NC0020354_Issuance of Permit Mod/Renewal_20110801

.A/
Beverly Eaves Perdue
Governor
JA
NC®ENR
North Carolina Department of Environment and Natural Resources
Mr. William G. Terry
Town of Pittsboro
P. O. Box 759
Pittsboro, NC 27312
Dear Mr. Terry:
Town Manager
Division of Water Quality
Coleen H. Sullins Dee Freeman
Director Secretary
MUM --0 2 2011
Subject: Issuance of Permit Modification and Renewal
NPDES Permit No. NCO020354
Town of Pittsboro WWTP
Chatham County
Facility Class III
Division of Water Quality (Division) personnel have reviewed and approved your application for a
major modification and renewal of the subject permit. Accordingly, we are forwarding the attached-
NPDES discharge permit. It is issued pursuant to the requirements of North Carolina General
Statute 143-215.1 and the Memorandum of Agreement between North"Carolina and the U.S.
Environmental Protection Agency dated October 15, 2007.
A public hearing was held on March 29, 2011 to obtain public comments on the draft permit, which
proposed renewing the Outfall 001 discharge of 0.75 to Robeson Creek, and adding a new
discharge of 2.47 MGD to the Haw River via Outfall 002. Approximately 50 people attended, and 21
attendees provided oral comments. The public hearing officer reviewed these comments and the
written comments, and recommended the following changes to the draft permit, which were
incorporated into this final permit:
The facility proposes to treat to reuse standards. Given this proposed treatment, and the
concerns expressed by recreational users of the Haw River near the Highway 64 canoe access,
the Outfall 002 limits for fecal coliform were changed to the reuse water quality standards of 14
per 100 mL as a monthly average and 25 per 100 mL as a weekly average.
Upstream and downstream monitoring of fecal coliform must be performed at Outfall 002 (Haw
Rive r),'regardless of whether or not the Town maintains membership in the Upper Cape Fear
River Basin monitoring coalition. It was also recommended that these sampling data results be
posted on the Town's website as soon as possible. This would provide easy public access to
the data for those who are considering recreational use of the river.
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 1! h2o state nc us i ,
An Equal Gpportunity Affirmative '�cuon Employer
One
Not-thCarotina
Natltrall,ff

r
The only other change to your permit from the draft permit sent to you September 29, 2010 is that
footnote number 9 from Table A. (2) was changed to reflect the correct chronic toxicity test dilution
(5.1 %) for the Haw River outfall.
Please note that Robeson Creek is listed as an impaired waterbody on th orth Carolina
303(d) Impaired Waters List. Outfall 001 contains TP limits to address th oberson reek TMDL.
Likewise, TN and TP limits are included in combined outfall C01 to address n Lake TMDL.
Addressing impaired waters is a high priority with the Division, and instream data will continue to be
evaluated. If there is noncompliance with the permitted effluent limits and stream impairment can be
attributed to your facility, then mitigative measures may be required.
If any parts, measurement frequencies, or sampling requirements contained in this permit are
unacceptable, you have the right to an adjudicatory hearing upon written request within thirty (30)
days after receiving this letter. Your request must take the form of a written petition conforming to
Chapter 150B of the North Carolina General Statutes, and must be filed with the Office of
Administrative Hearings, 6714 Mail Service Center, Raleigh, North Carolina 27699-6714. Unless
such demand is made, this permit remains final and binding.
This permit is not transferable except after notifying the Division of Water Quality. The Division may
modify and re -issue, or revoke this permit. Please note that this permit does not affect your legal
obligation to obtain other permits required by the Division of Water Quality, the Division of Land
Resources, the Coastal Area Management Act, or other federal or local governments.
If you have questions, or if we can be of further assistance, please contact Mr. Gil Vinzani at
[[e-mail]] or call [phone].
S;een
,
. ulli s
Enclosure: NPDES Permit FINAL NCO020354
Cc: US EPA Region IV, Pamala Myers (including fact sheet)"
Raleigh Regional Office, Surface Water Protection Section
Environmental Services Section, Aquatic Toxicology Unit, Susan Meadows'
Hobbs, Upchurch & Associates (Adam Kiker, 300 SW Broad St., Southern Pines, NC 28388)
Haw River Assembly (Elaine Chiosso, P.O. Box 187; Bynum, NC 27228)
Construction Grants and Loans Section, Dan Blaisdell*
NPDES Unit Files
Central Files.. .
"E-mail Copy
s.

NPDES Permit No. NCO020354
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provisions of North Carolina General Statute 143-215.1, other lawful standards
and regulations promulgated and adopted by the North Carolina Environmental Management
Commission, and the Federal Water Pollution Control Act, as amended, the
Town of Pittsboro
is hereby authorized to discharge wastewater from a facility located at the
Town of Pittsboro WWTP
Off Small Street Extension
Chatham County
to receiving waters designated as Robeson Creek and the Haw River in the Cape Fear River Basin
in accordance with effluent limitations, monitoring requirements, and other conditions set forth in
Parts I, I1, III, and IV hereof.
The permit shall become effective July 1, 2011.
This permit and the authorization to discharge shall expire at midnight on April 30, 2016.
Signed this day 7i
M
Division of Water Quality
By Authority of the Environmental Management Commission
Page 1 of 11

1
NPDES Permit No. NC0020354 '
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby superseded. As
of this permit issuance, any previously issued permit bearing this number is no longer effective. Therefore, the
exclusive authority to operate and discharge from this facility arises under the permit conditions, requirements,
terms, and provisions included herein.
The Town of Pittsboro is hereby authorized to:
1. Continue to' operate an existing 0.75 MGD extended aeration treatment system consisting of the
following components:
• Manual and mechanical bar screen
• Diffused aeration basins
• Clarifiers
• Phosphorous removal
• High -rate sand filters
• Sludge thickening
• Aerobic sludge digestion
• Ultraviolet disinfection
• Effluent flow measurement
• Cascade post aeration
2. After receiving an Authorization to Construct from the Division of Water Quality and
submitting an engineer's certification, operate a 3.22 MGD extended aeration wastewater treatment
system including the following components:
• Grit removal system
• Your anaerobic basins
• Four oxidation ditches with anoxic zones
• Four secondary clarifiers
• Four tertiary denitrification filters
• Sludge storage, thickening, and dewatering
The facility is located at the Pittsboro WWTP off of the Small Street Extension, southeast of
Pittsboro in Chatham County
3. Discharge from said treatment works at'the location specified on the attached map into Robeson
Creek (0.75 MGD, outfall 001), and into the Haw River (2.47 MGD, outfall 002), both classified as
WS-IV NSW waters in the Cape Fear River Basin.
Page 2 of 11

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NCO020354 Town of Pittsboro WWTP
1 . .
Receiving Streams: Outfall 001-Robeson Creek;
Outfall 002-Haw River
Outfall 001 O utfa 11002
Latitude : 35042'48"; 350 3'50
Longitude: 7901014", 79006'23
Quad M E22NW, Pittsboro Sub -Basin: 03-06-04
Stream Class: WS-IV, NSW (both) 8-Digit HUC: 03030002
0 , v , � „
Facility
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3
Town of Pittsboro
Chatham County
', ,

NPDES Permit No. NCO020354 A
A.M) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS — Outfall 001
Beginning upon the effective date of this permit and lasting until expiration, the Permittee is authorized
to discharge treated wastewater from Outfall 001 to Robeson Creek. Such discharges shall be limited
and monitored by the Permittee as- specified below:
-'A -
"*Ze , . '� ;
EFFLUENT:LlM�.e'>�
-1-�1'1;ff
" - vi:� .
, 9NITORING
,
��- -I '
-L-
IOEMENTS J,
`ki
Average,
'Maximum
a
��SampleType,-!
5amplejLocat1orf,..--f,'W'
W" '
Flow
0.75 MGD
Continuous
Recording
Influent or Effluent
Total Monthly Flow (MG)
Monitor & Report
Monthly
Recording or
Influent or Effluent
Calculated
BOD, 5-day, (20°C) 2
(April 1 — October 31
5.0 mg/L
7.5 mg/L
3/Week
Composite
Influent & Effluent
BOD, 5-day, (20°C) 2
(November 1 — March 31)
10.0 mg/L
15.0 mg/L
3/Week
Composite
Influent & Effluent
Total Suspended SolidS2
30.0 mg/L
45.0 mg/L
3/Week
Composite
Influent& Effluent
NH3 as N
2.0 mg/L
6.0 mg/L
3/Week
Composite
Effluent
Total Residual Chlorine 4
17 pg/L
3/Week
Grab
Effluent
pH 5
3/Week
Grab
Effluent
Temperature (OC)
Daily
Grab
Effluent
Temperature (OC)
3/Week
Grab
Upstream & Downstream
Dissolved Oxygen 3
3/Week
Grab
Effluent,
Upstream & Downstream
Fecal Coliform
200/100 mL
400/100 mL
3/Week
Grab
Effluent,
(geometric mean)
Upstream & Downstream
Conductivity
3/Week
Grab
Effluent,
Upstream & Downstream
TKN
Monitor & Report (mg/L)
Weekly
Composite
Effluent
NO3-N + NO2-N
Monitor & Report (mg/L)
Weekly
Composite
Effluent
Total Nitrogen, TN 6
Monitor & Report (mg/L)
Weekly
Composite
Effluent
TN Load 7,1
Monitor & Report (lb/mo)
Monthly
Calculated
Effluent
Monitor & Report (lb/yr)
Annually
Total Phosphorus, TP
Monitor & Report (mg/L)
Weekly
Composite
Effluent
Total Phosphorus, TP 9
2.0 mg/L Quarterly Average
Weekly
Composite
Effluent
TP Load 7,1
Monitor & Report (lb/mo)
Monthly
Calculated
Effluent
322 lb (Apr. 1-Oct. 31)
Seasonally
Total Nickel
25 pg/L
261 pg/L
Weekly
Composite
Effluent
Total Copper
Monthly
Composite
Effluent
Total Zinc
Monthly
Composite
Effluent
Chronic Toxicity 10
Quarterly
composite
Effluent
All footnotes are. 11isted on the following page.
1
Page 3 of 11

NPDES Permit No. NCO020354
Footnotes from Effluent Limitations and Monitoring Requirements (Outfall 001):
1. Sample locations: Upstream = at least 100 yards above the outfall; Downstream = at least 100 yards
downstream from the outfall. Instream monitoring shall be conducted 3/Week during June, July, August,
and September, and once per week during the remainder of the year. Instream monitoring is
provisionally waived in light of the Permittee's participation in the Upper Cape Fear River Basin
Association. Instream monitoring shall be conducted as stated in this permit should the Permittee end its
participation in the Association.
2. The monthly average BOD5 and Total Suspended Residue concentrations shall not exceed 15% of the
respective influent value (85% removal).
3. The daily dissolved oxygen effluent concentration shall not be less than 6.0 mg/1.
4. Total Residual Chlorine limit applies if chlorine or chlorine derivative is used for disinfection. The
Division shall consider all effluent TRC values reported below 50 µg/l to be in compliance with this
permit. The Permittee shall continue to record and submit all values reported by a North Carolina
certified laboratory even if these values fall below 50 µg/l.
5. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
6. TN = TKN + NOs-N + NO2-N, where TN is Total Nitrogen, TKN is Total Kjeldahl Nitrogen, and NO3-N
and NO2-N are Nitrate and Nitrite Nitrogen, respectively.
7. TN or TP Load is the mass quantity of Total Nitrogen or Phosphorus discharged in a given period of time.
See Condition A. (6.).
8. Compliance with mass limits shall be determined in accordance with Conditions A.(4.) and A.(5.).
9. The quarterly average for total phosphorus shall be the average of composite samples collected weekly
during each calendar quarter (January -March, April -June, July -September, October -December).
10. Chronic Toxicity (Ceriodaphnia) P/F at 90%; March, June, September & December. See Condition A.(7.).
There shall be no discharge of floating solids or foam.
Page 4 of 11

NPDES Permit No. NCO020354
A.(2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS - Outfall 002
Beginning upon the effective date of this permit and lasting until expiration, the Permittee is authorized
to discharge treated wastewater from Outfall 002 to the Haw River. Such discharges shall be limited
and monitored by the Permittee as specified below:
EFFLUENT
CHARACTERISTICS
EFFLUENT LIMITATIONS
MONITORING REQUIREMENTS
Monthly
Average
Weekly
Average
Daily
• Maximum
Measurement
Frequency
Sample Type
Sample Location'
Flow (MGD)
2.47 MGD
Continuous
Recording
Influent or Effluent
Total Monthly Flow (MG)
Monitor & Report
Monthly
Recording or Calculated
Influent or Effluent
BOD, 5-day, (20°C) 2
April 1 — October 31)
5.0 mg/L
7.5 mg/L
Daily
Composite
Influent & Effluent
BOD, 5-day, (20°C) 2
November 1 — March 31
10.0 mg/L
15.0 mg/L
Daily
Composite
Influent & Effluent
Total Suspended Solids2
30.0 mg/L
45.0 mg/L
Daily
Composite
Influent & Effluent
NH3 as N
(April 1 — October 31)
1.0 mg/L
3.0 mg/L
3/Week
Composite
Effluent
NH3 as N
November 1 — March 31
2.0 mg/L
6.0 mg/L
3/Week.
Composite
Effluent
Total Residual Chlorine
28 ug/L
3/Week
Grab
Effluent
pH 5
Daily
Grab
Effluent
Temperature (IC)
Daily
Grab
Effluent
Temperature (°C)
3/Week
Grab
Upstream & Downstream
Dissolved Oxygen
3/Week
Grab
Effluent,
U stream & Downstream
Fecal Coliform
eometric mean
14/100 mL
25/100 mL
Daily
Grab
Effluent,
Upstream & Downstream
Conductivity
3/Week
Grab
Effluent,
Upstream & Downstream
TKN
Monitor & Report (mg/L)
Weekly
Composite
Effluent
NO3-N + NO2-N
Monitor & Report (mg/L)
Weekly
Composite
Effluent
Total Nitrogen, TN
Monitor & Report (mg/L)
Weekly
Composite.
Effluent
TN Load 7,11
Monitor & Report (lb/mo)
Monitor & Report (lb/yr)
Monthly
Annually
Calculated
Effluent
Total Phosphorus, TP
Monitor & Report (mg/L)
Weekly
Composite
Effluent
TP Load 7,11
Monitor & Report (Ib/mo)
Monitor & Report (lb/yr)
Monthly
Annually
Calculated
Effluent
Total Nickel
Monthly
Composite
Effluent
Total Copper
Monthly
Composite
Effluent
Total Zinc
Monthly
Composite
Effluent
Chronic Toxicity 9 '
Quarterly
Composite
Effluent
All Ifootnotes are listed on the following page.
u
;. —
Page 5 of 11

NPDES Permit No. NCO020354
Footnotes from Effluent Limitations and Monitoring Requirements (Outfall 002):
1. Sample locations: Upstream = at least 100 yards above the outfall; Downstream = at least 100 yards
downstream from the outfall. Instream monitoring shall be conducted 3/Week during June, July, August,
and September, and once per week during the remainder of the year. Instream monitoring is provisionally
waived in light of the Permittee's participation in the Upper Cape Fear River Basin Association. Instream
monitoring shall be conducted as stated in this permit should the Permittee end its participation in the
Association. However, upstream and downstream monitoring for fecal coliform must be performed and
reported regardless of association membership.
2. The monthly average BOD5 and Total Suspended Residue concentrations shall not exceed 15% of the
respective influent value (85% removal).
3. The daily dissolved oxygen effluent concentration shall not be less than 6.0 mg/l.
4. Total Residual Chlorine limit applies if chlorine or chlorine derivative is used for disinfection. The Division
shall consider all effluent TRC values reported below 50 µg/l to be in compliance with this permit. The
Permittee shall continue to record and submit all values reported by a North Carolina certified laboratory
even if these values fall below 50 µg/1.
5. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
6. TN = TKN + NO3-N + NO2-N, where TN is Total Nitrogen, TKN is Total Kjeldahl Nitrogen, and NO3-N and
NO2-N are Nitrate and Nitrite Nitrogen, respectively.
7. TN or TP Load is the mass quantity of Total Nitrogen or Phosphorus discharged in a given period of time. See
Condition A. (6.).
8. Compliance with mass limits shall be determined in accordance with Conditions A.(4.) and A.(5.).
9. Chronic Toxicity (Ceriodaphnia) P/F at 5.1%; March, June, September & December. See Condition A.(7.).
There shall be no discharge of floating solids or foam.
A.M) COMBINED LIMITATIONS — Outfall C01(Combined Outfalls 001 and 002)
During the period beginning on the dates specified below and lasting until permit expiration, the
Permittee is subject to the following combined limitations for discharges from Outfalls 001 and 002 in
addition to any limits specified in Conditions A.(L) and A.(2.) of this permit:
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<2n��iitY �Y ;•t'k�£�'-t )U�1�1T�.t: -
Flow
3.22 MGD
See Conditions A.(1.) and A.(2.)
Combined 001 & 002
TP Delivered Load 2
Monitor and Report
Annually
Calculated
Combined 001 & 002
3,731 Ib/yr
TN Delivered Load 2
Monitor and Report
Annually
Calculated
Combined 001 & 002
27,514 Ib/yr (effective 1/1/2016)
Grab or
Effluent Pollutant Scan
See Condition A. 8.)
(
Annually
Composite
Effluent
Footnotes:
1. Values at Combined Outfall C01 are the sum of the corresponding values at Outfalls 001 and 002.
2. Compliance with the nutrient limits shall be determined in accordance with Conditions A.(5.) and A.(6.)
of this permit.
Page 6 of 11

NPDES Permit No. NCO020354
eI . ,. _ . , r . . . , . . '1 r . . 1 Y
A.(4.) NUTRIENT ALLOCATIONS AND LIMITS
(a.) The Pittsboro WWTP is assigned Total Phosphorus (TP) and Total Nitrogen (TN) allocations
under the following authorities:
(i.) Robeson Creek Total Phosphorus TMDL, approved 1/13/2004.
(ii.) Jordan Lake TMDL, approved 9/20/2007 and incorporated into Jordan Lake Nutrient
Management Strategy - Wastewater Discharge Requirements, T15A NCAC 02B .0270 (the
"wastewater rule").
(b.) The purpose of this condition is to list the allocations assigned to the Permittee and any changes
in the allocations resulting from transfers to or from the Permittee. For compliance purposes,
these allocations do not supersede any TN or TP limit specified elsewhere in this permit or in the
NPDES permit of a compliance association of which the Permittee is a Co-Permittee Member.
(c.) The Robeson Creek TMDL limits the discharge of Total Phosphorus from the Pittsboro WWTP
into Robeson Creek (Outfall 001) to 322 lb TP per summer season (April 1- October 31).
(d.) The Jordan Lake TMDL and wastewater rule limit Total Nitrogen and Total Phosphorus
contributions from point and nonpoint sources into Jordan Lake and its tributaries. The following
table lists the allocations assigned to, acquired by, or transferred to the Permittee in accordance
with the Jordan Lake wastewater rule and the status of each as of permit issuance. For
compliance purposes, this table does not supersede any TN or TP limit established elsewhere in
this permit or in the NPDES permit of a compliance association of which the Permittee is a Co-
Permittee Member.
Total Nitrogen Allocation
.�'Y t}T..,
• -�^`
,ALL' QGATION
�,,,-- ,.+ Vwz:•_-
;=s=::y�,..t':;
_ �AL'LOCATION'Al1A0UNT.--�;�:" �,i�
��..,:��>�a._sc.i�;+M}ir
4..
Delivered (ICi/y)
kmDischarge,(Ib/Yr);,
r..s;•:"
Base
Assigned by Rule
8/11/09
27,514
36,202
Active
(T15A NCAC 02B .0270)
TOTAL
27,514
36,202
Active
Footnote:
(1) Nitrogen Transport Factor = 76% at Robeson Creek (Outfall 001), 99% at Haw River (Outfall 002).
Total Phosphorus Allocation
- .. Fi,
-_ :t• ..�;.' � �•x.1 Kf2A My
_ ."��`���.[l.
� d.`,' r �.�w. - _ :tl''�'.(' •'._
�ALL'OCATION,AMOUNT�
^��. .U't-'„2--�•. - _
AL',LOCATIONi
.<:,.'x,,
-,s;4'r , E .s _.,
SOURCE ::,
:.°
DATE "d
,•r.
z ;;r ,. -
,1;?:`:;'.;,�
STAT•US'
F.
,F`M ';.. •^C"
?itTYPE'
ti. `,.CF jLt{,-
r^ '{.�S
i Di h e lb! r
Delivered'(Ib/yr) sc a 9Y..).:
.-
z<..,
Assigned by Rule
Base
8/11/09
3,731
4,551
Active
(T15A NCAC 02B .0270)
TOTAL
1 3,731
4,551
1Active
• „ Footnote: - ,
(1) Phosphorus Transport Factor = 82% at Robeson Creek (Outfall 001), 99% at Haw River (Outfall 002).
(e.) Any addition, deletion, or modification of the listed allocation(s) (other than to correct
typographical errors) or any change in status of any of the listed allocations shall be considered a
major modification of this permit and shall be subject to the public review process afforded such
modifications under state and federal rules.
Page 7 of 11

NPDES Permit No. NCO020354
A.(5.) ANNUAL NUTRIENT LIMITS — Jordan Lake
(a.) Total Nitrogen (TN) and Total Phosphorus (TP) allocations and load limits established under the
Jordan Lake Nutrient Management Strategy for NPDES wastewater dischargers are annual
values and apply on a calendar year basis. (The provisions of this special condition are limited to
these annual limits and do not apply to seasonal limits established in the Robeson Creek TMDL.)
(b.) For any given calendar year, the Permittee shall be in compliance with the annual TN (or TP)
Load limit in this Permit if:
(i.) the Pem-ittee's annual TN (or TP) Load is less than or equal to the effective limit, or
(ii.) the Permittee is a Co-Permittee Member of a compliance association.
(c.) The TN (or TP) Load limit in this Permit may be modified as the result of allowable changes in
the Permittee's allocations.
(i.) Allowable changes include those resulting from purchase of TN (or TP) allocation from an
authorized mitigation banker, the Ecosystem Enhancement Program, or other source
allowed under applicable regulations; purchase, sale, trade, or lease of allocation between
the Permittee and other dischargers; regionalization; and other transactions approved by
the Division.
(ii.) The Permittee may request a modification of the TN (or TP) Load limit in this Permit to
reflect allowable changes in its allocation(s).
(A) Upon receipt of timely and proper application, the Division will modify the permit as
appropriate and in accordance with state and federal program requirements.
(B) Changes in TN (or TP) limits become effective on January 1 of the year following
permit modification. The Division must receive application no later than August 31
for changes proposed for the following calendar year.
(iii.) Any requests for modification should be sent to:
NCDENR/ DWQ/ NPDES Programs
Attn: Jordan Lake Watershed Coordinator
1617 Mail Service Center
Raleigh, NC 27699=1617
(d.) If the Permittee is a member and co-permittee of an approved compliance association on
January 1 of a given year, its TN and TP discharges during that year are governed by that
association's group NPDES permit and the limits therein.
(i.) The Permittee shall be considered a Co-Permittee Member for any given calendar year in
which it is identified as such in Appendix A of the association's group NPDES permit.
(ii.) Association roster(s) and members' TN and TP allocations will be updated annually and in
accordance with state and federal program requirements.
(iii.) If the Permittee intends to join or leave a compliance association, the Division must be
notified of the proposed action in accordance with the procedures defined in the
association's NPDES permit.
(A) Upon receipt of timely and proper notification, the Division will modify the permit as
appropriate and in accordance with state and federal program requirements.
(B) Membership changes in a compliance association become effective on January 1 of the
year following modification of the association's permit.
(e.) The TN and TP monitoring and reporting requirements in this Permit remain in effect
throughout the term of the Permit and are not affected by the Permittee's membership in a
Page 8 of 11

NPDES Permit No. NCO020354
compliance association.
A.K) CALCULATION AND REPORTING OF NUTRIENT LOADS
The Permittee shall calculate and report monthly and annual nutrient loads as follows:
(a.) Calculation of Discharge Loads (Outfalls 001 and 002): The Permittee shall calculate monthly and
annual discharge loads for each outfall as follows:
(i.) Monthly Discharge Load (lb/mo, TN or TP) = TN (or TP) x TMF x 8.34
where:
TN (or TP) = the average Total Nitrogen (or Total Phosphorus) concentration
(mg/L) of the composite samples collected during the month
TMF = the Total Monthly Flow of wastewater discharged during the
month (MG/mo)
8.34 = conversion factor, from (mg/L x MG) to pounds
--------------------------------------------------------------- --------------------
(ii.) Annual Discharge Load (lb/yr, TN or TP) = Sum of the 12 Monthly TN (or TP) Loads for
the calendar year
(b.) Calculation of Delivered Loads (Outfall C01): The Permittee shall calculate annual delivered
loads as follows:
(i.) Individual Outfalls 001 & 002:
Annual Delivered Load (lb/yr, TN or TP) = Annual Discharge Load (lb/yr) x TF
where TF = Transport Factor for each outfall, as specified in Condition A.(4.),
Nutrient Allocations and Limits.
(ii.) Combined Outfall C01:
Annual Delivered Load (lb/yr, TN or TP) = Sum of the Outfall 001 & 002 Annual Delivered
TN (or TP) Loads for the calendar year
(c.) Reporting of Nutrient Discharges: The Permittee shall report monthly TN and TP discharge
loads for Outfalls 001 and 002 in the appropriate discharge monitoring report.
(d.) Reporting of Combined Delivered Loads: The Permittee shall report each calendar year's
combined delivered loads for Outfall C01 with the December report for that year and shall
append the report with a summary of monthly loads and calculations.
Page 9 of 11

NPDES Permit No. NCO020354
A.M) CHRONIC TOXICITY PERMIT LIMITS (QUARTERLY)
The effluent discharge shall at no time exhibit observable inhibition of reproduction or significant
mortality to Ceriodaphnia dubia at an effluent concentration of 90% at Outfall 001(Robeson Creek) and
5.1% at Outfall 002 (Haw River).
The permit holder shall perform at a minimum, quarterly monitoring using test procedures outlined in
the "North Carolina Ceriodaphnia Chronic Effluent Bioassay Procedure," Revised February 1998, or
subsequent versions or North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure"
(Revised -February 1998) or subsequent versions. The tests will be performed during the months of
March, June, September, and December. Effluent sampling for this testing shall be performed at the
NPDES permitted final effluent discharge below all treatment processes.
If the test procedure, performed as the first test of any single quarter, results in a failure or ChV below
the permit limit, then multiple -concentration testing shall be performed at a minimum, in each of the
two following months, as described in "North Carolina Phase II Chronic Whole Effluent Toxicity Test
Procedure" (Revised -February 1998) or subsequent versions.
The chronic value for multiple concentration tests will be determined using the geometric mean of the
highest concentration having no detectable impairment of reproduction or survival and the lowest
concentration that does have a detectable impairment of reproduction or survival. The definition of
"detectable impairment," collection methods, exposure regimes, and further statistical methods are
specified in the "North Carolina Phase II Chronic Whole Effluent Toxicity Test Procedure" (Revised -
February 1998) or subsequent versions.
All toxicity testing results required as part of this permit condition will be entered on the Effluent
Discharge Monitoring Form (MR-1) for the months in which tests were performed, using the
parameter code TGP3B for the pass/fail results and THP313 for the Chronic Value. Additionally,
DWQ Form AT-3 (original) is to be sent to the following address:
NCDENR/ DWQ/ Environmental Sciences Section
1621 Mail Service Center
Raleigh, North Carolina 27699-1621
Completed Aquatic Toxicity Test Forms shall be filed with the Environmental Sciences Section no later
than 30 days after the end of the reporting period for which the report is made. Test data shall be
complete, accurate, include all supporting chemical/physical measurements and all
concentration/response data, and be certified by laboratory supervisor and ORC or approved
designate signature. Total residual chlorine of the effluent toxicity sample must be measured and
reported if chlorine is employed for disinfection of the waste stream.
Should there be no discharge of flow from the facility during a month in which toxicity monitoring is
required, the permittee will complete the information located at the top of the aquatic toxicity (AT) test
form indicating the facility name, permit number, pipe number, county, and the month/year of the
report with the notation of "No Flow" in the comment area of the form. The report shall be submitted
to the Environmental Sciences Section at the address cited above.
Should the permittee fail to monitor during a month in which toxicity monitoring is required,
monitoring will be required during the following month. Should any test data from this monitoring
requirement or tests performed by the North Carolina Division of Water Quality indicate potential
impacts to the receiving stream, this permit may be re -opened and modified to include alternate
monitoring requirements or limits.
NOTE: Failure to achieve test conditions as specified in the cited document (such as minimum control
organism survival, minimum control organism reproduction, and/or appropriate environmental
controls) shall constitute an invalid test and will require immediate follow-up testing, to be completed
no later than the last day of the month following the month of initial monitoring.
Page 10 of 11

NPDES Permit No. NCO020354
A.(8.) EFFLUENT POLLUTANT SCAN
The Permittee shall perform an annual Effluent Pollutant Scan for all parameters listed in the table
below (in accordance with 40 CFR Part 136). The annual effluent pollutant scan samples shall represent
seasonal (summer, winter, fall, spring) variations over the 5-year permit cycle. Unless otherwise
indicated, metals shall be analyzed as "total recoverable."Additionally, the method detection level and
the minimum level shall be the most sensitive as provided by the appropriate analytical procedure.
Ammonia (as N)
Trans-1,2-dichloroethylene
Bis (2-chloroethyl) ether
Chlorine (total residual, TRC)
1,1-dichloroethylene
Bis (2-chloroisopropyl) ether
Dissolved oxygen
1,2-dichloropropane
Bis (2-ethylhexyl) phthalate
Nitrate/Nitrite
1,3-dichloropropylene
4-bromophenyl phenyl ether
Kjeldahl nitrogen
Ethylbenzene
Butyl benzyl phthalate
Oil and grease
Methyl bromide
2-chloronaphthalene
Phosphorus
Methyl chloride
4-chlorophenyl phenyl ether
Total dissolved solids
Methylene chloride
Chrysene
Hardness
1,1,2,2-tetrachloroethane
Di-n-butyl phthalate
Antimony
Tetrachloroethylene
Di-n-octyl phthalate
Arsenic
Toluene
Dibenzo(a,h)anthracene
Beryllium
1,1,1-trichloroethane
1,2-dichlorobenzene
Cadmium
1,1,2-trichloroethane
1,3-dichlorobenzene
Chromium
Trichloroethylene
1,4-dichlorobenzene
Copper
Vinyl chloride
3,3-dichlorobenzidine
Lead
Acid -extractable compounds:
Diethyl phthalate
Mercury*
P-chloro-m-cresol
Dimethyl phthalate
Nickel
2-chlorophenol
2,4-dinitrotoluene
Selenium
2,4-dichlorophenol
2,6-dinitrotoluene
Silver
2,4-dimethylphenol
1,2-diphenylhydrazine
Thallium
4,6-dinitro-o-cresol
Fluoranthene
Zinc
2,4-dinitrophenol
Fluorene
Cyanide
2-nitrophenol
Hexachlorobenzene
Total phenolic compounds
4-nitrophenol
Hexachlorobutadiene
Volatile organic compounds:
Pentachlorophenol
Hexachlorocyclo-pentadiene
Acrolein
Phenol
Hexachloroethane
Acrylonitfile
2,4,6-trichlorophenol
Indeno(1,2,3-cd)pyrene
Benzene
Base -neutral compounds:
Isophorone
Bromoform
Acenaphthene
Naphthalene
Carbon tetrachloride
Acenaphthylene
Nitrobenzene
Chlorobenzene
Anthracene
N-nitrosodi-n-propylamine
Chlorodibromomethane
Benzidine
N-nitrosodimethylamine
Chloroethane
Benzo(a)anthracene
N-nitrosodiphenylamine
2-chloroethylvinyl ether
Benzo(a)pyrene
Phenanthrene -
Chloroform
3,4 benzofluoranthene
Pyrene
Dichlorobromomethane
Benzo(ghi)perylene
1,2,4-trichlorobenzene
1;1=dichloroethane
Benzo(k)fluoranthene
1,2-dichloroethane
Bis (2-chloroethoxy) methane
Test results shall be reported to the Division in DWQ Form- DMR-PPA1 or in a form approved by the
Director within 90 days of sampling. The report shall be submitted to the following address:
NC DENR/ DWQ/ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617.
*Mercury samples shall be analyzed using EPA, Method 1631E.
, , . . r 1 0 . . v i
Page 11 of 11

NCDENR / DWQ
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
Town of Pittsboro Wastewater Treatment Plant
NPDES No. NCO020354
r fi w: drf'
„.Miscellaneous:lnformatiorit,,`,:�
(1) Facility:
Pittsboro WWTP, off of Small Street Extension
(2) Permitted Flow:
3.22 MGD
(6) County:
Chatham
(3) Facility Class:
IV
(7) Regional Office:
Raleigh
(4) Facility Status:
New
(8) USGS Topo Quad:
E22NW
Pittsboro
(5) Permit Status:
Major Mod. and
(9) Permit Writer:
Gil Vinzani
Renewal
Stream Characteristics
(1) Receiving Stream:
(1): Robeson Creek — 0.75 MGD; (2): Haw River — 2.47 MG
(2) Subbasin:
03-06-04
(7) Summer 7010:
(1) 0.03 cfs
(2) 71.8 cfs
(3) Drainage Area:
(1) 10.5 sq. mi.
(8) Winter 7Q10):
(1) 0.41 cfs
(2) 1275 mil
(2) 125.6 cfs
(4) Streams
WS-IV, NSW
(9) 30Q2:
(1) 0.4 cfs
Classifications:
(both)
(2) 159 cfs
(5) 303(d) Listed:
(1) Yes; (2) No
(10) Average Flow:
(1) 10 cfs
(2) 1240 cfs
(6) 8-Digit HUC:
03030002
(11) IWC:
(1) 100%;
(2) 5.06%
-t-
Summary and Permit History
• The Town of Pittsboro operates an extended aeratioZlake
water treatment plant
that discharges into Robeson Creek; class WS-IV NSape Fear River
Basin. This creek is tributary to Jordan Lake, flowinging one of its
northwest arms. Flows are so low that it may be co rea for
wastewater permitting purposes. Algarblooms have been observed within this arm during
recent years and this reach of the stream has been placed on the state's 303(d) list because
sampling there has shown exceedances of the water quality standard for chlorophyll -a. The
causative pollutant is phosphorous. Therefore, in 2004, the stream was given a Total
Maximum Daily Load (TMDL) for total phosphorous (TP) that must be met during the
summer months (April through October). Because the Town of Pittsboro WWTP is the only
known point source discharger into the creek it is the sole point source contributor of
phosphorous and is liable for the entire point source load reduction established to implement
the TMDL.

NPDES PERMIT FACT SHEET
Town of Pittsboro WWTP
NC0020354 ;
• Since the WWTP as it exists today cannot meet the very stringent Jordan Lake TMDL for TN
and TP, a new treatment facility was proposed. The expanded capacity also addresses the
necessity of serving an increasing population.
• Originally, this application was assigned a new NPDES permit number (NC0088943). After
internal discussion, it was decided to retain the NC0020354 number, for administrative
continuity. This expansion request will therefore be treated as both a major modification and
a renewal. The existing permit expires April 30, 2011.
• The new 3.22 MGD treatment plant will have two outfalls and be located adjacent to the
existing plant. It will be a BNR plant with nutrient removal and tertiary filters. Outfall 001 will
discharge 0.75 MGD to Robeson Creek at the present outfall site; Outfall 002 will discharge
2.47 MGD to the Haw River at the US 64 bridge.
• The Town at present has an inactive pretreatment program. According to the Pretreatment
Unit, there are currently no SIU's.
• In order to achieve the TP TMDL for Robeson Creek, outfall 001 must cap its summer (April
to October) discharge at 0.68 kg/day, or 0.24 mg/L at the design flow of 0.75 MGD.
• An engineering alternative analysis was included as part of the Environmental Impact
Statement. A draft record of decision (ROD) was issued for this EIS on March 19, 2010.
• The section of Robeson Creek downstream of the proposed WWTP is listed as impaired on
the 2010 303(d) list for Biological Criteria. The Haw River site at Outfall 002 is not 303(d)
listed, although it is located above a section of the river that is impaired for chlorophyll -a.
• A new permit modification for NC0020354 was issued on July 9, 2010. This modification
accounted for the Jordan Reservoir Nutrient Management Strategy rules. These rules
established maximum load allocations for nitrogen and phosphorus, which will be continued
for this permit.
DMR Data.
• Flow: According to the application, the average daily value flow at the existing WWTP is --
373,000 gallons per day. A review of the facility's DMRs shows that current flows are
actually higher than that, and are increasing. Nutrient data is available only starting from
2009. See table below for DMR flows and nutrient sampling results:
Time Period
Flow
MGD
TP
Ibs/month
TP
m L
TN
Ibs/month
TN
mg/L
2007
0.361
2008
0.400
2009 — April 2010
0.424
78.6
1.1
2402
19.8
Compliance
DMRs were evaluated for a period from January 2007 until the present. The many exceedances
listed include the following which were issued notices of violation or became part of enforcement
cases: Dissolved oxygen under the 6.0 mg/L limit 47 times; BOD-5 over the limit 18 times, the
latest being very recently; fecal coliform twice, once in October of 2007 and once in September

NPDES PERMIT FACT SHEET
Town of Pittsboro WWTP
NC0020354
2009; ammonia -nitrogen once and total suspended solids three times. In addition, monitoring
frequency violations were enforced four times during this evaluation period. Overall, the existing
facility has had a poor compliance record. This fact supports the decision to construct a new
facility.
Permitting Strategy
As stated, effluent from the proposed facility will be split into two outfalls: the 2.47 MGD new
outfall to the Haw River and the 0.75 MGD existing outfall into Robeson Creek. Separate limits
pages were proposed for outfalls 001 and 002. A third outfall, outfall C01, was created in order
to apply the nutrient limits that are in effect for the combination of both outfalls. Nutrient limits
were given both individually for each outfall, and collectively. The TMDL caps the discharge at
outfall 001 (Robeson Creek) at 322 pounds of TP for the summer season (April through
October). In addition, an existing TMDL and the Jordan Lake Rules limit the combined TN
input from the facility at 27,514 pounds per year, and TP at 3731 pounds per year. These
figures represent pounds delivered to Jordan Lake, and must be calculated using a transport
factor, which account for stream attenuation prior to discharge. TP and TN limits must be
calculated to account for loading to the lake, rather than loads measured at discharge points.
Transport Factors are as follows:
Outfall
TN Transport Factor
TP Transport Factor
001 Robeson Creek
76% -
99%
002 Haw River
82% -,
99%
The proposed nutrient limits (and several limits for conventional parameters) in both outfalls are
the same as shown in the speculative limits letter issued to the Town on July 25, 2008.
At the new outfall 002, parameters of concern, including nickel, copper, and zinc, will have a
monthly monitoring requirement. This monitoring frequency was proposed in accordance with
the Division's policy on monitoring frequencies for toxic substances. Nickel is included due to its
presence in the previous permit, in which it was limited and monitored weekly. For outfall 001,
the nickel limit will remain. Like nickel, zinc and copper (action level parameters) will be
monitored until it is shown that there is no reasonable potential for the effluent to cause an
exceedance of water quality standards in either receiving stream.
Toxicity Data
The existing facility passed all of its whole effluent toxicity tests from 2006 until the present.
Reasonable Potential Analysis
This permit modification request was to allow for an expansion of wastewater treatment
facilities. No new RPA analysis was conducted, since the proposed facility is new and the
permit covering the existing was modified very recently (July 9, 2010).
Changes from the Previous Permit
• Outfall 002 was added to allow for the expanded discharge into the Haw River. Grade IV
facility monitoring frequencies were applied.
A combined artificial outfall C01 was added in order to apply nutrient limits and conditions
applicable to the combination of outfalls 001 and 002. These conditions satisfy total
phosphorus and total nitrogen requirements for both TMDLs (Jordan Lake and Robeson
Creek).

NPDES PERMIT FACT SHEET
Town of Pittsboro WWTP
NCO020354
The TRC limit at outfall 001 was corrected to 17 yg/L. The standard footnote was added to'
state that the Division shall consider all effluent TRC values reported below 50 Ng/I to be in
compliance with this permit. The Permittee shall continue to record and submit all values
reported by a North Carolina certified laboratory even if these values fall below 50,ug/I.
Proposed Schedule for Permit Issuance
Because this permit expires on April 30, 2011, it was decided to combine this request for permit
modification with a renewal. A public hearing has been scheduled for March 29, 2011. Since
the final permit will not be ready to issue until after the end of April, the expiration date of the
new permit will be April 30, 2016.
Draft Permit to Public Notice: September 29, 2010
Public Hearing March 29, 2011
The final permit will be issued within 90 days of the close of the record after the public hearing,
at the discretion of the Director of Water Quality.
State Contact
If you have any questions on any of the above information or on the attached permit,
please contact Mr. Gil Vinzani at [phone], or at [e-mail]
SIGNATURE: Z' / /,44
DATE: May 19, 2011

IWC Calculations
Facility: Town of Pittsboro Outfall 002
NC0020354
Prepared By: GTV
Enter Design Flow (MGD): 2.47
Enter s7Q10 (cfs): 71.8
Enter w7Q10 (cfs): 125.6
Total Residual Chlorine (TRC)
Ammonia (Summer)
Daily Maximum Limit (ug/1)
Monthly Average Limit (mg NH3-N/1)
s7010 (CFS)
71.8
s7Q10 (CFS)
71.8
DESIGN FLOW (MGD)
2.47
DESIGN FLOW (MGD)
2.47
DESIGN FLOW (CFS)
3.8285
DESIGN FLOW (CFS)
3.8285
STREAM STD (UG/L)
17.0
STREAM STD (MG/L)
1.0
Upstream Bkgd (ug/1)
0
Upstream Bkgd (mg/1)
0.22
IWC (%)
5.06
IWC (%)
5.06
Allowable Conc. (ug/1)
336
Allowable Conc. (mg/1)
15.6
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/1)
Fecal Coliform
w7010 (CFS)
125.6
Monthly Average Limit:
200/100ml DESIGN FLOW (MGD)
2.47
(If DF >331; Monitor)
DESIGN FLOW (CFS)
3.8285
(If DF<331; Limit)
STREAM STD (MG/L)
1.8
Dilution Factor (DF)
19.75 Upstream Bkgd (mg/1)
0.22
IWC (%)
2.96
Allowable Conc. (mg/1)
53.6
Total Residual Chlorine
1. Cap Daily Max limit at 28 ug/I to protect for acute toxicity
Ammonia (as NH3-N)
1. If Allowable Conc > 35 mg/I, Monitor Only
2. Monthly Avg limit x 3 = Weekly Avg limit (Municipals); capped at 35 mg/I
3. Monthly Avg limit x 5 = Daily Max limit (Non-Munis); capped at 35 mg/1-
4. BAT for Minor Domestics: 2 mg/I (summer) and 4 mg/I (winter)
5. BAT for Major Municipals: 1 mg/I (year-round)
Fecal Coliform
1. Monthly Avg limit x 2 = 400/100 ml = Weekly Avg limit (Municipals) = Daily Max limit (Non -Muni)
NPDES Server/Current Versions/WLA; TB 1/16/2009

IWC Calculations
Facility: Town of Pittsboro Outfall 001
NC0020354
Prepared By: GTV
Enter Design Flow (MGD): 0.75
Enter s7Q10 (cfs): 0.03
Enter w7Q10 (cfs): 0.41
Total Residual Chlorine (TRC)
Daily Maximum Limit (ug/1)
Ammonia (Summer)
Monthly Average Limit (mg NH3-N/1)
s7Q10 (CFS)
0.03
s7Q10 (CFS)
0.03
DESIGN FLOW (MGD)
0.75
DESIGN FLOW (MGD)
0.75
DESIGN FLOW (CFS)
1.1625
DESIGN FLOW (CFS)
1.1625
STREAM STD (UG/L)
17.0
STREAM STD (MG/L)
1.0
Upstream Bkgd (ug/1)
0
Upstream Bkgd (mg/1)
0.22
IWC (%)
97.48
IWC (%)
97.48
Allowable Conc. (ug/1)
17
Allowable Conc. (mg/1)
1.0
Ammonia (Winter)
Monthly Average Limit (mg NH3-N/1)
Fecal Coliform
w7Q10 (CFS)
0.41
Monthly Average Limit:
200/100ml DESIGN FLOW (MGD)
0.75
(If DF>331; Monitor)
DESIGN FLOW (CFS)
1.1625
(If DF<331; Limit)
STREAM STD (MG/L)
1.8
Dilution Factor (DF)
1.03 Upstream Bkgd (mg/1)
0.22
IWC (%)
73.93
Allowable Conc. (mg/1)
2.4
Total Residual Chlorine
1. Cap Daily Max limit at 28 ug/I to protect for acute toxicity
Ammonia (as NH3-N)
1. If Allowable Conc > 35 mg/I, Monitor Only
2. Monthly Avg limit x 3 = Weekly Avg limit (Municipals); capped at 35 mg/I
3. Monthly Avg limit-x 5 = Daily Max limit (Non-Munis); capped at 35 mg/I
4. BAT for Minor Domestics: 2 mg/I (summer) and 4 mg/I (winter)
5. BAT for Major Municipals: 1 mg/I (year-round)
Fecal Coliform
1. Monthly Avg limit x 2 = 400/100 ml = Weekly Avg limit (Municipals) = Daily Max limit (Non -Muni)
NPDES Server/Current Versions/WLA; TB 1/16/2009

HEARING OFFICER REPORT
for the
Issuance of NPDES Permit NCO020354
Town of Pittsboro, NC
Pittsboro Wastewater Treatment Plant
This report is presented to the Director of the North Carolina Division of Water Quality.
INTRODUCTION
On February 17, 2011, public notices were published in the Sanford Herald and the Chatham
News to announce a public hearing on the draft NPDES permit renewal/expansion for the Town
of Pittsboro WWTP. The plant is currently permitted for 0.75 MGD with a discharge to Robeson
Creek. The town plans to construct a new 3.22 MGD facility, utilizing the existing 0.75 MGD
outfall and a proposed 2.47 MGD outfall into the Haw River. Both Robeson Creek and the Haw
River are classified as WS-IV NSW within the Cape Fear River Basin.
The public hearing was held in Pittsboro, NC on March 29, 2011. All written and oral comments
became part of the public record. The official record was closed after the hearing.
This Hearing Officer Report summarizes the major issues raised through the public hearing
process, as well as the hearing officer recommendations for the NPDES Permit. The Division
must take final action on these recommendations by June 27, 2011.
FACILITY BACKGROUND
The Town of Pittsboro presently operates an extended aeration 0.75 MGD wastewater
treatment plant that discharges into Robeson Creek. This creek is tributary to Jordan Lake,
flowing into the lake forming one of its northwest arms. Flows are so low that it may be
considered a zero -flow stream for wastewater permitting purposes. Algal blooms have been
observed within this arm during recent years and this reach of the stream has been placed on
the state's 303(d) list for chlorophyll -a. The causative pollutant is phosphorous. Robeson
Creek is subject to a Total Maximum Daily Load (TMDL) for total phosphorous (TP). This TMDL
limits future expansions to Robeson Creek.
Since future expansion in Robeson Creek was not feasible, the Town evaluated other
alternatives and ultimately selected a new discharge to the Haw River, which is subject to the
Jordan Lake nutrient TMDL. A final environmental impact statement (EIS) for the proposed
expansion was approved by DENR in a Record of Decision (ROD) dated March 29, 2010. The
EIS addresses the alternatives considered for wastewater disposal, treatment plant site
alternatives and wastewater conveyance alternatives.
The draft permit addresses the need for wastewater treatment for a growing population.
Additionally, the proposed new wastewater treatment facility will enable the town to comply with
its TMDL for phosphorus in Robeson Creek, as well as the Jordan Lake total nitrogen (TN) and
TP TMDL for its proposed Haw River outfall.
The TMDL for Robeson Creek sets a seasonal waste load allocation of 146 Kg (322 lb) for TP to
the Pittsboro WWTP from April through October. In addition, a nutrient TMDL was developed
Page 1

for Jordan Lake. Pittsboro was given a total waste load allocation of 27,514 pounds per year
TN and 3,731 pounds per year TP delivered at the lake. Transport factors for TN are 76% at
Robeson Creek and 99% for the Haw River US 64 bridge outfall. For TP the transport factors
are 82% for Robeson Creek and 99% for the Haw River US 64 site.
PUBLIC RECORD
Approximately 50 people attended the public hearing which was held by the Division on March
29, 2011. Twenty-one (21) attendees provided oral comments. Those opposed to the issuance
of the permit included members of the Haw River Assembly and the Carolina Canoe Club.
Comments in opposition of the permit are discussed below.
At least seven persons spoke in support of issuing the permit. These included the chairman of
the Chatham County Board of Commissioners, who reported unanimous support of the board
for this project. The Mayor of Pittsboro also expressed support. Those in favor spoke of need
for infrastructure, economic growth, and job creation. In addition, it was asserted that the need
for a better quality wastewater effluent would be provided by the new facility's superior
wastewater treatment technology.
The Division received notice from U.S. EPA Region IV on October 7, 2010 that they had no
comments regarding the draft permit.
Listed below are the major objections raised in written comments and the comments received at
the public hearing, and the Division staff responses. Appendix A contains a list of speakers and
submitted written comments.
Maior Comments and DWQ Responses
1. Comment: Members of the Carolina Canoe Club and others that use the Haw River for
paddling commented that the location of the new outfall on the Haw River at US Highway 64
was a bad choice, because it is a canoe access site with significant recreational use. A visible
outfall pipe would be an eyesore to paddlers, and produce a foul odor. There were also many
comments on potential human health impacts to recreational users who may come into contact
with treated wastewater in the river.
Response: The Haw River was recognized by the Division as the best alternative to receive
the expanded discharge. The alternatives analysis in the EIS considered other locations for the
new outfall. Expansion into Robeson Creek was not feasible, due to its low assimilative
capacity and its TMDL limit for phosphorus. Based on water quality modeling, the
recommendation was made to avoid a discharge on the Haw below US-64 or below Jordan
Dam. FOther alternatives, such as a,direct discharge into Jordan Lake or the Cape Fear River
below Jordan Dam, were more costly and would not provide the best wastewater assimilation.
The selected location received a more favorable environmental ranking than other proposed
outfall locations. In addition, the effluent will be reuse quality, which meets all water quality
standards to protect human health for discharges to WS-IV classified waters.
Page 2

2. Comment: Impacts to endangered species such as mussels and the Cape Fear Shiner were
not properly addressed.
Response: Impacts to endangered species were considered during the development of the final
environmental impact statement (EIS), as approved by the Record of Decision/Statement of
Findings (ROD). Buffers along the Haw River were set up to preserve priority habitats, and the
discharge force main will not cross any waters designated as a critical habitat for the Cape Fear
Shiner. A conclusion of the EIS was that endangered species would not be significantly
affected by the proposed project. The draft permit includes a requirement for quarterly effluent
toxicity testing using the water flea, Ceriodaphnia Dubia, which has been shown to be a
protective surrogate test organism for the Cape Fear Shiner.
3. Comment: The design flow of the proposed treatment facility not justified.
Response: Design flow was also considered during the development of the EIS. Flow
projections were based on a 20-year planning horizon, which accounted for population growth
and associated commercial/industrial growth for the Town of Pittsboro and areas within its ETJ.
Again, the Division supports the findings of the EIS, as approved in the ROD.
4. Comment: The permit should contain 3/week upstream/downstream monitoring, with no
waiver for coalition membership.
Response: As a member of the Upper Cape Fear River Coalition, the Town currently operates
under a waiver for instream sampling. The Division generally supports coalition monitoring,
because monitoring data obtained by a monitoring coalition is of higher quality than that
obtained from individual permittees. In addition, coalition monitoring provides better coverage of
the river basin, and produces more usable data about the watershed as a whole. However, the
Division recognizes that supplemental monitoring downstream of the proposed Haw River outfall
may provide valuable data.
5. Comment: The plant should have redundancy of wastewater treatment components.
Response: The Town must obtain an authorization to construct (ATC) for the new treatment
facility. The ATC will require dual train treatment, in which every major treatment component
will have a backup. In addition, a backup emergency generator must be provided in the event of
a power failure. The Division therefore believes that the plant will have adequate redundancy.
6. Comment: Nutrient trading should not be allowed if it results in higher nutrient loadings in
this effluent. The permittee should not be able to profit by selling unused allocation.
Response: Jordan Lake has a TMDL for nutrients (total nitrogen and total phosphorus).
Although transfer of nutrient allocations may be allowed by the Jordan Lake rules, there can be
no overall net increase in nutrient loading into Jordan Lake. Although the TMDL was fashioned
to protect the entire lake, and not the section of the Haw River near the proposed outfall, no
adverse nutrient -related impacts are expected from a well-treated wastewater discharge into a
free -flowing river. Further, it is very unlikely that the Town of Pittsboro would find it
advantageous to sell nutrient allocations.
Page 3

7. Comment: Wastewater reuse should be pursued more aggressively.
Response: The alternative of wastewater reuse was considered in the EIS. Presently, both the
Town and 3M Company have wastewater reuse permits from the Division to use Pittsboro's
treated effluent. In addition, the Town presently has a 500,000-gallon capacity elevated storage
tank for reuse water, for potential future uses. The town will utilize reuse -quality wastewater for
irrigation and non -potable uses to the extent possible
8. Comment The effluent pH limits should be changed from 6.0 to 9.0, to 6.0 to 8.0.
Response: The Division has no technical justification for requiring any pH limits other a range
of 6.0 to 9.0. This range is consistent with NC surface water quality standards for discharges
into freshwater.
HEARING OFFICER RECOMMENDATIONS
Based on review of the public record including written/oral comments received during the public
hearing process, I recommend to the Division Director that the 2011 Draft NPDES Permit
NC0020354 for the Town of Pittsboro be revised as follows:
Many of the commenters were people who canoe and kayak on the Haw River and put
their crafts in at the site of the proposed outfall. They expressed concern regarding body
contact with the treated effluent. The Town of Pittsboro intends to treat its wastewater to
reuse water quality standards. Therefore, as an extra measure of safety to the public,
recommend that outfall 002 permit limits for fecal coliform be modified to the reuse water
quality standards of 14 per 100 mL as a monthly average and 25 per 100 mL as a
weekly average.
2. As a member of the Upper Cape Fear River Basin monitoring coalition, the Town of
Pittsboro is exempt from performing instream sampling. To demonstrate that the effluent
discharge is not having a negative impact on the water quality of the Haw River, I
recommend including outfall 002 upstream and downstream monitoring for fecal coliform
at a frequency of 3/week in the months of June through September and 1/week the
remainder of the year.
In addition to the recommended permit revisions, I recommend the following:
The outfall pipe from the treatment plant to the river is approximately 4.4 miles long and
initial flows will most likely,be very low. These conditions can create low dissolved
oxygen and odors. To address this, as part of the Authorization to Construct, the
Division's Construction Grants and Loans Section should require the outfall to include
post aeration to increase dissolved oxygen prior to discharge into the river, for odor
control and to be more aesthetically pleasing.
Page 4

2. The results of monitoring performed for NPDES compliance are public record. In order to
make it easy for the public to access the results, I recommend that the Town of Pittsboro
make the results of instream and effluent fecal coliform monitoring readily available by
posting them as soon as possible on the Town's website. The results would not be "real
time" since the fecal coliform sampling method requires a 24-hour incubation period, but
it would allow those who are considering recreational use of the river to confirm the
compliance history, note any trends, and make an informed decision on whether or not
to get into the river. The Town should consider instream monitoring prior to the outfall
construction in order to have baseline results for comparison. The implementation of
this recommendation should be at the option of the Town.
L) "" -,,i,
Deborah Gore, Hearing Officer
APPENDICES
Date
A. Draft Permit
B. Announcement of Public Hearing
C. Public Hearing Registration Sheet
D. List of Speakers at the Public Hearing and Submitted Written Comments
Page 5

ESA
E4 A
North Carolina Department of Environment and
Beverly Eaves Perdue
Governor
Memorandum
To: Coleen Sullins ff,-
Thru: Matt Matthews/Jeoupart
From: Tom Belnick
Date: November 12, 2010
Division of Water Quality
Coleen H. Sullins
Director
Subject: Request for Public Hearing/Pittsboro NCO020354
o)\n
10,����
Natural Resources
Dee Freeman
Secretary
NPDES has drafted a major modification for the Town of Pittsboro WWTP, which provides for expansion from
0.75 to 3.22 MGD. This proposal retains the original Outfall 001 pennitted flow of 0.75 MGD to Robeson
Creek and adds a new Outfall 002 with permitted flow of 2.47 MGD to the Haw River. The discharge to
Robeson Creek is subject to a TP TMDL, and the combined discharge is subject to Jordan Lake Rules. This
proposed expansion was subject to a SEPA EIS, and a draft ROD was issued on 3/29/2010.
The draft permit modification was public noticed in the Sanford Herald on 10/1/2010, and this newspaper is a
daily with general circulation in the subject area. NPDES received comments on the proposed permit
modification from five (5) commenters, including two (2) requesting public hearing. A summary of comments
is attached. Substantive comments were provided by Elaine Chiosso, Executive Director Haw River
Assembly/Haw Riverkeeper. Ms Chiosso questioned several aspects of the SEPA EIS (e.g.,
threatened/endangered species, population projections, alternatives analysis, cumulative/secondary impacts). Ms
Chiosso originally requested a 30-day extension to the public comment period, which was denied.
NPDES believes the SEPA EIS and subsequent ROD adequately address the issues raised by the Riverkeeper
and recommends against a public hearing. Please let us know if you concur or need additional information.
1617 toad 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
Intelnet,ncwaterqum:ty org �aturall'y
An Equal Cpr'runitq , Af6rma <<e fiction 6rpicrer

l'
Beverly Eaves Perdue
Governor
MEMORANDUM
NC®ENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Coleen H. Sullins
Director
September 29, 2010
To: Michael L. Douglas, P. E.
DEH / PWS Section Regional Engineer
Raleigh Regional Office
From: Gil Vinzani
DWQ / NPDES Program
Raleigh Office
Subject: Review of Modified Draft NPDES Permit NC00020354
Pittsboro WWTP, Chatham County
Dee Freeman
Secretary
Please use a printed copy of this form to indicate your agency's position or viewpoint on this draft permit and return to
me by October 15, 2010. If you have any questions on the modified permit, please contact me at telephone number
[phone] or via e-mail at [e-mail]. Thank you.
RESPONSE: (Check one)
© Concur with the issuance of this permit provided the facility is operated and maintained properly, the stated
effluent limits are met prior to discharge, and the discharge does not contravene the designated water
quality standards.
❑ Concurs with issuance of this permit, provided the following conditions are met:
❑ Opposes the issuance of this permit, based on reasons stated below; -or attached:
Signed ` Date: 101511
1617 Mail Service Center, Raleigh, North Carolina 27699.1617
Location: 512 N. Salisbury St. Raleigh, North Carolina 27604
Phone, 919-807-6300 \ FAX: [phone] \ Customer Service: 1-877-623-6748
Internet http. / / h2o.enr state.nc us /
An Equal Opportunity \ Alfirmative Action Employer
D
i
T 72010
DENR-WATER-WATER QUALL
POINT SOURCE BRANCH
NorthCarohna
Naturally

r' i"i
��obbs Upchurch associates
z t,�
August 12, 2010
Gil Vinzani
NPDES Program, DWQ
RE: Pittsboro NPDES application NPDES NCO088943
Response to comments to application dated July 7, 2010
Commenting letter attached
Mr Vinzani,
Herein we offer our responses to your comments and requests for clairification of the
NPDES permit application for the proposed 3.22 MGD Pittsboro WWTP. Thank you.
1 Decommisioning:
The existing Pittsboro WWTP will operate until the new plant is ready to accept flow.
Transition between the two plants will be a matter of diverting flow incrementally from the
old plant to the new one. Since the new plant can treat more flow than the existing plant,
the new facility will accept all of the wastewater flow once it becomes seeded and
acclimated which should take approximately 6-8 weeks from start to finish.
There will be constructed a new bar screen, grit removal, and influent pump station rated
for a peak flow of 5700 GPM located adjacent to the existing headworks to make, use of the
existing collection system. These components will be built as part of the capitol project to
build the first half of the new plant. Once complete, the new plant will be seeded from the
existing one and gently cut over by routing part of the influent to the new headworks. The
new plant, once tuned and running, will accept all of the flow. Then the old plant will be
shutdown, pumped out, and cleaned. From that point, the existing structures will be
assessed for their applicability for future possible use as sludge digesters. If the plant
components are not applicable because of their age and condition then they will be
demolished.
The existing new equalization basin will be used for holding sludge for haul disposal during
the early years while it is not economically feasible to operate a sludge digester. The sludge
handling building will be preserved for future use.
It is not the intent of the town to have parallel NPDES permits and will abide by the permit
governing which ever plant is in operation. A 12 week overlap should be adequate for
establishing the new plant
T 910 686, 121? 1 H 91C S86 143 1 8262-201 MAR"FT STRHH' IN:i1,:,N, NC 28411 1 VVIAM H )RI=SU�CHIURCH,COM
SUPERIOR PF14FOR-MANCE T Fi't k;Uli iN°4OVATIVF DESIGN

Town of Pittsboro
NPDES Application Comments
8-12-2010
2 The existing outfall into Robeson creek will continue to be used. It has never had a
problem and will be a simple task to conduct treated effluent from the new plant to the
existing parshall meter and step aerator which subsequently flows to the outfall in Robeson
Creek.
3. Randy Heard (Pittsboro, Wastewater Treatment Plant Superintendent) stated that
Pittsboro has a letter from DWQ attesting that their pretreatment program is inactive
because they currently have NO SIUs attached to their collection system. There may be
some in the future, but for now they have none.
4 The New Pittsboro 3.22 MGD plant treatment components will be comprised of:
1 ea Influent Bar Screen, (rated for 5700 GPM peak flow)
1 ea Influent Grit.removal, (rated for 5700 GPM peak flow)
1 ea Influent Pump Station, (rated for 5700 GPM peak flow)
4 ea Anaerobic Basin, (810,000 GPD)
4 ea Oxidation Ditch with Anoxic Zone, (810,000 GPD)
4 ea Secondary Clarifiers, (810,000 GPD)
1 ea WAS/RAS Pump building returning sludge to Anaerobic Basins and Oxidation Ditchs at
3.22 MGD
4 ea Filters / Denitrification Filters, (810,000 GPD)
1 ea Sludge Storage Basin.
1 ea Treated WasteWater Pump Station'that will convey water to 1) Robeson Creek, 2) ,Haw
River, and 3) Reuse users.
2 ea Discharge structures 1) in Robeson Creek 0.75MGD; 2) in Haw River at 2.47 MGD
Sincerely,
Barry King, PE
Hobbs, Upchurch, & Associates, P.A.

NC®ENR
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins Dee Freeman
Governor Director Secretary
July 7, 2010
Mr. William Terry
Town Manager
Town of Pittsboro
P. O. Box 759
Pittsboro, NC 27312
Subject: Application for NPDES Permit
Permit No. NCO088943
Town of Pittsboro
Chatham County
Dear Mr. Terry:
Division personnel have conducted a preliminary review of your application for the subject permit. We have
the following questions regarding this application.
1. Please discuss the decommissioning of the existing facility, currently permitted under NC0020354.
How will this plant be phased out? What is the timing relative to the start-up of the new facility?
2. Will the existing outfall 001 be used for the 0.75 MGD from the new facility to Robeson Creek? Will
any other existing treatment components be used, including the existing sludge facilities?
3. The application does not contain any information regarding significant industrial users (SIUs). Will
the new facility treat only domestic sewage?
4. Please provide a detailed listing of the treatment components of the proposed facility.
Thank you in advance for your response. Should you have any questions, please contact me at 919-807-
6395, or by E-mail at [e-mail].
Sincerely,
ft'j/
Gil Vinzani, P�
NPDES Program
cc: Hobbs, Upchurch and Associates, P.A. / Adam Kiker, PE
Central Files
Raleigh --Regional Office / Danny Smith
NPDES Files
1617 Mad Service Center. Raleigh, North Carolina 27699-1617
Location 512 N Salisbury St. Raleigh, North Carolina 27604 One
Phone [phone]FAX, 919-807-64921Customer Service 1-877-623-6748 NorthCarolina
Internet ;vv,.%, ncwaterqual;ty org �y��//�
An Equal Ooporwty \ Allirmative Ac: 'j��at
on Emoloye, �/ V l l

Vinzani, Gil
From: Mckay, James
Sent: Wednesday, July 07, 2010 1:08 PM
To: Vinzani, Gil
Subject: FW: Low -flow characteristics for Haw River at U.S. 64... Re: Flow estimate for;Haw River at
US 64 bridge
Jim McKay, Environmental Engineer
NC DENR / Division of Water- Quality / Surface. Water Protection Section
Point Source Branch
1617 Mail Service Center, Raleigh, NC 27699-1617
919/807-6404 (work); 919/807-6495 (fax)
**Please note, my email address has changed to [e-mail]
E-mail correspondence to and firom this address may be subject to the North Carolina Public Records law and may be
disclosed to third parties.
From: John C Weaver [mailto:[e-mail]]
Sent: Tuesday, June 10, 2008 1:36 PM
To: James Mckay
Cc: John C Weaver
Subject: Low -flow characteristics for Haw River at U.S. 64... Re: Flow estimate for;Haw River at US 64 bridge
Jim,
In response to your inquiry about the low -flow characteristics (7Q10, 30Q2) for Haw River at U.S. Highway 64 near
Pittsboro in Chatham County (station id 0209699980, drainage area 1,296 sqmi), the following information is provided:
A check of the low -flow files here at the USGS North Carolina Water Science Center does not show a previous
determination of low -flow characteristics for your point of interest. In the absence of site -specific discharge records
sufficient for a low -flow analyses, low -flow estimates are assessed by determining a range of low -flow yields (expressed
as flow per square mile drainage area, or cfsm) at nearby locations where estimates have previously been determined.
Your point of interest is downstream and upstream of one active and one discontinued streamgaging stations,
respectively.
For this request, the flow characteristics at the upstream active streamgage (station id 02096960, drainage area 1,275
sqmi) can be considered applicable at your point of interest considering the small change in drainage area between the
two locations.
USGS Sta. 02096960 Haw River near Bynum, POR October 1973 to current, drainage area 1,275 sqmi
7010 = 71.8 cfs (equivalent to 0.056 cfsm)
3002 = 159 cfs (egtivalent to 0.125 cfsm)
Qavg = 1,240 cfs (equivalent to 0.97 cfsm)
Based on period during 1974-2007 climatic years
Note: The climatic year is the standard annual period used for low -flow analyses at continuous -record gaging stations. It
runs from April 1 through March 31 and is designated by the year in which the period begins. For example, the 2007
climatic year is from April 1, 2007, through March 31, 2008.

Please note a portion of the record within the above period of analysis contains discharge data (from October 2007
through March 2008) that is considered provisional and subject to revision pending further review and finalization of
discharge records.
A final comment... you identified coordinates in your email as the location for proposed Town of Pittsboro discharge point.
My examination of this location on the topo map indicates it is within the impounded reach of Haw River (Jordan Lake).
Please be aware the above estimates at U.S. 64 cannot be pro -rated further downstream because of the transition from
riverine to impounded flow conditions. While there is flow through the impounded reach, the USGS does not estimate the
7Q10 in these types of reaches because the effects of storage and circulation are not accounted for using the techniques
used to estimate low -flow characteristics.
Hope this information is helpful.
Thank you.
Curtis Weaver
J. Curtis Weaver, Hydrologist, PE
USGS North Carolina Water Science Center
3916 Sunset Ridge Road
Raleigh, NC 27607
Telephone: [phone] H Fax: [phone]
E-mail address -- [e-mail]
Internet address -- http://nc.water.usgs.gov/
James Mckay <[e-mail]>
06/06/2008 04:11 PM
Curtis
To John C Weaver <[e-mail]>
cc
Subject Flow estimate for Haw River at US 64 bridge
Could you please give me flow estimates for the Haw river just
downstream of the US 64 bridge? The approximate coordinates for a
proposed Town of Pittsboro discharge are 35 deg. 41, 55" Lat. and 79
deg. 04' 60" Long. I am working on another set of speculative limits
for them.
Thanks for your help,
Jim McKay
Environmental
Eastern NPDES
NCDWQ
Engineer
Program
[phone], ext. 595
2

Pittsboro Spec Limits Nutrient Loading
Data:
TN allocation at Jordan Lake =
TP allocation at Jordan Lake =
W LA for Robeson Creek =
Total W WTP capacity =
Outfall 001 to Robeson Creek =
Outfall 002 to Haw River =
TN transport factor for Robeson Creek =
TP transport factor for Robeson Creek =
TN transport factor for Haw River =
TP transport factor for Haw River =
Trial & error Calculations
Total Nitrogen
Operating Concentration, mg/L
2.9975
Total Phosphorus, mg/L
0.42187
27,514 lb/ year
, 3,731 lb/ year
322 lb TP April through October
3.22 mgd
0.75 mgd -
2.47 mgd -
76%
82%
99%
99%
TN discharged at 001: 6,843.52 lb/ year TN discharged at 002: 22,537.98 lb/ year
TN Delivered to Jordan TN Delivered to Jordan
from Robeson Creek: 5,201.07 lb/ year from Haw River: 22,312.60 lb/ year
Total TN delivered to
Jordan: 27,513.68 lb/ year Total
TP discharged at 001 TP discharged at 002: 3,172.01 lb/ year
April through October: 322.00 pounds TP delivered to Jordan
TP discharged at 001 from Haw River: 3,140.29 lb/ year
November through March: 398.46 pounds
TP Delivered to Jordan
from Robeson Creek: 590.78 lb/ year Total
Total Phosphorus
Delivered to Jordan: 3,731.07 lb/ year

c..I (1) R ve ' .;1adjord-m Lakv . isclma ge
Figure 9. Town of Pittsboro WWTP and Potential Discharge Locations for the balance of 2.47 MGD
[Haw River (US-64 Bridge) or Jordan Lake]
Town of Pittsboro, NC 41
Proposed lKastewater Treatment Plant and Discharges Into Robeson Creck and the Han- Rivet
11�1,% Hobbs, Upchurch & Associates, P.A. �,cprc^)N-i _NN%

t;.� L��cl�:tr�;t°�Itcrr2at_=rc:� (t:<yrat'cl%
C.2 (2) Preferred Additional Discharge Site: Haw River (US-64 Bridge)
The 2.47 MGD balance will be discharged at the Haw River US-64 bridge location, while
maintaining the current discharge of 0.75 MGD into Robeson Creek.
Nutrient Allocations
A guiding characteristic in selecting or proposing a wastewater discharge site is the associated
allotted nutrient loading. With the anticipated future service requirements that will be placed
on the Pittsboro wastewater system, the plant capabilities at maximum flow must be taken
into consideration now.
The main impact to water quality in Jordan Lake is algae growth. Excessive algae growth
spawns eutrophication of the lake and unpleasant odors in water supplies. Since algae grow
in warm water with the appropriate nutrient supply, the only way to effectively stop
eutrophication is to remove or prohibit the nutrients in the water before the algae cycle
starts. To this end, the NCDENR has established allocations of nutrients to communities
along the Haw River for planning their developmental futures. With these allocations towns
can choose the amount of development or treatment that is right for them, knowing that
they may not go beyond the established mass of nutrients that may be discharged.
Another facet of the design process is the assimilative capability of the river for removing
nutrients from the effluent before reaching the lake. Table 13 was developed from the
Speculative Limits provided by the DWQ NPDES Unit in July 25t'' 2008 (See Exhibit G-2).
The table shows the nutrient loading allocated to the Pittsboro community and modeled
total discharges at various locations in order to achieve that allocation. Different surface
water discharge sites have different assimilative capabilities and the net discharge will vary by
the percent listed in the table. Fundamentally, the more surface area, oxygen, and traveling
time that is available to the treated wastewater, the more the nutrients that are removed from
the water. For discharging directly *to the lake -there is no assimilative consideration and the
net discharge equals the allotted discharge.
"town of Pittsboro, NC 42
Proposed Wastewater Treatment Plant and Discharges Into Robeson Creek and the Haw River
:',:�`%
Ptcmucd N, Hobbs, Upchurch & Associates, P.A.

< a2 aref rr f-cl Dhicli.li,4,,,e Altt i• mtiv e: Hi iv IV cr (l J 5-ri4 Bri(k e)
Table 13. Nutrients Allocations for Potential Discharge Sites: Haw River and Jordan Lake
Nutrient
Robeson Creek
Haw River
at 64 Bridge
Jordan Lake
Discharge
Mass (lbs)
Transport
Factor
Mass Qbs)
Transport
Factor
Mass (lbs)
Transport
Factor
Total Nitrogen
5,153
77%
22,361
99%
27,514
100%
Total Phos�horus
1 449
1 82%
1 1,807
1 99%
3,731
1 100%
Source: Nutrient poundage is based on the Speculative Limits provided by DWQ — NPDES Unit in July 2008
(Exhibit G-2).
Discharge L.ocalion Alternatives- Conclusions
The (US-64) discharge is the location of least overall impact based on:
■ The US 64 bridge site would provide one mile of natural turbulent mixing (enhanced
assimilation) upstream of Jordan Lake. The location offers capacity for turbulent
mixing and re -oxygenation,' due to abundant rocky rapids upstream of pool level in
Jordan Lake thus providing abundant oxygen for any residual BOD in the effluent
stream.
■ The US 64 bridge site would have negligible effect on forest resources as opposed to
the lake discharge site which would require crossing 0.5 miles of a natural heavily
forested area (See discussion in Exhibit D-2).
• A discharge in Jordan Lake would affect more recreational users since more people
swim in the lake as opposed to the river (Michael Hosey, US Corp of Engineers,
personal communication, November 2006).
■ Discharging into Jordan Lake provides little of what is needed to completely degrade
the wastewater stream. 1) Little mixing occurs on the slow moving lake bottom with
only the energy of the diffuser to move the water. 2) In summer the established
thermochne will further isolate the discharge stream from oxygen available at the
Lake's surface further causing oxygen deficits. 3) During periods of low flow the lake
can have stagnant zones; therefore, the nutrients in the lake would be more
concentrated in regions close to the diffuser adding to the potential for excessive
algae growth as observed in the mouth of Robeson Creek.
Town of Pittsboro, NC 43
Proposed Wastewater'rreattnent Plant and Discharges Into Robeson Creek and the Ha%v River
Pig. ,ue i hv Hobbs, Upchurch & Associates, P.A. carcmha 2W")

e ep"° a s�• ae��e o o°°. �^ � pf r y9 Legend
"s
° " °q° a. e Ir ,a�•a. °,`° �a...;;f_',.°d_p:a,°^°., 'a"•' °.° *�Q..o e a*,��n,�4 ••i\'ra° e ,`F° u�" ab'd° ° ra.n L. Flood Zone
.,�. �m �o `. m"iC�2•••�-°r6" yyr�P�.•:.Qv. •, f
T­ �aE °
—1P>c4° flAFW
p, � Map srod.dx
li
p. eta'a� ePo aKn.,�eaM.
Pro sed"aw
° - y,,,y •°.. RwerDischar
��IA�IP w�M.a�d �� " r„� �°.,w `��" y�°'..fps�.,".A.'JX�^ ,�¢�e�• a'0 °��""r�-$� .�'^t°�� 6"q+
'� b..°��t a ^� a r :�¢.�' �. .ods -€e r'��l.;;awn'° ��A.. � -ar;,+•�°g�° <�;°� - �ti'��..� ° —ate,c.ma..
tea �_�� p °"`� d�e � +E �'4° °°.,.�3 'T „I, Qp�,�� b ��'"�.°.a°j°° �`"_� 1� '�o s.r.( � •��e 'i,,.�
p'"' �,. b�.° •p a °'Aa: t� Route A °.`!'° +. .i d p ! ro °r d ,w 4n
° .�'°Q.�.�o"• � agy.r �e. a Ppt
roposed 23.000 LF •°� �C$;, � �..t. ��,ee E7 .ct� w e' '�,e �"��
;^,--��,. 'Y'o• gfel. �'e.—+ °P' °�e�•'—$^"o, :'� Discharge Mam '�`� eS°�'� '��. �•wd3` ., ,.mow•• .g" °f
d ° ° b" .M '.��° ° °l��."" q�d��'"° I' a °'�'1,°wl°i9�.nmp °� .� "�e�°e� k°. .•o °j� <,�,���'°..y�°
T.VU, F11T.S60R
_
MW ��
ou1'.,
ProposeRd ,100 LF > e•a.e y�.
(1° f ° �• a �° Discharge Mai
•°°• "'^w- �, s °t`"e' ¢
u Center Township,° 4° .A p ,
- p° °-+ a r� as rM° �. . e�• �� ° ,°
PntsboroWVJTA >; w"'J@ ° ° °t ,s A' � dyv, o •,� °257-° de . °,o°, ° °1°a, a, :a.'^`
P oposed 16-Acre Sire' a°, °qw :fie, ° ten `^-�.is "" �`P �' °,:a,@@•v, ,r•o ° wn .,., _`4 °�°�. ,+
1 Improvements a ti°aa E x' hgbe'
�:� �"� r 8 d v .' e ,,t¢�a Y "�•;j ..B°t"°°�er`.n�° Q ytyS��e��,,, •b� ��'"�°a`°°° .cv� q}`'e���Rt�". "°�°
° ni ��56' ° .�b�,-� .�a _ "e'��3••� ' a�', v $. � p� �p c� 't«° .�« o°S� a•` a 6.� 0°` °P$ s` 4id ,¢`Pe
^`Q!06
"er,o r° s�4. -��O° 'A9a��,•_'S �Dy° ��� ,°t:° °, ° t."°a °e aF'n"��e a.J.��y��y �icd ,9GM �I'+ ��+"�° a _0 1 °b �
A FLOOD ZONE Area %of County <j*• °�` ew "" \ °�°p 7
?°
Q4 oQ �,�•e°,�`v,°,� F acres Area ti
' roposesdcJhoarrdanI
ge
AL 45789 101 Lake Di
21.
°
�� I
555 0.1 a� �k�.
r,.r<�,w°
° fid t t� g b Sl LADED X 262 01
Ate. D SUM OF AREAS 46605 10.3 °°N C E9e° aa: A;
�s1��g
CHATHAM COUNTY 454311
acres
°° Hobbs,Upchurclr,.F.4saociatrs,P4. �TO��rII Of ttSUOCO
#.°a'b:•, ^�'�"�..L.a..°�,.�.. ,`, _
ro �`� Cousuhbr Engineers
a 1,250 2,500 5,000 22500 "� 1!878 VWHn�gl7Srr.5 Chatham' 'County NC
ftM I Hatepstead.V ,28443 Flood Wnl
Figure 3.Floodplains at the Pittsboro WWTP and along the Haw River and Jordan Lake Discharge Routes
Town of Pittsboro,NC °
Proposed Wastewater Treatment Plant-Evaluation of Discharge Alternatives 6
Prrpmcd by Hobbs,Upchurch&Associates,11 A ,Ah1il 2008
Sxhibrt D-2

Table 7 CAPE FEAR Subbasin 03-06-04
AU Number Classification Length/Area
Aquatic Life Assessment
Recreation Assessment
Year/
Description AL Rating
Station Result Parameter % Exc
REC Rating Station Result Stressors Sources
:Mar s Creeks = , y' r �'�',
I6-26 C NSW 10 1 FW Miles S
ND Habitat Degradation
From source to Haw River
BB377 GF '2003
BB377 NR '2003
BB377 GF 2000
€'Pokeb6rrCreek'.. >r ;.,
16-37 WS-IV NS 8.0 FW Miles S
ND Habitat Degradation Land Clearing
From source to Haw River
BB320 GF '2003
BB320 GF '2003
,_. - w y, k<< ..'ter -- ..-�,t ic« j ","„'.'.,,"'R°".,,...,...—..,
WVV - '�"'' "•�•'i, +"'R"^�«;• >-;,i "-"�Z'�..� ,�`?�,'- �. ,,.F,�
- M•
; ::£',
WS-IV NS 16 7 FW Acres NR
BLI I NCC'-Chlora' - 10C y
ND Chlorophyll a Impervious Surface
Pittsboi o Lake
— .. _ _ _
--- Chlorophyll a W WTP NPDES
\S '24 FW Miles
I, m I'iu,boio Lake to UT across from SR 1951
16-38-(3)d WS-IV NS 3 1 FW Miles S
Fiom UT across from SR 1951 to Jordan Reservoir
ND Habitat Degradation
BB12 F '2001 Habitat Degradation
BB16 F '2001
Habitat Degradation
BB45 F '2001
B13189 GF 2001
BB189 F '2001
BF16 G 2003
ND Habitat Degradation
ND land app site
Impervious Sofao
WWTI1 NPDES
16-32 WS-IV NS 7.6 FW Miles S
From source to Haw River
BF43
G
2003
ND
Y
'_'�'�-.'-x••�,,,--''`7„'•r••�F,t�?w.s' �,4k.'.• ,�„&•i
TerrellsrCreek' South Side
y
..«. �`I'TT„�" _
.'.yQ.'. K''.'Y4hi'1.,'��.�x4.4.-- ^Y:i... ..�.
Ha_'River,'
16-31-(2 5) WS-IV NS 6.7 FW Miles S
ND
Low Dissolved Oxygen
From Cattail Creek to Haw River
BB158
GF
2003
BB158
F
'2003
BF9
E
'2003
CAPE FEAR Subbasrn 03-06-04
a

Table 7 CAPE FEAR Subbasin 03-06-04
AU Number Classification Length/Area Aquatic Life Assessment Recreation Assessment
Year/
Description AL Rating Station Result Parameter % Exc REC Rating Station Result Stressors Sources
i , o-- t,Po j�,.,.r .;.�; „�'--r' ;, 'r'" v:
.i ?r, ;.F; .okr-S'.:-'Jd," �^--.i,�Zt',-.Q�� ":d.�s G'i:''�.,+�!'" -'t` -..HAW'=RIVER'';' �._... ��; ,:. -.ri .. -r,;= 5 �. .. �..� _ '�.cP�/a,:-...:_'-�w�z3�'`.�e:. 'ai'�. ..�:,..�_:i_�§�;a :&-.'.�`� �'^ �.....___' _�'u.. '.._, .. .. .. .:. �. �4�°`
16-(28 5) WS-IV NS 11 4 FW Miles S BA135 NICE S BA135 NCE
From a point 0 4 miles downstream of Cane Creek (South
side of Haw River) to a point 0 4 miles downstream of
Brooks Branch
16-(36 3) WS-IV NS 05 FW Miles S
From a point 0 4 miles downstream of Brooks Branch to
Pittsboi o water supply intake (located 0 3 miles upstream
of Pokeberry Creek)�J�
BA139
NCE
S BA139 NCE
I6-(16 7) \V4-IV NS 18 I'VV Mils, S
$ AI(�'�
_
J Q3 Q 02—
I iimi 1'11t.how ri.itci supply intake to .i pouit 0,5 nnlc
BB443
G '2002
t hi �Q
dutiic,Li-uu of U S. 11w. 64
y�
I6-(37 3) WS-IV NS 53.2 FW Acres I
BL1
CE Chlor a 33
ND
High pH Agriculture
BL1
CE High pH 23 -`
High pH Impervious Suifao
From a point 0.5 mile downstream of US Hwy 64 to
High pH MS4 NPDES
approximately 1 0 mile below US Hwy 64
High pH WW"rP NPDES
Chlorophyll a Agriculture
Chlorophyll a Impervious Surfao
Chlorophyll a MS4 NPDES
Chlorophyll a W WTP NPDES
Haw River..=,(B.-Eger=,ett„J,ordan Lake,below,
=_.� ar '-
4
normal ool;'el`e�atio
._� x•
16-(37 5) WS-IV&B 1,392.3 FW Acres 1
BA150 CE Chlora
24 ND
High pH
Agriculture
BLl • CE Chlor a
33
High pH
Impervious Suifac,
BL1 CE High pH
23 5
High pH
MS4 NPDES
From approximately 1 0 mile below U.S. Hwy 64 to dam
at B Everett Jordan Lake)
High pH
W WTP NPDES
Chlorophyll a
Agriculture
Chlorophyll a
Impervious Surfao
Chlorophyll a
MS4 NPDES
Chlorophyll a
WWTP NPDES
CAPE FEAR Subbasin 03-06-04

Vinzani, Gil
From: [e-mail]
Sent: Thursday, October 07, 2010 4:32 PM
To: Vinzani, Gil
Cc: [e-mail]
Subject: NC0020354 Pittsboro draft permit - review complete.
Mr. Vinzani (Gil),
Once I located the application notebook here in our office I found the answers to my
questions about the draft permit.
EPA has no formal comments at this time. If substantial changes or edits are made to the
draft permit please allow Region 4 to review them prior to final issuance.
A copy of the standard conditions (Parts II, III, and IV) for our files may follow at your
earliest convenience.
If you require a more formal letter for your files, I will be happy to prepare one for you.
Thank you.
Pamala Myers
Pamala Myers
404.562.9421
[e-mail]
Environmental Engineer and Technical Advisor I Pollution Control and Implementation Branch
Water Protection Division I Municipal and Industrial NPDES Section U.S. EPA, Region 4 1 61
Forsyth St. SW I Atlanta, GA 30303
From: "Vinzani, Gil" <[e-mail]>
To: Pamala Myers/R4/USEPA/US@EPA
Date: 10/06/2010 04:56 PM
Subject: RE: NC0020354 Pittsboro draft modification questions
Hello, Pamala:
I

FACILITY NAME AND PERMIT NUMBER:
PERMIT ACTION REQUESTED:
RIVER BASIN:
Town of Pittsboro; NCO020354
A.11. Description of Treatment
a. What level of treatment are provided? Check all that apply
Primary Secondary
Advanced ❑Other. Describe: Tema^, hers uv
b. Indicate the following removal rates (as applicable)
Design BOD5 removal or Design CBOD5 removal 8 — %
Design SS removal 85 %
Design P removal blon.iof and Reznort %
Design N removal Monitor and Report %
Other %
C. What type of disinfection is used for the effluent from this outfall? If disinfection varies by season, please describe:
IN
If disinfection is by chlorination is dechlorination used for this outfall? ❑ Yes ri No
Does the treatment plant have post aeration? ❑ Yes [,1 No
A.12. Effluent Testing Information. All Applicants that discharge to waters of the US must provide effluent testing data for the following
parameters. Provide the indicated effluent testing required by the permitting authority for each outfall through which effluent is
discharged. Do not include information on combined sewer overflows in this section. All information reported must be based on data
collected through analysis conducted using 40 CFR Part 136 methods. In addition, this data must comply with QAJQC requirements of
40 CFR Part 136 and other appropriate QA/QC requirements for standard methods for analytes not addressed by 4.0, CFR Part 136. At a
minimum, effluent testing data must be based on at least three samples and must be no more than four and one-half years apart.
Outfall number:
MAXIMUM DAILY VALUE
AVERAGE DAILY VALIJE:
PARAMETER
Value
Units
Value
Units
Nli'imber of Samples
pH (Minimum)
6.0
S.U.
CONTINUOUS
pH (Maximum)
9.0
s.0
Flow Rate
.E5
11AGD
.400
MGD
Temperature (Winter)
'I0
> .
14
Degrees C
DAILY
Temperature (Summer)
25
C
25
Degrees C
DAILY
_
' For pH please report a minimum and a maximum daily value
MAXIMUM DAILY
DISCHARGE
AVERAGE DAILY DISCHARGE
POLLUTANT
ANALYTICAL
ML/MDL
Conc.
Units
Conc.
Units
Number of
METHOD
Samples
CONVENTIONAL AND NON CONVENTIONAL COMPOUNDS
BIOCHEMICAL OXYGEN
BOD5
7.v
V1Ci11
2� 15
'� 5;!
3/Week
SM5240Eit
DEMAND (Report one)
CBOD5
f iA
0 G
FECAL COLIFORM
40t
rVICfl
20
3!i(Y`eek
SM9222Lt
r n!
TOTAL SUSPENDED SOLIDS (TSS)
45
Mgil
5
mgii
3rVVeek
SM2540D
1-
" END OF PART A. '
REFER 'TO ;THE APPLICATION OVERVIEW (PAGE 1) TO DETERMINE WHICH OTHER PARTS
OF FORM 2A YOU MUST COMPLETE
NPDES FORM 2A Additional Information

FACILITY NAME AND PERMIT NUMBER:
PERMIT ACTION REQUESTED:
RIVER BASIN:
Town of Piitsboro. NCO020354
enewal
Cape Fear
L
is
BASIC APPLICATION INFORMATION-77
PART B.. ADDITIONAL APPLICATION INFORMATION FOR.APPLICANTS WITH A DESIGN FLOW.(:iREATER THAN OR
EQUAL TO 0.1 MGD (100,000 gallons per day).
All applicants with a design flow rate 2: 0.1 MGD must answer questions B.1 through B.6. All others go to Part C (Certification).
B.I. Inflow and Infiltration. Estimate the average number of gallons per day that flow into the treatment works from inflow andior infiltration.
5,000 GPD
Briefly explain any steps underway or planned to minimize inflow and infiltration.
We have had severalf_oiects to repo o�!r I>!_ -:-= r, ',-u'e are_c� rrn+tiv�nonl: I n cl; our _phase ill t sho! I!d ga otlt to b;d
in early 2011 - ------ - ----- - -- - -- - ------------- -
8.2. Topographic Map. Attach to this application a topographic map of the area extending at least one mile beyond facility property boundaries. This
map must show the outline of the facility and the following information. (You may submit more than one map if one map does not show the entire
area.)
a- The area surrounding the treatment plant, including all unit processes.
b. The major pipes or other structures through which wastewater enters the treatment works and the pipes or other structures through which
treated wastewater is discharged from the treatment plant. Include outfalls from bypass piping, if applicable.
c. Each well where wastewater from the treatment plant is injected underground
d. Wells, springs, other surface water bodies, and drinking water wells that are: 1) within Y. mile of the property boundaries of the treatment
works, and 2) listed in public record or otherwise known to the applicant.
e. Any areas where the sewage sludge produced by the treatment works is stored, treated, or disposed
f. If the treatment works receives waste that is classified as hazardous under the Resource Conservation and Recovery Act (RCRA) by truck, rail,
or special pipe, show on the map where the hazardous waste enters the treatment works and where it is treated, stored, and/or disposed.
B.3. Process Flow Diagram or Schematic. Provide a diagram showing the processes of the treatment plant, including all bypass piping and all
backup power sources or redunancy in the system. Also provide a water balance showing all treatment units, including disinfection (e.g.,
chlorination and dechlorination). The water balance must show daily average flow rates at influent and discharge points and approximate daily flow
rates between treatment units. Include a brief narrative description of the diagram.
B.4. Operation/Maintenance Performed by Contractor(s).
Are any operational or maintenance aspects (related to wastewater treatment and effluent quality) of the treatment works the responsibility of a
contractor? 1:1 Yes E No
If yes, list the name, address, telephone number, and status of each contractor and describe the contractor's responsibilities (attach additional
pages if necessary).
Name. _
Mailing Address:
Telephone Number:
Responsibilities of Contractor
B.5. Scheduled improvements and Schedules of Implementation. Provide information on any uncompleted implementation schedule or
uncompleted plans for improvements that will affect the wastewater treatment, effluent quality, or design capacity of the treatment works. If the
treatment works has several different implementation schedules or is planning several improvements, submit separate responses to question B.5
for each (If none, go to question B.6.)
a- List the outfall number (assigned in question A.9) for each outtall that is covered by this implementation schedule.
b Indicate whether the planned improvements or implementation schedule are required by local, State, or Federal agencies.
17 Yes X No
NPDES FORM 2A Additional Information
1
a

FACILITY NAME AND PERMIT NUMBER:
PERMIT ACTION REQUESTED:
RIVER BASIN:
Town Of Pittsboro, NCO020354
Re.n;✓wai
gape Fear
C. If the answer to B.5.b is "Yes," briefly describe, including new maximum daily inflow rate (if applicable).
d. Provide dates imposed by any compliance schedule or any actual dates of completion for the implementation steps listed below, as
applicable. For improvements planned independently of local, State, or Federal agencies, indicate planned or actual completion dates, as
applicable. Indicate dates as accurately as possible.
Schedule Actual Completion
Implementation Stage MM/DD/YYYY MM/DD/YYYY
Begin Construction
End Construction
Begin Discharge
Attain Operational Level
e. Have appropriate permits/clearances concerning other Federal/State requirements been obtained? i 1 Yes ! No
Describe briefly
B.6. EFFLUENT TESTING DATA (GREATER THAN 0.1 MGD ONLY).
Applicants that discharge to waters of the US must provide effluent testing data for the following parameters. Pa ovide the indicated
effluent testing required by the permitting authority for each outfall through which effluent is discharged. Do not include information
on combine sewer overflows in this section. All information reported must be based on data collected through analysis conducted
using 40 CFR Part 136 methods. In addition, this data must comply with QA/QC requirements of 40 CFR Part 1:16 and other appropriate
QA/QC requirements for standard methods for analytes not addressed by 40 CFR Part 136. At a minimum effluent testing data must be
based on at least three pollutant scans and must be no more than four and on -half years old.
Outfall Number:
MAXIMUM DAILY
DISCHARGE
AVERAGE DAILY DISCHARGE
POLLUTANT
NALYTICAL A
MUMDL
Conc.
Units
Conc.
Units
Number of
METHOD;
Samples
CONVENTIONAL AND NON CONVENTIONAL COMPOUNDS
AMMONIA (as N)
2.0
M911
0.3
114g1!
31week
4500
CHLORINE (TOTAL
RESIDUAL, TRC)
28
Ugh
<q0
Ugrl
3iweeK
srn4S00ctq
DISSOLVED OXYGEN
>R 1j
Mg,l
7.0
Vlg/I
Daily
Sm4500og
TOTAL KJELDAHL
NITROGEN (TKN)
fUlonitor
and report
Mg/1
2'c
i10g/I
%.early
Epa351.2 .
NITRATE PLUS NITRITE
NITROGEN
hilcnitor,
and report
ilnoll
30.0
iNg/i
weekly
Epa353.2
OIL and GREASE
NA
NA
N.A
NA
NA
NA
PHOSPHORUS (Total)
2.0
4figh
1
iJtcil
Weekly
Sm4500pq
TOTAL DISSOLVED SOLIDS
(TDS)
Per,
NA
NA
NA
NA
NA
OTHER
END'OF PART B.
REFER, TO THE -APPLICATION OVERVIEW (PAGE 1) TO DETERMINE WHICH OTTIiER PARTS
OF FORM 2A YOU MUST COMPLETE'
FORM 2A Additional Information

FACILITY NAME AND PERMIT NUMBER:
PERMIT ACTION REQUESTED:
RIVER BASIN:
Town of Pittsboro NCO020354
Renewal
Cape Fear
BASIC APPLICATION, INFORMATION 1
PART C. CERTIFICATION
All applicants must complete the Certification Section. Refer to instructions to determine who is an officer for the purposes of this
certification. All applicants must complete all applicable sections of Form 2A, as explained in the Application Overview. Indicate below which
parts of Form 2A you have completed and are submitting. By signing this certification statement, applicants confirm that they have reviewed
Form 2A and have completed all sections that apply to the facility for which this application is submitted.
Indicate which parts of Form 2A you have completed and are submitting:
® Basic Application Information packet Supplemental Application Information packet:
r_ Part D (Expanded Effluent Testing Data)
Part E (Toxicity Testing: Biomonitoring Data)
r_ Part F (industrial User Discharges and RCRA/CERCLA Wastes)
i Part G (Combined Sewer Systems)
ALLAPPLICANTS MUST COMPLETE THE FOLLOWING CERTIFICATION.. , .
I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system
designed to assure that qualified personnel properly gather and evaluate the information submitted Based on my inquiry of the person or persons who
manage the system or those persons directly responsible for gathering the information, the information is, to the best of my knowledge and belief, true,
accurate, and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment
for knowing violations.
Name and official title jjohn �oteat. Put'110 Pna U'dives Director
Signature t "'
Telephone number (9 i9L542-2.530
Date signed ! lC'
Upon request of the permitting authority, you must submit any other information necessary to assure wastewater treatment practices at the treatment
works or identify appropriate permitting requirements.
SEND COMPLETED FORMS TO:
NCDENR/ DWQ
Attn: NPDES Unit
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
PDES FORM 2A Additional Information

Forth Carolina
Department of Administration
Beverly Eaves Perdue, Governor
Secretary
March 29, 2010
Ms. Hannah Stallings
NCDENR, Water Quality
1617 Mail Service Center
Raleigh, NC 27699-1617
Moses Carey; Jr.,
Re: SCH File ## M4=E-4300-0290; FEI.S; flitsboro 3.2.2 MGiD wastewater treatment plant with
dual discharges to R6beso6 Creep and the Haw River
Dear Ms. Stallings:
The above referenced environmental impact information has been reviewed through the State
Clearinghouse under the provisions.oftheNorth Carolina Environmental Policy Act.
No comments were made•by any state%local agencies in the course of this review. Therefore, no further
environmental review action on your- part.is required for"the compliance with the -Act.
Best regards.
cc: Region J
CDs & 2 hard copies
CDs
Nlailing Address:
1301 Mail Service Center
Raleigh, NC 27699-1301
Sincerely,
410� - - 01
Ms. Chrys Baggett
State Environmental Review Clearinghouse
Telephone: [phone]
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North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins
Governor Director
March 29, 2010
To: Chrys Baggett, State Clearinghouse
From: Hannah Stallings, NCDENR/Division of Water Quality IN
Subject: Record of Decision for the proposed 3.22 MGD Pittsboro WWTP with dual discharges to
Robeson Creek and the Haw River
Dee Freeman
Secretary
The Division of Water Quality is submitting for State Clearinghouse review the enclosed ten copies of the Record of
Decision for the subject project for a 30-day information only posting in the Environmental Bulletin.
The Draft EIS was reviewed under SCH #10-E4300-0140 and the Final EIS of the SCIMP was reviewed under SCH #10-
E-4300-0290.
Please publish this project in the Environmental Bulletin and circulate as appropriate.
Contact me at 807-6434 if you have any questions.
Thank You.
Enclosures
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RECORD OF DECISION
ENVIRONMENTAL IMPACT STATEMENT (EIS)
WASTEWATER TREATMENT PLANT
WITH DUAL DISCHARGES TO ROBESON CREEK AND THE HAW RIVER
TOWN OF PITTSBORO, NORTH CAROLINA
PREPARED BY THE:
NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
PLANNING SECTION
DWQ#14115; DENR#1501
MARCH 29, 2010
CONTACT PERSON:
HANNAH STALLINGS, DWQ SEPA COORDINATOR

An EIS has been prepared for wastewater treatment facilities for the Town of Pittsboro, and the proposed
action is to construct a new wastewater treatment plant (WWTP) with a treatment capacity of 3.22 million
gallons per day (MGD) to satisfy the 20-year planning horizon of the service area outlined in the EIS,
including currently incorporated areas of the Town, areas in the Town's extraterritorial jurisdiction (ETJ),
and areas beyond the ETJ that are under Chatham County's jurisdiction. This WWTP will maintain the
Town's currently permitted 0.75 MGD discharge to Robeson Creek and the remaining 2.47 MGD will be
discharged to the Haw River. The proposed design will achieve enhanced Biological Nutrient Removal in
a single sludge staged bioreactor. Major components in the WWTP will include a new influent pump
station, preliminary treatment facilities, bioreactors, clarifiers, tertiary filters, a UV disinfection system, a
12-inch effluent discharge flume, and a biosolids handling facility. The new WWTP will be required'to
meet the nutrient limitations for discharges into the Jordan Lake watershed. Also, the WWTP will be
capable of producing reuse quality effluent as measured for the effluent standards for five-day
biochemical oxygen demand (BOD5), total suspended solids (TSS), and fecal coliform. The selected
alternative and the anticipated environmental impacts are fully discussed in the EIS. Identified funding
for this project consists of a public/private partnership that Pittsboro is exploring, as well as potential
grant and loan funding sources; the Town will not secure Federal funding for any portion of the project
outlined in the EIS.
PURPOSE
The purpose of this EIS for the new 3.22 MGD Robeson Creek WWTP is to satisfy SEPA requirements
to address the direct, secondary, and cumulative impacts directly caused by construction of the proposed
project or supported by growth within the WWTP's service area during the next 20 years. The EIS
provides a detailed accounting of the likely impacts to the environment and culturaUhistorical resources
for each of the treatment and effluent disposal alternatives, and contains mitigation strategies to address
impacts resulting from the preferred treatment and disposal alternatives.
ALTERNATIVES
Several alternatives were identified during the planning process and the EIS provides a full discussion of
those that were considered for a thorough evaluation. The preferred wastewater treatment alternative and
the preferred effluent discharge alternative were independently determined to be the least environmentally
damaging alternatives that met Pittsboro's 20-year planning horizon needs.
Five alterpatives were considered for wastewater treatment:
1. No Action.
2. Expansion of the existing Robeson Creek WWTP.
3. Construction of a new Robeson Creek WWTP. (This is the preferred treatment alternative.)
4. Connection to another publicly -owned WWTP.
5. Land application by spray irrigation.
Pittsboro will maintain its existing discharge volume of 0.75 MGD to Robeson Creek with the new
WWTP as long as the new facility can maintain effluent limitations outlined in the Roberson [sic] Creek
TMDL. Two alternatives were considered for disposal of the remaining 2.47 MGD:
1. Haw River at the US-64 bridge. (This is the preferred second discharge alternative.)
2. Jordan Lake.

10
Pittsboro has abided by a self-imposed building moratorium since April 2006 because its WWTP could
not adequately manage high flows during wet weather events. A project funded under the American
Recovery and Reinvestment Act of 2009 to construct flow equalization tanks at the head of the existing
0.75 MGD WWTP allowed the Town to allocate an additional 0.125 MGD wastewater treatment
capacity. However, once this 0.125 MGD allocation is consumed Pittsboro will re -impose the
moratorium until new treatment capacity is added under the project covered by the subject EIS. This
project will allow improvement in the water quality of Robeson Creek and should not degrade the water
quality of the Haw River. Also, the proposed project should not significantly negatively impact either the
water quality or the water supply resource of Jordan Lake.
ENVIRONMENTAL IMPACTS
The EIS has been properly advertised and reviewed by State and Federal agencies. Extensive public input
has been made into the planning process. Comments from agencies and citizens have been incorporated
into the proposed project. All means of avoiding or minimizing environmental and cultural impacts
outlined out in the EIS will be incorporated into the project. Moreover, the project will be designed and
constructed to avoid adverse impacts to topography; soils; wetlands; land use; wetlands; prime or unique
agricultural lands; public lands and scenic, recreational, and state natural areas; areas of archaeological or
historical value; air quality; noise levels; water resources; forest resources; shellfish or fish and their
habitats; and wildlife and natural vegetation. The project will require the following permitting activities:
1. Erosion and Sediment Control Plan.
2. NPDES Discharge Permit.
3. NPDES Stormwater Permit.
4. 404/401 Permitting.
5. Sewer line extension permitting.
6. Authorization to Construct.
7. North Carolina's Department of Transportation or owners of easements will be contacted for
permission to cross property.
8. North Carolina's Board of Contractors will be contacted regarding installation of materials.
9. Department of Commerce -Utilities Commission -Gas Pipeline Safety Division will be contacted
to ensure the project does not disturb its infrastructure.
10. North Carolina's Natural Heritage Program will be consulted to ensure that the project does not
have significant impact on any rare, threatened or endangered species communities, habitats, etc.,
in the proposed project area.
11. Local planning and zoning may require special use permits.
A copy of this Record of Decision will be sent to the Clearinghouse to be sent to all review agencies, and
a notice of its availability will be published in the Environmental Bulletin.