The Trinity River Authority (TRA) operates five regional wastewater treatment systems that serve the central portion of the Dallas-Fort Worth Metroplex. These plants have a combined, permitted treatment capacity of 234 million gallons per day (MGD). We have supported TRA for over 40 years with master planning and providing solutions to regulatory challenges. This support has included the following:
- Las Colinas Reuse System—We were instrumental in developing, with TRA, the largest reuse project in Texas in the 1980’s. This project provides up to 8,000 acre-feet per year of effluent from the TRA Central Regional Wastewater System to supplement the water features and the irrigation supply for the premier multi-use development Las Colinas in the central area of the Metroplex. Obtaining permits for the continued operation of this system has required extensive negotiation with both the Texas Commission on Environmental Quality (TCEQ) and the US Environmental Protection Agency (EPA), and studies, regarding the status of elements of the reuse system as Waters of the United States and water quality standards for those waters.
- Denton Creek Regional Wastewater System—This system was experiencing rapid growth pressure when the TCEQ concluded there was no assimilative capacity for increased discharges from the plant. We developed and implemented a regulatory strategy for obtaining a permit for that has enabled current and future expansions.
- Other—Other areas of support have included developing a solution to one of the early cases of failure of the Whole Effluent Toxicity test and developing pretreatment programs tailored for plants serving multiple cities operating satellite systems.
As we have provided on-going support to TRA for multiple permit renewals and amendments and master plans, we have used our knowledge and skills in water quality, water quality modeling of lakes and streams, TCEQ and EPA regulations and policies. Working closely with APAI engineers, we have developed efficient, cost-effective solutions to permitting and treatment challenges so that TRA continues to meet its commitment to operating award-winning plants that provide high-quality effluents that are protective of the receiving waters.