Gurugram, Feb. 25 -- The Gurugram Metropolitan Development Authority (GMDA) on Tuesday floated a tender for laying 10 km of master sewer lines worth Rs.31 crore from sectors 77 to 80, officials said. Residents told HT that the lack of master sewage lines has been a major obstacle, forcing them to depend on tractor trolleys to dispose of treated water. Pravin Malik, president of Rising Homes society in Sector 92, said, "Thousands of residents living in developing sectors are suffering due to delay in laying master sewage lines... The RWAs are dependent on tankers to dispose the treated water. It is a difficult situation as costs run high and waste water is also causing pollution in the area." "Around 10 kilometres of sewer lines will be laid in these sectors at an estimated cost of Rs.31.20 crore," said a GMDA spokesperson. GMDA is also laying pipelines from sectors 68 to 76 and 105 to 115, expanding STPs in Behrampur and Dhanwapur by 100 MLD each, and planning new STPs in Sector 107 and Naurangpur. Work will be completed a year after the tender is awarded....