NC0025402_Wasteload Allocation_19851217

NPDES DOCUHENT SCANNING COVER SHEET
NPDES Permit:
NC0025402
Enfield WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Owner Name Change
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
December 17, 1985
This document is printed on reuse paper. - ignore any
content on the reYerise side

Date Rec.
Facility Name: ,
Existing O
Proposed Cr 6,-E-c.,d Permit No.: r(('n()D51-1,-, Pipe No.:
Design Capacity (MGD) : 0 , 5- Industrial (% of Flow) : Domestic (% of Flow) :
NPDES WASTE LOAD ALLOCATION
Engineer
2 7j )
Date
Receiving Stream: s l
Reference USGS Quad:
Class:
(Please attach)
County:
Sub -Basin: 0 "630(-(
loo
Requestor :W , c Regional Office
(Guideline limitations, if applicable, are to be listed on the back of this form.)
Design Temp.: Drainage Area (mi2):
7Q10 (cfs) /+, 2 Winter 7Q10 (cfs)
Location of D.O. minimum (miles below outfall):
Velocity (fps) :
3 S
K1 (base e, per day):
Avg. Streamflow (cfs) :
30Q2 (cfs)
Slope (fpm)
K2 (base e. oer day):
Effluent
Characteristics
Monthly
Average
Comments
ohs (v-
/12)
3J
P(+ ( 5 0
)
6-5
� �5 C ,,,,,,
� �
� o
.
Original
Re--
on
epared By:
ati.n O Comments:
ation
0
a a 0- EL 01
Effluent
Characteristics
iznthly
Lverage
Reviewed By:
Comments
4-8V
eCtleCt,
Date: / 21/ 71 Yr

-
,
Reouest No. | 2740
WASTELOAD ALLOCATION APPROVAL FORM
Facility Name ENFIELD
Type Of Waste | DOMESTIC
Receiving Stream BURNT COAT SWAMP
Stream Class C-SW
Subbasin 030304
County HALIFAX
Regional Office RALEIGH
Reouestor BLACK & VEATCH
Drainage Area (so mi) 35
7010 (cfs) 0^2
Winter 7Q10 (cfs)
30Q2 (cfs) �
U5/
`
------------------------- RECOMMENDED EFFLUENT LIMITS --------------------------
Wasteflow (mgd) 0,5
5-Day BOD (MA/1) 30
PH (SU) 6-9
Fecal Coliform (/100ml): 1000
TES (mg/l) 30
COMMENTS
LIMITS FOR A DIFFUSIVE OUTFALL (WETLANDS DISCHARGE).
RESUBMITTAL^
SEE ATTACHED REPORT.
FACILITY IS ! PROPOSED ( ) EXISTING (�//) NEW ( )
LIMITS ARE 1 REVISION (^/) CONFIRMATION ( ) OF THOSE PREVIOUSLY ISSUED
RECOMMENDED BY:
REVIEWED BY:
SUPERVISOR, TECH, SUPPORT
REGIONAL SUPERVISOR
2-0t �-I- J.- T F
Approval is ( ) preliminary ( ) fir^,J
PERMITS MANAGER
--DATE
_---DATE
^
`-^~~'yl---

State of North Carolina
Department of Natural Resources and Community Development
512 North Salisbury Street • Raleigh, North Carolina 27611
James G. Martin, Governor S. Thomas Rhodes, Secretary
April 26, 1985
The Honorable John Leo Bellamy
Mayor, Town of Enfield
Post Office Box 695
Enfield, NC 27823
Dear Mayor Bellamy:
The Division of Environmental Management has recently completed an
evaluation of the Enfield discharge. I have attached for your information
a copy of the water quality survey report on this study. The Division s
Water Quality Section has determined that an opportunity exists to utilize
a wetland discharging system for your wastewater. We are convinced that
the Beach Swamp provides adequate assimilative capacity to accept secondary
wastewater from the Tbwn of Enfield.
Because of this determination the Wastewater Facilities (201) Plan
for the Town of Enfield should consider this as an alternative for
handling your wastewater treatment needs. I have attached a summary of
effluent limitations which would apply to a wetland discharge system.
These limitations are contingent upon securing adequate areas (2 - 3
acres) to mix the wastewater with the receiving waters (via a diffuser
system), and for allowing the wetland to assimilate the wastewater. The
Water Quality Staff will be available to assist you and your consulting
engineers in developing any information necessary to support this as an
alternative in the 201 plan. If you have any questions concerning the
201 process, please contact Mr. Coy Batten at 919/733-6900. If you have
any questions concerning the water quality evaluation, please contact
Steve Tedder at 919/733-5083.
R. Paul Wilms
Attachment
cc: Mr. Lee Fleming
Mr. Steve Tedder
Mr. -Jim Mulligan
Mr. Coy Batten
Ms. Meg Kerr
P.O Box 27687, Raleigh, North Carolina 27611-7687 Telephone [phone]
An Equal•Opportunity / Affirmative Action Employer

Present Facility
The present facility is a 0.5 mgd trickling filter system which discharges to
Jacket swamp(Burnt Coat Swamp). Jacket Swamp at this location has a 35 square
mile drainage area and an estimated 7010 of 0.2 cfs. Slope of this system is
approximately 2.85. This facility has had a history of operational problems
resulting in non-compliance with discharge limits. As a result Enfield is
currently operating under a Special Order of Consent. Self monitoring data,
which has not undergone quality assurance checks, indicate yearly average BOD
levels of 20mg/1 for the 1984 calendar year (data attached). During our March
site visit this facility appeared to be at a good operational level. Later,in
conversations with Dave Adkins of the Raleigh Regional Office, it was learned
that a new firm had taken over the operations of this facility -obviously
improving the previous situation.
Description of Receiving Stream
The present discharge is located approximately 2 blocks west of U.S. Highway
301. The discharge is to a small finger of the Beech Swamp system. This area
is a broad,flat,and shallow gum-cyprus swamp with a very large drainage area.
Soil types in this area have been classified Bibb-Roanoke-Wehadkee
Association. These soils are nearly level/very poorly drained and subject to
over flow. The overstory vegetation is well developed yet the density of the
understory canopy is very limited as are grasses.
Historical Data
Historical data is available from self monitoring data taken upstream and
downstream of the facility. The upstream monitoring location is a S.R.
1001-considerable distance upstream. Downstream monitoring is performed at
Highway 301-which may not even be downstream of the waste. Review of this
data caused questions to be raised concerning the quality of its collection.
Therefore it was not heavily relied on in this evaluation. It did however
indicate that dissolved oxygen measurements did naturally(without effluent) go
below 5.0 mg/1. Two ambient stream monitoring stations existed in this area
as part of the secondary monitoring network. These stations were above and
below (if highway 301 is indeed below) the discharge. TAR034-Jacket Swamp NR
Enfield was located at Franklin Street presumabl above -the WWTP outfall.
TAR035-Jacket Swamp AT Enfield was located at Hi way 301. Data from this

monitoring effort also indicated D.O. levels below the 5.0 mg/1 concentration.
Data on pH and coliform measurements is also attached but of little interest.
Evaluation
Site screening information furnished by Construction Grants presented no
constraints to a wetlands wastewater management system. Based on a loading
rate of one inch per week 128 acres of wetland are required to accommodate 0.5
mgd of wastewater. It is clear from the questionnaire that back calculations
were performed to arrive at this number of acres. While this is acceptable,
prudence should indicate that it is the intent of this formula to minimize
hydraulic loading. Therefore if more of the wetland is available to the Town,
the loading rate should be decreased, particularly since soil types indicate
very poor drainage. Furthermore, it is recommended to increase the drainage
area of the distribution system to account for this decreased percolation and
the lack of a dense understory. A suggested area might be three acres. It is
obvious that the Beech Swamp System is extremely large, and control of the
land practices within this entire system is going to be impossible. However,
it should be made explicitly clear to Construction Grants and the Town that
control of the designated wetland acreage (128 acres min.) be acquired to
prevent destruction of vegetation, timber, and hydraulic characteristics which
make this system suitable for assimilation of secondary treated wastewater. ,
cc Randy Dodd

EFFLUENT LIMITATIO:'IS *
DISCHARGER - RECEIVING STREAM
Y
r..4
C/')
n
a1
ul
STREAM CLASS
0
-J
0
cfs
DESIGN FLOW *
BODultimate
*
LC)
`D CD
mg/1
*
Z.
1
N
O
mg/1
2 DISSOLVED OXYGEN*
o DESIGN STREAM
" Temp. used in
oxygen model
-h
STREAM SLOPE
TOTAL SUSPENDED
SOLIDS
FECAL CULIFORM *
'(Geometric mean)
C)
u TEMPERATURE
-n max./,arise
(stream values)
pH
ANALYSIS LEVEL
Enfield - Beach Swamp
TAR04
C-SW
0.2
0.5
110
i
30
t-
30
1000
6-9
Limits are for a wetlands
discharge system
,
:
.
.
.
1•
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