Portfolio

PETRONAS Floating LNG 2 (PFLNG2) is the second of PETRONAS’ floating Liquid Natural Gas (LNG) vessel facilities. It is designed to receive, treat, and liquefy natural gas from stranded gas fields from offshore Sabah and store the LNG product before being offloaded onto carrier vessels. The feed gas supply for PFLNG2 from the Rotan gas field is operated by PTT Exploration and Production Public Co. Ltd. (PTTEP) with potential tie-ins to other nearby gas fields within a 20 km radius of Rotan field. Installation of subsea facilities (wellheads, manifolds, flexible flowlines and umbilicals) within Block H that will connect to PFLNG2, is undertaken by PTTEP.

The offshore field sampling plan encompassed the collection of sediment and water from 6 sampling stations with water depths greater than 1500m. Deep sea samples were collected with a box corer which collected more than 50kg of sample per deployment. Sediment samples were processed for macrobenthics, oil and gas products, metals and organics. Deep sea water samples were collected just above the seabed, mid water column and near the surface using a rosette sampler. Water samples were analyzed for metals, nutrients and oil and gas products. A post EIA monitoring report was presented to the Department of Environment Malaysia.

Big Glory Bay (BGB) is a semi-enclosed embayment situated on the northeastern side of Stewart Island. BGB is the site of more than 38 mussel farms and 4 fish farms annually producing 4,000 tons of mussels and 6,150 tons of Salmon respectively. As part of the farm’s resource consent conditions, which are approved and monitored by local government, ADS undertakes annual seabed sampling at more than 25 stations across the bay including in and around existing farms, fallowed sites and control stations. Samples are processed for macrobenthic invertebrates, zinc, copper, organic content and sediment grain size distribution. Seabed video footage is also collected along with intact sediment cores highlighting the seabed sediment-water interface. In addition to seabed sampling, ADS also presents and reviews 12 months of water quality data which are collected monthly from 11 stations with samples processed for inorganic nitrogen, chlorophyll-a and phosphorus. Water column oxygen, salinity and temperature profiles are also captured at each station using a multi-parameter sonde. ADS has also conducted additional sampling for greenhouse gas dynamics and has undertaken numerical modelling of the system’s carrying capacity. ADS provides annual compliance reports for the local government to review and determine if resource consent conditions (compliance) are being met.

ADS Environmental Services was commissioned to conduct a comprehensive Hydraulic and Oil Spill Numerical Modelling study for a proposed 164,000 TPA Oil & Wax Emulsion Manufacturing Plant in Lumut, Perak. This project highlights our capacity to deliver environmental assessments satisfying both Department of Environment (DOE) and Department of Irrigation and Drainage (JPS/DID) requirements while providing our clients with the data necessary for developing emergency response planning.

The study focused on the hydrodynamic complexities of the Manjung and Sitiawan River estuaries, where tidal forces and seasonal monsoons dictate the movement of marine traffic and potential pollutants. Using a flexible mesh grid, we simulated non-steady flow phenomena and water level variations. This identified current velocities of up to 0.40 m sec^-1 at the critical ship-to-shore transfer jetty. We also conducted Lagrangian particle tracking for 70n Base Oil and Heavy Paraffinic Distillate. Unlike standard crude models, these simulations accounted for the specific physical properties of refined wax emulsions. Our model simulations quantified the “weathering” of spills over 24-hour cycles (accounting for processes including evaporation, emulsification, and photooxidation). By analyzing NE, SW, and Inter-Monsoon scenarios, we identified seasonal “impact windows” for sensitive receptors, such as the 90-hectare regional aquaculture network and the Lumut Naval Shipyard.

Macquarie Harbour is a fjord-like estuary located on Tasmania, Australia’s west coast and hosts sea-cage salmonid farms with an annual production of approx. 9,500 tons in 2025. Water quality is monitored monthly by ADS for the salmon companies through the Broadscale Environmental Monitoring Program (BEMP).

The BEMP a regulatory framework designed to track the cumulative environmental impact of salmon farming across the entire Macquarie Harbour ecosystem, rather than just at individual farm sites. ADS collects water quality profiles at 17 sites for parameters such as dissolved oxygen, salinity, temperature, soluble nutrients (ammonia, nitrate, organic carbon, etc), total suspended solids, and phytoplankton. This program is aimed at managing aquaculture impacts and maintaining historical water quality ranges (1993–2010).

ADS have also conducted additional sampling for greenhouse gas production and have undertaken research examining the drivers of dissolved oxygen and nitrous oxide in the system.