Water update - August 9, 2017
Posted on Wednesday August 09, 2017 at 12:01PM
We appreciate the continued patience of residents while we continue to work on solutions.
We are pleased to report some areas are indicating improvements, but others continue to experience the taste and odour issue albeit at lower levels. Our thanks go to our residents in assisting in identifying areas where changes are occurring, and we ask that continue to let us know of the changes you are experiencing. Water treatment is a complex operation and we must ensure that any steps we take are approached logically and measured and evaluated for impact to the problem to be resolved.
Summary of actions and considerations for solutions to date:
We continue a daily hydrant flushing program to assist with discolouration and through put in low flow areas.
A raw pond study has now commenced and will provide essential answers to allow the decision-making process to continue on a cost effect path for Thorsby, as to the cause of the taste and odour.
Quotes on desludging received. Findings from 2 of the 3 companies contacted indicated by traditional methods, that only 8 – 12 inches of sediment is in the ponds, which is much less than the depth that dredging usually is carried out. A third company provided a quote of $5,960 to map electronically the sediment and provide a desludging proposal if necessary. Quotes from the first two companies, came in at $434,050 and $196,100 respectively.
Possible addition of potassium permanganate prior to treatment, as indicated by Alberta Environment – as an aid to address taste and odour. Optimal delivery system would need to be designed and installed and would require engineering sign off. Costs of design and installation are not known at this time and operating procedures and testing would need to be updated also – Design and subsequent costing is in discussion.
Investigating options regarding Reverse Osmosis/charcoal filtration systems. Still in early stages of establishing costs. System requirement and direction would be dependent upon outcome of the pond study. Initial findings indicate a huge variation in scale, dependent upon rental, purchase or in home installation.
We will continue to provide a weekly update to our residents as we continue to work on this issue.
Author: Town of Thorsby