Case Study: CCC Wellhead Upgrade Pre-Condition Surveys

July 7, 2021

Prendos was engaged to complete pre-development condition surveys on behalf of Seipp Construction for Christchurch Council’s wellhead improvements project.


Client Name: Seipp Construction
Location: Christchurch
Services: Pre-Development Condition Surveys
Prendos Contact: Andrew Maxon, Senior Building Surveyor – [email protected]


The Job

Prendos was engaged to complete pre-development condition surveys on behalf of Seipp Construction for Christchurch Council’s wellhead improvements project – the upgrade of wellheads across Christchurch City to reduce risk of contamination from floodwater to 27 drinking-water wells, identified as being at risk. To achieve this, well casings at each well had to be extended above ground and over-drilled to depths ranging from 6m to 20m, depending on the depth of the confining layer. This was followed by the filling of annuluses with a stabilised bentonite grout mix; and valve assembly arranged horizontally over a concrete plinth.

The contract required the surveys to establish the extent of existing damage to properties adjacent to the proposed drilling sites prior to the works commencing.

Our Solution

We carried out pre-development condition surveys of all relevant properties, consisting of more than 200 primarily residential properties (apartments and detached houses), as well as some commercial buildings.

Close liaison with property owners was required to obtain access at mutually convenient times. Our objective was to cause minimal disruption during the survey and remain mindful of each resident’s specific situation: young children, disabilities, mental issues or time off work. We also had to deal with onsite issues such as dogs and access difficulties due to poorly maintained properties. As no contact details were available for most residents, access had to be arranged at mutually convenient times by pre-notification letters and door-knocking.

The Outcome

Through clear, open and respectful communication with all property owners and tenants, Prendos surveyors were able to compile the large number of condition surveys within the required timeframe. By using three in-house surveyors, we also ensured that uniformity was maintained across all reports. This allowed Seipp Construction to get on with the work of upgrading the wellheads with minimal issues; careful co-ordination and quick mobilisation of our survey teams on site allowed programmed works to be completed on time, despite very tight timeframes and short lead-in times.


Andrew Maxon - Senior Building Surveyor
Andrew Maxon, Senior Building Surveyor[email protected]prendos.co.nz | 03 940 2764 | 022 327 6478

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