The Trinity River Authority (TRA) was evaluating the replacement in place of the existing unlined 18-inch reinforced concrete pipeline with a new 30- to 33-inch pipeline, or the addition of approximately 5,710-linear-foot new parallel 24- to 33-inch-diameter pipeline to provide additional capacity to convey existing and projected 2040 wastewater flows from the Cedar Hill lift station to the Dallas/Ellis County boundary (RO-4).

VRX prepared an environmental assessment documenting the social and natural environment the impacts associated with the proposed rehabilitation of a sanitary sewer line located within the Red Oak Creek floodplain. The environmental assessment was prepared in accordance with Texas Water Development Board guidelines for Clean Water State Revolving Fund Tier II projects.

VRX conducted delineations of waters of the U.S., mapped vegetative communities, described geological and hydrological elements, assessed wildlife communities and conducted a Phase I environmental site assessment.  Additionally, VRX coordinated with a third-party consultant to include historical and archeological resources in the environmental assessment. VRX coordinated with state and federal agencies, including the Texas Parks and Wildlife Department, U.S. Fish and Wildlife Service, Texas Historical Commission, USACE and Texas Commission on Environmental Quality. The environmental assessment was provided on schedule and under budget.