The maintenance costs of the garbage dump were Rs. 34 m in 2010, Rs. 54 m in 2012 and Rs. 182 m in 2015.
All the equipment had been rented from a company at Denzil Kobbekaduwa Mawatha in Battaramulla.
Despite having spent such huge amounts to flatten the garbage dump, it collapsed last April, causing loss of life and property.