The purpose of this Combined Synopsis/Solicitation is for the 21st Civil Engineering Squadron for the supply and delivery of angular riprap stone. AMENDMENT 01 – The purpose of this amendment is to in... The purpose of this Combined Synopsis/Solicitation is for the 21st Civil Engineering Squadron for the supply and delivery of angular riprap stone. AMENDMENT 01 – The purpose of this amendment is to incorporate questions with answers, include certified scale and delivery ticket requirements, and extend the solicitation due date. All changes to this solicitation have been highlighted on the Combo document.