BID DOCUMENTS FOR “Working survey, Soil investigation, Design of Underground Drainage project. Work including Providing, Supplying, Lowering Laying, Jointing, Testing & Commissioning of RCC NP3 Pipes for Sewer Collecting System- Gravity Mains, Construction of Inspection Chambers & House Connection for Babra Underground Drainage Project- Phase- II, Work including Operation & maintenance for 12 Months, Taluka: Babra, District: Amreli, Gujarat “