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 Olympia
Project: McAllister Springs Wellfield Development
Location: Olympia, Washington

Background
McAllister Springs has supplied most of Olympia’s drinking water since 1949. However, recent studies by PGG and others have highlighted the springs’ susceptibility to land use impacts, which could diminish water quality during periods of heavy demand and drought. To address these concerns, the City of Olympia decided to replace this supply source with high-capacity wells.

Challenges
PGG needed to identify an optimum location for a new wellfield—one where sufficient supplies of groundwater could be obtained and where land use activities would be unlikely to impact water quality. Furthermore, we needed to assess the possible environmental effects of operating such a wellfield, including impacts to nearby water users, surface water bodies, habitat, and aquatic resources.

Approach
Our work for this project began with a hydrogeologic characterization of the McAllister Springs area. After identifying an optimal location for a wellfield, we designed and tested a series of wells to assess potential yields and water quality. We also helped the City address regulatory issues related to procuring water rights.

Outcome
PGG installed two high-capacity production wells that now supply up to about 5 MGD (million gallons per day) of water. The comprehensive monitoring network we developed provides information about long-term trends in water levels.

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