Shutdowns at Wurdee Buloc a Success

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the bulletin ENTRACON QUARTERLY UPDATE AUTUMN 2008

Entracon

20 Boundary Road Narre Warren East VICTORIA 3804 Ph: 03 9796 9711 Fax: 03 9796 9722 Email: [email protected]

In this issue… Completed Projects Sunday Creek Reservoir Spillway Upgrade Olangolah Reservoir Embankment and Spillway Upgrade Design, Supply and Installation of Gross Pollutant Trap, Balaclava. Barlings Beach Culvert Crossing Holmesglen Valley Stormwater Biofilter (Wetland) Current Projects Wurdee Buloc Water Filtration Plant Upgrade

Shutdowns at Wurdee Buloc a Success

W u r d e e B u l o c W a t e r Treatment Plant was shutdown for approximately 36 hours in April as part of the recent upgrade. It was the second of four shutdowns that are necessary to complete the modifications to the existing filter pipework and backwash pumpstation construction. In February, the first shutdown allowed the main pipeline to be cut. During the second, and most recent shutdown, the existing pipe and concrete pipe supports

were removed and the new section of 1750mm diameter pipe was positioned and welded into place. Barwon Water allocated 48 hours for this shutdown, temporarily stopping the water supply from Wurdee Buloc to Geelong for the pipeline works to be completed. The works was carried out through the day and night, and successfully completed within the allocated shutdown period. More information on Wurdee Buloc upgrade inside...

Issue 1, Volume 7

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2008 Completed projects

Sunday Creek Reservoir Spillway Upgrade, VIC.

Client:

Goulburn Valley Water

Representatives: Peter Hull Lachlan McGregor Project Design: SKM Consulting Project Manager: Craig Johnson Contract Sum : $ 3.7 M

Works Included • Spillway upgrade. • Structural concrete works associated with raising the spillway

wall ≈ 1200m3. • Construction of a weighting berm on the downstream face. • Construction of a filter drainage system on the downstream face

and toe of the existing embankment. • Modifications to the existing outlet pipe, valve and pits. • Excavation of 30000m3 of graded material from onsite borrow pit

for weighting berm. • Aquaseeding of embankments.

Site Issues • Inclement weather. • Limited space for stockpiling of material. • Steep batter slopes, limiting access. • Theft and vandalism.

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2008 Completed projects

Client:

Barwon Water Project Manager: Murray Davidson Project Design: SKM Consulting Craig Johnson Contract Sum : $ 0.8 M

Olangolah Reservoir Embankment and Spillway Upgrade, Forrest, VIC.

Works Included

• Clearing silt from bottom of dam. • Rock beaching dam wall. • Dam wall upgrade with

filter systems. • Substantial wall

strengthening. • Spillway upgrades. • Extensive concrete works.

Site Issues

• Extreme weather conditions.

• Remote location. • Site access.

Progress on the Olangolah Project was made difficult due to excessive rain in Forrest over the past months. In order to ful f i l the Pract ical Completion requirements, machinery was brought in from Queensland and work was continued during these adverse conditions. Practical Completion was achieved within the allotted time frame.

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2008 Completed projects

Design, Supply and Installation of Gross Pollutant Trap, Corner Chapel and Edwards Streets, Balaclava, VIC.

Client:

City of Port Phillip Client Representative/ Project Manager: Mihai Florea Project Design:

Rocla CDS in conjunction with Entracon

Contract Sum : $ 0.2 M

Works Included • Removal of a section of pavement. • Cutting into the existing stormwater system. • Installation and connection of a gross pollutant trap, consisting of a CDS unit and diversion chamber.

Site Issues

• Restricted working area due to tram tracks, power lines, road, buildings and gas main.

• Project completed over 36 hours working continuously through the day and night.

• Lifting of the sealed road surface was made difficult due to a concrete slab under the pavement.

• The stormwater drain was not in the position plans had suggested and this was not discovered until concrete slab was lifted.

• Compulsory completion of Yarra Trams ‘Tram Overhead Appreciation’ by all employees.

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2008 Completed projects

Barlings Beach Culvert Crossing, NSW.

Client: Akron Roads

Project Manager: Marc Kraven Project Design: Coomes Consulting Contract Sum : $ 0.3M

Works Included • Construction of culvert crossing. • Installation of guard railing. • Board piers. Site Issues • Sandy foundations. • Aboriginal monitoring. • Exclusion zones. • Working within a flood channel.

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2008 Completed projects

Holmesglen Valley Stormwater Biofilter (Wetland), Ashwood, VIC.

Client: City of Monash Client Representatives: Robyn Mitchell Patrick Mallon Project Design: Parsons Brinckerhoff Project Manager: Peter Meyers

Contract Sum : $0.3M

Works Included

• Wetland construction. • Excavation and removal of

excess material. • Construction of clay liner. • Preparation of planting beds

and drainage. • Construction of rain garden. • Rockwork.

Site Issues

• Removal of soil offsite. • Protection of surrounding

trees.

A rain garden, or bioretention system, is a soil based system that treats stormwater runoff via filtration through a soil medium. The hydraulic and horticultural properties of the soil must be considered for the rain garden to be successful. Plants in the rain garden also increase the uptake of pollutants.

Rain gardens typically consist of the following layers; Mulch - retains moisture within the underlying filter media and suppresses weeds. Filter - layer of soil acts as pollutant filter and supports plant growth. Transition Layer - sand layer separating filter and drainage layers . Drainage Layer - free draining layer containing perforated drainage pipe.

Mulch layer

Drainage Layer

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2008 Current projects

Wurdee Buloc Water Filtration Plant Upgrade, VIC.

Client: Barwon Water Superintendent: Ben Carter Project Design: Kellogg, Brown & Root P/L

Contract Sum : $ 5.3 M

Works Included • Construction of a complete backwash pumpstation. • Installation of 900 and 1750mm diameter MSCL pipe. • Critical shutdowns of the water treatment plant. • Associated civil works.

Site Issues

• A small crane was utilised to remedy the limited access to filter areas for installation of pipework.

• Works to be completed within the shutdown time frame. • Unforeseen difficulties in removal of existing pipe and concrete

pipe supports as the pipe was anchored to the concrete supports.

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2008 Other News

Training Weekend In Lorne

All Entracon employees attended a training course weekend in February at Mantra Resort in Lorne, Victoria. The aim of the weekend was to emphasise the importance of teamwork within the company environment. Team building and problem solving activities have enhanced the values of our employees as a group. Sporting and recreational activities offered at the resort were popular across the weekend. Fun was had by all.

Occupational Health and Safety Training, Courses and Safety C2 Crane Driver’s Ticket recently completed by Sam Spicer and Scott Slade. All employees working on the GPT installation project at Chapel Street completed a Yarra Trams ‘Tram Overhead Appreciation’ course. All employees have completed Red Card Training. On site plant and equipment competency assessment program for all employees continues. In the future…….

All employees will attend an Occupational Health and Safety Training Day in June. Hearing tests have been booked for all employees. Chris Micallef to attend 5 day Occupational Health and Safety Course. Rod Allen to attend an Internal Auditing Course to further Entracon’s environmental knowledge and help to achieve environmental goals.

Entracon was once again successful in achieving certification in Occupational Health and Safety, Environment and Quality Assurance after an external audit review in April.

Mighty Crane –

3 tonne trackable

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2008 Other News

New to our Fleet

New Staff Welcome to Darren Lee. Darren has recently joined Entracon as a Project Manager.

Caterpillar D6R LGP Bulldozer

WE ARE MOVING

Entracon will be relocating its office and yard in the near future.

Our new address is

51 Melverton Drive, Hallam VIC 3803

More information regarding our new premises in the next bulletin.