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done when the air temperature is less than 50 <br />degrees F.-, or when, in the opinion of the Engi- <br />neer, the weather conditions or the condition .of <br />the aggregate material is unsuitable. <br />After mixing has been completed the mixture shall <br />be cured until it has reached the proper consis- <br />tency <br />onsistency to be compacted. The mixture shall first be <br />rolled with the roller. The graders shall be used <br />in conjunction with the rollers to keep the mixture,,,_. <br />shaped to approximate plan and cross section. <br />After compaction, the surface shall then be shaped <br />to line, grade and cross section allowing sufficient <br />elevation of the mixture to compensate for final <br />compaction. The mixture shall then be thoroughly <br />rolled with an 8 (eight) ton tandem roller equipped <br />with scrapers and oil sacks on the wheels to prevent <br />picking up the material. <br />E. Prime & Surface Course: <br />1. Prime Coat <br />"All base courses as specified in Section D shall <br />receive a seal coat. The seal coat shall be an <br />application of cutback asphalt grade RC -1S or other <br />material as specifically approved by the Engineer. <br />For lime rock bases the rate of application shall <br />be not less than 0.15 gallons per square yard. The <br />seal coat shall be applied with a pressure distri- <br />butor equipped with pneumatic tires having a suf- <br />ficient width of rubber in contactwith the road <br />surface to avoid breaking the bond of or forming <br />a rut in the surfacing." <br />A light uniform application of clean sand shall be <br />applied prior to opening the primed base to traffic. <br />The sand shall not contain any noticeable amount <br />of roots or other foreign material. <br />Before any bituminous material is applied all loose <br />material, dust, dirt, caked clay and foreign material <br />which might prevent proper bond with the existing <br />surface will be moved to the shoulders for the full <br />width of the application. No bituminous material <br />shall be applied when the temperature of the air <br />is less than 50 degrees F., or when, in the opinion. <br />of the Engineer, the weather conditions or the <br />condition of the existing surface is unsuitable. <br />The temperature of the prime material shall be <br />.7- <br />M R 191975 eooK 22 PAGEIJO <br />