bids are invited for trenching in ordinary soil - trenching in ordinary soil up to a depth of 60 cm including removal and stacking of serviceable materials and then disposing of surplus soil, by spreading and neatly levelling within a lead of 50 m and making up the trenched area to proper levels by filling with earth or earth mixed withsludge or / and manure before and after flooding trench with water (excluding cost of imported earth, sludge or manure). , supplying and stacking of good earth at site - supplying and stacking of good earth at site including royalty and carriage upto 5 km lead complete (earth measured in stacks will be reduced by 20% for payment) , supplying and stacking sludge at site - supplying and stacking sludge at site including royalty and carriage upto 5 km lead complete (sludge measured in stacks will be reduced by 8% for payment) , supplying and stacking at site dump manure - supplying and stacking at site dump manure from approved source,including carriage upto 5 km lead complete (manure measured in stackswill be reduced by 8% for payment) :screened through sieve of i.s. designation 20 mm , fine dressing of the ground. - fine dressing of the ground. , spreading of sludge, dump manure - spreading of sludge, dump manure and/or good earth in required thickness as per direction of officer-in-charge (cost of sludge, dump manure and/ or good earth to be paid separately). , mixing earth and sludge or manure - mixing earth and sludge or manure in the required proportion specified or directed by the officer-in-charge , preparation of beds for hedging and shrubbery - preparation of beds for hedging and shrubbery by excavating 60 cm deep and trenching the excavated base to a further depth of 30 cm, refilling the excavated earth after breaking clods and mixing with sludge or manure in the ratio of 8:1 (8 parts of stacked volume of earth after reduction by 20% : one part of stacked volume of sludge or manure after reduction by 8%), flooding with water,