Assume that 50,000 yd3of the soil from the borrow pit is to be delivered to an embankment at a construction site. By the time it reaches the site, due to evaporation, the water content is 9%. This soil will be compacted to the maximum dry density. Determine the total amountofwater (inlb) that must be added to the soilto increase the moisture content to the optimum level.

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.