Formulation of Solutions for Illegal Temporary Waste Disposal (TWD) Sites Management through Spatial Approach in Bandar Lampung City

Illegal temporary waste disposal (TWD) sites represent a critical challenge in Indonesian cities, driven by inadequate waste management infrastructure. This study develops an integrated GIS-based methodology for identifying illegal TWD sites and formulating evidence-based solutions in Sukarame Sub-district, Bandar Lampung City. Comprehensive field surveys across the 1,771-hectare area documented GPS coordinates and volumes of illegal TWD sites, followed by spatial analysis using overlay and buffer techniques to identify service gaps and evaluate optimal facility locations. Results identified 19 illegal TWD sites containing approximately 129 m3 of waste, with only one legal facility serving the entire sub-district (ratio 1:19). Spatial clustering analysis revealed highest concentrations in Korpri Raya, Sukarame, and Way Dadi Baru villages (5 sites each), while Korpri Jaya village with private collection services had zero illegal sites. Key influencing factors include land use patterns, population density, inadequate government services, and accessibility. The research proposes a dual-strategy solution framework: (1) service enhancement through 20 additional motorized carts to improve collection coverage, and (2) strategic infrastructure expansion with 9 new TWD facilities positioned using 500 m service radius optimization to ensure comprehensive sub-district coverage. This integrated approach advances beyond conventional problem-identification studies by providing actionable, spatially-justified recommendations that address both service delivery and facility placement. The methodology offers a replicable framework for evidence-based waste management planning applicable to other Indonesian cities facing similar urban waste challenges.