Specifications include, but are not limited to: Furnish all materials, labor and equipment necessary to sand blast exterior of each filter, remove and dispose of the existing filter media and clean the interior of the two (2) Horizontal Pressure Filter tanks and install the new filter media. Each tank is 8 feet in diameter and 25 feet in length. The filter media consists of new layers of gravel and one (1) layer of sand. The works shall also include the installation of three (3) 30-inch Slip On Flange Manway Hatches and cover, six (6) handhole patch repairs, and the removal and replacement of all stainless steel bolts, nuts, washers and gaskets on two (2) existing manway hatches, new exterior paint for each tank including all labor, material and equipment necessary.