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(2331 M) <br />The working range will be determined by applying plus <br />and minus tolerances to the J.M.F. in accordance with <br />the following: <br />BA-2 BA-2 <br />Sieve Size (1/2" Minus Mixture) (3/4" Minus Mixture BA-3 <br />1-1/2 in. <br />3/4 in. -- -- +g <br />5/8 in. -- +8 +8 <br />1/2 in. -- -- __ <br />3/8 in. +8 +8 +8 <br /># 4 +8 +8 +8 <br /># 10 +8 +8 +g <br /># 40 +7 +7 +7 <br />#200 +3 +3 +3 <br /> The working range shall not exceed the gradation <br /> limits previously established in Section 2331.2A of <br /> this specification. <br />The job-mix formula, as originally established, shall <br />remain in effect until modified in writing. Should a <br />change in source of aggregate be made, or when <br />unsatisfactory results or other conditions make it <br />necessary, the Engineer will establish a new formula <br />based on the test results from a new trial mix <br />submittal. <br />In accordance with Specification 1503, it is the <br />intent of this Specification (2331) that the <br />aggregate materials shall be uniform in character and <br />shall conform as nearly as possible to the middle <br />portion of the working range (J.M.F.) so as to assure <br />that the mixture meets the mixture design criteria. <br />The working range is to accommodate occasional <br />variation from the J.M.F. which are unavoidable for <br />practical reasons. <br />(7) Aggregate samples and/or bituminous mixture samples <br />may be taken at any time during mixture production <br />and/or placement in order to verify compliance with <br />the aggregate and design requirements previously <br />established. <br />-6- <br />