GROUNDWATER DEVELOPMENT
• CPU Water Supply
• McAllister Springs Wellfield
• Tumwater Groundwater Study

PROPERTY TRANSFER
REMEDIAL INVESTIGATION & CLEANUP
EXPERT WITNESS
WELLHEAD PROTECTION
SOLID WASTE COMPLIANCE
WATER RIGHTS SUPPORT
DATA MANAGEMENT
GROUNDWATER MODELING
WATERSHED ASSESSMENT
AQUIFER STORAGE & RECOVERY
WASTEWATER & STORMWATER RECHARGE
 

Client: City of Tumwater
Project: Groundwater Resource Evaluation
Location: Tumwater, Washington

Background
The City of Tumwater formerly obtained its water supplies from a very limited number of high-capacity groundwater sources. To provide for future growth and increased water supply security, Tumwater needed to develop additional groundwater sources.

Challenges
Although the gross layering of aquifers and aquitards is consistent across most of the City, the productivity of the primary water supply aquifer is not uniform. In addition, existing, and potential future pollution sources as well as proximity to the salmon-bearing streams imposed restrictions on feasible well sites.

Approach
To locate possible areas for exploration, we created maps of drainage features during the last ice age, and showed that they correlated to well productivity in the primary water supply aquifer. We then assessed the vulnerability of each potential wellfield site to water quality impacts and conflicts with surface water resources. We also analyzed water rights information. Based on this work, we recommended drilling and testing wells in several areas.

Outcome
Subsequent explorations confirmed that yields of up to 2,350 gpm were available (the single highest City well yield) at the sites we recommended. During the next phase of this project, we assisted the City in installing production wells and addressing water rights issues.

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