THE STUDY OF SEPTIC TANK EMPTYING STRATEGY IN URBAN AREAS CASE STUDY OF PADANG CITY, WEST SUMATRA. LJEE [Internet]. 2026 Feb. 25 [cited 2026 Oct. 18];6(2):1-17. Available from: https://journal.ar-raniry.ac.id/index.php/lingkar/article/view/8686