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1 • 0 1 40 Hubbard -Field stability test. The asphaltic concrete mixture shall be dumped into an approved mechanical spreader and immediately spread and struck off to the full width required and to such an appropriate loose depth for each successive course that .when the work is completed the weight of the mixture required or specific thickness per square yard will be secured. An excess amount of mixture shall be carried ahead of the machine at all times. Hand raking shall be done behind the machine as required. In no case shall the mixture be laid while rain] is falling or when there is water on the surface to be covered. The temperature of the mix - tuee at the time of spreading shall be between 250 and 340 degrees F. No skin patching shall be dune. Irregularities shall be cut to the full depth of the layer and replaced with fresh mixture. After spreading the mixture, it shall be rolled when it has set sufficiently or come to the proper condition to be rolled. Rolling shall begin at the sides and progress toward the center parallel to the center line of the roadway. The roller shall be of the 5 to 10 ton tandem type. The motiontof the roller shall at all times be slow enough to avoid dis- placement of the mixture. To prevent adhesion of the mixture to the roller, the wheels shall be kept properly moistened, but an excess of water shall not be used. The mixture after compaction, shall be of the thickness required in Section A. All places damaged by deposit of gasoline or oil shall be removed and replaced as directed by the engineer. Longitudinal joints along the center line of the pavement are permissible. 4. The construction and completion in a finished condition of all drainage and i 0 drainage structures in accordance with the specifications of the County which are as follows: (a) Swale ditches shall be located 42 feet center to center in 70' right of way. (b) All swale ditches on both sides of all roadways shall be seeded, sprigged or sodded with an approved type grass from the area within one foot of the roadway constructed fo travelway outward to the top of the swale ditch on the outside, all to be done, completed and finished after completion of the finished grading. (c) All driveways leading from the travelway portion of any roadway shall be paved or surfaced, conforming to the drainage swale profile or drainage pipe of sufficient size �' which shall be placed underneath each driveway in the drainage swale to permit proper drainage.) 'I The minimum size of drainage pipe in a roadway Swale shall be 8 inches. (d) If deep ditches are located in or alongside roadways, they shall be of a suff- icient distance from the travelway portion of the road in order to maintain a natural and gradual side slope and an adequate width for shoulders for the travelway. Minimum shoulder width is 5 feet. (e) All culverts placed under roadways shall have rip rap or concrete block head- walls. All swale ditches at the intersection of deeper drainage ditches shall have a culvert pipe, concrete Swale, rip rap or headwall, as the case may be, to prevent washouts and erosion. Culverts in swales shall have fill over pipe stabilized or have rip rap to prevent erosion. i, (f) All back lot drainage ditches shall be dug with a minimum 2 foot wide bottom i d; and a one to one side slope. r i° 'I gd