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Medical waste poses serious threat to the environmental health without comprehensive guidelines and efficient management as it contains highly toxic chemicals, pathogenic viruses and bacteria. Therefore, proper handling of medical waste with specialised treatment from its source to final disposal has been a primary concern among medical institute, public and private agencies. The existing medical waste classification in many countries does not contain clear and appropriate segregation, which has created confusion among the medical staff in handling medical waste. It is pertinent to mention that, World Health Organisation (WHO) guidance recommends different countries to conduct assessments prior to any decision-making process and improve their own guidelines incorporated with recent technologies. Therefore, the objectives of this research are: 1) to develop a new classification of medical wastes by identifying the gaps in the current classes and 2) to suggest colour code for the medical waste segregation that is adopted from the WHO's colour code with few amendments as per the recent technological development. Due to the challenge in managing medical waste, there is an urgent need in developing and adopting comprehensive medical waste segregation classification to separate the medical waste at the source itself. The methodology of classification is aimed at applying a source separation practiced by the medical personnel on the spot and given them awareness on the segregation process. The proposed new classification of medical waste is based on Malaysia's Scheduled Waste Regulations together with European Waste Code. By extracting the best classification from these two regulations and by overcoming the lacuna in them, a new classification is developed for current use. The developed medical waste classification and its colour codes must provide a better segregation and achieve cost saving at waste disposal. The current methods of classification could be extended to research on application of such classification to other parts of the world. Article DOI: https://dx.doi.org/10.20319/lijhls.2017.32.293304 This work is licensed under the Creative Commons Attribution-Non-commercial 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc/4.0/ or send a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.

Problem Statement: In general, the drinking water systems sourced from ground water (GW) contains chemi- cals at double the current maximum contaminant levels (MCL) of colloids. However, due to increasing demand of water, groundwater may be subjected to over-exploitation and the natural equilibrium is thus disturbed. A steady-state condition is established between seawater and freshwater in a coastal aquifer. This results in aggressive groundwater-surface water interaction, which may even reach the inland aquifer. Approach: The objectives of this research are to determine the level of contamination of groundwater by seawater intrusion and to identify its hazard. A flow model is created using the study area, Kanchong Darat in state of Selangor in West Malaysia in Visual MODFLOW environment. By a transient-state analysis the environmental impact due to groundwater pumping has been studied and the results of are obtained. Conclusion: The simulation results revealed that GW would get lower, and finally the interface between fresh and saltwa- ter could gradually move inland if the abstraction of GW is continued and become over-exploited. In the model the draw- down (DD) at the top most aquifer (depth of 55 m) has been found with a depression cone of radii around 3650 m after 1 day of pumping; the radii reached 7500 m with depth of DD 55.5 m after 10 days, while after 30 days of pumping; it reached about 10 km with DD 56.8m. These models are useful for better water resource management and to understand the coastal hazards into inland resources wherein 75% of the water resource is based on groundwater system.