NC0063096_Phase 1 Upgrades_20160216

DAVIS • MARTIN • POWELL ditib
ENGINEERS & SURVEYORS
rw
February 11, 2016
Re: Town of Holly Springs, NC
NPDES 0063096
Utley Creek WRF Phase 1 Upgrades
DMP Project 150179 (BF)
Mr. Ron Berry RECEIVED/NCDE NDWR
NCDEQ Division of Water Resources
WQ Permitting Section - NPDES FEB 16 2016
1617 Mail Service Center
Raleigh, NC 27699-1617 Water Quality
Permitting Section
Dear Mr. Berry:
We are in receipt of your January 28,2016 email requesting additional information/clarification regarding
the referenced Authorization to Construct(ATC)Application. We have reviewed your comments and offer
the following responses:
1) Under SECTION 3. I. Permits: There is no indication if 401 or 404 actions are required, most likely
none were require. Please revise the table accordingly.
We revised the Table. The Town received a 404 Permit, and DWR advised that a 401 was not
required.
2) Under SECTION 4. A. —C: Per cover letter this application is invoking expansion to 6.0 MGD and
you are proposing changes, therefore, the appropriate information is required.As far as A. and B.,
the information should reflect current information and could be restating portion of the 2007
information if still applicable. As far as C. it needs to reflect all proposed new/upgraded
construction components that will be installed.
We have filled in sections A&B.
Part C—The new construction/upgraded structures at this time are the new Post Aeration (3)
and Digester#2 modification (5), which have been filled in, along with the Blower section. All
other existing equipment and basins were approved at 6 mgd in the 2007 ATC.
3) Requesting more detailed narrative on chemical addition systems. What are the bases for the
chemical addition amounts at 6 MGD?
Phosphorus Chemical Precipitation
The WRF has successfully used liquid Sodium Aluminate (LSA) to predicate phosphorus for
several years. We analyzed historical dosing rates and found that an average dose of 80 to 94
mL/min per MGD achieved the desired effluent TP. The spreadsheets provided (Tab 4) are
based on molecular weight calculations (WEF BNR Manual) and resulted in slightly more
conservative dosages.
T:336-886-4821..F:336-886-4458• License: F-0245
6415 Old Plank Road., High Point, NC 27265 • www.dmp-inc,com

Town of Holly Springs
ATC Application February 11, 2016 Page 2 of 3
The original 2007 design anticipated a 2 mg/L TP limit,and the new permit has a more stringent
0.5 mg/L TP limit. Chemical precipitation is going to be an ongoing polishing step instead of a
backup for BPR.
The improvements to the ISA feed system include duplex chemical transfer pumps to move LSA
from the existing bulk tank,the new building housing day tanks and dosing pumps for LSA. New
feed lines from the dosing pumps to the final clarifier splitter box will provide better control
and more efficient chemical usage. The Chemical Building was designed to allow delivery and
handling of totes,which can used if the bulk tank requires maintenance.
Supplemental Carbon Feed
The original 2007 design anticipated a 6 mg/L TN limit, and the new permit has a slightly more
stringent 5 mg/L TN limit. The BNR process has demonstrated it capable of meeting the new
limit, but the Town desires the ability to feed supplemental carbon to enhance denitrification.
MicroC 2000 was selected due to its inherit safety compared to other supplemental carbon
sources. Feed rates and dosages were based on investigations and discussions with the MicroC
vendor.
The WRF will have the ability to feed MicroC at between the BNR Aeration Basins and Second
Anoxic Zones. The New Chemical Building is designed with a Day Tank and multiple feed pumps
dedicated to each feed point.
Initially the WRF will purchase MicroC in totes as long term dosages are determined. The
Chemical Building was designed to allow delivery and handling of the totes. As influent flows
increase and more operational history is developed with the chemical, the construction of a
bulk storage tank might be justified.
We have revised the Dosing Calculations page (Tab 4) for Denitrification to correctly identify
chemical feed rates at 6 MGD.
4) Did not see mechanical drawing details on chemical addition points other than generic reference
on drawings. Are these addition points existing?If points are being move or are new then need
drawing detail.
All of the feed points shown on Sheet C-2 are new construction. Sheet M-5 includes a typical
detail (2/M-5) of the piping crossing over the wall into the basin. We will clarify the call outs
on Sheet C-2 to refer to the correct detail.
The existing LSA piping to the secondary clarifier distribution box will be removed and those
lines abandoned.

. .
•
Town of Holly Springs
ATC Application February 11, 2016 Page 3 of 3
5) Drawing S-10 shows sump for containment, where does this sump go?
These sumps are designed without drain lines. The Operators will use a small portable sump
pump to remove ordinary wash-down drainage and return it to the head of the plant. In event
of a chemical spill,it would be pumped out into a'container or truck for disposal or recycling.
6) For clarity please provide list of items being demolished and/or remove from service.
Existing Cascade Structure—Demolish
Existing LSA feed pumps—Remove from service
Existing LSA feed piping at Clarifier Splitter—Remove from service
Existing Digester#2 floating mixer,aeration piping,diffusers—Demolish/Remove
7) For digester#2 air demand, it is not clear what is the source of air. Is a new blower being installed
or are you using exiting air sources?If using existing air sources then you need to demonstrated
impact to overall facility air demand.
There are three(3) existing centrifugal blowers located to the southwest corner of Digester#2
(see sheet C2) which are dedicated to Digester #2. Each blower is rated at 2690 ICFM. See
enclosed blower curve and Data Sheet for Tab 6.
8) Could not locate construction sequence plan. Need to know details on how relocated outfall and
cascade system will be put in service and retired outfall will be decommissioned.
The construction sequence is located in Spec Section 0152 25(pages 6&7). A copy is enclosed.
9) Per the submitted application, buoyancy calculation were conducted. Please provide copies to
attach to the application.
Buoyancy calculation for the cascade structure is enclosed. That is the only applicable structure
in the project.
We trust this information is complete and will allow you to continue review of ATC Application. Should
have questions or require additional information please do not hesitate to contact our office.
Sincerely,
DAVIS • MARTIN • POWELL&ASSOCIATES, INC
Ben Palmer, PE
C: Mr. Charles Simmons, Holly Springs
Mr. Seann Byrd, Holly Springs
File
P:\2015\1501791Permits\ATC1150179-ATC Comment Responses(1-29-16).docx

'41t _
State of North Carolina
.;VorthCa-dina'DIVI5.1011.of Water Resources-Y Department of Environment and Natural Resources
rtg `' ''
Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC-12-14)
® °Detailed specifications for all treatment units and processes including piping, valves, equipment (pumps, blowers, mixers,
diffusers,etc.),and instrumentation.
® Means of ensuring quality and integrity of the finished product including leakage testing requirements for structures and
pipelines,and performance testing requirements for equipment.
® Bid Form for publically bid projects.
G. Construction Sequence Plan
O 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: Spec Section 01 52
25,pages 6&7
H. Engineering Calculations
® 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.
O Influent pollutant loading demonstrating how the design influent characteristics in Section 4.B.2 of this form were
determined.
O 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.)
• Total dynamic head (TDH)calculations and system curve analysis for each pump specified that is included in Section 4.C.6.
® Buoyancy calculations for all below grade structures.
❑ Supporting documentation that the specified auxiliary power source is capable of powering all essential treatment units.
I. Permits
O 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 Permit12/10/15 SAw 2015- RECEIVED/NCDEQ/DV/R
02517
Water Quality Certification (401) X RECEIVED/NCDEQ/DWR FEB 16 2016
USCOE/Section 10 X FEB. 1 6 2016 Water Quality
Stormwater Management Plan X Water Quality Permitting Section
CAMA X Permitting Section
Application for Authorization to Construct Permit(FORM ATC-12-14) Page 4

--- State of North Carolina
oNorthCa�dina Divistor� of`VUate6°Resources =,
Department of Environment and Natural Resources
Yr Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT(FORM ATC-12-14)
NCDOT Encroachment Agreement X
Railroad Encroachment Agreement X
Other:
J. Residuals Management Plan
❑ 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 02T .0504(j) and .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.
❑ 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.
SECTION 4: PROJECT INFORMATION
A. WASTEWATER TREATMENT PLANT FLOW INFORMATION—COMPLETE FOR NEW OR EXPANDING FACILITIES
1. Provide the following flow information:
Plant Flows
Existing Plant Design 6.0 MGD
Current NPDES Permit Limit 2.4/6.0/8.0 MGD
Current Annual Average 1.925 MGD
(past 12 months)
• For Past 12 Months: For Past 24 Months:
• ° ° Start Date: 1/1/2015 Start Date: 1/1/2014
End Date: 12/31/2015 End Date: 12/31/2014
Maximum Month 2.24 MGD 1.96 MGD
Maximum Day 2.99 MGD 3.03 MGD
Peak Hour 5.95 MGD 5.95 MGD
Application for Authorization to Construct Permit(FORM ATC-12-14) Page 5

State of North Carolina
NorthCacdina',pIV151011.:Qf'Water°ResoWrces: Department of Environment and Natural Resources
Division of Water Resources
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
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):
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:
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 1.0 mg/L Summer 1.0 mg/L Summer
(NH3 N) 33 mg/L 40 mg/L lb/day
2.0 mg/L Winter 2.0 mg/L Winter
Biochemical 5.0 mg/L Summer 5.0 mg/L Summer
Oxygen Demand 290 mg/L 300 mg/L lb/day
(BODS) 10.0 mg/L Winter 10.0 mg/L Winter
•Fecal Coliform `°x •• - L't:=��:'` 25 per 100 mL 200 per 100 mL
_`�f." ��'�°' ._. '. .°,�um mom_ •le,..�`i�'8 a.,. _
Nitrate+Nitrite ° 78�•• '.` ` ..•1:., e°•• ,
Nitrogen(NO3-N + • ;•a: ° pt :, p .,• • ° ° • 3.0 mg/L N/A mg/L
NO2-N)
Total Kjeldahl t i, vice .. 1{'' e • . ° • ' •° • •• . e • . '
56 mg/L r •e��'° •,,,, ° • • •
Nitrogen °e° Q,., " ° ° •
����, •4 0 *�.°. :. :r. =r;r° . •
4.0 mg/L 5.0 mg/L
°
Total Nitrogen •-••••,;;:. ; • ••,,. c .� ' . ° • ,
sae , e��;�,...g„ • r ,�;�.�
<s_ • _ N/A lb/year N/A lb/year
0.20 mg/L 0.5 mg/L
Total Phosphorus 7.1 mg/L 10 mg/L lb/day
N/A lb/year N/A lb/year
Total Suspended 268 mg/L 300 mg/L lb/day 10.0 mg/L 30.0 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: °
4. Per 15A NCAC 02T.0505(I), 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:
•
Application for Authorization to Construct Permit(FORM ATC-12-14) Page 6

. _ . -: .. State of North Carolina
`kNort.h..dina`DNI$IOfl of`UU ter°Resources _,.
�, .�. Department of Environment and Natural Resources
-, " '
-..•.�" �__�-� __ Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC-12-14)
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:
° 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:
D 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
D 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):
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:Site is fenced with security gate
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: all structures are elevated above the 100 year flood elevation
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
Screen MGD at peak hourly flow
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 7

State of North Carolina
�V" h Ca dins alvislon.of Water'Resources:
Department of Environment and Natural Resources
•
Division of Water Resources
' APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC-12-14)
2. 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/ gallons No
Tanks
Anoxic Zones/ gallons No
Tanks
Anaerobic
Zones/Tanks gallons No
Sequencing Batch
Reactor(SBR) gallons No
Membrane
Bioreactor(MBR) gallons No
Secondary Clarifier Circular ft diameter; ft side No
water depth
square feet; ft side
Secondary Clarifier Rectangular No
water depth
Other No
3. 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 No
water depth
Tertiary Clarifier Rectangular square feet; ft side No
water depth
Tertiary Filter square feet No
Tertiary Membrane
Filtration square feet No
Post-Treatment gallons No
Flow Equalization
Post-Aeration 1 Cascade 18 ft W x 20 ft L gallons M-1 N/A Yes
Other No
4. 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 peak
Ultraviolet Light (Parallel; in hourly flow; number of No
series)
banks; number of
lamps/bank
(Gas; gallons of contact
Chlorination No
tablet; liquid) tank/unit
Dechlorination (Gas; gallons of contact No
tablet; liquid) tank/unit
Application for Authorization to Construct Permit(FORM ATC-12-14) Page 8

State of North Carolina
,vorthca-dina piVISIQn'of Water ResO rte's Q; Department of Environment and Natural Resources
•
•
yT � Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC-12-14)
5. RESIDUALS TREATMENT
No.of Plan Sheet Specification Calculations
Treatment Unit Type Size per Unit Provided?
Units Reference Reference
(Yes or No)
Gravity Thickening square feet; ft side No
Tank water depth
Mechanical
Thickening/ dry lb/hour No
Dewatering _
Aerobic Digestion 2 Circular (#2)=910,600 and (#1)=460,500 M-4 46 5146.16 Yes
gallons
Anaerobic gallons No
Digestion
Composting dry lb/hour No
Drying dry lb/hour No
Other No
6. PUMP SYSTEMS(include influent, intermediate, effluent, major recycles,waste sludge,thickened waste sludge and plant
drain pumps)
No.of Capacity of Plan Sheet Specification
Location Purpose Type each pump
Pumps GPM TDH Reference Reference
7. MIXERS
No.of Power of Plan Sheet Specification
Location Mixers Purpose Type eac(hH fixer Reference Reference
Application for Authorization to Construct Permit(FORM ATC-12-14) Page 9

:= 'N =_
" � :=a'- State of North Carolina
)fi,—hCatdina DiOsJGn`of.aWAter Resour eS
:� • Department of Environment and Natural Resources
5uf - 't-.f.—r4.,.:::,.:;',,44 .
-.-� :; Division of Water Resources
APPLICATION FOR AUTHORIZATION TO CONSTRUCT PERMIT (FORM ATC-12-14)
8. BLOWERS
Capacity of
No.of Plan Sheet Specification
Location Blower
Blowers Purpose Type each Reference Reference
(CFM)
Digester#2 3 Aeration/Mixing Centrifugal 2690 N/A N/A
Digester#1 2 Aeration/Mixing PD 1790 N/A N/A
9. ODOR CONTROL
Location No.of Purpose Type Plan Sheet Specification
Units Reference Reference
D. SETBACKS–COMPLETE FOR NEW WASTEWATER TREATMENT STRUCTURES
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 Setback Waivers in Item D.2
Unit
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:
Application for Authorization to Construct Permit(FORM ATC-12-14) Page 10

RECEIVED/NCDEQIDWR
FEB 16 2016
SECTION 01 52 25 Water Quality
MAINTENANCE OF PLANT OPERATIONS Permitting Section
PART 1- GENERAL
1.01 REQUIREMENT
A. The existing plant will be maintained in continuous operation by the Owner during the entire
construction period as hereinafter specified. The intent of this section is to outline the minimum
requirements necessary to provide continuous treatment of all wastewater throughout the
construction period.
B. Work shall be scheduled and conducted so as not to impede any treatment process, reduce the
quality of the plant effluent or cause odor or other nuisance. In performing the work shown and
specified, the Contractor shall plan and schedule his work to meet the plant operating
requirements, and the constraints and construction requirements as outlined in this Section. No
discharge or spillage of wastewater shall be allowed. The Contractor shall pay all civil penalties,
costs, assessments, etc., associated with any discharge or spillage of raw or inadequately
treated wastewater associated with the Contractor's work.
C. The General Contractor shall be responsible for coordinating the general construction and
electrical, HVAC and plumbing construction schedules and for ensuring that permanent or
temporary power is available for all existing, proposed, and temporary facilities that are required
to be on line at any given time.
D. The Contractor has the option of providing additional temporary facilities that can eliminate a
constraint, provided it is done without cost to the Owner and provided that all requirements of
these Specifications are fulfilled. Work not specifically covered in the following paragraphs may,
in general, be done at any time during the contract period, subject to the operating requirements
and constraints and construction requirements outlined hereinafter. All references to"days"
shall be"consecutive calendar days".
1.02 GENERAL CONSTRAINTS
A. The Contractor shall schedule the Work so that the plant is maintained in continuous operation.
All treatment processes shall be maintained in continuous operation during the construction
period except during approved process interruptions. Process interruptions shall only be as
approved by the Engineer. The Raleigh Regional Office must approve and be notified at least
48 hours in advance of any process being taken out of service.
B. The scheduling of tie-ins and connections that require process interruptions or removing tanks
from service and the allowable duration of such activities shall be dependent on process
operations and performance requirements, flow of wastewater, and previous/current/forecasted
weather as related to flow rate. Scheduling of connections and allowable duration of outage
shall be field dependent on circumstances and shall be as approved by the Engineer. Process
interruptions shall normally be required to be scheduled during periods of low flow which is
typically at night or in the early morning hours (11 pm to 5 am). All night work, overtime, and
costs related to scheduling of process interruptions shall be provided by the Contractor at no
additional cost to the Owner.
C. Individual tanks, pumps, pipes, etc. shall be removed from service to complete the required
work in accordance with the specified operating requirements and constraints and construction
requirements herein.The Contractor may interrupt plant flow for limited periods by allowing
plant flow to fill a previously emptied tank upstream within the Plant provided that shutdown of
tanks and equipment is in accordance with specified requirements and that the emptying and
filling operation and schedule is acceptable to the Owner and Engineer. No more than one (1)
shutdown involving emptying/filling of tanks shall be allowed per week. Consecutive shutdowns
shall be at least 7 days apart. The process and scheduling of emptying/filling of tanks shall be
controlled by Owner personnel, but Contractor shall furnish, install, and operate dewatering
equipment. If the work cannot be completed by such methods, then the Contractor shall provide
appropriate diversion facilities to be approved by the Engineer at no additional cost to the
Owner. The Contractor shall notify the Owner of any interruption of service to any process
DMP Project 150179 01 52 25- 1

equipment due directly or indirectly to his activities and immediately repair or place into service
temporary facilities until permanent repairs are performed or installed.
D. Tanks shall only be removed from service as allowed by the Engineer. When a tank is removed
from service related to the construction, the Contractor shall be responsible for cleaning the
tank acceptable to the Engineer.
E. If in the judgment of the Engineer a requested shutdown is not required for the Contractor to
perform the Work, the Contractor shall utilize approved alternative methods to accomplish the
Work. All shutdowns shall be coordinated with and scheduled at times suitable to the Engineer.
Shutdowns shall not begin until all required materials are on hand and ready for installation.
Each shutdown period shall commence at a time approved by the Engineer, and the Contractor
shall proceed with the Work continuously, start to finish, until the Work is completed and normal
plant operation is restored. If the Contractor completes all required Work before the specified
shutdown period has ended, the Owner may immediately place the existing system back into
service.
F. The Contractor shall schedule tank, equipment, piping, etc., shutdowns in advance and shall
present all desired shutdowns in the 30 and 60 day schedules at the progress meetings.
Shutdowns shall be fully coordinated with the Engineer at least 7 days before the scheduled
shutdown. THE OWNER'S PERSONNEL SHALL OPERATE OWNER'S FACILITIES
INVOLVED IN THE SHUTDOWNS AND DIVERSIONS.
G. Any temporary work, facilities, roads, walks, protection of existing structures, piping, blind
flanges, valves, equipment, etc.that may be required within the Contractor's work limits to
maintain continuous and dependable plant operation shall be furnished by the Contractor at the
direction of the Engineer at no extra cost to the Owner.
H. The Engineer shall have the authority to order Work stopped or prohibited that would, in his
opinion, unreasonably result in interrupting the necessary functions of the plant operations.
I. If the Contractor impairs performance or operation of the plant as a result of not complying with
specified provisions for maintaining plant operations, then the Contractor shall immediately
make all repairs or replacements and do all work necessary to restore the plant to operation to
the satisfaction of the Engineer at no additional cost to the Owner. Such work shall progress
continuously to completion on a 24-hour per day, seven work days per week basis.
J. The Contractor shall provide services of emergency repair crews on call 24-hours per day.
K. Where completion of proposed process tankage, installation of proposed equipment, etc. is
required to proceed with construction activities, the work shall be completed including all
punchlist items. Once a unit process, tank, or piece of equipment is placed into service, the
Contractor shall not be permitted to remove the unit process, tank, or piece of equipment to
complete remaining work or punchlist items.
1.03 GENERAL OPERATING REQUIREMENTS AND CONSTRAINTS
A. Access to Plant Site, Roadways, and Parking Areas-An unobstructed traffic route through the
Main Gate and access roads shall be maintained at all times for the Owner's operations
personnel and maintenance equipment. All construction related traffic including all deliveries,
vehicles driven by contractors personnel, subcontractor personnel, or suppliers, shall enter the
plant through the main gate.Temporary roads shall be maintained to allow for plant utility
vehicles.
1. The Contractor shall provide a parking areas for all construction-related vehicles, locate all
construction trailers, and locate all stored materials in the areas indicated on the Contract
Drawings. The Contractor shall provide for his personnel parking in the offsite areas.
Deliveries and parking on the plant site for construction equipment and construction
related vehicles shall only be as approved in advance by the Owner. The Contractor shall
provide temporary on-site parking as necessary and as approved by the Engineer.
2. The Contractor shall maintain the parking and storage areas to minimize dust and mud in
these areas. All mud placed on existing paved roads on-site shall be washed at the
Contractor's expense as directed by the Engineer. The Contractor shall apply water to
control dust and shall use stone or other approved method to limit mud transported on
DMP Project 150179 01 52 25-2

and/or off site by construction vehicles. The Contractor shall remove and stockpile topsoil
for the construction of the storage area for construction materials and parking area. The
Contractor shall restore these areas to their original condition at the end of the contract.
The Contractor shall be responsible for providing access to and for preparing and
maintaining approved parking areas.
3. An unobstructed traffic route around the plant site shall be maintained at all times for the
Owner's operations personnel and maintenance equipment. Electric utility vehicle and
truck access to the treatment units and buildings for Owner personnel shall be maintained
at all times by the Contractor.
4. The Contractor shall provide temporary measures to protect the existing pavement by
filling over with earthen material or supplying other measures acceptable to the Engineer,
and the Contractor shall repair any damage to existing paved surfaces that occurs during
the construction period. Any areas disturbed along the shoulders of the access road and
interior roads and elsewhere inside and outside of the plant shall be repaired, graded,
seeded, etc. as necessary.
5. The Contractor shall not undertake the restoration/construction of new roadway(paved,
gravel, or asphalt overlay)shown on the Contract Drawings, until all other work on the
plant improvements has been completed.
B. Personnel Access-Treatment plant personnel shall have access to all areas which remain in
operation throughout the construction period. The Contractor shall locate stored material,
dispose of construction debris and trash, provide temporary walkways, provide temporary
lighting, and other such work as directed by the Engineer to maintain personnel access to areas
in operation. Access and adequate parking areas for plant personnel must be maintained
throughout construction.
C. Plumbing Facilities- Unless otherwise allowed by the Engineer, sanitary facilities in the existing
structures shall be operational at all times for plant operating personnel. Contractor shall provide
sanitary facilities for Contractor personnel and all associated construction personnel.The
Contractor shall provide bottled water for drinking water supply for all construction-related
personnel. The Contractor shall provide portable toilets and all associated service for use by
construction-related personnel.All other building plumbing systems such as roof and floor
drains, pumping, etc., shall be maintained for all structures. The rerouting of the sanitary sewer
line from the existing operations building to headworks must be performed before the existing
sewer line is demolished for the construction at the splitter box.
D. Building Heating and Ventilating - Building heating and ventilating for the existing plant
structures shall be in service for the entire construction period. Additional temporary heating and
ventilation shall be provided as required to maintain facilities under construction adequately
heated and vented as directed by the Engineer. The temperatures to be maintained in any
areas occupied by plant operating personnel such as offices, lunchrooms, locker rooms,
bathrooms, etc., shall be at least 65F. The temperatures to be maintained in all other interior
plant areas, whether new, existing or temporary, shall be maintained at a minimum of 55F.
E. Power, Light and Communications Systems- Electric power, lighting service and
communications systems shall be maintained in uninterrupted operation in all areas which
remain in operation. Individual units may be disconnected as required for replacement in
accordance with requirements herein, but service shall be available at all times. The Owner may
allow interruptions of electrical service to multiple units of up to a few hours depending on the
process units which will be taken out of service and the need for these units for maintaining
plant operations.
1. Electrical work shall be planned and scheduled to minimize the time that utility power
service to the Plant is interrupted and the time that electrical service to MCC's and
individual process units is interrupted.
2. When the Utility power must be interrupted to a portion of the plant to complete work, the
Contractor shall coordinate with the Engineer whether or not interruption of electrical
service for the stated purpose and or the requested time is necessary. If power can be
interrupted, the Contractor shall arrange through the Engineer for filling a previously
DMP Project 150179 01 52 25- 3

emptied tank as approved by the Engineer which provides adequate filling time to
complete the work required.
3. Temporary electrical facilities shall be furnished by the Contractor as required to complete
the work at no additional cost to the Owner. Proposed temporary electrical facilities shall
be reviewed with the Engineer and shall comply with requirements specified for the
permanent electrical facilities including wire size, conduit, supports, and protective devices.
Temporary electrical facilities shall be installed according to all national, state and local
code requirements and shall be clearly identified by signs, flags, etc. Temporary facilities
shall be protected from damage from construction or plant operations activities and shall
be installed in such manner to provide safe working conditions for Owner's operating staff.
4. Reassignment of breakers in the main switchgear and major wiring/panel revisions shall
be fully communicated with the Owner within one day after the modifications are
completed. The Contractor shall schedule a coordination meeting through the Engineer
with Owner personnel each time a breaker in the main switchgear is assigned to a different
use or a new MCC is placed into service. The Contractor shall post temporary identification
signs and instructions after breaker modifications and panel modifications are started to
communicate modifications to both Contractor construction and Owner operating
personnel.
5. Owner's phone service to the plant shall be maintained in continuous operation during
construction.
F. Draining Tanks, Process Pipes and Conduits (General)-The contents of all tanks and of all
pipes and conduits to be removed, replaced or relocated (or dewatered for a specific purpose)
shall be transferred to a suitable facility in a manner approved by the Owner through hoses or
piping, or by using pumps if hydraulic conditions so require them. The Contractor shall provide
the pumps, piping and hoses at no additional cost to the Owner. No uncontrolled spillage of a
pipe or conduit shall be permitted.Any spillage from process pipes and conduits, other than
potable water, shall be immediately stopped and contained and then reported to the Engineer
and Owner for instruction for washdown and flushing, washed down and flushed into the
appropriate process flow train (discharge to storm drainage shall be strictly prohibited).
G. The rate of pumpage or drainage into the treatment process shall be as approved by the
Engineer on a case-by-case and shall not exceed 250,000 gallons per day unless specifically
approved by the Engineer. This shall include non-potable (disinfected effluent water from the
effluent end of the UV tank)water used for preloading and testing watertightness of structures.
H. Reclaimed & Potable Water System -Water service shall be maintained in continuous service
at all times during construction except for interruptions required for tie-ins. Shutdown of the
water system shall be fully planned and coordinated with the Engineer and shall be limited to not
more than 2 hours and not more than two such shutdowns per day.
I. Sump Pumps and Sumps-All existing sumps shall be maintained in an operable condition with
either existing pumps or temporary pumps. Interim piping, power and controls shall be provided
as required.
J. Seal Water and Service Water Piping -A supply of service and seal water and the necessary
connections to existing equipment shall be maintained during construction. Interim piping shall
be provided as required.
K. Existing Valves- No existing valve or gate shall be operated by the Contractor. The Owner does
not guarantee that all existing valves and gates wilt close tight or are operable. If a valve or gate
will not close tight, the Contractor shall take whatever steps are necessary to minimize or
prevent leakage which will interfere with the Work or with plant operations. No extra payment
shall be made for such Work which shall be considered as having been included in the Lump
Sum price bid.
L. Temporary Facilities
1. Treatment plant personnel must have ready access at all times to all existing structures.
Temporary facilities shall be any equipment, materials, controls, services and accessories
temporarily needed for access to, and for protection of, all existing structures and
DMP Project 150179 01 52 25-4

equipment, and to maintain an operating system, all in accordance with the provisions of
these Specifications.
2. The size or capacity of the temporary facility shall generally be equal to the size or capacity
of the facility replaced, unless otherwise indicated on the Contract Drawings, or otherwise
directed by the Engineer.
3. All temporary facilities shall be removed when they are no longer required, unless
otherwise noted.
4. To substitute an unscheduled temporary facility for an existing or new facility, the
Contractor shall prepare and submit a plan and description of the proposed temporary
facility to the Engineer, the Contractor shall then submit his notification of intent to
commence work.
5. All costs for all temporary facilities shall be borne by the Contractor.
6. The Contractor is responsible for temporary facilities associated with the completion of his
contract except where otherwise specified.
1.04 SPECIFIC OPERATIONAL CONSTRAINTS
A. The constraints and construction requirements related to continued operation of the treatment
facilities as presented below outline sequencing requirements for some of the major work items.
B. The starting and completion requirements for some of the major work items are summarized in
this subsection to indicate the overall sequence required. These requirements are part of a
phased construction sequence based upon requirements for the process tankage.
C. Placement of Concrete: For the purpose of preloading, placement of concrete shall include all
structural concrete and concrete fill. Concrete for equipment pads, pipe cradles and
miscellaneous equipment supports may be excluded from this at Contractor's option. All
concrete shall have achieved its design compressive strength in accordance with Division 03 of
these Specifications, and also shall be in place a minimum of 28 days prior to filling the
structure with water.
D. Filling Structure With Water: All parts of the structures which are intended to contain water shall
be filled in accordance up to the maximum water level shown for that structure in the Contract
Drawings. Field testing of the water tightness of structures shall be completed at the same time
that the tanks are filled with water for the purpose of preloading the structure. Unless otherwise
approved by the Engineer, structures shall remain filled with water until the monitoring of
settlements is completed as stated below and as approved by the Engineer. No coating and no
process equipment or relative materials shall be installed in the structures until preloading is
completed and accepted by the Engineer.
E. Structures not designed to hold liquid (i.e. valve vaults, equipment pads, etc.)shall not be
hydrostatically tested but shall have no visible leakage from joints or piping penetrations.
F. Structures designed to contain process water(including existing structures which are
structurally modified or have new penetrations below liquid level) shall be tested by the following
procedure:
1. The tank shall be tested for leakage by filling with water to the maximum liquid levels
attained during operation and measuring the drop in level due to leakage. Tanks for
potable water use shall be testing using only potable water.
2. The water level shall be measured after a 48-hour period and then again after a period of
24 hours. The total drop of water level in the tank shall not exceed 1/2 inch in depth. The
source of leakage shall be located and corrected and the structure shall be retested until
this requirement is met.
3. Regardless of the rate of leakage, there shall be no visible leakage or infiltration. The tank
shall be tested for leakage prior to backfilling the structure.
4. These tests shall be performed under the direction and supervision of the Engineer.
5. The Contractor shall pay for water supplied from the utility system for testing unless noted
otherwise.
If an existing structure does not meet the leakage criteria, repairs would be eligible for a
contract change order.
DMP Project 150179 01 52 25-5

G. Monitoring of Settlement for New Process Basins and Tanks: Contractor shall provide all
material, surveying equipment and labor for monitoring and recording of the settlements of the
post-aeration tanks. Settlement monitoring shall be accomplished by"three-wire" leveling or
other survey method approved by the Engineer, to record elevations at the monitoring points to
the nearest 0.001 foot. Monitoring points on each structure shall be located no further than 100
feet apart in a grid pattern, with the perimeter points no further than 25 feet from the exterior
structure wails. Locations of the monitoring points and benchmark points and the method of
survey shall be approved by the Engineer prior to filling the structure with water. Elevations at
the monitoring points shall be recorded and submitted to the Engineer immediately before filling
the structure with water, when the structure is 50%full, immediately after filling the structure
with water, 24 hours after filling the structure, and every two days thereafter until all the primary
settlement has occurred as determined by the Engineer. In no case shall monitoring of each
structure stop in less than seven days from the time the tanks are full, and the Contractor shall
not have any claim for delays due to the monitoring of each structure continuing for up to four
weeks. After the settlement has occurred as determined by the Engineer, the structure shall be
dewatered, and elevations shall then be taken again and submitted to the Engineer and noted
on as-builts prior to connection to any yard piping.
H. General Construction Sequences. All main work items can be scheduled independently without
regard to completion of other main work items. Contractor shall consider delivery of equipment,
readiness of structures, and availability of subcontractors when preparing overall schedule.
1. Reroute of 4" REW (plant non-potable water) prior to May 15, 2015.
a. Coordinate downtime with Owner.
b. Maximum down time allowed is 8 hours.
c. Shut off REW supply to system and drain system.
d. Install new piping and return to service.
2. Relocation of Avent Ferry Force Main (AFFM) prior to July 1, 2016.
a. Allowed downtime for Avent Ferry Pump Station is from 11:00 PM to 5:00 AM.
b. Provide method to dewater forcemain from 16" PV at back gate to point of tie-in,
contain product, and transport to sanitary sewer for treatment.
c. Contractor shall submitted a detailed tie-in plan so that Owner can arrange.
d. All materials shall be at the site prior to starting tie-in.
e. Lay new 20" pipe to tie-in points on each end.
f. Return to service.
3. New Cascade Aerator
a. Structure construction is independent of plant operations.
b. Contractor to block effluent flow in UV outlet box.
c. Excavate and construct new structure.
d. Install new 36" PE.
e. Install 42" DIP PE and outlet channel after AFFM relocation is complete.
f. Coordinate relocation of instruments and samplers.
g. Divert flow to new cascade structure.
4. New Chemical Feed Building
a. Structure construction is independent of plant operations.
b. Relocate existing utilities prior to construction
c. Install chemical duct bank and feed piping to application points
d. Install chemical duct bank and piping to bulk tank
e. Install transfer pumps
f. Test feed system with clean water
g. Test transfer system
h. Place into service
i. Abandon/demo existing feed system components
5. Digester#2 Modifications
a. Coordinate basin availability with Owner.
b. Owner will remove sludge and clean basin.
DMP Project 150179 01 52 25-6

c. Contractor remove existing aeration and mixing equipment.
d. Install new aeration system equipment.
e. Clean water testing.
f. Return to service.
6. Sludge Cake Conveyance & Loading
a. Digester#2 must be returned to service before interrupting dewatering operations.
b. Complete conveyor support superstructure.
c. Extend concrete pad and install wheel rails.
d. Install conveyors DSC-2 and DSC-CC.
e. Modify DSC-1.
f. Install roof structure.
g. Return to service.
7. Aeration Basin Catwalk/Bridge
a. Structure construction is independent of other tasks.
b. Basin#3 will be in operation at beginning of project.
c. Install catwalk over Basin#2, complete electrical and instrumentation.
d. Owner will transfer process flow to Basin#2.
e. Owner will stabilize operation in Basin#2 (minimum of 3 weeks).
f. Install catwalk over Basin#3, complete electrical and instrumentation.
8. Demo abandoned Cascade Aerator
a. Relocate existing instruments to UV Channel and place in service.
b. After new cascade is in service relocate remaining instruments.
c. REW piping bypass to occur outside peak irrigation season (April 15 to October 15).
d. Install bypass piping around abandoned cascade.
e. Relocate MOV and adjust REW pump levels in PLC.
f. Demolish cascade structure and restore area.
9. Miscellaneous work items can be performed at any time during the contract period.
I. Plant Instrumentation and Control System
1. The Plant Control System modifications shall be integrated into service while the existing
plant control system is still in service. The plant control system must be in service
throughout construction. Any shutdown of any part of the control system shall be
coordinated with and approved by the Engineer.
2. The general sequencing of the installation of the new control system shall be as follows:
a. The new control PLC for the chemical feed (SCP8)shall be installed prior to startup of
the new system.
b. Remote PLC shall be installed, tested, and placed into service prior to operation of the
related equipment and processes. Manual operation of equipment may be necessary
if a remote PLC cannot be connected to the distributed control system when originally
brought into service. The Contractor shall provide for a portable computer to interface
with the PLC and download data as needed until the PLC can be permanently
connected to the distributed control system.
c. All the equipment shall be capable of being operated manually by placing the HOA
switch into hand position and the local start/stop switch into start position.
d. Contractor shall install all conductors between SCP3 in UV building and new cascade
before relocating instruments or diverting flow.
e. SCADA reprogramming shall be scheduled to minimize downtime of any
communications and reporting functions.
3. The Contractor shall identify existing instruments that shall be reused. Temporary facilities
shall be removed and permanent facilities restored after the new control system is placed
into service and is accepted.
PART 2- PRODUCTS (NOT USED)
PART 3- EXECUTION (NOT USED)
END OF SECTION 01 52 25
DMP Project 150179 015225-7

T7.fb y
Dosing Calculators for Denitrification
TN Total Nitrogen TN=TKN+NO3-N+NO2-N
TKN total Kjeldahl Nitrogen
NO3-N Nitrate(TOHS process control)
NO2-N Nitrite
NH3 ammonia
Recent Operating Data(2013 to 2015)
averages LBs @ 2 MGD LBs Cad 6 MGD LBs Cal 8 MGD
TN,mg/L 6.1 102.1 306.2 408.3
TKN,mg/L 1.1 17.7 53.0 70.7
NO3-N,mg/L 3.0 50.0 150.1 200.2
NO2-N,mg/L 2.1 34.4 103.1 137.4
Design for 6 MGD
Calculate estimated dose based on target pounds of NO3-N,NO2-N,DO removed •
*Preferred Method
gal/lb NO3-N gal/lb NO2-N , gal/lb DO
MicroC 2000" 0.70 0.42 0.25
Calculator Enter Values Below MicroC 2000"
r-,...,.�.��..-- ;-.ter- .
lbs NO3-N t. :�17if-'. . ;`Yy 15000 105.0
lbs NO2-N ,'''u'fi.i P 3,;f=ti` "7 '.103.00 43.3
lbs DO .;:`_,rte ,.z 1;;Y.J. ;•218.93 53.6
Total Dose-Gallons-> 201.9
Calculate estimated dose based on mg/L of NO3-N,NO2-N and DO removed
*Remember to account for all inputs into the anoxic zone,i.e.NRCY,forward flow,RAS,sidestreams
mg/L per mg/L'NO3-N mg/L per mg/L NO2-N mg/L per mg/L DO
MicroC 2000" 7.12 4.27 2.49
Calculator Enter Values Below MicroC 2000'
mg/L NO3-N1 ;r:'5.00 35.6
mg/L NO2-N , 0.50 2.1
mg/L DO _ -'0.00 0.0
Flow(MGD) , 6.00
Total Dose-mg/L--> 37.73
Total Dose-Gallons--> 185.6
Options for Multiple Feed Points:
Effluent Box of Precent of Flow Feed Rate,GPD GPH mL/min
BNR-1 20% 40 1.7 109
BNR-2 40% 81 3.4 217
BNR-3 40% 81 3.4 217
100% 202 8.4 543
Alternate -
Influent of Precent of Flow Feed Rate,GPD GPH mL/min
2nd Anoxic-1 50% 101 4.2 272
2nd Anoxic-2 50% 101 4.2 272
100% 202 8.4 543
Metering pumps are sized for max of 33 gpd
P:\2015\150179\Doc\Dosing calculations-MicroC 2000.xlsx Dosing-Denite

C_P
1
Holly Springs WWTP 2/11/2016
150179/E-3582
EX DIG-1
Inside Dia 70.00 ft Freeboard SWD
Outer Wal 331.50 17.50 1.50 16.00
Weir Wall-extended 331.50 17.50 1.50 16.00
Inv Sidewall 314.00
Prop Freeboard 1.50
SWD 16.00 ft
Volume 61,575 FT3 Min Air 1,232 CFM
460,583, Gallons
Ignores cone volume
Sanitare Design
SCFM PSIG CFM/kCF BHP Motor HP
1790 6.7 29.07 70 100.00
There are 2 existing blowers dedicated to DIG#1
Prop DIG-2 Ex.INTERCHANGE Conversion
Overall Dia 100.00 ft
Inner Dia - ft
Outer Wall TOC EL 331.50 ft
Weir Wall TOC EL 328.85 ft
Inv EL Sidewall 314.00 ft
Prop Freeboard 2.00 ft
SWD 15.50 ft
Volume 121,737 FT3
910,591 Gallons
Sanitare Design(approx)
SCFM PSIG CFM/kCF Qnty Discs CFM/disc
3,652 6.7 30.0 1856 1.97
There are 3 existing centrifugal blowers dedicated to DIG#2
Each blower is rated at 2690 ICFM at 8 PSIG and fitted with 125 HP drives
Capacity SCFM CFM/kCF CFM/disc
1 blower running 100% 2,690 22.1 1.45
2 blowers running 70% 3,766 30.9 2.03
2 blowers running 100% 5,380 44.2 2.90
Total Digester Volume 1,371,200 Gallons
DMP/mls 150179 3582_Cannibal_Aerobic_Digester_Calc.xls 5 2/11/2016

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