This project for the Washington Suburban Sanitary Commission (WSSC) involved the development of contract drawings and specifications for the construction of orthophosphate feed systems at the Potomac and Patuxent Water Filtration Plants.  The feed systems will be installed to reduce the occurrence of pinhole leaks in copper pipe in the distribution system.  The systems will be installed as an immediate/interim measure and designed to allow maximum re-utilization of equipment and materials in the permanent facilities.  The immediate nature of the required interim measures necessitated an extremely fast-tracked design schedule.

Specific elements of the design included:

• Site plans including: locations of existing features such as major structures, parking lots, and access roads; location of proposed features such as storage tanks, containment area, equipment shed; and yard piping and sediment control measures, as applicable.
• Structural designs for tank containment area, tank and building foundations at Patuxent, and two concrete vaults at Potomac.
• Piping plans and pump configuration details within buildings and vaults, connections to existing utilities, and appurtenant details.
• Interface with existing utilities including electrical and control systems, and water for new safety systems.
• Controls design including process and instrumentation diagram(s) identifying pertinent instruments, variable feed pumps, new digital alarm inputs to an existing PLC, new analog output(s) from an existing PLC, and logic statements for flow-paced control of the chemical feed pumps. 
• New electrical service to new equipment at both sites, and power and lighting systems associated with the new facilities.
• Mechanical systems including heating and ventilation of the proposed equipment shed at Patuxent.

Upon completion of this design phase, JMT assisted WSSC in the "fast track" equipment procurement and construction based on the original design.  This demonstrated JMT's flexibility and responsiveness.