providing sewage treatment plants (stps) at the locations of 1) asr nagar( 0.20 mld) in gvmc ulb, 2) atchaulova (2.00 mld) in gvmc ulb 3) narsipatnam (0.90 mld) in narsipatnam ulb and 4)yelamanchili (0.10 mld) in yelamanchili ulb (total 3.30 mld) in visakhapatnam district of deputy chief technical officer, visakhapatnam circle, aptidco, developed affordable housing projects in andhra pradesh on design, engineering, construction, supply, installation, testing, erection and commissioning and thereafter operate and maintain the stps for 5 (five) years basis (including defect liability period of two years from the date of completion of project).