NC0020354_Speculative Limits_20080725

NPDES DOCUMENT SCANNING COVER SHEET
NPDES Permit:
NC0020354
Pittsboro WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
Technical Correction
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
July 25, 2008
This document is printed on reuse paper - ignore any
content on the reirerse side

Michael F. Easley, Govemor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Coleen H. Sullins, Director
Division of Water Quality
July 25, 2008
Mr. William G. Terry
Town of Pittsboro Manager
PO Box 759
Pittsboro, North Carolina 27312
Subject: Town of Pittsboro Speculative Limits
Chatham County
Dear Mr. Terry:
This letter is in response to your request for an initial determination on a proposed discharge of 3.22 MGD of
domestic and industrial wastewater, divided into 0.75 MGD discharging to Robeson Creek, classified as WS-
IV, NSW in the Cape Fear River Basin, and 2.47 MGD discharging to Haw River at the US 64 bridge, classified
WS-IV, NSW also in the Cape Fear River Basin.
The speculative limits presented here are based on our understanding of the proposal and of present
environmental conditions. In providing this information, the Division of Water Quality (DWQ) does not mean
to imply its approval of the proposed discharge. The Division can neither guarantee that it will actually issue
an NPDES permit for the discharge nor that the effluent limitations and other conditions of any permit will be
just as presented here. The Division will make any final decisions on these matters only after it receives and
evaluates a formal permit application for the proposed discharge and considers public comment on the
proposed permit conditions. The Town must also obtain other approvals prior to submitting its permit
application to the Division (see below). •
Environmental Assessments of New and Expanding Treatment Facilities
Please note that the Town must evaluate and address the potential environmental impacts of this project
before receiving approval for an increased discharge through a modified permit.
Anyone proposing to construct new or expanded waste treatment facilities using public funds or public (state)
lands must first prepare an environmental assessment (EA) when wastewater flows (1) equal or exceed 0.5
mgd or (2) exceed one-third of the 7Q10 flow of the receiving stream. The Division will not accept a permit
application for a project requiring an environmental assessment until it has approved the EA and sent a
Finding of No Significant Impact (FONSI) to the State Clearinghouse for review and comment. Further, we
cannot modify or issue the permit until the Clearinghouse has approved the FONSI. If the EA demonstrates
that the project may result in a significant adverse effect on the quality of the environment, you must then
prepare an Environmental Impact Statement. Please contact Ms. Hannah Stallings of DWQ's Planning Section
for further information regarding the requirements of the N.C. Environmental Policy Act. You can reach Ms.
Stallings directly at [phone], or by email at [e-mail]
North Carolina Division of Water Quality 1617 Mail Service Center Raleigh, NC 27699-1617 Phone [phone] Customer Service
Internet: h2o.enr.state.nc.us 512 N. Salisbury St.
Raleigh, NC 27604 FAX [phone]

Town of Pittsboro Speculative Limits
Engineering Alternatives Analysis (EAA)
The Town's EA or EIS must include an approvable engineering alternatives analysis (EAA).
The Division must approve an EAA before issuing or modifying any permit to authorize the discharge of new
or expanding flows. The purpose of the EAA is to justify the proposed wastewater flow rate and provide a
detailed analysis of treatment and disposal alternatives, including a thorough evaluation of non -discharge
and other alternatives such as spray irrigation, water conservation, and inflow and infiltration reduction. In
accordance with the North Carolina General Statutes, the preferred alternative must be the practicable waste
treatment and disposal alternative with the least adverse impact on the environment. Non -discharge and
other alternatives to discharge are considered to be environmentally preferable to a surface water discharge. A
copy of the Division's EAA requirements is attached to this letter. You can find this and other permit -related
information at the NPDES Unit website: http://www.ncwaterQuality.org/NPDES/.
Water Quality Considerations
Robeson Creek is a Class WS-IV, NSW water and was rated as Partially Supporting of freshwater standards in
2000 with chlorophyll a violations and impaired biological communities. The section of Robeson Creek
downstream of the Pittsboro WWTP discharge is listed as impaired on the 2008 Draft 303(d) list for Biological
Criteria. There is a TMDL for Robeson Creek based on chlorophyll a, with a Waste Load Allocation of 146 Kg
(322 lb) Total Phosphorus to the Pittsboro WWTP from April through October.
The Haw River is also a Class WS-IV, NSW water. The Haw River from downstream of Brooks Branch to
downstream of US 64 (4.3 miles) was Fully Supporting in the 2000 basinwide plan and is currently
Supporting aquatic life because of a Good benthic community rating at site BB443. This section of Haw River
is immediately above the Haw River Branch of the B. Everett Jordan Lake, which is impaired for chlorophyll a.
A nutrient TMDL has been developed for the lake. Pittsboro has been given a 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; and for TP are 82% for Robeson Creek and 99% for
the Haw River US 64 site.
The October 2005 Cape Fear River Basinwide Water Quality Plan contains more information and is available
for review or download at htip: / / www.ncwaterquality.org/basinwide/ . Chapters 4 and 5 describe conditions
in Robeson Creek, Haw River, and Jordan reservoir; Chapter 30 includes the localized permitting strategies
for dischargers to waters of concern.
The 2005 Basinwide Plan recommends the following restrictions on oxygen consuming waste from new and
expanding municipal discharges >_1 MGD: BOD5 = 5mg/L, NH3-N = lmg/L.
Nutrients
The nutrient (TN and TP) limits for the facility will be more complex than other limits, because the two
discharges suggested by the Town are subject to both individual and collective requirements. In addition, the
nutrient limits are calculated differently and apply over different time frames.
The Robeson Creek discharge will first be limited according to the 2004 TMDL, which caps the discharge at
322 lb TP for the summer period (April 1 - October 31).
The combined loads of TN and of TP for the combined discharges will also be limited based on the 2007 TMDL
(same as the 2008 Jordan Lake rules). These TN and TP limits will be annual (calendar year) limits and must
be expressed as loads delivered to the lake rather than as loads measured at the discharge points.
The Division's calculations show that the nutrient limits will be stringent at the proposed permitted flows of
0.75 and 2.47 MGD. If the Town treats all wastewater to the same extent prior to discharge (as opposed to
sidestream treatment for a portion of the flow), the TP must be reduced to approximately 0.24 mg/L in the
summer in order to meet the Robeson Creek TMDL. At that concentration, the summer load to Jordan Lake
would be about 1,310 pounds for 3.22 MGD. The Town would then have about 2,420 pounds available for the
winter period and would have to reach 0.63 mg/L TP to meet the annual limit.

Town of Pittsboro Speculative Limits
The facility would also have to reduce TN to 3.0 mg/L on an.annual basis to meet the nitrogen limit at the full
proposed flow.
The Division has already notified the Town that its 2013 permit will include the TP limit for Robeson Creek.
The TP and TN limits from the new Jordan Lake rules are set to become effective in 2010 and 2014,
respectively, if the rules pass the legislative review in early 2009.
The new Jordan Lake rules provide an alternate approach to nutrient reductions that could benefit the Town
and others. Interested dischargers in the Haw River drainage may form a compliance association and work to
meet their nitrogen and phosphorus caps as a group. Members of an association would be subject to their
combined TN and TP limits rather than their individual limits and, as a result, could enjoy some flexibility in
reducing nutrient loads. Note, however, that this option does not apply to the summer TP limit for the
Robeson Creek discharge, which would remain in effect whether or not the Town joined such an association.
Please contact Mike Templeton at [phone] or at [e-mail] if you have any interest in
pursuing this approach.
Speculative Limits. Based on available information, speculative effluent limits for the proposed discharge of
0.75 MGD to Robeson Creek are presented in Table 1.
TABLE 1. Speculative Limits for Town of Pittsboro Outfall 001, discharging to Robeson Creek
EFFLUENT CHARACTERISTICS
EFFLUENT LIMITATIONS
MONTHLY AVERAGE
WEEKLY AVERAGE
DAILY MAXIMUM
FLOW
0.75 MGD
BOD 5 (April 1- October 31)
5.0 mg/L
7.5 mglL
BOD 5 (November 1- March 31)
10.0 mg/L
15 mglL
TSS
30 mg/L
45 mg/L
pH
Not less than 6.0 SU and not greater than 9.0 SU
NH3 as N
(April 1- October 31)
1.0 mg/L
3.0 mg/L
NH3 as N
(November 1- March 31)
2.0. mg/L
6.0 mg/L
.
Dissolved Oxygen
>6.0 mg/L
Fecal Coliform (geometric mean)
200/100 ml
400/100 ml
'
Total Residual Chlorine
17 ug/L 1
Total Phosphorus (TP)
April through October
322 pounds discharged
Chronic Toxicity (90%)
Pass/ Fail Quarterly, months to be determined
Footnotes:
1. The Division shall consider all effluent TRC values reported below 50 ug/L to be in compliance with
the permit. However, the Permittee shall continue to record and submit all values reported by a North
Carolina certified laboratory (including field certified), even if these values fall below 50 ug/L.
Chronic Toxicity. Major municipal discharges are subject to whole effluent toxicity limits. The Town will be
required to pass a quarterly, chronic toxicity test, typically performed at this discharge's instream wastewater
concentrations (IWC) (nominally 90%) and using Ceriodaphnia organisms.

Town of Pittsboro Speculative Limits
Speculative Limits. Based on available information, speculative effluent limits for the proposed discharge of
2.47 MGD to Haw River are presented in Table 2.
TABLE 2. Speculative Limits for Town of Pittsboro Outfall 002, discharging to Haw River at the US 64 bridge
EFFLUENT CHARACTERISTICS
EFFLUENT LIMITATIONS
MONTHLY AVERAGE
WEEKLY AVERAGE
DAILY MAXIMUM
FLOW
2.47 MGD
BOD 5 (April 1- October 31)
5.0 mg/L
7.5 mg/L
BOD 5 (November 1- March 31)
10.0 mg/L
15 mg/L
TSS
30 mg/L
45 mg/L
pH
Not Tess than 6.0 SU and not greater than 9.0 SU
NH3 as N
(April 1- October 31)
1.0 mg/L
3.0 mg/L
NH3 as N
(November 1- March 31)
2.0 mg/L
6.0 mg/L
Dissolved Oxygen
>6.0 mg/L
Fecal Coliform (geometric mean)
200/100 ml
400/100 ml
Total Residual Chlorine
28 ug/L 1
Chronic Toxicity (5.1 %)
Pass/ Fail Quarterly, months to be determined
Footnotes:
1. The Division shall consider all effluent TRC values reported below 50 ug/L to be in compliance with
the permit. However, the Permittee shall continue to record and submit all values reported by a North
Carolina certified laboratory (including field certified), even if these values fall below 50 ug/L.
Chronic Toxicity. Major municipal discharges are subject to whole effluent toxicity limits. The Town will be
required to pass a quarterly, chronic toxicity test, typically performed at this discharge's instream wastewater
concentrations (IWC) (nominally 5.1%) and using Ceriodaphnia organisms.
Speculative Limits. Based on available information, speculative effluent limits for Total Nitrogen and Total
Phosphorus delivered to Jordan Lake are presented in Table 3.
TABLE 3. Speculative Limits for Town of Pittsboro Total Nutrients delivered to Jordan Lake
EFFLUENT CHARACTERISTICS
EFFLUENT LIMITATIONS
Total Nitrogen (TN) pounds per year
27,514 pounds per year delivered 1
Total Phosphorus (TP) pounds per year
3,731 pounds per year delivered 2
Footnotes:
1. Total Nitrogen Transport Factors are 76% for Robeson Creek, and 99% for Haw River discharges.
2. Total Phosphorus Transport Factors are 82% for Robeson Creek and 99% for Haw River discharges.

Town of Pittsboro Speculative Limits
Should you have any questions about these speculative limits or NPDES permitting requirements, please feel
free to contact Jim McKay of my staff at [phone], or by email at [e-mail].
Enclosure: EAA Guidance
cc (w/o enclosure)
Sine ely,
c
Gil Vinzani, P!E., Supervisor
Eastern NPDES Program
Raleigh Regional Office/ Surface Water Protection •
Hannah Stallings. DWQ/ Planning
NPDES files
Central files
Hobbs, Upchurch & Associates, P.A./P.O. Box 1400. Hampstead. NC 28443/ Attn: Morella Sanchez -King

Nutrients
The nutrient (TN and TP) limits for the facility will be more complex than other limits, because the
two discharges suggested by the Town are subject to both individual and collective requirements.
In addition, the nutrient limits are calculated differently and apply over different time frames.
The Robeson Creek discharge will first be limited according to the 2004 TMDL, which caps the
discharge at 322 lb TP for the summer period (April 1 - October 31).
The combined loads of TP and of TN for the combined discharges will also be limited based on
the 2007 TMDL (same as the 2008 Jordan Lake rules). These TN and TP limits will be annual
(calendar year) limits and must be expressed as Toads delivered to the lake rather than as loads
measured at the discharge points.
yhe Di siiv on s oalclations show that the nutrient limits will be stringent at the proposed permitted
flows of 0.75 an 2.74 MGD. If the Town treats all wastewater to the same extent prior to
discharge (as opposed to sidestream treatment for a portion of the flow), the TP must be reduced
to approximately 0.24 mg/L in the summer in order to meet the Robeson Creek TMDL. At that
concentration, the summer load to Jordan Lake would be about 1,310 pounds for 3.22 MGD. The
Town would then have about 2,420 pounds available for the winter period and would have to
reach 0.63 mg/L TP to meet the annual limit.
The facility would also have to reduce TN to 3.0 mg/L on an annual basis to meet the nitrogen
limit at the full proposed flow.
The Division has already notified the Town that its 2013 permit will include the TP limit for
Robeson Creek. The TP and TN limits from the new Jordan Lake rules are set to become
effective in 2010 and 2014, respectively, if the rules pass the legislative review in early 2009.
The new Jordan Lake rules provide an alternate approach to nutrient reductions that could benefit
the Town and others. Interested dischargers in the Haw River drainage may form a compliance
association and work to meet their nitrogen and phosphorus caps as a group. Members of an
association would be subject to their combined TN and TP limits rather than their individual limits
and, as a result, could enjoy some flexibility in reducing nutrient loads. Note, however, that this
option does not apply to the summer TP limit for the Robeson Creek discharge, which would
remain in effect whether or not the Town joined such an association. Please contact Mike
Templeton at [phone] or at [e-mail] if you have any interest in
pursuing this approach.

Pittsboro Spec Limits Nutrient Loading
Data:
TN allocation at Jordan Lake =
TP allocation at Jordan Lake =
WLA for Robeson Creek =
Total WWTP capacity =
Ouffall 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 Ib/ 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:
TN Delivered to Jordan
from Robeson Creek :
Total TN delivered to
Jordan:
TP discharged at 001
April through October:
TP discharged at 001
November through March:
TP Delivered to Jordan
from Robeson Creek:
6,843.52 lb/ year
5,201.07 Ib/ year
TN discharged at 002: 22,537.98 Ib/ year
TN Delivered to Jordan
from Haw River : 22,312.60 Ib/ year
27,513.68 lb/ year Total
TP discharged at 002:
322.00 pounds TP delivered to Jordan
from Haw River.
398.46 pounds
590.78 Ib/ year Total
Total Phosphorus
Delivered to Jordan: 3,731.07 Ib/ year
3,172.01 Ib/ year
3,140.29 Ib/ year

[Fwd: pittsboro]
•
•
Subject: [Fwd: pittsboro]
From: Mike Templeton <[e-mail]>
Date: Mon, 12 Nov 2007 19:58:06 -0400
To: James McKay <[e-mail]>
Jim - FYI - Mike T
Original Message
Subject:pittsboro
Date:Mon, 12 Nov 2007 19:57:39 -0400
From:Mike Templeton <Mike.Templetonnancmail.net>
To:lhall amckimcreed.com
CC:danny.smithRncmail.net, Gil Vinzani <Gil.Vinzani(a7,ncmail.net>
Les -
Here is most of the information I promised to send you regarding Pittsboro's nutrient allocations. I'll be
out of the office most of the week so will follow up on it when I get back in.
First, here are the proposed allocations figures from the Jordan Reservoir nutrient strategy.
TN: 27,514 lb/yr delivered allocation (at the reservoir)
That translates to 36,202 lb/yr discharge allocation at Robeson Creek outfall (76% transport factor) or
27,792 lb/yr at the Haw River near US64 (99% TF)
TP: 3,731 lb/yr delivered allocation
Equivalent to 4,551 lb/yr discharge at Robeson Creek (82% TF), 3,769 lb/yr at the Haw location(99%
TF)
The WLA for the Robeson Creek is given in the TMDL report as a seasonal limit: 146 kg P in the
summer (Apr - Oct, 213 days). That makes it about 1.5 lb/day, or 0.24 mg/L at 0.75 MGD. I'm still
trying to find out if we've decided to implement it as a seasonal limit or a daily. I'll let you know what I
find out.
Regards
- Mike Templeton
Michael E. Templeton, P.E.
Point Source Branch/ NPDES Permits
Surface Water Protection Section
NCDENR• DWQ Raleigh, NC
Tel: [phone] x541
Fax: [phone]
1 of 2 11/13/2007 1:46 PM

[Fwd: pittsboro]
Michael E. Templeton, P.E.
Point Source Branch/ NPDES Permits
Surface Water Protection Section
NCDENR• DWQ Raleigh, NC
Tel: [phone] x541
Fax: [phone]
2 of 2 11/13/2007 1:46 PM

Flow estimate for Haw River at US 64 bridge
Subject: Flow estimate for Haw River at US 64 bridge
From: James Mckay <[e-mail]>
Date: Fri, 06 Jun 2008 16:11:51 -0400
To: John C Weaver <[e-mail]>
Curtis:
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 Engineer
Eastern NPDES Program
NCDWQ
[phone], ext. 595
1 of 1 6/6/2008 4:13 PM

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Southern Pines
I!J Hobbs, Upchurch & Associates, P.A.
Consulting Engineers
Mr. Gil Vinzani, NPDES Eastern
Point Source Branch
NC DENR / DWQ
1617 Mail Service Center
Raleigh, NC 27699-1617
\pri121 th 2008
Program Supervisor
14878 US Hwy 17 • P.O. Box 1400 • Hampstead, NC 28443
E C LS !! V E
APR 2 3 2008
DENR - WATER QUALITY
POINT SOURCE BRANCH
RE: Speculative Limits Update
Project: Town of Pittsboro new WWTP and discharge into Robeson Creek and
the Haw River
Chatham County, NC. DENR # 07-0330; DWQ# 13834
Dear Mr. Vinzani:
We respectfully request updated speculative limits for the proposed Town of
Pittsboro WWTP and its dual discharges into Robeson Creek and the Haw River.
The proposed project includes the construction of a new tertiary wastewater
treatment plant (WWTP) with a permitted capacity of 3.22 MGD to be located
adjacent to the existing Robeson Creek WWTP with effluent discharges into
Robeson Creek and the Haw River at the US-64 bridge. A map with the location of
the WWTP and discharges is enclosed.
We updated the Draft EIS submitted on April 9th, 2007 to reflect the project as
described above. The EIS pursues the approval of a discharge of 3.22 MGD with
the allocation of the discharge flows as follows: (1) continue discharging 0.75 MGD
into Robeson Creek and (2) discharge the balance of the flow (3.22-0.75= 2.47
MGD) into the Haw River at the US-64 bridge. Ms. Hannah Stallings requested
the updated speculative limits before reviewing our updated EIS.
Hampstead, NC • Telephone [phone] • Fax [phone] •
email: [e-mail]
Nags Head Charlotte
Beaufort

Vinzani Speculative Limits Pittsboro WWTP-Robeson Creek and Haw River Discharges 2008 04 21
The new system will include enhanced biological nutrient removal in a single sludge
staged bioreactor to guarantee that the speculative limits and nutrient allocations
associated with the discharge of 3.22 MGD flow are achieved. We are enclosing a
spreadsheet with the calculation of the total nitrogen and phosphorus delivered to
the reservoir from the two proposed discharge locations.
We, therefore, respectfully request that speculative limits (mg/L and mass/year) are
provided for the 3.22 MGD discharge flow and for the two discharge locations: (1)
at Robeson Creek for a flow of 0.75 MGD, (2) at the Haw River- US 64 Hwy for a
flow of 2.47 MGD.
Please contact me for any questions you may have.
Sincerely,
Hobbs, Upchurch & Associates, P.A.
Morella Sanchez -King, Ph.D., P.E.
Division Manager- Hampstead Office
14878 US Hwy 17
Suite 5
Hampstead, NC 28443
Tel: [phone]
Fax: [phone]
Enclosures:
• Spreadsheet of the Town of Pittsboro Wastewater Capacity Alternatives
and Total Nutrients Delivered to the Reservoir.
• Location map of the Town of Pittsboro WWTP Discharges
cc.
William G. Terry, Town of Pittsboro Manager
Hannah Stallings, SEPA Coordinator
Matt Mathews, Point Source Branch Chief
Fred Hobbs, P.E., HUA
Hampstead, NC • Telephone [phone] • Fax [phone] •
email: msanchezk©hobbsupchurch.com
Southern Pines Nags Head Charlotte
Beaufort
Iijj

Vinzani Speculative Limits Pittsboro WWFP-Robeson Creek and Haw River Discharges 2008 04 21
Town of Pittsboro Wastewater Capacity Alternatives and Total Nutrients Delivered to the Reservoir
(Spreadsheet)
TOWN OF PITTSBORO
WASTEWATER CAPACITY ALTERNATIVES
Discharge to Robeson Creek and Haw River
Year -Round Discharge to Robeson Creek
mgd
0.75
Additional Winter Discharge to Robeson Creek
mgd
Days per Year (Winter Months)
155
days
Total Summer Discharge into Robeson Creek
0.75
mgd
Total Winter Discharge into Robeson Creek
0.75
mgd
Nitrogen Poundage from Robeson Creek
5,205
Ibs/year
Phosphorous Poundage from Robeson Creek
468
lbs/year
Year -Round Discharge to Haw River
2.47
mgd
Additional Summer Discharge to Haw River
0.00
mgd
Additional Winter Discharge to Haw River
0.00
mgd
Days per Year (Summer Months)
210
days
Total Summer Discharge into Haw River
2.47
mgd
Total Winter Discharge into Haw River
2.47
mgd
Nitrogen Poundage from Haw River
22,587
lbs/year
Phosphorous Poundage from Haw River
1,882
lbs/year
Total Nitrogen Delivered to Reservoir
27,792
Ibs/year
Nitrogen Limit
27,792
Ibs/year
Total Phosphorous Delivered to Reservoir
2,350
lbs/year
Phosphorous limit delivered to Reservoir
3,731
lbs/year
Reclaimed Water Systems
Other Summer Reclaimed Water
mgd
0.00
Other Winter Reclaimed Water
0.00
mgd
Capacity Summary
Total Summer Capacity
3.22
mgd
Total Winter Capacity
3.22
mgd
Hampstead, NC • Telephone [phone] • Fax [phone] •
email: [e-mail]
Southern Pines Nags Head Charlotte
Beaufort
NJ

079° 08'
0.00" W I
1
1079` 06'10.00" WI
r
8° W
Existing and Proposed (continue)
Discharge into Robeson Creek
Lat: 35° 42' 49"; Long: 79° 10' 14"
i I �
1079' 08' 0.00" WI
Proposed Discharge into the Haw River
- Lat: 35° 43' 51"; Long: 79° 06' 27"
1079" 06' 0.00" WI
o-
Evaluated Alternative Discha
rge into Jordan Lake
Lat: 35° 41' 55"; Long: 79° 04' 60"
Name: PITTSBORO
Date: 12/28/2007
Scale: 1 inch equals 1904 feet
Location: 035° 42' 50.6" N 079° 07 41.2" W
Caption: Pittsboro WWTP and Discharge Locations at Robeson Creek/Haw River and Jordan Lake
Town of Pittsboro WWTP Discharge Locations

EXISTING
wWTP
EXISTING
DISCHARGE
156
PROPOSED GRAVITY
SEWER GALL
PROPOSED
S00 0 0010
s:NE in rt
PROPOSED (PREFERRED) - -
DISCHARGE SITE
35°43'51.72" N
r fr 79°06'26.27" W
- -- PROPOSED EFFLUENT
FORCE MAIN
JORDAN LAKE DISCHARGE
pi
L'9NSLJL+WG ENGINEERS.
SC.•'`IsP. ' PINES. 'NORTfRr .QW- 28387
flt,,4?.14 ►tirr em ma- Pm;
•
35°41'41.46"N
79°05'2.30" W
Hobbs, Upchurch & Associates, P.►4
Figure 1. Town of Pittsboro: Location of the Proposed Wastewater Treatment Plant and Discharge into the Haw River at the US-64 bridge

1 1 1
8° W
079. 08' 0.00" W.
ks•
-.7
"•••5, • •
••• • \
• : 5)1•
- • 4' • ( At- {.--
079 08' 0.00" W
1079° 0610_00" W
I 1 l I•1
\ k .- -
\ J.,-;-• /
' - -
Proposed Discharge into the Haw River
Lat: 35° 43' 51"; Long: 79° 06' 27"
1079* 060_00" W/
Evaluated Alternative Discha
Lat: 35° 41' 55"; Long: 79° 0
rge into Jordan Lake
1' 60"
Name: PITTSBORO
Date: 12/28/2007
Scale: 1 inch equals 1904 feet
Location: 035° 42' 50.6" N 079° OT 41.2" W
Caption: Pittsboro WWTP and Discharge Locations at Robeson Creek/Haw River and Jordan Lake
Town of Pittsboro WWTP Discharge Locations

FAHobbs, Upchurch & Associates, P.A.
Consulting Engineers
14878 US Hwy 17 • P.O. Box 1400 • Hampstead, NC 28443
December 28th 2007
Mr. Matt Matthews, Point Source Branch Chief
Division of Water Quality
1617 Mail Service Center
Raleigh, NC 27699-1617
ti
U
1�
JAN 2 2008
1Fi n !Vh17:
RE: Speculative Limits Update after Meeting on November 29, 2007
Project: Town of Pittsboro new WWTP and discharge into Robeson Creek and
the Haw River
Chatham County, NC. DENR # 07-0330; DWQ# 13834
Dear Mr. Matthews:
Referencing the meeting on November 29, 2007 between the Town of Pittsboro,
DWQ, and members of HUA, the possibility of discharges into Robeson Creek and
the Haw River from the new Town of Pittsboro WWTP was to be determined. On
behalf of the Town of Pittsboro, we respectfully request a written response as your
decision concerning the dual effluent discharge locations as well as their speculative
limits into Robeson Creek and the Haw River.
The proposed project includes the construction of a new tertiary wastewater
treatment plant (WWTP) to be located on Robeson Creek between the existing
WWTP and Hanks Chapel road with the effluent discharges into Robeson Creek
and the Haw River at the US-64 bridge. A map with the location of the WWTP and
discharges is enclosed.
The Pittsboro proposed wastewater treatment plant will be built in two phases:
• Phase 1: to be constructed for an initial demand of 3.22 MGD. An updated
demand analysis indicates that by the year 2013, the Town of Pittsboro will
require a WWTP larger that 3.22 MGD.
• Phase 2: the plant would be expanded after 2013 for the wastewater capacity
required within the 20-year horizon, which we estimate as 6 MGD.
Hampstead, NC • Telephone [phone] • Fax [phone] •
email: [e-mail]
Southern Pines Nags Head Charlotte
Beaufort

Matthews Speculative Limits Pittsboro WV TP-Robeson Creek and Haw River Discharges 2007 12 28
We will update the Draft EIS submitted on April 9th, 2007 to reflect the changes
indicated above. The EIS pursues the approval of a discharge of 3.22 MGD for
Phase I of the project with the allocation of the discharge flows as follows: (1)
continue discharging 0.75 MGD into Robeson Creek and (2) discharge the balance
of the flow (3.22-0.75= 2.47 MGD) into the Haw River at the US-64 bridge.
The new system will include enhanced biological nutrient removal in a single sludge
staged bioreactor to guarantee that the speculative limits and nutrient allocations
associated with the discharge of 3.22 MGD flow are achieved. We are enclosing a
spreadsheet with the calculation of the total nitrogen and phosphorus delivered to
the reservoir from the two proposed discharge locations.
For the preparation of the EIS, we analyzed the alternative of discharging into
Jordan Lake; this alternative was discarded for considering that discharging into the
Haw River causes less impact, both from the environment and from an economy
stand point.
Nevertheless, we respectfully request that speculative limits (mg/L and mass/year)
are provided for the 3.22 MGD discharge flow and for the three discharge
locations: (1) the existing, at Robeson Creek for a flow of 0.75 MGD, (2) the
preferred alternative, at the Haw River- US 64 Hwy for a flow of 2.47 MGD and (3)
at Jordan Lake for a flow of 2.47 MGD.
Please contact me for any questions you may have.
Sincerely,
Hobbs, Upchurch & Associates, P.A.
Morella Sanchez -King, Ph.D., P.E.
Division Manager- Hampstead Office
14878 US Hwy 17
Suite 5
Hampstead, NC 28443
Tel: [phone]
Fax: [phone]
Hampstead, NC • Telephone [phone] • Fax [phone] •
email: [e-mail]
Southern Pines Nags Head Charlotte
NJ
Beaufort

Southern Pines
NJ
Matthews Speculative Limits Pittsboro VC/MP-Robeson Creek and Haw River Discharges 2007 12 28
Enclosures:
• Spreadsheet of the Town of Pittsboro Wastewater Capacity Alternatives
and Total Nutrients Delivered to the Reservoir.
• Location map of the Town of Pittsboro WWTP Discharges
cc.
William G. Terry, Town of Pittsboro Manager
Hannah Stallings, SEPA Coordinator
Mike Templeton, P.E. Central Office Point Source Branch
Fred Hobbs, P.E., HUA
Town of Pittsboro Wastewater Capacity Alternatives and Total Nutrients Delivered to the Reservoir
(Spreadsheet)
TOWN OF PITTSBORO
WASTEWATER CAPACITY ALTERNATIVES
Discharge to Robeson Creek and Haw River
mgd
Year -Round Discharge to Robeson Creek
0.75
Additional Winter Discharge to Robeson Creek
mgd
Days per Year (Winter Months)
155
days
Total Summer Discharge into Robeson Creek
0.75
mgd
Total Winter Discharge into Robeson Creek
0.75
mgd
Nitrogen Poundage from Robeson Creek
5,205
lbs/year
Phosphorous Poundage from Robeson Creek
468
lbs/year
Year -Round Discharge to Haw River
2.47
mgd
Additional Summer Discharge to Haw River
0.00
mgd
Additional Winter Discharge to Haw River
0.00
mgd
Days per Year (Summer Months)
210
days
Total Summer Discharge into Haw River
2.47
mgd
Total Winter Discharge into Haw River
2.47
mgd
Nitrogen Poundage from Haw River
22,587
lbs/year
Phosphorous Poundage from Haw River
1,882
lbs/year
Total Nitrogen Delivered to Reservoir
27,792
lbs/year
Nitrogen Limit
27,792
lbs/year
Total Phosphorous Delivered to Reservoir
2,350
lbs/year
Phosphorous limit delivered to Reservoir
3,731
lbs/year
Reclaimed Water Systems
Other Summer Reclaimed Water
0.00
mgd
Other Winter Reclaimed Water
0.00
mgd
Capacity Summary
Total Summer Capacity
3.22
mgd
Total Winter Capacity
3.22
mgd
Hampstead, NC • Telephone [phone] • Fax [phone] •
email: [e-mail]
Nags Head Charlotte
Beaufort

IJ Hobbs, Upchurch & Associates, P.A.
Consulting Engineers
14878 US Hwy 17 • P.O. Box 1400 • Hampstead, NC 28443
December 28th 2007
Mr. Matt Matthews, Point Source Branch Chief
Division of Water Quality
1617 Mail Service Center
Raleigh, NC 27699-1617
RE: Speculative Limits Update after Meeting on November 29, 2007
Project: Town of Pittsboro new WWTP and discharge into Robeson Creek and
the Haw River
Chatham County, NC. DENR # 07-0330; DWQ# 13834
Dear Mr. Matthews:
Referencing the meeting on November 29, 2007 between the Town of Pittsboro,
DWQ, and members of HUA, the possibility of discharges into Robeson Creek and
the Haw River from the new Town of Pittsboro WWTP was to be determined. On
behalf of the Town of Pittsboro, we respectfully request a written response as your
decision concerning the dual effluent discharge locations as well as their speculative
limits into Robeson Creek and the Haw River.
The proposed project includes the construction of a new tertiary wastewater
treatment plant (WWTP) to be located on Robeson Creek between the existing
WWTP and Hanks Chapel road with the effluent discharges into Robeson Creek
and the Haw River at the US-64 bridge. A map with the location of the WWTP and
discharges is enclosed.
The Pittsboro proposed wastewater treatment plant will be built in two phases:
• Phase 1: to be constructed for an initial demand of 3.22 MGD. An updated
demand analysis indicates that by the year 2013, the Town of Pittsboro will
require a WWTP larger that 3.22 MGD.
• Phase 2: the plant would be expanded after 2013 for the wastewater capacity
required within the 20-year horizon, which we estimate as 6 MGD.
Hampstead, NC • Telephone [phone] • Fax [phone] •
email: [e-mail]
Southern Pines Nags Head Charlotte
Beaufort

Matthews Speculative Limits Pittsboro W WTp-Robeson Creek and Haw River Discharges 200712 28
We will update the Draft EIS submitted on April 9th, 2007 to reflect the changes
indicated above. The EIS pursues the approval of a discharge of 3.22 MGD for
Phase I of the project with the allocation of the discharge flows as follows: (1)
continue discharging 0.75 MGD into Robeson Creek and (2) discharge the balance
of the flow (3.22-0.75= 2.47 MGD) into the Haw River at the US-64 bridge.
The new system will include enhanced biological nutrient removal in a single sludge
staged bioreactor to guarantee that the speculative limits and nutrient allocations
associated with the discharge of 3.22 MGD flow are achieved. We are enclosing a
spreadsheet with the calculation of the total nitrogen and phosphorus delivered to
the reservoir from the two proposed discharge locations.
For the preparation of the EIS, we analyzed the alternative of discharging into
Jordan Lake; this alternative was discarded for considering that discharging into the
Haw River causes less impact, both from the environment and from an economy
stand point.
Nevertheless, we respectfully request that speculative limits (mg/L and mass/year)
are provided for the 3.22 MGD discharge flow and for the three discharge
locations: (1) the existing, at Robeson Creek for a flow of 0.75 MGD, (2) the
preferred alternative, at the Haw River- US 64 Hwy for a flow of 2.47 MGD and (3)
at Jordan Lake for a flow of 2.47 MGD.
Please contact me for any questions you may have.
Sincerely,
Hobbs Upchurch & Associates, P.A.
•
Morella Sanchez -King, Ph.D., P.E.
Division Manager- Hampstead Office
14878 US Hwy 17
Suite 5
Hampstead, NC 28443
Tel: [phone]
Fax: [phone]
Hampstead, NC • Telephone [phone] • Fax [phone] •
email: [e-mail]
Southern Pines Nags Head Charlotte
Beaufort
NJ

Matthews Speculative Limits Pittsboro WWTP-Robeson Creek and Haw River Discharges 200712 28
Southern Pines
Enclosures:
• Spreadsheet of the Town of Pittsboro Wastewater Capacity Alternatives
and Total Nutrients Delivered to the Reservoir.
• Location map of the Town of Pittsboro WWI'P Discharges
cc.
William G. Terry, Town of Pittsboro Manager
Hannah Stallings, SEPA Coordinator
Mike Templeton, P.E. Central Office Point Source Branch
Fred Hobbs, P.E., HUA
Town of Pittsboro Wastewater Capacity Alternatives and Total Nutrients Delivered to the Reservoir
(Spreadsheet)
TOWN OF PITTSBORO
WASTEWATER CAPACITY ALTERNATIVES
Discharge to Robeson Creek and Haw River
Year -Round Discharge to Robeson Creek
mgd
0.75
Additional Winter Discharge to Robeson Creek
mgd
Days per Year (Winter Months)
155
days
Total Summer Discharge into Robeson Creek
0.75
mgd
Total Winter Discharge into Robeson Creek
0.75
mgd
Nitrogen Poundage from Robeson Creek
5,205
lbs/year
Phosphorous Poundage from Robeson Creek
408
lbs/year
Year -Round Discharge to Haw River
2.47
mgd
Additional Summer Discharge to Haw River
+).n,:i
mgd
Additional Winter Discharge to Haw River
!0 )
mgd
Days per Year (Summer Months)
210
days
Total Summer Discharge into Haw River
2A7
mgd
Total Winter Discharge into Haw River
2A7
mgd
Nitrogen Poundage from Haw River
22,587
lbs/year
Phosphorous Poundage from Haw River
1,882
lbs/year
Total Nitrogen Delivered to Reservoir
27,792
lbs/year
Nitrogen Limit
27,792
lbs/year
Total Phosphorous Delivered to Reservoir
2,350
lbs/year
Phosphorous limit delivered to Reservoir
3,731
lbs/year
Reclaimed Water Systems
Other Summer Reclaimed Water
mgd
0.00
Other Winter Reclaimed Water
0.00
mgd
Capacity Summary
Total Summer Capacity
mgd
3.22
Total Winter Capacity
3.22
mgd
Hampstead, NC • Telephone [phone] • Fax [phone] •
email: [e-mail]
Nags Head Charlotte
Beaufort
Iw

[Fwd: [Fwd: Re: Pittsboro meeting, Wednesday at 10:00]]
Subject: [Fwd: [Fwd: Re: Pittsboro meeting, Wednesday at 10:00]]
From: Gil Vinzani <[e-mail]>
Date: Wed, 28 Nov 2007 08:49:28 -0500
To: james Mckay <[e-mail]>
Subject: [Fwd: Re: Pittsboro meeting, Wednesday at 10:00]
From: Hannah Stallings <[e-mail]>
Date: Tue, 27 Nov 2007 16:17:37 -0500
To: Gil Vinzani <[e-mail]>
Original Message
Subject: Re: Pittsboro meeting, Wednesday at 10:00
Date: Mon, 26 Nov 2007 15:41:18 -0500
From: Matt Matthews <matt.matthews®ncmail.net>
Organization: NC Division of Water Quality
To: [e-mail], Mike Templeton <[e-mail]>,
[e-mail], [e-mail], Kathy Stecker
<[e-mail]>
References:<[e-mail]>
Hannah,
I apologize for not being able to do this on Thursday.
Everyone,
Dina has reserved the room beginning at 9:00 AM,
time, if everyone is available.
Please let me know.
Matt
Adam Kiker wrote:
Mr. Matthews —
Paul was not available.
so we can do the pre -meeting at that
Vance Brooks with our office spoke with you this morning and confirmed a meeting
for Wednesday morning, 11/28/07 at 10:00 to discuss several wastewater discharge
options facing the Town of Pittsboro. To my knowledge, a location for the meeting
has not been determined yet, but we would assume the Archdale Building.
I will leave it up to you to decide who is in attendance. The topic of
conversation will focus on. Pittsboro's ability to most efficiently utilize its
nutrient allocation into Jordan Reservoir using the Haw River and Roberson Creek
as discharge locations. We would also like to discuss the status of the EIS and
how the various possibilities need to be folded into the revised document.
Present from our side will be Fred Hobbs, Vance Brooks, Morella Sanchez -King, and
myself with HUA; and Bill Terry (manager) and David Monroe (planner) with the
Town.
Please let me know as soon as you nail down a location so I can let everyone know.
1 of 2 11/28/2007 8:54 AM

[Fwd: [Fwd: Re: Pittsboro meeting, Wednesday at 10:00]]
Thanks for your time,
Adam
**ADAM P. KIKER, E.I.**
*/Hobbs/**/, Upchurch & Associates/*
*300 SW Broad Street*
*Southern Pines, NC 28388*
*Phone: [phone]*
*Fax: [phone]*
*Cell: [phone]*
*[e-mail]<mailto:[e-mail]>*
Matt Matthews
NC DENR/Division of Water Quality
Point Source Branch
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
v-[phone], ext. 517
f-[phone]
[e-mail]
http://h2o.enr.state.nc.us/swps/
Hannah Stallings
SEPA Coordinator
DWQ - Planning Section
1617 Mail Service Center
Raleigh, NC 27699-1617
p [phone], ext. 555 f [phone]
Gil Vinzani <Gil.vinzaniPncmail.net>
Supervisor, Eastern NPDES Program
NC Division of Water Quality
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[Fwd: pittsboro]
Subject: [Fwd: pittsboro]
From: Mike Templeton <[e-mail]>
Date: Mon, 12 Nov 2007 19:58:06 -0400
To: James McKay <[e-mail]>
Jim - FYI - Mike T
Original Message
Subject:pittsboro
Date:Mon, 12 Nov 2007 19:57:39 -0400
From:Mike Templeton <[e-mail]>
To:lhallRmckimcreed.com
CC:danny.smith(aincmail.net, Gil Vinzani <Gi1.Vinzanina,ncmail.net>
Les -
Here is most of the information I promised to send you regarding Pittsboro's nutrient allocations. I'll be
out of the office most of the week so will follow up on it when I get back in.
First, here are the proposed allocations figures from the Jordan Reservoir nutrient strategy.
TN: 27,514 lb/yr delivered allocation (at the reservoir)
That translates to 36,202 lb/yr discharge allocation at Robeson Creek outfall (76% transport factor) or
27,792 lb/yr at the Haw River near US64 (99% TF)
TP: 3,731 lb/yr delivered allocation
Equivalent to 4,551 lb/yr discharge at Robeson Creek (82% TF), 3,769 lb/yr at the Haw location(99%
TF)
The WLA for the Robeson Creek is given in the TMDL report as a seasonal limit: 146 kg P in the
summer (Apr - Oct, 213 days). That makes it about 1.51b/day, or 0.24 mg/L at 0.75 MGD. I'm still
trying to find out if we've decided to implement it as a seasonal limit or a daily. I'll let you know what I
find out.
Regards
- Mike Templeton
Michael E. Templeton, P.E.
Point Source Branch/ NPDES Permits
Surface Water Protection Section
NCDENR• DWQ Raleigh, NC
Tel: [phone] x541
Fax: [phone]
1 of 2 11/13/2007 8:28 AM

[Fwd: pittsboro]
Michael E. Templeton, P.E.
Point Source Branch/ NPDES Permits
Surface Water Protection Section
NCDENR• DWQ Raleigh, NC
Tel: [phone] x541
Fax: [phone]
2 of 2 11/13/2007 8:28 AM

spec limits meeting
Subject: spec limits meeting
From: Mike Templeton <[e-mail]>
Date: Mon, 12 Nov 2007 12:38:57 -0400
To: James McKay <[e-mail]>, Bob Sledge <[e-mail]>, Teresa
Rodriguez <[e-mail]>, [e-mail]"' <[e-mail]>,
Peter Caldwell <[e-mail]>
CC: Gil Vinzani <[e-mail]>
Hello, again -
To repeat the message most of you got from Calendar: I'm proposing a 1-hour meeting
this Thursday, the 15th, 3-4pm, in the NPDES file room. And you're invited.
The purpose of the meeting is to discuss the spec limits requests from Chatham County
(19 MGD to the Cape Fear below Buckhorn Dam; assigned to me) and from Pittsboro (2-3
MGD(?) and 4 MGD to Robeson Creek and the Haw River; went to Jim). There is also the
related issue of a proposed 6,000-acre development between Pittsboro and the Haw
River, and we'll discuss that, too. The aim is to review the available information
and consider how to respond to these requests while keeping the larger issues of the
Upper Cape Fear and Jordan watersheds in mind. We need to respond fairly quickly,
say, by the end of the month.
I hope each of you can make it so we can sort through the issues and outline what Jim
and I will write up. Here are some of the info items we need to cover:
- previous spec limits for Pittsboro (Jim, there are at least two - 2000 & 2004 -
and they should be in the permit file)
- the status of Pittsboro's expansion/ relocation plans and their draft EIS (me +
others)
- the proposed 6,000-acre development and its implications (mine again)
- the requirements from the Robeson Creek TMDL - what we've told Pittsboro to
expect, what limits they'll have in 2011 (Bob?)
- Western Wake - the overall plans and timeline, spec limits we've given them (in
particular, for nutrients), how they might affect or be affected by another discharge
below the dam (Teresa? Pete?)
- nutrient issues below Buckhorn Dam, and DWQ's position about future nutrient
limits in the Middle Cape Fear or beyond (Pete, I know we've talked about this, but I
need a refresher course)
- a good map or maps (Jim, Pete, anybody?) - I have some small ones but am
thinking of a good-sized basin map to work with.
If any of you can't be there, I need to talk to you 1st thing Thursday morning or get
this info from you somehow (I'll be in Asheville Tue & Wed and in meetings Thu from
10 til 3).
Jackie - I'm inviting you because we're meeting beforehand about the Stantonsburg
spec limits and because of your wisdom and experience with such things. Join in if
you have time, bolt if you need to.
Thanks much.
- Mike T
1 of 1 11/13/2007 8:26 AA

about:blank
Thank you Curtis. You are right, I took the coordinates supplied by a consultant and did not check
them. When I entered the coordinates on Terrain Navigator Pro, they do pop up in the lake. The actual
proposed discharge site is right at the US 64 bridge. I read 35-43-49 N & 79-06-27 W .
Jim McKay
John C Weaver wrote:
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
7Q10 = 71.8 cfs (equivalent to 0.056 cfsm)
30Q2 = 159 cfs (equivalent 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.
1 of 2 6/10/2008 2:30 PM

about:blank
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] Fax: [phone]
E-mail address -- [e-mail]
Internet address -- http:llnc.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 Engineer
Eastern NPDES Program
NCDWQ
[phone], ext. 595
2 of 2 6/10/2008 2:30 PM

adj.ustmerits to projected pittsboro limits
e
Subject: adjustments to projected pittsboro limits
From: Mike Templeton <[e-mail]>
Date: Tue, 30 Oct 2007 19:02:02 -0400
To: Adam Kiker <[e-mail]>
CC: Moreila Sanchez -King <[e-mail]>, Barry King <[e-mail]>
Adam -
Here is the follow-up I promised you in our phone call this afternoon. Let me know if you have any questions about
this or anything else we discussed.
As I mentioned on the phone, the 4 MGD flow figure we've been using for the Town of Pittsboro is probably too
high. We got the figure from some quick calculations we did in a meeting a year or so ago. As you recalled, it
represents the highest flow Pittsoboro could discharge and still meet its proposed nitrogen limit; that is, the mass
limit is equivalent to 3.0 mg/L (BAT) at about 4 MGD. What we didn't consider then was the fact that relocating the
outfall from Robeson Creek to the Haw River changes the nutrient transport factors, and that in tum will lower the
Town's nutrient discharge limits.
First, these are the figures I emailed you on 2/22/07, showing the allocations for the present outfall location on
Robeson Creek:
TN: 36,202 lb/yr discharge allocation (equivalent to 5.29 mg/L)
27,514 lb/yr delivered to the reservoir (76% of discharge load)
TP: 4,551 lb/yr discharge (equivalent to 0.66 mglL)
3,731 lb/yr delivered (82% of discharge)
To calculate the discharge allocations/ limits, we start with the delivered allocations for N & P, which are based on
the TMDL. We use the transport factors to calculate the corresponding discharge allocations (and limits).
Discharge TN = Delivered TN / TF
The delivered allocations are fixed and -do not change when the outfall is moved. But the TFs for the new location
are higher - 99% for both N & P - than at the current location, because the discharge is much closer to the lake. The
result is that the discharge limits decrease to about 27,800 and 3,770 lb/yr for N & P.
If we still assume 3.0 mg/L is BAT for nitrogen removal, the allowable flow is now about 3 MGD.
I should be around all week in case you have any other questions.
- Mike Templeton
of 1

Ilj
Hobbs, Upchurch & Associates, P.A.
Consulting Engineers
14878 US Hwy 17 • P.O. Box 1400 • Hampstead, NC 28443
October 23nd. 2007
Mr. Matt Matthews, Point Source Branch Chief
NPDES Permitting Unit
Division of Water Quality
1617 Mail Service Center
Raleigh, NC 27699-1617
OCT 2 4 2007 J'
DENR - WATER DUALITY
POINT SOURCE BRANCH
RE: Speculative Limits Request
Project: Town of Pittsboro new WWTP and discharge into the Haw River
Chatham County, NC. DENR # 07-0330; DWQ# 13834
Dear Mr. Matthews:
On behalf of the Town of Pittsboro, we are requesting an updates of the Speculative
Limits for the discharge of the proposed (new) Pittsboro WWTP.
The project includes: the construction of a new tertiary wastewater treatment plant
(WWTP), to be located on Robeson Creek between the existing WWTP and Hanks
Chapel road, with a new effluent discharge force main to the Haw River at the US-
64 bridge. A gravity sewer outfall shall be constructed along Robeson Creek
between the existing plant and the new plant to transport the sewer to the proposed
new facility.
The Pittsboro proposed wastewater treatment plant will be built in two phases:
• Phase 1: to be constructed for an initial demand of 3.0 MGD. An updated
demand analysis indicates that by the year 2013, the Town of Pittsboro will
require a WWTP larger that 3.0 MGD.
• Phase 2: the plant would be expanded after 2013 for a capacity of 4.0 MGD.
In September 2004, we received a letter from DWQ signed by Mr. David A. Goodrich indicating the
speculative limits for a 4-MGD flow at three potential discharge sites: Haw River below US 15-501,
Mainstream of Jordan Lake above Stinking Creek, and Haw River near Highway 64.
Hampstead, NC • Telephone [phone] • Fax [phone] •
email: [e-mail]
Southern Pines Nags Head Charlotte
Beaufort

Matthews Speculative Limits Pittsboro WWTP-Haw River Discharge 2007 10 23
We are updating the Draft EIS submitted on April 9th, 2007 to reflect the changes
indicated above. The EIS pursues the approval of a discharge of 4.0 MGD.
The new system will include enhanced biological nutrient removal in a single sludge
staged bioreactor to guarantee that the speculative limits and nutrient allocations
associated with the 3.0 and 4.0 MGD flows are achieved.
The existing WWTP discharges into Robeson Creek, which is listed in the 303 (d)
impaired water list. The new project proposes to stop discharging into Robeson
Creek and investigates the feasibility of two other potential discharge sites: in the
Haw River at the US-64 bridge and in Jordan Lake. Discharging in the Haw River at
US 64 is the preferred alternative. A map with the location of the proposed facility
and discharge routes is enclosed.
We request that speculative limits (mg/L and mass/year) are provided for the 3.0
and 4.0 MGD discharge flows and -for comparison purposes- for the three
discharge locations: (1) the existing, at Robeson Creek, (2) the preferred alternative,
at the Haw River- US 64 Hwy and (3) at Jordan Lake.
Please contact me for any questions you may have.
Sincerely,
Hobbs, Upchurch & Associates, P.A.
Morella Sanchez -King, Ph.D., P.E.
Division Manager- Hampstead Office
14878 US Hwy 17
Suite 5
Hampstead, NC 28443
Tel: [phone]
Fax: [phone]
Enclosure: Town of Pittsboro WWTP and Discharge Routes. Location Map
cc.
William G. Terry, Town of Pittsboro Manager
Hannah Stallings, SEPA Coordinator
Mike Templeton, P.E. Central Office Point Source Branch
Hampstead, NC • Telephone [phone] • Fax [phone] •
email: [e-mail]
Southern Pines Nags Head Charlotte
Beaufort
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{ \ Existing Discharge into Robeson Creek
Lat: 35° 42' 49"; Long: 79° 10' 14"
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Name: PITTSBORO
Date 12,28,2007
Scala: 1 inch equals 1904 feet
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Proposed Discharge into the liars Ris cr
Lat. 35° 41' ;I"• Long: 79° 06' 27"
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Evaluated Alternative Di Lh: rge into Jordan Lake
Lat: 35° 41' 55"; Long: 79° 04' 60"
1o,5 lye 0 00°
Locaton: 035' 4Z 50.6' N 079. 07' 41.2" W
Captors: Rasboro WWTP and Discharge Locatl0s at Robeson Creek!H0w Rner and Jordan Lake
Town of Pittsboro WWTP Discharge Locations
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