NC0029602_Authorization to Construct_20030214

State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
Alan W. Klimek, P.E., Director
Dr. Barbara R. Todd
Yadkin County Board of Education
121 Washington Street
Yadkinville, North Carolina 27018
Dear Dr. Todd:
AVA
NCDENR
February 14, 2003
Subject: Authorization to Construct
ATC No. 029602A02
NPDES Permit No. NC0029602
Forbush Elementary WWTP
Yadkin County
The Division of Water Quality's NPDES Unit has reviewed your request for an Authorization to Construct
(ATC) at the Forbush Elementary WWTP and finds the proposed improvements to be satisfactory and hereby
grants authorization the installation of a 40 gpm UV unit to be used for disinfection. It is the understanding
of the Division that the existing chlorinationldechlorination disinfection system will be retained on site in
case any extended maintenance is required for the UV unit.
This Authorization to Construct is issued in accordance with NPDES Permit No. NC0029602, issued
December 15, 2000, and shall be subject to revocation unless the wastewater treatment facilities are
constructed in accordance with the terms and conditions of the permit. This ATC in no way affects
the permitted flow of 0.006 MGD.
The Permittee shall notify the Water Quality Supervisor of the Winston-Salem Regional Office, telephone
number [phone], at least forty-eight (48) hours prior to operation of the installed facilities, so that an
in -place inspection can be made. Notification shall be made during the normal office hours of 8:00 a.m. until
5:00 p.m., Monday through Friday.
Engineer's Certification
Upon completion of construction and prior to operation of the modified facility, the Permittee shall provide
the Division with a certification (copy enclosed) from a professional engineer registered in North Carolina
certifying that the permitted facility has been installed in accordance with the NPDES Permit, this
Authorization to Construct, and the approved plans and specifications. The Certification should be submitted
to: NCDENR / DWQ, NPDES Unit, 1617 Mail Service Center, Raleigh, North Carolina 27699-1617.
Requirements for Certified Operator
The Permittee shall employ a certified wastewater treatment plant operator to be in responsible charge (ORC)
of the wastewater treatment facilities. The operator must hold a certificate of the type and grade at (east
equivalent to or greater than the classification assigned to the wastewater treatment facilities by the
Certification Commission. The Permittee must also employ a certified back-up operator of the appropriate
type and grade to comply with the conditions of Title 15A, Chapter 8G, .0200. The ORC of the facility must
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Telephone [phone] FAX [phone]
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Forbush Elementary WWTP
NPDES Permit No. NC0029602
ATC No. 029602A02
Page 2
visit each Class I facility at least weekly and each Class II, III, and IV facility at least daily, excluding
weekends and holidays; and must properly manage and document daily operation and maintenance of the
facility and comply with all other conditions of Title 1 SA, Chapter 8G, .0200.
Additional Requirements
The Operational Agreement between the Permittee and the Environmental Management Commission is
incorporated herein by reference and is a condition of this Permit. Noncompliance with the terms of the
Operational Agreement shall subject the Permittee to all sanctions provided by G. S. 143-215.6 for violation
of or failure to act in accordance with the terms and conditions of this Permit.
Failure to abide by the requirements contained in this Authorization to Construct may subject the Permittee
to an enforcement action by the Division of Water Quality in accordance with North Carolina General Statute
143-215.6A to 143-215.6C.
The issuance of this Authorization to Construct does not preclude the Permittee from complying with any and
all statutes, rules, regulations, or ordinances which may be imposed by other government agencies (local,
state, and federal) which have jurisdiction.
The Permittee shall maintain a copy of the approved plans and specifications on file for the life of the
facility. One (1) copy of the approved plans and specifications is enclosed for your records.
If you have any questions about this Authorization to Construct, please contact Natalie Sierra, at (919) 733-
5083, extension 551.
Sincerely,
/6(4,-•
&Alan W. Klimek, P.E.
Enclosures: Project Plans and Specifications (approved)
Engineer's Certification Form
cc: Winston-Salem Regional Office, Water Quality
Technical Assistance and Certification Unit
Central Files
NPDES Unit Files
Mr. John F. Philips, P.E. — Diehl & Phillips, P.A.
219 East Chatham Street
Cary, North Carolina 27511

ATC REVIEW NOTES
Facility status: Existing
Wastewater source: Domestic
Chronology:
APP RECD 11/04/02
ACKNOWLEDGED 11/15/02
STAFF RPT REQS 11/15/02
STAFF RPT RECD
Submissions:
• Letter of Transmittal
• Engineering Plans
• Equipment Vendor Specification Sheets
• Engineering Specifications
UV System
Number of modules: one
Number of lamps/module: two
Transmittance: 75%
Capacity: 57.600 gallons per day (40 gpm)
Channel type: Stainless steel
Forbush Elementary WWTP
ATC No. 029602A02
Yadkin County
REVIEWED 02 / 03/03
SCH TO ISSUE 03/12/03
ISSUED
The UV unit will be cut into the existing gravity flow effluent line. The system has been sized to be
compatible with the pumping rate at the plant (peak=10.4 gpm). Additional UV lamps, sleeves and
holders will be kept on site. The system will be interfaced with the existing alarm system such that
the ORC will be alerted when the UV intensity is insufficient to meet permit limits. In the event of
a power outage or other problems with the units, the ORC has the option of switching over to
chlorination/dechlorination to achieve disinfection. Loss of power at this plant results in the flow
being contained it the equalization basin. Since the school is on a well system, flow to the plant
would be limited in the case of a prolonged power outage.
The proposed unit meets the minimum design requirements for a facility of this size as it is based
on a peaking factor of nearly 10.
Compatibility with existing equipment: The proposed project is compatible with the existing
treatment system and will allow the facility to meet its TRC and fecal coliform limits.
Recommendations
I recommend that the Authorization to Construct be issued for the installation of a UV disinfection
system.
Page 2

ATC SUMMARY
SCOPE
The scope of the project includes the installation of an ultra-vfolet (UV) disinfection system.
Yadkin County Schools
!Forbush Elementary School WWTP
Southwest of Enon, NC
ATC No. 0029602A02
Logan Creek, Class WS-IV
Yadkin River Basin, 030702
Yadkin County
RECOMMENDATIONS
Approve installation of a UV disinfection system capable of disinfecting a
peak flow of 200,000 gpd (with one unit out of service). The system will be
equipped with a UV sensor connected to the existing audio/visual alarm
system to alert the ORC if the unit is not performing properly.
SUMMARY
Executive Summary
NPDES permit NC0029602 for the subject facility was issued on December 15, 2000. The
treatment works currently consist of:
• Equalization basin
• Dual aeration basins
• Dual clarifiers
• Dual sludge holding tanks
•Tablet chlorination
• Dechlorination
• Flow measuring device
The existing permit contains limits for both fecal coliform and total residual chlorine. The
installation of the proposed UV system should allow Forbush Elementary WWTP to consistently
meet these limits. The proposed system also conforms with the NPDES Unit's UV guidance.
•
Project Name: Addition of UV Disinfection Units
t
Applicant: Dr. Barbara R. Todd
Yadkin County Board of Education
121 Washington Street
Yadkinville, North Carolina
Application/Plans Prepared by:
John Phillips, P.E.
• Diehl & Phillips, P.A.
Cary, North Carolina
Project Location:
• Forbush Elementary WWTP
1400 Bloomtown Road
, southwest of Enon, North Carolina
Yadkin County
Pagel

Mr. John F. Phillips, P.E.
Diehl & Phillips, P.A.
219 East Chatham Street
Cary, North Carolina 27511
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
July 31, 2002
Subject: Authorization to Construct Applications
ATC Numbers: 071773A01, 029602A01, 029611A01
Permit Numbers: NC0071773, NC0029602, NCO29611
Yadkin County Schools
Return # 2169
Dear Mr. Phillips:
In accordance with Division policy, we must hereby return the attached Authorization to Construct (ATC)
application. After a preliminary review by a member of the NPDES staff, the Division has determined that the ATC
package lacks the following items:
• Relevant calculations for UV transmissivity, pumps and pump curves
• Manufacturers specifications for UV units
• Specifications for pumps
• Construction sequence
• Any additional information you can provide about proposed on -site operation of the UV system.
Attached please find one copy each of our UV system and ATC guidance to assist you in your resubmittal. If
you have any questions or comments concerning this draft permit, please contact Natalie Sierra at the [phone]
extension 551 or via e-mail at: [e-mail].
cc: NPDES Unit Files
Winston-Salem Regional Office/Water Quality Section
Dr. Barbara Todd - Yadkin County Board of Education
121 Washington Street
Yadkinville, North Carolina 27018
Sincerely,
4 (A_
David A. Goodrich
NPDES Unit Supervisor
North Carolina Division of Water Quality
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
[phone]
FAX [phone]
On the Internet at htto://h2o.enr.state.nc.us/
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Customer Service
1 800 623.7748