WQ0016423_More Information (Requested)_19990322

State of North Carolina
Department of Environment NQ.U*WA
and Natural Resources 4
Division of Water Quality — 6, 2
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary NCDENR
Kerr T. Stevens, Director NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT FA6N
March 22, 1999RE
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�l a� 2 4 1999
Gray Walls
Town of Troy FA,YETTEVILL.E
444 North Main Street REG. OrME
Troy, North Carolina 27371
Subject: Permit No. WQ0016423
Town of Troy
Poole Road Subdivision
Sewer Extension
Montgomery County
Dear Mr. Walls:
The Non -Discharge Permitting Unit has completed a preliminary engineering review of
the subject application. Additional information is still required. Please address the following by
April 22, 1999:
1. Please us Application FORM: GSPSA 02/95 for future projects.
2. The flow rate for a 3-bedroom residential home in accordance with 15A NCAC 2H .0200 is
360 GPD. Please provide the number of residential units and the correct flow calculation.
3. Please revise your Pump calculations based on the new flow rate if needed.
4. Regulation 15A NCAC 2H .0209 (h) (2) requires that the pump-on/pump-off elevations be
set such that 2-8 pumping cycles per hour may be achieved in the pump station at average
flow. If extended detention times are necessary due to phased development, the need for
odor and corrosion control must be evaluated by the applicant. According the Division's
calculations, there are less than 2 pumping cycles per hour. Please clarify your calculations
and resubmit information concerning the average daily flow to the pump station and verify
that number of pumping cycles per hour is within the allotted range. If the minimum number
of pumping cycles per hour cannot be met, odor and corrosion control measures must be
addressed.
5. Please submit the following item:
♦ Buoyancy calculations for the pump station
6. Regulation 15A NCAC 2H .0219 (h) (3) requires that at least one of the following shall be
required for pump stations:
(A) telemetry systems with sufficient numbers of standby generators and
personnel for distribution or;
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(B) where the waters that would be impacted by a power failure are classified
as C, the applicant may be allowed to show a history of power reliability
that would demonstrate that an alternative power source or other reliability
measures would not be needed.
Please provide information on the number of pump stations or other devices the
emergency generator will be expected to service, verification the generator can be
moved between devices it must service in a way that prevents overflow of any
served pump stations, the number of personnel available to respond to a power
outage, and the time required to respond to an alarm.
7. The Division suggests placing the alarm float at the same level or below the lag float in the
pump tank in order to further prevent the possibility of overflow at the station. Please
consider this additional step in case of pump failure.
8. The plans do no specify the material to be used for the pump guide rails and lifting chain.
The Division has concern galvanized metals will corrode in a few years and make pump
removal very difficult. Please consider stainless steel for this purpose.
9. Please provide a plan of the pump station site showing at a minimum the f ollowing:
a. In accordance with regulation 15A NCAC 2H 0219 (h) please confirm there is restricted
access to and at the site and equipment.
b. In accordance with regulation 15A NCAC 2H .0219 (h), please confirm there is restricted
access by a hasp lock to the covers on the pump equipment.
c. In accordance with regulation 15A NCAC 2H .0219 (h), please confirm there is restricted
access by security fencing.
d. In accordance with regulation 15A NCAC 2H .0219 (h), please confirm there is area
lighting.
Please reference the subject permit application number when providing the requested
information. All information should be signed, sealed, and submitted in duplicate to my
attention at the address below. Please note that failure to provide this additional information on
or before the above requested date can result in your application being returned as incomplete.
If you have any questions regarding this request, please call me at [phone],
extension 533. Thank you for your cooperation.
Sincerely,
Ron Palumbo
Non -Discharge Permitting Unit
cc: Fayetteville Regional Office, Water Quality
Permit File WQ0016423
Central Carolina Engineering, PA