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place concrete when the ambient temperature exceeds 95 degrees Fahrenheit, when the concrete temperature at the point of placement exceeds 90 degrees Fahrenheit, or when the evaporation rate calculated from ACI 305 exceeds 0.2 pounds per square foot per hour, unless the Contractor submits and the Engineer accepts a written hot weather…placement plan for that pour. Placement between the hours of 10:00 and 16:00 during June through September shall be assumed to require such a plan

written hot weather placement plan is required for this pour and must be submitted not less than five business days before placement, not 48 hours. An evaporation retarder alone does not satisfy the requirement. The plan shall address concrete temperature at the point of placement, timing of the pour, fogging

Ambient temperature at start of placement 88 degrees Fahrenheit rising to 93 degrees Fahrenheit at 14:00. Concrete temperature at the point of placement measured between 84 and 89 degrees Fahrenheit across nine trucks. Calculated evaporation rate reached 0.21 pounds per square foot per hour between…written hot weather placement plan dated six business days before placement was on site and was followed, including fogging and immediate application of curing

Fahrenheit with an anticipated evaporation rate of 0.22 pounds per square foot per hour at midday. Specification 03 30 00 paragraph 3.05 requires a written hot weather placement plan where the evaporation rate exceeds 0.2. Confirm whether a plan submitted 48 hours before placement is acceptable, and whether an evaporation retarder alone