# Critical Study Quality Management for the Anti-Seepage System in Macau's Landfill Area
## 4 Quality Control Plan  
Proposing a Comprehensive Quality Control Plan, including Quality Objectives, Standards, and Processes  
In the landfill anti-seepage system project, a quality control plan is a crucial element to ensure that the project is completed according to expected standards (Figure 6). Here is an overview of a quality control plan for reference:  
* Quality objectives The primary objective of the landfill anti-seepage system project is to ensure that the construction quality aligns with both national and local regulations. By doing so, this will effectively protect the environment and ecosystems surrounding the landfill [19]. To achieve this objective, several specific goals will be pursued. These include ensuring that the seepage layer thickness meets the required criteria, guaranteeing the physical and chemical properties of materials used in the construction are appropriate, designing and implementing an effective drainage system, and evaluating the efficiency of the drainage system in preventing seepage;
* Quality standards To maintain and achieve the desired construction quality, a set of quality standards will be established for the landfill anti-seepage system project. These standards will outline the necessary criteria for the seepage layer thickness. Additionally, they will specify the physical and chemical properties that materials must meet to be considered suitable for use in the construction process [20]. The standards will also dictate the design requirements for the drainage system, such as the placement and spacing of drainage elements, as well as the necessary slope or gradient for efficient water flow. Furthermore, criteria will be set to assess the effectiveness of the drainage system in preventing seepage;
* Quality processes The quality processes for the landfill anti-seepage system project will consist of several stages, each with its own set of activities and objectives;* Initial preparation  
During this stage, comprehensive geological surveys and environmental assessments will be conducted. This process aims to ensure that the project designs take into account all relevant geological and environmental factors that may affect the construction quality. The surveys will identify potential risks, such as unstable soil conditions or sensitive ecological habitats, enabling appropriate measures to be incorporated into the project plan [21];  
* Design phase  
The design phase involves developing detailed engineering designs that specify the technical indicators and quality requirements. These designs will outline the specific construction methods to be followed and provide technical guidelines for the materials and equipment to be used [9]. They will also consider factors such as load-bearing capacity, structural stability, and long-term durability;  
* Pre-construction phase  
During the pre-construction phase, construction plans will be prepared, taking into account the design specifications and technical requirements. This phase also involves procuring the necessary materials, equipment, and personnel to carry out the construction activities effectively. Proper planning and resource allocation are essential to ensure that all required resources are available when needed [22; 23];  
* Construction process  
The construction process will be closely monitored to ensure that every step adheres to the design and quality requirements. Real-time monitoring will enable early detection of any deviations or issues, allowing for prompt corrective actions to be taken. Documentation of the construction process will be maintained for future reference and quality assurance purposes, ensuring that the project is implemented as planned [24; 25];  
* Quality inspections  
Regular quality inspections will be conducted throughout the construction process. These inspections will include material tests to verify their suitability and compliance with quality standards.