Submission of Contract Documents and Engineer's Cost Estimates to the Commission on Audit. Category: Department OrderSub Category: contracts-contractorsSeries: 1990No: 171File: DO_171_S1990.pdfDate: Thursday, August 30, 1990Tags: Submission Contract Documents Engineer's Cost Estimates Commission Audit contract 171 Read more about Submission of Contract Documents and Engineer's Cost Estimates to the Commission on Audit.