NC0025534_Speculative Limits_19940112

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NPDES DOCUHENT !;CANNING COVER SHEET
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NPDES Permit:
NC0025534
Hendersonville WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct (AtC)
Permit Modification
Complete File - Historical
Correspondence
Speculative Limits -
Instream Assessment (67b)
Environmental Assessment (EA)
Permit
History
Document Date:
January 12, 1994
- This document is printed on reuse paper - ignore arty
content on the rezrerse side

State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Environmental Management
James B. Hunt, Jr., Governor
Jonathan B. Howes, Secretary
A. Preston Howard, Jr„ P.E., Director
Tom Kilpatrick
Director of Water & Sewer Utilities
P.O. Box 1760
Hendersonville, NC 28793
Subject:
January 12, 1994
Speculative NPDES Limits
City of Hendersonville
NPDES No. NC0025534
Henderson County
Dear Mr. Kilpatrick:
-Avv7vA
CoEHNR
My staff has completed an evaluation for speculative effluent limits for the City of
Hendersonville. On the basis of projected growth, the City has requested discharge limits at 7 MGD for a
new discharge site to the French Broad River. Since the proposed expansion is greater than 0.5 MGD and
involves a relocation, an Environmental Assessment including justification of the need for the additional
wasteflow will be necessary. You should contact Boyd DeVane or Monica Swihart of the Water Quality
Planning Branch at [phone] for more information.
follows:
On the basis of the information available, tentative limits for conventional constituents are as
summer winter
BOD5 30 mg/1 30 mg/1
NH-3-N 23 mg/1 (ammonia toxicity) monitor
TSS 30 mg/1 30 mg/1
Fecal Coliform 200/100 ml 200/100 ml
pH 6-9 su 6-9 su
Chlorine 28 ug/1 28 ug/1
These limits are based on empirical desktop modeling only. There are observed dissolved oxygen
levels below 6 mg/1 in this reach of the French Broad River. Due to the number and size of discharges, a
field -calibrated model of the French Broad River from Brevard to Asheville may be developed. Limits for
oxygen -consuming wastes, i.e., BOD5 and NH3-N may be revised based on model results.
Under a relatively new Division procedure, dechlorination and chlorine limits are now
recommended for all new or expanding discharges proposing the use of chlorine for disinfection. An
acceptable level of chlorine in Hendersonville's effluent is 28 ug/l.for protection against acute toxicity.
Other chemical specific limits will be determined based on a review of pretreatment information. A
quarterly chronic toxicity test at 3% will be required.
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 1 D% post -consumer paper
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The Division has some concerns with the application of constructed wetlands treatment in the
moutains. The cold temperatures may make BOD and NH3-N removal difficult to acheive during the
winter months. Therefore a subsurface treatment system is recommended. Tony Evans of the Water
Quality Planning Branch should be contacted at [phone] for more information on constructed
wetlands for wastewater treatment.
The Division is initiating a basinwide water quality management strategy for the state's surface
waters. All NPDES permits within a given basin will be renewed in the same year, allowing the Division
to examine interaction among all point and non -point sources of pollutants for that basin. The basin plan
for the French Broad Basin will be finalized in 1995 and a draft version will be available for public
comment sometime in 1994. In addressing interaction of sources, wasteload allocations may be affected.
Those facilities that already have high levels of treatment technology are least likely to be affected. The
City of Hendersonville may want to consider implementation of this basinwide strategy in planning its
expansion.
Henderson County has also expressed interest in constructing a wastewater treatment plant on the
French Broad River below Mud Creek. The Division strongly encourages regional planning between the
City and County.
The above limits are speculative and are for use in an engineering review of discharge
alternatives. Final limits will be provided upon receipt of an application for permit expansion. If you
have any questions concerning the above issues, please contact Btottirfflinstin of my staff at (919) 733-
5083.
y>�
Donald L. Safrit,
Asst. Chief for Technical Support
Water Quality Section
DLS/caj
cc: Boyd DeVane
John Domey
Asheville Regional Office
McGill Associates, P.A.
Central Files

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A1,CONSULTING ENGINEERS
McGILL ASSOCIATES, P.A.
November 3, 1993
Mr. Trevor Clements
North Carolina Department of Environment, Health
and Natural Resources
Division of Environmental Management
Post Office Box 29535
Raleigh, North Carolina 27626-0535
Dear Mr. Clements:
wiv 11193
RE: French Broad River
Wastewater Treatment Facility
City of Hendersonville
The City of Hendersonville is in the preliminary design stage for the construction of a new wastewater
treatment facility to replace the existing facility located on Mud Creek in Henderson County. The proposed
new facility will have a design flow of 7.0 MGD and will be located at the confluence of Mud Creek and the
French Broad River with discharge into the French Broad River. The proposed plant location is shown on
the enclosed location map. Treatment facilities at the proposed plant will consist of primary screening and
grit removal followed by secondary treatment utilizing the activated sludge process within Oxidation Ditches.
Following secondary treatment 3.8 MGD of the effluent will receive additional treatment utilizing constructed
wetlands. This flow represents the additional flow over and above the current discharge into Mud Creek.
In order to complete an Environmental Assessment for the new project and to assist in the preliminary
design phase we are hereby requesting that you provide us with speculative NPDES permit limits for the
phase one design flow of 7.0 MGD( 20 year flow) and the future design flow of 14 MGD. The discharge
point is as shown on the enclosed location map.
We appreciate your assistance with this project and are in need of a timely response to this request
since the City of Hendersonville is currently operating above the SO% capacity threshold at the existing plant.
Beginning construction of the new plant within the next 12 months is desirable due to the current flow at
the existing facility. If you have any questions or need further information, please contact me at (704) 252-
0575.
Enclosure
cc:Tom Kilpatrick
Wayne Cooper
Paul White
93247.01/clemt3
Sincerely,
McGILL ASSOCIATES, P.A.
M. KEITH WEBB, P.E.
Project Manager
P.O. BOX 2259 / 704/252-0575 / 39 ORANGE STREET
ASHEVILLE,NC 28802 704/252-2518 (FAX) ASHEVILLE,NC 2BB01