Specifications include, but are not limited to: Trap Rock, Grade B, as defined in Missouri Standard Specifications, Section 1003.2, washed and screened, and meeting the enclosed specifications. Rock to be delivered at the direction of the using department. Indicate the specific gravity in accordance with ASTM C127, and include the certified test report with your bid response. (This is an estimated quanity. City of Columbia reserves the right to add to or subtract from shown quanity). 3/8" X 1/4" Trap Rock - as defined in Missouri Standard Specifications, Section 1003.2, washed and screened, and meeting the enclosed specifications. Rock to be delivered to at the direction of the using department. Indicate the specific gravity in accordance with ASTM C127, and include the certified test report with your bid response. (This is an estimated quanity. City of Columbia reserves the right to add to or subtract from shown quanity). 3/8” Osage River Rock or equal. The specific gravity of the rock shall be 2.433 +.05 and meet ASTM C-33, size #89 Rock (This is an estimated quanity. City of Columbia reserves the right to add to or subtract from shown quanity)."