NC0048861_Speculative Limits_20040818

NPDES DOCUMENT !;CANNING COVER SHEET
NPDES Permit:
NC0048861
Creswell WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
Instream Assessment (67b)
Speculative Limits '`)
Environmental Assessment (EA)
Document Date:
August 18, 2004
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content on the resrerse side

Michael F. Easley, Govemor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E. Director
Division of Water Quality
August 18, 2004
The Honorable W.J. White, Mayor
Town of Creswell
P.O. Box 68
Creswell, North Carolina 27928
Subject: Speculative Effluent Limits
Town of Creswell WWTP
NPDES Permit #NC0048861
Washington County
Dear Mayor White:
This letter is in response to your request for speculative effluent limits for proposed expansions to 0.25
and 0.35 MGD at the Town's wastewater treatment plant.
Receiving Stream. This facility discharges to the Scuppernong River, classified C-swamp waters in the
Pasquotank River Basin. The Scuppernong River is listed on North Carolina's 303(d) list as impaired
due to low dissolved oxygen.
Speculative Limits. The Scuppernong River is influenced by tides at the location of Creswell's WWTP
discharge. As such, water quality modeling is difficult at best. Existing limitations are based on the
secondary treatment requirements for lagoon systems. Because of the impaired nature of the receiving
stream, speculative limits are based on treatment levels the Division currently considers Best Available
Technology for facilities discharging less than 1.0 MGD. Speculative limits for expansion to 0.25 MGD
and 0.35 MGD are summarized in table 1 below.
TABLE 1. Speculative Limits for Creswell WWTP © 0.25 and 0.35 MGD Permitted Flow
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Flow
0.25 and 0.35 MGD
BOD5, Summer
5.0 mg/1
7.5 mg/1
TSS
30.0 mg/1
45.0 mg/1
NH3 as N, Summer
2.0 mg/1
6.0 mg/1
NH3 as N, Winter
4.0 mg/1
12.0 mg/1
TRC
17 gg/1
Fecal coliform
200/100 ml
400/100 ml
Engineering Alternatives Analysis (EAA). Please note that the Division cannot guarantee that an
NPDES permit modification for expansion will be issued with these speculative limits. Final decisions
can only be made after the Division receives and evaluates a formal permit application for the Town's
proposed discharge. In accordance with the North Carolina General Statutes, the practicable
wastewater treatment and disposal alternative with the least adverse impact on the environment is
required to be implemented. Therefore, as a component of all NPDES permit applications for new or
expanding flow, a detailed engineering alternatives analysis (EAA) must be prepared. The EAA must
justify requested flows, and provide an analysis of potential wastewater treatment alternatives.
Alternatives to a surface water discharge, such as spray/drip irrigation, wastewater reuse, or
inflow/infiltration reduction, are considered to be environmentally preferable. A copy of the EAA
requirements is attached to this letter.
Nor Carolina
atura!!i
North Carolina Division of Water Quality 1617 Mail Service Center Raleigh, NC 27699-1617 Phone [phone] Customer Service
Internet: h2o.enr.state.nc.us 512 N. Salisbury St. --Raleigh, NC 27604 FAX [phone]
An Equal Opportunity/Affirmative Action Employer — 50% Recycled/10% Post Consumer Paper
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Mayor White
Town of Creswell
8/18/2004
Permit applications for new or expanding flow will be returned as incomplete if all EAA
requirements are not adequately addressed. If you have any questions regarding these
requirements, please contact the DWQ NPDES Unit at 919-733-5083.
State Environmental Policy Act (SEPA) EA/EIS Requirements. A SEPA EA/EIS document must be
prepared for all projects that 1) need a permit; 2) use public money or affect public lands; and 3) might
have a potential to significantly impact the environment. For new wastewater discharges, significant
impact is defined as a proposed discharge of >500,000 gpd and producing an instream waste
concentration of > 33% based on summer 7Q10 flow conditions. For existing discharges, significant
impact is defined as an expansion of > 500,000 gpd additional flow. The proposal for which these
speculative limits is being provided does not appear to be subject to SEPA requirements. However, it is
recommended that SEPA applicability be verified with Mr. Alex Marks, DWQ Planning Branch, (919)
733-5083, ext. 555.
Should you have any questions about these speculative limits or NPDES permitting requirements,
please feel free to contact me at [phone], extension 508.
Sincerely,
Mark McIntire, P.E.
Acting Supervisor, Eastern NPDES Unit
Attachment: EAA Guidance Document
cc: Mr. Gary Hartong, P.E., The Wooten Company, 120 North Boylan Ave., Raleigh, NC 27603-1423
Washington Regional Office
Central Files
NPDES Permit File, NC0048861

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THE
WOOTEN
COMPANY
ENGINEERING
PLANNING
ARCHITECTURE
120 North Boylan Avenue
Raleigh NC 27603-1423
919.828.0531
fax [phone]
July 14, 2004
Mr. Dave Goodrich, Supervisor
North Carolina Department of Environme t andNatoral -Resources,
Division of Water Quality
NPDES Permitting Unit
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
RE: Speculative Limits Request
Town of Creswell WWTP
ff
NPDES Permit No. NC0048861 t DENR -WATER QUALITYPOINi SOURCE BRANCH
TWC No. 2876-B ''� _ _
Dear Mr. Goodrich:
On behalf of the Town of Creswell, this letter is to request speculative limits for an
expansion of the Creswell Wastewater Treatment Plant. While the plant is currently
operating within permitted flow limits, the addition of Tyrrell County Water and
Sewer Districts 1 and 2 will immediately add another 320 residential and commercial
connections to the system which will exceed the current permitted capacity. In
addition, with the recent construction of the 4H Environmental Center and the 4-
laning of US Highway 64, further residential and commercial growth is expected
within Town as well as in portions of Washington County.
We hereby request speculative limits for both a 0.250 mgd and 0.350 mgd expansion
of the plant. The two flow expansion increments will allow us to consider phased
implementation of expansion and to determine service area boundaries.
If you should have any questions concerning this request, please contact our office.
We appreciate your consideration of this request and look forward to your prompt
response.
Sincerely,
THE WOOTE C MPANY
arto ,
/7
Gafy D. H P.E.
cc: W.J. White, Mayor, Town of Creswell
J.D. Brickhouse, Manager, Tyrrell County
JUL 19 2094

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