CITY OF PACIFICA
COUNCIL AGENDA SUMMARY REPORT
9/28/2026
1 SUBJECT:
Resolution Authorizing Amendment 1, Task Order 4 and Task Order 5 with DHI Water and Environment Inc. for consulting services in the amount of $54,560 for the CCWRP Process Optimization Projects
RECOMMENDED ACTION:
Adopt a Resolution: 1) approving Amendment 1, Task Orders 4 and 5 with DHI Water and Environment Inc. (DHI) for consulting services in the amount of $49,600 for the CCWRP Process Optimization Projects; 2) Increasing the total value of the Master Consultant Services Agreement to $129,560; 3) approving budget authority of $54,560, including a 10% contingency of $4,960; and 4) authorizing the City Manager to execute all documents related to the project.
STAFF CONTACT:
Daniel Patten, P.E., Engineering Manager (Wastewater)
(650) 922-7248
[email protected]
Jim Porter, P.E., Director of Public Works
[email protected]
BACKGROUND/DISCUSSION:
On May 11, 2026, during the FY 2025-26 Capital Improvements Program (CIP) budget approval process, the Council approved funding for the CCWRP Process Optimization Projects.
The City entered into an agreement, Task Order 1 and Task Order 2 with DHI on February 5, 2025, to begin an operational review of the Calera Creek Water Recycling Plant (CCWRP). Task Order 2 included the development of DHI’s digital model of the CCWRP and holding workshops to identify future operational strategies.
On October 10, 2025, City Council approved Task Order 3 that included further development of the digital model and an operational report outlining process improvements as follows:
• A control strategy based on concentrations of various nitrogen compounds in the wastewater treatment process. DHI estimates that this strategy may reduce aeration demands by up to 40%, potentially saving the City approximately $177,000 per year in energy costs, increasing the Plant’s treatment capacity while reducing its carbon footprint. • Implementation of a Sludge Residence Time (SRT) Controller to improve biological treatment and solids operations.
Task Orders 4 and 5 continue to build on these findings. Task Order 4 will include sampling of the wastewater process throughout the CCWRP to calibrate the model developed in Tasks 2 and 3 and refine the conclusions and recommendations of the report provided in Task 3. Task Order 5 will provide controller designs in the form of detailed control diagrams and a written control narrative describing the methods to be used for future scripting and integration. The Pacifica City Council 2
September 28, 2026
controllers will be implemented through a future design scope to add the necessary instrumentation, control hardware, and software.
DHI has unique experience analyzing CCWRP processes and developing a digital mass balance model of the plant. Procuring consulting services from a separate vendor would require the development of a new digital model and additional data collection. City of Pacifica Administrative Policy #76, Purchasing Policy, section 7.4, authorizes the City Manager to waive bidding requirements for sole source purchases if the City Manager determines sufficient justification exists.
The following table summarizes the schedule anticipated for the CCWRP Process Optimization Projects:
Description Date
Council Approval of Task 4 and 5 September 28, 2026
Task Order 4 Completion 2
nd Quarter, 2027
Task Order 5 Completion 4
th Quarter, 2027
ALTERNATIVE ACTION:
Council may choose not to approve Amendment 1, Task Orders No. 4 and 5; however, doing so would delay the project and the potential realization of wastewater treatment capacity increases and energy-efficiency benefits including cost savings and carbon footprint reduction.
RELATION TO CITY COUNCIL GOALS AND WORK PLAN:
Approval of these Task Orders is consistent with the following Council adopted Goals:
Stewardship of City Infrastructure, street, and facilities:
The Project will help reduce energy usage at the Calera Creek Water Recycling Plant and potentially increase treatment capacity.
FISCAL IMPACT:
The combined cost of Task Orders No. 4 and 5 is $49,600, which aligns with the $50,000 budgeted for the CCWRP Process Optimization Projects under account 518452-51206 -P0036 this year. City Manager recommends including a 10% contingency of $4,960 (to be utilized if and only if necessary) for additional work that may be required due to the complexity of the project, resulting in the total requested budget authority of $54,560. Once approved, the variance will be included in the FY26-27 Wastewater Fund Budget at midyear. There are sufficient reserves in the Unassigned Wastewater Fund Balance (approx. $12.4 million) to accommodate this request.
The Source and Use of Funds spreadsheet is shown below.
Use of Funds
Previously
Approved
Fiscal Year 26-27
Budget
Additional
Budget
Requests
Revised
Totals
Previously Approved Task
Orders 1 - 3
$75,000 $75,000
Pacifica City Council 3
September 28, 2026
Task Order No. 4 -
Advanced SBR Modeling $24,800 $24,800
Task Order No. 5 - SBR
Controller Design $24,800 $24,800
Contingency (10%) $400 $4,560 $4,960
Task Orders 4 and 5, plus
Contingency $54,560
Total Use of Funds $129,560
Project Fund Source
Enterprise Fund (Fund
518) $75,000 $50,000 $4,560 $129,560
518452-51206 -P0036
Total Project Fund
Source $75,000 $50,000 $4,560 $129,560
ORIGINATED BY:
Public Works - Wastewater Division
ATTACHMENT LIST:
Agreement_Amendment_DHI Water Environment Inc_09_28_26_CCWRP RR Project Value Engr_DHI signed_260901 (PDF)
Agreement_DHI Water Environment Inc_TO4_09_28_26_CCWRP RR Project Value Engr_DHI signed (PDF)
Agreement_DHI Water Environment Inc_TO5_09_28_26_CCWRP RR Project Value Engr_DHI signed (PDF)
Pacifica City Council 4
September 28, 2026
RESOLUTION NO.
A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF PACIFICA APPROVING AMENDMENT 1, TASK ORDER 4 AND TASK ORDER 5 WITH DHI WATER AND ENVIRONMENT INC. FOR CONSULTING SERVICES IN THE AMOUNT OF $49,600 FOR THE CCWRP PROCESS OPTIMIZATION PROJECTS; INCREASING THE TOTAL VALUE OF THE MASTER CONSULTANT SERVICES AGREEMENT TO $129,560; APPROVING BUDGET AUTHORITY OF $54,560 WHICH INCLUDES 10% CONTINGENCY IN THE AMOUNT OF $4,960; AND AUTHORIZING THE CITY MANAGER TO EXECUTE ALL DOCUMENTS RELATED TO THE PROJECT.
WHEREAS, during the FY 2026-27 Capital Improvements Program (CIP) budget approval process, the Council approved funding for the CCWRP Process Optimization Projects; and;
WHEREAS, the City has previously entered into a Master Services agreement, Task Orders 1, 2, and 3 with DHI Water and Environment Incorporated for operational review and process optimization at the Calera Creek Water Recycling Plant; and WHEREAS, authorizing Amendment 1, Task Orders 4 and 5 will provide a calibrated digital model of the Calera Creek Water Recycling Plant and new control designs for the Calera Creek Water Recycling Plant’s Sequencing Batch Reactors; and WHEREAS, DHI Inc. has unique experience analyzing the Calera Creek Water Recycling Plant processes and City of Pacifica Administrative Policy #76, Purchasing Policy, section 7.4, authorizes the City Manager to waive bidding requirements for sole source purchases if e/she determines sufficient justification exists; and WHEREAS, an additional $4,960 in budget authorization is requested as contingency for the Calera Creek Water Recycling Plant Process Optimization Projects, with appropriations of $4,960 from the reserves of Fund 518; and
WHEREAS, the City Council has considered the City Manager’s recommendation to authorize Amendment 1, Task Orders No. 4 and 5 with DHI Water and Environment Inc.; and NOW, THEREFORE, BE IT RESOLVED that the City Council of the City of Pacifica authorizes the City Manager to execute Amendment 1, Task Order 4, and Task Order 5 with DHI Water and Environment Inc. for consulting services in the amount of $49,600 for the CCWRP Process Optimization Projects; Increasing the total value of the Master Consultant Services Agreement to $129,560; approving budget authority in the amount of $54,560 which includes 10% contingency of $4,960; and authorizing the City Manager to execute all documents related to the Project.
• • • • •
Pacifica City Council 5
September 28, 2026
PASSED AND ADOPTED at a regular meeting of the City Council of the City of Pacifica, California, held on the 28
th day of September 2026, by the following vote:
AYES, Councilmembers:
NOES, Councilmembers:
ABSENT, Councilmembers:
ABSTAIN, Councilmembers:
_________________________________
Christine Boles, Mayor
ATTEST: APPROVED AS TO FORM:
______________________________ _________________________________ Sarah Coffey, City Clerk Michelle Kenyon, City Attorney