Dormer Construction

Canterbury Plains Water Submission

September, 2015

Canterbury Plains Water SubmissionDormer Construction Limited (DCL) is a drainage civil engineering company specialising in the construction of earth works, pipelines and other civil works. They specialize in difficult construction tasks, especially deep, wet and challenging pipelines.

The company was founded by Peter E. Dormer sole owner and director of the company, in 1994 when he left school at the age of 17. From a one man business the company has grown not only in size but in the regard of its peers and the public.

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Pukaki Water Scheme EOI

September, 2015

Pukaki Water Scheme EOIWith a strong focus on our clients’ needs we are committed to providing the quality products and services demanded in technical civil project delivery. We have developed systems, programmes and practices to reduce risk to the organisation and conduct business activities in an effective manner. We are committed to continuous improvement of our services through training, innovation, feedback, and lesson learnt.

Managing key project issues is fundamental to the services and project management that Dormer Construction provides to its clients. Knowledge, technical skills and experience form the basis of mitigation strategies and the subsequent lessons learned that can be applied to new projects. Dormer Construction is extremely confident that it has both the equipment and the skills to successfully undertake the scope of works on the PIC Irrigation Scheme.

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Mt Beautiful Wine Earth Dams

August, 2014


Making use of a natural valley watercourse, and storm water capture, Mt Beautiful resolved to create two low-height, low-capacity earth dams to service irrigation needs across significant areas of vineyards and grape varieties. Dormer assisted the site developer with design input for the concrete spillway and embankment proposals.  The large spillway was formed to take a base flow along with capacity to convey a 1% AEP*. This spillway was partially lined with concrete (to convey a 5% AEP) with erosion matting outside of this area for the larger flows. Topsoil was stockpiled and placed over the dam embankment upon completion and used to ease contours.  This agricultural  bulk earthworks scope included; stripping of site topsoil from cut and fill areas, excavation of cut material and cart to fill areas, proof rolling base and undercutting weak material, compaction of earth-fill, placement of topsoil, placement of wave armouring and grading.  Old watercourses within the valley floor were dug out to clean material.  The borrow for the fill was from a gravel colluvium bank adjacent the dam site. The bank was cut back vertically (as had been in the past). During the construction a siltstone was uncovered and this was used for the core of the dams as the permeability of this material was low.  Two dams were formed by Dormer. Dam 1  being 145m long 4.5m high 30m wide consisted of 14000m3 of earth moved during the preparation and building of the dam. Dam 2 112m long x 3.5m high x 24m wide consisted of 15000m3 of earth moved during the preparation and building of the dam.



Works were carried out in accordance with the requirements of NZS4431 and NZS4402. Achieved compliance with ECcan requirements.  Silt and sediment controls installed.

Health and Safety

No accidents during this contract.


Works were subject to rigorous field tests (maximum dry density) and site quality inspections recorded by Dormers engaged Engineer.  Achieved 8 week physical works construction programme.


Negotiated contract.  Maintained Cost Plan.