Page 87 - agl036_D9

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Sustainability Performance Report 2012 85
Environmental Risk
AGL’s approach to waste management is consistent with
the waste management hierarchy, where the approach
taken, in order of decreasing preference, is to avoid,
reduce, reuse, recycle and responsibly dispose of wastes.
This approach reduces the impact of our activities on the
environment, and reduces our operating costs and risks.
AGL’s operations produce a variety of different waste streams
which are either reused, recycled or disposed of to landfill.
At AGL’s industrial sites, opportunities to reuse wastes are sought,
and materials such as scrap metal and waste oil are recycled. The
management of drilling muds and cuttings will be an increasingly
important issue for our coal seam gas projects as these projects
move from exploration to production. Hazardous wastes are
transported to licensed waste management facilities using
regulated waste tracking systems.
At AGL’s call centres and major offices, waste is segregated and
paper, cardboard, and common domestic recyclables are collected
for recycling.
Water-based waste streams from AGL office and operational sites
are discharged either to sewer under licence from the relevant
water authority, or treated and discharged in accordance with
requirements of relevant regulatory authorities.
Hazardous waste
During FY2012, AGL generated around 280 tonnes of hazardous
waste. More than 70% of the hazardous waste generated was
waste oil and oily waste that was collected and sent to recycling
facilities, where it can be cleaned up and reclaimed for use as an
alternative fuel.
Around 40% of the hazardous waste that was disposed of to
landfill was generated at Torrens Island Power Station, and included
contaminated soil, asbestos and grease trap waste. These wastes
were disposed of at licenced waste disposal facilities in accordance
with South Australian EPA requirements. Smaller amounts of
hazardous waste, such as waste oily rags and waste chemicals, were
generated at a range of other operational sites.
Non-hazardous waste
During FY2012, AGL generated approximately 6000 tonnes of non-
hazardous waste. Around 68% of non-hazardous waste generated
comprised drill cuttings from the Camden Gas Project, which were
subsequently recycled. In FY2012, 4,000 tonnes of drill cuttings
were dried and then diverted to a Sydney-based company which
cleans, screens, separates and uses the drill cuttings to make a
variety of construction materials, including bricks.
The remainder of the non-hazardous waste produced at AGL sites
in FY2012 comprised mostly ‘general waste’ that was disposed of
to landfill, and materials that were collected for recycling, including
paper, cardboard and scrap metal.
In FY2012, more than three quarters of the wastewater generated
from AGL offices and operational sites was sent offsite, mostly via
sewer, for treatment. The remaining wastewater included sewage
that was treated and disposed of onsite at Torrens Island Power
Station, and wastewater that was treated and disposed of onsite
at Hydrocarbon Extractions. At the Hydrocarbon Extractions plant,
purged water from the cooling tower and stormwater runoff from
the site are spray irrigated in accordance with an EPA licence. The
stormwater runoff passes through an interceptor to remove any
hydrocarbons that may have been picked up by rainwater falling
on the plant, prior to irrigation.
The management of produced water that is a by-product of
upstream gas production and exploration projects is discussed
separately on page 88 of this report. The management of marine
water which is used for cooling at Torrens Island Power Station and
then returned to the source environment is discussed on page 87.
Waste Streams
Hazardous waste disposed 25%
Hazardous waste recycled 75%
Hazardous waste
Non-hazardous waste
Non-hazardous waste disposed 21%
Non-hazardous waste recycled 79%