River Casestudy

In: Science

Submitted By Georgehutchinson
Words 1233
Pages 5
In July of 2005 an angler reported a fish kill on the river Tolka at Clonee to the ERFB
The ERFB sent out fisheries environmental officers.
On site inspection reviled a discharge pipe leading from a abattoir close by.
The area around this pipe was chemically burned and the water was discolored
The area was absent of flora and fauna downstream from this point.
This was a point source pollution event. (1)
Upstream approx 5M there was small fish alive but were absent downstream

They proceeded to take samples of water in a standard method
During this process it was noticed that a smell of noxious gases was increasing
A shortness of breath and a skin /eye irrigation by the officers accursed
The discharge pipe expelled a fluid 5 m into the river with a high flow rate
Photos were taken by the EFOs
This contained for approx 5 mins

This point source smelling of ammonia and the visual impact on the downstream area would give rise to the opinon that this was the pollutant. (3)
Samples were collected from pipe directly the river and various positions downstream and upstream
Then all the samples were collected and labeled
Then EFO s then visited the factory an abattoir owned by KEPAK MEATS Ltd

They insisted that guarantees be given to stop this effluent discharge immediately
Senior staff gave this guarantee
This was the best effort taken by the EFOs to contain the pollution (2)
Upon further inspection and a elecrofishing survey completed it was found that a 100% mortality fish kill had happened to all salmonid species downstream for 7km.

The fish kill was in it 1000,s and most of the macro invertebrate life.

It may have taken a few days for the pollution to discharge and with a lot of dead fish in the river it would not have been safe to swim in.
However the Tolka discharges into Dublin Bay at Dollymount Strand a popular Blue Flag Beach.…...

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