Requesting approval of Supplemental Agreement No. 4 to Work Authorization No. 2 for the Professional Engineering Services, (C-HCDD1-18-036-08-14), with Halff Associates, Inc., for the feasibility study for the Delta Region Water Management Project, to reflect a revised Exhibit "D-1"- Contract Rates, to reflect an increase in the amount of $132,000.00 for Governmental Liaison Services. (Subject to final legal review and compliance with HB1295)