The most recent edition is the MMCD 2019 Edition.
GC2.2(1) shows the hierarchy of documents
Article 4.4.6 in the Volume I User Guide discusses Force Account reporting. Daily report formats are often established at the pre-job meeting.
The Contract Administrator is the interpreter of the Contract Documents, and the judge both parties to the Contract (GC 3.6.1). However, there are references in the General Conditions of the MMCD to Extra Work. Extra Work is defined in GC 7.1.3. Extra Work is covered in GC 8.0. The Contractor is invited to perform Extra Work by issuing a Contemplated Change Order or Field Memo.(GC 8.1.1).