NC0086941_Speculative Limits for Expansion_20100212

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NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins Dee Freeman
Governor Director Secretary
February 12, 2010
Mr. F. Tyndall Lewis, P.E.
McDavid Associates, Inc.
P.O. Box 1776
Goldsboro, North Carolina 27533
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.
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Location:512 N.Salisbury St.Raleigh,North Carolina 27604 One
Phone:[phone] FAX:[phone] Customer Service:1-877-623-6748 North Carolina
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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 (EM) 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 Average Daily Maximum
Total Suspended Solids (T55) 30.0 mg/L 45.0 mg/L
pH Not greater than 9.0 S.U. nor less
than 6.0 S.U.
Total Residual Chlorine (TRC) 17 pg/L
If you have any questions contact Ron Berry at [phone] or by email [e-mail].
Sincerely,
Q.411 eerty
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 One
Phone:[phone] FAX:[phone] Customer Service:1-877-623-6748 NorthCarolina
Internet:htlp:!/h2o.enr.state.nc.us I • �atura!!r�
An Equal Opportunity 1 Affirmative Action Employer
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