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with plant controls so that the mixture production will be interrupted if introduction of the hydrated lime fails . The addition of the hydrated lime to the aggregate may be accomplished by Method (A) or (B ) as follows : 337-9 . 2 . 1 Method (A) - Dry Form : Add hydrated lime in a dry form to the mixture according to the type of asphalt plant being used. When a batch plant is used, add the hydrated lime to the aggregate in the weigh hopper or as approved and directed by the Engineer. Increase the batch dry mixing time by eight to twelve seconds , or as directed by the Engineer, from the time the aggregate is completely emptied into the pugmill . Uniformly distribute the hydrated lime prior to the addition of asphalt rubber into the pugmill . When a drum-mix plant is used, add and uniformly disperse the hydrated lime to the aggregate prior to the addition of the asphalt rubber. Add the hydrated lime in such a manner that it will not become entrained in the exhaust system of the drier or plant. 337-9 .2 .2 Method (B) - Hydrated Lime/Water Slurry : Add the required quantity of hydrated lime (based on dry weight) in a hydrated lime/water slurry form to the aggregate . Provide a solution consisting of hydrated lime and water in concentrations as directed by the Engineer. Use a plant equipped to blend and maintain the hydrated lime in suspension and to mix it with the aggregates uniformly in the proportions specified. 337-9.3 Hydrated Lime Pretreatment : For FC - 5 mixes containing granite , as an alternative to 337 - 9 . 2 , pretreat the aggregate with hydrated lime prior to incorporating the aggregate into the mixture . Use a feed system to accurately proportion the aggregate and required quantity of hydrated lime, and mix them in such a manner that uniform coating of the aggregate is obtained. Control the proportion of hydrated lime to within plus or minus 10 % of the amount required. Aggregate pretreated with hydrated lime in this manner shall be incorporated into the asphalt mixture within 45 days of pretreatment. 337-9 .3 . 1 Hydrated Lime Pretreatment Methods : Pretreat the aggregate using one of the following two methods : Pretreatment Method A — Dry Form : Add the required quantity of hydrated lime in a dry form to the aggregate . Assure that the aggregate at the time of pretreatment contains a minimum of 3 % moisture over saturated surface dry ( SSD) conditions . Utilize equipment to accurately proportion the aggregate and hydrated lime and mix them in such a manner as to provide a uniform coating. Pretreatment Method B — Hydrated Lime/Water Slurry: Add the required quantity of hydrated lime (based on dry weight) in a hydrated lime/water slurry form to the aggregate . Provide a solution consisting of hydrated lime and water in a concentration to provide effective treatment . Use equipment to blend and maintain the hydrated lime in suspension, to accurately proportion the aggregate and hydrated lime/water slurry, and to mix them to provide a uniform coating. 337-9 .3 .2 Blending Quality Control Records : Maintain adequate Quality Control records for the Engineer ' s review for all pretreatment activities . Include as a minimum the following information (for each batch or day ' s run of pretreatment) : pretreatment date, aggregate certification information, certified test results for the hydrated lime , aggregate moisture content prior to blending, as -blended quantities of aggregate and hydrated lime , project number, customer name , and shipping date . 337-9 .3 .3 Certification : In addition to the aggregate certification, provide a certification with each load of material delivered to the HMA plant, that the material has been - 108 - FPID ( S ) : 423186 - 1 - 58 - 01