Dear Mr.Chen Ove Arup & Partners (HK) are currently working for a site formation project in Hong Kong which involves excavation of 0.5 million cubic meters of hard granite. As the site is near to the residential area, we are planing to use chemical non-exposive demolition agent for rock excavation. We have several questions: 1. How many non-exposive demonlition agent should we use in order to excavate 0.5 million cubic meters of rock. 3. Is it possible to excavate 0.5 million cubic meters of rock using chemical demonlition agent within 1 year.