Contract Modifications

Contracting Officer (CO), Contracting Officer Representative (COR) Construction Management Representative (CMR), or Project Manager (PM)

  • Identify potential changes through discussions with COR, Construction Contractor, Suppliers, Designers, Park Staff, and other appropriate sources.
  • Research potential change to determine if change qualifies as a modification and gain concurrence from COR.
  • Determine if potential change will impact project schedule.
  • Draft Request for Proposal (RFP).
  • Attach required drawings, specifications and related information. Submit to COR for review. With CO's concurrence, COR will issue RFP. Track RFP status with RFP Log.
  • Prepare Modification Estimate of Cost (CM-5). Forward to COR for review.
  • Forward comments on time impacts and recommendation for time extension (change must affect critical path) to COR for review. Consider time impacts when preparing independent Government estimate.
  • Use Architect-Engineer (A/E) Designer, as needed, for assistance in pricing unique, highly technical, or complex materials or equipment. Coordinate use and authorization with COR.
  • Prepare and forward modification package to COR. Ensure COR has Construction Modifications (CM-4) (Attach required drawings, specifications and related attachments.)
  • Include the following backup:
    • CO Directives
    • RFP
    • Government Estimate
    • Construction Contractor's Proposal
  • Enter information on Modification Log. Update log as modification is processed.


  • 2.5.1A United States Army Corps of Engineers (USACE) - Engineer Pamphlets (EP) 1110-1-8
    • Click EP 1110-1-8 (Pub Number column). After the PDF portfolio opens, double-click the appropriate region to open the corresponding Construction Equipment Ownership and Operating Expense Schedule for pricing information.



Last updated: November 19, 2020

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