Amendment Request
ATTACHMENT B
MWH Constructors, Inc.
391 N. Main St., #110
Corona, CA 92878
AMENDMENT NO. 6
Professional Services Agreement A9141
Digester No. 2 Project – Construction Management & Inspection Support City of Palm Springs
1. Purpose of Amendment
Amendment No. 6 is requested to provide continued Construction Management (CM) and inspection services for the Digester No. 2 project (PSA A9141) through March 2026. Current contract funds will be fully exhausted at the end of October 2025, and the project duration has extended beyond the forecast used for Amendment No. 4 due to permitting delays, design coordination, Gas Holder–related changes, and SCADA integration requirements. The contractor’s latest schedule (data date September 1, 2025) shows a Contract Completion date of January 26, 2026. The system startup timeline remains TBD pending Gas Holder integration and coordination.
2. Scope of Services Included in Amendment No. 6
MWH will continue to provide CM and inspection support from November 2025 through March 2026, including:
• Construction Management Services:
• Oversight of remaining construction activities associated with Digester No. 2 and Gas Holder–related changes
• Coordination and monitoring of SCADA integration work • Review of contractor submittals, RFIs, and field directives • Review and processing of the contractor’s upcoming Time Impact Analysis (TIA) • Attendance at progress and technical coordination meetings • Project controls support, including schedule monitoring and pay application review • Inspection Services:
• Field inspection for Gas Holder–related installation modifications • Inspection of SCADA and electrical integration work
• Mechanical system testing and verification
• Punch list verification and corrective work documentation • Daily Inspection Reports and Procore documentation
• Closeout Support:
• Review of O&M manuals, training documentation, and as-builts • Final inspection and punch list verification
• Participation in startup/commissioning coordination once Gas Holder timeline is confirmed MWH Constructors, Inc.
391 N. Main St., #110
Corona, CA 92878
3. Level of Effort and Fee
The total amendment amount is $18,340, allocated as follows:
• Construction Manager (70% allocation): $12,838 at $197/hr (≈65.2 hours) • Inspector (30% allocation): $5,502 at $180/hr (≈30.6 hours) Total Not-to-Exceed Amount: $18,340
4. Contract Time
Amendment #5 ex tends MWH’s period of performance through March 31, 2026.
5. Justification
This amendment is required to ensure uninterrupted CM and inspection coverage through the extended construction period. Without Amendment No. 6, MWH services will conclude at the end of October 2025, resulting in a gap in oversight for critical remaining work, including Gas Holder coordination, SCADA integration, system startup (TBD), and project closeout.
Sincerely,
Michael Dietrick, CCM, RCI, ICC
Regional Manager
MWH Construction Management Services
MWH Constructors, Inc.
391 N. Main St. Suite 110, Corona, CA 92878
www.mwhconstrutors.com