The subbase for concrete surfaces shall be sprinkled just before placing the concrete. Joints and surfaces shall be made to match the original surface. The thickness of concrete shall be equal to the adjacent concrete but in no case less than six inches (6") thick. The mixing, cement, water content, proportion, placement and curing of the concrete will be approved by the public works director or his designee. In no case shall the concrete have less comprehensive strength than three thousand (3,000) pounds per square inch at the end of twenty eight (28) days. (Ord. 2006-18, 2006)