NC0043257_Permit Issuance_20041025

Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E. Director
Division of Water Quality
YE; -J011...:;; r .1i" v,,.; . October 25, 2004
Mr. Matthew Raynor
Nature Trail Associates
10006 Hammock Bend Rd.
Chapel Hill, North Carolina 27517
Subject: Issuance of NPDES, Permit
Permit No. NCO043257
Nature Trails MHP vVWTP
Chatham County
Dear Mr. Raynor:
Division personnel have reviewed and approved your application for renewal of the subject
permit. Accordingly, we are forwarding the attached NPDES discharge permit. This permit 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 May 9, 1994
(or as subsequently amended).
The following modifications to the draft permit are included in the final permit:
• The correct limits for Total Nitrogen and Total Phosphorus are 669 lb/yr and 243 lbs/yr,
respectively.
• The limits for daily maximum and weekly average for ammonia and daily maximum for
Total Residual Chlorine are also applicable to the Effluent and Limitations Requirements
for the existing flow of 0.04 MGD. The permit includes an 18 months compliance schedule
for the total residual chlorine limit. This limit will not apply if a UV disinfection system is
in operation at the end of the compliance schedule. If the proposed expansion, which
includes a UV disinfection system, is underway but not completed at the end of the
compliance schedule the permittee may request a modification to the permit to extend the
compliance schedule.
If any parts, measurement frequencies or sampling requirements contained in this permit are
unacceptable to you, you have the right to an adjudicatory hearing upon written request within thirty
(30) days following receipt of this letter. This request must be in the form of a written petition,
conforming to Chapter 150B of the North Carolina General Statutes, and filed with the Office of
Administrative Hearings (6714 Mail Service Center, Raleigh, North Carolina 27699-6714). Unless
such demand is made, this decision shall be final and binding.
Please note that this permit is not transferable except after notice to the Division. The Division
may require modification or revocation and reissuance of the permit. This permit does not affect the
legal requirements to obtain other permits which may be required by the Division of Water Quality or
permits required by the Division of Land Resources, the Coastal Area Management Act or any other
Federal or Local governmental permit that may be required.
North Carolina Division of Water Quality 1617 Mail Service Center Raleigh, NC 27699-1617 Phone [phone]
Internet h2o.ennstate.nc.us 512 N. Salisbury St. Raleigh, NC 27604 FAX [phone]
An Equal Opportunity/Affirmative Action Employer —50% Recycled/10% Post Consumer Paper
one
Np Caina
rowon/ltf
Customer Service
1-877-623-6748

Mr. Raynor
Nature Trail MHP WWTP
Page 2
If you have any questions concerning this permit, please contact Teresa Rodriguez at telephone
number [phone], extension 553.
Sincerely,
ORIGINAL SIGNED BY
Mark McIntire
Alan W. Klimek, P.E.
cc: Central Files
Raleigh Regional Office
NPDES Unit Files

4f
Permit NCO043257
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
PERMIT
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
Nature Trails Associates
is hereby authorized to discharge wastewater from a facility located at the
Nature Trails Associates MHP WWTP
off NCSR 1008
Chapel Hill
Chatham County
to receiving waters designated as Cub Creek in the Cape Fear River Basin
in accordance with effluent limitations, monitoring requirements, and other conditions set
forth in Parts I, II, III and IV hereof.
This permit shall become effective December 1, 2004.
This permit and authorization to discharge shall expire at midnight on April 30, 2006.
Signed this day October 25, 2004.
ORIGINAL SIGNED BY
Mark McIntire
Alan W. Klimek, P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission

Permit NC0043257
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby revoked.
As of this permit issuance, any previously issued permit bearing this number is no longer effective.
Therefore, the exclusive authority to Qperate and discharge from this facility arises under the permit
conditions, requirements, terms, and provisions included herein.
Nature Trails Associates, is hereby authorized to:
1. Continue to operate an existing 0.04 MGD wastewater treatment facility with the
following components:
♦ Influent pump station
♦ Equalization basin
♦ Flow splitter box
♦ Aeration basins
♦ Dual clarifiers
♦ Aerobic sludge digesters
♦ Tertiary sand filters
♦ Effluent chlorination
♦ Flow monitoring
and located off NCSR 1008 at the Nature Trails Associates MHP WWTP in Chatham
County; and
2. Upon receiving an Authorization to Construct from the Division, construct and operate
facilities for a design capacity of 0.060 MGD, and
3. Discharge from said treatment works at the location specified on the attached map into
Cub Creek, classified WS-IV NSW waters in the Cape Fear River Basin.

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Permit NC0043257
A. (1.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
During the period beginning on the effective date of this permit and lasting until expansion above
0.04 MGD or expiration, the Permittee is authorized to discharge from outfall 001. Such discharges
shall be limited and monitored by the Permittee as specified below:
EFFLUENT
CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Daily
Maximum
Measurement
Frequent
Sample Type
Sample Locations
Flow
0.04 MGD
Continuous
Recording
Influent or Effluent
BOD, 5-day (20°C)
17.0 mg/L
25.5 mg/L,
Weekly
Composite
Effluent
Total Suspended Residue
30.0 mg/L
45.0 mg/L
Weekly
Composite
Effluent
NH3 as N
(April 1 - October 31)
2.0 mg/L
10.0 mg/L
Weekly
Composite
Effluent
NH3 as N
(November 1-March 31)
5.0 mg/L
25.0 mg/L
Weekly
Composite
Effluent
Dissolved Oxygen2
Weekly
Grab
Effluent,
Upstream & Downstream
Fecal Coliform
(geometric mean)
200 / 100 mL
400/100 mL
Weekly
Grab
Effluent
Total Residual Chlorine3
28 Ng/L
21Week
Grab
Effluent
Temperature CC)
Daily
Grab
Effluent
Temperature CC)
Weekly
Grab
Upstream & Downstream
Total Nitrogen
(NO2-N+NO3-N+TKN)
Quartedy
Composite
Effluent
Total Phosphorus
Quarterly
Composite
Effluent
pH4
Weekly
Grab
Effluent
Footnotes:
1. Upstream - at least 50 feet upstream from the outfall. Downstream - at least 1.2 miles
downstream from the outfall.
2. The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/L.
3. Effluent monitoring and limitation only apply if chlorine or a chlorine derivative is added to the
waste stream during treatment. See Condition A.(5.)
4. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

Permit NC0043257
A. (2.) EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (0.06 MGD)
Beginning upon expansion above 0.04 MGD and lasting until expiration, the Permittee is authorized
to discharge treated wastewater from outfall 001. Such discharges shall be limited and monitored by
the Permittee as specified below:
EFFLUENT
CHARACTERISTICS
LIMITS
MONITORING REQUIREMENTS
Monthly
Average
Daily
Maximum
Measurement
Frequency ,
Sample Type
Sample Locationi
Flow
0.06 MGD
Continuous
Recording
Influent or Effluent
BOD, 5-day (20°C)
10.0 mg/L
15.0 mg/L
Weekly
Composite
Effluent
Total Suspended Residue
30.0 mg/L
45.0 mg/L
Weekly
Composite
Effluent
NH3
(April 1- October 31)
2.0 mg/L
10.0 mg/L
Weekly
Composite
Effluent
NH3 as N
(November 1 - March 31)
5.0 mg/L
25.0 mg/L
Weekly
Composite
Effluent
Dissolved Oxygen2
Weekly
Grab
Effluent,
Upstream & Downstream
Fecal Coliform
(geometric mean)
2001100 mL
400 / 100 mL
Weekly
Grab
Effluent
Total Residual Chlodne3
28 uglL
21Week
Grab
Effluent
Temperature (°C)
Daily
Grab
Effluent
Temperature (°C)
Weekly
Grab
Upstream & Downstream
Total Nitmgen4
(NOrN+NO3-N+TKN)
669lbs/yr
Month
Composite
Effluent
Total Phosphorus4
243 Ibs/yr
21Month
Composite
Effluent
pHs
I
Weekly
Grab
Effluent
Footnotes:
1. Upstream - at least 50 feet upstream from the outfall. Downstream - at least 1.2 miles
downstream from the outfall.
2. The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/L.
3. Effluent monitoring and limitation only apply if chlorine or a chlorine derivative is added to the
waste stream during treatment. See Condition A.(5.)
4. See condition A. (3.)
5. The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

Permit NCO043257
A. (3.) CALCULATION OF TOTAL NITROGE AND TOTAL PHOSPHORUS LOADS
a. The Permittee shall calculate monthly and annual TN and TP Loads as follows:
L Monthly TN (or TP) Load (lb/mo) = 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
H. Annual TN (or TP) Load (lb/yr) = Sum of the 12 Monthly TN (or TP) Loads for the
calendar year
b. The Permittee shall report monthly Total Nitrogen or Total Phosphorus results (mg/ L and
lb/mo) in the discharge monitoring report for that month and shall report each year's annual
results (lb/yr) in the December report for that year.
A. (4.) ADDITIONAL NUTRIENT CONTROLS
Upon formal approval of a nutrient management strategy, TMDL, or similar control measures
affecting these receiving waters, the Division may re -open or, alternately, revoke and re -issue this
permit to incorporate nutrient control requirements consistent with the approved measure(s). The
Division shall notify the Permittee in writing of its intent to initiate any such action and shall allow
for public comment and due process consistent with state and federal requirements.
A. (5.) TOTAL RESIDUAL CHLORINE
The limit for total residual chlorine sl
disinfection system but no later than
chlorination/ dechlorination is used, i
ive upon com
�u✓�e I, zoo6
Dn of the installation of a
If a method different than
not be applicable.

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
Kerr T. Stevens, Director
October 15, 2004
j&J7�1�
�
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
MEMORANDUM
To: Michael Douglas
NC DENR / DEH / Regional Engineer
Raleigh Regional Office %
From: Teresa Rodriguez
NPDES Unit
Subject: Review of Draft NPDES Permit NC0043257
Nature Trails WWI P
Chatham County
Please indicate below your agency's position or viewpoint on the draft permit and return this form by November 3,
2004. If you have any questions on the draft permit, please contact me at the telephone number or e-mail address
listed at the bottom of this page.
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 the above permit, provided the following conditions are met:
❑ Opposes the issuance of the above pemtit, based on reasons stated below, or attached:
c: P1 mt tj /2d \ d 1 \M'-o k� Date: V�1
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 919 733-5063, extension 511 (fax) 919 733-0719
VISIT US ON THE INTERNET@http:/m2o.encstate.nc.usINPDES [e-mail]

]The Chatham News
I
F_,fL i
CHATHAM COUNTY
AFFIDAVIT OF PUBLICATION
Before the undersigned, a Notary Public of said County and State, duly
commissioned, qualified, and authorized by law to administer oaths, person-
ally appeared
Florence.Turner
first duly sworn, deposes and says: that he (she) is
Accounts Receivable Clerk
(owner, partner, publisher, or other officer or employee
authorized to make this affidavit)
PUBLIC NOTICE
STATE OF NORTH CAROLINA
ENVIRONMENTAL MANAGEMENT
COMMISSION/NPDES UNIT
1617 MAIL SERVICE CENTER
RALEIGH, NC 27699-1617
NOTIFICATION A NPDESWASTEWATER PERM PERMIT
On the basis of thorough staff review
and appplication of NC General. Statute
14,t 2i, Public law 92-500 and other
awful standards and regulations, the
North Carolina Environmental
,e­.nt Cnmmission or000ses to
national
r system
=ift to
c6va 45 (
s notice.
proposed permit will b
days after the publish
All comments receive
are considered in the I
regarding the prop(
who being Director of the NC
decide to hold a pub
proposed permit s
receive a significant
interest.
Coates of the draft
of The Chatham News Publishing Co., Inc., engaged in the publication of a
newspaper known as, The Chatham News, published, issued, and entered as
second class mail in the Town of Siler City, in said County and State; that
he (she) is authorized to make this affidavit and sworn statement; that the
notice or legal advertisement, a true copy of which is attached hereto, was
published in The Chatham News on the following dates:
�)_G Lc n
and that the said newspaper in which such notice, paper, document, or
legal advertisement was published was, at the time of each and everysuch
publication, a newspaper meeting all of tha requirements and qualifications
of Section 1-597 of the General Statutes of North Carolina and was a quali-
fied newspaper within the meaning of Section 1-597 of the General Statues
of North Carolina.
This )-(I day of
Sworn to and subscribed before me, this
person making affidavit)
a 6 Z;7-
day of
- V
to
at
regarding the
accepted until 30
ate of this notice.
prior to that date
hould the Division
degree of public
permit and other
m on file used to
present in the draft
upon request and
is of reproduction.
d/or requests for
Division of Water
nrfdress or call Ms.
604-114it between the hours of 8:00
I and 5:00 pm to review information on
1.
ature Trails MHP WW -P NPDES
rm8 NC0043257, has aloplied for a
rmit expansion from 0.04 MGD to 0.06
3D, discharging to Cub Creek in the
rpeFear River Brim. SOD, ammonia,
at nitrogen and total phosphorus are
tier quality limited parameters. This
;charge could affect future dlscharppas
the receiving stream. Au26,1tc
Notary
My Commission expires: // . e -7 - .-�2 a es

PUBLIC NOTICE
STATE OF NORTH
CAROLINA
'ENVIRONMENTAL
MANAGEMENT
COMMISSION/
NPDES UNIT
1617 MAIL SERVICE
CENTER
RALEIGH, NC 27699-
1617
NOTIFICATION OF
INTENT ISSUE A
NPDES
WASTEWATER
PERMIT
On the basis of thor-
ough staff review and
application of NC
General Statute
143.21, Public law 92-
500 and other lawful
standards and regula-
tions, the North Caro-
lina Environmental
Management. Com-
mission proposes to
issue a National Pol-
lutant Discharge
Elimination System
(NPDES) wastewater
discharge permit to
the person(s) listed
below effective 45
days from the publish
date of this notice.
Written comments
regarding the pro-
posed permit will be
accepted until 30 days
after the publish date
of this notice, All
comments received
prior to that date are
considered in the fi-
nal determinations
regarding the pro-
posed permit. The Di-
rector of the NC Divi-
sion of Water Quality
may decide to hold a
public meeting for
the proposed permit
should the Division
receive a significant
degree of public inter-
est.
Copies of the draft
permit and other sup-
porting information
on file used to deter-
mine conditions pres-
ent in the draft per-
mit are available
upon request and
payment of the costs
of reproduction. Mail
comments and/or re-
quests for informa-
tion to the NC Divi-
sion of Water Quality
at the above address
or call Ms. Carolyn
Bryant at (919)733-
5083, extension 520.
Please include the
NPDES permit num-
ber (attached) in any
communication. In-
terested persons may
Affrdauit of Publication
North Carolina
Bill Homer III, Publisher of &4t 17s>tttfurb Atra[b, a newspaper published in
Lee County in the state of North Carolina, being duly sworn, deposes and says: that
the attached advertisement of notice, in the action entitled
AUG 2 6 2004
was duly u��raid ne spaper once a week for 1 consecutive
weeks, beginning with the.issue.datedthe; b day ofpfu!�—, to L1
and ending with the issue dated the 0?01day of
,
Bi orner III, Publisher
Sworn -to and subscribed before mG; this -8 day of _
Notary
My Commission expires:
1- 3 Ada_.
s9
Received of IJ _f:)C AZ /�wGL / $ �j' the cost of the
above publication. 1a , C�
� C9
d�
By: PtZ �3z Mo j
Ny�y
,2by 'O
n.oCC�'di
O �n VJNe+t6>w
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ytit=a�'"ow�.E
Wo m
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Ozv�gx oy,t''v
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3�m oU�ma04C N

DENR/DWQ
FACT SHEET FOR NPDES PERMIT DEVELOPMENT
NPDES No. NCO043257
Facility Information
Applicant/Facility Name:
Nature Trail Associates / Nature Trails MHP W WTP
Applicant Address:
10006 Hammock Bend Rd., Chapel Hill, NC 27517
Facility Address:
Same
Permitted Flow (MGD):
0.04 (existing) 0.06 (proposed)
Type of Waste:
100 % Domestic
Facility Classification:
II
Permit Status:
Expansion
County:
Chatham
Miscellaneous
Receiving Stream:
Cub Creek
Regional Office:
RRO
Stream Classification:
WS-IV NSW
State Grid / USGS Quad:
D22SE
303(d) Listed?
No
Permit Writer:
Teresa Rodriguez
Basin/Subbasin:
030605/Cape Fear
Date:
7/16/04
Drainage Area (mi2):
5.34
Lat. 350 51' 30" N Long. 790 01' 36" W
Summer 7Q10 (cfs)
0.13
Winter 7Q10 (cfs):
0.3
30Q2 (cfs)
0.7
Average Flow (cfs):
5.6
IWC (%):
41.7
Summary: Nature Trails Associates submitted a permit expansion request and an Engineering Alternative
Analysis on February 2004. The existing W WTP has a capacity of 0.04 MGD, they want to expand to 0.06
MGD to accommodate approximately 55 more mobile homes. The existing plant consist of a pump station,
10,000 gallon equalization tank, 60,000 gallons aeration basin, clarifier, 15,000 gallons aerobic sludge
digester, tertiary sand filters, and effluent chlorination. The proposed facility will utilize some of the existing
units and install new ones. The existing pump station will remain in use. Two of the existing 5,000 gallons
aeration tanks are to be converted to equalization for a total capacity of 20,000 gallons. Two 30,000 gallons
aerobic/anaerobic basins and two 5,000 gallons clarifiers will be added. New filters and a UV system will also
be installed. Six of the existing 5,000 gallons aerobic tanks will be converted to sludge holding tanks.
Engineering Alternative Analysis: The alternatives evaluated included connection to a treatment system,
individual subsurface systems, drip irrigation, spray irrigation and reuse. The only treatment system in the
vicinity is The Governors Club, which doesn't have capacity to accept additional wastewater. Individual
subsurface systems and the reuse option are not feasible for the development. Two feasible options were
direct discharge and land application. The cost of a direct discharge is $790,000 and for land application is
$1,403,000. The most economically feasible alternative is the direct discharge.
Permit limits development — 0.06 MGD Flow:
BOD, Ammonia: A level B model was developed to determine BOD and ammonia limits. The flow data was
estimated for the location of the discharge. Apparently when a waste load allocation was completed in 1988
the flow statistics that were used didn't correspond to the discharge location. The values used were for a
location upstream of the discharge in Cub Creek. The drainage area and low flow values were recalculated
and used in the level B model. The model data and results are attached. Based on the model's results
summer monthly average limits for BOD of 10 mg/I and ammonia of 2 mg/I as will protect water quality in the
receiving stream. Following Division's policy daily maximum limits for ammonia were implemented. The daily
maximum limits are 10 mg/I for summer and 25 mg/I for winter.
Fact Sheet
NPDES NCO043257
Page I

TSS & Fecal Coliform: These limits will remain as in existing permit.
Total Residual Chlorine: A limit of 28 pg/I was included in the permit. The Division implemented a water
quality standard for TRC in 2003. All dischargers will receive TRC limits upon renewal or expansions.
Total Nitrogen & Total Phosphorus: The receiving stream is classified as Nutrient Sensitive Water (NSW)
therefore is subject to House Bill 515. An annual average mass load of 657 Ibs/yr was calculated for Total
Nitrogen using 5.5 mg/I and 0.04 MGD flow. An annual average mass load of 237 Ibs/yr was calculated for
total phosphorus based on 2 mg/I and 0.04 MGD.
DMR Review: DMRs were reviewed for the period of January 2001 to February 2004. The average flow was
0.0306 MGD, BOD averaged 6.4 mg/I, Total Nitrogen averaged 26 mg/I and Total Phosphorus 4.6 mgA.
303(d): Cub Creek is not listed in the 303(d) list. Cub Creek flows into Morgan Creek approximately 3 miles
downstream of the discharge. Morgan Creek is listed as impaired due to chlorophyll a violations and
biological integrity. The Division is developing a Nutrient Response Model for the lake to provide a basis for a
Nutrient Management Strategy. The Division expects to complete the Nutrient Management Strategy by
December 2004. The strategy could affect the nutrient limits in the permit. A nutrient reopener condition was
included in the permit to re -open the permit if the Jordan Lake strategy calls for different nutrient conditions or
limitations.
PROPOSED SCHEDULE FOR PERMIT ISSUANCE
Draft Permit to Public Notice:
Permit Scheduled to Issue:
NPDES DIVISION CONTACT
August 18, 2004
October 11, 2004
If you have questions regarding any of the above information or on the attached permit, please contact
Teresa Rodriguez at [phone] ext. 553.
NAME:
REGIONAL OFFICE COMMENTS
IF'V//
NAME: �O' DATE: qkq-J o
SUPERVISOR: DATE:ie) Z-S 6
Fact Sheet
NPDES NCO043257
0.,.. I

Nature Trail NCO043257
4/30/2004 TR
BIMs report
DMR (quarterly sample)
Calculated
Average
Month Year
Flow (mgd)
Tn (m I)
TP (mgOl
TN (lb/d)
lb/mth
Yearly Load
1
2001
.0241
15.19
1.17
5.4
166.4
2
2001
.0283
6.3
176.5
3
2001
.0249
5.5
171.9
4
2001
.0192
4.3
128.3
5
2001
.0394
8.8
272.0
6
2001
.0309
6.9
206.4
7
2001
.0265
5.9
182.9
8
2001
.0287
21
4.36
6.4
198.1
9
2001
.0261
23.1
3.27
5.8
174.4
10
2001
.033
22.3
3.39
7.3
227.8
11
2001
.037
8.2
247.2
12
2001
.037
8.2
255.4
2407.1 Ib/yr.
1
2002
.035
21.8
4.17
7.8
241.6
2
2002
.038
8.5
236.9
3
2002
.038
8.5
262.3
4
2002
.035
16.5
6.94
7.8
233.8
5
2002
.036
8.0
248.5
6
2002
.035
7.8
233.8
7
2002
.037
41.8
5.48
8.2
255.4
8
2002
.034
7.6
234.7
9
2002
.035
7.8
233.8
10
2002
.036
33.1
9.09
8.0
248.5
11
2002
.032
7.1
213.8
12
2002
.029
6.5
200.2
2843.4 Ib/ r
1
2003
.028
6.2
193.3
2
2003
.034
7.6
212.0
3
2003
.035
7.8
241.6
4
2003
.031
6.9
207.1
5
2003
.029
6.5
200.2
6
2003
.027
32.4
3.63
6.0
180.4
7
2003
.031
6.9
214.0
8
2003
.03
6.7
207.1
9
2003
.031
21.6
3.63
6.9
207.1
10
2003
.022
4.9
151.9
11
2003
.022
39.2
4.58
4.9
147.0
12
2003
.024
5.3
165.7
23�,2 Ib/ r
1
2004
.023
5.1
158.8
2
2004
.023
32.3
6
5.1
143.4
Ave
26.7
4.64
M
.�3d�qd - err-,scd

SUMMER
0
MODEL RESULTS
Discharger
:
NATURE TRAILS MHP
Receiving Stream :
CUB CREEK
----------------------------------------------------------------------
The End D.O.
is 6.50
mg/l.
The End CBOD
is 4.33
mg/l.
The End NBOD
----------------------------------------------------------------------
is 2.21
mg/l.
WLA
WLA
WLA
DO Min
CBOD
NBOD
DO Waste Flow
(mg/1)
Milepoint Reach #
(mg/1)
(mg/1)
(mg/1) (mgd)
Segment 1
------
6.26
----------------
0.39 1
----
----
-- ----------
Reach 1
15.00
9.00
5.00 0.06000

SUMMER
Seg #
Reach #
Seg Mi
D.O.
CBOD
NBOD
Flow
1
1
0.00
6.34
7.42
4.34
0.22
1
1
0.13
6.29
6.96
4.01
0.23
1
1
0.26
6.26
6.55
3.72
0.25
1
1
0.39
6.26
6.18
3.46
0.26
1
1
0.52
6.27
5.84
3.23
0.27
1
1
0.66
6.29
5.53
3.02
0.28
1
1
0.79
6.33
5.25
2.83
0.29
1
1
0.92
6.36
4.99
2.65
0.31
1
1
1.05
6.41
4.75
2.49
0.32
1
1
1.18
6.45
4.54
2.35
0.33
1
1
1.31
6.50
4.33
2.21
0.34
Seg #
( Reach #
Seg Mi
D.O.
CBOD
NBOD
Flow

*** MODEL SUMMARY DATA ***
•
Discharger :
NATURE TRAILS MHP
Subbasin
030606
Receiving Stream :
CUB CREEK
Stream Class:
C
Summer 7Q10 :
0.13
Winter
7Q10
: 0.37
Design Temperature:
26.0
LENGTH
SLOPE VELOCITY
DEPTH Kd
Kd
Ka Ka
KN
mile
--------------------------------------------------------------------------------
ft/mi fps I
ft design
@200
design @200 I
I I
design
Segment 1
1 1.31
8.19
0.100 1
0.43
1 0.33 1
0.25
1 1.68
1 1.47
0.48
Reach 1
T
Flow
CBOD
NBOD
D.O.
cfs
mg/l
mg/l
mg/l
Segment 1
Reach 1
Waste
0.093
15.000
9.000
5.000
Headwaters
0.130
2.000
1.000
7.300
Tributary
0.000
2.000
1.000
7.300
* Runoff
0.091
2.000
1.000
7.300
* Runoff flow is in cfs/mile

WINTER
Q
MODEL RESULTS
Discharger
:
NATURE TRAILS MHP
Receiving Stream :
CUB CREEK
----------------------------------------------------------------------
The End D.O.
is 8.95
mg/l.
The End CBOD
is 3.56
mg/l.
The End NBOD
----------------------------------------------------------------------
is 3.82
mg/l.
WLA
WLA
WLA
DO Min
CBOD
NBOD
DO Waste Flow
(mg/1)
Milepoint Reach #
(mg/1)
(mg/1)
(mg/1) (mgd)
-- ----------
Segment 1
------
8.42
----------------
0.00 1
----
----
Reach 1
15.00
22.50
5.00 0.06000

WINTER
Seg #
Reach #
Seg Mi
D.O.
CBOD
NBOD
Flow
1
1
0.00
8.42
4.61
5.32
0.46
1
1
0.13
8.49
4.48
5.13
0.47
1
1
0.26
8.56
4.36
4.96
0.49
1
1
0.39
8.62
4.24
4.79
0.50
1
1
0.52
8.67
4.13
4.63
0.51
1
1
0.66
8.73
4.02
4.48
0.52
1
1
0.79
8.78
3.92
4.33
0.53
1
1
0.92
8.83
3.82
4.20
0.55
1
1
1.05
8.87
3.73
4.07
0.56
1
1
1.18
8.91
3.64
3.94
0.57
1
1
1.31
8.95
3.56
3.82
0.58
Seg #
Reach #
Seg Mi
D.O.
CBOD (
NBOD
Flow

*** MODEL SUMMARY DATA ***
Discharger :
NATURE TRAILS MHP
Subbasin :
030606
Receiving Stream :
CUB CREEK
Stream Class:
C
Summer 7Q10 :
0.13
Winter
7Q10
: 0.37
Design Temperature:
14.0
LENGTH
SLOPE VELOCITY
DEPTH Kd
Kd
Ka Ka
KN
mile
------------ -------------------------------------------------------------------
ft/mi fps I
ft design
@200
I design @200 I
I
design
Segment 1
1 1.31
8.19
0.100 1
0.59
1 0.18
0.23
1.29
1 1.47
0.19
Reach 1
t
Flow
CBOD
NBOD
D.O.
c f s
mg/ l
mg/ l
mg/1
Segment 1
Reach 1
Waste
0.093
15.000
22.500
5.000
Headwaters
0.370
2.000
1.000
9.280
Tributary
0.000
2.000
1.000
9.280
* Runoff
0.091
2.000
, 1.000
9.280
* Runoff flow is in cfs/mile

NgUEST NO; 8246 SITE NO; DATE; 1/ 4/88
GVUKCE; NRCD �-Sl3ON; NEW STREAMFLOW CONDITION:
��
tl�All()N NUMBER; 0209752617 TYPE SlATION; 20 �/k
�
''''/��
STATION NAME; COB C NR B0OTHE HILL, NC ~
LOCATION; 2"3 MI BL US 15-501 AND 1.6 MI N OF BOOTHE HILL, NC
LATITUDE; 355101 LONGITUDE; 790350
~
QUADRANGLE
NUMEER;
D22SE
COUNTY CODE: 037 STAlE
CODE; 37
DISTRICT
CODE;
37
HYDROLOGIC UNIT CODE;
03030002
NKCD
BASIN
CODE;
030606
DRAINAGE
AREA;
2"90
AVERAGE FLOW; 3.00
RANGE;
2,4
`cfs
to 3^6
cfs
20
Percent
[B]
{7
�
7U1W MIN FLOW; (}^6'15
RANGE;
0.05
cfs
to 0,1
cfs
Percent
[C]
(SUMMER)
0
�
3002 MIN FLOW: 0°4
RANGE;
0"3
cfs
to 0.5
cfs
35
Percent
[B]
�
8q
7010 MIN FLOW; 0"2
RANGE:
0"1
cfs
to 0^3
cfs
35
Percent
[B]
(WINTER)
r�
702 MIN FLOW;
kANGE;
cfs
to
cfs
Percent
[ ]
~~
NOTES'
[A] Estimate is based on records collected at or near the site, and the range
indicates approximate interval in which the actual value may lie
[B] Estimate is based entirely on runoff observed at nearby streams and
therefore no degree of r^eiiabiity is attached"
[C] Because of the probable degree of inaccuracy of the estimate only
a range is given.
[D] Approximately.
Streamflow Condition Codes [R] Regulated [N] Natural
REMARKS;
REQU2ST0R-~Z0UFALY
Entered by; AEF
Fee charged; 0^00

Fib GAIL.SiT
NOZ 8246
NRU'D
SITE NO-1r,
A("TION'
DATE •
NEW
1./ 4/88
STREAMFL.OW
["ONOfTION'
STATION
NUMBER" 0209*752665 T
Y PE STATION' 20
151q%j
STATION
Nf)M!---.'V' CUB C
AB SIR 1008
NR FARRINVON,. NC
LOCATION"
It 0.8 MI AB
S
E3R 1008 AND 3.5 MI N
OF" FARRIN6TON:,
NC
L.. A T I T U D E
335108
LONUELTUDE vv
7901,J3
QUADRAN[A-E
NUMBERV*
D22SE
COUNTY
wr 0T.,1
SI'A*1'1'--" CODEvv
37 DISTRICT
Ir
CODE ' 37
HYPROLOUIC
LJN I T C 0 1)
2
L v 0303000"
NRCD
BASIN
CODE'': 030606
DRAINA0E
AREA:
5. 70
AVERAGE
FLOW" 6.00
RANGETZ
5 c f s
to 1
cfs 20 Percent
[131
7LI10 MIN
F*I..OWvf
R A N 6% E
0.1 cfs
to 0.2
cfs Percent
EC3
(SUMMER)
3VIG12 MIN
FLOW; 0.8
RANGE'
0.5 cfs
to 1.1
cfs 35 Percent
IV0
7 Q:10 MIN
v
FLOW ', 0.4
v
RANGEv
f
0.3 c S
to 0.5
cf s 35 Percit--nt
LBI
( W1 N TE R )
7 V-12 M X N
FL 0 W Z
RANOJE
cfs
to
cfs Percent
E :1
L A J Estimate is bastz!d on re -cords collsucted at or near the site:, and the range
indicates approximate inteurval in which the actual value may lie
EB3 Estimate is based entirelL p on runoff observed at neprby streams and
therefore no (.,Je;-eqr3.---e of reLiablity is attached.
LC3 Because of the probabls.-! clegreir.t of. inaccurz:.cy of the, estimate only
a range i--s qive-in.
[DJ A p p r ox, i m a t r-.!'l y
Streamflow Condition Godes L R-J R e, g u I a t e d E N J Natural
REMARKS TV
R E' (' I U E. S * 1* 0 R --- -- Z 0 U FA L Y
f::n-t�:1r,ired bt. Al' F
0. 00

JJ; AN
fil::GlUkST
N0� 8246
SITE NO,0ACTION."
GATE:
1,/ fi
6`0L11iCE wo
NIR(aU
NEW
STIREAMFLOW C.OND I *r i ON -
STATION
NUMBER.' 8.097 28-00
TYPE STA!'ION+ ,:.W
STATION
NAME'V' CUB C AT MTH NIA
I~ARRING*rON.. NC
L.OG-ATIONs
AT MTH AND
2.0 M.I. NE
OF FARRINGTON, NC
L.A'l':I:'C'tio
: 354943
LON(3:l:Tt.3GI~:
Y 79opj j7
QUADRANGLE NUMBER
IN D22SE
COUNTY COUC:
Ot'*557
G'rATE CODE-
37 D:I:G'i'RIC:T
CODE'. 37
I•IYDROL.()GIC
UNIT CODE'
Lr13030002
NRCD BASIN
CODE*" �.'�.��Ei(!If»ti
DRAINAi"E AREA V'
8.40
AVERA13E
t- LOW a 9.00
RANGE_
10
7 c f s to 1.1
cfs 20 h'erc erit
1. 8 J
U10 MIN
F1..0WT 0.2
RANGET
0.1 cfs to 0.3
cfs 3.J Percent
1BJ
N
( SUMMER)
0
3002 MIN
FI...CsW: 1.2
RANGE:
0.8 cfs to 1.6
cfs 35 Percent
IBI
7Q1.G MIN
FL-OW'G.6
RANGE'qp
0.4 cfs to 0.8
cfs 35 Percent
CBI
�
(WINTER)
�y
7Q2 MIN
1='l..OW;
RANGE.:
cfs to
cfs Percent
L 1
O
0
NOTES sw
L A I Estimate is based on records collected at or near the s i to v and the range
indicates approximate interval in which th* actual value (flay lie
L B I Estimate is haled entirely on runoff observed at nearby streams <:.>•nd
therefore no degree of rel i ab 1. i ty is attach: a.
C C`.I Because of the., pr•obak+tw: degree of inaccuracy of the estimate only
a range is given.
ED] Approx i mate Iu.
Stream f low Condition Code LRI Regulated EN::I Natural
REMARKS s
REE(:Il.1lw'STOR--•-ZOt.lF AL Y
En•t t-t,rect bwv fit1:;:F*
Fee r_•harged= 0.90

Lea
site. 0a0975a(o/4 ss°s "or"
-boo, = a a
ray =
WAJ 3.O J-s
0,075 e�5
a 1
V44-r _
35°5/
�. oao475. r s i
by-J 7900/ 53' at}=5.L- `Y1l•, .
v'pr = (o . O c.`
sy-q/0= O•/s ch
s0Q 0 = o, Ch o�
W = a, y c,�s \0.,
yc-
F. /9 //,,
a ys rq
l� JvL'
2 - `r 501
j - 5 1 -7
y'i.c.lds
QqIJ �', = L05 CDs%m`
s'4gl0'*
C, is �
7Q(0w
c
30Qa L.
,9 =
./y C.�s/miZ
z.S m,
Run C4-
s3giu= .��-•13=D.U38
r,31
PAY
1.3!
r•3 �
gJ
L�
b2 ., J
1/U(s9
cog 3s• `-l'4 a"
iArs- 00'67„
bA=
q 4 ck
0.Oq
30Qa = I, 2-
wa4rv= o.C,
j_ LA4l C
,Q,f ✓l afi,�-�z 'rcu-1
(Qow, = 5.34 min I.OSck
mil
s�W1o= s.3yK.0zCo = 0.13 C
N 7g10 =s,-3v x 0' = 0. 3-7
30 C2 a ° 5 3Y x ,IV = 0, % CAS
A�- sx- /ooK
6 ff = •7. 0 m,
Z
q =7.ox i.os
= '1.55 c{s
'79/ro = 7x o7 =
o,V9 c�
7X ./Y =
_0. 9K c s

b2asE Farr i r -on
b i
Z -2— Si 7-
-20
one t4ac4
C-6
�nao p/r5ar�
C600 N3ob �/�
/ � a-)-

LEVEL B MODEL INFORMATION
File Name: nattrls
nattrlw
t F Wit s� z
a
iii£. �'.,:it2 »4.,.,.:
M, ; .r N
�i �o o�i r�{sue• £ �� #:,�a
' .:x:,. ,..i.-,+.,... .aY�n�'--�_y*5."�'..". tF.. .�...,. xa,
Facility Name
Nature Trails MHP
To o Quad
Farrington
NPDES No.
NCO043257
USGS sta. #
Type of wastewater
100 % domestic
Date of flow estimate
7/21 /2004
Facility status
Expansion 0.04 to 0.06 MGD
Drainage Area (mi)
5.34
Receiving stream
Cub Creek
Summer7Q10 cfs
0.13
Stream class
WS-IV NSW
Winter7Q10 cfs
0.37
Subbasin
30605
Average flow cfs
5.6
County
Chatham
30Q2 cfs
0.7
Regional Office
RRO
IWC at discharge %
41.7
..- -,
NO
ItE
3 ..,•,. Ss "'t
-0046 Nq
Igg
..ram
1 zw�3
� r , < ,.: zx
Segment/Reach
1
Length of reach mi
1.31
Incremental length
0.131
Sloe
8.19
Waste characteristics
Flow MGD)
0.06
CBODm/I)
15s 15w
NBODm/l
9s 22.5w
DO m /I
5
Runoff charactericstics
s7Q10 cfs/mi
0.038
QA cfs/mi
1.33
CBOD m /I
NBOD m /l
DO m /I
TR 7/21/04

CULPEPER ENGINEERING, P.C.
P.O. BOX 733
LOCUST GROVE, VIRGINIA 22508
Phone: [phone]
Fax: [phone]
July 8, 2004
Teresa Rodriguez
Department of Environment and Natural Resources
Division of Water Quality
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Re: Permit No. NCO043257
Nature Trails WWTP
Chatham County
Dear Ms. Rodriguez,
E
R9 9 W [ N
i J U L 15 2004
L__
OENR - WATER QUALITY
POINT SOURCE BRANCH
In response to your letter regarding the permit expansion request for NC0043257,
Nature trails WWTP, the following information is provided.
1. Governor's Club was contacted verbally regarding capacity availability.
The persons contacted were both the project engineer and the facility
manager. Both individuals indicated that there was no capacity in their
facility, which could be utilized by Nature Trails. There was no formal
written correspondence to follow up the verbal "NO". They were
contacted by Mr. Raynor when the original EAA was prepared and again
after he received your May 4, 2004 letter. A written response from them
has not been received.
2. The property owned by Nature Trails Associates includes approximately
63.83 acres (County record). Much of the land encompasses steep terrain
and is occupied by the developed mobile home park. The existing
discharge facility was installed to service the park due to the lack of
available land for installation of drainfields. The land area that is not
included in the home sites and roads is limited and is scattered. Much of
this is to be additional home sites. There is some open area, which is part
of the property that is adjacent to the treatment plant. The available area
is not adequate for a land based treatment system. Please refer to the
attached survey of the property. It is noted that the physical survey of the
property indicates a total area of 66.10 acres.

The remaining property that is not currently developed, which is owned
by The Carlyle Group, is located partially in a floodplain. This parcel
include 6. acres I have attached information from the Chatham
County Site indicating the land parcels in the area. The area includes
residential parcels and parcels owned by others. Other than the
currently owned property which does not total the required acreage, it is
not believed that offsite property can be acquired that will provide
equate area and characteristics for a land based system. Please refer to
he attached assessment sheets for various parcels (undeveloped) in the
area. I have utilized an average per acre cost of four parcels to determine
the cost associated with land acquisition. It is anticipated that should
there be property that could be obtained, it would require obtaining
approximately 20 acres to yield 16 acres under irrigation.
Based on local soil conditions it is also assumed that a storage capacity of
approximately 90 days would be required for a land -based option.
There is limited area behind the existing treatment plant and the
beginning of the park. The available area here currently serves as a
buffer area between the residential area and the treatment plant. To the
left of the plant is the entrance road to the MHP. The creek is
immediately in front of the treatment plant and to the right of the plant
there is area of land, but again much of this area is topographically low
and limited. The area in the immediate vicinity is to be utilized for the
additional treatment facilities. It is assumed for the land application
option, that this area would be sufficient for the required treatment plant
and storage. Storage is assumed to be two above grade tanks providing 90
,days of storage capacity. As with the existing STP, all components will be
required to be above grade to provide the necessary flood protection.
3. A cost estimate for the proposed discharge option was previously
provided. I have provided an estimated cost for the non -discharge
scenario, which would serve the additional 20,000 gpd of flow. The cost
estimates are tabulated on the attached sheet.
If you require any additional information, please do not hesitate to call.
S;ea
. Tolliver
attachments

Cost Estimate - Facility Upgrade
Facility - 60,000 gallon Discharge
New Influent Pump Station - To be handled as a separate contract
Upgrade to existing influent pump station (as necessary)
$10,000
Modification to provide additional equalization in existing basins
$15,000
Secondary treatment facilities
$285,000
Tertiary treatment
$65,000
UV Disinfection
$20,000
Sludge Management Modifications
$80,000
Miscelaneous mechanical/electrical
$50,000
Maintenance Building
$70,000
Generator
$50,000
Site Work
$50,000
Subtotal $695,000
Contingency $70,000
Engineering/Stake-out/Control $25,000
Estimated Total Project Cost $790,000
Cost Estimate - Facility Upgrade
Facility - 20,000 gpd Land Application
New Influent Pump Station - To be handled as a separate contract
Upgrade to existing influent pump station (as necessary)
$10,000
Equalization Basin
$15,000
Secondary treatment facilities
$100,000
UV Disinfection
$8,000
Storage (90 Days)
$500,000
Effluent Pump Station to Application Sites
$20,000
Irrigation Wet well and system controls and pumps
$45,000
Irrigation Systems (3 zones)
$36,000
Groundwater Monitoring
$9,000
Maintenance Building
$70,000
Miscelaneous Mechanical/electrical
Land Acquisition - 16 acres required
$50,QOQ
C$250,000
Land Clearing0,
Site Work - Plant
$15,000
Site Work - application sites/fencing
$30,000
Subtotal $1,178,000
Contingency $105,000
Engineering/Stake-out/Control $120,000
Estimated Total Project Cost $1,403,000

Chatham County NC Web Site Information regarding Nature Trails Associates and
property owned by the Carlyle Group. Additional sheets detailing vacant parcels in
the vicinity of the park.

Page 1 of 1
Property Report - 119 NATURE TRAIL RD
GO
Property Details
Name:
NATURE TRAIL ASSOCIATES Address:
9073 NEMO ST
Owner ID:
41521
citylstatemp: 11LOS
ANGLES,CA,90069
Parcel ID:
20060
Address:
119 NATURE TRAIL RD
PIN:
9786-97-4650.000
District:
107
Deed Date:
1989
Acreage:
63.83
Deed Book:
11547
Finished Area:
1344
Deetl Page:
0725
Effective Year Built: j
1982
Legal Description:
01-5
Zoning:
Land Value:
$1,286,235
Zoning Jurisdiction:
COUNTY ZONING
Improvements Value:
11$1,397,511
Total Value:
1$2,683,746
.../usi?fonnis=ptmap&MouseX=O&MouseY=O&zoomfac=&propnum=2&proptxt=20060&Ea06/07/2004

Page 1 of 1
Property Report - NATURE TRAIL RD
TR2
si
2
TR-1
�
TR1
TR-1
1 TR-2
B
y
304
/
1
_._---. ...___._-----'---------
—
ass
Property Details
Name:
CARLYLE GROUP INC THE
Address:
9073 NEMO ST
Owner ID:
25770
CitylstatelZip:
LOS ANGELES,CA,90069
Parcel ID:
60693
Address:
NATURE TRAIL RD
PIN:
9796-17-3414.000
District:
107
Deed Date: —�
1985
Acreage:
6.08
Deed Book: 1
489
Finished Area:
11704
Deed Page: 110238
Effective Year Built:
1950
Legal Description:
01-3C
Zoning:
Land Value:
$92,460
11
Zoning Jurisdiction:
JCOUMYZONING
Improvements Value-
JIS20,773
Total Value:
1$113,233
..Iusi?formis=ptmap&MouseX=82&MouseY=300&zoomfac=l&propnum=2&proptxt=6069306l23/2004

Page I of I
Property Report - OFF MT CARMEL CHURCH RD
Property Details
Name:
MARTINDALE ALICE D CHEEK Address:
1077 A MT CARMEL CH RD
Owner ID:
18237
CitylStawzip:
CHAPEL HILL,NC,27514
Parcel ID:
20039
Address:
II OFF MT CARMEL CHURCH RD
PIN:
9796-18-1294000
District
11107
Deed Date:
1994
Acreage:
3.13
Deed Book:
636
Finished Area:
0
Deed Page
10748
Effective Year Built
0
Legal Description:
01-3D
Zoning:
Land Value:
11$17,606
lZoning Jurisdiction:
COUNTY ZONING
Improvements Value:
11s
Total Value:
1$17,606
.../usi?formis=ptmap&MouseX=4] 0&MouseY=210&zoomfac=&propnum=2&nropbd=20039)6/22; 2tit;4

Page i of 2
Property Report - OFF MT CARMEL CHURCH RD
-
-----
2
1341
13
14
1 na
6733
1794
67r �
12
i77 S;
u
'p
�? TR-1
rn
in
TR-2
TR-2
TR-1 „
Property Details
Name;
MARTINDALE ALICE D CHEEK
Address:
1077 A MT CARMEL CH RD
Owner ID:
18237
City/stateizip:
CHAPEL HILL,NC,27514
Parcel ID:
72756
Address:
OFF MT CARMEL CHURCH RD
PIN
9796-18-0099000
District:
107
Deed Date: 1980
Acreage:
3.09
Deed Book:
436
Finished Area:
0
Deed Page:
0898
Effective Year Built
0
Legal Description:
01-3-12
Zoning:
Land Value:
1$17,381
Zoning Jurisdiction:
COUNTY ZONING
Improvements Value:
$
Toial Value:
$17,381
/usi . fbrmis=ptmap&MouseX=O&MouseY�&zoom&c=&nropnurn=2&nroptxt=7275b&EaO6/22/2004

Re: Nature Trails Association CLP - Nature Trails Mobil...
Subject: Re: Nature Trails Association CLP - Nature Trails Mobile Home Park
From: Jack Roskoz <[e-mail]>
Date: Sun, 16 May 2004 22:55:58 -0400
To: Teresa Rodriguez <[e-mail]>
Dear Ms. Rodriquez,
Thank you very much for the prompt and informative response to my
inquiry. I have just one question, that being, where does the
public notice appear? Would it be in the Raleigh News and Observer
or the local Chapel Hill newspaper, and what is expected from the
appearance of the public notice, if anything?
Thanks again, I appreciate your patience explaining the procedures
to someone unfamiliar with the process.
Jack Roskoz
On May 14, 2004, at 10:22 AM, Teresa Rodriguez wrote:
Mr. Roskoz,
The permit is not at a stage to determine if there will be a
public hearing or not. This will be determined after the permit
goes to public notice. The issue of noise from the plant can be
addressed when the permittee requests the Authorization to
Construct (AtC). The AtC is evaluated only after the permit
expansion has been approved. I am looking at their request for
expansion, if this expansion is approved I will make a reference
to the noise complaints to and have the review engineer look at
the potential noise effects form the proposed treatment system at
the time of AtC review.
Teresa
Jack Roskoz wrote:
Dear Ms. Rodriquez,
In reference to the pending modification Nature Trails' waste
water discharge permit, will there be a public hearing on the
application? I and others have been very unhappy with the noise
level originating at the current facility. Recent measures have
been taken by the operator to mitigate the noise with a type of
enclosure. It is hoped that the new installation (I have been
told it will be a "package plant" but I am not entirely sure what
that means) will be designed and constructed to further reduce
the noise which is or can be very bothersome to neighbors of
Nature Trails.
1 of 2 5/28/2004 10:44 AM

Re: Nature Trails Association CLP - Nature Trails Mobil...
In the past I have spoken with or contacted Tom Belnick of your
office and Judy Garrett of the Raleigh regional office.
Thank you in advance for your consideration.
Jack H. Roskoz
60136 Davie
Chapel Hill, NC 27517
919-967-8900
Teresa Rodriguez, P.E.
Division of Water Quality
NPDES Unit
919-733-5083
2 of 2 5/28/2004 10:44 AM

O
ZQ j
May 4, 2004
Mr. Matthew Raynor
10006 Hammock Bend Rd.
Chapel Hill, North Carolina 27517
Michael F. Easley, Governor
State of North Carolina
William G. Ross, Jr., Secretary
Department of Environment and Natural Resources
Alan W. Klimek, P.E., Director
Division of Water Quality
Subject: Permit No. NCOO43257
Engineering Alternative Analysis
Nature Trails WWTP
Chatham County
Dear Mr. Raynor:
The Division has completed a review of your permit expansion application submitted on
February 4, 2004. The following information is required before we can proceed with the
final evaluation and permit modification:
1. Your letter states that the Governor's Club was contacted and no capacity was
offered. Provide documentation received from the Governor's Club stating so.
2. Your report also states that 16 acres of land would be required for a land based
application system. No information was provided on the number of acres available
for this type of system. Please provide a site map including property boundaries, the
location of existing structures, proposed structures and available area for land
application. If the available land is not sufficient evaluate the cost of adjacent land
and provide an estimate of how much land would be needed.
3. A Present Worth Analysis shall be completed for the non -discharge and discharge
options. Present the results of the cost per alternative in a table format. The
unfeasible alternatives will be eliminated based on overall cost.
The discharge from Nature Trails MHP is into the Jordan Lake watershed. Jordan Lake
is designated as Nutrient Sensitive Waters. The Division is developing a Nutrient Response
Model for the lake to provide a basis for a Nutrient Management Strategy. The Division
expects to complete the Nutrient Management Strategy by December 2004. The strategy
could affect the nutrient limits in your permit.
Please provide the above information to the Division within 30 days of receipt of this
letter. If you have any questions concerning the testing requirements, please call me at (919)
733-5083, extension 553.
Sincerely,
1�� /2,�
Teresa Rodriguez
NPDES Unit
Cc: NPDES Files
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer Visit us on the INTERNET @ www.enr.state.nc.us

lz d�f2/�u�
NATURE TRAILS M.H P.,L.L.C.
5604 PRESTON PLACE
RALEIGH, NORTH CAROLINA 27604
January 29, 2004
David A. Goodrich
NPDES Unit Supervisor
North Carolina Division of Water Quality
NPDES Unit
1617 Mail Service Center FEB I, 4 2001
Raleigh, North Carolina 27699-1617
Re: Nature Trails NW — NPDES No. NCO043257
Dear Mr. Goodrich,
In response to the recent correspondence from Mr. Belnick and a follow up conversation
with him regarding the permit modification request for an expansion of flow at the
facility to GD from MMGD I have enclosed the following information.
1. I have enclosed three copies of the permit application.
2. I have enclosed three copies of the original EAA that was submitted to
your office and which was subsequently returned. I have included three
copies of the recently provided addendum which addressed the concerns
associated with the original submittal.
3. I have provided the Local Government form. -
4. I have enclosed a check for $215.
I had Ms. Tolliver speak with Mr. Belnick regarding the resubmission. It is understood
that the original document provides the required assessments required regarding
evaluation of alternatives to surface discharge. Although the original request in the EAA
addressed a request for a flow of 0.80 MGD, the evaluation of alternatives remain valid.
Specifically, the original EAA determined the following regarding disposal alternatives:
1. The closest POTW is the City of Durham which is more than 8 miles away
and in another county. The Nature Trails is a private facility and does not have
the advantage of eminent domain to secure the easements which would be
required. In addition, the different jurisdictional location creates a problem for
acceptance of flow.
2. The closest privately owned treatment facility, Govenors Club was contacted
and no capacity was offered.

3. On -site, individual subsurface facilities are precluded due to steep terrain and
the predominant soil characteristics. The existing plant was installed due to a
lack of available soils for on -site management of wastewater.
4. A community subsurface system was determined to not be a viable alternative
due to a lack of property available with soil characteristics that are acceptable.
The open property owned on -site is a floodway that has Creedmoor soils
which have limited capability for wastewater management. The same property
was available when the existing facility was installed and was not considered
a viable location for an installation.1
5. The area was evaluated to determine if an irrigation or drip facility could be
installed. Based on the assessment, the area was not considered viable for a
1
system. The hydraulic evaluation determined that the site soils, Creedmoor,
t,
appear to have an available capacity of 17.05 in/yr. For the modified request,
for
�A01
the additional flow of 201000_gpd would require a minimum area active
a lication of � 6 acres:'In addition, area would be required for the storage of
generated flow during the periods of non -application, Additionally, reserve
areas and buffers would be required. The area of open land owned is not
adequate to manage the revised proposed expansion. The non -developed--------
---�
portion of the park is located at the entrance and is not large a ugh �o
provide the required area. The undeveloped land is limited t es
from due to the dense residential
, r
6. Reuse was deleted consideration
development and the steep topography. Additionally, there are no central
5
facilities like HVAC that might be appropriate for reuse. The development
consists of individual mobile homes.
7. The alternative appears to be an expansion of the existing surface water
discharge.
Following Mr. Belnick's review of the original EAA, the flow increase was revised to a
total flow for the facility of 60,000 gpd. In his letter, he indicated that it would be
necessary to provide a revised discussion of the proposed facilities and a revised cost
estimate. Due to the fact that the original submittal indicated the only viable alternative
for the expansion is a surface water discharge (as detailed above) the cost associated with
expanding the facilities to 60,000 gpd have been limited to the required treatment to
comply with the anticipated discharge limits, specifically the TN of 3.67 mg/l for the
60,000 gpd flow. The addendum prepared by Rebecca Tolliver provides the requested
cost estimate.
Hopefully I have provided you with all of the information necessary to process the
request. If you require any additional information, please do not hesitate to call.
Sincerely,
Matthew Raynor

NATURE TRAILS FACILITY UPGRADE TO 60,000 GPD
The Nature Trails Facility requests that the facility discharge be allowed to expand from
the existing 40,000 gpd flow to a projected flow of 60,000 gpd. The request is a change
from the previous request for an expansion to 80,000 gpd. It is understood that the
discharge criteria for total nitrogen is based on a TN of 5.5 based on the prior flow of
40,000 gpd. The allowed loading for the proposed discharge of 60,000 gpd will thus be a
TN of 3.67. It is also understood that the limit will be a mass based limit. "
The facility desires to move ahead with the request. A treatment facility to meet these
strict criteria will be designed and is to incorporate aero " aand anoxic treatment
chambers to obtain the required treatment. Final filtration is also proposed prior to
ultraviolet disinfection. The main treatment facilities are to be new units. Portions of the
existing facilities are to be incorporated into the new plant.
The facility influent pump station is to remain. A new remote station will be required for
flows generated on portions of the property located at an elevation lower than the existing
station. The new station will direct influent flow to the equalization facilities. It is
anticipated that the existing surge tank will remain in operation. In addition, a portion of
the existing plant will be converted to additional equalization. This expansion will afford
the required surge capacity. Two of the existing basins will be converted to equalization;
conversion of two of the existing basins will provide a total surge capacity of 20,000
gallons. The conversion will incorporate the installation of grinder pumps. The converted
facilities will have pumps to match the existing. There will then be a total of four surge
pumps each rated at 30 gpm The existing facility and the converted portion of the
existing plant will both discharge to the new treatment plant. Aeration is provided in the
existing surge basin and will remain in the basins to be converted to surge control.
Dual new package type secondary treatment plants are to be installed. The facilities are to
include anoxic and aerobic zones. Each train will treat 30,000 gpd. The initial tank in the
flow scheme is to be an anoxic basin, followed by an aeration basin and a clarifier. There
will be another anoxic basin and aerobic basin and clarifier. The plant will also have
chemical addition for phosphorus removal. There are to be polishing filters prior to UV
disinfection. A schematic has been provided indicating the proposed flow configuration.
The remaining, six existing aeration basins in the existing facility will be converted to
sludge management/holding facilities. In addition the existing sludge holding facilities
are to be retained. The existing clarifiers will be evaluated and a determination made
regarding their reuse. The expanded sludge holding will be beneficial for the scheduling
of final sludge management.
Based on the need to recycle flows to achieve the required level of treatment, the basins
are to include adequate capacity to address the return flows. A brief description of the
proposed facilities follows.

Influent Pump Station — The existing station is to remain. An additional station may be
required to address flows generated from a topographic location lower than the existing
station. The pump station, when required, is to be handled as a separate item The
existing pump station pumping capacity will be upgraded as necessary to meet demand.
Both stations (existing and future) will pump to equalization.
Equalization -- The existing 10,000 gallon equalization basin is to remain. Two of the
5,000 gallon basins in the existing plant are to be converted to equalization as well for a
total capacity of 20,000 gallons. Each of the converted basins will be equipped with a 30
gpm grinder pump. The converted basins will be equipped with an influent bar screen and
will be interconnected.
Secondary treatment — Secondary treatment will include two plants each capable of
treating 30 000 gpd. Each facility will be equipped with anoxic (with mixers) and
aeration chambers. The proposed capacities for each facility are to be approximately
6,000 gallons initial anoxic zone, 15,000 gallon aerobic zone, 5,000 gallon clarification,
3,000 gallon anoxic zone, 3,000 gallon aerobic zone, 5,000 gallon clarifier.
Filtration — Tertiary filters are to be provided. The filters are to be dual filters sized to
treat the 60,000 gpd flow. The filters may be DynaSand filters. The DynaSand filter is a
continuous backwash, upflow, deepbed, granular media filter. Tertiary denitrification is
accomplished by establishing an organic substrate in the anoxic zone of the sand filter. A
methanol addition may be required to establish the substrate and achieve nitrate
reduction.
Phosphorus removal - It is anticipated that there will be chemical addition (ferrous
sulfate) to the treatment plant for the removal of phosphorus.
Sludge dement — Waste sludge is to be managed in the existing sludge
digestion/holding (15,000 gallons) facilities and six of the existing aeration basins
(30,000 gallons) are to be converted to sludge management units. The expanded capacity
for sludge management will afford flexibility required for the ongoing contract biosolids
management operations.
It is anticipated that a new equipment building will be provided to house mechanical
equipment and provide space for control and lab equipment. The emergency generator
will be associated with the equipment building as well.

Costs have been estimated for the proposed facility upgrade and are presented below
New Influent Pump Station — To be handled as a separate contract.
Upgrade to existing pump station (as necessary)
$10,000
Modification to provide additional equalization in existing basins
$15,000
Secondary treatment facilities
$2855000
Tertiary treatment
$65,000
UV Disinfection
$20,000
Sludge Management Modification
$80,000
Miscellaneous mechanical/electrical
$50,000
Maintenance building
$703,000
Generator
$503,000
Site work
$501,000
Sub Total $695,000
Contingency $70,000
Engineering/Survey Stake-out/Control $25,000
Estimated Total project cost $790,000

Secondary
Schematic Layout of Proposed Treatment Plant Upgrade
Filter
Filter
Operations
Building
Ex.
Existing EQ
SHT SHT SHT EQ Q
Reserve I SHT
SHT I SHT
Reserve
New Facilities Highlighted
Existing Facilities to be Retained & Reused
Flow Meas
Discharge

mailbox:///C I /Documents%20and%20Settings/charles weaver/Appli...
Subject: Re: Nature Trails Association - Chatham County
From: Charles Weaver <[e-mail]>
Date: Wed, 21 Jan 2004 07:44:04 -0500
To: Jack Roskoz <[e-mail]>
CC: Tom Belnick <[e-mail]>
Mr. Roskoz:
The Carlyle Group [owners of Nature Trails MHP] submitted a request to expand the
Nature Trails WWTP from 0.4 MGD to 0.8 MGD on March 10, 2003. That submission was
poorly prepared and incomplete; additional information was requested on March 11,
2003. Sixty days passed, during which no additional information was submitted. The
application was returned on May 19, 2003 [see attachment Return 2193.doc]. The
Carlyle Group was notified that they could re -submit the application within 6 months
[by late November 20031 and pay no additional fees IF they submitted all the
necessary information.
The Carlyle Group submitted another incomplete application on January 12, 2004 with
no fee, seemingly oblivious to all they had been told during 2003. That application
was returned on January 14, 2004 [see attachment Return2208.doc].
If you have additional questions about the 2003 submittal, contact Tom Belnick
[[e-mail]] in our Unit. I'd also recommend you contact Bob Mangum or
Randy Jones at the NC DENR Raleigh Regional Office [919 571-4700]; Bob did a site
inspection in 2002 and Randy may also be familiar with that facility.
CHW
1 of 1 1 /21 /2004 7:44 AM

imap://charles. [e-mail]:143/f...
Subject: Nature Trails Association - Chatham County
From: Jack Roskoz <[e-mail]>
Date: Tue, 20 Jan 200415:30:49 -0500
To: [e-mail]
Dear Mr. Weaver,
I am writing you because you are identified
as having been the primary reviewer of the
Association in Chatham County back in 2001.
on the list of issued NPDESWWRRO permits
permit issued (NC0043257) to Nature Trails
I have been in contact with Nature Trails for the last year regarding the noise level
coming from their waste treatment plant. They told me last February that they were
planning a new "package plant", had applied to the State for approval, and expected
to be under construction in 2 or 3 months. I said fine presumably the new package
plant would have the offending motor/pump enclosed or in some other location as would
solve the noise problem. Having seen no construction activity, I inquired of them
back in August and again in November regarding the plant. They continue to say they
were waiting for State approval and that was the cause of delay.
I recently have been checking on what info might be available from NC Division of
Water Quality and found two lists. The first listing issued permits (where I found
your name and the permit number for Nature Trails) and the second listing of pending
permits - which, I assume, would include Authorizations to Construct. I don't see
anything relating to Nature Trail in either list which would indicate that an
application for a new waster treatment plant has been made. Perhaps I have not found
the correct source of information or perhaps it is not available on line.
Before I go further with Nature Trails, I would ask if you, or someone to whom you
could refer the question, could verify that an application for a new waste disposal
plant has been made. And, if so, is there some particular problem with the
permitting of same, i.e. have they provided sufficient information, etc.
Thank you in advance for your attention to my request.
Jack H. Roskoz
60136 Davie
Chapel Hill, NC 27517
919-967-8900
1 of 1 1/21/2004 7:44 AM

F'n
©DA
Mr. Matthew Raynor
The Carlyle Group
5604 Preston Place
Raleigh, North Carolina 27604
Dear Mr. Raynor:
Michael F. Easley
Governor
William G. Ross, Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E., Director
Division of Water Quality
January 14, 2004
Subject Return of NPDES Application
Nature Trails MHP
NPDES No. NC0043257
Chatham County
Return # 2208
The Division is returning your NPDES permit modification request to expand your permitted flow from 0.40 MGD
to 0.60 MGD. This modification request was received on January 12, 2004. In the last return letter dated 5/19/03
(Return #2193), the Division indicated that the perrnit modification fee of $215 would be applied for any subsequent
submissions received within six months. Since your submission was received outside this timeframe, you will need to
include a new permit modification fee. In addition, as indicated in the last letter, the previous application was
returned as incomplete. In order for us to accept another application and begin the review process, you will need to
resubmit a complete application package, which includes three copies of the application and EAA. If you have any
questions about submission requirements, please contact me at 919-733-5083, ext. 543.
Sinc ely,
om Belnick
NPDES Unit
cc: Rebecca Tolliver, Culpepper Engineering, POBox 733, Locust Grove, VA 22508
NPDES File
Return Letter File
N. C. Division of Water Quality I NPDES Unit Phone: [phone], extension 511 Fax: [phone]
1617 Mail Service Center, Raleigh, NC 276WI617 DENR Customer Service Center..1 800 623-7748
Internet: h2o.enr.state.nc.us e-mail: [e-mail]

CULPEPER ENGINEERING, P.C.
P.O. BOX 733
LOCUST GROVE, VIRGINIA 22508
PHONE: [phone]
FAX: [phone]
September 3, 2003
Mr. Charlie Horne, County Manager
Chatham County
P.O. Box 87
Pittsboro, NC 27312
Re: Nature Trails Mobile 'dome Park
NPDES Permit Application
Dear Mr. Horne,
The Nature Trails Mobile Home Park has been in contact with the Division of Water
Quality -- NPDES Unit regarding the expansion of the wastewater treatment facility at the
Nature Trails MHP from a flow of 0.04 MGD to a capacity of 0.06 MGD. As part of the
process, the facility is required to request the local government complete the attached
Local Government Review Form. The form requests that the County which has
jurisdiction complete and return the form to the applicant.
Once you have reviewed the provided information and completed the form, please return
it to the Nature Trails M.H.P., L.L.C. local representative, Matthew Raynor. His mailing
address is:
Matthew Raynor
5604 Preston Place
Raleigh, NC 27604
If you have any questions regarding any of the attached information, please do not
hesitate to contact me at 540 423-9706 or Mr. Raynor at 919 217-0036.
Thank you for your assistance in this matter.
Sincer
Reb ca. S. Tolliver, P.E.

Local Government ]review Requirements
for the issuance of New Non -Municipal Domestic wastewater Discharge Permits
General Statute Overview
North Carolina General Statute 143-215.1 (c)(6) allows input from local governments in the issuance of NPDES Permits for
non -municipal domestic wastewater treatment facilities. Specifically, the Environmental Management Commission (EMC) may
not act on an application for a new non -municipal domestic wastewater discharge facility until it has received a written statement
from each city and county government having jurisdiction over any part of the lands on which the proposed facility and its
appurtenances are to be located. The written statement shall document whether the city or county has a zoning or subdivision
ordinance in effect and (if such an ordinance is in effect) whether the proposed facility is consistent with the ordinance. The
EMC shall not approve a permit application for any facility which a city or county has determined to be inconsistent with zoning
or subdivision ordinances unless the approval of such application is determined to have statewide significance and is in the best
interest of the State.
instructions to the Applicant
Prior to submitting an application for a NPDES Permit for a proposed facility, the applicant shall request that nth.
the aearbv cry and cOmM gnvernment complete this form.
The applicant must:
♦ Submit a copy of the permit application (with a written request for this form to be completed) to the clerk of the
city and the county by certified mail, return receipt requested.
♦ If either (or both) local government(s) fail(s) to mail the completed form, as evidenced by the postmark on the
certified mail card(s), within 15 days after receiving and signing for the certified mail, the applicant may submit
the application to the NPDES Unit.
♦ As evidence to the Commission that the local govemment(s) failed to respond within 15 days, the applicant shall
submit a copy of the certified mail card along with a notarized letter stating that the local government(s) failed to
respond within the 15-day period.
Instructions to the i..ocal overnment
The nearby city and/or county government which may have or has jurisdiction over any part of the land on which the
proposed facility or its appurtenances are to be located is required to complete and return this form to the applicant
within 15 da s of receipt. The form must be signed and notarized.
Name of to go
cal vernment C� �A�" e-191 V1
(City/County)
Does the city/county have jurisdiction over any part of the land on which the proposed facility and its appurtenances
are to be located? Yes No [ ] If no, please sign this form, have it notarized, and return it to the applicant
Does the city/county have in effect a zoning or subdivision ordinance? Yes [1(] No [ ]
If there is a zoning or subdivision ordinance in effect, is the plan for the proposed facility consistent with the
ordinance? Yes No [
Signature
((City Manage County Manager)
of
State o€� C.�rOli County
n this dh —.day of 2, personally appeared before me, the said
• to me known and known to me to be the person
name_ e 1-�- A c� t Sb n -
escribed in and who executed the foregoing document and he (or she) acknowledged that he (or sheCIM11tt
d ��
executed the same and being duly sworn by me, made oath that the statements in the foregoing
are true.
My Commission expires Jq b (p .(Signature of Notary Public)
LX!yNo
TA#j

NPDES APPLICATION FOR PERMIT RENEWAL - SHORT FORM A
For municipal discharges < 1 MGD without a pretreatment program (or similar publicly owned
discharges <1MGD)
N. C. Department of Environment and Natural Resources
Division of Water Quality / NPDES Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
http://h2o.enr.state.nc.us/NPDES/
NPDES Permit CO043257
Please print or type
r
1. Contact Information:
Facility Name
Nature Trails MHP WWTP
Owner Name
Nature Trails MHP, LLC ATTN: Matthew Raynor
Street Address
5604 Preston Place
City
Raleigh
State / Zip Code
North Carolina, 27604
Telephone Number
( 919 ) 217-0036
Fax Number
( 919 ) 217-4070
e-mail Address
[e-mail]
Operator Name
John Dodson
Street Address
5728 Chambers Court
City
Cedar Grove
State / Zip Code
North Carolina, 27231
County
Orange
Telephone Number
( 919 ) 245-0145
2. Location of facility, producing discharge:
Check here if same as above
Facility Name (If different from above) Nature Trails MHP W'WTP
Street Address or State Road 326 Nature Trails Road
City Chapel Hill
State / Zip Code North Carolina, 27517
County Chatham
3. Design flow of facility 0.06 MGD. Average monthly flow 0.032 MGD
Existing facility is permitted for 0.04 MGD (12 Month Average)
4. Population served:
1-199 200-499 500-999 1,000-4,999 5,000-9,999 10,000 or more
S. Do you receive industrial waste? ❑ Yes a No
If yes, enter approximate number of industrial dischargers into system

NPDES APPLICATION FOR PERMIT RENEWAL - SNORT FORM A
For municipal discharges <1 MGD without a pretreatment program (or similar publicly owned
discharges <1MGD)
6. List all permits, construction approvals and/or applications:
T r e
Permit Number
RCRA
NA
UIC
NA
NPDES
NCO043257
PSD
NA
NESHAPS
NA
Type
Permit Number
Non -Attainment
NA
Ocean Dumping
NA
Dredge/Fill Permits NA
Other
NA
7. Name of receiving stream(s) (Provide u map showing the exact location of each outfall):
Cub Creek
S. Is this facility located on Native American lands? (check one)
YES R NO a
I certify that i am familiar with the information contained in the application and that to the
best of my knowledge and belief such information is true, complete, and accurate.
0
Printed name of Person Signing
Signature of Applicant
A_-1k 4,-LW
Title
Date
North Carolina General Statute 143-215.6 (b)(2) states: Any person who knowingly makes any false statement
representation, or certification in any application, record, report, plan, or other document files or required to be
maintained under Article 21 or regulations of the Environmental Management Commission implementing that
Article, or who falsifies, tampers with, or knowly renders inaccurate any recording or monitoring device or
method required to be operated or maintained under Article 21 or regulations of the Environmental Management
Commission implementing that Article, shall be guilty of a misdemeanor punishable by a fine not to exceed
$10,000, or by imprisonment not to exceed six monthnsonment not morel than 5 years, or both, fop a similar
punishment by a fine of not more than $10,000 or imp
offense.)
12102
2of2

`0 0 3 10: -'-35 91921740-0 MATT RAYNOR
PAGE 02
NCO0432S7
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1
Y
I\It. Matthew Ravnor
The Carlyle Group
5604 Preston Place
Raleigh, North Carolina 27604
Dear Mc. Raynor:
Michael F. Easley
Governer
William G. Ross, Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E., Director
Division of Water Quality
May 19, 2003
Subject: Return of NPDES Application
Nature Trails MHP
Chatham Counts
Return # 2193
The Division is returning your NPDES permit modification request to expand your pe—,tutted flow from 0.40 i IGD
to 0.80 MGD. This modification request was received on March 10, 2003. The NPDES Unit subsequently requested
additional information on March 11, 2003, but has not received this data. Due to the volume of permits curendv
under review, the NPDES Unit is unable to store incomplete applications pending receipt of additional data. If you
resubmit a completed application within sit months, your original application fee will be applied towards the
resubmission (Note: please include a copy of this letter to support a resubmission without fee). The resubmission
should address the following items:
L Incomplete evaluation. Based on discussions with Culpeper Engineering. i_ appears that you now plan to
request an expansion to 60,000 gpd, rather than 80,000 gpd. The EA -A cost estimates should be based on
treating 60,000 gpd. Please note that based on House Bill 515 requirements, the total nitrogen mass Ln- t is
frozen based on a TN concentration of 3.5 mg/1 and the permitted flow- as of 1997 (40,000 gpd). An increase
to 60,000 gpd will effectively reduce the TN limit to 3.67 mg/1. However, please note that TN compliance
will be based on a mass -based limit rather than a concentration -based limit. As previously discussed, you
should include information on the nitrogen treatment capabiliry of the proposed package treatment system.
There are no anticipated changes to the current ammonia-` limits of 2 mg/1 (summer) and 5 mg/ l (winter).
2. Local Government Review Form. The submittal lacked a completed Local Government Review Form.
Enclosed please find a Local Government Revie•a- Form, as well as an Engineer_ng Alte_ :adves Guidance Document.
If you have any questions about this project or permit application requirements, please contact Tom Belnick at (919,
733-5083,extension 543.
Sincerely,
David A. Good--ch
NPDES Unit Supervisor
cc: Raleigh Regional Office, Water Quafiry (Paul Clark)
Rebecca Tolliver, Culpepper Engineering, POBox 733. Locust Grove, VA 22508
NPDES He dC 0043151
N. C. Division of Water Doaiity I NPDES Unit Phone: [phone]. exle— or. 511 Fax: [phone]
1617 Mail Service Center, Rale!ch. NC 27699-1 c17 DENR Customer Sernce Cer:e- 1 800 623-7748
Inlemet: h2o.enr.steterc.us e--ma!: ciades.wea,e-'�ncc.2..ra.

CULPEPER ENGINEERING, P.C.
P.O. BOX 733
LOCUST GROVE, VIRGINIA 22508
PHONE: [phone]
FAX: [phone]
May 2, 2003
Tom Belnick
North Carolina Department of Environment and Natural Resources
Division of Water Quality
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
Re: Nature Trails Mobile Home Park
Dear Mr. Belnick,
£OOZ 5 - 1,V W
�c
This letter is to request that you temporarily place the previously submitted Engineering
Alternatives Analysis regarding an expansion of the Nature Trails W WTF on hold. It is
understood that this request should allow you to not respond to the request within the 180
day review period. Having spoken with you and Mr. Goodrich, it has been decided that
the facility should limit their expansion request to 60,000 gpd. Prior to finalizing an
amendment to reflect to flow modification, I would like to clarify the following items.
Based on the requirements detailed in BB 515, it is understood that the total nitrogen
loading permitted for an expanded facility is based on the statutory 5.5 mg/l total nitrogen
concentration and the flow which was permitted at the time the NSW designation was
made. Accordingly, it is understood that the total nitrogen loading which will be allowed
for an expansion at this facility is limited to an annual loading resulting from an average
concentration of 5.5 mg/1 @ 40,000 gpd or an average daily loading of 1.835#/day.
Assuming the requested expansion to 60,000 gpd can be approved, the average daily total
nitrogen allowed would be 3.67 mg/1 total nitrogen. It is understood that the loading is an
annual average requirement.
Prior to submitting an amendment to the EAA to reflect the reduced flow request, I would
like to clarify proposed effluent limitations. Specifically, please clarify if the total
nitrogen loading will be specific with regards to Ammonia-N concentration. The existing
permit includes seasonal limits for Ammonia-N. Will these seasonal limits be continued
at the expanded flow ? Specifically will the permit include a 1.3 mg/1 requirement for
Ammonia-N during the period from April 1 through October 31 and a 3.3 mg/l limit
specified during November 1 through March 31 or will the limits be expressed only as
Total Nitrogen.
It is assumed that the following limits would be required for a 60,000 gpd discharge:

�l
Parameter:
Monthly Average:
Flow
0.06 AGD _
BDD-5
11.33_mg/1_
TSS
20.0 mg/l
Fecal Coliform
200/100 ml
Total N
3.67 mg/1
Total P
1.33 mg/l
I also was curious about the HB 515 notation that the total nitrogen limitation is
described as an average, annual loading, criteria. I would like to understand the
importance of this stipulation and be better able to clarify its meaning. If the permit is
issued at 60,000 gpd and the new plant is constructed will the plant be in violation if a
concentration limit is exceeded even if the loading is in compliance? As an example: if
the facility is discharging at an average flow of 50, 000 gpd during a month and reports a
total nitrogen result for the month of 3.88 mg/l is this a violation? The facility daily
loading based on 60,000 gpd and 3.67 mg/1 is 1.84 #/day. Even though the concentration
in the example is above the concentration of 3.67 mg/l the mass loading resulting from
the sample presented is 1.62 #/day. Please clarify if this constitutes a violation or not. I
was trying to be able to clarify this.
I am proceeding with an EAA update which reduces the flow to 60,000 gpd and would
appreciate the above clarifications so as to be able to provide you with a complete
submittal.
Again, please put the project review on hold until the update is finalized. It would be
great if you could restart the 180 day review period once the update is presented.
Since ,
Rebe S. Tolliver
cc: Matt Raynor

IWC Calculations
Nature Trails MHP
NCO043257
Prepared By: Tom Belnick, NPDES Unit
Enter Design Flow (MGD): 0.06
Enter s7010(cfs): 0.075
Enter w7Q10 cfs): 0.2
Residual Chlorine
Ammonia (NH3 as N)
(summer)
7Q10 (CFS)
0.075
7Q10 (CFS)
0.075
DESIGN FLOW (MGD)
0.06
DESIGN FLOW (MGD)
0.06
DESIGN FLOW (CFS)
0.093
DESIGN FLOW (CFS)
0.093
STREAM STD (UG/L)
17.0
STREAM STD (MG/L)
1.0
UPS BACKGROUND LEVEL (1
0
UPS BACKGROUND LEVEL
0.22
IWC (%)
5 6
IWC (%)
55.36
Allowable Conc. (ug/1)
31
Allowable Conc. (mg/1)
1.6
Ammonia (NH3 as N)
(winter)
7Q10 (CFS)
0.2
Fecal Limit
200/100ml
DESIGN FLOW (MGD)
0.06
(If DF >331; Monitor)
DESIGN FLOW (CFS)
0.093
(if DF <331; Limit)
STREAM STD (MG/L)
1.8
Dilution Factor (DF)
1.81
UPS BACKGROUND LEVEL
0.22
IWC (%)
31.74
Allowable Conc. (mg/1)
5.2
INPDES Servor/Current Versions/IWC
5/19/03

ENGINEERING ALTERNATIVES
EVALUATION
NATURE TRAILS MOBILE HOME
PARK
December 2002
Everette L. Chambliss, Jr.
t
The Wooten Company
120 North Boylan Avenue
Raleigh, North Carolina 27603
Phone: [phone]

Table of Contents
GENERALINFORMATION.....................................................................................1
Project
ProjectDescription................................................................................................ I
ExistingFacility..................................................................................................... I
DISPOSAL ALTERNATIVES................................................................................... 3
Connection to a Publicly Owned Treatment
Connection to a Privately Owned Treatment Works .............................................. 3
Individual Subsurface Systems..............................................................................3
Community Subsurface Systems...........................................................................4
Drip or Spray Irrigation System............................................................................ 4
Reuse..................................................................................................................... 5
Surface Water Discharge Through the NPDES Program......................................6
Alternative Comparisons and Costs....................................................................... 9
SUMMARY..............................................................................................................10
FIGURES
Figure 1 Flow Schematic Existing treatment Plant.................................................2
Figure 2 Flow Schematic Proposed Treatment Plant Expansion ............................8

GENERAL INFORMATION
PROJECT IDENTIFICATION
The project consists of expanding the wastewater treatment capacity of the Nature Trails
Mobile Home Park wastewater treatment plant in Chatham County, North Carolina. This
facility is located off of NCSR 1009 and discharges into Cub Creek in the Cape Fear
River Basin. The treatment plant discharges under the terms of NPDES Permit Number
NC0043257. There arc no office or telephone facilities at the wastewater treatment plant,
but the management for the facility can be reached by calling Mr. Matthew Raynor at
919-217-0036. This report has been prepared by:
Mr. Everette L. (Ford) Chambliss, Jr., PE
The Wooten Company
120 North Boylan Avenue
Raleigh, North Carolina 27603
Phone: [phone]
PROJECT DESCRIPTION
The Nature Trails Mobile Home Park is not completely built out, and there exists within
the confines of the Mobile Home Park numerous sites where additional trailers may
locate. There also exists within Chatham County and the Triangle area as a whole a
strong demand for affordable housing like that offered in the Nature Trails Mobile
Home Park. Accordingly, management of the the Nature Trails Mobile Home Park
wishes to continue to add units until its wastewater flow is 0.080 mgd. Increasing its
discharge to 0.080 mgd will not exhaust its capacity to add housing units, but this level
of development has been selected because it can be accommodated with a treatment
system without any increase in the wasteload allocation now embodied in the Nature
Trails Mobile Home Park NPDES Permit.
EXISTING FACILITIES
The Nature Trails Mobile Home Park existing wastewater treatment facilities will
generally not be kept in service in their existing capacity. These facilities consist of an
influent pump station, and an equalization tank/pump station (added in 1998), the original
treatment system, and sludge holding tanks added recently. Figure 1 is a schematic flow
Wastewater Treatment Plant Expansion Study

flow diagram of this system. The original treatment plant consisted of a series of 10
precast concrete tanks configured to act as aeration basins and settling tanks, and
additional similar tanks used for sludge digestion/holding. As actual flows approached
design flows, reliable operation became progressively more difficult, and the equalization
basin was added. This basin proved effective in allowing for better process control and
better clarifier efficiencies, and the facility has been able to consistently meet effluent
limits while operating essentially at design flow. Stabilized sludge is disposed of by
contract sludge hauler. The sludge holding tanks were added to assure that inclement
weather preventing disposal operations would not force the aeration basin to operate at
excessively high sludge ages, and these tanks have also contributed to process stability.
The original core system is, however, more than 20 years old, and is not readily amenable
to upgrading or expansion.
�ixar
In+In
M
y
Wastewater Treatment Plant Expansion Study
FIGURE I
FLOW SCHEMATIC,
EXISTING TREATMENT PLANT

DISPOSAL ALTERNATIVES
CONNECTION TO A PUBLICLY OWNED TREATMENT WORKS
Connection to a public owned treatment works would allow the discharge of the Nature
Trails Mobile Home Park to be eliminLe
egrettabl est ublicly
owned treatment works is that of theDurh?62nection
ore th 8 miles awa d ins
another County. The distance alone m economically infeasible.
Even if distance were not so great, there are other problems that would prevent the
connection. As a private enterprise, Nature Trails Mobile Home Park has no means to
secure the force main route to the Durham plant. While encroachment agreements with
the NC DOT (North Carolina Department of Transportation) could probably be secured,
NC -DOT attorneys have repeatedly advised that for private enterprises, easements from
all property owners along the pipeline route may also be required. Nature Trails Mobile
Home Park is, with no power of eminent domain, in no position to secure such
easements. Even were the distance and easement obstacles to be overcome, it is doubtful
the City if Durham would agree to yield any of its capacity to a private development in
another County.
CONNECTING TO A PRIVATELY OWNED TREATMENT WORKS
There is a privately owned, treatment works located relatively close to the Nature Trails
Mobile Home Park facility. This is the treatment system operated for the Governors
Club. This facility was contacted informally about providing capacity to the Nature Trails
Mobile Home Park. Not surprisingly, no capacity was offered, since the Owner's of the
facility need all that treatment capacity they can secure to meet the needs of their own
development.
INDIVIDUAL SUBSURFACE SYSTEMS
The development density, steep terrain, and predominate soil characteristics preclude use
of individual on -site subsurface systems. The original surface discharge treatment
system was installed because of the unsuitability of individual on -site systems for the
predominate soils and development density of the mobile home park.
Wastewater Treatment Plant Expansion Study

COMMUNITY SUBSURFACE SYSTEM
The Nature Trails Mobile Home Park does have an undeveloped, relatively flat area near
its entrance that could potentially be employed for wastewater disposal. This area is in a
broad floodway, and consists of Creedmoor type soils. Creedmoor soils are poorly
drained clayey soils with only limited potential for use with on -site disposal. It is
expected that if used for a subsurface treatment/disposal system, these soils could sustain
no more than 0.1 gallons per day per square foot, and possibly as little as 0.05 gallons
per day per square foot. Even using the higher value of 0.1 gallons per day per square
foot would require a disposal/treatment area of 400,000 square feet (9.2 acres) if a the
system were just built to handle the proposed 40,000 gallons per day of expansion, and
800,000 square feet if the system were built to handle the entire 80,000 gallons per day
of design flow. There is simply not this much undeveloped land available.
DRIP OR SPRAY IRRIGATION SYSTEM
Irrigation systems, because these types of systems utilize the most biologically active and
most easily reaerated top portion of the soil, offer potentially better treatment than sub-
surface systems. In additional, since such systems are typically built with extended
storage facilities for holding of wastewater during times when spraying is not feasible,
these systems can still be considered for use on land where flooding occurs, as long as ^ n )
the flooding is infrequent and not extended in duration. Land area requirements for such l�
systems, can, however, be extensive, depending on the type of soils available. Although p
071
SCS soils mapping has not yet been published for Chatham County, much of the workL� U rf
for the County has been done, and individual soils maps are available for the Nature 0
Trails Mobile Home Park area. These maps show that the only non -developed area, a
relatively flat, low area at the Park entrance, to be Creedmoor soils. A water balancee_l
these types of soils was performed to estimate the type of loading the soils could sustain.
This analysis is shown on the following page. An annual loading of only 17.0 in hes is
shown as being possible with the Creedmoor soils. This loading rate equates to an
acreage requirement, for a 40,000 gallon per day system, of 31.5 acres as shown below:
40,000 Ls- x 365 days
Acreage = `a'' ym = 31.53 acres
27,156 acmewchioce x 17.05 re- —
The acreage required for the full 80,000 gallons per day would be twice this amount, over
Wastewater Treatment Plant Expansion Study

63 acres. There is insufficient land available for either a 40,000 gallon per day or a
80,000 gallons per day land application system.
Water Balance - Creedmoor Soils Triangle Area
Water Losses Water ADnlied
Month
Evapo- Drainage Total Trecip-
Effluent
Total
Transpiration (inches) (inches) tation
Applied (inches)
Oct
2.1Y
2.81' 4.98
3.30
1.68-
4.98
Nov
1.50
2.81 4.31
3.62
0.69
4.31
Dec
0.93
2.81 3.74
4.45
0.00
4 47
Jan
0.93
2.81 3.74
4.10
0.00
4.10
Feb
1.68
2.81 4.49
4.44
0.05
TV
Mar
2.79
2.81 5.60
4.68
0.92
5.60
Apr
3.60
2.81 6.41
3.60
2.81
6.41
May
4.65
2.81 7.46
4.54
2.92
7.46
Jun
5.10
2.81 7.91
5.37
2.54
7.91
Jul
4.96
2.81 7.77
5.90
1.87
7.77
Aug
4.34
2.81 7.15
5.91
1.24
7.15
Sep
LO
281 §.Al
407
6.41
Total
36.25
33.72 69.97
53.99
17.05
71.04
Drainage
Rate Calculation:
Depth (inches) Water Loss %
volume) Drainage Per Cycle Inches
Top Horizon 8 inches
12.3%
0.984 inches
Basic Considerations: (1)
Irrigation Time
0.5 day
(2)
Drainage Time
7.0 day
(3)
Reaeratlon Time
31Q �y
Total Hydraulic Cycle Time
10.5 day
Drainage Rate, inch/month
= 30 days/monthx
0.984 inch/cycle = 2.81 inch/month
10.5 days/cycle
--
REUSE
The Nature Trails Mobile Home Park is a relatively densely developed residential
development in a hilly area. Where possible, existing vegetation (forest) has been left in
place. The slope, soils, and dense development present minimal opportunities for
landscape type irrigation as a reuse source. There are no centralized facilities that could
use reuse water for HVAC (heating, ventilating, and air conditioning) purposes. The
mobile homes themselves,, with their resident populations including a large number of
infants and children, are not good candidates for installation of gray water systems (i.e.
use of reuse water for toilet flushing, car washing, etc.). The adjacent development s part
of the Govenors's Club, which already employs reuse water wherever practicle.
Wastewater Treatment Plant Expansion Study 5

Therefore, reuse on -site and reuse off -site are not considered a viable alternatives to
discharge.
SURFACE WATER DISCHARGE THROUGH THE NPDES PROGRAM
The Nature Trails Mobile Home Park currently operates a wastewater treatment plant
discharging into Cub Creek. Cub Creek waters eventually discharges into B. Everett
Jordan Lake. An official with the North Carolina Division of Water Quality was
contacted regarding the feasibility of increasing the permitted discharge into Cub Creek.
That official advise that an increase in permitted flow would be possible, but an increase
in wasteload allocation would not be possible, and that any expanded plant should have
nitrogen and phosphorous removal capability. The planned increase in wastewater from
0.040 mgd to 0.080 mgd would therefore result in concentration based limits for critical
parameters that are half of the values contained within the existing permit. These limits,
while stringent, are within the bounds of what is technically achievable. Existing and
projected future limits are listed as follows:
Flow
BOD-5
TSS
NH3-N
(April 1 - October 31
NH3-N
(November 1 - March 31)
Fecal Coliform
Total Nitrogen
Total Phosphorous
0.040 mgd
0.080 mgd
17.0 mg/L 25.5 mg/L
8.5 mg/L
30.0 mg/L 45.0 mg/L
30.0 mg/L
2.0 mg/L -
1.0 mg/L
5.0 mg/L
2.5 mg/L
200/100m1 400/100 ml 200/100ml
- - 5.5 mg/L
2.0 mg/L
12.7 mg/L
45.0 mg/L
400/100 ml
Figure 2 is a schematic of the proposed wastewater treatment system. Each major
component of the system is described as follows:
Influent Pump Station: The existing influent pump station and basket screen will be kept
in service. The influent pumps will be increased in capacity to 167 ppm units.
Equalization/Anaerobic Reactor: The existing equalization basin will be kept in service
but modified. Mixers will be provided, and the return activated sludge will be rerouted to
flow through this tank, allowing the unit to serve as an anaerobic selector tank or- he
biological phosphorus removal prop. -The normal operation of the system will be for
the mam pumps to discharge into an elevated adjustable weir box. The weir will be
adjusted so that in normal operation the discharge from the wier box to a new treatment
Wastewater Treatment Plant Expansion Study
6

unit will be set to approximate the sum of the then current average daily influent flow
flow and the return activated sludge flow. Wastewater pumped in excess of flow rate will
be returned to the Equalization/Anaerobic Reactor tank. Float levels for pump control will
be set so that 2 to 4 hours retention time (based on the then current approximate value of
the average daily flow) will be achieved in the tank. If flow levels rise above the 4 hour
retention time level, then a second pump will come on. This second pump will discharge
directly into the elevated weir box discharge line so that none of the second pump
discharge is routed back to the Equalization/Anaerobic Reactor tank. A total of 3 pumps
will be provided, so that with one pump out of service, up to 222 M can be effectively
discharged from the Equalization/Anaerobic Reactor tank.
Anoxic Reactors.: -Dual anoxic reactors will be provided with a combined volume of
approximately 13,300 gallons. These reactors will be compartments in a new painted
steel treatment unit. The anoxic reactor compartments will have mixers, and in addition to
the influent will receive mixed liquid recycled from the adjoining aerobic reactor
compartments (aeration basins).
Aeration Basins: The same new painted steel treatment unit that houses the anoxic
reactors will contain dual aeration zones (aerobic reactors) with a combined volume of
75,000 gallons. These reactors will be -equipped with fine bubble diffusers for aeration
and mixing. Pumps will also be provided in each basin to recycle up to 320,000 gallons
per day of nitrified mixed liquor from the aeration basin to the anoxic reactor zones.
Anoxic/Aeration Polishing Zones: The same new painted steel treatment unit will contain
at the effluent end small anoxic and aerobic polishing reactor zones totaling 5000
gallons. The anoxic zone will have mixers, while the aerated zone will have fine bubble
diffusers for aeration and mixing. Discharge from the final aeration zone will be
combined and directed to a new final clarifier.
Final Clarification: A new final clarifier will be provided. This unit be a center feed,
peripheral withdrawal unit will have a diameter of 20 feet, and a side water depth of 14
feet. The unit will have a rotating rake system for bottom sludge withdrawal, and a
rotating top arm for scum removal. A telescopic valve mounted in an exterior
compartment will be used for sludge removal and wasting. Return sludge will be routed
to the Equalization/ Anaerobic Reactor tank. Waste sludge and scum will be routed to the
existing aerobic digesters.
Tertiary Filters: Clarified effluent will be discharged to a package tertiary filter system.
A two filter cell unit with integrated clear well and mudwell will be used. A minimum of
66 square feet of -filter surface will be provided.
UV Disinfection: Filtered effluent will be directed to a new, package UV disinfection
treatment unit. This unit will connect to the existing effluent discharge weir box.
Sludge Digestion/Holding: The existing 15,000 gallons of sludge digestion and holding
will remain in service. In addition, all of the existing aeration basin capacity will be
available for sludge holding and digestion on an emergency basis. Contract sludge
disposal will continue to be utilized. .
Back-up Clarification: The existing two clarifier units will be kept available as back-up
units should it ever be necessary to remove the new clarifier from service for
maintenance. The existing clarifiers will not, however, be used under ordinary conditions.
Back-up Phosphorous Removal: A tote type alum feed system (using sodium aluminate,
so that pH adjustment will not be necessary) will be used as a backup for the biological
Wastewater Treatment Plant Expansion Study

phosphorous removal system. This will alleviate need for providing dual units for the
Equalization/Anaerobic Reactor tank.
FH3uNrT
Fkow SC>*MATIC, PPoiWAFD
i1LAiMENt VVNr CAVAMMW
Wastewater Treatment Plant Expansion Study

ALTERNATIVE COMPARISONS AND COST
It is customary in an Engineering Cost Analysis to perform a cost-effective analysis of
the alternatives. However, in the case of the Nature Trails Mobile Home Park (Nature
Trails MHP) this is not possible, since only one of the alternatives is technically feasible.
There are no other surface discharge plants to which Nature Trails MBF could connect.
On -site treatment of any type is not possible due to the limited available land area, and
poor quality of soils on that land area. Therefore, the only viable alternative is expansion
and upgrading of the exiting surface discharge system. The projected cost for this
,.....4..«., :-
'Upgrade Influent Lift Station $20,000
Modify Existing Equalization Weir Box $7,000
Modify Existing Equalization Pumps $15,000
New Package Treatment Units*
Equipment & Basic Installation $3301,000
Base Slabs $45,000
Package UV Disinfection
Equipment $15,000
Equipment Installation $5,000
Back -Up Chemical Feed System $5,000
Piping and Site Work $7%560
Electrical $44,200
Standby Generator $50,000
Sub -Total $615,760
Contingency $61,576
Engineering $34,664
Total $712,000
* Painted steel tank with multiple anoxic <<nd aerobic zones, package tertiary filters
Wastewater Treatment Plant Expansion Study

SiJNIlVIARY
Nature Trails Mobile Home Park (MHP) wishes to approximately double the number of
additional housing units so that it can better serve the demand for affordable housing for
low and moderate income people in the Triangle Area. In doing so the amount of
wastewater that will be generated in the development will increase to 80,000 gallons per
day. Alternatives were evaluated for handling this 40,000 increase in flows above present
permitted capacity. No existing treatment systems are available to which this discharge
could be directed. A privately owned system is nearby, but the entire capacity of this
system is needed to met the needs of its owners. The City of Durham operates the
nearest publicly owned treatment system, but connection for it is not viable for three
reasons:(1) the distance(8 miles) involved; (2) the Nature Trails MHP management does
not have the legal authority required to secure the necessary rights -of -way for the
transportation lines that would be needed to convey its wastewater to the Durham facility,
and; (3) the City of Durham is unlikely to give up any capacity to serve a private
development located well outside of its jurisdiction, and in another County. Land
application systems, both subsurface and surface, were evaluated, and it was found that
the Nature Trails Mobile Home Park did not have available anywhere near the land area
required for such systems. The nature of the development at Nature Trails Mobile Home
Park is such that there are is no viable alternative available to it to reuse treated
wastewater, leaving Nature Trails Mobile Home Park with only one alternative, expansion
of its wastewater treatment system and discharge. An expansion alternative has been
developed that will allow Nature Trails Mobile Home Park to expand the treatment plant
with no increase in its wasteload allocation from the State, to virtually eliminate its
dependence on the oldest portions of its treatment system, and to meet the nutrient limits
expected to be imposed with any wastewater treatment system expansion. The projected
cost of these improvements is $712,000.
Wastewater Treatment Plant Expansion Study 10

SOC PRIORITY PROJECT: Yes: No: x
If Yes, SOC No.:
NPDES STAFF REPORT AND RECOMMENDATIONS
FOR NATURE TRAILS MHP
Date:2/26/02
To: Water Quality Section
NPDES Permitting Unit
Attention: Charles Weaver
County: Chatham
Permit No.: NCO043257
PART I - GENERAL INFORMATION
1. Facility and Address: Nature Trails MHP
101 Nature Trails
Chapel Hill, NC 27514
2.
3.
4.
5.
9
7
Date of Site Visit: 2/21/02
Report Prepared by: Bob Mangum
MAR 14 2002 U
I
Persons Contacted and Telephone Number: Mathew Raynor-919-217-0036
Directions to Site: US 15-501 South of Chapel Hill,
left on SR 1008, facility is on the right app. 2.5 miles.
Discharge Point(s), List for all discharge points:
Latitude: 35' 51' 32"
Longitude: 79 ° 01' 51"
Attach a USGS map extract and indicate treatment facility site and discharge point
on map.
U.S.G.S. Quad No.: D22SE U.S.G.S. Quad Name: Farrington
Site size and expansion area consistent with application? Yes: x
No: If No, explain:
Non -Discharge Staff Report
Page 1

o_
8. Topography (relationship to flood plain included): WWTP appears to be above
flood plain, surrounding area is flat and low.
9. Location of nearest dwelling: app.1000 ft.
10. Receiving stream or affected surface waters: Cub Creek
a. Classification: WS-IV NSW
b. River Basin and Subbasin No.: 03 06 06
C. Describe receiving stream features and pertinent
downstream uses: Jordan Lake is downstream
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of Wastewater to be permitted: 0.040 MGD
b. What is the current permitted capacity of the Waste Water Treatment facility?
.04 MGD
C. Actual treatment capacity of the current facility (current design capacity)?
.04 MGD
d. Date(s) and construction activities allowed by previous Authorization to
Construct issued in the previous two years:n/a
e. Please provide a description of existing or substantially constructed
wastewater treatment facilities: influent pump station -equalization basin -
flow splitter box -aeration basins -dual clarifiers -aerobic sludge digesters -
tertiary sand filters -effluent chlorination -flow monitoring
f. Please provide a description of proposed wastewater treatment facilities: n/a
g. Possible toxic impacts to surface waters: NH3 chlorinated effluent
h. Pretreatment Program (POTWs only):
in development: approved:
should be required: not needed: n/a
2. Residuals handling and utilization/disposal scheme:
a. If residuals are being land applied, please specify DEM permit no.:
Residual Contractor: Granville Farms
Telephone No.:
Non -Discharge Staff Report
Page 2

b. Residuals stabilization: PSRP:x
PFRP: Other:
C. Landfill:
d. Other disposal/utilization scheme (Specify):
3. Treatment plant classification (attach completed rating sheet):Class II
4. SIC Code(s): 6515
Wastewater Code(s) of actual wastewater, not particular facilities i.e.., non -contact
cooling water discharge from a metal plating company would be 14, not 56.
Primary: 08
Main Treatment Unit Code: 051-3
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant
Funds or are any public monies involved. (municipals
only)?n/a
2. Special monitoring or limitations (including toxicity) requests:none
3. Important SOC, JOC or Compliance Schedule dates: (Please indicate)
Date
Submission of Plans and Specifications
Begin Construction
Complete Construction
4. Alternative Analysis Evaluation: Has the facility evaluated all of the non -discharge
options available? Please provide regional perspective for each option evaluated.
Spray Irrigation:n/a
Connection to Regional Sewer System:n/a
Subsurface:n/a
Other disposal options: none
5. Other Special Items:
Non -Discharge Staff Report
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c
PART IV - EVALUATION AND RECOMMENDATIONS
The Raleigh Regional Office has received the submittal package requesting renewal of the
subject NPDES Permit. All submitted material has been reviewed by this office and a site
visit has been also been performed. Therefore, this office has no objection to the renewal
of this permit.
Signature of report
2/��/62—
Date
Water Quality Regional Supervisor Date
Non -Discharge Staff Report
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