laying jointing and testing of hdpe pipes node- a18 to a19-20-21-22 a19 to a23 a20 to a24 a18 to b b-b1-2-3-4 b1 to b5-6 b2 to b7 b- b8-9 d1 to b11 construction of chamber/bp tanksopen chamber 3 nos. and sluice valve chamber 6 nos.
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