TO:Andrew P. Powers, City Manager
FROM:Clifford G. Finley, Public Works Director
DATE:May 9, 2023
SUBJECT: Wastewater Interceptor Capital Improvement Project Unit Y2 (CI 5328)
RECOMMENDATION:
1. Approve Fourth Amendment to Professional Services Contract No. 13039-2022 with Padre Associates, Inc. (Ventura, CA) for additional Construction Phase Environmental Monitoring and Regulatory Permit Five-Year Mitigation Monitoring Services on the Wastewater Interceptor Capital Improvement Project Unit Y2 (CI 5328) in the amount of $28,521.50, plus extra services of $2,600 for a new not-to- exceed amount of $118,981.50.
2. Find that this action is not a project as defined under the California Environmental Quality Act.
FINANCIAL IMPACT:
No Additional Funding Requested. Minimal staff time and costs required to advertise for bids, along with $4,549,706 project budget is included in the Adopted FY 2022-23 Wastewater Fund Capital Budget (CI 5328). Estimated total project cost is $4,450,000.
BACKGROUND:
The Unit Y interceptor pipeline delivers a large volume of the City’s wastewater by gravity and pressurized pipeline to the Hill Canyon Treatment Plant (HCTP) for treatment. The interceptor is in the canyon of the Wildwood recreational area. The pipeline follows an access road and traverses open space and enters the HCTP through a meter vault at the north end of the facility (Attachment #1).
At the terminus of Unit Y, where it enters the HCTP facility, there is an 18-inch diameter double barrel (two pipes) pressurized pipeline inverted siphon for approximately 2,000 feet. Access structures are located along the gravity portion of the alignment; however, there are long reaches of pipeline where no access structure exists. The City has installed cured in place pipe (CIPP) lining material on the upper gravity reaches of the pipeline as part of previous projects. The pressurized inverted siphon section of pipeline has not been lined and presents challenges that need to be addressed as part of this project.
WW Interceptor CIP Unit Y2 (CI 5328)
May 9, 2023
6 5
0 This project includes removal of the existing five pipeline cleanout structures, minor tree trimming and temporary access road construction necessary for the equipment to reach the site of the project, cleaning of the existing sewer pipelines, installation of two 18-inch diameter cured in place pipelines to rehabilitate the existing 18-inch diameter pipes, installation of three pipeline access structures, replacement of the pipelines associated with the HCTP meter structure and rock catcher, rehabilitation of the siphon inlet structure, and removal of the temporary access road.
On June 14, 2022, Padre Associates, Inc. (Padre), a professional environmental firm, was awarded a contract by City Council to perform the environmental permit monitoring activities during construction. Padre had performed the initial permit assistance and coordination with the regulatory agencies and was selected because they were familiar with the project and deemed to be the most qualified firm. Three amendments were issued to Padre during the construction phase of the project. Amendment No. 1 was a fee amendment in the amount of $4,097.50 to cover the monitoring costs for the regulatory permit requirement for fan palm tree removals. Amendment No. 2 was a contract extension due to the delay in construction activities and Amendment No. 3 was a fee amendment in the amount of $3,882.50 to cover initial emergency regulatory permit assistance.
City Council awarded the construction contract for the Unit Y2 project to Blois Construction, Inc. (Blois) on June 14, 2022. Construction started in August 2022, and will be completed at the end of May 2023.
DISCUSSION/ANALYSIS:
The construction phase of the project is nearly complete. The regulatory permits necessary to construct the project within the environmentally sensitive canyon environment require a five-year monitoring environmental program. The first year has already been completed. The original contract did not include this level of environmental monitoring. The remaining four-year monitoring effort is still required and will be performed by the project environmental consultant Padre as a continuation of their professional services performed to date. The additional scope of work includes botanical surveys to be conducted to document changes in species richness over time within the Mitigation Area and preparation of an annual Mitigation Monitoring Report to be submitted to the Department of Fish and Wildlife by December 31, of each of the next four years that remain. Amendment No. 4 will increase the contract amount by $28,521.50 to a new contract total of $116,381.50 plus $2,600 in extra services for a total not-to-exceed amount of $118,981.50, and will extend the contract expiration date to June 30, 2027. Amendment No. 4 is included as Attachment #2.
WW Interceptor CIP Unit Y2 (CI 5328)
May 9, 2023
6 5
0 The breakdown of Padre’s contract and amendments is as follows:
Environmental Permitting Assistance (previously approved) $ 79,880.00 Envir. Const. Phase Monitoring Services (previously approved) $ 4,097.50 Extra Const. Phase Monitoring Services (previously approved) $ 3,882.50 4-Year Envir. Permit Mitigation Monitoring Services (this action) $ 28,521.50 Extra Services for Monitoring Services (this action) $ 2,600.00 Environmental Support Services and Permitting $ 118,981.50 Community Outreach: This project is limited to work at the HCTP and does not impact neighboring residences. The work will be at the north end of the plant and will have limited impact to plant operation. Construction-related impacts to hiking trail users will be minimal.
City Council adopted the Mitigated Negative Declaration and Mitigation Monitoring Program for the project on July 6, 2021.
This project meets City Council’s Top Ten Priorities #9, “Public Works Infrastructure Investments.”
CIP PROJECT PRIORITY (as outlined in FY 2021-23 CIP Program Budget) Priority Two – Necessary, but not essential, and there could be consequences if deferred.
COUNCIL GOAL COMPLIANCE:
Meets the following City Council goal:
F. Provide and enhance essential infrastructure to ensure that the goals and policies of the Thousand Oaks General Plan are carried out and the City retains its role and reputation as a leader in protecting the environment and preserving limited natural resources.
PREPARED BY: Nader Heydari, Deputy Public Works Director Attachments:
Attachment #1 – Vicinity and Location Maps
Attachment #2 – Fourth Amendment to Professional Services Contract No.13039-2022 with Padre Associates, Inc.
DPW: 850-20\ev\Council\2023\050923\CI 5328\ Wastewater Interceptor CI Project Unit Y2 closeout staff report.docx