Advice from Coffs Council

Paul - further to our conversation the other day I would like to confirm the following:

The Hyrdro Digga contractor will be on site Monday 22nd at 7am to set up, and will start at approximately 7.30am pumping out the sediment from the upper lagoon (deposited as a result of sediment and erosion cotnrol failure from the development site).

Unfortunately, the contractor due to prior commitments cannot carry out further works at the lagoon on the same day.

It has been determined that the sediment and associated water will be wholly contained in the truck and removed from the site.  This means the water will not need to be released through sediment controls at the time of the works.

The works will progress despite the predicted 'low' and likely rainfall.

The potential for increased growth of the Salvinia resulting from nutrient flush from the pumping may result, and this growth will not be able to be controlled through herbicide spray due to the biocontrols (weevils) that have been introduced to the site.  The Salvinia control programme will continue to be monitored by Barry Powells.

I was unable to meet with the contractor today re the works on the southern side of the walkway.  However, Monday may be an opportunity for this to occur to get an estimation of costs.  I will be on site at 7am to monitor the works.  As far as I am aware the contractor fee is $330.00 per hour plus $50 per tonne for tip fees (this is for the smaller of the two trucks).  Once we have a vague idea of cost, it might be opportune to consider options in methodology to get the best bang for you buck, so to speak. What I’m thinking is that given the volume of material either side of the walkway, it may be more cost effective to use something capable of shifting larger quantities. Ben Lawson has asked that I give him an idea of the cost to tackle this area in addition to addressing the sediment from the development, but there is no budget allocation as yet.

Regards

Nat

Nat Redman (BAppSc Coastal Management) I Environmental Engineer  I  Coffs Harbour City Council I Survey & Design Branch  I  City Services Dept  I  Ph (02) 6648 4475 Mob: 0409 820 143 I  Email nat.redman@chcc.nsw.gov.au