DGS represents federal and tribal oil and gas lessees from initial exploration to final reclamation.  We work with a wide range of oil and gas companies in obtaining permits for seismic operations, obtaining and defending oil and gas leases, posting bonds, obtaining approval of permits to drill, and acquiring necessary permits for, among other things, produced water and air emissions.  We assist clients in obtaining BLM approval for federal oil and gas units, frequently counsel clients on unit disputes, and have prosecuted and defended disputes between unit operators and non-operators over issues such as participating areas, drainage, and ownership interests.  After leases are assigned we have acted as both counselor and litigator to companies in disputes over issues of retained liability for royalties and environmental clean up accruing prior to assignment.  For mature oil and gas properties we assist clients in issues such as lease termination, plugging and abandoning wells, and reclamation.