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(2341M) <br />The working range for the No.'s 4 and 200 <br />sieves shall not exceed the specification <br />gradations limits previously established <br />within these specifications. <br />The job-mix formula, as originally <br />established, shall remain in effect until <br />modified in writing. Should a change in <br />source of aggregate be made, or when <br />unsatisfactory results or other conditions <br />make it necessary, the Engineer will <br />establish a new formula based on the test <br />results from a new trial mix submittal. <br />in accordance with Specification 1503, it is <br />the intent of this Specification (2341) that <br />the aggregate materials shall be uniform in <br />character and shall conform as nearly as <br />possible to the middle portion of the working <br />range (J.M.F.). The working range is to <br />accommodate occasional variation from the <br />J.M.F. which are unavoidable for practical <br />reasons. <br />(6) Aggregate samples and/or bituminous mixture <br />samples may be taken at any time during <br />mixture production and/or placement in order <br />to verify compliance with the aggregate and <br />mix design requirements previously <br />established. <br />-5- <br />