NC0043257_Permit Issuance_19960401

Permit No. NCO043257
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT, HEALTH, AND NATURAL RESOURCES
DIVISION OF ENVIRONMENTAL MANAGEMENT
PER
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision 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,
Nature Trail Associates
is hereby authorized to discharge wastewater from a facility located at the
Nature Trails Mobile Home Park
101 Nature Trails
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.
The permit shall become effective May 1, 1996.
This permit and the authorization to discharge shall expire at midnight on March 31, 2001.
Signed this day April 1, 1996.
Original Signed By
®avid A. Goodrich
A. Preston Howard, Jr., P.E., Director
Division of Environmental Management
By Authority of the Environmental Mangement Commission

Permit No. NCO043257
SUPPLEMENT TO PERMIT COVER SHEET
Nature Trail Associates
is hereby authorized to:
1. Continue to operate a 0.040 MGD extended aeration wastewater treatment plant consisting of an
influent pump station, aeration basins, dual clarifiers, aerobic sludge digestors, tertiary sand
filters, chlorination equipment, and effluent measurement devices located at Nature Trails Mobile
Home Park, 101 Nature Trails, Chapel Hill, Chatham County (See Part III of this Permit), and
2. Discharge from said treatment works at the location specified on the attached map into Cub
Creek which is classified Class WS-IV NSW waters in the Cape Fear River Basin.

A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL Permit No. NCO043257
During the period beginning on the effective date of the permit and lasting until March 31, 1997, the Permittee is authorized to discharge from
outfall(s) serial number 001. Such discharges shall be limited and monitored by the permittee as specified below:
Effluent Characterlstics
Flow
BOD, 5 day, 200C
Total Suspended Residue
NH3 as N
Dissolved Oxygen"
Fecal Coliform (geometric mean)
Total Residual Chlorine
Temperature
Conductivity
Total Nitrogen (NO2+NO3+TKN)
Total Phosphorus
e u -t=
Monthly Avg.
0.040 MGD
17.0 mg/l
30.0 mg/l
5.0 mg/I
200.0 /100 ml
Weekly Avg. gay MOX
25.5 mg/l
45.0 mg/I
400.0 /100 ml
Monitoring Requirements
Measurement
SaMDle
*29mR1e
Frequency
Tyne
Location
Continuous
Recording
I or E
Weekly
Composite
E
Weekly
Composite
E
Weekly
Composite
E
Weekly
Grab
E, U, D
Weekly
Grab
E,U,D
2/Week
Grab
E
Weekly
Grab
U,D
Weekly
Grab
E,U,D
Quarterly
Composite
E
Quarterly
Composite
E
* Sample locations: E - Effluent, I - Influent, U - Upstream, D - Downstream 1.2 miles.
** The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/l.
The pH shall not be less than 610 standard units nor greater than 9.0 standard units and shall be monitored weekly at the effluent by grab
sample.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS FINAL Permit No. NC0043257
During the period beginning on the effective date of the permit and lasting until March 31,1997, the Permittee is authorized to discharge from
outfall(s) serial number 001. (Continued)
Effluent Characteristics Discharge Limitations Monitoring Reaulrements
Units (specify) Measurement Sample *Sample
Monthly Avg. Weekly Avg. Daily Max Frequency Type Location
Temperature Daily Grab E

A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS SUMMER (April 1 - October 31) Permit No. NCO043257 _
During the period beginning on April 1, 1997 and lasting until expiration, the Permittee is authorized to discharge from outfall(s) serial number
001. Such discharges shall be limited and monitored by the permittee as specified below:
Effluent Characteristics
Flow
BOD, 5 day, 20°C
Total Suspended Residue
NH3 as N
Dissolved Oxygen"
Fecal Coliform (geometric mean)
Total Residual Chlorine
Temperature
Conductivity
Total Nitrogen (NO2+NO3+TKN)
Total Phosphorus
Discharge Limitations
Monitoring
Requirements
Measurement
Sam ire
*SamRle
Monthly Avg. Weekly
Avg. DailyMax Frequency
=jape
Location
0.040 MGD
Continuous
Recording
I or E
17.0 mg/1
25.5 mg/I Weekly
Composite
E
30.0 mg/I
45.0 mg/i Weekly
Composite
E
2.0 m g / l
Weekly
Composite
E
Weekly
Grab
E. U, D
. 200.0 /100 ml
400.0 /100 ml Weekly
Grab
E,U,D
2/Week
Grab
E
Weekly
Grab
U,D
Weekly
Grab
E,U,D
Quarterly
Composite
E
Quarterly
Composite
E
* Sample locations: E - Effluent, I - Influent, U - Upstream, D - Downstream 1.2 miles
** The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/l.
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be monitored weekly at the effluent by grab
sample.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

j
A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS SUMMER (April 1- October 31) Permit No. NCO043257
During the period beginning on April 1, 1997 and lasting until expiration, the Permittee is authorized to discharge from outfall(s) serial number
001. (Continued)
Effluent Characteristics Discharge Limitations Monitorina3eaulrements
Units (specify) Mepsurement Sample "Sample
Monthly Avg. Weekly Avg. Daily Max Frequency Type Location
Temperature Daily Grab E

A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS WINTER (November 1- March 31)
Permit No. NCO043257
During the period beginning on April 1, 1997 and lasting until expiration, the Permittee is authorized to discharge from outfall(s) serial number
001. Such discharges shall be limited and monitored by the permittee as specified below:
Effluent Characteristics Discharge Limitations
Monitoring
Requirements
Measurement
Sample
*Samule
Monthly Avg. Weekly Avg, Daily Max
Frequency
Type
Location
Flow 0.040 MGD
Continuous
Recording
I or E
BOD, 5 day, 20°C 17.0 m g/ l 25.5 m g/ l
Weekly
Composite
E
Total Suspended Residue 30.0 mg/I 45.0 mg/l
Weekly
Composite
E
NH3 as N 5.0 mg/1
Weekly
Composite
E
Dissolved Oxygen"
Weekly
Grab
E, U, D
Fecal Coliform (geometric mean) 200.0 /100 ml 400.0 /100 ml
Weekly
Grab
E,U,D
Total Residual Chlorine
2/Week
Grab
E
Temperature
Weekly
Grab
U,D
Conductivity
Weekly
Grab
E,U,D
Total Nitrogen (NO2+NO3+TKN)
Quarterly
Composite
E
Total Phosphorus
Quarterly
Composite
E
*. Sample locations: E - Effluent, I - Influent, U - Upstream, D - Downstream 1.2 miles
** The daily average dissolved oxygen effluent concentration shall not be less than 5.0 mg/l.
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be monitored weekly at the effluent by grab
sample.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS WINTER (November 1- March 31) Permit No. NCO043257
During the period beginning on April 1, 1997 and lasting until expiration, the Permittee is authorized to discharge from outfall(s) serial number
001. (Continued)
Effluent_ Characteristics Discharge Limitations Monitoring Requirements
Units (sRecify) Measurement Samole 'SaMRIS
MonthlyAvg. Weekly Avg,. Daily Max Frequency TyQe Location
Temperature Daily Grab E

Part III
Permit No. NCO043257
E. Nutrient Condition for Pe its Without
This permit may be modified, or vc
for this discharge depending upon E
1. The findings of a study by the
control is necessary.
2. Local actions do not succ/tions
3. The onset of problem con
'hosphorus Limits
i reissued to include an effluent limitation on nutrients
ing.
n of Environmental Management determine nutrient
re ce the nutrient loading on the receiving waters.
in the eceiving waters.

Staff Review and Evaluation
NPDES Wastewater Permit
FACILITY JNFORMATION
Facility Nature Trails Mobile Home Park
NPDES No. NCO043257
Design Flow (MGD) 0.040
Facility Class II
STREAM CHARACTERISTICS
Stream Name
Cub Creek
Stream Class
WS-IV NSW
Sub -basin
030606
Drainage Area (mil)
2.9
S7Q10 (cfs)
0.075
W7Q10 (cfs)
0.2
30Q2 (cfs)
0.4 -
I (%)
45.26
Proposed Changes
Parameters Affected
Basis for change(s)
Monitoring Frequencies
TRC, PH
2B .0500 Regulations
Ammonia/WET limit
NH3-N changed to 2.0 mg/1
summer
Potential toxicity.
Winter Limits
NH3-N changed to 5.0 mg/1
winter
Potential toxicity
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Compliance Schedule: AL/� A�� �f d�M�' � �'M
Special Condition(s): NSW condition without phosphorus limits in Part III. /
Permits & Engineering Comments:
The discharge monitoring reports showed few violations for BOD5, ammonia and fecal
coliform, within the past 24 months. Upstream and downstream monitoring showed very
slight depletion levels in dissolved oxygen. Recommend existing limits with 2.0 mg/1
ammonia (summer) and 5.0 mg/1 ammonia (winter) and upgrade monitoring as per
regulations for class H facilites.
Prepared by:
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