NC0020648_Speculative Limits_20000410

NPDES DOCIMENT !;CANNING COVER SHEET
NPDES Permit:
NC0020648
Washington WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
Staff Report
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
April 10, 2000
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V.
State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
BM Holman, Secretary
Kerr T. Stevens, Director
Mr. Jerry Cutler
Water Resources Superintendent
City of Washington
P.O. Box 1988
Washington, NC 27889-1988
ATTFA
t_2./fAL.a
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
April 10, 2000
Subject: Speculative Limits for Washington WWTP
NPDES Permit NC0020648
Beaufort County
Dear Mr. Cutler:
This letter is in response to a request from your consultant Thomas Howell, III, P.E. of Rivers &
Associates, Inc. for speculative effluent limits for a proposed expansion from 3.2 MGD to 3.65 MGD
and 4.6 MGD. We have reviewed the request and provide the following response with the enclosed
speculative limits.
The speculative limits presented here are based on our understanding of the proposal and of present
environmental conditions. The Division of Water Quality (DWQ) cannot guarantee that it will issue the
Town an NPDES permit to expand its discharge of treated wastewater into waters of the State. Nor can
we guarantee that the effluent limitations and other requirements included in any permit will be
exactly as presented here. Final decisions on these matters will be made only after the Division
evaluates a formal permit application for the Town's discharge and notices the proposal for public
comment.
Environmental Assessments of New Projects and Expansions
Please be aware that you will have to evaluate this project for environmental impacts before applying
for a permit modification. Anyone proposing to construct new or expanded waste treatment facilities
using public funds or public (state) lands must first prepare an environmental assessment (EA) when
wastewater flows (1) equal or exceed 0.5 MGD or (2) exceed one-third of the 7Q10 flow of the receiving
stream. DWQ will not accept a permit application for a project requiring an environmental assessment
until the Division has approved the EA and sent a Finding of No Significant Impact (FONSI) to the
state Clearinghouse for review and comment.
1617 MAIL SERVICE CENTER, RALEIGH, NORTH CAROLINA 27699-1617 - TELEPHONE [phone]/FAX [phone]
AN EQUAL OPPORTUNITY AFFIRMATIVE ACTION EMPLOYER - 50% RECYCLED/ 1 0% POST -CONSUMER PAPER
VISIT US ON THE INTERNET @ http://h2o.enr.state.nc.us/NPDES

It‘
Mr. Jerry Cutler
Town of Washington
Page 2 of 3
Based on the available information, tentative limits for the proposed discharge of 3.65 MGD and 4.60
MGD flow to the Tar River are presented below. At this time the Division does not anticipate any
significant changes to the Town's existing 3.2 MGD permit upon renewal.
Effluent Limits for 3.65 MGD
Flow (MGD) 3.65
BOD5 (mg/L) 13.1
NH3-N (mg/L) 3.5
TSS (mg/L) 30
Dissolved Oxygen (mg/L) 5.0
Fecal Coliform (#/ 100 mL) 200
pH (S.U.) 6.0 - 9.0
Total Residual Chlorine(ug/L) 28.0
Acute Toxicity Pass/Fail @ 90% with Pimephales promelas
Effluent Limits for 4.60 MGD
Flow (MGD) 4.60
BOD5 (mg/L) 10.4
NH3-N (mg/L) 2.8
TSS (mg/L) 30
Dissolved Oxygen (mg/L) 5.0
Fecal Coliform (#/ 100 mL) 200
pH (S.U.) 6.0 - 9.0
Total Residual Chlorine(ug/L) 28.0
Acute Toxicity Pass/Fail @ 90% with Pimephales promelas
Flow Limits. The flow will be limited to 3.65 and 4.60 MGD as requested by the consultant. This limit
will be applied as a monthly average.
BOD5 and NH3-N. Limits for these oxygen consuming wastes are based on maintaining existing
permitted mass load.
TSS. The limits for total suspended solids are standard for secondary treatment of municipal
wastewater.
Fecal Coliform, pH. The limits for fecal coliform bacteria and pH are derived to protect water quality in
the receiving stream and remain the same as the existing permit.
Chlorine. The Division requires chlorine limits and dechlorination for all new or expanding
dischargers proposing the use of chlorine for disinfection. The process of chlorination/dechlorination,
or an alternate form of disinfection such as ultraviolet radiation, should allow the facility to comply
with the total residual chlorine limit.

Mr. Jerry Culler
"Town of Washington
Pate 3 or 3
Acute Toxicity Testing. Acute pass/fail toxicity testing at 90% with Pimephales promelas will remain a
condition of the NPDES permit for waste flows of both 3.65 and 4.60 MGD. Quarterly monitoring will
be required. We will perform a complete evaluation of limits and monitoring requirements for metals
and other toxicants when we review the City's formal permit application.
Total Phosphorus, Total Nitrogen. Speculative limits on total phosphorus and total nitrogen have not
been included at this line because the Town is participating in the nonpoint source trading option
outlined in the Tar Pamlico NSW Implementation Strategy. If compliance with any element of this
strategy, or subsequent approved revisions to the strategy, is not maintained, the Division reserves the
right to include nutrient limits in any NPDES permit issued to the Town.
I trust this response offers sufficient guidance for the Town's treatment plant expansion. If you have
any additional questions about these limits, feel free to contact Andy McDaniel at [phone],
extension 513.
cc:
Sincerely.
,/
David A. Goodrich, Supervisor
NPDES Unit
Water Quality Section
Thomas Howell, III, P.E. / Rivers & Associates, Inc.
Washington Regional Office/ Jim Mulligan
Aquatic Toxicology Unit
Central Files
NPDES Unit Files}

Rivers
��s ociateE,
III
Mr. Charles H. Weaver, Jr.
NCDENR, DWQ
1617 Mail Service Center
Raleigh, N. C. 27699-1617
January 18, 2000
SUBJECT: Washington, N. C. WWTP
Permit No. NC002648
Rivers File 98121.2 D
Dear Mr. Weaver:
DENR - WATER QUALITY
POINT SOURCE BRANCH
ngineers
lanners
urveyors
As stated in our letter of May 12, 1999, we are updating the "Wastewater Facilities 201 Plan" for
the City of Washington and designing a wastewater treatment plant upgrade. The current
permitted flow is 3.2 mgd. The proposed Phase I Improvements flow would be 3.65 mgd in 2-5
years. The proposed Phase II improvement flow would be 4.50 mgd in 5-10 years.
We would appreciate you providing us with the Speculative Limits for the Washington WWTP
when the new permit is issued at the flow of 3.20 mgd and also if there would be any changes in
the limits at flows of 3.65 mgd and 4.60 mgd. We can then take these limits into account during
the study and design of the wastewater treatment plant upgrade. It may be desirable to have these
limits included in the new permit.
Please call us if you or any of your staff have any questions preparing this information.
Very truly yours,
homas C. Howell, III, P.E.
Vice President
TCH/ju
cc: Russell Waters
Jerry Cutler
File
P:\Muni\Wash\W WTP\Carr\DltWea011800.doc
107 East Second Street, Greenville, NC 27858 • Post Office Box 929 • Greenville, NC 27835 • [phone] • FAX [phone]
E-mail: [e-mail]

JAN-18-2000 TUE 01:54 PM RIVERS & ASSOCIATES FAX NO. 2527523974 P. 01
Rivers
��sso►ciates,
Mr. Charles H. Weaver, Jr.
NCDENR, DWQ
1617 Mail Service Center
Raleigh, N. C. 27699-1617
,AFtv
-� APR' gel
January 18, 2000
SUBJECT: Washington, N. C. WWTP
Permit No. NC002648
Rivers File 98121,2 D
Dear Mr. Weaver:
Engineers
Planners
Surveyors
As stated in our letter of May 12, 1999, we are updating the "Wastewater Facilities 201 Plan" for
the City of Washington and designing a wastewater treatment plant upgrade. The current
permitted flow is 3.2 mgd. The proposed Phase I Improvements flow would be 3.65 mgd in 2-5
years. The proposed Phase II improvement flow would be 4.50 mgd in 5-10 years.
We would appreciate you providing us with the Speculative Limits for the Washington WWT?
when the new permit is issued at the flow of 3.20 mgd and also if there would be any changes in
the limits at flows of 3.65 mgd and 4.60 mgd. We can then take these limits into account during
the study and design of the wastewater treatment plant upgrade. It may be desirable to have these
limits included in the new permit.
Please call us if you or any of your staff have any questions preparing this information,
Very truly yours,
homas C. HowwelI, III,
Vice President
TCH/ju
cc: Russell Waters
Jerry Cutler
File
PAmunlwashlvvverr\corrmwc,t011$Do.doc
107 East Second Street, Greenville, NG 27336 • Pnsr office riox 939 a Greertvillo, NC.. 27S:15 • (752)7e2.4135. 1r (252)753 g7.1
F-�i�t►ll: rivers@rivers:anrlrlh.snnintruA (An,

JAN-18-2000 TUE 01:55 PM RIVERS & ASSOCIATES FAX N0, 2527523974
P. 02
Riders
r&Asociates�s,
/1\
Ms. Colleen Sullins, Chief
Water Quality Section
NCDEM
P. 0, Box 29535
Raleigh, N. C. 27626-0535
May 12, 1999
SUBJTCT: Washington, N. C. WWTP
Permit No. NC002648
Rivers pile 98121
Dear Ms. Sullins:
Engineers
['humors
ittrveynr i
We are updating the "Wastewater Facilities 201 Plan" for the City of Washington in preparation
for design of A wastewater treatment plant upgrade. We weal ,1ti appreciate you providing us with
the ansallativoldniits for the Washington WWTP when the new permit is issued. We can then
take these limits into account during the study and design of the wastewater treatment plant
upgrade.
Please call us if you or any of your staff have any questions preparing this information.
Very truly yours,
homas C, Howell, III, P.E,
Vice President
TCH/ju
ec: Russell Waters
Jerry Cutler
Pile
P:1Mwnilw.hlC:meguAsu los.d.
107 East Second Strout • Post CtVeo Box 920 • Greenville, Ngrth Carolina 278.35 • (252)752-4].35 • FAX (a5»)752.39741
E-mail: [e-mail]