Specifications include, but are not limited to: Concrete will be ordered by quantity, class, slump, additives (if any) and required delivery time. The supplier must advise the buyer if delivery can not be provided as requested. Concrete will be ordered in quantities of .5 cubic yard or great for delivery between 7 a.m. and 5 p.m. Monday through Friday except for emergencies or prior arrangements. 1) The water/cement ratio shall be calculated by using the following equation: W/C=Water/(Cement + Fly Ash) The water actually used is determined by the water measured into the batch plus the free water on the wet aggregate minus the water absorbed by dry aggregate plus water in any admixture solutions and shall not exceed the limit specified. 2) A specified concrete slump to be delivered to the site shall be ordered by a city representative that is within the range in Table 1 for the class ordered. A minimal amount of water may be added once on site to achieve the needed slump for the work to be performed. Water shall not be added in large amounts to achieve the slump ordered. 3) Compressive strength shall be based on the average of three test cylinders.