Coho Water Resources
Integrated Water Resource Management
Groundwater Supply
We can help you with your groundwater supply whether it is a new system at the planning stage or an old system to bring back toward its original productivity. We have experience in developing groundwater supply in the sand and gravel aquifers of Puget Sound, the Ellensburg Sandstone of the Yakima Valley, the basalt aquifer of the Columbia Plateau, and other settings.
New Wells: We can guide selection of the appropriate drilling
method based on cost, site constraints, data needs, and the aquifer
formation. We know the drillers in the region well and work closely
with them through the design and execution phases of a project.
Drilling Methods: We are experienced with many types of drilling
including Cable Tool, Mud Rotary, Dual Rotary, Air Rotary, Reverse
Circulation, Diamond Drilling, Hollow Stem Auger, Push Probe, and
Sonic Drilling.
Well Rehabilitation: We can improve wells whose
productivity or efficiency have dropped off significantly. Decreased yields may be
due to biological, mechanical and/or chemical causes.
Redevelopment or rehabilitation can restore a well's original
yield and reduce electrical bills.
Routine checkups on wells can identify emerging problems so that corrections can be made under controlled conditions rather than an emergency. Coho can provide a simple management plan that typically involves several measurements a year. This data can be used to develop an appropriate rehabilitation schedule, if needed.
Examples of wells installed by Chris: typical services include siting, permitting, water rights, engineer’s estimates, bid specifications, construction management, design and testing.
| Location | Depth (feet) |
Flow (gpm) |
| Deschutes Valley | 330 | 5,000 |
| Ellensburg | 900 | 1,200 |
| Ellensburg | 1,100 | 1,600 |
| Ocean Shores | 100 | 500 |
| Randle | 80 | 500 |
| Shelton | 180 | 1,000 |
| Tumwater | 150 | 175 |
| Tumwater | 120 | 2,200 |
| Yakima | 900 | 3,000 |