Page 8 - Surface Water Management Guidance - 2023

4.3 Metals Water Management Support Services
Metal rich waters can occur as a result of three main sources, namely:

• Extraction of minerals and ores; John F Hunt Water Tech focuses on water
• On Brownfield land as a result of man’s activity; management issues. It provides advice and
• Natural occurring in the soils and rocks. support internally across the John F Hunt Group
and directly to construction and industrial clients.
Phytotoxic metals are harmful to vegetation, zootoxic metals are harmful to vertebrates and inver-
tebrates. Metals may also bio-accumulate within the food chain. In respect of the Construction Business Sector,
Water Tech can provide support to a project
The build up of metals within sewage sludge, means that metals discharges to foul sewers are also throughout every phase - Pre-construction,
tightly controlled. Construction and Project Completion. A summary
of the support services which can be provided
are given below.
4.4 Fuel and Oils
Fuels (petrol, diesel, kerosene) and oils (lubricating oil, engine oil and tars) can be present on nearly 5.1 Pre-Construction
all brown field land sites. Other organic compounds e.g. chlorinated solvents and creosote may be Pre-Construction support services define the scale of the water management issues that will be
present as a result of particular industrial activities which have been undertaken. encountered by the project and the identification of cost-effective solutions to mitigate areas of
concern. Any measures considered must be practical and ensure that the site will be able to remain
Organic compounds may be present as a separate liquid phase (NAPL) or may be dissolved within legally compliant.
the water.
• Identifying permit and consent issues. Measures
They principally pose a hazard to the environment as a result of either: their toxicity; their ability to to obtain all necessary permits/consents for Key Points to be addressed during
coat surfaces; biodegradation consuming oxygen dissolved within the water. the discharge and/or treatment of the excess Pre-Construction.
water, including required timescales.
• How much water (surface water and
• Preparation and submission of applications groundwater) will be generated?
for permits and consents. Permitting issues • What can be done to reduce the
can not be left unaddressed and need to be volume of water that will need to be
progressed in-advance of the site works. treated?

• How will the water be disposed?
• Development of a written water management
plan to be used throughout the Construction • What permits/consents will be required
Phase of the project. and how long will they take to obtain?

• What treatment water quality stand-
• Development of cost model (Capex and ards will be applied to the discharge?
Opex) for the implementation of the Water
Management Plan. Allowing adequate • What are the options for treating the
financial provision to allow proper operation water to the required standard?
of the site throughout the construction phase, • What size will the treatment system
minimising the potential for the site to affect needto be and is sufficient space on site
the local environment. available?

• What are the Capex and Opex costs
• A successful outcome for the project may associated with the treatment and/or
be reflected by the thoroughness of the management of the water treatment
information collected and evaluated during system?
the pre- construction phase.