NC0086941_Speculative Limits_20100212

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NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins
Governor Director
February 12, 2010
Mr. F. Tyndall Lewis, P.E.
McDavid Associates, Inc.
P.O. Box 1776
Goldsboro, North Carolina 27533
Dee Freeman
Secretary
Subject: Speculative Limits for Expansion of Southeastern Wayne Sanitary District WTP
NPDES Permit NC0086941
Wayne County
Dear Mr. Lewis:
Pursuant to the SEPA Program, you requested speculative limits on behalf of the Southeastern
Wayne Sanitary District (SEWSD) in Wayne County for an expansion of its WTP facility. The requested
wastewater increase is to 66,000 gpd with no changes to the existing wastewater quality or to the
approved discharge location into Horsepen Branch. The known facility expansion features that impact the
NPDES permit are:
1) Three new iron sand filters, equal in capacity and design to the existing three iron sand filters,
2) ammonia addition at the wells for chloramines disinfection,
3) new controls.
We have reviewed the request and provide the following response. 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 SEWSD a NPDES permit to discharge
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 this discharge, and notices
the proposal for public comment.
Environmental Assessments of New Projects and Expansions
As a reminder 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. Please contact the Division's State Environmental Policy
Act (SEPA) coordinator, currently Hannah Stallings, at [phone] if you have any questions regarding
the SEPA process.
Page 1 of 2
1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604
Phone: [phone] FAX: [phone] Customer Service:1-877-623-6748
Internet http: / / h2o.enr.state.nc.us / •
An Equal opportunity 1 Aff rrnalive Action Employer
No�rthCarolina
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Engineering Alternatives Analysis (EAA)
In accordance with the North Carolina General Statutes, the most practicable wastewater treatment
and disposal alternative with the least adverse impact on the environment is required to be implemented
with any new discharge. 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 a spray/drip irrigation, wastewater reuse, or connection to a regional WWTP are
considered to be environmentally preferable.
Speculative Effluent Limits
We have reviewed information provided by you and existing environmental conditions at the
existing discharge point. Based on the available information, tentative limits for the proposed discharge
are outlined below in Table 1:
Table 1: Speculative Effluent Limits
EFFLUENT CHARACTERISTICS
LIMITS
Monthly Avera a
Dady Maximum
Total Suspended Solids (TSS)
30.0 m /L
1 45.0 m /L
p H
Not greater than 9.0 S.U. nor less
than 6.0 S.U.
Total Residual Chlorine (TRC)
1 17 /L
If you have any questions contact Ron Berry at [phone] or by email [e-mail].
Sincerely,
r �
Ron Berry
Eastern NPDES Program
Attachments:
cc: Washington Regional Office/Surface Water protection/AI Hodge (email)
DWQ Planning Section/Hannah Stallings (email)
Central File
NPDES File (with letter)
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1617 Mail Service Center, Raleigh, North Carolina 27699-1617
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604
Phone: [phone] FAX: 91M07-64951 Customer Service: 1-877-623-6748
Internet hto: / / h2o.enr.state.mmus /
An Equal Opportunity 1 Affirmative Action Employer
NorthCarolina
Naturallrff

INC.
McDAVID ASSOCIATES' INC.
Engineers • Planners -Land Surveyors
CORPORATE OFFICE
[phone] • Fax [phone]
E-mail: mai@mcdawd-incwm
3714 N. Main Street • P.O. Drawer 49
Farmville, NC 27828
January 18, 2010
Mr. Gil Vinzani, P.E.
Supervisor, Eastern NPDES Unit
Division of Water Quality
1617 Mail Service Center
Raleigh, NC 27699-1617
GOLDSBORO OFFICE
[phone] • Fax [phone]
E-mail: [e-mail]
109 E. Walnut Stmt • P.O. Bot 1776
Goldsboro, NC 27533
SUBJECT: Request for Speculative Limits L_
Water Treatment Plant Expansion
NPDES Permit NC 0086941
Southeastern Wayne Sanitary District
Wayne County, NC
Dear Mr. Vinzani:
JAN 202010
Southeastern Wayne Sanitary District (SEWSD) operates a potable drinking water system in
southeastern Wayne County that serves approximately 5,000 users. A portion of its water is treated
(iron and manganese removal) via filtration at an existing .9 MGD water treatment plant (WTP) on
Arrington Bridge Road. Although the backwash from the filters is typically treated and re -used,
SEWSD maintains NPDES Permit NC 0086941 which allows the discharge of its treated backwash
water to Horsepen Branch. The NPDES Permit includes limits for suspended solids, settleable
solids, turbidity and residual chlorine. The NPDES Permit does not limit FLOW.
SEWSD is planning to increase the size of its existing WTP from .9 MGD to 1.62 MGD in
order to replace capacity loss due to Capacity Use Area rules which mandate reductions in
withdrawals from other existing wells. The quantity of wastewater will increase from 33,000 gpd
to 66,000 gpd as a result of the WTP expansion. Treatment facilities at the existing WTP will be
duplicated during the proposed expansion. No change in the quality of treated effluent is
anticipated.
SEWSD has not discharged to Horsepen Branch in recent years. In lieu of discharging, treated
wastewater is recycled through the treatment process and processed into potable water. SEWSD
maintains its NPDES Permit as a safety measure in case discharge becomes necessary.
SEWSD is requesting USDA-RD financial assistance for the WTP expansion. Clearinghouse
comments were requested for the project. Hannah Stallings, Basinwide Planning Unit and SEPA
Program, DWQ, provided a comment in response to the Clearinghouse submittal suggesting a
request for speculative limits be submitted as soon as possible. This letter is provided in
accordance with Ms. Stallings' suggestion.
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Please respond at your earliest convenience. If you have any questions, please do not hesitate
to contact me.
Sincerely,
McDAVID ASSOCIATES, INC.
F. Tyndall Lewis, P.E.
Goldsboro Office
FTL:
cc: Rich Moore
Ed Causey, USDA-RD
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