Attachment 1A - ChangeExistingApproval-132005 1550 03 - Stage 1

ecoaccess

envircnmontal cances and pormits

Effluent treatment ponds and contaminated stormwater collection pond conditions

{C5-1) All ponds used for the storage or treatment of contaminants or wastes must be installed,
operated and maintained to prevent any discharge through the bed or banks of the pond from
causing environmental harm or environmental nuisance in any waters (including ground waters).

(C5-2) All ponds used for the storage or treatment of contaminants or wastes must be installed and
maintained so that a freeboard of not less than 1.0 metres is maintained at all times. Should the
level rise above the 1 metre freeboard immediate action must be taken to remediate the
situation. This may include tankering the waste to a facility licensed to receive and treat such
wastes.

(C5-3) Suitable banks and/or diversion drains must be installed and maintained to exclude stormwater
runoff from entering any ponds or other structures used for the storage or treatment of
contaminants or wastes.

(C5-4) All ponds used for the storage or treatment of contaminants or wastes must be installed and
maintained to ensure the stability of the pond’s construction.

(C5-5) All ponds used for the treatment of contaminants or wastes must be operated and maintained in
such a manner that short-circuiting of the flow of the contaminants or wastes does not occur.

(C5-6) An operational back-up pump must be provided on site at all times.

(C5-7) Prior to commencement of the activity a liner system of at least 600 mm compacted clay material
of an in-situ hydraulic conductivity of equal or less than 1 x 10° metre per second or using.an
equivalent best practice containment technology, must be installed and maintained in any
‘effluent treatment ponds and contaminated stormwater collection pond on the licensed place
effectively minimise the likelihood of any release of contaminants to groundwaters.

Monitoring of groundwater

(C6-1) Prior to the instellation of the lining of the effivent treatment ponds a groundwater monitoring
program must be developed and implemented to monitor the quality of groundwater affected, or
likely to be affected, by the indirect discharge of treated waste water to the groundwater. The
system must include a sufficient number of wells installed at locations and depths which yield
representative water level and water quality groundwater samples from the uppermost aquifer
and that establish:

i. | Groundwater quality adjacent to the treated effluent storage dam and down hydraulic
gradient so that any indirect discharge of wastewater will be detected;

ii. Groundwater quality at location(s) representative of background groundwater quality, that is
up hydraulic gradient of the disposal area and is not affected by the release of
contaminants at the place to which this permit relates; and

iii, | Groundwater quality located within the designated 38000 square metre land disposal area.

(C6-2) The groundwater monitoring program referred to in condition (C6-1) must be developed by a
person possessing appropriate qualifications and experience In the fields of hydrogeotogy and
groundwater monitoring program design to be able to competently make recommendations
about these matters.

(C6-3) Locations for groundwater monitoring facilities must be given with reference to horizontal
coordinates of such facilities accurate to 1.0 metre.

 

* Permit includes licences, permits, permits, authorisations, certificates, sanctions Page 10 of 24
cr equivalent/similar as required by legislation administered by the «
Environmental Protection Agency and the Queensland Parks and Wildlife Service

Queensland Government

Environmental Protection Agancy
www.epa.qid.gov.au awar 221 160 738 Exvtronmental Leer Agency