Hydrogeological Services for the Drilling and Construction of Three Perris II Desalter Brackish Water Wells
Eastern Municipal Water District (2010 – 2016)
The Eastern Municipal Water District is in the process of increasing its water supplies through the development of groundwater impacted by high salts from historical agricultural activities. TH&Co has played a key role in developing this resource through initial hydrogeological studies of the Perris Basin, well siting analysis, initial test drilling, and assistance with permits from both the California Department of Drinking Water and Regional Water Quality Control Board.
Since 2010, TH&Co has been providing well design and construction management support for the drilling, construction, and equipping of the desalter wells. This work has included:
- Preparation of detailed technical specifications for four
high capacity brackish water production wells.
- Site inspection during drilling, geophysical logging,
isolated aquifer zone testing, well construction, well
development, pumping tests, and project closeout (disinfection, final video and alignment testing)
of three of the production wells.
- Development of final well designs for three wells based on analysis of lithologic logs, geophysical logs, sieve analyses, and isolated aquifer zone testing
- Preparation of reports summarizing the work.
Wells 93 and 95 were successfully constructed with design discharge rates of 2,500 and 2,000 gallons per minute, respectively. Well 96 was successfully constructed with a design discharge rate of 1,000 gpm. Discharge water from each well was suitable for direct supply to the Reverse Osmosis desalter plant. Well 94 is scheduled for construction in 2017. The project was completed on time and within budget.