80% of the plant capacity with the
addition of flow from an existing industry. Once the plant flow
exceeds 80% of the permitted capacity or effluent limits are
imposed that the existing plants cannot meet, Salisbury will be
required to begin preparation and planning for a plant expansion
and/or upgrade.
Because of these specific factors, optimal
performance of the existing plant is not an acceptable solution to
the wastewater treatment requirements for the Grant Creek basin in
Salisbury. This alternative will not be considered further.
2. Town Creek Plant:
When operated properly, the extended aeration
process at the Town Creek Wastewater Treatment Plant should be
capable of meeting its current summer NPDES permit limits with
little difficulty. However, the plant is not capable of removing
nutrients, a requirement expected to be included in the plant's
future permits. (See Appendix C). Therefore, continued optimal
performance of the existing plant is not an acceptable solution to
the wastewater treatment requirements for the Town Creek basin in
Salisbury. This alternative will not be considered further.
D. PLAN 3A - MODIFICATIONS TO GRANT CREEK WASTEWATER
TREATMENT PLANT - GRANT CREEK DISCHARGE:
Under this plan, the Grant Creek wastewater treatment
plant will be modified to provide nutrient removal, post aeration
and dechlorination. Expansion of the plant's hydraulic capacity
will not be considered under this plan. This alternative consists
of post clarification with alum addition for phosphorus removal,
deep bed tertiary filtration with methanol feed for total nitrogen
removal, plus additional sludge thickening, digestion, dewatering
and handling facilities to take care of the increased sludge
production. Post aeration will be provided for the entire plant
flow as well as dechlorination. Because of the age of the existing
equipment, much of the old plant infrastructure must be replaced or
refurbished in order to provide a full 20 year service life.
Discharge will be at the existing point in Grant Creek.
E. PLAN 3B MODIFICATIONS TO TOWN CREEK WASTEWATER
TREATMENT PLANT - TOWN CREEK DISCHARGE:
This alternative consists of the construction of a new
influent pump station, bar screens and grit collectors, an
anaerobic basin ahead of the existing aeration basins for
biological phosphorus removal, post clarification with alum
addition for chemical trimming of phosphorus removal, deep bed
tertiary filtration with methanol feed for total nitrogen removal,
and additional sludge thickening; digestion and handling facilities
to take care of increased sludge production. The trickling filter

train of the existing plant will be abandoned. New post aeration
and dechlorination facilities will also be provided. Because of
the age of the existing facilities, much of the old infrastructure
must be replaced or refurbished in order to give a full 20 year
life to the facility. No hydraulic capacity expansion is planned.
The stream discharge point will remain at its current location.
F. PLAN 4 - DISCHARGE TO THE YADKIN RIVER:
Because of the greater natural flow in the Yadkin River,
as compared to either Grant Creek or Town Creek, consideration must
be given to discharge of the treated wastewater from both plants to
the Yadkin River. Under this plan, hydraulic modifications will be
made to the Grant Creek Wastewater Treatment Plant and to the Town
Creek Wastewater Treatment Plant, along with construction of other
facilities that will allow treated effluent from both plants to be
discharged to the Yadkin River.
The hydraulic modifications at the Grant Creek Plant
center on utilizing the existing screw pump station to lift treated
wastewater into a new Yadkin River Outfall. By utilizing the
existing screw pump station, a new return sludge pump station will
be needed as will a new influent pump, a second influent force
main, a larger influent Parshall flume and a tie-in between the two
existing grit collectors and the existing influent pump station wet
well.
The hydraulic modifications at the Town Creek Plant will
include new bar screens and grit collectors, a new influent pump
station and force main, and an effluent pump station and force main
to convey treated wastewater to the proposed Yadkin River Outfall.
The 5411/7211 Yadkin River Outfall will carry treated
wastewater from the two plants to a 20 MGD final chlorination,
dechlorination, post aeration facility near the river. After this
final treatment, the treated effluent will be pumped by a new 20
MGD Yadkin River effluent pump station through a 30" force main to
a new diffuser in the Yadkin River. The proposed outfall, final
treatment facilities, effluent pump station and diffuser will be
designed and located such that they will become a part of a larger,
future, single, regional wastewater treatment plant that will then
receive raw wastewater from both the Grant Creek and the Town Creek
basins.
G. PLAN 5A - UPGRADE AND EXPANSION TO GRANT CREEK WASTEWATER
TREATMENT PLANT - GRANT CREEK DISCHARGE:
The N.C. Division of Environmental Management has twice
recommended by letter (See Appendix C) that the City of Salisbury
pursue the discharge into the Yadkin River rather than an expansion
at the Grant Creek WWTP. Therefore, this alternative will not be
considered further.

H. PLAN 5A - UPGRADE AND EXPANSION TO TOWN CREEK WASTEWATER
TREATMENT PLANT - TOWN CREEK DISCHARGE:
The N.C. Division of Environmental Management has twice
recommended by letter (See Appendix C) that the City of Salisbury
pursue the discharge into the Yadkin River rather than an expansion
at the Grant Creek WWTP. Therefore, this alternative will not be
considered further.
I. PLAN 6 - EXPANDED DISCHARGE TO THE YADKIN RIVER:
This plan encompasses the expansion of both plants and
the discharge of the treated effluent to the Yadkin River through
the facilities proposed in Plan 4. The plant expansions will
include nutrient removal. An entire new 2.5 MGD train will be
required at the Grant Creek plant. The Town Creek plant can be
expanded simply through the addition of new secondary clarifiers.
J. PLAN 7 - 20 MGD REGIONAL PLANT AT THE YADKIN RIVER:
Under this plan, the existing plants at Town Creek and
Grant Creek would be abandoned except the influent pump stations
and other primary treatment facilities. The sludge dewatering
facility at the Town Creek plant would be moved to the Grant Creek
WWTP site, as well. The Yadkin River Outfall would carry raw
wastewater from the Grant Creek and the Town Creek basins to the
new plant. Discharge will be through the Yadkin River Diffuser as
planned in Alternative 4.
V. COST ANALYSES•
A. INTRODUCTION:
Cost estimates for the previously identified wastewater
treatment plant alternatives will be presented below. Alternatives
3 and 4 will be compared as well as Alternatives 6 and 7. The Do -
Nothing alternate and the Optimal Performance Plan were found not
to be feasible. The N.C. Division of Environmental Management has
recommended that the City concentrate on alternatives which
encompass discharge to the Yadkin River rather than expansion of
the existing plants. Therefore, Alternative 5 will not be
considered in the cost analysis.
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B. ALTERNATIVE 3 COST ESTIMATE:
TABLE V-1
ALTERNATIVE 3A COST ESTIMATE
MODIFICATIONS TO GRANT CREEK WWTP
NO PLANT CAPACITY INCREASE
Post Clarification $1,300,000
Alum Addition 126,000
Deep Bed Tertiary Filters 4,000,000
Methanol Feed 400,000
Sludge Facilities 2,600,000
Dechlorination 150,000
Post Aeration 370,000
Yard Piping and Repumping 1,061,500
Electrical 750,000
Total Construction Cost $9,696,000
Contingency 969,600
Engineering Design 475,000
Legal, Fiscal, Administrative 77,600
Inspection 216,000
Total Project Cost $11,434,200
TABLE V-2
ALTERNATIVE 3B COST ESTIMATE
MODIFICATIONS TO TOWN CREEK WWTP
NO PLANT CAPACITY -INCREASE
Influent Pump Station
$ 772,200
New Bar Screens and Grit Collector
350,000
Anaerobic Basin
1,400,000
Post Clarification
1,270,000
Alum Addition
126,000
Deep'Bed Tertiary Filters
3,000,000
Methanol Feed
400,000
Sludge Thickening, Digestion, Dewatering
700,000
Post Aeration
370,000
Dechlorination
150,000
Yard Piping
1,152,600
Electrical
700,000
Total Construction Cost $10,290,800
Contingency 1,039,100
Engineering Design 509,200
Legal, Fiscal, Administration 83,100
Inspection 246,000
Total Project Cost $12,268,200

TABLE V-3
ALTERNATIVE 3 TOTAL COST ESTIMATE
MODIFICATIONS TO BOTH PLANTS
Construction Cost $20,086,800
Contingency 2,008,700
Engineering Design 984,200
Legal, Fiscal, Administration 160,700
Inspection 462,000
Total Project Cost $23,702,400
C. ALTERNATIVE 4 COST ESTIMATE:
TABLE V-4
ALTERNATIVE 4 COST ESTIMATE -
DISCHARGE TO YADRIN RIVER
RAS Pump Station, Grant Creek WWTP
Bar Screens, Grit Collectors, Town Creek WWTP
Influent Pump Station, Town Creek WWTP
Effluent Pump Station and Force Main, Town Creek WWTP
Yadkin River Outfall
Chlorination, Dechlorination, Post Aeration
Yadkin River Effluent Pump Station
Yadkin River Diffuser
Total Construction Cost
Contingency
Engineering Design
Legal, Fiscal, Administration
Inspection
Easements and Land
Total Project Cost
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$ 900,000
500,000
772,220
1,362,300
1,513,000
1,538,000
600,000
350,000
$7,535,520
753,550
768,280
60,280
558,900
120,000
$9,796,530

E. ALTERNATIVE 6 COST ESTIMATE:
TABLE V-8
ALTERNATIVE 6 COST ESTIMATE
EXPANDED DISCHARGE TO YADKIN RIVER
RAS Pump Station, Grant Creek WWTP
2.5 MGD Expansion, Grant Creek WWTP
Bar Screens, Grit Collectors, Town Creek WWTP
Influent Pump Station, Town Creek WWTP
Effluent Pump Station and Force Main, Town
New Secondary Clarifiers, Town Creek WWTP
Yard Piping Changes, Town Creek WWTP
Electrical, Town Creek WWTP
Yadkin River Outfall
Chlorination, Dechlorination, Post Aeration
Yadkin River Effluent Pump Station
Yadkin River Diffuser
Increased Sludge Handling Facilities
Replace/Refurbish Existing Infrastructure
Post Clarification, Both Plants
Alum Addition, Both Plants
Deep Bed Tertiary Filters, Both Plants
Methanol Feed, Both Plants
Total Construction Cost
Contingency
Engineering Design
Legal, Fiscal, Administration
Inspection
Land
Total Project Cost
- 13 -
Creek WWTP
$ 900,000
4,250,000
500,000
772,200
1,362,300
750,000
101,300
112,500
1,513,000
1,538,000
600,000
350,000
1,000,000
12,500,000
2,600,000
252,000
8,500,000
800,000
$38,401,300
3,840,100
2,325,200
307,200
1;024,600
250,000
$46,148,400

E. ALTERNATIVE 7 COST ESTIMATE:
TABLE V-9
ALTERNATIVE 7 COST ESTIMATE
20 MGD YADRIN RIVER REGIONAL PLANT
Bar Screens, Grit Collectors, Town Creek WWTP $ 900,000
Effluent Pump Station and Force Main, Town Creek WWTP 1,362,000
Yadkin River Outfall 1,513,000
20 MGD Oxidation Ditch Regional Plant 32,000,000
Chlorination, Dechlorination Post Aeration 1,538,000
Yadkin River Effluent Pump Station 600,000
Yadkin River Diffuser 350,000
Total Project Cost
$38,263,000
Contingency
3,826,300
Engineering Design
2,316,800
Legal, Fiscal, Administration
306,100
Inspection
1,020,900
Land
450,000
Total Project Cost
$46,183,100
VI. RECOMMENDATIONS:
The project as presented herein involves the construction of
facilities to discharge the treated effluent from both of
Salisbury's wastewater treatment plants into the Yadkin River.
Because of the considerably higher flow in the Yadkin River,
discharge limits will be less stringent requiring less construction
at this time compared to the construction required to upgrade the
two (2) existing plants to allow continued discharge into.Grant-and
Town Creeks. As calculated in a previous section of this report,
both of the existing plants will be close to their hydraulic
capacity at the end of the 20-year planning period. However, it is
expected, based on continuous discussions with NCDEM, that nutrient
limits will be imposed on the discharges to Town and Grant Creek
when basin -wide permits are issued in 1998. This act will trigger
the construction of nutrient treatment facilities at the two
existing plants or the construction of a new single plant that will
handle the wastewater from both basins. The NCDEM has strongly
recommended that discharge to the small creeks be discontinued and
that Salisbury look to the Yadkin River as its long term treated
wastewater discharge solution. Therefore, in the least case, the
facilities recommended in Alternative 4 should be built at this
time. The overall financial picture is evident in Alternatives 6
and 7, both of which provide nutrient removal and discharge to the
Yadkin River. The facilities included in Alternative 4 are
included in both Alternatives 6 and 7 and if built at this time as
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recommended, will not have to be built when either of these
alternatives is implemented. The cost comparisons between
Alternatives 6 and 7 are basically equal. However, Alternative
6 relies on chemical processes for nutrient removal that are much
more costly to operate and maintain than the biological process
recommended by Alternative 7. There will be a significantly higher
sludge generation with the Alternative 6 chemical process than with
the biological process. Also, the maintenance of two plants
necessitates increased personnel requirements not required with a
single biological process plant. All of these factors point to the
overwhelming fact that operation and maintenance costs of the
single biological process plant will be considerably less than
those for the dual plant chemical treatment process. Therefore, it
is recommended that Salisbury direct its efforts towards a single
regional plant utilizing biological nutrient removal. At this time,
it is expected that a site adjacent to the Grant Creek WWTP (known
as the Grubbs Ferry Road site) or a site south of Grant Creek
(known as the Sowers Farm site) will be chosen for the regional
plant. If the Sowers Farm site is chosen, an additional pump
station (estimated cost of $2,000,000) will be required to convey
treated water to the Yadkin River Outfall. The Alternative 4 cost
estimates were made using the Grubb Ferry Road site for the
regional plant. A separate environmental assessment of these two
(2) sites has already been completed. It is recommended that the
City of Salisbury proceed with land acquisition now for the
regional plant. Additionally, the City should begin. acquisition of
easements for the Yadkin River Outfall and the acquisition of land
for the proposed chlorination, dechlorination,. disinfection
facilities, for the effluent pump station, and for the river
diffuser structure.
In summary, based on the cost analyses prepared above, it is
recommended that the City proceed with Alternative 4. It includes
all facilities that need to be built at this time and provides for
the future integration of the proposed facilities into the regional
wastewater treatment plant planned for the time when nutrient
limits are imposed.
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