Sacramento Branch Meeting

The Sacramento Branch is pleased to present:

  "Groundwater Control Issues and Challenges for the EchoWater Project, Sacramento Regional Wastewater Treatment Plant (SRWTP), Sacramento County"

Presented By:

Stephen Thomas, CHG & Ted Hopkins, CEG

Shannon & Wilson

 The SRWTP provides wastewater treatment to the Sacramento area and surrounding cities, serving approximately 1.4 million customers.  To meet the requirements of a new Central Valley Regional Water Quality Control Board permit, the Plant is required to substantially reduce its nitrogen and ammonia effluent levels, and to install tertiary filtration and disinfection treatment for pathogen removal consistent with recycled water requirements under Title 22.  The EchoWater Project has been designed to meet these requirements, and consists of a series of facility and treatment improvements and upgrades.  The EchoWater Project is scheduled to be fully operational and permit compliant by 2023.  The EchoWater Project will include construction of biological nutrient removal basins, filtration units, pump stations, and a disinfection facility at an estimated cost of $1.8 to 2.1 billion.

Stephen and Ted will present and overview of the project and recent and ongoing groundwater control issues and challenges for the program.  This will include the hydrostratigraphy beneath the Plant, and design of a permanent underdrain system for a 60-acre storage basin, numerous temporary dewatering systems, and an assessment of the short- and long-term impacts of the dewatering on the Plant’s groundwater remediation system.  Major challenges for facility design and construction were the relatively shallow groundwater and an ephemeral surface water system.  They will present details of the development and application of a 3D groundwater flow model that informed the design and construction.


About the Speakers:  

Stephen Thomas, CHG, is Shannon and Wilson’s lead hydrogeologist and is based in Seattle, Washington.  He has more than 20 years of experience in groundwater resources, environmental and engineering consulting and construction management.  He performs and manages technical aspects of hydrogeological investigations for groundwater resources development, wellhead protection and groundwater management, groundwater contamination and waste disposal, dewatering and environmental projects.  He is a licensed hydrogeologist in California and Washington states.


Ted Hopkins, CEG, has been the Project Manager for most of Shannon & Wilson’s projects under the EchoWater program over the last 4 years and is Shannon & Wilson’s Sacramento office manager.  Ted is an engineering geologist with 28 years of experience, and his technical focus has been on the characterization of complex subsurface conditions to support engineering for large infrastructure projects throughout the western U.S.





All Proceeds to Benefit Science Students

GRA Sacramento Branch has a history of supporting university-level science students. Our Scholastic Sponsorship Program is an opportunity to publicize your business while contributing toward a good cause. The cost is minimal; if interested, please contact Judie Smith at 707-374-4300 or 209-712-9020 or

Costs and menu are shown below. GRA is unable to assure food and room for you without an RSVP. Using GRA's automated RSVP process is quick and painless!

Usual great food, including two meat entrées, salad, rice, potatoes, vegetable and Iced Tea. A No-host beer and wine bar will be available.

If you RSVP by Noon on Wednesday, September 14th the meeting costs are:

Members: $27.00
Non-Members: $32.00
Students: $10.00

*Retired professionals receive a 10% (rounded to the nearest dollar) discount on any meal. 

If you RSVP after Noon on Monday, September 12th, or walk-in, a $3.00 surcharge will be added to the meeting costs. Cancellations must be made by Noon on Monday, September 12th


Wed, Sept. 14, 2016
5:30 p.m. - 8:30 p.m.

Event has ended


Aviators Resturant
6151 Freeport Blvd
Sacramento, California 95822

Aviator's Restaurant within Sacramento Executive Airport
6151 Freeport Blvd., Sacramento, CA
Aviator's Restaurant at Executive Airport is located within the aircraft Terminal Building.
Thomas Bros. Map Book page 317, grid C6.
Plenty of free parking.