718 Third Street,
Eureka, California 95501
United States
Ghd.com
The Power of Commitment
GHD
Our ref: 12559007
January 06, 2025
Brendan Byrd
City Of Fortuna
P.O. Box 545
Fortuna, CA, 95540-0545
Proposal for Professional Engineering Services: Well 5B System Tie-In Design and System Component Upgrades Assessment
Dear Brendan Byrd:
GHD is pleased to provide this proposal for professional engineering services for the design to integrate Well 5B into the City’s Water System and an assessment to identify potential system component upgrades.
Introduction
This proposal is provided with the understanding that the City of Fortuna desires to have Well 5B integrated into the City Water System, including the SCADA system, and are also interested in other potential system upgrades such as installation of flow meters and transducers for each of the City’s wells and other SCADA improvements. This proposal includes the tasks necessary to accomplish these objectives, including development of the civil and mechanical design, electrical design, construction specifications, regulatory support, bid period services, and an assessment to evaluate potential for the other system component upgrades. Each of these primary tasks are described in further detail in the following sections.
Background
Following Well 5B installation in December 2021, the limited Title 22 water quality testing results within new Well 5B were found to be generally very good. However, the Manganese results were elevated, and substantially higher than the Division of Drinking Water (DDW) primary and secondary maximum contaminant limits (MCLs and SMCLs) for Manganese in community water systems. In 2023, DDW initiated plans for a further reduction of the MCLs for Manganese by more than half the previous reduced limits, resulting in limits of 200 parts per billion (ppb) and 50 ppb, respectively.
In 2022 at the request of the City, GHD performed an Alternatives Analysis for Manganese and Iron removal via treatment options and blending that would treat to the established regulatory limits. It was found that blending with other wells was not an option at the time and anticipated MCLs for Manganese and the costs of treating for Manganese were prohibitive for treatment.
In 2023 a third option was identified, which was to isolate the higher and lower screened intervals, which are screened in different geologic units. The higher screened interval is placed within younger alluvium deposits and the lower screened interval is placed within the Carlotta Formation. Initially, it was proposed that a packer be installed between the upper and lower screened intervals to eliminate groundwater input from the Carlotta Formation (lower screened interval), which is anticipated to be the geologic unit producing the higher level of Manganese. Installation of a packer would allow the lower portion of the well to be reopened should more feasible treatment or blending options become available in the future. 12559007 | Proposal for Professional Engineering Services: Well 5B System Tie-In Design and System Component Upgrades Assessment 2 In 2024 the modifications were made to Well 5B to isolate the upper and lower zones. Due to supply issues a packer was not available for this work. Therefore, another solution was identified to isolate the screened intervals and that can be reversed in the future should the City want to pull from both screened intervals again.
The modification included filling the lower portion of the well with sand and pea gravel and then placing a neat cement plug between the two screened intervals. A 36-hour purge was completed at a steady flow to try and flush the area of influence around Well 5B. Following the purge, an 8-hour step-drawdown pump test was completed, and analytical samples were collected to evaluate manganese concentrations.
The 8-hour pump test showed that Well 5B can be pumped in the 450-500 gpm range without cascading the screens while the other City wells are concurrently pumping. There is potential that the well could provide a higher capacity without cascading screens, however the most recent pump test did not pump above this range.
The objective of installing Well 5B was to replace the current Well 5, which has lower capacity. A portion of the work proposed within this scope will be to compare the cost of installing a well pump that has a variable flow drive versus a single drive. There is potential that a pump with variable flow can be operated within in a range that would offer the City higher efficiency (450-500 gpm) for most pumping needs but also offer higher capacity (600+ gpm) should the City need it for shorter durations of time.
The laboratory analytical data showed significant improvement in manganese concentrations; however, concentrations remain above the MCL (recent reading = 300 ug/l; MCL = 50 ug/L). Well 5B modifications were completed in fall 2024 and the City plans to test again following the wet season and associated higher groundwater flows that may offer additional flushing surrounding Well 5B.
Professional Engineering Scope of Services
The following tasks have been identified to meet project objectives:
– Task 1 – Project Management: Includes project coordination with the City, completing monthly invoicing, managing the project teams, and tracking project progress. – Task 2 – System Upgrades Assessment: This Includes evaluating pump options for Well 5B and doing an assessment for other potential system upgrades. The pump assessment will include an evaluation of the efficiency and cost of installing a variable drive pump. The assessment for system upgrades includes a field visit and coordination with the City to evaluate flow meters and transducers for the other City wells and potential improvements that can be made to the overall SCADA instrumentation and integration. – Task 3 - Civil and Mechanical Design: This task includes design for Well 5B components, design for realignment of the other City well piping connections, and Optional Task 3a. The Well 5B design includes the Well 5B pump, pump house, building slab, connection piping, site grading, and decommissioning and conversion of the original Well 5. The design for realignment of the other City well piping connections includes changing the well transmission pipes such that each well will feed directly into the Treatment unit.
This task will include the design sheets, construction specifications, and Engineers Opinion of Probable Construction Cost (EOPCC). This task also includes Optional Task 3a. Optional Task 3a includes design of the potential upgrades for the other City wells that will be evaluated and recommended under Task 2 (i.e., flow meters and transducers).
– Task 4 – Electrical Design: The electrical design includes the Well 5B electrical design and Optional Task 4a design. The Well 5B electrical design includes the pump motor, pump starter, pump controller, well house electrical, Well 5B SCADA instrumentation, Well 5B SCADA integration. This task will include preparation of the Well 5B electrical design sheets, construction specifications, and EOPCC. Optional Task 4a includes design of the overall SCADA system upgrades that will be evaluated and recommended under Task 2.
– Task 5 – Bid Period Services: Includes preparation of the bid package, bid advertisement, coordination of the pre-bid site walk, hosting of the bid opening, and coordination with the City for bid selection. – Task 6 – Regulatory Support: Includes communication with regulators and Eel River Basin GSA and preparation of the permits necessary to utilize Well 5B as a supply well. 12559007 | Proposal for Professional Engineering Services: Well 5B System Tie-In Design and System Component Upgrades Assessment 3 Task 1 – Project Management
This task includes close collaboration and communication with the City of Fortuna, completing monthly invoicing, management of project technical teams, and tracking of project progress. It is assumed that outside of regular project email communications, there will be a 1-hour Kickoff Meeting with GHD and the City and GHD will meet with the City two times to review and discuss deliverables at each primary design stage (60% and 100%). Three additional meetings are incorporated to discuss other tasks such as bid period services planning, regulatory support, and system component upgrade discussions.
Task 1 Deliverables
1. Invoices and progress information via email.
2. 1, 1-hr Kickoff Meeting.
3. 2, 1-hour design review meetings.
4. Up to 3 additional 1-hour meetings that may be utilized for bid period services planning, regulatory support discussions, and system component upgrade discussions.
Task 1 Assumptions:
1. Invoices will be delivered via electronic format.
2. Each meeting may include the GHD project manager, task technical lead, and engineer of record.
Task 2 – System Upgrades Assessment
This task includes evaluating pump options for Well 5B and doing an assessment for other system upgrades for the wells and the SCADA system.
The Well 5B pump assessment will include an evaluation of the efficiency and cost of installing a variable drive pump. There is potential that a pump with variable flow drive can be operated within in a range that would offer the City higher efficiency (450-500 gpm) for most pumping needs but also offer higher capacity (600+gmp) should the City need it for shorter durations of time.
The system upgrades assessment will evaluate upgrades to the other City wells and to the overall SCADA system and will include a site visit with the City. The City has identified that some of the groundwater wells are showing decline, however with the current monitoring capabilities it is difficult to track the decline through time to evaluate the severity. Therefore, the upgrades assessment will provide recommendations for well flow meters, transducers, and upgrades to SCADA system instrumentation and integration.
Task 2 Deliverables:
1. Final Technical Memorandum with recommendations for Well 5B pump, well flow meters, well transducers, SCADA system instrumentation upgrades, and SCADA system integration upgrades.
Task 2 Assumptions:
1. Deliverable will be in electronic format.
2. Does not include design of the potential system upgrades. See Optional Task 3a for well flow meter and transducer design and Optional Task 4a for SCADA system upgrades. 12559007 | Proposal for Professional Engineering Services: Well 5B System Tie-In Design and System Component Upgrades Assessment 4 Task 3 – Civil and Mechanical Design
This task includes design for Well 5B components, design for realignment of the other City well piping connections, and Optional Task 3a.
The Well 5B design includes the Well 5B pump, pump house, building slab, connection piping, site grading, and decommissioning and conversion of the original Well 5. Building design will follow the City’s building standards and the building code minimum values will be used for foundation design. The design for realignment of the other City well piping connections will change the water transmission pipe from each well so that it has a direct connection to the treatment unit. There will then be parallel flow from each well into the treatment unit, instead of combined flow into the treatment unit. This task will include the design sheets, civil and mechanical construction specifications, and Engineers Opinion of Probable Construction Cost (EOPCC). GHD will prepare 60% and 100% design plans, specifications, and EOPCC for City review.
This task also includes Optional Task 3a. Optional Task 3a includes design of the potential upgrades for the other City wells that will be evaluated and recommended under Task 2 (i.e., flow meters and transducers). If the City chooses to add Optional Task 3a then the design sheets, specifications, and EOPCC will be incorporated into the 100% deliverables for Task 3.
The following design sheets are proposed for the civil and mechanical design.
Well 5B Design and Well Piping Realignment:
– Cover (1 sheet)
– Notes (1 sheet)
– Well 5B pump (1 sheet)
– Well 5B piping diagram and fittings table (2 sheets)
– Well 5B building (4 sheets)
– Well 5B building slab/footings/pedestal (2 sheets)
– Well 5B building structural components (2 sheets)
– Original Well 5 decommissioning (1 sheet)
– Well 1, 2, and 4 piping realignment to treatment unit (3 sheets) – Well 1, 2, and 4 piping diagram and fittings table (4 sheets) – Well 1, 2, and 4 piping connection to treatment unit details (2 sheets) – Site grading (1 sheet)
Optional Task 3a:
– Well 1, 2, and 4 flow meters (3 sheets)
– Transducer Installation detail (1 sheet)
Task 3 Deliverables:
1. Design plans, specifications, and EOPCC – 60%.
2. Design plans, specifications, and EOPCC – 100%.
If elected:
3. Optional Task 3a Design plans, specifications, and EOPCC – 100%.
Task 3 Assumptions:
1. Building design will follow the City’s standards, which are assumed to be the California Building and Electrical Codes.
12559007 | Proposal for Professional Engineering Services: Well 5B System Tie-In Design and System Component Upgrades Assessment 5
2. Footings and foundation design will assume the building code minimum values and no geotechnical investigation will be needed.
3. All deliverables will be in electronic format.
4. Well 5 decommissioning will satisfy permit conditions for well replacement/abandonment.
5. City review will occur at each major design stage.
Task 4 – Electrical Design
The electrical design includes the Well 5B electrical design and Optional Task 4a design.
The Well 5B electrical design includes the pump motor, pump starter, pump controller, pump house electrical, SCADA instrumentation, SCADA integration, and preparation of the electrical component’s construction specifications and EOPCC. GHD will prepare 60% and 100% design plans, specifications, and cost estimate for City review that will be delivered with the civil and mechanical design sheets.
Optional Task 4a includes the design for the overall SCADA system upgrades that will be evaluated in Task 2.
This includes 60% and 100% SCADA design plans, integration, specifications, and cost estimate for the overall system upgrades. It is proposed within the schedule included below, that Task 2 deliverables will be completed prior to the 60% electrical design so that there is time to design Well 5B SCADA to be integrated into any new SCADA system upgrades that are elected.
The following design sheets are proposed for the electrical design.
Well 5B electrical design:
– Well pump tie-in to existing electrical system (1 sheet) – Well pump 1-line diagram / well pump starter control diagram (1 sheet) – Well house electrical tie-in (2 sheets)
– Well 5B SCADA instrumentation (1 sheet)
– Well 5B SCADA integration (1 sheet)
Optional Task 4a:
– Overall SCADA System instrumentation upgrades (4 sheets) – Overall SCADA System integration upgrades (2 sheets)
Task 4 Deliverables:
1. Well 5B electrical plans, specifications, and estimate – 60%.
2. Well 5B electrical plans, specifications, and estimate – 100%.
If elected:
3. Optional Task 4a SCADA plans, specifications, and estimate – 60%.
4. Optional Task 4a SCADA plans, specifications, and estimate – 100%.
Task 4 Assumptions:
1. Electrical design deliverables will be delivered with the civil and mechanical deliverables.
2. All deliverables will be in electronic format.
3. City review will occur at each major design stage.
4. Electrical design will follow the City’s standards, which are assumed to be the California Building and Electrical Codes.
12559007 | Proposal for Professional Engineering Services: Well 5B System Tie-In Design and System Component Upgrades Assessment 6 Task 5 – Bid Period Services
GHD will provide the following bid period services:
– Compile bid package and front-end contract documents. – Prepare Advertisement for Bid
– Provide bid documents in electronic format to Builder’s Exchanges for distribution to contractors – Issue Addenda in electronic format to Builder’s Exchanges as warranted during bidding to address written Contractor questions submitted as well as other project clarifications. – Plan and conduct a pre-bid site meeting
– Plan and participate in bid opening
– Review Contractor bids
– Review the apparent low bid Contractor provided bonds and insurance – Prepare recommendation for award and work with the District on preparing the contract documents for Board approval and execution
Task 5 Deliverables:
1. Advertisement for Bid.
2. Addenda (up to 5).
3. Notice of Award.
4. Contract Documents.
5. Notice to Proceed.
Task 5 Assumptions:
1. All deliverables will be in electronic format.
2. Does not include redesign of project elements during bidding.
3. The City’s will provide the front-end document template.
4. The City’s legal counsel will review and approve the final contract documents.
5. City to post advertisement for bid in local publication.
6. All fees to be paid directly by the City.
Task 6 – Regulatory Support
Prior to installation of Well 5B a CEQA Categorical Exemption (CE) was filed for the project. The project filed as a CEQA CE because Well 5B is a replacement to the original Well 5, as Well 5 capacity has decrease through time. This task is to provide documentation of Well 5 decommissioning to satisfy the CEQA CE on file. This task is also for coordinating with local and State regulators to ensure that they receive the documentation required to have Well 5B incorporated into the City’s system, including copies of the CEQA CE, Humboldt County Environmental Health Well Permit, and the Department of Water Resources Well Completion Report and Modified Well Completion Report. This task also covers coordination with the Eel River Groundwater Sustainability Agency.
Task 6 Deliverables:
1. Permit package delivered to required agencies via electronic format.
Task 6 Assumptions:
1. The CEQA CE filed prior to Well 5B installation still applies to project. 12559007 | Proposal for Professional Engineering Services: Well 5B System Tie-In Design and System Component Upgrades Assessment 7
2. No City or County grading or building permits will be required.
3. This property is mapped as being outside of the Coastal Zone and therefore no Coastal Development Permit will be required.
GENERAL EXCLUSIONS AND ASSUMPTIONS
This scope of services is based on the tasks described above which are anticipated for the project. The City may need additional services during the process of the project due to increased regulatory issues, unusual public interest, and additional issues identified during the project.
This proposal is based on the following assumptions:
– This scope does not include anything not specifically described above. – The scope does not include construction oversight or management tasks. GHD is happy to provide a scope and fee for construction management following design development. – The scope of services does not include payment of any fees for applications or permits, or newspaper advertisement/notification fees.
– The scope of services does not include any design changes following the completion of the 100% design submittal.
– The City will complete their review of the plans and prepare any comments they have in a timely manner and will deliver one set of rectified comments to GHD following review.
Proposed Schedule
Table 1 Schedule by Task and Milestone.
Task Deliverable Tentative Date
Task 1 – Project Management Project Closeout September 1, 2025 Task 2 – System Upgrades Assessment Final Technical Memorandum March 24, 2025 Task 3 – Civil and Mechanical Design 60% Deliverables April 30, 2025 100% Deliverables June 15, 2025
Task 4 – Electrical Design 60% Deliverables April 30, 2025 100% Deliverables June 15, 2025
Task 5 – Bid Documents Advertise for Bid July 1, 2025
Bid Opening August 1, 2025
Task 6 – Regulatory Support Environmental Documentation and Permits Complete June 15, 2024
718 Third Street,
Eureka, California 95501
United States
Ghd.com
The Power of Commitment
GHD
Compensation
Table 2 Proposed Project Budget.
Task Fee
Task 1 – Project Management $16,854
Task 2 – System Upgrades Assessment $23,914
Task 3 – Civil and Mechanical Design
Task 3 $85,309
Optional Task 3a $18,698
Total (with Optional Task) $104,007
Task 4 – Electrical Design
Task 4 $16,790
Optional Task 4a $16,027
Total (with Optional Task) $32,818
Task 5 – Bid Documents $21,497
Task 6 – Regulatory Support $9,667
Totals
Project Total (with Optional Tasks) $208,756
Project Total (without Optional Tasks) $174,031
Brett Vivyan, PE
Project Direct/Engineer
[email protected]
Regards
Mindi Dunne, PG
Project Manager/Geologist
[email protected]
Copy to: Patrick Sullivan