NC0058416_Fact Sheet_20180425

DEQ/DWR
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES PERMIT NCO086918
BACKGROUND
The Eastern Wayne Sanitary District operates an aeration/greensand filter drinking water treatment
facility at its Water Treatment Plant #3 that serves the surrounding community. The potable water
design is 0.9 MGD. Historically all the wastewater has been stored and the decant from the waste
tank is recycled, blended with raw well water, treated again and sent out into the distribution
system instead of discharging wastewater. The NPDES permit is maintained in case there is an
issue regarding recycling the decanted backwash. The plant maintains a pump so it can transfer
wastewater approximately 0.7 miles and discharge to an unnamed tributary to the Neuse River, a
class C; NSW water in the Neuse River Basin in Lenoir County.
Permittee stated in cover letter no changes in treatment since last renewal. A review of DMR data
showed no discharge between April 2013 and November 2017.
PROCESS/TREATMENT
Aerated well water is pre-treated with potassium permanganate and then flows to three parallel
greensand filters (iron removal). The filtered water is further treated with corrosion inhibitor
(polyphosphate), chlorine, fluoride, and ammonia before entering the main drinking water
distribution network. The drinking water network provides the water for backwashing and rinsing
the greensand filters. There is a dechlorination chemical feed system that treats the returned
drinking water prior to use for backwash/rinse of the greensand filters.
The greensand filters backwash/rinse waste stream accumulates in a holding basin where solids
are collected. The wastewater from the holding basin than can either be mixed with the incoming
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Facility Information
Applicant/Facility
Name:
Eastern Wayne Sanitary District/Rockford Church Road WTP
Applicant Address:
P.O. Box 1583, Goldsboro, North Carolina 27533-1583
Facility Address:
301 Rockford Church Road, LaGrange, North Carolina 28551
Permitted Flow:
Not limited per WTP strategy; Design flow 0.03 MGD
Type of Waste:
Backwash/rinse Greensand Filters WTP
Facility/Permit Status:
PC -I /Active; Renewal
County:
Wayne County (outfall in Lenoir County)
Miscellaneous
Receiving Stream:
UT to Neuse River
Stream Classification:
C; NSW
Subbasin:
03-04-05
Index No.
27-(56)
Drainage Area (mi):
< 0.01 (USGS
Streamstat; from
previous renewal
HUC:
0302020201
Summer 7Q10 cfs
0
303(d) Listed? :
No
Winter 7Q10 cfs :
0
Regional Office:
Washington
30Q2 cfs :
0
USGS Quad:
Seven Springs
Average Flow cfs :
10
1 Permit Writer:
Brianna Youn
IWC (%):
100%
1 Date:
4/20/17
BACKGROUND
The Eastern Wayne Sanitary District operates an aeration/greensand filter drinking water treatment
facility at its Water Treatment Plant #3 that serves the surrounding community. The potable water
design is 0.9 MGD. Historically all the wastewater has been stored and the decant from the waste
tank is recycled, blended with raw well water, treated again and sent out into the distribution
system instead of discharging wastewater. The NPDES permit is maintained in case there is an
issue regarding recycling the decanted backwash. The plant maintains a pump so it can transfer
wastewater approximately 0.7 miles and discharge to an unnamed tributary to the Neuse River, a
class C; NSW water in the Neuse River Basin in Lenoir County.
Permittee stated in cover letter no changes in treatment since last renewal. A review of DMR data
showed no discharge between April 2013 and November 2017.
PROCESS/TREATMENT
Aerated well water is pre-treated with potassium permanganate and then flows to three parallel
greensand filters (iron removal). The filtered water is further treated with corrosion inhibitor
(polyphosphate), chlorine, fluoride, and ammonia before entering the main drinking water
distribution network. The drinking water network provides the water for backwashing and rinsing
the greensand filters. There is a dechlorination chemical feed system that treats the returned
drinking water prior to use for backwash/rinse of the greensand filters.
The greensand filters backwash/rinse waste stream accumulates in a holding basin where solids
are collected. The wastewater from the holding basin than can either be mixed with the incoming
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NPDES NCO086918
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raw water or be pumped to the NPDES outfall. As solids build up in the holding tank they are
removed for land application every other year. Discharge has not occurred at the facility in the
previous 4.5 years.
COMPLIANCE
No discharges to the NPDES outfall have occurred between April 2013 and November 2017. No
violations have occurred.
SUMMARY OF PROPOSED CHANGES
• Outfall map updated
• Regulatory citations added
• Parameter codes added to A(1)
• eDMR language added to A(1) and as Section A(2)
• Updated language on Supplement to Permit Cover Sheet per 2012 WTP guidance
• Turbidity changed to 2/month per 2009 WTP strategy
• Fluoride units changed to ug/L from mg/L in A(1)
• Total iron removed as there is no longer a standard and was monitor only in previous
permit in A(1)
• Total hardness monitoring and associated footnotes added in A(1)
• Updated TRC footnote in A(1)
REGIONAL OFFICE COMMENTS (received via email from randy Sipe 1/9/18)
• The cover letter should be revised to state that effluent monitoring for TN and TP have
also been included in the permit and give justification why.
o DWR response: TN and TP were present in the previous permit, and not added in
this permit renewal. A technical correction concerning this was sent in a letter
dated August 15, 2013. Therefore, reference to TN and TP will not be included in
the cover letter as no changes were made.
• The cover letter should be revised to state that monitoring for Hardness will be required
both for the effluent and at an upstream location and give justification why.
o DWR Response: The last bullet point of the cover letter states "Quarterly Total
Hardness monitoring has been added in Section A. (1) per the current water
treatment plant strategy." The justification is that it is required as part of the WTP
strategy.
o Randy Sipe response 1/9/18: I still think we need to let the permittee know that
they will need to monitor both the effluent and upstream for hardness. The
current permit did not include in stream sampling and this will be the only
constituent that requires it in the new permit and can easily be missed if they are
not used to collecting it. We should try to help them any we can to be compliant.
o DWR Response: As this draft has already been submitted for public notice, and
this is a minor change in the cover letter, which is not an enforceable part of the
permit, the specification can be made in the cover letter when the final permit is
issued.
• The cover letter references an updated outfall map but no map was included with the
permit.
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o DWR Response: The outfall map is included with the draft permit going to the
permittee. I did not attach it to my previous e-mail as I sent only the original
word files for your review. I apologize. For your review, I have included the
map to this e-mail.
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