Additional work orders were made without a change in the scope of work for the contract on a lump sum project. Insurance charges reimbursed contrary to contractual agreement. Insurance certificate not on file. Expired performance bond. Significant rework in the field of vendor equipment without corresponding backcharge. Purchasing function not separated from receiving. Non-approved subcontractors. Expired contractor insurance. Subcontracts/purchase orders not written. Purchase bids and/or quotes not obtained for purchases over the value established in the contract. Purchase requisitions not approved. Purchase requisitioner bypassed purchasing. Sole-source purchasing not justified or approved at proper level.