Kia ora Markus

 

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-----Original Message-----
From: Markus Alexander <[FOI #31548 email]>
Sent: Friday, 11 July 2025 8:07 am
To: Official Correspondence <[email address]>
Subject: Official Information request - Lyttelton Tunnel

 

[You don't often get email from
[4][FOI #31548 email]. Learn why this is
important at [5]https://aka.ms/LearnAboutSenderIdentific... ]

 

Dear New Zealand Transport Agency,

 

It is my understanding that the Lyttelton Tunnel has a transverse
ventilation system supplying fresh air into the tunnel at regular
intervals along the tunnel. In a previous request from 2018 it was stated
the air quality including carbon dioxide, nitrogen oxide, air flow and
visibility was monitored.

 

How are these gases and the air flow monitored? What equipment is used?

 

How many primary and backup systems are in place to ensure these levels
are accurately monitored?

 

What are the acceptable levels for each gas and acceptable air flow within
the Lyttelton Tunnel?

 

What is the procedure for when the fresh air ventilation fan is shut down
for routine maintenance and tunnel cleaning?

 

What is the maximum time the ventilation fan can be shut down for while
still allowing cars or workers in the tunnel?

 

Yours faithfully,

 

Markus A

 

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