CVPPPL/PDHEP/C&P/NIT-184/2021/456 : Diamond Core drilling including driving, ramming of drill holes for lowering of casing of PX, HX & NX for 01 (one) drill hole of (+/-) 60.00 m at kidur Nallah, 01 (one) drill hole of (+/-) 30.00 m at Downstream Coffer Dam location & 01 (one) drill hole of (+/-) 35.00 m at upstream Coffer Dam location including core preservation & water permeability test in all types of strata as per relevant IS codes for Kirthai-II HE Project