| Project Description |

Alliance designed extensive modifications to enhance the treatment process at the T.L. Amiss Water Treatment Plant in Shreveport. These modifications are required to meet new EPA requirements. Construction is currently underway.

In order to centralize the plant chemical feed systems, a new Chemical Feed Building was proposed. The proposed Chemical Feed Building will not only centralize most of the chemical feed systems, it will also satisfy the requirements stipulated in the Risk Management Program.

The Risk Management Program requires that the chlorine storage facilities be stored in a manner that will safeguard the general public if there was an accidental chlorine leak. To fulfill this requirement, the proposed Chemical Feed Building will contain a Chlorine Scrubber that will collect the escaped chlorine fumes in the affected room and neutralize that gas before releasing it into the atmosphere. The proposed Chemical Feed Building will also follow the Life Safety Regulations stipulated in the Standard Building Codes for hazardous materials.

The proposed chemical feed systems located in the Chemical Feed Building will be controlled automatically in order to match changes in plant flow or raw water conditions. The automatic feed controls will reduce operator interaction and result in more accurate control of the plant dosage systems. The operators will also be able to control the chemical feed systems through the Supervisory Control and Data Acquisition System (SCADA).

The following chemical feed systems will be housed in the building: aluminum sulfate (alum), sodium hydroxide (caustic soda), hydrofluorosilicic acid (fluoride), soda ash, polymer, sodium chlorite, and ammonia.

The next project was a Lime Building project, which consisted of the following: removal and disposal of existing bulk storage tanks and feeder systems; installation of new bulk lime storage tanks; installation of new feeder system; electrical upgrades which include automatic sensors and feeders; architectural improvements to the building; integration with SCADA for full automation of the system; improvements to the existing drainage system.

The T.L. Amiss Water Treatment Plant contains 24 filters located at two filter buildings. Filter Building No. 1 houses 16 filters and Filter Building No. 2 houses eight filters. The work is taking place in both filter complexes but has been staged to keep the plant in complete operation during construction.

The modifications to the filters consist of replacing the media and under drains in each basin. The new system is a Leopold “S” block with the IMS cap and an air/water backwash. The gravel layer is being replaced with the use of the IMS cap on the filter blocks. New electrically operated valves are being installed in the pipe gallery. The air scour system requires a new blower building constructed for each filter building. The air piping for each filter building and to each basin is stainless steel.

The controls for the filters are being upgraded with a new Supervisory Control and Data Acquisition (SCADA) system. This type of SCADA system consists of state of the art equipment. The system is a pc-based system with ethernet connection cable and redundancy for reliability. The new consoles for each filter have a touch screen display and an industrial pc (IPC) for control of each filter. The system is being set up so that it can be fully automatic, manual or any level in between. The filters can be controlled from any console or the operator station in the building or even from the control room in the Administration building.

Along with the work on the filters, some architectural renovation and construction of the building is taking place. Both filter buildings are going to be air conditioned and have new flooring. Filter Building No. 1 will also have new windows and roof decking.

The majority of modifications and improvements required at Plant No. 2 are essentially equipment replacement because of the age and condition of the existing equipment. Other improvements for this area of the treatment plant are involved with safety issues, current code requirements, improved control functions, and improved area lighting.