SK ecoengineering

SK ecoengineering conducts environmental audits at least once a year for all business sites to prevent environmental risks that may occur during business operations. Based on a checklist consisting of 112 items, we identify non-conformities, implement corrective measures, and establish monitoring plans to prevent recurrence. In 2025, we conducted a total of 3 environmental audits at approximately 3 domestic business sites, and completed improvements for all 11 identified risks.

1. This is part of the environmental audit Checklist

SK ecoengineering conducts monthly environmental risk assessments to comply with environmental laws and regulations, through which we identify potential environmental risks by sector and establish and implement action plans. Beyond regulatory compliance, we actively prepare mitigation measures to minimize the negative impacts that our business activities may have on the surrounding environment, including air, soil, water quality, and biodiversity. In particular, in 2024, through risk analysis by environmental impact factors, we identified unauthorized discharge and environmental regulation violations as major risks. Each risk is classified by severity according to its impact level on the local community, and we establish and implement response measures for each environmental impact factor considering the potential financial impact on the company.

SK ecoengineering promptly implements improvement measures according to the business site environmental risk response process when environmental regulation non-compliance occurs. Issues that arise are reported to the CEO and responsible executives, and after cause analysis, recurrence prevention measures are established and disseminated to related sites and business offices. Subsequently, we continuously monitor regulatory compliance through staff training, provision of environmental management guides by work type and pollution source, and regular and special inspections led by headquarters. In 2024, we achieved zero environmental regulation violations by performing early project support and periodic thematic inspections (waste, fugitive dust, noise and vibration, etc.). Additionally, we have established guidelines for environmental accident prevention and emergency response for all domestic and overseas business sites, and conduct emergency response training annually. In case of accidents, we immediately block pollution spread through emergency reporting and rapid response, and prevent secondary damage through pollution removal and recovery work after the situation ends.

SK ecoengineering thoroughly reviews legal risks that may arise from business activities to comply with major domestic and international environmental laws and regulations. To systematically manage risks, environmental regulation violation levels are classified into 'major violations' and 'general violations' according to severity, and we strictly comply with domestic and international environmental regulations based on our environmental management policy. As a result, we have had zero environmental regulation violations since our finding ¹⁾

1. Based on fines and penalties of KRW 10 million or $10,000 or more.

SK ecoengineering aims to maintain 'Zero Major Environmental Regulation Violations' in 2026 based on systematic environmental management processes. To this end, we continuously monitor environmental laws and regulations related to business activities and publish compliance management reports every two weeks to share information such as legal amendments, legislative notices, and Ministry of Environment press releases with all project sites. In particular, when laws are amended, we share related information with all projects and respond through contractor training, e-Guide updates, thematic special inspections, and operation of consultative bodies between headquarters organizations.

1. Based on fines and penalties of KRW 10 million or $10,000 or more.

SK ecoengineering enhances employees' environmental awareness by providing educational content for acquiring professional knowledge related to the environment, such as carbon neutrality, hydrogen, circular economy, energy solutions, and construction site environmental management, through SK Group's educational platform mySUNI. We plan to continue developing various environmental education content and providing it to employees to respond to climate change and environmental issues.

1. Ratio of participating employees divided by the number of eligible employees at the time of training implementation.
2. Per-person training performance is calculated by dividing training performance by the total number of employees (as of December 31, 2025).

SK ecoengineering has set waste generation intensity as a key indicator to reduce waste generation and systematically manages performance against targets annually. Reduction targets are calculated based on the average waste generation intensity of the previous three years to maintain a continuous reduction trend. To achieve targets, we are promoting various reduction activities such as resource efficiency and recycling expansion within business sites. The 2025 waste generation intensity target was 7.61 tons/100 million KRW, and the actual performance was 9.15 tons/100 million KRW.

SK ecoengineering monitors the status of compliance with legal standards and health and safety requirements for hazardous substances that may occur at directly operated business sites ¹⁾. At civil engineering and underground excavation sites, wastewater treatment facilities are installed to treat wastewater within discharge standards, and at Batch Plant and Crusher operation sites, air pollution reduction facilities are installed to manage air pollutants below legal standards. Among SK Ecoplant's directly operated business sites, there are no discharge and prevention facilities under the Clean Air Conservation Act and Water Environment Conservation Act.

1. Among SK Eco Engineering's directly operated business sites, there are no discharge and prevention facilities under
   the Clean Air Conservation Act and Water Environment Conservation Act.

SK ecoengineering operates inspection processes and monitoring systems to manage individual environmental hazard factors such as waste, water quality, and air pollutants. Using the 'Environmental Management Implementation Inspection Checklist,' we conduct inspections by item including project systems, permits, operational management, and prevention and suppression facilities. We have also developed a 'Site Environmental Issue-Focused Management Standard Model' for each site to independently inspect environmental issues. In particular, we are strengthening periodic inspections of major processes, focusing on six non-conformity items including turbid water discharge, cleaning wastewater leakage, waste treatment violations, and fugitive dust generation.

1. Tele-Monitoring System

SK ecoengineering has established and operates a systematic management system for environmental hazard factors that may occur at construction sites. For areas with high residential density near business sites and areas where complaints are expected, we have established special management systems to proactively respond and prevent conflicts with local communities in advance. We operate IT system-based continuous site monitoring and technical support systems to do our best in preventing environmental accidents.

1. S.CON : Smart Construction Platform