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Treatment Facility: What You
Should Be Doing Now,”
NEWEA Annual Conference,
Boston, Massachusetts
January 27, 2015

Peckenham, J.M., Pinnette,
J.R., and MacDonald, G., "The
Biosolids White Paper -
Making Objective Science
Accessible”, International
Water Association Specialist
Conference on Biosolids,
Moncton, New Brunswick,
June 25, 2007

Hankins, W.D., Pinnette, J.R.,
Cockburn, D.L., and Weare,
R.E., “Maximizing Wet
Weather Treatment
Capacity, The Greater
Lawrence Sanitary District
Case Study", NEWEA/NYWEA
Joint Spring Conference,
Groton, Connecticut, 2006

Pinnette, J.R., “Odorous and
Greenhouse Gas Emissions
from a Manure Management
System: Evaluation of the
Bion NMS Waste Treatment
System," Biocycle Northeast
Conference, August 19, 2002

Pinnette, J.R., Goodwin, J.P.,
and Tvedt, S., “Enclosed
Biofilter System
Performance," Biocycle
Northeast Conference ‘99,
Portland, Maine, September
13-14, 1999

Pinnette, J.R., “Aeration,
Ventilation, and Indoor Air
Quality at Enclosed
Composting Facilities”,
Biocycle National
Conference, Albuquerque,
New Mexico, May 18, 1999

Pinnette, J. R., “Odor Control
for Biosolids Composting",
BioCycle Northeast
Conference ‘96, Portland,
Maine, September 9-11,
1996

WriGHt-Pierce ==

Engineering a Better Envicanmest

defirey Pinnette, PE

Beneficial Use of Residuals

Biosolids Drying Facility, New England Fertilizer Company / Massachusetts Water
Resources Authority, Quincy, MA

Agitated Bin Composting Facility Improvements, Fairfield, CT

New Composting Facility, Hooksett, NH

Site Assessment of Sludge Processing Facility, Synagro Northeast

Biosolids Drying Facility, New England Fertilizer Company / Greater Lawrence
Sanitary District, North Andover, MA

Storage Facility Preliminary Design, Lewiston-Auburn Water Pollution Control
Authority, Lewiston, ME

Sludge Handling Evaluation, Boothbay Harbor, ME

Agitated Bin Facility, Santa Rosa, CA

Fraser Paper Disposal Options, Madawaska, ME

Tunnel Composting Facility, So. Middleborough, MA

Composting Facility Operations Assistance, Old Orchard Beach, ME
Windrow Composting Upgrade, Durham, NH

Compost Facility Study, Lewiston-Auburn Water Pollution Control Authority,
Lewiston, ME

Biosolids Composting Facility Evaluation, Southern Maine

Cost Model for New Agitated Bin Composting Facility, Hartford, CT

Funding and Regulatory Approval, East London, South Africa

Agitated Bin Composting Facility, Rockland County, NY

Sludge Drying Facility, Fairhaven, MA

Biowaste Composting Evaluation, Lewiston, ME

Compost Facility Planning, Sacramento, CA

Biowaste Composting Facility, Stavanger, Norway

Biowaste Processing Facility Design, Drammen, Norway

Agitated Bin Composting Facility, Kristiansand, Norway

Containerized Composting System Design and Permitting, Keene, NH
Aerated Static Pile Composting Facility and Odor Control Design,

Bar Harbor, ME

Aerated Static Pile Composting Facility Design, Wolfeboro, NH

Aeration Systems Design, Poland, ME

Biomass Ash Permitting and Marketing, Western Maine

Agitated Bin Composting Facilities Study, BFl Organic, Unity, ME

Penley Corner Sludge Composting Facility, Lewiston-Auburn Water Pollution
Control Authority, Lewiston, ME

Aerated Static Pile Composting Facility Evaluation, South Portland, ME

Odor Conirol

STEP Tunnel Odor Control System, Abu Dhabi, UAE

STEP Tunnel Odor Control System, Abu Dhabi, UAE

Primary and Secondary Scrubber Detailed Evaluation, Naugatuck, CT
Facility Plan Update, Fairfield, CT

Pinnette, J.R., Dwinal, C.A.,
Giggey, M.D. and Hendry,
G.E., "Design Implications of
the Biofilter Heat and
Moisture Balance",
Proceedings, 1995 USC/TRG
Conference on Biofiltration,
Los Angeles, California,
October 5-6, 1995

Pinnette, J.R., Dwinal, C.A.,
and Giggey, M.D., “Porosity
of Biofilter Media",
Proceedings, USC/TRG
Conference on Biofiitration,
Los Angeles, California,
October 5-6, 1995

Richardson, C.M., Pinnette,
J.R., and Ecker, J.E., "Working
Biofilters at Composting
Facilities: Moving from Art to
Science", Proceedings,
WEF/AWWA Specialty
Conference on Residual/
Biosolids Management,
Kansas City, Missouri, July
23-26, 1995

Pinnette, J.R., Giggey, M.D.,
Marcy, G.J., and O'Brien,
M.A., "Performance of
Biofilters at Two Agitated Bin
Composting Facilities",
Annual Meeting of the Air &
Waste Management
Association, Cincinnati, Ohio,
June 1994

Giggey, M.D., Dwinal, C.A.,
Pinnette, J.R., and O'Brien,
M.A., “Performance Testing
of Biofilters in a Cold
Climate", Proceedings, Water
Environment Federation
Specialty Conference on
Odor and Volatile Organic
Compound Emission Control,
Jacksonville, Florida, April 24-
27,1994

Richardson, C.M., Durfee,
D.D., Giggey, M.D. and
Pinnette, J.R., "Permitting,
Procurement, and Start-Up
of an Innovative Agitated Bin
Composting Facility“, Annual

WriGHT-Pierce =

Engineering 3 Betler Environment

Jeffrey Pinnette, PE

Odor Control Evaluation and Conceptual Design for New Dewatering Facilities,
Veolia N.A., Poughkeepsie, NY

Packed-Bed Scrubber Evaluation and Odor Control Operational Review, South
Essex Sewer District, Salem, MA

WPCF Odor Control Evaluation and Operational Assistance, Stamford, CT
Odor Control for WWTP Upgrade, Mattabassett District, Cromwell, CT
WWTF Improvements, Dover, NH

WWYFTF Odor Evaluation, Naugatuck, CT

Odor Control Improvements, CSO Storage Tunnel, Narragansett Bay
Commission, Providence, Ri

Odor Control Improvements, New England Organics, Unity Township, ME
Agitated Bin Composting Facility, Coff’s Harbour, NSW, Australia

Odor Control Evaluation, Farmington, CT

Evaluation of Odor Control, Plymouth, NH

Odor Contro! Evaluation, Merrimack, NH

Odor Control Evaluation, Acton, MA

Odor Control Evaluation, Torrington, Wyndham, and Killingly, CT

Biofilter O&M Assistance, Sanford, ME

Primary Clarifier and Odor Control improvements, Portland, ME

Odor Control, Reedy Creek Improvement District, Orlando, FL

WWYTFE Odor Evaluation, Manchester, NH

Odor Control Programs, Augusta, ME

Sepiage

e

Interstate Septic Systems, Rockland, ME

Septage Treatment Facility, Yarmouth, MA

Tri-Town Septage Treatment Facility Improvements, Orleans, MA
Collection System and Treatment Plant Design Report, Falmouth, MA
Conceptual Design Report, New England Processors, Northern New England

Water Quality

WWYTF Toxicity Reduction Evaluation, Rockland, ME
Groundwater Nitrogen Loading Model, Yarmouth, MA
Water Quality and Discharge Assessment, Groton, CT
Secondary Treatment Waiver, Newport, Rl

Waiter Resources

*

Flood Plain Evaluation of the North Nashua River in Vicinity of the Fitchburg
Easterly WWTF, and Letter of Map Revision Submittal to FEMA, Fitchburg, MA

Water

Water Supply, Treatment and Distribution System, Readfield, ME

EXHIBIT A

20-YEAR FACILITY PLANNING STUDY (Phase 1)
CITY OF NASHUA, NEW HAMPSHIRE
WASTEWATER TREATMENT FACILITY
I. Scope of Work

This scope of work has been prepared for assisting the City in continuing its efforts towards
addressing current and future capital planning needs. The Wastewater Facility Planning Study will

include:

e Acomprehensive review of the current and projected future flows and loads,
e An assessment of the plant hydraulic and treatment capacity,

e An assessment of the process and ancillary equipment,

e The identification of potential discharge issues, and

e Identification of future capital improvement needs.

These evaluations will be conducted for the main wastewater treatment facility (WWTF), the wet
weather flows treatment facility (WWFTF), and the solids handling facilities. The tasks detailed
below summarize the proposed investigations in greater detail. We anticipate working with the
City in a step-wise manner with monthly progress meetings, brainstorming on each of the major
task elements, interim technical memorandum that summarize the findings of each task as it is
addressed, and then summarizing all of the findings and recommendations in the Report. The
report will synthesize the individual findings and document the overall implementation plan based

on a detailed review, discussion and approval by the City.

A. Preliminary Planning
1. Meet with City staff to review and confirm overall scope and approach of project.
Conduct brainstorming on each element of the scope of work to identify key
issues to be evaluated or problem issues to be addressed.
2. Review available plant data, including:
a. WWITF Monthly Operating Reports, quarterly toxicity reports, and other
operational data, including all available information on sludge quantities,

for the most recent 5-year period from 2014 through 2019. This will

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include reports for the WWFTF. It is assumed the other CSO facilities
are not part of this facility planning effort.

The current and draft NPDES permits, the status of discharge
requirements at the facility, and the pending application for a new permit.
The latest budget and Capital Improvements Plan (CIP). It is assumed the
City will provide:

e A summary of budgetary expenses over past 5 years by category,
including labor, electrical and fuel use, chemicals, sludge transport
and disposal, replacement parts and equipment, and other
appropriate categories.

e A summary of accounting for the WWTF within the City budget in
terms of funding for normal operations and capital improvements
and provide a summary of outstanding loans.

e The latest version of the Wastewater Equipment Replacement Fund
spreadsheet.

e <A current staffing plan both in terms of overall staffing levels and
structure and specific deployment during each work week.

e A summary of staffing changes over last 10 years.

3. Review past studies and reports including:

a.
b.

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rh

Latest City master planning documents and GIS mapping files,

Latest update of the long-term control plan (LTCP) for CSO abatement,
Pump station upgrade plans,

Capacity Analysis Update (2017)

Inflow and infiltration (I/]) related efforts,

Facility O&M Manual with latest updates particularly for the aeration
upgrade project,

Basis of Design reports for all recent upgrade projects,

Energy audit reports,

Any other relevant reports and studies including the SCADA system
evaluation, and the condition assessment for the interior of the egg-shaped

digester.

2 Wright-Pierce

B. Project Administration and Meetings
1. Each month we will submit a report that details the work performed by the team
on each major task with the monthly project invoice.
2. The following meetings will occur throughout the duration of the project:
a. Eight (8) progress and brainstorming meetings with the project team and
City staff.

b. One project presentation meeting to present final report to City staff.

C. Define Current and Projected Future Influent Wastewater Flows and Loads

1. Analyze influent wastewater flows and loads for the five (5) year period from 2014
through 2019.

a. Trend average, minimum, maximum monthly, peak daily and peak hourly
flows for main WWTF including overall flows, secondary flow and
secondary bypass flow and WWFTF.

b. Trend average, minimum, maximum monthly, and peak daily loading data
for BOD and TSS to the main WWTF and the WWFTF.

c. Document septage flows and loadings and other commercial flows.

d. Summarize all available data for nitrogen, phosphorus or other parameters
in the influent.

2. City to provide future population and development growth projections within the
City’s currently sewered areas, including Tyngsboro, Hudson and any other
municipalities who may discharge to the Nashua system in the future.

3. Based on non-sewered population projections, estimate current and future septage
generation. Consider impacts of sewer extensions into areas currently served by
septic systems.

4, Utilize the results from the current Long Term Control Plan study to estimate
current and future infiltration/inflow flow rates.

5. Project future wastewater flows and loads for a 20-year planning period based on

projected growth and the anticipated impact of any CSO and J/I projects.

12/10/19 3 Wright-Pierce

6.

Prepare technical memorandum summarizing projected growth in residential,
commercial, industrial, and institutional flows. Meet with City staff to review and

finalize memorandum.

D. Analyze WWTF Effluent Quality and Sludge Quantities

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1,

Analyze primary treatment removal rates for BOD and TSS and typical effluent
quality both in terms of concentration and mass loading. Summarize available data
on primary sludge quantities and compare to predicted values based on removal
rates.

Analyze available data on primary effluent nitrogen and phosphorus levels. If
necessary, develop a plan for supplemental nitrogen and phosphorus monitoring to
be conducted by the City (WP has budgeted an allowance of $7,500 for outside lab
effort). Develop a preliminary estimate of nitrogen and phosphorus loadings based.
on. best available information.

Analyze the performance of the secondary system in terms of flows treated, BOD
and TSS removal rates and typical effluent quality in terms of concentration and
loading.

For conditions when the secondary bypass is activated, analyze BOD and TSS
concentration and loading in primary effluent, secondary effluent, and combined
effluent.

Assess discharge permit compliance for the main WWTF both on days with no
secondary bypass and with secondary bypass including BOD and TSS
concentration and loading and effluent disinfection parameters.

Develop a summary of secondary sludge quantities.

Analyze sludge thickening operations for primary and secondary sludges including
capture rates and typical thickened sludge concentrations, flow and _ solids
quantities.

Analyze anaerobic digester performance in terms of solids loading rates, solids

destruction, and gas production.

4 Wright-Pierce

9. Analyze dewatering performance including solids capture, polymer consumption,
and cake solids. Summarize annual average, peak monthly, and peak daily sludge
quantities.

10. For WWFTF flows, summarize available data on BOD and TSS removal rates and

effluent quality in terms of concentration and loading.

E. Conduct Plant Infrastructure Assessment
1. Develop a comprehensive plant infrastructure asset inventory:

a. Assess options for asset inventory database including Excel spreadsheets;
Revit model with Access database; existing CMMS systems in use by
City; proprietary asset management systems; or a hybrid approach.

b. Based on the results of the above sub-tasks, develop a comprehensive
plant infrastructure asset inventory. For budgeting purposes, the use of
Wright-Pierce’s Excel-based Asset Management System has been
assumed. The existing WERF list would be incorporated into the overall
asset inventory. It is assumed the asset inventory will include a
comprehensive inventory of equipment systems, buildings and structures;
electrical control systems; and piping systems as separate worksheets in an
Excel workbook.

c. The initial asset inventory shall be populated with information on the age
of the asset, materials of construction, and typical life to replacement.

2. Conduct condition assessments identifying specific upgrade needs. Condition
assessments will include:

a. Process equipment and piping

i. Process equipment and piping assessment by process engineer(s)
updating remaining life estimates from existing WERF list and
expanding to any smaller equipment system added to inventory.

b. HVAC and plumbing systems will be assessed by a mechanical engineer
specializing in these systems.

c. Buildings, structures and tanks will be evaluated by a combination of

architect and structural engineer.

12/10/19 5 Wright-Pierce

d. Instrumentation, controls and SCADA system components will be

evaluated by an instrumentation engineer.

Electrical power distribution systems will be evaluated by an electrical
engineer. Electrical standby generators will be evaluated by an electrical
engineer and mechanical engineer.

Roadways, access drives, parking areas and walkways will be assessed by

a civil engineer.

3. Each discipline engineer will prepare a memorandum that summarizes the

findings from the site visit including the specific condition assessment results as

well as larger planning issues such as opportunities to improve energy efficiency

or enhance performance and reliability. Provide recommendations for

maintenance, such as coatings and other restorative measures.

F. Comprehensive Plant Evaluation

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1.

Treatment Plant Unit Process Analysis: This subtask includes documentation of

existing conditions (completed under Task F), treatment capacities, present needs,

and anticipated future needs based on appropriate design standards and anticipated

future requirements. Future considerations will include potential effluent standards

based on general EPA permitting trends in the watershed and also the preliminary

draft NPDES permit. The following major systems will be included in the

comprehensive plant evaluation:

a.
b.

a 9

m0 rho

pee

Cet

Influent Screening

Influent Pumping

Grit Removal

Primary Clarification System

Activated Sludge System (blowers, diffusers, RAS/WAS pumping)
Secondary Clarification System

Disinfection

Gravity Thickeners

WAS Sludge Thickening and Storage

Sludge Pumping and Conveyance systems

6 Wright-Pierce

k. Anaerobic Digestion System

1. Sludge Dewatering

m. Wet Weather Treatment Facility (influent screening, pumping, and Actiflo
process)

n. Instrumentation and Control, SCADA System

o. Odor Control Systems

2. Prepare a comprehensive process flow diagram for the main WWTF and the
WWFETF showing all major return flows.
3. Building Systems and Site Evaluation

a. Evaluate WWTF buildings and structures for current condition
(completed under Task F), compliance with applicable codes and
necessary improvements including structural integrity, heating and
ventilation systems, roofing systems, architectural items.

b. Evaluate all existing power distribution and electrical systems, including
transformer(s), MCC's and standby power generation for current condition
(completed under Task F), compliance with applicable codes and identify
necessary improvements for present and future load needs.

c. Review current FEMA flood maps for floodplain and required finished
floor elevations. Assess site conditions (completed under Task F) for

present and recommended future scenarios.

G. Sludge Handling and Disposal/Beneficial Reuse
1. Evaluate existing solids handling and anaerobic digestion operation and assess
impacts of upcoming phosphorus removal and future flows and loads and unit

process changes on the operation.

H. Evaluate alternatives for handling peak wet weather flows through the secondary
treatment process of the main WWTF

1. Evaluate improvements that could be implemented to improve the WWTF’s

capability to handle short-term wet weather peak flows and to recover from these

flows. The improvements to be evaluated are:

12/10/19 7 Wright-Pierce

a. Process modifications to improve mixed liquor settleability and retain solids

within the aeration tanks and/or clarifiers;

I. Evaluate Nitrogen and Phosphorus Removal Alternatives

1.

“vw fF YN

Perform an initial screening of potential phosphorus and long-term nitrogen
removal alternatives.

Calibrate process model.

Perform computer modeling to evaluate enhanced biological phosphorus removal.
Evaluate chemical phosphorus removal alternatives.

After the nitrogen removal technologies have been screened and identified, perform
computer modeling to evaluate the most viable alternatives.

a. Long-term nitrogen removal alternatives will be primarily focused on
processes that can achieve effluent total nitrogen levels between 6 to 10
mg/l.

b. Considerations will be given to future nitrogen removal processes than can
achieve LOT nitrogen levels. However, process modeling will not be
conducted for those processes as part of this facility plan.

Perform a life-cycle cost analysis of each of the viable phosphorus removal
alternatives identified and evaluate the advantages and disadvantages of each. For
budgetary purposes, assume up to 2 phosphorus removal alternatives will be
evaluated in detail.

Perform a life-cycle cost analysis of each of the viable nitrogen removal alternatives
identified and evaluate the advantages and disadvantages of each. For budgetary

purposes, assume up to 2 nitrogen removal alternatives will be evaluated in detail.

J. Development of Recommended Plan

12/10/19

1.

Review overall upgrade needs and anticipated timing and develop overall
implementation plan addressing:
a. Any phasing of improvements based on either anticipated future discharge
criteria changes or anticipated growth in future flows and loads,

b. Summarizing recommended unit process upgrades,

8 Wright-Pierce