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CITY OF EVERETT SPECIAL PROVISIONS <br />3rd Ave Water Quality Project Division 4 – BASES September 12, 2024 <br />WO No – UP 3775 SP – 144 <br /> <br />Recycled asphalt pavement (RAP) may be used in the production of ATB. If utilized, the <br />amount of RAP shall not exceed 30 percent of the total weight of the ATB. The final <br />gradation and asphalt binder content will conform to the approved Job Mix Formula <br />(JMF). ATB will be evaluated under Commercial Evaluation as shown in section 9- <br />03.8(7). Va limts under 9-03.8(7) are excluded from ATB evaluation criteria. <br />Mixing <br />The mixer shall be capable of producing a uniform mixture of uniformly coated <br />aggregates meeting the requirements of these Specifications. <br />4-06.3(2) Preparation of Aggregates <br />Aggregates for asphalt treated base shall be stockpiled before use in accordance with <br />the requirements of Section 3-02. <br />The aggregates shall be heated as required by the Engineer. <br />4-06.3(2)A Mix Design <br />The mix design requirements for asphalt treated base shall be as described in <br />Section 5-04.3(7)A. <br />4-06.3(3) Vacant <br />4-06.3(4) Mixing <br />The asphalt treated base shall be mixed in accordance with the requirements of Section <br />5-04.3(8). <br />4-06.3(5) Hauling Equipment <br />Hauling equipment for asphalt treated base shall conform to the requirements of Section <br />5-04.3(2). <br />4-06.3(6) Spreading and Finishing <br />Asphalt treated base shall be spread with a spreading machine equipped with a <br />stationary, vibratory, or oscillating screed or cut-off device, subject to the approval of the <br />Engineer. Approval of the equipment shall be based on a job demonstration that the <br />finished product will meet all requirements of the Specifications. Automatic controls will <br />not be required. Unless otherwise directed by the Engineer, the nominal compacted <br />depth of any ATB layer shall not exceed 0.40 feet. On areas where irregularities or <br />unavoidable obstacles make the use of mechanical spreading and finishing equipment <br />impractical, the paving may be done with other equipment or by hand. <br />The internal temperature of the ATB mixture at the time compaction is achieved shall be <br />a minimum of 185°F. Rollers shall only be operated in the static mode when the internal <br />temperature of the mix is less than 175°F. <br />4-06.3(6)A Subgrade Protection Course <br />Unless otherwise specified by the Engineer, the Contractor shall place the asphalt <br />treated base as a protection for the prepared Subgrade on all sections of individual <br />Roadways which are to receive asphalt treated base as soon as 10,000 square <br />yards of Subgrade is completed. This requirement shall not be limited to contiguous <br />areas on the project. <br />The surface of the Subgrade protection layer when constructed on a grading project <br />shall conform to grade and smoothness requirements that apply to the Subgrade <br />upon which it is placed. <br />4-06.3(6)B Finish Course <br />The final surface course of the asphalt treated base, excluding Shoulders, shall not <br />deviate at any point more than 3/8 inch from the bottom of a 10-foot straightedge