NC0036277_Authorization to Construct_19951120

WDES DOCUMENT' SCANNINL COVER 59.3EET
NPDES Permit:
NC0036277
McDowell Creek WWTP
Document Type:
Permit Issuance
Wasteload Allocation
Authorization to Construct
AtC)
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Permit Modification
Complete File - Historical
Engineering Alternatives (EAA)
Correspondence
Instream Assessment (67b)
Speculative Limits
Environmental Assessment (EA)
Document Date:
November 20, 1995
This document it printed on reuBe paper - ignore any
C011tent On tlhe weYe2`Se bide

-State of North Carolina
Department of Environment, IT
Health and Natural Resources 4 •
Division of Environmental Management
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James B. Hunt, Jr., Governor .ramIL
Jonathan B. Howes, Secretary p E H N F=?L
A. Preston Howard, Jr., P.E., Director
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November 20, 1995
Mr. Douglas O. Bean
Charlotte Mecklenburg Utility Department
5100 Brookshire Boulevard
Charlotte, North Carolina 28216
Subject: Permit No. AC0036277
Authorization to Operate
CMUD - McDowell Creek W WTP
Mecklenburg County
Dear Mr. Bean:
A letter of request for an Authorization to Operate was received August 23. 1995 by the Division
and plans, specifications and final calculations for the subject project have been reviewed and found to be
satisfactory. Authorization is hereby granted for the operation of the existing wastewater treatment plant at
the permitted flow of 3.5 MGD with discharge of treated wastewater into McDowell Creek in the Catawba
River Basin.
This Authorization to Operate is issued in accordance with Part III, Paragraph C of NPDES Permit
No. NCO036277 issued October 2, 1995, and shall be subject to revocation unless the wastewater
treatment facilities are operated in accordance with the conditions and limitations specified in Permit No.
NC0036277.
The sludge generated from this treatment facility must be disposed of in accordance with G.S. 143-
215.1 and in a manner approved by the North Carolina Division of Environmental Management.
In the event that the facilities fail to perform satisfactorily, including the creation of nuisance
conditions, the Permittee shall take immediate corrective action, including those as may be required by this
Division, such as the construction of additional or replacement wastewater treatment or disposal facilities.
The Permittee shall employ a certified wastewater treatment plant operator to be in responsible
charge (ORC) of the wastewater treatment facilities. The operator must hold a certificate of the type and
grade at least equivalent to or greater than the classification assigned to the wastewater treatment facilities
by the Certification Commission. The Permittee must also employ a certified back-up operator of the
appropriate type and grade to comply with the conditions of Title 15A, Chapter 8A, .0202. The ORC of
the facility must visit each Class I facility at least weekly and each Class II, III, and IV facility at least
daily, excluding weekends and holidays, and must properly manage and document daily operation and
maintenance of the facility and must comply with all other conditions of Title 15A, Chapter 8A, .0202.
A copy of the approved plans and specifications shall be maintained on file by the Permittee for the
life of the facility.
P.O. Box 29535, Raleigh, North Carolina 27626-0535 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post -consumer paper

Permit No. NC0036277
Authorization to Operate
CMUD - McDowell Creek
November 20, 1995
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The Operational Agreement between the Permittee and the Environmental Management
Commission is incorporated herein by reference and is a condition of this Permit Noncompliance with the
terms of the Operational Agreement shall subject the Permittee to all sanctions provided by G. S. 143-
215.6 for violation of or failure to act in accordance with the terms and conditions of this Permit.
Failure to abide by the requirements contained in this Authorization to Operate may subject the
Permittee to an enforcement action by the Division of Environmental Management in accordance with
North Carolina General Statute 143-215.6A to 143-215.6C.
The issuance of this Authorization to Operate does not preclude the Permittee from complying with
any and all statutes, rules, regulations, or ordinances which may be imposed by other government
agencies (local, state, and federal) which have jurisdiction.
One (1) set of approved plans and specifications is being forwarded to you. If you have any
questions or need additional information, please contactr:Greg Nizich, telephone number 919/733-5083,
ext. 541.
Sincerely,,/ n A /
�A- Preston Howard, Jr., P.E.
cc: Central Files
Mecklenburg County Health Department
Mooresville Regional Office, Water Quality
Technical Assistance and Certification Group
Facility Assessment Unit
Mr. David Parker, Black & Veatch
NPDES Files
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SOC Priority Project: No
T
To: Permits and Engineering Unit
Water Quality Section
+ Attention: Greg Nizich
Date: September 18, 1995
NPDES STAFF REPORT AND RECOMMENDATION
County: Mecklenburg
Permit No. NCO036277
ACF036277
PART I - GENERAL INFORMATION
1. Facility and Address: Charlotte - Mecklenburg Utility Dept.
McDowell Creek WWTP
5100 Brookshire Boulevard
Charlotte, North Carolina 28216
2. Date of Investigation: September 14, 1995
3. Report Prepared by: Todd St. John
4. Persons Contacted and Telephone Number: Peter Goins, Plant Operator [phone]
5. Directions to Site: From the intersection of SR 2128 (Beatties Ford Road) and SR 2074
(Neck Road), travel west on SR 2074 approximately 1.9 miles. The WWTP is located on
the right side of SR 2074 after crossing McDowell Creek.
6. • Discharge Point(s), List for all discharge points:
Latitude: 35° 22' 52" Longitude: 80° 5612511
Attach a USGS map extract and indicate treatment facility site and discharge point on map.
USGS Quad No.: F15NW USGS Quad Name: Lake Norman South, NC
7. Site size and expansion area consistent with application? Adequate area exists for the
proposed expansion.
8. Topography (relationship to flood plain included): Moderately sloping, neither the WWTP
nor the expansion area are located within the 100 year flood plain.
9. Location of nearest dwelling: None within 1000 feet.

10. Receiving stream or affected surface waters: McDowell Creek
a. Classification: WS-IV CA
b. River Basin and Subbasin No.: Catawba 030833
C. Describe receiving stream features and pertinent downstream uses: Small slow
moving stream, there are several small wetland areas adjacent to the creek. The
CMUD water intake is located a few miles downstream on Mountain Island Lake.
The lake is also used for primary and secondary recreation.
PART II - DESCRIPTION OF DISCHARGE AND TREATMENT WORKS
a. Volume of wastewater to be permitted: 3.5 MGD (ultimate design capacity) .
b. Current permitted capacity of the wastewater treatment facility: 3.0 MGD
C. Actual treatment capacity of the current facility (current design capacity): 3.5 MGD
d. Date(s) and construction activities allowed by previous Authorizations to Construct
issued in the previous two years: N/A
e. Please provide a description of existing or substantially constructed wastewater
treatment facilities: The existing W WT facilities consist of 2 manual bar screens, grit
removal, influent pumping, 2 primary clarifiers, 2 trickling filters, first stage aeration,
2 intermediate clarifiers, second stage aeration, 2 final clarifiers, aerated polishing
pond, 4 anaerobic sludge digesters, and chlorination.
f. Please provide a description of proposed wastewater treatment facilities: The
WWTP improvements proposed for Phase I involve the replacement of the sock
diffusers with flexible membrane diffusers in the final 2/3 portion of the aeration
basins. The modifications are already in place and operational.
g. Possible toxic impacts to surface waters: This facility has a history of compliance
with toxicity testing.
h. Pretreatment Program (POTWs only): The CMUD has an approved pretreatment
program. There are 3 significant industrial users permitted to discharge process
wastewater to the WWTP.
2. Residuals handling and utilization/disposal scheme: Residuals treatment consists of four
anaerobic digesters, sludge drying beds, and land application.
a. If residuals are being land applied, please specify DEM permit no.: WQ0000057
Residuals Contractor: Bio Gro, Inc. Telephone No.: [phone]
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r
b. Residuals stabilization: PSRP
3. Treatment plant classification: Class IV (rating will not change as a result of the proposed
expansion).
4. SIC Code(s): 4952
Wastewater Code(s): 01
Main Treatment Unit Code: 11503
PART III - OTHER PERTINENT INFORMATION
1. Is this facility being constructed with Construction Grant funds or are any public monies
involved (municipals only)? The proposed WWTP modifications will be funded with public
monies.
2. Special monitoring or limitations (including toxicity) requests: Effluent limitation changes
should be implemented with the increase in design capacity. No additional monitoring and/or
limitations are recommended at this time.
3. Important SOC, JOC or Compliance Schedule dates (Please indicate): N/A
4. Alternative Analysis Evaluation: N/A
PART IV - EVALUATION AND RECOMMENDATIONS
The permittee, Charlotte - Mecklenburg Utility Department, has applied for authorization to
construct additional aeration capability (Phase I) at the subject facility. This additional aeration is
already in place and operational. The addition has increased the current capacity of 3.0 MGD to 3.5
MGD. The WWTP expansion is the result of the tremendous growth in the northern part of
Mecklenburg County.
Mr. Barry Gullet, Assistant Director with CMUD, has requested that a proposed residual
chlorine limit, which is anticipated upon expansion, not take effect until annual effluent flows
average 3.0 MGD. However, this Office recommends that the proposed chlorine limit should take
effect immediately as plant capacity has already increased.
Signature o report preparer Date
G�
Water Quality gional Supervisor 6ate
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