The river is now going to need monitoring to help understand the long term impact on wildlife
The wildlife group carried out checks for wildlife in distress, surveying numbers of river flies and varieties of invertebrates.
While results were normal for the time of year, water quality tests indicated fluctuating high levels of ammonia. The following day, the group reported high levels of ammonium had impacted dissolved oxygen in the water, affecting fish and invertebrates. The group monitored both and said so far problems had been avoided, with Thames Water aerating sections of the river and the Environment Agency monitoring fish stocks.And on October 5, the group shared new concerns. A post read: “This water quality issue in the Chess is a bit of a rollercoaster ride. No sooner are we encouraged by improvements than levels of NH4 Ammonium start to rise.
The company added that it “worked hard” to increase treatment capability and reduce the impact as “rapidly as possible” and said ammonia and dissolved oxygen levels are now back to normal with aerators, used to tackle ammonium, stood down yesterday .
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