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Collection System: By the Numbers

¢ 446 Miles — Total for Collection System
¢ 81.6 miles combined sewer
¢ 234.4 miles sanitary sewer
¢ 130 miles separate storm

¢ 13 Pump Stations

¢ 9 Combined Sewer Overflow Structures
¢ 4onthe Nashua River
¢ 5 on the Merrimack River

¢ 8 Siphon Chambers

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Wastewater Facility: By the Numbers

¢ Design Flow = 16 million gallons per day

¢ Peak Design Flow = 110 million gallons per sy i
day |

¢ Average Flow = 12 million gallons per day
¢ Total Flow = 4,611 million gallons per year

¢ Total Septage = 800,000 gallons per year

Permits

NPDES (EPA)

NH SQC (NHDES)

MA AOS (MADEP)

Air (NHDES)

AST (NHDES)

UST (NHDES)

Multi Sector General Permit (EPA)

MS4/ NPDES Phase II (EPA)

Hazardous Waste SQG Certification (NHDES)
Hazardous Waste RCRA (NHDES/ EPA)

Governing Documents

Collection System O&M (CMOM/ NPDES)
Long Term Control Plan/ Integrated Plan
(CMOM/ NPDES/ MS4)

Consent Decree (NPDES)

Post Construction Monitoring Plan (NPDES)
Storm Water Management Plan (MS4)
Illicit Discharge Detection and Elimination
(IDDE) Program (MS4)

NOI (MS4/ MSGP)

SWPPP (MSGP)

SPCC (AST/UST)

Planned Future Major Capital Expenditures REQUIRED to Protect
Public Health

¢ Over $85 million in upcoming capital investments are required over the next 5 -
15 years :
¢ Pump Stations Rehabilitation (Phase 2): $5.8 million

CMOM Plan (Capacity, Management, Operation & Maintenance): $5.2 million

Class A Biosolids: $5.0 million

Siphons Repair: $2.0 million

Green Infrastructure for Stormwater Control: $3.0 million

Sewer Infrastructure Program: $30.4 Million ($6 million annually)

Tertiary Treatment (Nutrient Removal and Storage Facility): $5-25 million

These expenditures are REQUIRED to replace aging equipment and infrastructure that keep the City in
compliance with its environmental permits issued by the US Environmental Protection Agency to avoid
costly fines due to permit violations as a result of failed infrastructure.

Hazen 7

Comparison of Nashua Residential Sewer Rates with Selected
Regional Rates (2021)

Estimated Quarterly Household Bill based on water consumption of 20 CCF

Neely FlatFee Fee per CCF Household Quarterly Bill

Nashua $38.33 $2.83 $94.97
Manchester $22.91 $3.75 $97.91
Concord $8.01 $4.49 $97.81
Keene $50.93 $6.29 $176.73
Portsmouth NA $14.89 First 10 CCF: $312.00
then $16.38 per CCF
Salem, NH NA $4.85 per CCF $96.90
Lowell MA NA $4.85 First 50 CCF $96.90
Average Quarterly Bill for Above Cities (not including Nashua) $156.43
2021 NH State Average Quarterly Sewer Bill** $191.25

**Source: UNC Environmental Finance Center, NH Wastewater Rates Dashboard
(CCF = Hundred Cubic Feet) Based on rates as January 1, 2021

Hazen 8

Approved Residential Sewer Rates 2021 through 2023

Rate per CCF $2.83 $3.26 $3.26
Quarterly Flat $38.33 $44.08 $44.08
Charge

Average $94.97 $109.22 $109.22
Household

Quarterly Bill

2021 Average Quarterly Bill for Comparison Cities (not including Nashua) = $156.43
2021 NH State Average Quarterly Sewer Bill = $191.25

Integrated Planning Framework (IPF): Reducing future costs

Integrated Plan

City of Nashua
June 30, 2021

Hazenand Sawyer | City of Nashua — Integrated Plan

Nashua has developed an Integrated Plan Framework (IPF)
and has developed a Dynamic Sewer Rate Model to comply
with its Consent Decree with the US Environmental Protection
Agency:
¢ Prioritizes over 40 capital projects that best address the
most pressing system needs as determined by Nashua
using City-developed criteria. IPF includes all capital
projects linked to a Dynamic Sewer Rate Model
developed for the City by Consultant (Hazen).

¢ Defers capital projects that are determined to have fewer
benefits for similar investment costs.

¢ IPF smooths the “cost curve’ and can mitigate future rate
increases.

Dynamic Sewer Rate Model

Current Accounts and Revenue Distribution

Hazen

OU ial Tate Ce ECHO Ee

a| | RateClassiD 100%

Servicelype C¥_Period

Al Vv All

RateClassiD

All

Account

RateClassiD First RateName Number of Est Annual Usage Annual Revenue

Accounts
(hase)
R | 0625-inch 23,009 131021 $5,642,476
1c |0625-nch 2,006 307,937 $997,447
3C | inh 344 130,106 $633,066
5C | 15inch 317 236,964 $2,162,247
x | 75-inch 264 65,042 $212.99
aR |075-inch 195 39,539 $140,775
6 | inch 194 253,366 $2,846,106
BOR | Well Users 108 6741 $27,120
1RA | 0625-inch 106 10,140 $4716
3R |1-inch 87 27,583 155,008
sR |1.5-inch 83 38.848 $339,415
7c |3einch 28 224,932 $1,164,014
6 {inch 5 27,532 $178913
7R | inch 9 54118 $361,981
BIC | Well Users 9 461 $1,854
SRA | 15-inch 8 7,820 $64,582
aC |dinch 6 83933 $588,537
% | G:inch 4 116475 $528,149
10C | Bench 1 18,389 $111,992
2k | 075-inch 1 155 $621
aR 1.25-inch 1 6 $2167
Total 0.625-inch 26,749 2,961,262 $16,094,183

Class Season
immer
Al s a me
Winter |

OEE eRe e Dele

@i0C
@1C
OR
@1RA
e2C
O2R
O2RA

Usage

63C 0%

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Percent of Revenue by Rate Class ID by Year
RateClassID
@10C
1c

OR

@1RA
1 ke
O2R
@2RA

Annual Total User Charges

2020

Rate Model includes:

¢ Inventory of current accounts by Rate class.
¢ Annual percent usage by Rate class.
¢ Annual percent revenue by Rate class.

¢ Projection of Expenses, including cash and
Capital Improvement Plan debt service.

¢ Breakdown of Operation and Maintenance
costs by expense category and distribution.

¢ Real-time rate change selection.

¢ Impact of rate change to fund balance over
time.

¢ Comparison of rate change impact to EPA
Affordability Index.

Conclusions

¢ Sewer rates need to cover the costs to finance the capital investments that are REQUIRED to
comply with regulatory permits and to avoid costly fines due to permit violations as a result
of failed infrastructure.

¢ Despite recently approved increases, Nashua’s sewer charges in 2023 will still be lower than
its peer utilities charge in 2021 and well below the 2021 NH State Average Household
Quarterly Bill.

¢ Nashua rates are and will remain affordable to all major household income brackets based
on EPA’s 2 percent affordability metric.

¢ Nashua has developed an Integrated Planning Framework to further reduce the rate impacts
of its required capital investments. This planning initiative will include all capital projects
linked to a Dynamic Sewer Rate Model to accurately forecast sewer rate increases well into
the future.

¢ No additional rate increases are proposed at this time. Rates will be reviewed annually to
determine if future adjustments are needed.

Hazen