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Description: Inside Drop Shaft Zero
Inside Drop Shaft Zero
Periodic inspections of large diameter conveyances are an important aspect of properly maintaining vital and expensive infrastructure. Besides ensuring the structural integrity and hydraulic capability of the conveyance, some have devices installed within them that require their own maintenance. Performing this work with a common manhole entry in a residential neighborhood with typical traffic control might require a three-person crew, and it might occur at several locations in a single workday. That is ordinary. ... This is Drop Shaft Zero (DSZ), and inspecting it is extraordinary.
Author(s)
Richard R. Roll
SourceWater Environment & Technolology
Subjectinfrastructure renewal; inspections; CSOs
Document typeMagazine article
PublisherWater Environment Federation
Print publication date Feb 2020
Volume / Issue32 / 2
Content sourceWorld Water Magazine
First / last page(s)20 - 27
Copyright2020
Word count2,967
Subject keywordsNiagara Fallsinternational borderhistorymaintenance planninglarge diameter conveyanceFalls Street Tunnel

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Description: Inside Drop Shaft Zero
Planning and Entering
Inside Drop Shaft Zero
Planning for a complicated entry can include several aids, including checklists, documentation from previous work, advice from former entrants, etc. The wisdom from these sources and more can be consolidated into a single resource, a Job Safety and Environmental Analysis (JSEA). Developing a JSEA forces one to think through every aspect of the work at hand. Each task is identified, along with the...
PublisherWater Environment Federation
Copyright2020
Word count272
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Description: Inside Drop Shaft Zero
Special Considerations for DSZ
Inside Drop Shaft Zero
JSEAs are commonly used for confined space entries and other hazardous work. But DSZ is not common and includes some unique constraints, such as working within the secure border crossing area. Utility workers and contractors cannot enter and leave the security area at-will, for example. Additionally, communication and coordination with representatives from the U.S. Customs and Border Protection...
PublisherWater Environment Federation
Copyright2020
Word count182
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Description: Inside Drop Shaft Zero
Following Procedures
Inside Drop Shaft Zero
Inspection day begins early for the entry coordinator. They check the weather, treatment facility status, and last-minute messages from the stakeholders that might call off work for that day. The coordinator might choose to employ their Stop Work Authority, halting activities for an impromptu safety stand-down and evaluation. For example, if rain has made the tunnel unsafe to enter, the...
PublisherWater Environment Federation
Copyright2020
Word count1,653
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Description: Inside Drop Shaft Zero
Reporting
Inside Drop Shaft Zero
No job is finished until the paperwork is complete. When all entrants are out and the opening cover is secured, the site supervisor closes out the confined space entry permit. The day’s activities and findings are summarized in a report, including photographs and sketches made to document the work. The report, also documenting the actual duration of groundwater discharge to the river, is...
PublisherWater Environment Federation
Copyright2020
Word count662
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Inside Drop Shaft Zero