NC0074233_Permit Modification_19950920

State of North Carolina
Department of Environment,
Health and Natural Resources 4�
Division of Environmental Management A
James B. Hunt, Jr., Governor IL
Jonathan B. Howes, Secretary p E 1--1 N FTL
A. Preston Howard, Jr., P.E., Director
September 20, 1995
Dr. Emmett M. Floyd
P. O. Box 100
Newton, North Carolina 28658
Subject: NPDES Permit Modification
NPDES Permit No. NCO074233
Catawba Co. Blackburn Middle Sch
Catawba County
Dear Dr. Floyd:
On July 24, 1995, the Division of Environmental Management issued NPDES Permit
No. NCO074233 to the Catawba County Board of Education. A review of the permit has
indicated that an error was inadvertently made in the permit. Accordingly, we are
forwarding herewith modifications to the subject permit to correct the error. These permit
modifications are to the effluent pages. The requirement for monitoring dissolved oxygen
in the effluent has been removed from the permit.
Please find enclosed the amended effluent sheets which should be inserted into your
permit. The old pages should be discarded. All other terms and conditions contained in the
original permit remain unchanged and in full effect. These permit modifications are issued
pursuant to the requirements of North Carolina General Statutes 143-215.1 and the
Memorandum of Agreement between North Carolina and the U. S. Environmental
Protection Agency.
If you have any questions concerning these permit modifications, please contact
Mr. Charles Alvarez at telephone number [phone], extension 553.
Sincerely,
Preston Howard, Jr., P.E.
cc: Central Files
Mooresville Regional Office, Water Quality Section
Permits and Engineering Unit
Facility Assessment Unit
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

A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS SUMMER (April 1- October 31) Permit No. NCO074233
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
Discharge Limitations
Monitoring
Requirements
Measurement
Sample
*Sample
Monthly ygs Weekly Avg„
Daily Max Frequency
Type
Location
Flow
0.015 MGD
Weekly
Instantaneous
I or E
BOD, 5 day, 200C
30.0 mg/I
45.0 mg/I 2/Month
Grab
E
Total Suspended Residue
30.0 mg/l
45.0 mg/I 2/Month
Grab
E
NH3 as N
6.0 mg/I
2/Month
Grab
E
Fecal Coliform (geometric mean)
200.0 /100 ml
400.0 /100 ml 2/Month
Grab
E
Total Residual Chlorine
Weekly
Grab
E
Temperature
Weekly
Grab
E
* Sample locations: E - Effluent, I - Influent
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.

A. (). EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS WINTER (November 1 - March 31) Permit No. NCO074233
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
Discharge Limitations
Monitoring_
Measurement
Requirements
Sample
*Samg_le
MonthlyAy_g.
Weekly Avg. Daily Max
Frequency
Type
Location
Flow
0.015 MGD
Weekly
Instantaneous
I or E
BOD, 5 day, 20°C
30.0 mg/I
45.0 mg/I
2/Month
Grab
E
Total Suspended Residue
30.0 m g/ I
45.0 m g/ I
2/Month
Grab
E
NH3 as N
12.0 mg/I
2/Month
Grab
E
Fecal Coliform (geometric mean)
200.0 /100 ml
400.0 /100 ml
2/Month
Grab
E
Total Residual Chlorine
Weekly
Grab
E
Temperature
Weekly
Grab
E
* Sample locations: E - Effluent, I - Influent
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.