NC0039331_Permit Issuance_19960530

.( State of North Carolina
r Department of Environment,
,+iealth and Natural Resources / •
Division of Environmental Management
James B. Hunt, Jr., Governor [D C
dft
G
Jonathan B. Howes, Secretary
A. Preston Howard, Jr., P.E., Director
May 30, 1996
Mr. Paul Joyce
Chatham County Schools
Post Office Box 128
Pittsboro, North Carolina 27213-0128
Subject: NPDES Permit Issuance
Permit No. NCO039331
Bonlee Elementary School
Chatham County
Dear Mr. Joyce:.
In accordance with the application for a discharge permit received on November 16, 1995, the Division is
forwarding herewith the subject NPDES 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 December 6,,1983.
This final permit includes two revisions to the draft permit:
1) The downstream instream monitoring location has been eliminated from the Bonlee Elementary School NPDES
permit. Instream monitoring shall be coordinated with Chatham Central High School. Bonlee Elementary and
Chatham Central High schools shall conduct instream sampling on the same days, but Bonlee Elementary School
shall monitor only at the upstream location and Chatham Central High School shall monitor only at the
downstream location.
2) Footnote number three on the Effluent Limitations and Monitoring Requirements page requires the installation
of dechlorination within 80 days of the effective date of the permit. A dechlorination system should ensure that
the facility meets its residual chlorine limit. Bonlee Elementary School will not be required to meet its residual
chlorine limit until after dechlorination installation.
In addition, the Division of Environmental Management solicits comments from various groups and agencies
pertaining to NPDES permits. The North Carolina Wildlife Resources Commission stated that Bear Creek several
miles downstream of the Bonlee Elementary School discharge provides habitat for the federally and state listed
Cape Fear Shiner. The Commission further stated that maintenance of Bear Creek's water quality is essential to
maintaining Shiner habitat and for providing opportunities for population recovery of this species.
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, Post Office Drawer 27447,
Raleigh, North Carolina 27611-7447. Unless such demand is made, this decision shall be final and binding.
Please take note that this permit is not transferable. Part II, EA. addresses the requirements to be followed
in case of change in ownership or control of this discharge.
This permit does not affect the legal requirements to obtain other permits which may be required by the
Division of Environmental Management or permits required by the Division of Land Resources'or any other
Federal or Local `governmental permit that may be required.
P.O. Box 29535, Raleigh,North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper

Mr. Joyce
May 30, 1996
Page 2
If you have any questions concerning this permit, please contact Paul B. Clark at telephone number
[phone], extension 580.
Sincerely,
Originals Signed By
ADWW tt ARE td, qr., P.E.
Enclosure
cc: Central Files
Raleigh Regional Office, Water Quality Section
Mr. Roosevelt Childress, EPA
Permits and Engineering Unit
Facility Assessment Unit

Permit No. NCO039331
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT, HEALTH, AND NATURAL RESOURCES
DIVISION OF ENVIRONMENTAL MANAGEMENT
PERMIT
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,
Chatham County Schools
is hereby authorized to discharge wastewater from a facility located at
Bonlee Elementary School
on NCSR 1139
Bonlee
Chatham County
to receiving waters designated as an unnamed tributary to Bear 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 July 1, 1996
This permit and the authorization to discharge shall expire at midnight on April 30, 2001
Signed this day May 30, 1996
Original Signed By
David A. Goodrich
A. Preston Howard, Jr., P.E., Director
Division of Environmental Management
By Authority of the Environmental Management Commission

IR
SUPPLEMENT TO PERMIT COVER SHEET
Chatham County Schools
is hereby authorized to:
Permit No. NCO039331
1. Continue to operate an existing 0.007 MGD wastewater treatment system consisting of a
2000 gallon pump tank with alarms, a meter box for recirculation, a sand filter distribution
manifold, a 4' x 4' aerator box with distribution manifold, a tablet chlorinator and a chlorine
contact chamber located at Bonlee Elementary School, -on NCSR 1139, Bonlee, Chatham
County (See Part III of this permit), and
2. Discharge wastewater from said treatment works at the location specified on the attached
map into an unnamed tributary to Bear Creek which is classified Class C waters in the Cape
Fear River Basin.

A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS
Permit No. NCO039331
During the period beginning on the effective date of the permit 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, 200C (April I - October 31)
BOD, 5 day, 200C (November 1 -March 31)
Total Suspended Residue
N113 as N (April 1 - October 31)
NH3 as N (November I - March 31)
Dissolved Oxygen 2
Fecal Coliform (geometric mean)
Total Residual Chlorine 3
Temperature
Temperature
Conductivity
Discharge Limitations
Monthly Avg. Weekly Avg.
Daily
Max.
0.007 MGD
5.0 mg/l
7.5
mg/l
10.0 mg/1
15.0
mg/1
30.0 mg/1
45.0
mg/1
2.0 mg/l
4.0 mg/1
200/ 100 ml 400/ 100 ml
0.028 mg/1
Monitoring
Requirements
Measurement
Sample
Sample
Frequency
Type
Location 1
Weekly
Instantaneous
I or E
2/month
Grab
E
2/month
Grab
E
2/month
Grab
E
2/month
Grab
E
2/month
Grab
E
Weekly
Grab
E, U
2/month
Grab
E, U
2/week
Grab
E
Daily
Grab
E
Weekly
Grab
U
Weekly
Grab
E, U
Footnotes:
1 Sample locations: I - Influent, E - Effluent, U - Upstream above the discharge point when there is flow. Instream monitoring shall be coordinated with
Chatham Central High School. Bonlee Elementary and Chatham Central High schools shall conduct instream sampling on the same days, but Bonlee
Elementary School shall monitor only at the upstream location and Chatham Central High School shall monitor only at the downstream location.
2 The daily average dissolved oxygen effluent concentration shall not be less than 6.0 mg/l.
3.. Dechlorination shall be installed within 80 days of the effective date of this permit.
The pH shall not be less than 6.0 standard units nor greater than 9.0 standard units and shall be monitored 2/month at the effluent by grab sample.
There shall be no discharge of floating solids or visible foam in other than trace amounts.

Staff Review and Evaluation
NPDES Wastewater Permit
FACILITY INFORMATION
Facility Chatham Co. Sch. - Bonlee Elementary School
NPDES No. NC0039331
Design Flow (MGD) 0.007 MGD
Facility Class I
STREAM CHARACTERISTICS
Stream Name
unnamed trib to Bear Creek
Stream Class
C (4/1/59)
Sub -basin
030612
Drainage Area (mil)
0.1
S7Q10 (cfs)
0.0
W7Q10 (cfs)
0.0
3Q2 (cfs)
13.0
IWC (%)
100%
Proposed Changes
I'arameters Affected
Basis for change(s)
2.0 m /1(sum) 4.0 m /I (win)
NH3-N
DEM Policy
Install dechlorination
C1
Compliance violations
Compliance Schedule: To be developed for dechlorination installation
Special Condition(s):
Permits & Engineering Comments:
1) Bonlee has not conducted their instream monitoring for at least the last two years (1994 -95). Bonlee
and Central High School both discharge to unnamed tributaries to Bear Creek. The tributary to which
Bonlee discharges is upstream of the tributary to which Central discharges (see attached map).
Monitoring could possibly be coordinated between these two facilities and could consist of one of the
following options: a) Both schools monitor up- and downstream on the same day each week or b) Both
schools monitor on the same day each week, but Bonlee monitors only upstream and Central monitors
only downstream. Please comment on this proposal.
2) Bonlee has had several chlorine, ammonia, and BOD violations during 1994 -95. The facility has
been experimenting with adding microbes to the grease trap for BOD reduction and is anticipating
process modifications during the summer of 1996, both of which will hopefully improve compliance.
3) Ammonia limits will change from 1.0 to 2.0 mg/1(summer) and from 1.8 to 4.0 mg/l (winter) as
recommended by a Division of Environmental Management policy change. All other effluent limits
will remain unchanged from the existing permit.
4) In an effort to reduce or eliminate chlorine violations, the permittee should install dechlorination
within 80 days oft effective date of a permit. Please comment .
Prepared by:
Regional Office Evaluation and Recommendations:

To: Permits and rgd-nee ing Unit
Water Qua,Yity Secti�o
Attention: ack Wigins
D to 12/19/
NPDES STAFF REPORT AND RECOMMENDATION
County Chatham
RENEWAL
Permit No. NC0039331
PART I - GENERAL INFORMATION
1. Facility and Address:Bonlee Elementary School
c/o Chatham County Schools
501 West. Street
Pittsboro, NC 27312
2. Date of Investigation:December 18, 1995
3. Report Prepared•by: Babette McKemie, P.E.
4. Persons Contacted and Telephone Number:Paul Joyce(919) _
542-3626 !
5. Directions to Site:S.R. 1139 at Bonlee
6.. Discharge Point(s), List for all discharge points:
Latitude: 35°38'33" Longitude:79°25'22"
Attach a USGS map extract and indicate treatment facility
site and discharge point on map.
U.S.G.S. Quad No. E21NW U.S.G.S. Quad Name Siler City
7. Site size and expansion area consistent with application ?
X Yes No If No, explain:
8. Topography (relationship to flood plain included) : f lat, not
in flood plain
9.
Location
of nearest
dwelling:within
250'
10.
Receiving
stream or
affected surface
waters:UT to Bear Creek
a. Classification:C
b. River Basin and Subbasin No.:03 06 12
C. Describe receiving stream features and pertinent
downstream uses:small stream with other SF
discharges and Central High School

• �----'__"� _��_-y--"�'� Nam.-n+.. --Y�� - .�'="'`i�a o�"'�_...._ -
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. a. Volume of Wastewater to be permitted: .007 MGD
(Ultimate Design Capacity)
b. What is the current permitted capacity of the Waste
Water Treatment facility?.007 MGD
C. Actual treatment capacity of the current facility
(current design capacity)?.007 MGD
d. Date(s) and construction activities allowed by previous
Authorization to Construct issued in the previous two years.:
none
e. Please provide a description of existing or
substantially constructed wastewater treatment facilities:
2000 gallon pump tank with alarms, meter box for
recirculation, sand filter distribution manifold, 4' x 4'
aerator box with distribution manifold, tablet chlorinator
and chlorine contact chamber
f. Please provide a description of proposed wastewater
treatment facilities: none proposed
g. Possible toxic impacts to surface waters:C12_.,`.-tom
h. Pretreatment Program (POTWs only):n/a
in development approved
should be required not neede—d
2. Residuals handling and utilization/disposal scheme:
septic tanks are pumped twice a year
3. Treatment plant classification (attach completed rating
sheet):Class I- no change
4. SIC Code,(s):8211
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 03 Secondary
Main Treatment Unit Code: 452-7

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:NH3 should go to 2 mg/1 per policy
3. Important SOC, JOC or Compliance Schedule dates: (Please
indicate)none
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:not available
Connection to Regional Sewer System:not available
Subsurface:inadequate soil
Other disposal options:
5. Other Special Items:
PART IV - EVALUATION AND RECOMMENDATIONS
The RRO has performed a site visit and reviewed the
compliance data. The facility has had a recirculating sand
filter since 199-1. Compliance is not consistent and the facility
has trouble nitrifying during the winter.. The facility is
experimenting with microbe addition in order to improve
compliance and is, anticipating process modifications during the
summer of 1996. 1'° 1,.;, t ?'e
fD
/ The NH3 limit should be 2.0 mg/l per DEM policy.
The RRO recommends renewal of the NPDES permit.
C
��7�01-,`'% .mil
i ignatufe of /report preparer
-;I- Water Qua V
ty gional Supervisor
L�Z�
Date
NC39331.SR