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