adapter 60 f shown provides support of three sides of the cover 30 d no support is provided along the rear side of the cover a wearing course adapter extension 64 f raises the elevation of the rim extension 44 c to that of the wearing course it will be noted that the presence of raised step 62 f 2 adjacent to the wearing course extension 64 f allows an integral structural connection between the components of the wearing course adapter 60 f and further allows the wearing course adapter to be cast of a homogeneous material it will be further noted that the placement of rim 40 c wearing course adapter 60 f and cover 30 d may be advantageous even in areas which receive the wearing course of asphalt immediately as removal of the wearing course adapter 60 f will facilitate the milling of the wearing course should the municipality or developer decide to remove and replace the wearing course similarly installation of a wearing course adapter on manholes and other structures within the pavement will eliminate time and expense when the pavement is renovated by milling and replacing the wearing course over time the pavement surface is typically repaired a number of times it may become necessary to place an asphalt overlay over existing paving concrete asphalt etc which is nearing the end of its serviceability fig1 shows the installation of an.