tender for earth work excavation and depositing on bank with initial lead of 10 m and lift of 2 m in narrow trenches for laying of pipes for water supply in the hard stiff clay, stiff black cotton, hard red earth, shales, murram gravel, stoney earth and earth mixed with small size boulders and hard gravelly soil. , supplying hdpe pipes and spls including all cost and conveyance and labour charges etc complete as per std specification , 110 mm pn 6 hdpe pipe , 110mm hdpe tee , 110mm hdpe bend , 110mm hdpe endcap , 110mm hdpe stepend , lowering hdpe pipes to trench and laying to proper grade and alignment jointing with hdpe couplers with cement paste , testing of hdpe pipes with hydraulic testing equipment by filling with water and testing to recommended pressure in convenient stretches and attending the bursts if any occurred during the test , replacement of damaged portion of existing under ground drainage (the rate including the cost of pvc pipe & spls, labour cost) , jointing hdpe pipes and specials by butt fusion welding / electro fusion welding joints using fusion equipment as per iso 21307-2011 and as per is 7634 (part-2) : 2012 including cost of hire charges for butt fusion equipment power supply arrangements etc., complete as per directed by twad board officers. , labour charges for linking arrangements. , refilling the trench with excavated earth including all cost and labour charges etc complete 25mm 3way ball valve