Client: Moreton Bay Regional Council (MBRC)/Water Strategies via the Healthy Waterways Partnership
MBRC has identified the need to augment the Brendale Wastewater Treatment Plant (WWTP) to account for this future growth. The need for a ‘Sustainable Loads’ assessment was identified, which involved (i) an evaluation of current ecosystem health of the receiving waters in an Integrated Stream Health Assessment, (ii) determination of catchment and WWTP pollutant loads, and (iii) assessment of the environmental implications associated with various WWTP discharge options. The Integrated Stream Health Assessment was an integral component of the study, consistent with national and state guidelines and conducted in accordance with Ecosystem Health Monitoring Program (EHMP) methodology.
Outcomes and Benefits
It comprised assessment of the following stream health indicators: 1) Physico-chemical water and sediment parameters: diel range of dissolved oxygen and temperature; nutrients and Biochemical Oxygen Demand; pH, Electrical conductivity; and sediment trace metals. 2) Ecosystem Processes: Benthic metabolism; and stable isotope analysis of algal samples. 3) Biological Indicators: aquatic macroinvertebrates (Diversity, PET, SIGNAL); fish (PONSE, O/E50, alien fish species); and algae biomass in water column and sediment chlorophyll. The combination of stream health assessment, determination of catchment and WWTP loads, as well as the evaluation of various discharge scenarios with receiving river pool and estuarine box models allowed identification of recommended upgrade and discharge scenarios of the Brendale WWTP.
Services and Expertise Provided:
The Brisbane River Catchment Flood Study is the most detailed and comprehensive flood study ever undertaken in Australia. The hydraulic models that were developed underwent rigorous calibration. A sophisticated Monte Carlo approach was used to hydraulically model 11,340 flooding scenarios. The result was a robust and defendable set of design events. The study was fully peer reviewed by a panel of independent experts.
Environmental risk assessment of siltation dredging and dredge material management.
The coastal zone of Byron Shire has a history of erosion and inundation related to ocean storm tides and wave attack.
BMT conducted a Pilot Study of the College Park Landfill (CPLF), a 30-acre site operated as a municipal landfill from 1954 through 1978. Following closure, a cover was applied, but it was not closed in accordance with regulatory requirements. As landfills are known for their ability to mobilize hazardous substances into surrounding media, the CPLF was added to the U.S. Superfund (CERCLA) program for further evaluation.