Engineers Queensland Gladstone structural/Civil Engineering, Drafting and Town planning Wed, 13 Jan 2016 03:32:21 +0000 en-US hourly 1 Operational Works Mon, 27 Aug 2012 02:24:33 +0000 An Operational Works Approval requires numerous, time consuming steps to be taken, before an end result can be achieved. It requires input from a large array of organizations and people. To reduce the time it takes for the job to be completed, the input and required information should be provided to us before we start work.

Surveyor’s plans:

Surveyor’s plans are essential as they show relevant information required by council and other organizations. Organizing for electronic versions of surveyor’s plans to be provided to us can save time and money.

Council Information:

Council information is the most important information required. By providing us with the correct council information before we start work, assists us to produce plans to council’s specific guidelines for the job.

Other Information:

Other relevant information such as dial before you dig, which offers locations on existing services such as water, electricity, communications & gas is also appreciated.

Architectural Designs:

If there are plans that have been previously designed by an architect or builder for the site, please provide these plans in paper and electronic form before we start work. This can also save time and money.

Ergon Energy:

As the owner of the lot, you will be required to organize for a new power connection with Ergon Energy. This has to be completed before the Operational Works can be approved by council.


Pre-Start Meeting – The council requires a pre-start site meeting with the owner, builder, engineer and council operational works engineer. This is to be carried out on site.

Engineer Inspections:

Engineer inspections need to be organized with a registered engineer. The engineer will advise you as to what inspections are required on the different stages of completion.


Engineers Queensland Pty Ltd.




Septic (Waste Water)Designs Mon, 27 Aug 2012 01:21:56 +0000 Wastewater is any contaminated water discharged from a plumbed fixture from a dwelling, commercial premises, industrial site etc.

Wastewater is categorized into two distinct types:

  • Black water
  • Grey water

Black water is water that issues from lavatories. Kitchen wastewater is also potentially regarded as ‘black’ due to its high level of contaminants and is regarded as so by many local authorities. (Engineers Queensland treats kitchen wastewater as ‘black’ in all cases).

Grey water is water that issues from baths, showers, washbasins or laundries. Grey water irrigating is allowed within sewered areas. Laundry wastewater may be applied directly to ground. Read More

 Treatment Systems

There are two common levels of treatment:

1. Primary

Primary systems may treat the effluent either:

  • Anaerobically (without oxygen – e.g. septic tanks)
  • Via filtration (e.g. prior to grey water discharge whether pumped or not) with all discharge being piped below ground.

Note: Laundry water discharged directly to ground need not be treated. This method may be categorized into mainly two economical methods. The economy of each method over the other is dependent upon soil type (see below) and the size of the system:

All waste systems receive both black water and grey water components for anaerobic treatment in a septic tank prior to discharge.     

 Black water and grey water may be separated into two systems: (More economical in heavy (clayey) soils)

1. The black water (lavatory and kitchen waste) through a septic system.

2. The grey water via a filter and, either a pump out tank (short-term storage) or gravity fed to a garden bed(s)

Please Note: Storing of grey water for periods greater than 24 hours will render the water ‘black’ as this allows pathogens to proliferate and give rise to foul odors and, if irrigated may provide conditions conducive to the transmission of disease.

 2. Secondary

Secondary systems are proprietary systems that treat water to a much higher level than primary systems using aerobic and/or anaerobic or environmental methods, and allowing the discharge to be applied via sprinklers in heavy droplet form directly to the garden.

There are many and varied systems available on the market each requiring periodic servicing by the supplier/manufacturer. These systems all require connection to electrical supply.

 Percolation tests and Soil types

Percolation tests involve the drilling of boreholes at, or close to the placement of the ‘application area’ (see below). From these tests the permeability of the soil will be ascertained and a soil category given.

Soil categories range from the most permeable 1, through to the least permeable 6. Category 1

being gravels and sands, 2 – 4 sandy loams to clay loams and categories 5 & 6 light and

medium/heavy clays.

 Application Area(s)

The application area is the parcel of land to which the effluent will be ultimately discharged. This may be as a bed with a calculated surface area and depth, or as a trench with width, depth and length assigned.

The sizes of these areas are determined by the soil type, region (rainfall, evaporation etc) and the numbers of persons normally in residence, which in turn, is dictated to by the total number of bedrooms within the building.

It is important for the householder to note that fully enclosed rooms such as studies, media rooms, computer rooms etc. may be regarded as potential bedrooms.

 Designer’s Role

The designer’s role is to calculate the size of the area required and the means of application to the ground, whether sub-surface or aboveground.

The factors that determine the size of the system are the number of inhabitants/users, use of the building (domestic, commercial or industrial), the class of soil and the meteorological effects of the area (i.e. rainfall, evaporation etc.) and the type of system chosen (primary or secondary).


For more information or making free consultation appointment please Contact us.


Soil Testing, Classification , Reporting & Percolation Testing Mon, 27 Aug 2012 01:07:13 +0000 Soil Testing (Site Classification) For Footing and/or Slab Construction

Soil Tests (site classification) for residential dwellings, industrial, and commercial buildings, are required to assess the subsurface conditions and therefore enable the design of appropriate footings and slabs. A soil test is generally required as part of a building application.  

The site is classified based upon the expected movement of the foundation soils – generally related to the capacity of the soil to shrink and swell.

The following classifications are typically given (as per Australian Standard AS2870)

•  CLASS ‘A’ – Little or no ground movement

•  CLASS ‘S’ – Slightly reactive site

•  CLASS ‘M’ – Moderately reactive site

•  CLASS ‘H1’ – Highly reactive site

•  CLASS ‘H2’ – Extremely reactive site

•  CLASS ‘E’ – Problem site

The site classification is presented by Engineers Queensland in a formal report which forms part of the building application. A discount applies if the soil test is combined with a footing design.

 Percolation Testing 

The percolation test is used to determine the suitability of a site for a subsurface wastewater disposal system (i.e. septic system or mini-treatment plant). More specifically, a percolation test measures the ability of the soil to transmit liquid. Wastewater system designers use the results of percolation tests to properly design disposal areas.

The design of the system is based on the measured percolation rate and the number of bedrooms in the home.

The greater the number of bedrooms and the slower the percolation rate, the larger the system which is required. A discount applies if the percolation test is combined with a wastewater design.

For more information or making free consultation appointment please Contact us.

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