2013-05-28-council-agenda - Taupo District Council

Turangi Wastewater Treatment Plant Optimisation
Scheme Turangi WWTP Optimisation Month Number
Contractor n/a Month Ending 30 April 2013
Budget $ 2,500,000 Contract Number
Expenditure $ 60,498 Commencement Date
Commitments $ 29,780 Contract Completion Date
Forecast Cost $ 2,500,000 Anticipated Completion Date June 2014
Overall Progress
Investigation Phase
Preliminary Design
Detailed Design
Construction
90% (site trials to complete)
40% (pond design and cleaning facility)
0%
0%
Detailed Progress
The investigation and membrane fouling analysis to optimise the wastewater plant has been completed; an enhanced (ex-situ)
chemical cleaning process is proposed along with a new (lined) buffer pond. Preliminary design is about to commence with
detailed design expected to be completed by Dec 2013.
A construction cost estimate based on the concepts developed is $1,200,000 for a new lined pond.
A budget of $900,000 is budgeted for a chemical cleaning plant.
An estimate of $950,000 for membrane capacity expansion (high probability this is not required).
The first site trial was conducted by TDC operations team on 15 May to prove the cleaning concept prior to commitment to
detailed design. The trial is in two parts, a "clean in place' trial and an ex-situ clean trial. Results of the trial are currently being
evaluated. Note: The ex- situ lab trial shown positive results. Once the trials are completed the decision as to which of the
above will be implemented can be made. A new pond will provide long term benefit. The decision regarding chemical, cleaning
plant or membrane capacity expansion or the alternative of do nothing and replace fouled membranes will be made following
the site trials and financial analysis. The preliminary design of the lined buffer pond is completed.
Construction (requirement to be confirmed) is expected to begin in 2014.
Key Risks
Cost estimates are to be remade after the preliminary design. Cost risk is the most significant risk.