NC0061492_Engineering Design Basis_20180305

MCDAVID ASSOCIATES, INC.
1 Iili NC - Engineers•Planners •Land Surveyors
N C CORPORATE OFFICE GOLDSBORO OFFICE
[phone]•Fax[phone] [phone]•Fax[phone]
E-mail:[e-mail] E-mail•[e-mail]
3714 N.Mam Street•P.O.Drawer 49 109 E.Walnut Street•P.O.Box 1776
Farmville,NC 27828 Goldsboro,NC 27533
March 8, 2018 RECEIVED/DENR/DWR
Ms. Trupti Desai,P E MAR 1,3 2018
NC Department of Natural Resources
Division of Water Resources/NPDES Water Resources
512 N. Salisbury Street Permitting Section
Raleigh,NC 27604 Subject: Maury Sanitary Land District
Transmittal of ATC Application
MLSD WWTP
Alkalinity Feed
Permit No NC0061492
Greene County
Dear Ms. Desai:
Maury Sanitary Land District operates an existing 0.225 MGD WWTP in Green County off
Sylivant Farm Road or NCSR 1401. Originally, all drinking water in the service area was provided from
groundwater.Now the source of the water varies It can be groundwater or surface water. When the
source is groundwater, alkalinity is adequate in the influent wastewater to accomplish nitrification. When
the drinking water source changes to surface water,the alkalinity in the influent wastewater is not
adequate for nitrification.For the last few years the operator has been supplementing the alkalinity by
adding two 50 pound bags of powdered lime per day, seven days per week. The District wants a method
of adding alkalinity that is not as labor intensive.
The District would like to install a chemical feed pump to feed a 25% solution of NaOH,along
with a 3,000 gallon dual walled NaOH storage tank in order to provide alkalinity needed to accomplish
nitrification.The existing bagged lime method of providing alkalinity will be retained as a backup.
Attached are the following:
A. Application for Authorization to Construct(form ATC-12-14)
B. Draft NPDES Permit No.NC0061492 Dated July 1,2013. The NPDES Permit Application
has been submitted for renewal recently
C. Engineering Plans Contract No. 7
D. Necessary Specifications are included on the Plans Sheets.There are no separate
Specifications.
E. Design Basis
The District is requesting Authorization to Construct a chemical feed for the addition of alkalinity
to the WWTP,while retaining the existing method of providing alkalinity as a backup. Should you have
questions, give me a call.
Sincerely,
M AV ASSO IATES,INC.
ec` . aeden,J .
Goldsboro Office
cc: MSLD(with attachments)
W\D10XX GEN\D100X_MSW\D1005_CORRES_MSW\CGM\2016\MSLD-ALKALINITY FEED\TRANSMITTAL OF A TO C
APPLICATION DOCX
March 8,2018

State of North Carolina
Department of Environmental Quality
` Division of Water Resources
Warer Resources
ENVIRONMENTAL QUAL TY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC-12-14)
SECTION 1: INSTRUCTIONS AND INFORMATION
A. The Division of Water Resources will accept this application package for review only if all of the items are provided and the
application is complete Failure to submit all of the required items will result in the application package being returned as incomplete
per 15A NCAC 02T 0105(b)
B. Plans and specifications must be prepared in accordance with 15 NCAC 02H.0100, 15A NCAC 02T, North Carolina General Statute
133-3, North Carolina General Statute 143-2151, and Division of Water Resources Minimum Design Criteria for NPDES
Wastewater Treatment Facilities
C. The plans and specifications submitted must represent a completed final design that is ready to advertise for bid.
D. Any content changes made to this Form ATC-12-14 shall result in the application package being returned
E. The Applicant shall submit ONE ORIGINAL and ONE DIGITAL COPY (CD) of the application, all supporting documentation and
attachments All information must be submitted bound or in a 3-ring binder, with a Section tab for each Section, except the
Engineering Plans.
F. Check the boxes below to indicate that the information is provided and the requirements are met
G. If attachments are necessary for clarity or due to space limitations, such attachments are considered part of the application
package and must be numbered to correspond to the item referenced.
H. For any project that requires review under the State Environmental Policy Act (SEPA), an Authorization to Construct cannot be
issued prior to the completion of a State Clearinghouse advertisement period for a FONSI, EIS,etc unless the project qualifies for
a Determination of Minor Construction Activity
I. For more information,visit the Division of Water Resources web site at https//deq nc gov/about/divisions/water-resources/water-
resou rces-perm its/wastewater-branch/n pdes-wastewater/a uthorization-to-construct
J. In addition to this Authorization to Construct,the Applicant should be aware that other permits may be required from other Sections
of the Division of Water Resources(for example reclaimed water facilities permits;Class A or B biosolids residuals permit)
SECTION 2:APPLICANT INFORMATION AND PROJECT DESCRIPTION
A. APPLICANT
Applicant's name Maury Sanitary Land District
Signature authority's name per 15A NCAC 02T 0106(b). L A. Moye,Jr R C (V D/®ENRJDONR
Signature authority's title Chairman
MAR 132018
Complete mailing address P.O. Box 98, Maury, NC 28554
rces
Telephone number [phone] Permitting
ing Section
�ectlon
Email address cgm@mcdavid-inc corn
B. PROFESSIONAL ENGINEER
Professional Engineer's name Cecil G Madden,Jr., P.E
Professional Engineer's title Engineer
North Carolina Professional Engineer's License No 0016359
Firm name McDavid Associates, Inc.
Firm License number C-131
Complete mailing address P 0 Box 1776,Goldsboro, NC 27533
Application for Authorization to Construct Permit(FORM ATC-12-14) Page 1

� .5v .
egit State of North Carolina
Department of Environmental Quality
Division of Water Resources
Water Resources
ENVIRONMENTAL OUAL'TY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC-12-14)
Telephone number [phone]
Email address cgm@mcdavid-inc corn
C. NPDES PERMIT
NPDES Permit number NC0061492
Current Permitted flow(MGD)—include permit
flow phases if applicable 0 225 MGD
D. PROJECT DESCRIPTION
Provide a brief description of the project.The Operator currently adds alkalinity to the WWTP daily, by adding two 50 lbs bags of
lime to the oxidation ditch each day. In lieu of adding the lime manually,the operator will receive sodium hydroxide in a liquid
form,at a new 3,000 gallon dual walled chemical holding tank The 25%NaOH solution will be added to the WWTP via a
proposed chemical feed pump at the rate of 1.875 gallons per hour The discharge from the chemical feed pump will be directed
to the existing return sludge pump station where the return sludge with chemical feed will be directed back to the mixed liquor
suspended solids in the existing oxidation ditch There will be no other modifications to the treatment process
SECTION 3: APPLICATION ITEMS REQUIRED FOR SUBMITTAL FOR ALL PROJECTS
A. Cover Letter
® The letter must include a request for the Authorization to Construct,the facility NPDES Number, a brief project description
that indicates whether the project is a new facility,facility modification,treatment process modification,or facility expansion;
the construction timeline;and a list of all items and attachments included in the application package.
❑ If any of the requirements of 15 NCAC 02H 0100, 15A NCAC 02T, North Carolina General Statute 133-3, North Carolina
General Statute 143-215.1, and Division of Water Resources Minimum Design Criteria for NPDES Wastewater Treatment
Facilities are not met by the proposed design,the letter must include an itemized list of the requirements that are not met
B. NPDES Permit
® Submit Part I of the Final NPDES permit for this facility that includes Part A(Effluent Limitations and Monitoring Requirements)
for the monthly average flow limit that corresponds to the work that is requested for this project
C. Special Order by Consent
❑ If the facility is subject to any Special Orders by Consent(SOC),submit the applicable SOC.
® Not Applicable
D. Finding of No Significant Impact or Record of Decision
D Submit a copy of the Finding of No Significant Impact or Record of Decision for this project
❑ Provide a brief description of any of the mitigating factors or activities included in the approved Environmental Document
that impact any aspect of design of this project,if not specified in the Finding of No Significant Impact or Record of Decision.
® Not Applicable
Application for Authorization to Construct Permit(FORM ATC-12-14) Page 2

State of North Carolina
S
Department of Environmental Quality
Division of Water Resources
Water Resources
ENVIRONMENTAL QUALITY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC-12-14)
E. Engineering Plans
® Per 15A NCAC 02T 0504(c)(1),submit one set of detailed plans that have been signed,sealed and dated by a North Carolina
Licensed Professional Engineer
® Per 21 NCAC 56 1103(a)(6),the name,address and License number of the Licensee's firm shall be included on each sheet of
the engineering drawings.
® Plans must be labeled as follows:FINAL DRAWING—FOR REVIEW PURPOSES ONLY—NOT RELEASED FOR CONSTRUCTION.
® 15A NCAC 02H 0124 requires multiple (dual at a minimum) components such as pumps, chemical feed systems, aeration
equipment and disinfection equipment. Is this requirement met by the design? ❑ Yes or ® No. If no, provide an
explanation:Currently the WWTP provides alkalinity by adding two 50 LB bags to the oxidation ditch per day.The chemical
feed pump is an easier alternative to handling two 50 lbs bags per day If the pump goes out the operator can add the lime
by hand like he has been doing for several years.
Plans shall include:
® Plans for all applicable disciplines needed for bidding and construction of the proposed project(check as appropriate):
® CIviI ❑ Not Applicable
• Process Mechanical ❑ Not Applicable
® Structural ❑ Not Applicable
❑ Electrical Z Not Applicable
❑ Instrumentation/Controls ® Not Applicable
El Architectural ® Not Applicable
❑ Building Mechanical ® Not Applicable
O Building Plumbing ® Not Applicable
® Plan and profile views and associated details of all modified treatment units including piping,valves,and equipment(pumps,
blowers,mixers,diffusers,etc.) Plan view of proposed chemical feed piping has been provided.
❑ Are any modifications proposed that impact the hydraulic profile of the treatment facility?❑Yes or® No. If yes, provide
a hydraulic profile drawing on one sheet that includes all impacted upstream and downstream units The profile shall include
the top of wall elevations of each impacted treatment unit and the water surface elevations within each impacted treatment
unit for two flow conditions: (1) the NPDES permitted flow with all trains in service and (2) the peak hourly flow with one
treatment train removed from service.
® Are any modifications proposed that impact the process flow diagram or process flow schematic of the treatment facility?
Yes or❑No. If yes,provide the process flow diagram or process flow schematic showing all modified flow paths including
aeration,recycle/return,wasting,and chemical feed,with the location of all monitoring and control instruments noted
F. ❑ Engineering Specifications*****(Specifications are clearly spelled out on the plans No additional specifications
are required)*****
❑ Per 15A NCAC 02T 0504(c)(2),submit one set of specifications that have been signed,sealed and dated by a North Carolina
Licensed Professional Engineer.
O Specifications must be labeled as follows: FINAL SPECIFICATIONS — FOR REVIEW PURPOSES ONLY — NOT RELEASED FOR
CONSTRUCTION
Specifications shall include:
❑ Specifications for all applicable disciplines needed for bidding and construction of the proposed project (check as
appropriate):
Application for Authorization to Construct Permit(FORM ATC-12-14) Page 3

State of North Carolina
s,y Department of Environmental Quality
r:a
Division of Water Resources
Water Resources
ENVIRONMENTALQUAL,TY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC-12-14)
❑ Civil Not Applicable(On plans)
❑ Process Mechanical ® Not Applicable(On Plans)
❑ Structural ® Not Applicable(On Plans)
❑ Electrical ® Not Applicable(On Plans)
❑ Instrumentation/Controls ® Not Applicable
O Architectural ® Not Applicable
O Building Mechanical ® Not Applicable
❑ Building Plumbing ® Not Applicable
❑ Detailed specifications for all treatment units and processes including piping, valves, equipment (pumps, blowers, mixers,
diffusers,etc.),and instrumentation.(On Plans)
0 Means of ensuring quality and integrity of the finished product including leakage testing requirements for structures and
pipelines,and performance testing requirements for equipment.(On Plans)
O Bid Form for publicly bid projects N/A Small Purchase
G. Construction Sequence Plan
® Construction Sequence Plan such that construction activities will not result in overflows or bypasses to waters of the State.
The Plan must not imply that the Contractor is responsible for operation of treatment facilities List the location of the
Construction Sequence Plan as in the Engineering Plans or in the Engineering Specifications or in both The proposed work
will cause no interruption of current operation The operator will continue adding bagged lime until the chemical feed and
chemical storage tank are installed and operational
H. Engineering Calculations***** (Engineering design basis is attached)***** Items listed below do not apply.
® Per 15A NCAC 02T 0504(c)(3),submit one set of engineering calculations that have been signed,sealed and dated by a North
Carolina Licensed Professional Engineer,the seal,signature and date shall be placed on the cover sheet of the calculations
For new or expanding facilities and for treatment process modifications that are included in Section 4.C,the calculations shall
include at a minimum:
❑ Demonstration of how peak hour design flow was determined with a justification of the selected peaking factor.
❑ Influent pollutant loading demonstrating how the design influent characteristics in Section 4.B.2 of this form were
determined
❑ Pollutant loading for each treatment unit demonstrating how the design effluent concentrations in Section 4.B 2 of this form
were determined
❑ Hydraulic loading for each treatment unit.
® Sizing criteria for each treatment unit and associated equipment(blowers, mixers, pumps, etc.) (Chemical Feed Pump and
chemical storage)
❑ Total dynamic head(TDH)calculations and system curve analysis for each pump specified that is included in Section 4.0 6.
❑ Buoyancy calculations for all below grade structures.
❑ Supporting documentation that the specified auxiliary power source is capable of powering all essential treatment units.
Application for Authorization to Construct Permit(FORM ATC-12-14) Page 4

State of North Carolina
Department of Environmental Quality
Division of Water Resources
Warer Resources
ENVIRONMENTAL QUAL TY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC-12-14)
I. Permits
❑ Provide the following information for each permit and/or certification required for this project
Permit/ If Not Issued Provide
Not Date Date Certification Status and Expected
Permit/Certification Applicable Submitted Approved Number Issuance Date
Dam Safety X
Soil Erosion and Sediment Control X
USCOE /Section 404 Permit X
Water Quality Certification (401) X
USCOE/Section 10 X
Stormwater Management Plan X
CAMA X
NCDOT Encroachment Agreement X
Railroad Encroachment Agreement X
Other. X
J. Residuals Management Plan
Cl For all new facilities, expanding facilities, or modifications that result in a change to sludge production and/or sludge
processes, provide a Residuals Management Plan meeting the requirements of 15A NCAC 021 0504(1) and 15A NCAC 02T
0508;the Plan must include.
❑ A detailed explanation as to how the generated residuals(including trash,sediment and grit)will be collected, handled,
processed,stored,treated,and disposed
D An evaluation of the treatment facility's residuals storage requirements based upon the maximum anticipated residuals
production rate and ability to remove residuals
❑ A permit for residuals utilization or a written commitment to the Applicant from a Permittee of a Department approved
residuals disposal/utilization program that has adequate permitted capacity to accept the residuals or has submitted a
residuals/utilization program application
❑ If oil,grease,grit or screenings removal and collection is a designated unit process,a detailed explanation as to how the
oil/grease will be collected, handled, processed,stored and disposed
® Not Applicable (This is an existing Facility.Changing the way alkalinity is added will not change sludge production.)
Application for Authorization to Construct Permit(FORM ATC-12-14) Page 5

State of North Carolina
r ' °" Department of Environmental Quality
3� ,x
t ' Division of Water Resources
,y.
14iarer Resources
ENVIRONMENTAL OUAL TY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC-12-14)
SECTION 4: PROJECT INFORMATION (N/A Not a New or Expanding Facility)
A. WASTEWATER TREATMENT PLANT FLOW INFORMATION—COMPLETE FOR NEW OR EXPANDING FACILITIES
1. Provide the following flow information•
Plant Flows
Existing Plant Design 0.225 MGD
Current NPDES Permit Limit 0.225 MGD
Current Annual Average MGD
(past 12 months)
For Past 12 Months: For Past 24 Months:
Start Date:month/yr Start Date:month/yr
End Date: month/yr End Date: month/yr
Maximum Month MGD MGD
Maximum Day MGD MGD
Peak Hour MGD MGD
Application for Authorization to Construct Permit(FORM ATC-12-14) Page 6

•
•
f„ State of North Carolina
Department of Environmental Quality
Division of Water Resources
Water Resources
;'Y.1R 0,WLNTF,L -_7 APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC-12-14)
B. WASTEWATER TREATMENT FACILITY DESIGN INFORMATION—COMPLETE FOR NEW OR EXPANDING FACILITIES AND
FOR TREATMENT PROCESS MODIFICATIONS (N/A Not a New or Expanding Facility)
1 Have all of the requirements of 15 NCAC 02H 0100, 15A NCAC 02T, North Carolina General Statute 133-3,North Carolina
General Statute 143-215 1,and Division of Water Resources Minimum Design Criteria for NPDES Wastewater Treatment
Facilities been met by the proposed design and specifications?❑ Yes or® No If no, provide justification as to why the
requirements are not met,consistent with 15A NCAC 02T 0105(n) Reliability is afforded by returning to bagged lime
2 Provide the design influent and effluent characteristics that are used as the basis for the project design,and the NPDES
permit limits for the following parameters Basis of design is presented outside of this document.See attachment. In
Summary,the Operator currently provides alkalinity to the WWTP by adding two 50 LBS bags of lime each day,at 7 days per
week In lieu of 100 lbs of lime we propose feeding the equivalent in a 25%solution of NaOH 45 Gallons of 25%NaOH
provides the same alkalinity as 100 lbs of lime (The table below does not apply)
Project Basis of Design
Design Influent Design Influent
Influent Concentration Load
Concentration- (Must be (Must be
Current Annual supported by supported by
Average(past Engineering Engineering Design Effluent
12 months)if Calculations Calculations Concentration and/or NPDES Permit Limits
Parameter Available [Section 3.H]) [Section 3.H]) Load (monthly average)
Ammonia Nitrogen mg/L Summer mg/L Summer
(NH3 N) mg/L mg/L lb/day
mg/L Winter mg/L Winter
Biochemical mg/L Summer mg/L Summer
Oxygen Demand mg/L mg/L lb/day
(BODS) mg/L Winter mg/L Winter
Fecal Coliform per 100 mL per 100 mL
Nitrate+Nitrite
Nitrogen (NO3-N + mg/L mg/L
NO2-N)
Total Kjeldahl
Nitrogen mg/L
mg/L mg/L
Total Nitrogen
lb/year lb/year
mg/L mg/L
Total Phosphorus mg/L mg/L lb/day
lb/year lb/year
Total Suspended mg/L mg/L lb/day mg/L mg/L
Solids(TSS)
3 Based on the"Project Basis of Design" parameters listed above,will the proposed design allow the treatment facility to
meet the NPDES Permit Limits listed above? Yes or❑ No If no,describe how and why the Permit Limits will not be
met
Application for Authorization to Construct Permit(FORM ATC-12-14) Page 7

State of North Carolina
Department of Environmental Quality
Division of Water Resources
Water Resources
ENVIRONMENTAL QUAL TY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC-12-14)
4. Per 15A NCAC 02T 0505(1), by-pass and overflow lines are prohibited Is this condition met by the design? Yes or❑ No
If no,describe the treatment units bypassed,why this is necessary,and where the bypass discharges.
5. Per 15A NCAC 02T 0505(k),multiple pumps shall be provided wherever pumps are used. Is this condition met by the
design?❑Yes or® No If no, provide an explanation•The backup for Chemical pump is to use bagged lime to provide
needed alkalinity.
6 Per 15A NCAC 02T 0505(1), power reliability shall be provided consisting of automatically activated standby power supply
onsite capable of powering all essential treatment units under design conditions,or dual power supply shall be provided
per 15A NCAC 02H 0124(2)(a) Is this condition met by the design? ❑Yes or® No. If no,provide(as an attachment
to this Application)written approval from the Director that the facility The existing WWTP was built in 1992,and was not
required to have standby power If power goes out,the effluent will not discharge, because the effluent must be pumped
The proposed modification in no way increases capacity of the WWTP. It merely reduces labor by providing a new way to
introduce alkalinity to the WWTP.
➢ Has a private water supply that automatically shuts off during power failures and does not contain elevated water
storage tanks,and
> Has sufficient storage capacity that no potential for overflow exists,and
> Can tolerate septic wastewater due to prolonged detention
7 Per 15A NCAC 02T 0505(o),a minimum of 30 days of residual storage shall be provided. Is this condition met by the
design? ®Yes or❑ No If no,explain the alternative design criteria proposed for this project in accordance 15A NCAC
02T 105(n).This prosect brings no change to the sludge production or sludge management.
8 Per 15A NCAC 02T 0505(q),the public shall be prohibited from access to the wastewater treatment facilities Explain how
the design complies with this requirement:The proposed chemical feed pump is located inside an existing chemical feed
room.The proposed chemical storage is inside a proposed dual walled spill containment tank.Both the pump and the
tank are inside the existing fenced in WWTP Site.
9 Is the treatment facility located within the 100-year flood plain? ❑Yes or® No. If yes,describe how the facility is
protected from the 100-year flood
C. WASTEWATER TREATMENT UNIT AND MECHANICAL EQUIPMENT INFORMATION—COMPLETE FOR NEW OR
EXPANDING FACILITIES AND FOR MODIFIED TREATMENT UNITS
1 PRELIMINARY AND PRIMARY TREATMENT(I e, physical removal operations and flow equalization)
No.of Plan Sheet Specification Calculations
Treatment Unit Type Size per Unit Provided?
Units Reference Reference
(Yes or No)
Manual Bar Screen MGD at peak hourly flow
Mechanical Bar MGD at peak hourly flow
Screen
Grit Removal MGD at peak hourly flow
Flow Equalization -- gallons
Primary Clarifier Circular ft diameter; ft side
water depth
Primary Clarifier Rectangular square feet; ft side
water depth
Other
Application for Authorization to Construct Permit(FORM ATC-12-14) Page 8

1 ,
State of North Carolina
U.
Department of Environmental Quality
Division of Water Resources
•
Warer Resources
ENVIRONMENTAL QUAL TY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC-12-14)
SECONDARY TREATMENT(BIOLOGICAL REACTORS AND CLARIFIERS)(i.e., biological and chemical processes to remove
organics and nutrients)
No.of Plan Sheet Specification Calculations
Treatment Unit Provided?
Units Type Size per Unit Reference Reference
(Yes or No)
Aerobic Zones/
Tanks gallons
Anoxic Zones/
Tanks gallons
Anaerobic
Zones/Tanks gallons
Sequencing Batch
Reactor(SBR) gallons
Membrane
Bioreactor(MBR) -- gallons
Secondary Clarifier Circular ft diameter; ft
side water depth
Secondary Clarifier Rectangular square feet, ft
side water depth
Other
2 TERTIARY TREATMENT
No.of Plan Sheet Specification Calculations
Treatment Unit Type Size per Unit Provided?
Units Reference Reference
(Yes or No)
Tertiary Clarifier Circular ft diameter; ft
side water depth
Tertiary Clarifier Rectangular square feet; ft
side water depth
Tertiary Filter square feet
Tertiary Membrane
Filtration square feet
Post-Treatment
Flow Equalization -- gallons
Post-Aeration gallons
Other
3. DISINFECTION
No.of Plan Sheet Specification Calculations
Treatment Unit Type Size per Unit Provided?
Units Reference Reference
(Yes or No)
gal/day per bank at
Ultraviolet Light (Parallel,in
peak hourly flow;
number of banks,
series) number of lamps/bank
(Gas, gallons of contact
Chlorination
tablet;liquid) tank/unit
Application for Authorization to Construct Permit(FORM ATC-12-14) Page 9

7 State of North Carolina
; Department of Environmental Quality
Division of Water Resources
Warer Resources
ENVIRONMENTAL GLIAL TY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC-12-14)
(Gas; gallons of contact
Dechlorination
tablet,liquid) tank/unit
4. RESIDUALS TREATMENT
No.of Plan Sheet Specification Calculations
Treatment Unit Provided?
Units Type Size per Unit Reference Reference
(Yes or No)
Gravity Thickening square feet, ft side
Tank water depth
Mechanical
Thickening/ dry lb/hour
Dewatering
Aerobic Digestion gallons
Anaerobic
Digestion gallons
Composting dry lb/hour
Drying dry lb/hour
Other
5. PUMP SYSTEMS(include influent, intermediate, effluent,major recycles,waste sludge,thickened waste sludge and plant
drain pumps)
Capacity of
Location No.of Purpose Type each pump Plan Sheet Specification
Pumps GPM TDH Reference Reference
6. MIXERS
No.of Power of Plan Sheet Specification
Location Mixers Purpose Type each MP fixer Reference Reference
Application for Authorization to Construct Permit(FORM ATC-12-14) Page 10

re;7i, .• State of North Carolina
Department of Environmental Quality
. ' Division of Water Resources
Water Resources
ENVIRONMENTAL QUAL TY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC-12-14)
7. BLOWERS
Capacity of
Location No.of Purpose Type each Blower Plan Sheet Specification
Blowers (CFM) Reference Reference
8. ODOR CONTROL
No.of Plan Sheet Specification
Location Units Purpose Type Reference Reference
D. SETBACKS—COMPLETE FOR NEW WASTEWATER TREATMENT STRUCTURES (The only new items are the
Chemical Solution Storage Tank and they comply with the setbacks.)
1. The minimum distance for each setback parameter to the wastewater treatment/storage units per 15A NCAC 02T 0506(b)
are as follows
Is Minimum Distance
Minimum Distance Requirement met by the
Setback Parameter Required from Nearest Design?If"No",identify
Treatment/Storage
Unit Setback Waivers in Item D.2
Below
Any habitable residence or place of assembly under separate 100 ft ®Yes ❑ No
ownership or not to be maintained as part of the project site
Any private or public water supply source 100 ft ®Yes ❑ No
Surface waters(streams—intermittent and perennial,perennial 50 ft ®Yes ❑ No
waterbodies,and wetlands)
Any well with exception of monitoring wells 100 ft ®Yes ❑ No
Any property line 50 ft ®Yes ❑ No
2. Have any setback waivers been obtained per 15A NCAC 02T 0506(d)? ❑ Yes or ® No If yes, have these waivers been
written, notarized and signed by all parties involved and recorded with the County Register of Deeds? ❑ Yes or❑ No. If
no, provide an explanation•None Are Required
Application for Authorization to Construct Permit(FORM ATC-12-14) Page 11

State of North Carolina
•u�=: Department of Environmental Quality
Y Division of Water Resources
Warcr Resources
ENVIRONMENTAL QUAL TY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC-12-14)
SECTION 5: APPLICATION CERTIFICATION BY PROFESSIONAL ENGINEER
Professional Engineer's Certification per 15A NCAC 02T.0105:
I, Cecil G Madden,Jr., P E, attest that this application package for an Authorization to Construct
(Typed Name of Professional Engineer)
for the Maury Sanitary Land District WWTP—Contract No 7—Alkalinity Feed
(Facility and Project Name)
was prepared under my direct supervisory control and to the best of my knowledge is accurate,complete and consistent
with the information supplied in the engineering plans, specifications,calculations, and all other supporting
documentation for this project I further attest that to the best of my knowledge the proposed design has been
prepared in accordance with all applicable regulations and statutes, 15 NCAC 02H. 0100, 15A NCAC 02T, North Carolina
General Statute 133-3, North Carolina General Statute 143-215 1, and Division of Water Resources Minimum Design
Criteria for NPDES Wastewater Treatment Facilities, and this Authorization to Construct Permit Application,except as
provided for and explained in Section 4.B 1 of this Application. I understand that the Division of Water Resources'
issuance of the Authorization to Construct Permit may be based solely upon this Certification and that the Division may
waive the technical review of the plans, specifications, calculations and other supporting documentation provided in this
application package. I further understand that the application package may be subject to a future audit by the Division
Although certain portions of this submittal package may have been prepared,signed and sealed by other professionals
licensed in North Carolina, inclusion of these materials under my signature and seal signifies that I have reviewed the
materials and have determined that the materials are consistent with the project design
I understand that in accordance with General Statutes 143-215 6A and 143-215 6B, any person who knowingly makes
any false statement, representation, or certification in any application package shall be guilty of a Class 2 misdemeanor,
which may include a fine not to exceed $10,000, as well as civil penalties up to $25,000 per violation.
North Carolina Professional Engineer's seal with written signature placed over or adjacent to the seal and dated:
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Application for Authorization to Construct Permit(FORM ATC-12-14) Page 12

State of North Carolina
'I-' Department of Environmental Quality
Division of Water Resources
Water Resources
ENVIRONMENTAL QUALITY APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC-12-14)
SECTION 6:APPLICATION CERTIFICATION BY APPLICANT
Applicant's Certification per 15A NCAC 02T.0106(b):
I, L.A. Move,Jr., District Chairman, attest that this application package for an Authorization to Construct
(Typed Name of Signature Authority and Title)
for the Maury Sanitary Land District WWTP—Contract No.7—Alkalinity Feed
(Facility and Project Name)
has been reviewed by me and is accurate and complete to the best of my knowledge. I also understand that if all
required parts of this application package are not completed and that if all required supporting information and
attachments are not included,this application package will be returned to me as incomplete. I further certify that in
accordance with 15A NCAC 02T.0120(b),the Applicant or any affiliate has not been convicted of environmental crimes,
has not abandoned a wastewater facility without proper closure, does not have an outstanding civil penalty where all
appeals have been abandoned or exhausted, are compliant with any active compliance schedule, and does not have any
overdue annual fees.
I understand that the Division of Water Resources' issuance of the Authorization to Construct Permit may be based
solely upon acceptance of the Licensed Professional Engineer's Certification contained in Section 5, and that the Division
may waive the technical review of the plans,specifications, calculations and other supporting documentation provided
in this application package. I further understand that the application package may be subject to a future audit.
I understand that in accordance with General Statutes 143-215 6A and 143-215.68 any person who knowingly makes
any false statement, representation, or certification in any application package shall be guilty of a Class 2 misdemeanor,
which may include a fine t to exceed$10,000, as well as civil penalties up to$25,000 per violation.
Signature: ��✓� i Date: ,2—
g---/-J-----
t
THE COMPLETED APPLICATION AND SUPPORTING INFORMATION SHALL BE SUBMITTED TO:
NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER RESOURCES/NPDES
By U.S. Postal Service By Courier/Special Delivery:
1617 MAIL SERVICE CENTER 512 N. SALISBURY STREET, 9TH FLOOR
RALEIGH, NORTH CAROLINA 27699-1617 RALEIGH, NORTH CAROLINA 27604
TELEPHONE NUMBER: [phone]
Application for Authorization to Construct Permit(FORM ATC-12-14) Page 13

aada
North Carolina Department of Environment and Natural Resources
Division of Water Quality
Pat McCrory Thomas A Reeder John E Skvarla, III
Governor Acting Director Secretary
July I, 2013
L A Moye, Jr, Chairman
Maury Sanitary Land District
P 0 Box 98
Maury,North Carolina 28554
Subject DRAFT NPDES PERMIT
Permit Number N00061492
Maury Sanitary Land District WWTP—Class II
Greene County
Dear Permittee
Enclosed with this letter is a copy of the draft permit for your facility Please review the draft very
carefully to ensure thorough understanding of the conditions and requirements it contains Your permit is
among several in the Neuse River Basin that the Division has targeted for expedited renewal
Please note the following modifications to this draft:
g, Updated footnotes in Section A (1 ) Effluent Limits and Monitoring Requirements
A statewide Total Maximum Daily Load (TMDL) for Mercury has been approved by the
tiS EPA Municipal wastewater discharges NPDES peiiriits must monitor or limit
Mercury to comply wnl;the TMDL
Please submit any comments to me no later than thirty (30) days following your receipt of the draft
Comments should be sent to the address listed at the bottom of this page If no adverse comments are
received from the public or from you, this permit will likely be issued in mid-August 2013, with an
effecti\e date of Septembei 1, 2013
If you have any questions or comments concerning this draft permit, please contact me at (919)
807-6388 or Maui een KinneycThr ncdenr goy
Sincerely,
Maureen Kinney
c c NPDES Unit
rc Wa:hi ii.non Regional Uflic,e, Surface Watcr Protection Section
Ste\e laid,NCD[-NR
Ser, -;neigh ",'rhi;;rcind27699161
_oc,r,un 512 N Saisoury St Raleigh,North Carolina 27604
One
9919-807-5;,00;FAX [phone] >�j
irrr-mei 'AWN nc,+aiercvar,!y-orq O1 th Carolina
't' irG� � by 1[5'p;,yni

,
Permit NC0061492
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
PERMIT
TO DISCHARGE WASTEWATER UNDER THE
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provisions of North Carolina General Statute 143-215.1, other lawful standards
and regulations promulgated and adopted by the North Carolina Environmental Management
Commission, and the Federal Water Pollution Control Act, as amended,
Maury Sanitary Land District r
is hereby authorized to discharge wastewater from a facility located at the
Maury Sanitary Land District WWTP
NCSR 1401 south of Maury
Greene County
to receiving waters designated as Contentnea Creek in the Neuse River Basin in accordance with
effluent limits, monitoring requirements, and other conditions set forth in Parts I, II, III and IV hereof.
This permit shall become effective ,2013.
This permit and authorization to discharge shall expire at midnight on May 31, 2018.
Signed this day , 2013.
DRAFT
Thomas A Reeder, Acting Director
Division of Water Quality , -
By Authority of the Environmental Management Commission

/
Permit NC006 1 492
SUPPLEMENT TO PERMIT COVER SHEET
All previous NPDES Permits issued to this facility, whether for operation or discharge are hereby
revoked. As of this peinat issuance, any previously issued peiiuit bearing this number is no longer
effective. Therefore, the exclusive authority to operate and discharge from this facility arises under the
peg nit conditions, requirements,terms, and provisions included herein.
Maury Sanitary Land District is hereby authorized to:
1. Continue to operate an existing 0 225 MGD wastewater treatment system with the following
components. -
4 Influent pump station
® Standby power
• Mechanical screening
• Dual grit chamber
4 Oxidation ditch
4 Dual clarifiers
+ Gas chlorination and dechlorination system
4 Flow measurement device
+ Post aeration
4. Sludge pumping station
• Sludge lagoon
The facility is located south of Maury at the Maury Sanitary Land District WWTP on NCSR 1401
in Greene County

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Location
Maury Sanitary Land District WWTP �_ _ '-' ^‘:X
'- . ,
Cont Greene Stream Class C-Swamp,NSW (not to scale)
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Receiving Stream' Contentnea Creek Sub-Basin' 03-04-07
Latitude 35°28'40” Grid/Quad F28NE
Longitude 77°35'10" HUC#' 03020203 NORTH NPDES Permit: NC0061492

/
Permit NC0061492
A (1.) EFFLUENT LIMITS AND MONITORING REQUIREMENTS—DRAFT
During the period beginning on the effective date of this permit and lasting until expiration, the permittee is authorized to
discharge treated wastewater from outfall 001 Such discharges shall be limited and monitored by the permittee as specified
below.
EFFLUENT EFFLUENT LIMITS MONITORING REQUIREMENTS
CHARACTERISTICS
Monthly Weekly Measurement Sample Sample
Parameter Code Average Average Frequency Type Location'
Flow 0 225 MGD Continuous Recorder Influent or
50050 Effluent
Total Monthly Flow (MG/month) Monthly Recorder or Influent or
Calculated Effluent
BOD, 5-Day2 (20 °C)—Summer* 13 0 mg/L 19,5 mg/L Weekly Composite Influent&
C0310 Effluent
BOD,5-Day2 (20 °C)—Winter* 26 0 mg/L 39 0 mg/L Weekly Composite Influent&
C0310 Effluent
Solids,Total Suspended2 30 0 mg/L 45 0 mg/L Weekly Composite Influent
C0530 Effluent
Nitrogen,Ammonia Total(as N)—Summer* 3 0 mg/L 9 0 mg/L Weekly Composite Effluent
C0610
Nitrogen,Ammonia Total (as N)—Winter* 6 0 mg/L 18 0 mg/L Weekly Composite Effluent
C0610
Fecal Coliform(geometric mean) . 200/100 ml 400/100 ml Weekly Grab Effluent
1616 j
Chlorine,Total Residual Daily Maximum 28 pg/L 2/week Grab Effluent
150060
Temperature, Water(CC) Daily(5/week) Grab Effluent
00010
DO 0\ gen, Dissolved
00300yJ Daily Average> 6 0 mg/L Weeklyi Grab Effluent
Phosphorus,Total3 (as P) 2 0 mg/L(Quaiterly Average) 2/month Composite Effluent
C0665
Nitrogen,Total4 (as N) 2/month Composite Effluent
C0600
Total Nitrogen Loads lbs/mo 0/14600Monthly Calculated Effluent
lbs/year QY600 Annually Calculated Effluent
Nitrogen, Kjeldahi.Total (as N) 2/month Composite Effluent
00625
Nitrite+Nitrate Total 1 DET (as N) 2/month Composite Effluent
00630
Monitor and report once dui ing Onceer
Total Mercury this permit cycle (ng/L)using p Grab Effluent
Method 1631E permit cycle
pH Not<6 0 nor>9 0 Weekly Grab Effluent
00-100 Standard Units
Temperature, Water(°C)—(June-Sept Weekly Giab Upstream&
000/0 Dow nsti eam
-
Temperature, Water(°C)—(Oct-11lay) 2/month Grab Upstream &
00010 Downstream
DO, Oxygen, Dissolved—(June-Sept) Weekly Grab Upstream &
00300 Dow'hsti earn
DO, 0Kygen, D,ssol'ed—(Oct-Alun) I 2/month Grab I Upstream &
00300 � l Downstream
*Simiune; Api it 1 —0k-tuber 31
*41'inrer November 1 —Mal 31

I
Permit NC0061492
FOOTNOTES (see next page)
Footnotes:
1. Upstream. at Highway 123 Downstream at the NCSR 1004 bridge All instream monitoring shall be conducted
weekly during the months of June,July,August and September and twice per month during the rest of the year.
2. The monthly average effluent BODS and Total Suspended Solids concentrations shall not exceed 15% of the
respective influent value(85%removal)
3 The quarterly average for Total Phosphorus shall be the average of composite samples collected 2/month during each
calendar quarter(January-March,April-June,July-September,October-December)
4 For a given wastewater sample, TN = TKN + NO,-N + NO3-N, where TN is Total Nitrogen, TKN is Total Kjeldahl
Nitrogen,and NO,-N and NO3-N are Nitrite and Nitrate Nitrogen,respectively.
5. Total Nitrogen Load is the mass load of Total Nitrogen discharged in a given period of time See special condition A.
(2), Calculation of TN Loads
6 A statewide Total Maximum Daily Load (TMDL) for Mercury has been approved by the US EPA Municipal
wastewater discharges with NPDES permits must monitor or limit Mercury to comply with the TMDL
THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS
A. (2). CALCULATION OF TOTAL NITROGEN LOADS
a. The pennittee shall calculate monthly and annual TN Loads as follows.
i. Monthly TN Load (lb/month) =TN x TMF x 8.34
where
TN = the average TN concentration(mg/L)of the samples collected during the month
TMF = toe Total Monthly Flow of wasie\aater discnarged during the month(MG/month)
8 34 = conversion factor,from(mg/L x MG)to pounds
ii. Annual TN Load (lb/year)= Sum of the 12 Monthly TN Loads for the calendar year
b The permittee shall report monthly Total Nitrogen results (mg/L and lb/month) in the appropriate discharge
monitoring report for each month and shall report each year's results(lb/year)with the December report for that year
A. (3). TOTAL NITROGEN ALLOCATIONS
a The following table lists the Total Nitrogen(TN) allocation(s) assigned to, acquired by, or transferred to the permittee
in accordance with the Neuse River nutrient management rule (T15A NCAC 02B 0234) and the status of each as of
permit issuance For compliance purposes, this table does not supeicede any TN limit(s) established elsewhere in this
permit or in the NPDES permit of a compliance association of which the permittee is a co-permittee member
I
ALLOCATIONALLOCATION AMOUNT 0)
TYPE SOURCE DATE STATUS
Estuary(Ib/yr) I Discharge(Ib/yr)
I Base Assigned by Rule 12/7/97, 2,275 4,550 Active
(T15A NCAC 02B 4/1/03
0234) I
Footnote
1 Transport Factor=50%
b Any addition, deletion, of modification of the listed al location(s),(other than to correct typographical errors)'ar any
cnange to active status of any of the listed allocations shall be considered a major modification of this permit and shall
be subject to the public review process afforded such modifications under state and federal rules

t
ADDENDUM TO DRAFT PERMIT
Standard Conditions
•
•
Standard Conditions (Boilerplate Language)will be included with each Final Permit. These
conditions are standard for all individual NPDES wastewater permits. If you would like to
preview these standard conditions,they are available on the DWQwebsite at the link below,
under Hot Topics, NEW NPDES Standard Conditions (November 2011):
http://portal ncdenr org/web/wq/swp/ps/npdes
,

REcEeVEDIDENRIDWR
MAR 1.3 2018
Water Resources
Permitting Section
ENGINEERING DESIGN BASIS
FOR
MAURY SANITARY LAND DISTRICT
ALKALINITY FEED
AT
MLSD WWTP NC0061492
March 5, 2018
PRESENTED
BY
Cecil G Madden, Jr., P.E. \, C A'1 o
\,�\ s O C/,.1 T�ii� McDavid Associates, Inc. p�•o< S S/02��'�'
4 P ••QORq cc,5, % -_:•� y
�4•'per i..<\•<<‘.,5.2
F - 109E Walnut Street = :a SEAL
_.. ., _ • 16359 • —
=Q: SEAT- z_
o• 1972 n= Goldsboro,NC 27530 c-<'<`' F <<"-'..4
�. .-. •G [phone] /ci4/G�MA00��`\• ��
• ' ,, //1111\0 it
��/1/t1 M1/11;\E\\\� Corporate License No. C-131

BACKGROUND
Maury Sanitary Land District operates an existing 0.225 MGD WWTP in Green County off Sylivant
Farm Road. Originally, all drinking water in the service area was provided from groundwater.Now the
source of the water varies.It can be groundwater or surface water When the source is groundwater,
alkalinity is adequate in the influent wastewater to accomplish nitrification When the drinking water
source changes to surface water,the alkalinity in the influent wastewater is not adequate for nitrification.
For the last few years the operator has been supplementing the alkalinity by adding two 50 pound bags of
powdered lime per day, seven days per week. The District requested we evaluate a method to automate
alkalinity feed in order to reduce labor requirements.
ALTERNATIVES CONSIDERED
Lime slaking was eliminated because of the capital cost, and because of the complexity of operation.
Magnesium hydroxide was considered because it is considered the safest of the options.Magnesium
hydroxide will not raise the pH in the WWTP above 9.0 SU. Overdosing the chemical will not hurt the
WWTP. The operator is also not damaged because of contact with the chemical. It is essentially Milk of
Magnesia. However, it is a suspension and must remain continuously mixed.It will easily set up and clog
a chemical feed line.MgOH would also have to be stored in a tank in a heated building. 135 LBS of
MgOH= 100 LBS of the lime this requires 12 to 15 gallons per day or 0.5 to 0.625 gallons per hour
continuously fed.The MgOH costs about$5.00 per gallon based on a 500 gallon shipment. This would
cost approximately$75.00 per day
Caustic Soda(NaOH)was also considered. Care must be used to make only small adjustments to the rate
of chemical feed because unlike MgOH it is easy to over feed the NaOH. Overfeeding can result in
violating the pH limit in the NPDES Permit, and could affect other permit parameters as well.430 LBS of
Caustic= 100 LBS of Lime.At a 50% solution 22.5 gallons of Caustic would be required.At a 25%
solution 45 gallons of Caustic would be required A 50% solution begins to solidify at temperatures in
the mid 50's°F.At a 25% solution the temperature can go down to 0°F. The 25% solution costs
approximately$1.25 per gallon based on 500 gallon shipments.
The owner will have less work and less cost using a 25% solution of Caustic.
DESIGN AROUND CAUSTIC
A single double walled tank is being proposed The double walled tank provides spill containment.There
is no degradation of the Caustic with age.The chemical supplier suggested a minimum tank should be
able to hold 10 days to two weeks of storage. The tank should be polyurethane which is impact resistant
and is compatible with Caustic. We are proposing approximately 60 days of storage.A 3000 gallon tank
provides 66.6 days of storage. Purchasing Caustic in bulk can result in significant savings. The tank must
be able to handle liquids with a 1.9 Specific Gravity. One such tank has dimensions of 104"diameter and
142"height. The tank will be fitted with quick disconnect fittings to eliminate the potential for spilling
during the filling process.A simple 5 gallon bucket can be used as a drip pan following filling of the tank
with the quick disconnect. The tank will be located adjacent to a driveway to allow the chemical supplier

to see both his truck and our storage tank while he is filling the tank This reduces the opportunity for
overflow during filling Tanks of this nature cost between $9,000 and $15,000 depending on accessories.
Plastic-Mart, Snyder, Chemtamer,Plastic Tank Super Store, and Miller Plastics all can provide a 3,000
gallon double walled polyethylene spill containment tank. The double walled tank provides spill
prevention.A 12" slab with two layers of#5 rebar at 9"on center each way will provide a suitable
foundation for the chemical storage tank.
The chemical feed pumps need to be compatible with Caustic, and be able to deliver 45 gallons per day
continuously.This is 1.875 gallons per hour. When feeding Caustic,a peristaltic pump is strongly
preferred over a diaphragm pump. One pump that meets the feed rate requirement is the Blue White A2
Pump with a pump range of 0.045 to 4.5 gallons per hour The chemical feed rate can be adjusted
manually, in small increments based on the pH the daily pH readings that are taken by the operator A
single pump would be used, because the operator can revert to bagged lime as a backup if the pump goes
down. The Flex-A-Prene tubing,which is undulated by rollers typically to cause the pumping action, has
a 2000 to 3000 hour life. Pumps like this cost approximately$3,000 each. They are positive displacement
pumps. TDH is not really an issue. Blue White,Knight,Flex Master,Longer Pumps, and Verderflex all
make peristaltic pumps.
The pump needs a 20 amp 115 volt outlet The outlet is available in the existing chemical feed room. The
chemical feed room was initially used to house the ferrous chloride pump. For many years, in lieu of
operating a chemical feed pump for the ferrous chloride,the District has been simply drip feeding the
ferrous chloride into the wetwell of the return sludge pump station The room has been abandoned for its
original function. Therefore,the room is available for chemical feed of NaOH
A process schematic is attached
SAFETY
Access is restricted to the site by a locked gate. The chemical is stored in a double walled spill
containment tank. The tank is filled using a quick disconnect to reduce the potential for spills.The tank is
positioned so the driver can see both his truck and the tank he is filling There will be an emergency
eyewash in close proximity to the tank and chemical feed pump. The proposed tank is more than 50 feet
from the property line, approximately 500 feet from the closest stream, 900 feet from the closest
residence, and 900 feet from the closest well. A simple 5 gallon bucket can be used as a drip pan
following filling of the tank with the quick disconnect.
FLOODPLAIN MAPPING
The Elevation in the vicinity of the proposed chemical feed tank is approximately 65.
The MSLD WWTP is clearly out of the floodplain Two flood maps are attached
BLUE LINED STREAM MAPPING
Both the USGS Map and the NRCS Maps are provided that show the relationship of the existing WWTP
to the Streams

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Proposed Alkalinity Feed
Distance from Proposed Dual Walled Chemical Feed Tank to Property Line Approximately 115 Feet

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