Specifications include, but are not limited to: The various City Departments will assign work to the contractor on a project by project basis. Contractor estimates, invoicing and payments, scheduling and reporting will all be done by project. For a given project, the total quantity of work completed for a particular work item will determine the unit pricing to be used for that item. Placement of cement stabilized sand shall be in 8-inch-thick lifts and to be compact to 95% of ASTM D558 unless other specified by the engineer. Compaction shall continue until the entire depth of the mixture is uniformly compacted. • Compaction shall be within four (4) hours of the addition of water to the dry mixed material. • Cement stabilized sand shall not be placed or compacted in standing or free water. • Material will be delivered in tandem or trailer trucks. Any material left in stockpile after four (4) hours should be discarded.