Underground Construction - August 2021 - 36

PART 2
This is the second in a series of articles by NASSCO's Technical
Advisory Council (TAC) discussing the health and safety aspects
of styrene in cured-in-place pipe (CIPP) method renewal.
WORKING WITH CIPP IN
ENVIRONMENTALLY SENSITIVE AREAS
By NASSCO Technical Advisory Council Member
Christopher Macey, P.Eng.
This is the second in a series of articles by NASSCO's
Technical Advisory Council (TAC) discussing
the health and safety aspects of styrene in curedin-place
pipe (CIPP) method renewal. While the
initial article reviewed the history of styrene use and
focused on styrene emissions, this article focuses
on project planning and execution to mitigate potential
deleterious impacts to the environment when
conducting CIPP work in and around environmentally
sensitive areas.
As noted in the first article in this series, the CIPP
industry looks forward to the next 50 years of
buying an even longer life cycle for our aging infrastructure.
To facilitate this requires not only a better
understanding of styrene emissions but a more
holistic understanding of management of styrene
and all substances we work with, such that the implementation
of rehabilitation works neither harms
humans nor the environment around us. NASSCO
is committed to providing sensible best practices
that promote sound environmental stewardship
while funding research to evaluate the challenge
of building the next generation of infrastructure by
integrating science with continuous improvement
processes matched appropriately to the complex
problems we are trying to solve.
Environmentally sensitive areas can cover a broad
spectrum of habitats. One of the most common
areas we face, however, is in works where CIPP
residual products could potentially come in contact
with water courses or any other water habitats
bearing fish or other sensitive species. While
the management of styrene emissions is usually
focused on odor management and worker safety in
areas that need to work in close proximity to residual
styrene pathways in air, styrene management in
environmentally sensitive areas needs to focus on
potential free styrene pathways that may enter the
environment directly or by simple rainfall runoff processes.
While each environmentally sensitive area
is unique and has thresholds that will vary based
on the species of concern and the assimilative
capacity of the waterway or water body, suffice it to
say, fish habitat typically have considerably lower
thresholds for potential harmful effects from work in
close proximity than typical human exposure limits.
When the exposure risks are greater, we need to
elevate our approach to appropriately match the
environment.
In CIPP work in typical urban settings on sewers
conveying sanitary sewage, the risks are readily
manageable and project planning is usually limited
to a balance of housekeeping issues and other
techniques focused on airborne styrene emissions
such as those that evolved out of 2020 studies
from Trenchless Technology Center's (TTC) " CIPP
Emissions Phase 2: Evaluation of Air Emissions
from Polyester Resin CIPP with Steam Cure " . When
the pipes being rehabilitated, however, shift from
sanitary to storm sewers or the surrounding work
area changes from the urban setting to wetlands
or nature rich environment with diverse species
present beyond humans, our planning and management
of construction needs to change and be
appropriately matched to the workplace environment.
Matching
the technique to the problem is not a
" one-size fits all " , it requires planning, careful delivery
and project execution and monitoring to verify
that mitigative efforts have been successful.

Underground Construction - August 2021

Table of Contents for the Digital Edition of Underground Construction - August 2021

Contents
Underground Construction - August 2021 - Cover1
Underground Construction - August 2021 - Cover2
Underground Construction - August 2021 - Contents
Underground Construction - August 2021 - 4
Underground Construction - August 2021 - 5
Underground Construction - August 2021 - 6
Underground Construction - August 2021 - 7
Underground Construction - August 2021 - 8
Underground Construction - August 2021 - 9
Underground Construction - August 2021 - 10
Underground Construction - August 2021 - 11
Underground Construction - August 2021 - 12
Underground Construction - August 2021 - 13
Underground Construction - August 2021 - 14
Underground Construction - August 2021 - 15
Underground Construction - August 2021 - 16
Underground Construction - August 2021 - 17
Underground Construction - August 2021 - 18
Underground Construction - August 2021 - 19
Underground Construction - August 2021 - 20
Underground Construction - August 2021 - 21
Underground Construction - August 2021 - 22
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Underground Construction - August 2021 - 28
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