Water supply work continues at Well 2 located in Roy Raley Park. The new pump is scheduled to arrive to the site on Wednesday, along with other replacement pumping equipment. Pump installer is expected to move directly from removal of existing pumping equipment to installing the new pump and new pumping equipment to expedite putting Well 2 back on-line. Well 2 may be back online by the end of this week.
The city is also adding about 40-feet of additional 8-inch column pipe and other pumping equipment to set the new pump about 40-feet lower in the well hole. This would lower the pump setting from 400-feet to about 440-feet below ground level to better address continued water level declines in the aquifer. The lowering of the pump has to do with falling, or declining, aquifer water levels. The city’s Aquifer Storage & Recovery (ASR) Program has reduced the decline to an average of 1.25-feet per year since late-2003, or 17.5-feet over the last 14-years. Prior to the ASR Program, the groundwater decline averaged 3.4-feet per year, which would have equated to about 48-feet over the same 14-year period. This has a long-term affect for all water supply wells for the City of Pendleton.
Damage to the overall pumping equipment is severe, with complete loss of the pump and damage to the equipment inside the column pipe. As shown in the attached photos, some column pipe is being cut loose with blow torch in order to remove it – it has spun so tight, it cannot be loosened by normal means. This is due to complete pump failure with the motor still trying to turn the pump. This led to additional damage by tightening the shaft and the column pipe. The city expects to replace almost all the shaft from the motor to the pump, almost all of the spiders that hold the shaft centered in the column pipe, and about half of the 10-inch column pipe. This is based on early observations of the equipment that has been removed from the well hole. Additional considerations will be made once all the equipment is out of the well hole and available for inspection.
Total repair to this well is now estimated at over $80,000.
City water supply is balanced with customer demands and the cooler weather is also helping. City staff continue to stay in contact with the largest water customers, including city parks, in regards to managing irrigation needs and the water supply.
The city appreciates the efforts by all water customers to assist in reducing their water usage during this event.
- Pump Removal Setup
- Column Pipe Shaft Removed
- Close-up of Cut Column Pipe
- Close-up of Spiders for Centering Shaft