The Erosion And Sediment Control Construction Essay

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The purpose of this report is to outline the site layout for the new access road to a new subdivision. This access road connects to an existing section on state highway one which at present has a speed limit of 100 kilometres per hour. Numerous issues with the site include this highway, the existing stream and wetlands to the south of the proposed road layout. This report will address any issues with the site and suggest the best choice of action to minimise any risks involved with this project.

The area where works are being undertaken are relatively far away from the public (nearest house is 500m away) so noise control should not be an issue on this site. However, a notification flyer describing the works should be given to surrounding houses to inform them of the works and of possible noise from construction of the road. It should also be noted that any loud machinery should not be used before 9am or after 6pm to avoid any noise complaints. As this site is not within a city or town, all site facilities will have to be considered. The positioning of the site office, toilet, lunchroom and tools/equipment storage (if required) will all have to be set out in an easily accessible area away from any works taking place. The map shows a small road slightly north along the highway that can be used to create a temporary access road to the top of the site. The top of the site will also be the best position to place these facilities as the access road can act as an entry point to visitors, meaning vehicles can be parked well away from the main highway to avoid any collisions but also means that the point where the new road meets the existing highway can be barricaded/fenced off to eliminate any public mistakenly entering the site. The access road will also remove any risk of workers’ or construction vehicles ruining the subgrade soils by driving on it. With positioning the site office at the top of the site it will provide a good field of view for both the project manager and his assistant when they are not walking around the site. The highway poses a great safety hazard for workers entering and exiting the site as well as those who are working on the new road where it joins to the highway. A TMP (Traffic Management Plan) will have to be devised notifying any traffic of the works being carried out on the side of the road and of trucks/vehicles entering and exiting the site. A clear sight distance of 100m for the signs and 150m for a warning sign will have to be attained as well as a minimum spacing of 75m between two signs. To assist with vehicles entering and leaving the site a temporary speed limit of no higher than 80 Km/h should be implemented. This will also help in making the Public more aware of any hazards as they pass the site and provide shorter stopping distances for motorists should they require it. The final set of signage will be site access signs at the access road to indicate to contractors, the client and any other visitors where to gain access to the site.

Erosion and Sediment Control

Due to the existing wetland and stream adjacent to the site (which are both highly valued ecosystems), erosion and sediment control is a necessity. Initially a clean water channel should be established just north of the road to catch and redirect clean water away from the excavation works. To remove it off site a lined channel will have to be constructed across the start of the road to be constructed to allow the clean water to discharge into the stream. Next a silt fence should be erected along the length of the stream to intercept any silt runoff before it reaches the stream. These two features will have to be set up before any earthworks whatsoever take place. As there will be earthworks taking place and the ground slopes towards the stream and wetland a detention pond should be put in place. This should be in a low lying area with access to the stream for the discharge of water. The next task will be to remove the topsoil and create a bund the length of the wetland, and stopping at the detention pond. A second bund should be created extending from the area where the gabian wall will be erected and travel back to the detention pond. These two bunds will create a set of channels to carry silt runoff from the site into the detention pond where it can be detained long enough for the silt to fall to the bottom and clean water to exit into the stream. The gabian wall should be erected as soon as earthworks in the area have been completed to provide extra filtration for the silty runoff heading towards the stream.

Earthworks

The first task with earthworks will be to strip the topsoil and store it on site for later use in reinstating the topsoil and vegetation. As mentioned earlier the best option for storage of the top soil will be to construct a bund to collect and discharge water into the silt detention pond. This will reduce the need for digging a channel and provide safe storage out of the way of works taking place. As this operation for earthworks is a cut to fill with excess material left over a site to dump the material must be found. There is a site nearby where any excess material can be disposed of at. However, it would be most economical to store the excess material somewhere on site until the subgrade levels are finished and the sub base or basecourse materials are being laid out. This will provide extra material if needed in case more fill material is required to get subgrade soil levels to their required heights. Once this has been achieved then the remaining material can be loaded into trucks to be disposed of at the aforementioned disposal site.

Health and Safety

As there is machinery, including rollers, excavators and trucks on site it is important that those working on the site are well trained to either operate or work around machinery. Those working around the machinery need to make themselves visible to the driver at all times by positioning themselves in the drivers’ field of vision and by wearing high visibility clothing such as vests. Drivers and operators of machinery need to be adequately trained to operate the vehicle they are using and to be aware of their surroundings. Another issue to be aware of is trench collapse. Trenchworks will be required to lay both subsoil and storm water drainage and so all workers need to be aware of where trenching is occurring. Also if trenches are over 1.5m deep a form of bracing of the trench walls must be used for trenches where a worker must be inside the trench. Also if possible workers can complete works from outside the trench. A soil slip must be considered as cuttings are present and incorrect batter slopes or excessive rainfall could result in a slip. Monitoring of the exposed soil will be the best method of minimising this risk as well as only removing the vegetation that will be in the way of works if it is left there. Any works near the highway will carry a risk of workers struck by motorists and electrocution by power lines running along the highway. Any workers near this area should be properly trained to be aware of these risks

Hazard

Risk

Location

E / I / M

How?

Plant run over

Moderate - High

Minimise

Training,

Isolate

Separate workers from plant

Trench collapse

Moderate

Eliminate

No workers in trenches, trench boxes

noise

Low - Moderate

machinery

Minimise

Wear ear protection around plant

dust

Low - Moderate

machinery

Minimise

Wear dust masks

Soil slip

Moderate

Batter slopes

Minimise

Monitor slopes, be aware of excessive rainfall in the area

Struck by Traffic

low

Along highway

Minimise

Traffic control, training

Electrocution

Low-moderate

Power lines along highway

Minimise

Proper training for workers and vehicles

Isolate

No machinery/ workers near power lines (if possible)

Conclusion

By implementing these methods contained within this report there should be minimal risk of public complaints, pollution into the stream or wetlands, worker injury and injury to the public and/or workers. Setting out site offices and other facilities at the entrance to the actual site will be relatively efficient as workers can obtain their tools and equipment or receive any updates or information regarding the days work when they enter the site and will provide the best view of the whole site for the project manager and his assistant. By blocking off the site at the area where the new road connects with the existing highway there will be minimal risk of the public entering the site and minimal damage caused to the subgrade soils during earthworks from vehicles driving on it.

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