NC0060461_staff comments_19940908

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cc: Permits and Engineering
Technical Support Branch
County Health Department
Central Files
WSRO
SOC PRIORITY PROJECT: NO X
To:. Permits and Engineering Unit
Water Quality Section
Attention: Jay Lucus
AUTHORIZATION TO CONSTRUCT
NPDES PERMIT REPORT AND RECOMMENDATIONS
September 8, 1994
County: Forsyth
Permit No. NCO060461
PART I GENERAL INFORMATION
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1. Facility Name and Current Address: Mr. Carl Daniel, V.P.
Carolina Water Service
P. O. Box 240705
Charlotte, N.C. 28224
2. Date of most recent NPDES Staff Report: February 7, 1994 (See attached copy).
3. Changes since previous action on NPDES Permit: No changes have occurred since the
Permit was reissued on 5-31-94.
4. Verify Discharge Point on plans with current NPDES Permit.
Latitude: 36' 10' 08" Longitude: 80' 06' 00"
Attach a USGS map and indicate treatment facility site and discharge point on map.
U.S.G.S. Quad No. C-18-NE U.S.G.S. Name Belews Creek
5. Treatment plant classification: (See attached rating sheet) Class II (50 points)

PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
Existing treatment facility:
a. ,What is the current permitted capacity of the facility?
The existing permit issued on July 1, 1994, contains effluent pages with flow
limits of 0.1 MGD (current design) and 0.385 MGD (permitted capacity).
b. Construction activities allowed by previous Authorizations to Construct issued in
the previous two years: NA
c: What is the actual treatment capacity of the current facility (design volume)?
0.1 MGD based on the amended A/C issued 10-7-85.
d. Please provide a description of existing or substantially constructed wastewater
treatment facilities. The existing 0.10 MGD system consists of an influent pump
station, three aeration tanks (capacity of 100,000 gallons), a 17,870 gallon
clarifier, a 2,275 gallon chlorine contact tank with tablet chlorinator, a Stevens
flow measurement device, post aeration tank and a 7,630 gallon sludge holding
basin and standby generator.
2. Please provide a description of proposed wastewater treatment facilities: The proposed
0.2 MGD WWTP will consist of the following: 42,460 gallon equalization basin with
dual 173 GPM pumps, bar screen and flow splitter box, dual 100,000 gallon aeration
basins (total volume of 200,000) dual 22,829 gallon clarifiers (total volume of 45,658
gallons), tablet chlorinators, 4,167 gallon contact tank, dechlorination unit, 2000 gallon
post aeration chamber and Stevens flow recorder and standby generator.
3. Residuals handling and utilization/disposal scheme: The existing 50,000 gallon aeration
basin will be converted to an aerated sludge holding tank. An estimated 14,000 to 45,000
gallons of sludge will be hauled monthly to the Winston-Salem POTW's for disposal.
4. Important SOC, JOC or Compliance Schedule dates, if applicable: NA
PART III - EVALUATION AND RECOMMENDATIONS
This A/C request is for the expansion of the Abington WWTP from 0.1 MGD to 0.2
MGD. The existing WWTP will be taken out of service and a new 0.2 MGD package plant with
dual units will be constructed. The two 0.05 MGD aeration basins from the existing WWTP will
be converted into sludge holding and equalization units. The plans appear adequate, however,
the following concerns should be addressed by the applicant:

1) A construction sequence plan must be submitted for modification
of the existing WWTP to ensure continuous operation of the
system [See NCAC 02H .0138(b)(9)]. This is necessary since the
old aeration basin units will 'be converted to equalization and
sludge holding.
2) In regards to wetlands, the plans submitted show the relocation of
an existing creek to a rip rap lined channel to allow for the
construction of the new system. Therefore, Carolina Water Service
must contact Mr. John Thomas with the U.S. Army Corps of
Engineers, ph(919) 876-8441, to see if any 404/401 permits are
required. Documentation on the COE's determination should be
provided to DEM prior to the issuance of the A/C.
3) The third concern involves the fact that Abington's discharge pipe
is submerged in a ten acre beaver pond and cannot be located or
observed. Since there is no stream channel, the WWTP basically
discharges into a pond situation. Attached is a May 9, 1994, letter
from the Forsyth County Health Department, expressing concerns
about the possible exposure of humans to giardia. The Health
Department recommends that the discharge be relocated to a
flowing stream and that the Abington facility be combined with the
Kynwood facility (Note: Carolina Water Service holds the permit
for the 0.072 MGD Kynwood WWTP which is located 300 yards
from the Abington WWTP, but discharges 0.6 mile downstream of
the beaver pond.
Signature of report preparer
Water Quality Supervisor
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Date

HEALTH DEPARTMENT
Dr. Thomas R. Dundon
Director
May 9, 1994
of
O ;'uC
Division of Environmental
Health and Laboratory
Fred G. Overstreet
Director
[phone]
RECEIVED
N.C. Dept. of E� `NR
N.C. Department of Environmental Health & Natural Resources
Division of Environmental Management ��44
Mr. Mike Mickey
Suite 100 Wnsto-i-,-Salem
8075 North Point Blvd. Regional Office
Winston-Salem, NC 27106
Re: Abington Waste Water Treatment Plant
Dear Mr. Mickey:
Recently this Division learned that the above referenced facility may
be planning to expand, subsequently increasing its discharge to a tributary
of Belews Creek which crosses Vance Road, Kernersville, N.C.
This Division is concerned about any increase in flow at this facility
for the following reasons:
(1) Beavers have constructed a dam below the discharge pipe at this
facility subsequently creating a holding pond for the discharge as
opposed to discharging to a flowing stream;
(2) More flow/discharge will substantially create more mosquito
breeding habitat subsequently increasing the risks of arthropod -borne
disease;
(3) Beavers are a known reservoir for giardia. It seems reasonable
to believe that beavers living in treated wastewater might foster or
enhance the opportunity for human exposure to giardia and treated
waste water.
(4) The water backed up behind the dam by the beavers seasonally does
not flow over or through the dam; i . e . the water in the beaver pond is
substantially treated waste water.
(5) Increasing the size -of the plant, the additional discharge may
cause additional flooding behind homes and to the waste water
treatment plant.
To resolve this matter, this Division would recommend that the two
plants known as Kynwood and Abington be combined with one discharge pipe
located in a flowing stream. This Division is concerned about the
increased public health risk currently existing at the beaver pond as a
result of treated wastewater seasonally being the majority of the source of
water for the beaver pond. A single discharge pipe for the two facilities
below the beaver dam is our recommendation.' This Division believes that
P.O. Box 686 • Winston-Salem, North Carolina 27102-0686

1
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Mike Mickey
May 9, 1994
Page 2
this measure would substantially reduce the risk to public health. If this
recommendation is not practical due to costs, etc. then this Division would
hope your office would deny approval of my increases in flow at the
Abbington Waste Water Treatment Plant_
If you have any questions please contact me at [phone],
extension 3812.
Sincerely,
DIVISION OF ENVIRONMENTAL HEALTH
f t1g s.
Jim Bryan, R.S.
Environmental Health Supervisor
JB : j s
cc: Michael James
Environmental Health Specialist
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