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t iMIWI ION 4J �IIIII-I # k' 5� aws ^' ' z r. - �tS`3` �r? s'm `r ,✓ _ A q ,c tixuk a'h..*,.` :r n... "`" k'`?r ✓ ,. .�'. 4 . c �` t, �'k zsm z y a ARTICLE 234 - 8 (Pages 220 - 221 ) is deleted and the following substituted : 234-8 Thickness Requirements . 234-8 . 1 General : The total thickness of the Type B asphalt layers will be the plan thickness as shown in the Contract Documents . Before paving, propose a thickness for each individual layer meeting the requirements of this specification, which when combined with other layers (as applicable) will equal the plan thickness . For construction purposes , the plan thickness and individual layer thickness will be converted to spread rate based on the maximum specific gravity of the asphalt mix being used, as well as the minimum density level, as shown in the following equation : Spread rate (lbs . per square yard) = It x Gmm x 43 . 3 Where : It = Thickness (in . ) (Plan thickness or individual layer thickness) Gmm = Maximum specific gravity from the verified mix design The weight of the mixture shall be determined as provided in 320 -2 . 2 . For target purposes only, spread rate calculations should be rounded to the nearest whole number. 234-8 .2 Spread Rate Tolerance : Control the average spread rate on a daily basis to within plus or minus 5 % of the target spread rate for the individual layer(s) established by the Engineer. When the average daily spread rate is outside this tolerance from the target, adjust the spread rate to the required value established by the Engineer. The Engineer will periodically verify the spread rate at the job site during the paving operation . I: lee 234-8 .3 Allowable Deficiencies : The Engineer will allow a maximum deficiency from the specified spread rate for the total thickness as follows : 1 . For pavement of a specified thickness of 2 - 1 /2 inches or more : 50 lbs . per square yard. 2 . For pavement of a specified thickness of less than 2 - 1 /2 inches : 25 lbs . per square yard . 234- 8.4 Pavement Exceeding Allowable Deficiency in Spread Rate : Where theININ deficiency in spread rate for the total thickness is : ( 1 ) in excess of 50 lbs . per square yard for pavements with a specified thickness of 24 /2 inches or more , or (2) in excess of 25 lbs . per square yard for pavements with a specified thickness of less than 24 /2 inches , the Engineer may require removal and replacement at no cost or may require a correction as specified in 234 - 8 . 5 . The Engineer may require the Contractor to core the pavement for thickness in order to determine the area of pavement with deficient thickness . As an exception to the above , the Contractor may leave pavement outside the Ile main roadway in place without compensation when the Engineer allows , even though the IN deficiency exceeds the tolerance as specified above . The Department will not compensate the Contractor for any pavement removed or IN NI for the work of removing such pavement. 234-8 .5 Correcting Deficiency by Adding New Surface Material : In the event the total thickness as determined by the spread rate is excessively deficient as defined above and if approved by the Engineer for each particular location, correct the deficient thickness by adding new surface material and compacting it using a rolling pattern as approved by the Engineer. The Engineer will determine the area to be corrected and the thickness of new material added . Perform all overlaying and compacting at no expense to the Department . - 60 - FPID ( S ) : 423186 - 1 - 58 - 01 r " , �. -a^ "fir s t r rua. `,, . ea �`.k..Gr ;• + � � �r # - a p�'ni r b., _ ,„ y . k ,, zxga, , ° -