Trinity River Authority 72-inch Wastewater Interceptor Risk Assessment

Arlington, Texas

Description:

The Trinity River Authority selected LAN to prepare an evaluation study, preliminary design, permitting, archeological and environmental documents, and detailed design and bid documents for a four-mile segment of their Central Regional Wastewater System (CRWS). The CRWS is a 162-mgd system that provides regional wastewater collection and treatment services for approximately 1.2 million people residing within 20 cities in the Dallas/Fort Worth metropolitan area. The existing interceptor was constructed in the early 1970s as a 48- to 60-inch diameter pipeline. Hydraulic analysis determined that the interceptor had insufficient capacity to convey projected year 2020 flows and, due to long-term exposure to hydrogen sulfide conditions, had substantial pipe corrosion. The interceptor will be replaced or rehabilitated to convey projected year 2040 flows. LAN is also securing and coordinating acquisition of additional easements, surveying, geotechnical investigation, and field evaluations to obtain the necessary information for the design.

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