Page 1769 - Week 07 - Tuesday, 29 May 1990
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MINISTER FOR FINANCE AND URBAN SERVICES
LEGISLATIVE ASSEMBLY QUESTION
WATER POLLUTION
QUESTION NO. 109
Ms Follett - asked the Minister for Finance and Urban Services on 27 March 1990
(1) How many water pollution traps are there in the ACT.
(2) What are the locations of the traps.
(3) What was the date on which each of these traps was last cleared.
(4) When is each trap next due to be cleaned.
(5) What quantity of waste is each trap capable of holding.
(6) To what use is.waste material from the traps put after collection.
(7) What contracts have been let for the cleaning of water pollution traps and at what cost.
Mr Duby - the answer to the Members question is as follows:
(1) There are a variety of water pollution control structures presently in operation as follows:
Gross Pollutant Traps. There are at present 17 in-ground and nine open gross pollutant traps in the ACT. Gross pollutant traps can be either in-ground or open and typically comprise a concrete basin and metal trash rack. They are designed to intercept and retain coarse sediment, trash and debris and act as the initial water pollution control measure in the stormwater system.
Trash Racks: Independent trash racks are metal racks that are placed across open channels and like gross pollutant traps act as initial water pollution control measures. The racks are designed to intercept trash and debris only and do not have a concrete basin to retain coarse sediment. These have been placed in older established areas where it is impractical to build a gross pollutant trap. There are five trash racks in the ACT.
Water Quality Control Ponds. Water quality control ponds are the final control measure before discharge to the Murrumbidgee River or urban lakes such as Lake Tuggeranong and Lake Ginninderra. Water quality control ponds are designed to trap water for sufficient time to allow for finer sediments to settle, nutrients to be taken up and self purification mechanisms to operate on other contaminants. There Ore five water quality control ponds in the ACT.
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