Specifications include, but are not limited to: All box culvert, storm sewer, duct bank, waterline and sanitary sewer excavation under proposed pavement shall be sand filled and flushed (jetted and vibrated) per City Standard Specifications (section 801), unless flowable fill or other improved backfill material is otherwise specified. The sand fill shall start at the top of improved bedding and be brought up uniformly to an elevation 12 inches above the top of pipe, or 2 feet below the bottom of proposed pavement, whichever is higher. However, in no instance shall the sand fill be brought up to less than 6 inches below the pavement subbase material. Storm sewer adjacent to the back of curb and sanitary sewer in front and side lots shall also be sand filled per this provision, to within 2 feet of final grade. Materials to be used for geogrid reinforced base construction shall consist of virgin crushed stone, recycled Portland cement concrete, or a blend of recycled Portland cement concrete and Reclaimed Asphalt Pavement (RAP). This blend is not to exceed 50% RAP and shall be tested by use of an asphalt burn off oven to ensure compliance.
