KAJIAN PROGRAM PENGELOLAAN AIR LIMBAH PERKOTAAN STUDI KASUS PENGELOLAAN IPAL MARGASARI BALIKPAPAN (Study on Urban Wastewater Management Program A Case Study at WWTP Margasari Management of Balikpapan City, Indonesia) - Nelwan, Freddy (Pusat Studi Lingkungan Hidup Universitas Gadjah Mada, 2015)