NC0037508_NPDES Permit Renewal_20140311

DIVISION OF WATER QUALITY
March 11, 2014
MEMORANDUM
TO: Tom Belnick
NPDES Permitting Unit
FROM: Mark Brantley, Environmental Senior Specialist
Fayetteville Regional Office of the Division of Water Resources
THROUGH: Belinda S. Henson, Regional Supervisor
Water _Quality Regional Operations Section, Fayetteville Regional Office
SUBJECT: Application for NPDES Permit NC0037508
Moore County Water Pollution Control Plant
1094 Addor Road
Aberdeen, NC 28315
Moore County
Please find enclosed a staff report and recommendations from the Fayetteville Regional
Office concerning the application for a new NPDES Permit.
If you have any questions or require any further information, please advise.
/KMB
Enclosures

To: NPDES Permitting Section
Attention: Tom Belnick
Date: March 11, 2014
NPDES STAFF REPORT AND RECOMMENDATION
COUNTY: Moore
Permit No.: NC0037508
PART 1— GENERAL INFORMATION
1. Facility and Address: Moore County Water Pollution Control Plant
1094 Addor Road
Aberdeen, North Carolina 28315
2. Date of Investigation: February 21, 2014
3. Report Prepared by: Mark Brantley, Environmental Senior Specialist, FRO
4. Person Contacted and Telephone Number:
George Yankay, System Superintendent [phone]
5. Directions to Site:
From Fayetteville, travel on Hwy 401, turn right onto Hwy 211 North, turn left at Army
Road, travel straight and cross Hwy 15/501, turn right onto Addor Road, and turn left at
the entrance to the Moore County Water Pollution Control Plant.
6. Site size and expansion area consistent with the application?
Yes.
7. Topography (relationship to the flood plain): Not evaluated
8. Location of the nearest dwelling: Not evaluated
9. Receiving stream or affected surface waters:
a. Classification: Little River Class C
b. River Basin No. Lumber River 03-07-50 and Sub basin No.: LUM50
c. Describe receiving stream features and the pertinent downstream uses:
It is classified as Class C waters, which promotes aquatic life propagation and
survival, fishing, wildlife, secondary recreation, and agriculture.

PART II - DISCRIPTION OF WASTES AND TREATMENT WORKS
1. a. Volume of wastewater to be permitted:
10.0 MGD (Ultimate Design Capacity)
b. What is the current permitted capacity of the Wastewater Treatment facility?
6.7 MGD
d. Actual treatment capacity of the current facility (current design capacity)?
10.0 MGD
e. Please provide a description of the existing or substantially constructed
wastewater treatment facility:
This facility has recently completed a construction project that will increase its
treatment capacity from 6.7 MGD to 10.0 MGD. A third train was added to the
plant including a new primary clarifier, intermediate clarifier, final clarifier, a
first stage aeration basin, and a new second stage aeration basin.
The following are additional changes that have been made since the last issuance
of the permit:
1. UV disinfection was installed and chlorination/dechlorination systems were
removed from operation.
2. Sand filters were added prior to UV
3. New generators were installed
4. A second primary digester was constructed.
5. Two sludge presses were added for thickening and dewatering purposes.
6. Drying beds are used for pressed sludge stockpile only at this time.
Below is a basic description of how wastewater flows through the WWTP:
Raw wastewater flow enters the headworks of the plant through an influent pump
station with four dry pit submersible pumps and two mechanical bar screens.
The flow is pumped to the grit removal unit. The settled grit is pumped from the
bottom of each chamber by two grit pumps, and into the grit washer. The grit
slurry is then dewatered. A screw conveyor carries the grit to a container located
outside the grit unit. The grit that is collected is sent to the landfill. Wastewater
from the grit unit flows over a wier into the discharge line ensuring a grit free
discharge to the primary clarifiers. Settled solids from the primary clarifiers are
mechanically collected for pumping to the anaerobic digesters. In the primary
clarifier, a skimmer attached to the arm collects scum from the surface and drops
it into a scum box that drains outside the tank wall. The primary sludge from the
primary clarifier is pumped directly to the anaerobic digesters. The primary
clarifier effluent flows to the First Stage Aeration Basins (separated into

rectangular compartments with diffused air). The mixed liquor is continuously
transferred to the Intermediate Clarifiers for gravity separation and is returned to
the First Stage aeration basins with the excess going to the anaerobic digesters.
The effluent from the Intermediate Clarifiers enters the Second Stage Aeration
Basins, and later flows to the Final Clarifiers. The settled sludge in the Final
Clarifiers is returned to the Second Stage Aeration Basins, with excess going to
the anaerobic digesters. Effluent from the Final Clarifiers flows to the new sand
filter unit. This is followed by UV disinfection. The sludge from the two
anaerobic digesters is run through the filter press and is.stored on the drying beds
until it is disposed of through composting at McGill Environmental or is disposed
of through a landfill.
f. Possible toxic impacts to the surface waters:
None
2. Residuals handling and utilizing/disposal scheme:
a. If residuals are being land applied, please specify the DWQ Permit No. N/A
Residual Contractor: N/A
Telephone: N/A
b. Residual stabilization: N/A
c. Landfill: N/A
g.
Other disposal/utilization scheme (specify):
3. Treatment plant classification (attach completed rating sheet):
4. Alternative Analysis Evaluation: Has the facility evaluated all of the non -discharge
options available: Please provide the regional perspective for each of the options that
were evaluated.
Connection to Regional Sewer System:
Land Application: none evaluated
Water`Reuse: none evaluated

PART IV — EVALUATION AND RECOMMENDATIONS
1. The applicant is requesting that the NPDES permit be reissued at a flow rate of 10.0
MGD.
2. A review of the compliance data did not reveal any significant violations. A by-pass
occurred last June due to an extreme heavy rainfall event. A few minor violations
occurred during the construction phase and the FRO believes those activities were the
cause of the violations.
3. This Office recommends continuation of the Special Conditions for the Whole Effluent
Toxicity monitoring and the Pretreatment Program.
4. Based upon the above information, this Office recommends reissuance of the said permit.
NOTE: An Engineer's Certification for the upgrade has not been received in the regional
office. We' are not sure if it has been received in the central office.