earth covering on the exposed ash surface to supress ash blowing in the ash pond , earth covering over exposed ash earthwork in over area filling for covering of exposed ash surface inside ash pond of average thickness of 50mm . the earth shall be borrowed from out side nalcos acquired land boundary , transportation to workplace and shall be spreaded over the exposed ash surface of average thickness of 50mm as directed by mic . the rate shall include excavation of earth at borrow area , transportation , stacking , drying if required , spreading in required thickness , royalty , all materials , tools , tackles and machinery . all temporary approach roads at borrow area and filling area shall be made by the bidder at his own cost . the measurement shall be made in square meter and no deduction shall be made for voids .