NC0078955_Staff Report_19910115

Refer: Basinwide / Streamline WLA File
Completed By Permits & Engineering
At Front Of Subbasin
January 15, 1991
NPDES STAFF REPORT AND RECOMMENDATIONS
County Harnett
NPDES Permit No.WAC0078955
PART I. GENERAL
1. Facility and Address: City of Dunn Water Plant
P.O. Box 1065
Dunn, NC 28334
2. Date of Investigation: December 11, 1990
3. Report Prepared By: Kitty A. K. Kramer, Env. Tech., FRO
4. Persons Contacted and Telephone Number: Victor Quick, Chief Operator
James Barefoot, Assist.
Tony Morrison, Assist.
[phone]
5. Directions to Site: From the intersection of Hwy. 217 and "E" Street,
take "E" Street west to the water plant.
6. Discharge Point(s), List for all discharge points:
Latitude: 35� 19' 30"
Longitude: 78- 41, 50"
Attach a USGS map extract and indicate treatment facility site and
discharge point on map.
USGS Quad No. F 24 SW USGS Quad Name Erwin, NC
7. Size (land available for expansion and upgrading): 5 acres.
e.
Topography
(relationship to flood plain
included): Gently sloping.
9.
Location of
nearest dwelling: Less than
1,000 feet.
10.
Receiving stream or affected surface waters:
Juniper Creek
a. Classification: "C"
b. River Basin and Subbasin No.: 030613
C. Describe receiving stream features and pertinent downstream uses:
Fish and wildlife propagation.
PLOTTED

Staff Report and Recommendation
Page 2
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
1. Type of wastewater: % Domestic
100 % Industrial
a. Volume of Wastewater: 0.2 MGD (Design Capacity)
b. Types and quantities of industrial wastewater: Treated filter
backwash and settling basin drainage wastewater.
C. Prevalent toxic constituents in wastewater: N/A
d. Pretreatment Program (POTWs only):
in development N/A approved N/A
should be required N/A not needed N/A
2. Production rates (industrial discharges only) in pounds per day:
a. Highest month in the past 12 months: N/A lbs/day
b. Highest year in the past 5 years: N/A lbs/day
3. Description of industrial process (for industries only) and applicable
CFR Part and Subpart: N/A
4. Type of treatment (Existing): The existing wastewater treatment system
consists of a 1.5 MGD lined storage lagoon with 9,030 sludge drying
beds. Presently, this system is being operated as a closed recycle
system with supernate from the drying beds returning to the storage
lagoon and all water from the storage lagoon being pumped back to the
flash mixers. The City has requested a discharge permit so that they
will have the option to discharge the clear water from the storage
lagoon as well as recirculate it back to the flash mixers. The City has
polymer control that is added to the sludge prior to the placement of
the sludge on the drying beds.
S. Sludge handling and disposal scheme: Sludge is settled in the storage
lagoon and pumped to the sludge drying beds with final disposal in the
County landfill.
6. Treatment plant classification: Grade II (see attached rating sheet)
7. SIC Code(s):
Wastewater Code(s):Primary 4941 Secondary 21

Staff Report and Recommendation
Page 3
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grants Funds
(municipals only)? N/A
2. Special monitoring requests: No.
3. Additional effluent limits requests: No.
4. Other:
PART IV - EVALUATION AND RECOMMENDATION
k.
Signature off Report Preparer
Water Quality Regional Supervisor
Date

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(MISCELLAK80US,UNITS CONTINUED) POINTS
(c) Folding Pond for Effluent Flow Equalization and/or
Stage Discharge ... ...... . . . . . . . . . 5
1dEffluent Pumps ... .... . . . . . .. .
e In -Plant P4■ps (including air lifts). . . .. . . .
f Stand -By Power Supply . . . . . . . . ... . . . . 4)
9 Thermal Pollution Control Device . .. . . . . . . 3
hi Treatment Processes for Removal of Meta] or Cyanide and
other Toxic Materials ... :.. . . . . .. . . 30
Total Points
1% CLASSIFICATION
Class I . .. . . . . . . . . . . . . . 5 - 25 Points
Class II . . . . .... . . . . . . . . 25 - 50 Points
Class III .. . . . . . . . . . . . . . 51 - 65 Points
Class IV . . ...... . . . . . .. 66 - Up Points
Facilities having a rating of one through four points, inclusive,
do not require a certified operator. Classification of all other
facilities requires a comparable grade operator in responsible charge.
North Carolina
Division of Environmental Management
Checklist of Facility Components
To be Used In Determing Facility Classification
All information will be printed:
Name of Plant
County 14 elf-&, L�}
Owner or Contact Person Cc6rl
99
e e ne
Mailing Address ,
Street or P.O. Box Town or City Zip
Perwit Number Information
Construction Status
NPOES Perin No. ,NG001_21,4L5
Please Check:
Existing Faci 1 i ty
Date Issued
Upgraded Facility
New Faci 1 i ty
State Per�ai t No. "'
If Upgraded or New-aci 1 i ty. Gi ve
50% Completion Date
Date Issued - --
1001•Completion Date
Rated by JG1m rv. r
Regional Office %iIto Date 12
Operator in Responsible Charge
ki name �� Grade
Design Flow of Plant in GPD
2,O13, DAO „Plant Class
ITEM
POINTS
ill PRETREATMENT UNITS (see definition No. 34)
2
2 DESIGN FLOW OF PLANT IN GPD (not applicable to non -
contaminated cooling waters and non -discharging systems
0 -- 209000 . . . . . . . . .,,. . . . .
1
20.001 -- 50,000 . . . . . . . . . . . . . . .. .
. 2
50.001 -- 100.000 . . . . . . . . . . . . . . . . .
.
1009001 -- 2SO9000 . . . . . . . . . . . . . . . . .
. 4
2500001 -- 500,000 . . . . . . . . . . . . . . . .
.
500.001 -- 100009000 . . . . . . . . . . . . . . . . .
. 8
1,000,001 -- 2;000'000 . . . . . . . . . . . . . . . .
. 10
2,000.001 (and up) - rate 1 point additional -for each 200,000
GPO capacity up to a m xlm of .
30
Design Flow (GPD):
(3) PRELIMINARY UNITS (see definition ..
jai Influent Pumps (including air lift)
3
bBar Screens . . . . . . . . . . . . . . . . .
I
or
(c) Mechanical Screens, Static Screens or Commainuting
Devices . . . . . . . . . .. . . . . .. . . . . .
2
Grit Removal or . . . . . . . . . . . . . . . .
1
e Mechanical or Aerated Grit Removal . . . . . . . . .
idl
2
f) Flow Measuring Device or . . . . . . . . . . . . . .
1
(9) Instrumented Flow Measurement . . . . . . . . . . . .
2
-4- Effective
4/ 1/87 _ 1_

(4)
(5)
(6 )
ITEM
POINTS
h
Preaeration or Equalization . . . . . . . .
i
i;
. . . .
Grease or Oil Separators -- Gravity . . . . . . .
2
Mechanical. . . . . . .
3
Aerated
U) Chemical Conditioning . . . . . . . .
5
5
. . . . . . .
PRIMARY TREATMENT UNITS
Septic Tank (see definition No. 44) . . . .
2
b
Ia
. ... .
Imhoff Tank .
c
..
Primary Clarifiers (including sludgeairlifts)
3
5
di
Settling Ponds or Settling Tanks for Inorganic Non -
Toxic Materials Inwlving a Discharge to the Surface
waters (sand, gravel. stone, and other mining operations
except recreational activities such as gem or gold
mining) . . . . . . . . .
10
. . . . . . . . ..
SECONDARY TREATMENT UNITS
(a) Carbonaceous Stage
(1) Aeration - High Purity Oxygen System . . . .
20
Diffused Air System .
10
Mechanical Air System (fixed, floating or rotor) 8
Separate Sludge Reneration . . . . .
3
. . . .
(if) Trickling Filter - High Rate . . . . . . . ,
7
Standard Rate . . . . . .
5
(III
Packed Tower . . . . . . .
Aerated Lagoons .. .
5
10
(iv)
(vj
. .
Rotating Biological Contactors (biodisc). . .
Sand Filters (intermittent biological)
10
(vi)
. . .
Stabilization Lagoons
2
5
(vii)
Clarifier (including sludge air lifts). . .
5
.
(b) Nitrogenous Stage
(i) Aeration - High Purity Oxygen System. . . . .
20
Diffused Air Systems. 10
Mechanical Air System (fixed, floating, or rotor)8
Separate Sludge Reaeration . . . . . . .
3
. .
III) Trickling Filter - High Rate . . . . , . . ,
7
Standard Rate . . . . . .
S
.(111)
(iv
Packed Tower. . . . . .
Rotating Bioiogical Contactors (biadisc) . .
Sand Filter (intermittent biological).
5
10
(v)
. . .
Clarifier (including sludge air lifts) . . .
2
5
TERTIARY OR ADVANCED TREATMENT UNITS
(a) Activated Carbon Beds - Without Carbon regeneration
5
With Carbon regeneration.
(b) Powdered or Granular Activated Carbon Feed - Without
15
Carbon regeneration . . .
5
(c)
With Carbon regeneration.
Ammonia Stripping
15
d)
. . . . . . . . . . . . . . . .
Chemical Additions . . . . . .
18
5
e)
. . .
Denitrification Process (separate process).
10
f
g
(h
Electrodialysis . . . . . . . . . . .
Foam Separation . . . . . . . . . . . .
Ion Exchange
5
5
. . . .. . . . . . . . . . . . . . .
5
-2-
ti
ITEM
POINTS
(i)
land Application (see definition.No. 23b)
5
(not applicable for facilities under 10(a)
(j
Mi croscreens . . . . . . . .. . . ... . . . .
5
k
#1
Phosphorus Removal .. ..
Polishing Ponds- Without aeration .. .'.
Z0 .
2
(�)
With aeration . . ..... . . .
Post Aeration - Cascade
5
. . ... . . . . . . . . .
Diffused or Mechanical . . . . . .
0
5
-Pre-Package Unit for Removal of Oil and Grease
30
o
JnJ
p
Reverse Osmosis . . . .. . . : •. , , , . ..
Sand or Mixad-Media Filters -- Low Rats .. . . . .
5
2
High
(7) SLUDGE TREATMENT Rats • .
5
(a)
Sludge Digestion Tank -• Heated .. .. ..
10
. . . .
Aerobic . ' . . .. . . . .
5
b
c
Unheated . .. . . . . ...
Sludge Stabilization (chmical -ar the ul)
Sludge Drying Beds .. .......
3
d
Sludge Elutriation . . . .
e
f
. . ... . .
Sludge Conditioner (chemical or thermal) .. . . .
Sludge' Jhickener .............. ;
q
9
h
. .
Sludge Gas Utilization (including gas storage)....
Sludge Holding �ted
2
.
Tank » .. . . .. . . . .
5
(i)
Non -aerated .. . ... . .
Sludge Incinerator (not including activated carbon
regeneration)
2
(j)
........
Vacuum Filter, Centrifuge or Filter Press
10
10
(8) S ... .
SAL(including.incinerated ash).b�a
j
goons . •
Land Application (surface and subsurface)•(see def.
2
(c)
Landf111ed burial) . . . . . . . . . .
( ) . . . . . . . . . . .
(9) DISINFECTION
" '
a
Pre ......................
1
b
c
Intermediate . . . . . . . . . ..
Post
2
dDechlorination
{ . . . . . .0
. . . . . . . . . . . . .. . . .
3
5
e
fRadiation
Chlorine or Ozone Generation . . . . . . . . ;..
5
(10) MISCELLANEOUS
. . . . . . . . . . . . . . . . . . . .
UNITS
3
(a)
Holding Ponds or Holding Tanks for Inorganic, Non -toxic
Materials with no Discharge to the Surface Waters
2
(Sludge handling facilities -for water purification
plants, sand, gravel, crushed stone and other similar
operations --see definition No. 10)
(b)
Holding Ponds or Holding Tanks for Organic or Toxic
Materials with no Discharge to the surface Waters
4
(Any pump, valve, or other mechanical control subject
to failure creating a potential for bypass or discharge
from the holding ponds or tanks will necessitate a
minimum classification of Class I requiring a certified
operator).
-3-

DIVISION OF ENVIRONMENTAL MANAGEMENT
id
January 15, 1991
M E M O R A N D U M
TO: Donald Safrit, Unit Supervisor
Permitting and Engineering Unit I '„
FROM: M. J. Noland, Regional Super sor'�"!��
Fayetteville Regional Office
SUBJECT: Proposed Discharge NPDES PermitTNCO078955
City of Dunn Water Treatment Plant
Harnett County, North Carolina
)r,ni 1 8 1991
010
Please find enclosed the staff report and recommendations of the
Fayetteville Regional Office concerning the issuance of an NPDES Permit for
subject facility.
If you have any questions or require any further information, please
advise.
MJN/AKK/tf
Enclosure
cc: Technical Support Branch