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SECTION 38 l1m~ .1Y41 HOISTURE At tho time of mixing wi t.h the bituminous material, the agl~regate shall not contain morEl than 3% moisture. If an additive is used as a coating aid, it must be approved previous to its use by the engineer and in the event that such additive is used, the aggregate m~y contain moisture up to a maximum of 6')~. SECTION 39 ~EHPERATURE MID TIfI"lE OF OPERATION BitwrUnous mat.erial shall not be applied when the air temperature is less than 500 F. It shall not, be applied when the \veather or roadbed condi hons are unfavorable in the opinion of the engineer. ]Jitur:1Lnous material sha-! 1 be applied only durinG daylicht hours. Under no circumstanees 1,o}'il1 it be permissible to apply any bituminous material which is not mixed at least in a partial manner with the aggregate before dark. SECTION 40 API"LICA'rJON OF ASPHALTIC MATERIAL After the windrovred material has been mixed and dried in a manner satJ sfac- tory to the engineer, the contractor shall apply N. C. 3 cutback asphalt which has been heated to a temperature of not less than 2000 Fahrenheit. Not more than 0.5 gallons per square yard of roadway to be covered vTill be permitted in anyone application. Detween each application of the bituminous material, the aggregate shall be mixed so as to thoroughly distribute the oil through the windrmr throu,~h the use of a Seaman mixer. After the LlSt application, the mixing shall continue until the mixture has become serated, free of surface moisture, and tacky to a degree satisfactory to the engineer. The number and rate of applications shall be a' directed by the engineer. SPHEADING AND ROLLING Aftcr mixing operations ha_vo been completed, the entire mixture shall be spread over the roadway to form the designed cross section in as uniform a manncr as possigle. The entire street shall be rolled after the material h~\s been spread using a roller weighinG eiht toms and traveling at the rate of speed which is slo"\-r enough to assure that the materi&l will not be unduly moved. The surface shall be rolled until t.here is no further compaction and until- all ro11er marks are eliminated. Rolling shall be discontinued whenever it. beLins t.o produce excess crushing or pulverizing of the aggregate or displacement of the mixturo. Sufficient Hater to prevent adhesion of t.he mixture to t.he roller will be permitted but an excess of "\-later must not be used. SF:CTION hI /'"- SECTION 42 GUTTER SECTION The cont.ractor will be required to stabilize the back slope between the bottom of t.he gut.ter and the t.op of the boulevard bc~ and then roll and: tamp this back slope j nto ClacG to form i\ continuous gutter or curb. The amOlmt of oil per square yard and the depth of the material to be t.reated on this back slope shall conform with that used for the driving surface of the street. (9 )