W.O. 12-47 WWTP Digester Gas Valve Replacement is a project to replace the valves at the WWTP digesters due to age and wear of the existing valves.  After further research, it was determined that the use of a valve coating applied to the inside of the valves can protect and extend the life of the eccentric plug valves up to an additional 10 years.  The methane gas produced by the digester is very corrosive and it was determined that this coating will protect the inside bodies of the 61 valves from premature wearing and deterioration.

The Council may:

• Approve Change Order No. 1 with Northwest Pipe Fittings in the amount of $7,227.32; or
• Do not approve Change Order No. 1. Disapproval of Change Order No. 1 means that the new valves can wear and deteriorate prematurely and there would be no extended service life of the valves.

Funding for this change order will be paid out of wastewater funds.  The original purchase amount was $53,932.  The change order is $7,227.32.  The total contract amount after this change order is $61,159.32. This change order reflects an increase to the contract of 13.4%. 

Staff recommends that City Council approve Change Order No. 1 for W.O. 12-47 WWTP Digester Gas Valve Replacement with Northwest Pipe Fittings in the amount of $7,227.32.