Specifications include, but are not limited to: The Sodium Chloride shall contain an anti-caking additive uniformly distributed. The additive and the proportion used will be indicated on the manufacturer's bid. 3. All loads shall be covered with a waterproof covering to ensure that deliveries arrive in the Department of P u b l i c W o r k s y ard are in a free-flowing and useable condition. All loads will be subject to visual inspection while unloading. Any shipment deemed to be unusable because of excessive water, oversized material, excessive caking or reduced sodium chloride content may be rejected at the discretion of the Public Works Director. ; shipments of approximately 20 tons, delivered on dump type tractor-trailers. The shipments will be on an "as needed/will call" basis,