Chemical Requirements: The rock salt shall conform to a chemical composition of a minimum of 95.0 percent Sodium Chloride with no variations. Physical Requirements: The gradation when tested by means of laboratory sieves shall conform to the following requirements for particle size without and variations: Sieve Size Percentage Passing by Weight 1/2 inch 100 3/8 inch 95-100 No. 4 20-90 No. 8 10-60 No. 30 0-15 Moisture Content: The moisture content of the sodium chloride at the time of delivery shall be .5% or less, sodium chloride delivered with higher moisture content may be accepted with a reduction of 1% from the total weight of the sodium chloride on that load or loads. Sodium chloride delivered with a moisture content higher than 2.5% will be reject unless emergency conditions exist whereby the City of Brewer/Bangor may at its discretion elect to keep the product. Treatment: In order to prevent caking while in storage following a delivery, all sodium chloride shall be uniformly treated with and an anti-caking conditioner (YPS or equal). The conditioner shall be applied to the sodium chloride at the rate which when sampled shall have a minimum of 10 parts per million (PPM) and a maximum of (50 PPM), the use of a colored conditioner is preferred.
