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prime and/or wearing surface is laid. If at any time during this curing period the base shall be subjected to rainfall and lose its compaction it shall be rescarified, reshaped and recompacted. Thickness determination shall be made as directed by the County Engineer. a� Section (e) Surface Cdurses ; (e.1) Seal Coat. All base courses as specified in Section X 3(d) shall receive a seal coat. The seal coat shall be an application of cut-back asphalt grade RC -1S or other material as specifically approved by the engineer. For lime rock bases the rate of application shall be !a not less than 0.10 gallons per square year. For marl, soil cement, and mixed in place basesxxzk the rate of application shall be not less than 0.15 gallons per square yard. The seal coat G i, shall be applied with a pressure distributor equipped withpneumatic tires having a sufficient width of rubber in contact with the road surface to avoid breaking the bond of or forming a `9 rut in the surfacing. All equipment necessary for the proper construction of this work shall be on the project, in first class working condition, and shall have been approved by the engineer i before the construction is started. A light uniform application of clean sand shall be applied prior to opening the primed base to traffic. The sand shall not contain any noticable amount of roots or other :a foreign material. Before any bituminous material is applied all loose material, dust, dirt, caked clay and foreign material which might prevent proper bond with the existing surface will be moved to the shoulders for the full width of the application. No bituminous material;; shall be applied when the temperature of the air is less than 50 degrees F., or when, in the opinion of the engineer, the weather conditions or the conditions of the existing surface is unsuitable. The temperature of the prime material shall be between 100 degrees F. and 150 degrees F. The exact temperature shall be such as will ensure uniform distribution and shall be designated by the engineer. The exact amount to be applied will be dependent on the character of the surface and will be sufficient to coat the surface thoroughly and uni- formly without having any excess to form folds or to flow off the base. If deemed necessary, the engineer may require that the base be lightly sprinkled with water in advance of the application of the prime. (e.2) Sand Seal Wearing Surface This wearing surface is to be composed of asphalt material grade AC -15 applied in one application and covered with sand cover material applied in a single applica- tion. Such work to be constructed on an existing base with seal coat in accordance with the specifications and in conformity with the lines, grades and cross section of the proposed pavement., The proportion shall be approximately 0.30 gallons of asphalt and 0.30 cubic feet of cover material per square yard. Other bituminous material may be used upon specific approval. The cover material shall be clean sand. The sand shall be practically free from clay, silt, sticks, trash, roots, vegetation and other organic matter, and shall be approved by the engineer before use. 0 1 1 1 40 1 I n L�