SSLGC Water System Master Plan, Water Treatment Plant Expansion and Treatment Facility Rehabilitation - Nixon, Texas

Services:

Data Collection • Master Plan Report • Water Master Plan • Corporation Engineer

The Schertz-Seguin Local Government Corporation (SSLGC) is a wholesale provider of potable water serving over 50,000 residents of Schertz and Seguin, as well as the Cities of Selma and Universal City and the Springs Hill Water Supply Corporation on a contract basis. SSLGC operates 8 water supply wells pumping Carrizo Acquifer water through over 42 miles of pipeline to Schertz and Seguin following treatment. The 18 MGD SSLGC water treatment facility, located in Gonzales County, provides iron and manganese removal, pH adjustment and disinfection using permanganate oxidation, pressure filtration, caustic addition and chlorine addition.

In the Fall of 2005, Bury+Partners was authorized to prepare a Water System Master Plan that included:

• An inventory of the existing SSLGC water system components, an evaluation of historical water demands and population for SSLGC customers, projections for future water demands over the next 50 years, and a comparison of the capacity
  of system components to the projected average and maximum daily demands.
• An evaluation of regulatory issues that may affect SSLGC .
• An evaluation of operational improvements and specific alternative plans for
  SSLGC to follow to meet capacity needs and to implement operational improvements.
• A financial evaluation that compared the costs SSLGC incurs delivering water to
  its customers to the cost SSLGC charges for that water.

Bury was also contracted to provide design engineering services for a 6 MGD expansion of the SSLGC water treatment plant. The expansion was constructed using a design-build approach and includes the following improvements:

• 6,200 foot expansion of the existing treatment building
• 3 pressure filters
• Chemical feed system modifications
• Piping and site work improvements
• Control and electrical improvements

Bury was then contracted to provide consulting and design engineering services to address water chemistry issues causing media breakdown and corrosion in the existing pressure filters. Bury staff analyzed the Carrizo Aquifer water chemistry and looked at various chemical feed alternatives to adjust the pH and alkalinity of the corrosive water. A lime feed system was selected, designed and constructed under the management of Bury staff and has solved the corrosion and media disintegration problems plaguing the plant.

Bury also evaluated and selected replacement filter media prepared construction documents and provided construction administration for the rehabilitation of existing pressure filters.