Tab A-3 Performance Work Statement Cross Connection Haz Assesment

PERFORMANCE WORK STATEMENT (PWS)

Initial Cross-Connection Hazard Assessment

Defense Distribution San Joaquin, CA

1.0 General Information

1.1 Background: The Defense Distribution San Joaquin (DDJC) facility located in Tracy, California, requires a comprehensive Initial Cross-Connection Hazard Assessment of its potable water system. The installation's water infrastructure currently includes one groundwater source, on-site pumping and treatment facilities, an elevated potable-water storage tank that supports distribution-system pressure, a campus-wide distribution system, and 43 served buildings. 1.2 Objective: The primary objective of this requirement is to conduct a baseline, comprehensive cross-connection survey of the DDJC drinking water system to identify actual and potential cross-connections, determine the degree of hazard, and evaluate the adequacy of existing backflow prevention assemblies. This effort is essential to protect the potable water supply from direct interconnections with non-potable piping networks and prevent the backsiphonage or backflow of contaminants into the distribution system.

2.0 Scope of Work

The Contractor shall provide all personnel, equipment, tools, materials, supervision, and other items and non-personal services necessary to perform the Initial Cross-Connection Hazard Assessment as defined in this PWS. The assessment must align with applicable federal, state, local, and military regulations (such as TB MED 576 and relevant plumbing codes) governing cross-connection control and backflow prevention.

3.0 Specific Tasks

3.1 Comprehensive Site Survey: The Contractor shall conduct a physical survey of the DDJC potable water system. The survey shall encompass: The single groundwater source and associated on-site pumping and treatment facilities. The elevated potable-water storage tank.
The campus-wide water distribution system.
The interior and exterior of all 43 served buildings, including mechanical rooms, boiler rooms, fire suppression system connections, industrial areas, and irrigation connections. 3.2 Hazard Identification and Classification: During the site survey, the Contractor shall: Identify all existing or potential cross-connections between the potable water system and any non-potable water systems, equipment, or fixtures. Classify the degree of hazard (e.g., High, Low) for each identified cross-connection based on the most recent Uniform Plumbing Code and standard military public health guidelines. 3.3 Evaluation of Existing Devices: The Contractor shall inspect all currently installed backflow prevention devices and assemblies to determine: