Foreword by Ken Livingstone, Mayor of London




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НазваниеForeword by Ken Livingstone, Mayor of London
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The content of a Method Statement will be determined by the site evaluation (see Section 4.1) but typical features to include are
outlined below.

For all sites:

• summary of work to be carried out

• description of site layout and access – including proposed haul routes, location of site equipment including supply of water for damping down, source of water (wherever possible from dewatering or extraction), drainage and enclosed areas

• inventory and timetable of all dust generating activities

• list of all dust and emission control methods to be used

• details of any fuel stored on site

• identification of an authorised responsible person on-site for air quality. Ideally this person needs to have knowledge of pollution control and vehicle emissions;

• summary of monitoring protocols and agreed procedure of notification to the local authority nominated person(s)

• a site log book to record details and action taken in response to exceptional incidents or dust-causing episodes. It should also be used to record the results of routine site inspections.

Additional information for high risk sites

An approved list of all non-road mobile machinery (NRMM) to be used on site and appropriate after-treatment technology is available on the Energy Saving Trust website. See www.est.org.uk for details.

Details of the contractor’s workforce training in areas such as health and safety, best practice methods, site housekeeping, reporting procedures and communication must be made available. All staff should have some training of on site pollution policy, perhaps as part of site induction training.


The specific site issues

A LPA may also make management of the following issues a condition of a method statement.

Asbestos

For sites with potentially asbestos-containing materials, a separate method statement will need to be produced by a specialist asbestos treatment contractor. An independent professional should approve the statement to ensure that no person at work or member of public is exposed to a harmful release of asbestos during works. Further information on asbestos control is provided in Section 6.13 and the relevant regulations are outlined in Appendix 3.

Demolition

• developers must notify the Building Control Team of the relevant local authority of any building demolition works under sections 80 and 81 of the Building Act 1984. Demolition may commence after six weeks has elapsed from the submission of the notification or after the local authority has issued a counter notice, which will require certain tasks to be carried out

• developers should consider referring to the demolition protocol set up by the ICE (Institution of Civil Engineers) and CIWM (Institute of Waste Management)14. This protocol provides best practice on aspects such as building audits and use of recycled materials to be reused on site or elsewhere.


Contaminated Land

Many construction sites in London take place on brownfield sites and it may be appropriate to consider the following:

• inclusion of contaminated land issues in the method statement, in
the context of identifying potential emissions to air and protecting human health

• providing details of specific control measures for sites with potential contaminated land issues

• developers should refer to legislation and procedures such as EPA 1990, Building Regulations Approved Document C, PPS23 and CLR11 for more information.


6 Dust and emissions control measures

Developers will need to ensure that all on-site contractors follow best practicable means (BPM) at all time to minimise dust and emissions. The following sub-sections identify the activities that are most likely to produce dust and outlines BPM. Some of these measures are summarised in the flow diagrams in Section 4 and they are divided up according to the site risk. These measures are intended to be stringent but achievable and in-line with BPM to deal with the specific pollution problems facing London. All appropriate measures should be included in the method statement (Section 5).

6.1 Pre-site preparation

For all sites with areas of open ground that are close to sensitive receptors, developers should follow best practice to prevent dust and other pollutant emissions from being carried outside the boundary.

 Low Risk

• Machinery, fuel and chemical storage and dust generating activities should not be located close to boundaries and sensitive receptors if at all possible.

• Erect effective barriers around dusty activities or the site boundary.


 Medium Risk and High Risk

• As for low risk sites.

• Erect solid barriers to site boundary.


6.2 Haul routes

6.2.1 Surface of roads

Unpaved haul routes can account for a significant proportion of fugitive dust emissions, especially in dry or windy conditions, when the generation of dust through the movement of vehicles is exacerbated. It is recommended that to comply with good practice, developers should ensure that hard surfaces or paving are used for all haul routes, even if routes are temporary.

 Low Risk

• Use consolidated surfaces on roads near to residential areas.


 Medium Risk

• As for low risk sites

• Hard surface all major haul routes through the site (e.g. use recycled rubber blocks, concrete blocks or tarmac).

• Regularly inspect haul routes for integrity and repair if required.

• When the haul route changes, re-use surface where possible.


 High Risk

• As for medium risk sites. In addition, lay roads to a camber to
prevent puddles.


6.2.2 Damping down

Developers will need to wash or damp down haul routes both within and outside the site. This is particularly important for sites close to residential properties or other sensitive receptors. Developers should consider the environmental and economic benefits from the use of groundwater sources on site, as opposed to bringing drinking water onto site for the purpose of dust suppression. Where possible the source of water should be sustainable to maximise use and re-use of this resource. For example, water produced from dewatering can be used on site, as achieved as part of the Channel Tunnel Rail Link (CTRL) contract. The majority of water that is generated from dewatering is discharged into watercourses or soakaways. Under the Water Act 2003, dewatering processes now require an Abstraction Licence to ensure appropriate environmental management15.

In addition, the use of flocculants or binders may be warranted in certain circumstances to reduce the volume of water needing to be used.

 Low Risk

• Use agreed wet cleaning methods or mechanical road sweepers on all roads during periods of dry weather.

• Clean road edges and pavements using agreed wet cleaning methods.


 Medium Risk

• As for low risk sites.

• Use agreed wet cleaning methods or mechanical road sweepers on
all roads at least once a day or consider using fixed or mobile
sprinkler systems.

• Provide hardstanding areas for vehicles and regularly inspect and clean these areas.


 High Risk

• As for medium risk sites.

• Use fixed or mobile sprinkler systems to clean roads at least once a day.

• Where possible use sustainable sources of water, such as from dewatering or extraction.

• Contact the Environment Agency to recycle any collected material or run-off water - according to legal requirements.

• Provide hardstanding areas for vehicles and regularly inspect and clean these areas.


Consider requiring contractors to meet ENCAMS standard for detritus grading (e.g., Grade B)16 - this means that dust or debris deposited on public highways has to be removed.

6.2.3 Vehicles

All developers should carry out the following controls to reduce dust and particulates associated with vehicles - such as that from exhaust emissions, the contact of tyres on the road surface or dust blowing from materials carried,:

 Low Risk

• All vehicles should switch off engines - no idling.

• Clean or wash all vehicles effectively before they leave a site if there is a risk of affecting nearby sensitive receptors.

• All loads entering and leaving site to be covered.


 Medium Risk

• As for low risk sites.

• Wheel wash vehicles before they leave a site.

• Hard surface haul routes and clean them effectively17.

• Impose an appropriate speed limit around site.


 High Risk

• As for low and medium risk sites.

• Fixed wheel and/or vehicle washing at site exit.

• Use fixed or mobile sprinkler systems to clean internal and external roads at least once a day.

• More information on controlling PM10 emissions from vehicle exhaust is provided in Section 7.


6.3 Site entrances/exits

Developers should employ the following control measures to help prevent dust being spread outside the site boundary by site vehicles at entrances and exits.

 Low Risk

• No extra control measures required if there are no nearby
sensitive receptors.

• Wash or clean all vehicles effectively before leaving the site if it is close to sensitive receptors. Ideally there should be a paved area between the wheel wash and before the public road.


 Medium Risk

• As for low risk sites.

• Provide a control zone around the site boundary to protect sensitive receptors (this could include an area of hardstanding).

• Provide effective vehicle cleaning and specific wheel-washing facilities at all exits; with hose pipes, adequate water supply and pressure and mechanical wheel spinners or brushes.


 High Risk

• As for medium risk sites.

• Put in place fixed wheel washing at all exits as well as procedures for effective cleaning and inspection of vehicles, which should include total vehicle washing and ticketing of vehicles.

• Vehicles carrying dusty materials should be securely covered before leaving the site.

• Enter all information, of vehicles entering/leaving site, in a log book.


6.4 Mobile crushing plant

This section only applies to construction sites that will operate mobile crushing plant at some point. This is an inherently dusty activity and will often be on sites normally classed as medium or high risk.

• Notify the local authority if a crusher is to be used as it has a duty to inspect the process. Mobile crushing plants are authorised as Part B processes, even if they are only temporary.

• Keep a copy of the permit on-site and adhere to the conditions therein at all times.

• Refer to Process Guidance note PG 3/16 (04)12 and use best available techniques (BAT) according to the guidance at all times (see Appendix 7).


6.5 Concrete batching

As for mobile crushing plants, construction sites with concrete batching plants will often be categorised as medium or high risk.

Developers following this guidance should treat such plant as authorised Part B processes, even if temporary, and employ the same level of best practice as indicated below. The local authority should be notified if a concrete batcher is to be used on site:

• Refer to Process Guidance note PG 3/1 (04)12 and carry out BAT (see Appendix 7).

• Wherever possible, these processes should be totally enclosed.


6.6 Excavation and earthworks

Excavation and earthwork activities can be a potential source of dust outside the site if they are not properly controlled. If these activities are essential, then developers need to act to minimise dust disturbance as much as possible.

 Low Risk

• All dusty activities should be damped down, especially during
dry weather.

• Temporarily cover earthworks if possible.

• Minimise drop heights to control the fall of materials.


 Medium and High Risk

• As for low risk sites.

• Re-vegetate earthworks and other exposed areas to stabilise surfaces.

• Only remove secure covers in small areas during work and not all
at once.

• Use hessian, mulches or tackifiers where it is not possible to re-vegetate or cover with topsoil.


6.7 Stockpiles and storage mounds

Developers should avoid the use of long-term stockpiles on site wherever possible unless it performs the function of visual or noise screening. If necessary, the following measures should be in place:

 Low Risk

• Make sure that stockpiles exist for the shortest possible time.


 Medium Risk

• As for low risk sites.

• Do not build steep sided stockpiles or mounds or those that have sharp changes in shape.

• Whenever possible keep stockpiles or mounds away from the site boundary, sensitive receptors, watercourses and surface drains.

• Wherever possible, enclose stockpiles or keep them securely sheeted.


 High Risk

• As for low and medium risk sites.

• Take into account the predominant wind direction when siting stockpiles to reduce the likelihood of affecting sensitive receptors.

• Seed, re-vegetate or turf long term stockpiles to stabilise surfaces or use surface binding agents that have been approved by the Environment Agency.

• Re-use hard core material where possible to avoid unnecessary
vehicle trips.

• Erect fences or use windbreaks such as trees, hedges and earth-banks of similar height and size to the stockpile to act as wind barriers and keep these clean using agreed wet methods.

• Store fine or powdery material (under 3mm in size) inside buildings
or enclosures.

• Contact the Environment Agency if you need an exemption to stockpile waste material, whose disposal is subject to the Waste Management Licensing Regulations (WMLR), 1994. The treatment or ultimate disposal of this material is subject to the regulations.


6.8 Cutting, grinding and sawing

Ideally, these activities should not be conducted on site and pre-fabricated material should be brought in where possible. In cases, where such work must take place, then the following techniques should be followed:

A simple method to reduce dust emissions when cutting or grinding

This method is suitable for all sizes of demolition or construction sites. When materials, such as concrete slabs or bricks, are cut with a power tool without extraction or suppression, a second worker can pour water from a plastic bottle over the material as it is being cut. This greatly reduces the amount of dust generated and can stop the occurrence of a statutory nuisance.

 Low Risk

• All equipment should use water suppressant or suitable local exhaust ventilation systems.


 Medium and High Risk

• Use dust extraction techniques where available.

• All other equipment should be fitted with water suppressant systems.

• Use local exhaust ventilation.

• Service all fans and filters regularly to ensure they are
properly maintained.


6.9 Chutes and skips

  Low and Medium Risk
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