Underground Construction - August 2021 - 37
EDITION 67 | AUGUST 2021 | NASSCO.ORG
Standard methods that are typically employed
for styrene management should include:
Sites that directly interface with surficial
drainage courses should be assumed to be
an active fish habitat. Therefore, acceptable
styrene discharge levels should be matched to
the environment based on appropriate detailed
studies of the receiving environment or measurable
levels of discharge should not be permitted
in the absence of such studies.
Styrene management plans need to be
developed, more typically focused on free
styrene pathways. Alternatives methods of
control may include:
* Use of styrene-free resins.
* Use of on-site treatment systems where hot
water curing methods are used. Properly
designed mobile treatment systems are now
readily available to reduce discharge limits to
very low levels if required.
* 100% condensate capture, removal of any
residual free styrene and off-site disposal at
a legal discharge facility where steam curing
methods are utilized.
* Confirmation that no residual free styrene
is present that could be discharged to the
environment where UV curing methods are
used.
* Special tube selection to mitigate the ability
of free styrene to be discharged to the
environment.
When the workplace moves away from pure sanitary sewers and outside of the normal urban setting,
styrene management for CIPP projects needs to be elevated while still adhering to traditional styrene
emission standards. Fortunately, there are numerous tools, techniques, and product variations that can
be used to appropriately match our work to the specific work environment. We just need to do it!
Styrene management plans need to include
sufficient details on:
.* Required limits to be regulatory compliant
for discharge based on the proposed resin
selection, curing method, and discharge
location for steam condensate or cure water,
storm water, etc.
* The means, methods, and techniques
employed to mitigate styrene levels to
within acceptable limits for discharge to the
environment, including:
- Resin selection to eliminate or mitigate
styrene levels.
- Cure considerations to mitigate excessive
styrene volatilization.
- Handling considerations post cure to
mitigate levels discharged to aquatic
or other environments that may be
deleteriously impacted by excessive styrene
levels.
- Monitoring to be employed to confirm
discharge levels are consistent with
the styrene management plans stated
discharge limit objectives.
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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
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Underground Construction - August 2021 - 24
Underground Construction - August 2021 - 25
Underground Construction - August 2021 - 26
Underground Construction - August 2021 - 27
Underground Construction - August 2021 - 28
Underground Construction - August 2021 - 29
Underground Construction - August 2021 - 30
Underground Construction - August 2021 - 31
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Underground Construction - August 2021 - 33
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Underground Construction - August 2021 - 35
Underground Construction - August 2021 - 36
Underground Construction - August 2021 - 37
Underground Construction - August 2021 - 38
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Underground Construction - August 2021 - 40
Underground Construction - August 2021 - 41
Underground Construction - August 2021 - 42
Underground Construction - August 2021 - 43
Underground Construction - August 2021 - 44
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Underground Construction - August 2021 - 50
Underground Construction - August 2021 - Cover3
Underground Construction - August 2021 - Cover4
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