further analysis applying a 10-year flood event standard to the proposed project. In response, the applicant prepared 3 separate stormwater detention standards for consideration, all of which exceeded the 10-year flood event standard. The applicant included revised stormwater plans allowing for stormwater containment from a 25-year storm. Also refer to response #7 of this memo.
2. For 2800, why the 7-foot pad elevation for the house? Are the other PUD properties similarly elevated? Response: The pad elevation is 7 feet above the lowest point of the project site. The first-floor height of the proposed residence is 36-feet above sea level, and approximately 2.5 feet below the adjacent Champs Elysee cul-de-sac elevation in the front yard area. The entire 36-foot finish floor building pad elevation is level to the rear yard retaining wall (top of wall 36 feet and bottom of wall 33 to 34 feet above sea level). The bottom of the retaining wall elevation continues to gently slope westward to approximately 30 feet elevation at the westernmost property line.
Figure 2 Profile of site and elevation above sea level
The parcel map for the 4-lot PUD identifies the following pre-development buildable area elevations and the finish floor elevations (Parcel A is the easternmost lot and Parcel D is the westernmost proposed project site). See table below.
30 feet
above
sea level
38 feet
above
sea level
497
Parcel Parcel Map Elevation
(Approx. ft. above sea level)
Finished Floor Elevation
(Approx. ft. above sea level)
A (Vacant Lot) 37-40 Vacant
B (Single Family Residence) 38-39 41
C (Single Family Residence) 36-39 40
D (Proposed Project) 30-38 36
Table 1 Stoloski Gonzalez PUD Elevation Comparison
3. Was the entire PUD evaluated for geology/soils, stormwater issues? Response: Geology, soils, and hydrology were evaluated for the entire PUD during the review and approval of the tentative parcel map for the PUD in 2012. Geology, soils, and hydrology were further evaluated during the review of the individual lots, including 2801 Champs Elysee in 2018, 2778 Pullman Avenue in 2020 and the project site between 2017 and 2024. Also see page 3 of the staff report which identifies the analysis and City peer review related to the proposed project site. The peer review and associated documents are attached to the Planning Commission staff report from the September 2024 meeting.
4. Why isn’t the garage attached as other homes in the area? Response: The home design is presented by the applicant. During the two Architectural Advisory Committee (AAC) meetings, the proposed garage and breezeway connection to the residence was described as integral to the residential design. Page 2 of the staff report identifies the two Architectural Advisory Committee (AAC) reviews that took place on the residential design of the project. Although attached garages more commonly occur in the adjacent neighborhood, the AAC was supportive of the current project design proposal.
5. Why does the proposed detention have earthen containment with all those erodible soils? Response: The City’s peer review consultant prepared and presented recommendations related to the revised stormwater detention design for the project to the Planning Commission at the September 2014 meeting. The peer review consultant cited in his comments, “The berm’s crest is approximately 12-inches wide and composed of earthen fill. Our experience suggests that rodent burrows within the berm could reasonably be expected to compromise the ability to retain water to the full depth.” Condition of approval B5 and B13 of Attachment 2 requires hydrological modeling and geotechnical reporting to verify the functionality of the new detention basin prior to the issuance of the building permit. If the analysis concludes that the functionality of the new detention basin is of concern, revisions to the detention basin design will be required. The consultant noted that the berms could be reduced or eliminated to avoid potential flood-related impacts to drainage flow if identified in the following up modeling noted in the condition of approval B5.
6. What changes, if any, have been made to the project/project drainage retention basin as a result of the Waterways consultant peer review input?
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Response: Following the peer review of the preliminary grading, utility, and stormwater design, the applicant replaced their original 10-year storm drywell design with a revised 25-year detention basin design to further address public comment regarding on-site and off-site drainage impacts from the impermeable runoff impacts of the proposed project. The revised plans were integrated into the civil plans (Attachment 3). In addition, Condition B5 was added to the conditions of approval (Attachment 2) to ensure that the recommendations of the peer review are implemented.
7. What were the impacts of the December 2022-January 2023 storm events on the Pullman Channel and vicinity in terms of overtopping the banks and flooding of properties on both sides of the channel in the vicinity of the project PUD?
Response: Although staff does not have precise confirmation of the requested Pullman Channel flooding information in the 4-lot PUD vicinity, the City has received written and oral public comment from various nearby neighbors and the public for the Planning Commission public hearing, including photographs, and recorded video of: stormwater backing up onto the property east of Cabrillo Highway; reporting by the adjacent homeowner (2804 Champs Elysee) of flooding on his property; and photographs from 2801 Champs Elysee of water overflowing the Pullman Channel onto the westerly (lower elevation) portion the proposed project site.
8. Was a site-specific geological hazards report prepared for this project by a qualified professional per LUP policy 7-46? Please send copy or link.
Response: A geotechnical investigation was prepared for the site and included a section on potential geological hazards. The geotechnical investigation was peer reviewed by the City’s consulting civil engineering firm (Waterways Inc.). No mitigation measures related to geologic hazards were included as recommendations within the geotechnical investigation. The report and peer review are available here.
499
BUSINESS OF THE COUNCIL OF THE CITY OF HALF MOON BAY
AGENDA REPORT
For mee�ng of: October 15, 2024
TO: Honorable Mayor and City Council
VIA: Mathew Chidester, City Manager
FROM: Maz Bozorginia, Public Works Director/City Engineer Helen Wolter, Public Works and Sustainability Programs Manager TITLE: MUNICIPAL ENERGY PROJECT UPDATES
___________________________________________________________________________ RECOMMENDATION:
Adopt a Resolu�on authorizing the City Manager to execute a Power Purchase Agreement for the Solar Photovoltaic System at the Emergency Opera�ons Center Parking Lot and the City Hall Parking Lot in partnership with Peninsula Clean Energy Authority.
FISCAL IMPACT:
There are no expected upfront costs to the City for the Solar PV projects. The Solar PV Systems would be financed through a Power Purchase Agreement (PPA) with Peninsula Clean Energy. With a PPA model, Peninsula Clean Energy will contract for the installa�on, opera�ons, and maintenance of the Solar PV System, and the City would pay an agreed upon price per kilowat-hour (kWh) for power generated throughout the system’s life (further details below). The PPA will be provided “at cost” by Peninsula Clean Energy to cover equipment, installa�on, maintenance, and administra�ve expenses.
Per Government Code sec�on 4217.12, it is an�cipated that the energy improvements proposed by the contract will result in energy cost savings to the City of $250,800 over a 20- year period, based on expected energy costs without any energy upgrades calculated on current energy usage with a 4% annual escala�on.
STRATEGIC ELEMENT:
This ac�on supports the Fiscal Sustainability, Healthy Communities and Public Safety, and Infrastructure and Environment Elements of the Strategic Plan.
BACKGROUND:
The City Council expressed interest in installing solar photovoltaic (PV) systems on City Facili�es to promote the use of renewable energy and reduce electricity costs. The aim is to electrify and update the City’s energy related opera�ons to be as efficient as possible while reducing greenhouse gas emissions. Both goals were formally adopted in the City’s Climate 500
Ac�on and Adapta�on Plan (CAAP) Phase 1, in December 2023. Specifically, the Municipal Electrifica�on Project’s goals meet the City’s stated CAPPs goals:
• ME-1: Employ carbon-free electricity for all municipal opera�ons and increase supply of local, renewable energy supply at municipal facili�es. • ME-2: Electrify all municipal facili�es by 2025.
• ME-3: Increase the energy efficiency of all municipal facili�es and opera�ons.
Throughout 2023, staff explored potential paths to add additional solar PV to City facilities, as it can produce enough energy to then make other electrification efforts cost effective.
At the February 6, 2024, City Council meeting, Council was presented with options to meet the stated goals above, including entering into a Power Purchasing Agreement (PPA) as part of the Solar & Storage for Public Buildings Program through Peninsula Clean Energy (PCE), or purchasing the solar photovoltaic (PV) system outright and complete a more comprehensive electrification project through a contract with Willdan Energy Solutions (Willdan). Ultimately the City opted to proceed with the purchase of the PV system outright and to continue with a more comprehensive electrification project with Willdan. For additional details, the staff report and supporting documentation can be found here.
At the May 7, 2024, City Council mee�ng, Council authorized the City Manager to enter into the first phase of the Energy Service Contract with Willdan. The first phase of the contract included an audit of City facilities and evaluation of anticipated energy improvements with their associated construc�on es�mates at a cost of $29,000. At that �me, Willdan es�mated Phase 2 of Municipal Electrifica�on Project would cost $1,341,137, inclusive of the $29,000 audit fee. The Energy Services Agreement states that work will be done in phases (Investment-Grade Audit (IGA) Phase, Construc�on Phase, and Guarantee Phase), and that the Construc�on Phase does not commence un�l the City executes a Performance Contract Amendment. Per the Energy Service Contract, the City would consider the second phase of the contract, which includes final permitting, design, and construction. For additional details, the staff report and supporting documentation can be found here. Recently, staff was no�fied of a new cost es�mate from Willdan based on the audit of City facili�es. The new cost es�mate had risen to $2,325,000 (an increase of $983,863).
Due to the unexpected excessive cost increases, Staff reached out to PCE to see if other op�ons exist given the �me constraints of the NEM 2.0 requirements. To maximize our return on investment over �me, the comple�on of the solar PV improvements at City Hall and the Emergency Opera�ons Center (EOC) are essen�al to maintain eligibility with NEM
2.0 while the remaining electrifica�on scopes are completed in the near future.
In 2022, the California Public U�li�es Commission approved Net Energy Metering (NEM) 3.0 for solar projects, which reduced the amount paid by u�lity companies to customers for excess solar energy provided to the grid during �mes of ample renewable energy. When the State of California no�fied consumers of the new rate structure, the City worked with PCE on the site design and planning elements of the proposed photovoltaic solar project to successfully submit the required paperwork before the April 14, 2023, state deadline.
Currently, the project remains under the grandfathered NEM 2.0 rate structure provided all subsequent deadlines are met and the PV systems are installed and energized by April 14, 501
2026. However, if the interconnec�on deadlines are missed, the project would revert to the NEM 3.0 system with the associated lower benefits rate structure.
DISCUSSION:
When Staff reached out to PCE to discuss alterna�ves to deliver the PV system under the �ght �meline, PCE stated that the City could s�ll revert back to the earlier proposed Power Purchase Agreement (PPA) under their exis�ng project.
With this alterna�ve s�ll available, City staff is presen�ng the following op�ons to deliver the PV system under NEM 2.0 rates:
1. Enter into the proposed Power Purchase Agreement (PPA) with Peninsula Clean Energy.
2. Con�nue with Willdan Energy Services Under the Energy Services Project Agreement (with modifica�on to the scope).
3. Work with a different contractor that would independently construct the two planned solar arrays.
Below is a more in-depth discussion of each of the three op�ons iden�fied above based on direc�on, project scope, budget and schedule:
OPTION 1 – Enter into the proposed Power Purchase Agreement (PPA) with Peninsula Clean Energy
As PPA’s are structured for no upfront construc�on costs to the City for the installa�on of the PV solar systems, the PPA is an appealing op�on given the City’s �ght finances. The proposed systems are expected to provide cost savings, and those savings are expected to grow over �me due to expected increases in u�lity costs, which are projected to rise as much as 5% or more per year according to proposals by PG&E at the California Public U�li�es Commission.
PCE is proposing a flat rate, without an annual escala�on. The prices would be fixed for the 20-year term of the PPA for each facility (City Hall and EOC array). Final pricing may increase by no more than 5% even if addi�onal costs are incurred during construc�on. The City would be eligible to walk away from the project without penalty if construc�on costs increase the PPA price beyond 5%.
Electricity to meet facility electrical loads is purchased in units of kilowat-hours (kWh). The price per kWh (PPA rate – 0.274 per kWh) iden�fied in the PPA is provided “at cost” by PCE which will cover equipment, installa�on, maintenance and administra�ve expenses with no annual escala�on rate to the City. Through the PPA model, the City is responsible to pay for power use at the PPA rate. Once installed, the PV systems should generate enough electricity to offset most the City’s building electrical loads. PCE will benefit from any electricity generated beyond the usage for each facility and sold back to PG&E under NEM 2.0 rates.
Any addi�onal electrical usages by the facili�es will s�ll be charged at the PPA rate set by PCE.
The City would have the op�on to purchase the systems at year six or at year 20. An early purchase could give the City the opportunity to realize greater opera�onal savings. The purchase price would be calculated by a fair-market appraisal at the �me of purchase. 502
OPTION 2 – Con�nue with Willdan Energy Services Under a modified Project Scope On May 7, 2024, Willdan provided preliminary cost es�mates for the comprehensive project op�on at $1,350,000, which included the PV arrays at both facili�es as well as several other electrifica�on improvements city-wide. Phase One of the contract with Willdan allowed for finalizing construc�on scope and es�mates prior to entering into a construc�on agreement.
This step was always required the item to be brought back to council for final approval.
Willdan’s second phase was expected to finalize the scope of the work pursuant to the Energy Services Contract and included the actual construction of the improvements.
However, Willdan’s construction estimate for the project increased to $2,325,000 for the full project scope, including:
- PV installation at the City Hall and Sheriff Substation parking lots - City Hall roof repair and HVAC upgrades
- One (1) EV charging station at City Hall
- Additional electrification improvements at Ted Adcock Community Center, Train Depot, and Corporation Yard
Due to the cost increases, staff asked for a smaller scope proposal with just the solar component. Willdan proposed a new project with only PV solar installation of the two facilities at cost of $1,357,864. Additionally, Staff requested proposals from PCE and contractors and received estimates in the range of $650,000 - $800,000.
State law, specifically Government Code sec�ons 4217.10 through 4217.18, establishes a procurement policy that enables the financing and development of infrastructure improvement projects that could result in energy and/or cost savings to public agencies. To qualify to use sec�on 4217.12, the project or agreement would need to demonstrate that the an�cipated cost under the contract will be less than the an�cipated cost to the City that would have been paid in the absence of this power purchase agreement PPA. In the case of the proposed PPAs, the agreements qualify as the price for the electricity generated would be less than what the City currently pays, and the rate would remain fixed over �me.
Government Code sec�on 4217.13 requires the proposed financing arrangement be in the best interest of the city and the funds for the repayment of the financing must be projected to be available from funding that otherwise would have been used for the purchase of electrical energy required by the City. The an�cipated savings from the systems would similarly qualify the project to use Government Code sec�on 4217.13.
OPTION 3 – Work with a different contractor to independently construct the two planned solar arrays.
While the City owns the solar applica�on with PG&E which guarantees NEM 2.0 rates (when mee�ng the April 2026 deadline), it would be less expensive to enter into an independent agreement with a locally sourced electrical contractor. However, this op�on is complicated by the NEM 2.0 �meline. If the City chose to enter a new contract with a different vendor, staff would need to dra� and execute a new request for bids. The cost of this op�on is 503
es�mated to be between $650,000 - $800,000, to be determined a�er the public bidding process for this op�on. Financing of this op�on would be similar to op�on 2, in that it s�ll requires some capital investment and financing, although to a lesser amount than op�on 2.
This route would impact the overall schedule and put the City in jeopardy of losing out on the NEM 2.0 rate structure.
SUMMARY:
Based on the cost and schedule impacts related to NEM 2.0 rates, staff recommends the City Council authorize a Power Purchase Agreement with PCE for the installa�on of Solar PV Systems at the Emergency Opera�ons Center (EOC) and City Hall.
ATTACHMENTS:
1. Resolu�on
2. Facility and Equipment Specifics
504
RESOLUTION NO C-2024-
A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF HALF MOON BAY AUTHORIZING THE
CITY MANAGER TO EXECUTE A POWER PURCHASE AGREEMENT FOR THE SOLAR
PHOTOVOLTAIC SYSTEM AT THE EMERGENCY OPERATIONS CENTER PARKING LOT AND THE
CITY HALL PARKING LOT IN PARTNERSHIP WITH PENINSULA CLEAN ENERGY AUTHORITY WHEREAS, the City Council of the City of Half Moon Bay has demonstrated its commitment to a sustainable and resilient future through its policy goals and ac�ons, including energy reduc�on, clean energy programs, and the expansion of local renewable power supply; and
WHEREAS, on December 5, 2023, the Half Moon Bay City Council adopted Half Moon Bay’s Climate Ac�on and Adapta�on Plan Phase One to reduce greenhouse gas emissions by 40% compared to 1990 levels by 2030 and reach carbon neutrality no later than 2045; and WHEREAS, the City of Half Moon Bay’s Climate Ac�on Plan sets the goals of providing state-of-the-art, well-maintained infrastructure, ameni�es, and facili�es, crea�ng a resilient, safe, connected, and prepared organiza�on and being a global leader in addressing climate change, advancing environmental jus�ce, and protec�ng the environment; and WHEREAS deploying solar power on agency facili�es will lower energy costs, insulate the agency from rising u�lity rates, assist with mee�ng the City of Half Moon Bay’s emissions goals and provide for clean energy thereby crea�ng more resilience, advancing environmental equity, increase local clean energy usage; and NOW THEREFORE, BE IT RESOLVED THAT the City Council of the City of Half Moon Bay authorizes the City Manager to execute a Power Purchase Agreement for the solar photovoltaic system at the Emergency Opera�ons Center parking lot and the City Hall parking lot in partnership with Peninsula Clean Energy Authority. ***************************************************************** I, the undersigned, hereby cer�fy that the foregoing Resolu�on was duly passed and adopted on the 15th day of October 2024, by the City Council of Half Moon Bay by the following vote:
AYES, Councilmembers:
NOES, Councilmembers:
ABSENT, Councilmembers:
ABSTAIN, Councilmembers:
ATTEST: APPROVED:
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___________________________ _____________________________ Jessica Blair, City Clerk Joaquin Jimenez, Mayor
506
Atachment 2
Facility and Equipment Specifics
The following City of Half Moon Bay facili�es have been evaluated for solar photovoltaic and batery energy storage poten�al and a design developed as follows:
Facility #1:
San Mateo County Sheriffs Substa�on/Emergency Opera�ons Center 537 Kelly Ave, Half Moon Bay, CA 94019
Equipment #1:
Solar PV: 73 kW-DC [carport]
Facility #2:
City Hall
501 Main St, Half Moon Bay, CA 94019
Equipment #2:
Solar PV: 37 kW-DC [roo�op and carport]
507
BUSINESS OF THE COUNCIL OF THE CITY OF HALF MOON BAY
AGENDA REPORT
For meeting of: October 15, 2024
TO: Honorable Mayor and City Council
VIA: Matthew Chidester, City Manager
FROM: Maz Bozorginia, Public Works Director/City Engineer TITLE: SEWER AUTHORITY MID-COASTSIDE PROPOSED 5-YEAR INFRASTRUCTURE PLAN
______________________________________________________________________________ RECOMMENDATION:
By motion, accept the Sewer Authority 5-Year Infrastructure Plan (Capital Improvement Program).
FISCAL IMPACT:
There is no immediate fiscal impact with this action. SAM’s proposed Capital Improvement Plan (CIP) is currently estimated at $18,600,000, which is spread over a 5-year period. CIP funding requests will be included in annual budget requests provided by SAM prior to the end of the current Fiscal Year.
SAM costs are paid from City sewer revenues (sewer user fees—Sewer Fund 05) and transfers of funds from the Sewer Capital Fund (Sewer Fund 06) as adopted by City Council per the 2020 Rate Study. While there are sufficient funds at present, staff will assess potential funding actions in the coming fiscal year.
BACKGROUND:
The Sewer Authority Mid-Coastside (SAM), a Joint Powers Authority (JPA), is made up of three member-agencies: City of Half Moon Bay (City), Granada Community Services District (Granada), and the Montara Water and Sanitary District (Montara). Each year, the three member-agencies must each adopt the SAM General Budget, which includes General Operation and Maintenance and Infrastructure (capital repair and construction) Projects, what typically is included in a separate Capital Budget. The JPA provides that O&M costs are funded by the three agencies based on their respective flows into the SAM Treatment Plant. The City’s flows are calculated at 60.82% of total flows, which was down from 61.5% from the previous Fiscal Year.
A significant component over the last couple years has been the increase in costs on the infrastructure line item. For Fiscal Year 2024-25, the total SAM Operations and Maintenance 508
Budget was approved at $9,375,173, of which $3,000,000 was allocated towards capital expenditures. The City’s purported share of the General Budget, based on flow rate of 60.82%, was calculated to $5,642,255 – of which approximately $1,800,000 is for infrastructure improvements.
DISCUSSION:
Over the last several years, the SAM Board and member agencies have requested a long-term plan to better understand what capital improvements are upcoming and to help identify the cost associated with the work to support budget planning. At the August 12, 2024, SAM Board of Directors meeting, SAM staff presented a proposed 5-year infrastructure plan (Attachment 2) with the request to either approve the plan as-is or to send it to Member Agencies for discussion prior to bringing it back to the SAM Board for approval.
The Proposed 5-Year Plan (Plan) was prepared for the period of 2024-2029 to meet the following goals:
- Respond to regulatory and safety concerns
- Maintain and replace existing aging assets
- Protect public health and environment
- Embrace a policy of sustainability for the responsible use of existing resources The plan categorized projects into three (3) priority levels ranging from most to least critical for implementation. The plan is intended to be updated each year as projects and needs progress and change. The SAM Board of Directors requested the plan to be sent back to the member agencies with a request to update the plan with more specific project information that was lacking as part of the August 12, 2024, packet. The attached plan includes the updated information for the project summaries as requested.
The SAM Capital Improvement Program is comprised of four (4) system components including Pump Stations, Pipelines, the Wastewater Treatment Plan, and Outfall. Table 1 (below) shows the estimated costs for each component by fiscal year.
Table 1 also shows two total line items that are in conflict, the first being the estimated total of improvement which adds up to $18,681,000 over the next five (5) fiscal years (including 4% annual escalation). The second is a target total expenditure based on $2,500,000 annually as a baseline per SAM General Managers direction (also includes a 4% annual escalation). It is obvious that $2.5 million per year will not be sufficient based on SAM’s needs and the various project estimates.
509
Additionally, the SAM CIP includes IPS projects, such as the Montara Force Main. The City maintains that IPS improvements do not benefit the City sewer system and that, consistent with the JPA, City ratepayers are not obligated to pay capital replacement costs of a project that does not benefit them. This issue is subject to pending litigation, and we are currently scheduled for trial in July 2025. The City is asking the other member agencies to return to the settlement table to end the stalemate over the IPS and to revise the JPA.
Acceptance of the SAM CIP does not directly approve any funding for capital projects beyond the adopted FY 2024-25 SAM Operations and Maintenance Budget. The estimated totals for future fiscal years are a good indicator of proposed infrastructure funding requests to come in future budget cycles from SAM. It is imperative that SAM and member agencies look for financing and grant funding sources, otherwise these costs would be passed on to the systems rate payers.
ATTACHMENT:
1. SAM 5-Year Infrastructure Plan (Proposed)
510
August 12, 2024
Agenda Item No: 4D
BOARD MEMBERS: M. Clark B. Dye P. Dekker
H. Rarback D. Ruddock K. Slater-Carter
ALTERNATE MEMBERS: S. Boyd J. Randle
J. Grant D. Penrose
SEWER AUTHORITY MID-COASTSIDE
Staff Report
TO: Honorable Board of Directors
FROM: Kishen Prathivadi, General Manager
SUBJECT: Discuss Proposed 5-Year Infrastructure Plan
Executive Summary
The purpose of this report is to discuss the proposed 5-Year Infrastructure Plan Fiscal Impact
The fiscal impact of the proposed Infrastructure plan is $18.6 million spread over 5 years. Staff continue to investigate the possibility of any loans or grants for executing the mentioned projects in the Infrastructure Plan.
Strategic Plan Compliance
The recommendation complies with the SAM Strategic Plan’s Vision “Complete and fund an infrastructure master plan and make operational and maintenance changes to achieve zero sewer spills with the Coastside area it serves” and Goal 5: Infrastructure, Operations and Maintenance.
Background and Discussion/Report
Staff prepared a Proposed 5-Year Infrastructure Plan (Plan) for the period 2024-2029.
The Plan was prepared by Staff primarily to meet the following goals:
• Respond to regulatory and safety concerns
• Maintain and replace existing aging assets
• Protect public health and environment
• Embrace a policy of sustainability for the responsible use of existing resources 138
511
August 12, 2024
Agenda Item No: 4D
BOARD MEMBERS: M. Clark B. Dye P. Dekker
H. Rarback D. Ruddock K. Slater-Carter
ALTERNATE MEMBERS: S. Boyd J. Randle
J. Grant D. Penrose
Staff categorized the projects into three priority levels listed from most to least critical for implementation. This is a Rolling Plan and can be updated each year as it progresses.
The proposed Plan has been attached for discussion.
Staff discussed with Member Agency Managers and Engineers on July 19, 2024, and there were minor comments. These have been incorporated in the Proposed Infrastructure Plan.
The Board has two options:
1. Approve as it is
2. Send it to Member Agencies for discussions at their board/council and bring it back to the board later
Staff Recommendation:
Staff recommends the Board approve the Infrastructure Plan as it is.
Supporting Documents
Attachment A: Proposed 5-Year Infrastructure Plan
139
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1667 SUNNYVALE AVENUE, WALNUT CREEK, CA 94597-1861 1 |P A G E T 925-935-8628 C 925-997-6992 E [email protected] William K. Faisst, Consulting Engineer Inc.
September 9, 2024
Technical Memorandum
To: Kishen Prathivadi, P.E, PMP, General Manager
From: William K. Faisst, Ph.D., P.E., William K. Faisst Consulting Engineer, Inc.
Subject: Sewer Authority Mid-Coastside Five-Year Capital Improvement Program Executive Summary
This Technical Memorandum (TM) presents the proposed five-year (5-yr) Capital Improvement Program (CIP) for Sewer Authority Mid-Coastside (SAM) for fiscal years (FY) 2024/2025 through FY 2028/2029. The CIP addresses SAM’s near-term needs for capital work recognizing three priority categories; in addition, it identifies projects for which implementation may exceed currently targeted funding but are needed to meet regulatory requirements and one project for which SAM now seeks grant funding from Federal Emergency Management Agency (FEMA). • Category 1 – Regulatory and Safety (first priority with available funding) • Category 2 – Replacement and Rehabilitation (essential but deferred pending funding) • Category 3 – Sustainability/Energy/Optimization (desirable but deferred until more funding becomes available)
To prepare this CIP, in accordance with its contract with SAM, William K. Faisst Consulting Engineer, Inc. (WKFCE) assembled information from past reports or draft reports to SAM, historical SAM CIPs and draft CIPs and input received from SAM staff and its consultants. With one exception, WKFCE prepared neither any new independent assessment of assets’ condition nor independent cost estimates. The exception is potential work for submarine outfall inspection and maintenance for which WKFCE reviewed the most recent diver’s inspection report and developed current cost for repairs with input from an experienced local diving contractor and the diffuser discharge check valve manufacturer. In general, this TM presents updated CIP project costs to Winter 2024 costs based on construction cost indices increase from the date of original estimate preparation. Several projects have costs adjusted from other SAM reports. The 513
2 | P A G E
estimates include market place adjustments from recent SAM bids and contractors and typical allowances for soft costs. Soft costs are those cost required for a project’s planning, design, permitting, construction oversight, and administration.
As a target annual expenditure, SAM management directed WKFCE to start with $2.5 million for fiscal year 2024/2025 and use 4 percent annually for year-to-year inflation for the next four years.
Hence, this TM presents Winter 2024 costs escalated forward to the expected implementation fiscal year. Table ES-1 presents the proposed resulting five-year SAM CIP, where about $13.54 million was the total 5-year target expenditure. Attachment B presents more detailed information about proposed CIP projects.
To comply with regulatory requirements and prudent maintenance of existing assets, over the next five years SAM will spend most of its capital investment on replacing the SAM Sewer Force Main in Montara, a project developed to meet regulatory requirements. SAM classifies this work as a Category 1 project. Based on comprehensive evaluation carried out by SAM consultants, that pipeline has reached the end of its useful life. A new parallel pipeline, constructed of high-density polyethylene pipe (HDPE), will extend that asset’s service life by at least 50 years. Sam already has constructed about 3,500 feet of this pipeline. SAM plans to expend other funds to continue upgrades to its pump stations for Category 2 projects and to the wastewater treatment plant with several Category 2 and Category 3 projects. SAM also will carry out repairs to its effluent outfall (a Category 2 project). The total required expenditure of $18.68 million exceeds the target budget presented above but SAM management thinks that the condition of existing facilities warrants higher expenditures over the next 5 years, to continue to achieve regulatory compliance while protecting public and staff health and safety and SAM facilities integrity. 514
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Table ES-1. Sewer Authority Mid-Coastside Five-Year Capital Improvement Program
System Component
Cost (thousand dollars)1
24/25 25/26 26/27 27/28 28/29 Total
Pump Stations 1,352 1,406 328 3,086
Pipelines2 3,000 3,510 3,650 2,050 1,710 13,920
Wastewater Treatment
Plant 460 725 1,185
Outfall 490 490
Total 3,000 3,510 5,002 3,916 3,253 18,681
Target Total 2,500 2,600 2,704 2,812 2,925 13,541
Notes:
1 Total costs include 4% yearly escalation for years after FY 24/25. 2 Force Main in Montara Rehab exceeds target CIP funding but required largely to meet a regulatory requirement.
Introduction
SAM collects, conveys, treats and disposes of raw sewage from Montara Water and Sanitary District (MWSD), Granada Community Services District (GCSD), and the City of Half Moon Bay (HMB). Figure 1 shows the general SAM service area. SAM endeavors to be a well-run utility which successfully delivers required services and meets regulatory requirements. Coincidently SAM manages its assets to operate reliably, safely, efficiently, and cost-effectively. In September 2024, SAM engaged WKFCE to prepare this CIP, to document capital expenditures needed over the next five years, to support safe, reliable and efficient utility operations. 515
4 | P A G E
Existing Facilities and Recent Improvements
The SAM system include conveyance (collection, pumping, and transmission of raw sewage from member agency facilities), full secondary treatment at the SAM Wastewater Treatment Plant (WWTP) and effluent discharge through a submarine effluent outfall and diffuser.
Pump Stations
• Montara
• Princeton
• Portola
• Vallemar (operation only – owned by MWSD)
Pipelines
• Force Main in Granada
• Force Main in Montara
• Force Main in Princeton
• Interceptor in Granada
• Interceptor in Montara
Wastewater Treatment Plant
Preliminary Treatment, Influent Pumping, Primary Treatment, and Secondary Treatment with Effluent Disinfection and Pumping Grit and Solids Treatment (e.g., sludge anaerobic digestion) and Dewatering.
The WWTF has a permitted dry weather capacity of 4 million gallons per day (mgd) and a wet weather capacity of 15 mgd.
Effluent Outfall
Includes onshore and offshore reinforced concrete pipeline terminating in a 238-ft long multiport diffuser
Over the past decade, SAM and its consultants have reviewed and assessed its facilities condition carefully and thoroughly, identifying multiple potential projects required to maintain safe operability. These projects address the general age of facilities (e.g., are they obsolete such as spare parts no longer available), wear and tear, and operational challenges and regulatory compliance. SAM has implemented or now is implementing projects to address its most pressing challenges including:
Pump Stations—Key recent PS projects include:
• Replacement of Princeton PS (under construction as of Spring 2024) 516
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Pipelines—Key recent pipeline projects include:
• Replacement of SAM Sewer Force Main in Granada
• Replacement of about 3,600 linear feet of SAM Sewer Force Main in Montara (out of 16,750 total linear feet)
Wastewater Treatment Plant—Key recent or ongoing projects at the WWTP include:
• Enhanced flood protection
• New raw sewage screens
• Activated sludge aeration system rehabilitation
• Digester rehabilitation
• Primary clarifier rehabilitation
• Secondary clarifier rehabilitation
• Replacement standby generator (now in advanced planning/funding) 517
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Figure 1. SAM Service Area
518
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Five-Year Capital Improvement Plan
SAM has developed CIPs previously but the most recent CIPs have covered shorter planning horizons at its Board of Directors’ (BOD) preference. This CIP covers the next five years as requested by SAM.
Methodology
For this CIP WKFCE worked with SAM staff, consultant representatives, consultant reports, and past CIPs (some of which SAM never adopted), to identify assets and estimate associated capital projects. As SAM has done historically, this CIP identified and classified projects in three categories, in order of priority for implementation. CIP budgeting does not include costs for routine maintenance.
Category 1 – Regulatory and Safety: This category focuses on projects that will help ensure that SAM remains in full regulatory compliance. These projects will improve operational safety, reduce air emissions and pollutant discharges to water of the United States, protect public safety, and prepare to meet future and likely more stringent regulations. Category 1 project have the highest priority. SAM has little or no control to defer.
Category 2 -- Replacement and Rehabilitation: This category focuses on renewal or replacement of SAM’s aging infrastructure. Example projects replace equipment that has met or exceeded its useful life, has a previous failure history, or is obsolete as evidenced by spare parts unavailability or procurement difficulties. The goal is to provide for ongoing or future renovation activities. Typical Category 2 projects include:
• Mechanical equipment replacement, upgrade, or modernization • Pipeline renewal/replacement
• Electrical equipment (e.g., switch gear and distribution) replacement • Instrumentation/control equipment replacement, upgrade, or modernization SAM has moderate level of control over implementation timing for Category 2 projects.
Category 3 – Sustainability/Energy/Optimization: This category focuses on projects that optimize existing operations and/or improve energy efficiency and sustainability.
SAM has a goal of upgrading and improving its infrastructure over time, to prevent major failures while operating with reduced energy use and lower overall maintenance costs.
SAM has significant level of control over implementation timing for Category 3 projects. 519
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CIP Summary
Table 1 presents the proposed 5-yr CIP, using a combination of recommended Category 1, Category 2 and some Category 3 projects. Table 2 presents all identified projects. For each such project, we give a brief description, its past category rating, and an estimated cost in current (Winter 2024) dollars. Attachment A describes the accuracy for current estimated construction costs and soft cost (engineering, legal, and administration). The estimates presented herein are AACE International Class 5 estimates, also referred to as order-ofmagnitude estimates, with an expected accuracy range of minus 50 percent to plus 100 percent or sometimes to tighter range of minus 30 percent to plus 50 percent. We have reduced the accuracy range slightly since site conditions and characteristics are well known. The construction cost estimates include a contingency allowance of about 35 percent. Attachment B presents more detailed information about proposed CIP projects.
Summary
This 5-yr CIP identifies sufficient Category 1, Category 2, and Category 3 projects to use all planned expenditures--$12.5 million in winter 2024 dollars. Owing to the pressing need to rehabilitate the SAM sewer force main in Montara and also carry out other pressing projects, total proposed expenditures exceed the $2.5 million per year (with inflation equal to $13.541 million) by $5,140 million. Table 2 lists all proposed projects. At the WWTP SAM has identified a need to install a new standby generator and new electrical equipment. Both installations will occur near the administration building at a location outside the area of the WWTP at risk for flooding. That Category 1 work has a high priority but currently no schedule because SAM has initiated actions to acquire grant funding for detailed design and construction. 520
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Table 1. Sewer Authority Mid-Coastside Five-Year Capital Improvement Program
System Component
Estimated Cost (thousand dollars)1
24/25 25/26 26/27 27/28 28/29 Total
Pump Stations 1,352 1,406 328 3,086
Pipelines2 3,000 3,510 3,650 2,050 1,710 13,920
Wastewater Treatment
Plant 460 725 1,185
Outfall 490 490
Estimated Total 3,000 3,510 5,002 3,916 3,253 18,681
Target Total 2,500 2,600 2,704 2,812 2,925 13,541
Notes:
1 Total costs include 4% yearly escalation for years after FY 24/25. 2 Force Main in Montara Rehab exceeds target CIP funding but is required largely to meet a regulatory requirement.
521
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Table 2. SAM 5-Yr Capital Projects
Facility Category Description (implementation fiscal year) Estimated Cost (thousand dollars)1
Montara
Pump Station
811 Standby generator replacement (FY26/27) 811
541 Flowmeter replacement (FY26/27) 541
Portola Pump
Station
844 Standby generator replacement (FY26/27) 811
562 Flow meter replacement (FY26/27) 541
328 Wetwell concrete evaluation and rehabilitation
(FY27/28) 300
Force Main in
Montara2
10,160 Replacement of force main, with necessary
appurtenances (FY24/25 – FY26/27)
10,160
Force Main in
Princeton
3,760 Replacement of force main, with necessary
appurtenances (FY27/28 – FY28/29) 3,760
WWTP
260 Grit blowers upgrade/replacement (FY27/28) 260
100 Study of sludge beneficial uses (FY27/28) 100
100 Study of biogas beneficial uses (FY27/28) 100
725 Belt filter press refurbishment (FY28/29) 725
Outfall 490 Outfall inspection and repair (FY28/29) 490 Total 18,681
Notes:
1 Total costs include 4% yearly escalation for years after FY 24/25. 2 Force Main in Montara Rehab exceeds target CIP funding but required largely to meet a regulatory requirement. 522
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References
Global Diving & Salvage, Inc. Annual Outfall Inspection for Sewer Authority MidCoastside. August 17, 2022.
SRT Consultants. Draft Technical Memorandum, Montara Force Main Rehabilitation Alternatives Analysis—Board Draft Review. October 2023.
TJC and Associates. Technical Memorandum: Replacement and Relocation of Electrical Service Equipment. March 4, 2022.
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ATTACHMENT A
COST ESTIMATE ACCURACY
WKFCE, with assistance from SAM, assembled cost estimates presented in the Capital Improvement Program (CIP) for general master planning/budgeting purposes. Final costs of a project will depend on several factors including the final project scope, costs for labor and materials, and market conditions during construction. For cost estimating purposes, engineers working on public utility projects typically reference guidance from AACE International (formerly the Association for the Advancement of Cost Engineering International). AACEI has defined three ranges for assessing project costs. Presented in order of increasing accuracy these classifications are: Order of Magnitude, Budget, and Definitive. Within these three broad classifications AACEI uses five classes for estimates based on the level of available information.
Order of Magnitude Estimate. This Class 5 estimate, also known as an “original estimate”, “study estimate”, or “preliminary estimate,” is generally intended for master plans and studies such as a capital improvements plan. Detailed engineering data about the specific project does not support this estimate; its accuracy is dependent on historical data and cost indexes. Order of magnitude costs have an accuracy within -50 percent to +100 percent. The estimator could reduce this range based on project specific knowledge, for example, to -30 percent to + 50 percent if facilities already exist on a site, i.e., site conditions are well known. Thus, the estimator already might have geotechnical knowledge so the proposed project would have very little or no geotechnical/bad foundation condition risks.
Budget Estimate. This classification is also known as an “official estimate” and generally intended for predesign studies. An engineer or estimator prepares this estimate using flow sheets and equipment layouts and details. The reader generally expects that this estimate would have accuracy within -15 percent to +30 percent.
Definitive Estimate. An estimator prepares this classification, also known as a “final estimate,” during the time of contract bidding. The data include complete plot plans and elevations, equipment data sheets, and complete specifications. Generally, this estimate has an accuracy within -10 percent to +15 percent while carrying a contingency allowance of 10 to 15 percent.
Figure A-1 shows a graphical representation for the AACEI estimate classes and their key characteristics. The reader should consider that costs developed in SAM’s CIP are “Order of Magnitude” and have an expected accuracy range of -30 percent and +50 percent. A reasonable contingency allowance is 40 percent given the unknowns.
For capital budgeting purposes, presented costs should include allowances for engineering, legal and administrative costs, sometimes referred to as “soft costs.” Cost presented for CIP projects include several allowances, totaling 25 percent of construction costs with contingencies. Table A-1 presents a soft costs breakdown by category. Note that these percentages are typical and will vary project to project. For example, a project with major California Coastal Zone or environmental issues might have higher permitting costs while a small project often has higher design costs relative to its construction costs. 524
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Table A-1. Allowances for “Soft Costs”
Item Allowance of estimated construction
cost (percent)
Planning 2
Design 10
Engineering services during construction 2
Construction management and inspection 8
Legal, permitting and administrative
support
3 Total 25
525
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Figure A-1. Comparison of Different AACEI Cost Estimate Classes—Accuracy Range and Typical Contingency Allowance
526
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ATTACHMENT B
PROJECT SUMMARIES
Attachment B presents concise summaries for SAM’s proposed 5-Year FY 2024/2025 through FY 2028/2029 Capital Improvement Plan (CIP) and for one project not yet schedule within the CIP. The summaries briefly describe proposed work, each project’s justification, and its budget and schedule. Projects includes conveyance system (force mains and pump station), the wastewater treatment plant (WWTP), and the submarine effluent outfall. This CIP does not propose funding the replacement of WWTP Standby Generator, Automatic Transfer Switch, and Electrical Switchgear since SAM is pursuing FEMA funding for that project.
Table B-1. Summary of SAM’s Proposed FY 24/25 through 28/29 Capital Projects Facility Description Category Page
Montara Pump
Station Replacement of Standby Generator 2 B-2
Montara Pump
Station Replacement of Flow Meter 2 B-3
Portola Pump Station Replacement of Standby Generator 2 B-4 Portola Pump Station Replacement of Flow Meter 2 B-5
Portola Pump Station Wetwell Evaluation and Rehabilitation 2 B-6 SAM’s Force Main in
Montara Replacement Owing to Known Deterioration 1 B-7
Princeton Force Main Potential Replacement for Possible Deterioration 2 B-9
WWTP Upgrade/Replacement of Grit Blowers 3 B-11
WWTP Study of Sludge Beneficial Uses 3 B-12
WWTP Study of Biogas Beneficial Uses 3 B-13
WWTP Belt Filter Press Refurbishment 2 B-15
Outfall Submarine inspection and repair 2 B-17
WWTP
Replacement of Standby Generator, Automatic
Transfer Switch, and Electrical Switchgear (not
schedule pending potential FEMA funding)
1 B-19
527
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SEWER AUTHORITY MID-COASTSIDE
5-YEAR CAPITAL IMPROVEMENT PLAN FY 2024/2025 – 2028/2029 CATEGORY 2 – REPLACEMENT AND REHABILITATION
Project: Replacement of Montara Pump Station Standby Generator Priority: Replacement and Rehabilitation
At the Montara Pump Station (PS), this project will install a new diesel-fueled standby generator in place of the existing generator. The existing generator is old, installed in about 1979 and obsolete; it has reached the end of its useful life and hence, SAM plans to replace it.
Project: Montara Pump Station Replacement Standby Generator CIP Total Cost: $750,000 (Winter 2024 Estimate)
Project Funding: SAM will fund this project from SAM’s Infrastructure Program Basis of Priority: This project ranks as Category 2 because the existing equipment is old and has reached the end of its useful life.
Annual Cost Distribution (Winter 2024 thousand $’s) and Not Scheduled CIP Total FY 24/25 FY 25/26 FY 26/27 FY 27/28 FY 28/29
811 -- -- 811 -- --
Figure B-1 Montara Pump Station Generator
528
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SEWER AUTHORITY MID-COASTSIDE
5-YEAR CAPITAL IMPROVEMENT PLAN FY 2024/2025 – 2028/2029 CATEGORY 2 – REPLACEMENT AND REHABILITATION
Project: Replacement of Montara Pump Station Flow Meter Priority: Replacement and Rehabilitation
At the Montara Pump Station (PS), this project will install a new magnetic flow meter. The existing flow meter is old, installed in 1984, and obsolete; it has reached the end of its useful life and hence, SAM plans to replace it. The current flow meter installation is not compatible with the best reading accuracy. This project will evaluate alternative flow meter configurations, including a new vault for a potential increase in accuracy.
Project: Montara Pump Station Flow Meter
CIP Total Cost: $500,000 (Winter 2024 Estimate)
Project Funding: SAM will fund this project from SAM’s Infrastructure Program Basis of Priority: This project ranks as Category 2 because the existing equipment is old, and has reached the end of its useful life. The current flow meter installation is less than ideal for best flow measurement accuracy.
Annual Cost Distribution (Winter 2024 thousand $’s) and Not Scheduled CIP Total FY 24/25 FY 25/26 FY 26/27 FY 27/28 FY 28/29
541 -- -- 541 -- --
Figure B-2 Montara Pump Station Flow Meter
529
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SEWER AUTHORITY MID-COASTSIDE
5-YEAR CAPITAL IMPROVEMENT PLAN FY 2024/2025 – 2028/2029 CATEGORY 2 – REPLACEMENT AND REHABILITATION
Project: Replacement of Portola Pump Station Standby Generator Priority: Replacement and Rehabilitation
At the Portola Pump Station ((PS), this project will install a new diesel-fueled standby generator in place of the existing generator. The existing generator is old, installed in 1978 and obsolete; it has reached the end of its useful life and hence, SAM plans to replace it.
Project: Portola Pump Station Replacement Standby Generator CIP Total Cost: $750,000 (Winter 2024 Estimate)
Project Funding: SAM will fund this project from SAM’s Infrastructure Program Basis of Priority: This project ranks as Category 2 because the existing equipment is old and has reached the end of its useful life.
Annual Cost Distribution (Winter 2024 thousand $’s) and Not Scheduled CIP Total FY 24/25 FY 25/26 FY 26/27 FY 27/28 FY 28/29
844 -- -- -- 844 --
Figure B-3 Portola Pump Station-Generator
530
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SEWER AUTHORITY MID-COASTSIDE
5-YEAR CAPITAL IMPROVEMENT PLAN FY 2024/2025 – 2028/2029 CATEGORY 2 – REPLACEMENT AND REHABILITATION
Project: Replacement of Portola Pump Station Flow Meter Priority: Replacement and Rehabilitation
At the Portola Pump Station ((PS), this project will install a new magnetic flow meter. The existing flow meter is old, installed in 1984, and obsolete; it has reached the end of its useful life and hence, SAM plans to replace it. The current flow meter installation is not compatible with the best reading accuracy. This project will evaluate alternative flow meter configurations, including a new vault for a potential increase in accuracy.
Project: Portola Pump Station Flow Meter
CIP Total Cost: $500,000 (Winter 2024 Estimate)
Project Funding: SAM will fund this project from SAM’s Infrastructure Program Basis of Priority: This project ranks as Category 2 because the existing equipment is old and has reached the end of its useful life.
Annual Cost Distribution (Winter 2024 $’s) and Not Scheduled CIP Total FY 24/25 FY 25/26 FY 26/27 FY 27/28 FY 28/29
584 -- -- -- 584 --
Figure B-4 Portola Pump Station Flow Meter
531
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SEWER AUTHORITY MID-COASTSIDE
5-YEAR CAPITAL IMPROVEMENT PLAN FY 2024/2025 – 2028/2029 CATEGORY 2 – REPLACEMENT AND REHABILITATION
Project: Portola Pump Station Wetwell Evaluation and Rehabilitation Priority: Replacement and Rehabilitation
At the Portola Pump Station (PS), this project will evaluate the wetwell interior concrete and if required owing to deterioration, rehabilitate it. As has occurred at the Portola PS, operators often observe concrete deterioration in raw sewage wetwells owing to sulfuric acid formation from hydrogen sulfide released from biological activity in the sewage; the acid attacks on both the concrete and reinforcing steel. The existing concrete is old, installed in 1978; it very likely has reached the end of its useful life.
Project: Portola Pump Station Wetwell Evaluation and Rehabilitation CIP Total Cost: $280,000 (Winter 2024 Estimate)
Project Funding: SAM will fund this project from SAM’s Infrastructure Program Basis of Priority: This project ranks as Category 2 because the existing equipment is old and has reached the end of its useful life.
Annual Cost Distribution (Winter 2024 $’s) and Not Scheduled CIP Total FY 24/25 FY 25/26 FY 26/27 FY 27/28 FY 28/29
328 -- -- -- -- 328
Figure B-5 Portola Pump Station Wetwell
532
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SEWER AUTHORITY MID-COASTSIDE
5-YEAR CAPITAL IMPROVEMENT PLAN FY 2024/2025 – 2028/2029 CATEGORY 1 – REGULATORY AND SAFETY PROJECTS
Project: Replacement of SAM’s Force Main in Montara (FMM) Priority: Regulatory and Safety
This project, part of SAM’s Intertie Pipeline System, is an essential pipeline that conveys wastewater collected in Montara, Moss Beach, Princeton-by-the-Sea, and El Granada to SAM’s wastewater treatment plant (WWTP) located in Half Moon Bay. The conveyance system uses a combination of force mains and gravity interceptors. The existing ductile iron pipe force main has served for over 40 years and has reached the end of its useful life. SAM verified past leakage and conducted a condition assessment. In addition, SAM is under a consent decree with the Environmental Rights Foundation (ERF) and United States Environmental Protection Agency (USEPA) to have the MFM completely rehabilitated by the end of FY 2026/2027.
Using high density polyethylene pipe (HDPE) SAM already has replaced two FMM sections:
1. 2,650 feet from the Montara Pump Station to end of Vallemar Street
2. 850 feet from the end of Vallemar Street downstream.
To complete the project, SAM needs to replace approximately 13,350 feet FMM, also planned with HDPE pipe.
Project: SAM’s Force Main in Montara
CIP Total Cost: $9,500,000 (Fall 2023 Estimate)
Project Funding: SAM will fund this project from SAM’s Infrastructure Program Basis of Priority: This project ranks as Category 1 because SAM must complete it to satisfy a consent decree and because owing to its seriously deteriorated condition, it presents a high public health and safety risk.
Annual Cost Distribution ($ thousand with inflation) and Schedule CIP Total FY 24/25 FY 25/26 FY 26/27 FY 27/28 FY 28/29
10,160 3,000 3,510 3,650 -- --
533
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Figure B-6 SAM’s Force Main in Montara (Highlighted)
534
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SEWER AUTHORITY MID-COASTSIDE
5-YEAR CAPITAL IMPROVEMENT PLAN FY 2024/2025 – 2028/2029 CATEGORY 2 – REPLACEMENT AND REHABILITAITON
Project: Replacement of SAM Princeton Force Main (PFM)
Priority: Regulatory and Safety
This project, part of SAM’s Intertie Pipeline System, is an essential pipeline that conveys wastewater collected in Princeton-by-the-Sea and conveys it to SAM’s Force Main in Montara which in turn conveys the Princeton-by-the-Sea raw sewage to SAM’s wastewater treatment plant (WWTP) located in Half Moon Bay. The existing ductile iron pipe force main has served for over 40 years and likely has reached the end of its useful life. Future evaluation will determine whether replacement is warranted in FY 2027/2028 and 2028/2029.
To complete the project, SAM needs to replace approximately 4,314 feet PFM, also planned with HDPE pipe.
Project: Princeton Force Main
CIP Total Cost: $3,300,000 (Winter 2024 Estimate)
Project Funding: SAM will fund this project from SAM’s Infrastructure Program.
Basis of Priority: This project ranks as Category 2 because SAM has not completed a recent condition assessment but the pipeline is suspect owing to its age.
Annual Cost Distribution ($ thousand with inflation) and Schedule CIP Total FY 24/25 FY 25/26 FY 26/27 FY 27/28 FY 28/29
3,760 -- -- -- 2,050 1,710
535
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Figure B-7 Princeton Force Main (Highlighted)
536
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SEWER AUTHORITY MID-COASTSIDE
5-YEAR CAPITAL IMPROVEMENT PLAN FY 2024/2025 – 2028/2029 CATEGORY 2 – REPLACEMENT AND REHABILITATION
Project: Upgrade/Replacement of the WWTP Grit Blowers
Priority: Replacement and Rehabilitation
At the wastewater treatment plant (WWTP), this project will remove the existing grit blowers and replacement them with new, higher capacity blowers using better technology. In2017, SAM carried out a planning study, updated in 2022, to evaluate existing facilities and recommend improvements described above.
Project: Upgrade/Replacement of the WWTP Grit Blowers
CIP Total Cost: $230,000 (Winter 2024 Estimate)
Project Funding: SAM will fund this project from SAM’s Infrastructure Program.
Basis of Priority: This project ranks as Category 2 because the existing equipment is outdated and ready for upgrade.
Annual Cost Distribution (Winter 2024 $’s) and Not Scheduled CIP Total FY 24/25 FY 25/26 FY 26/27 FY 27/28 FY 28/29
260 -- -- -- 260 --
Figure B-8-SAM Grit washers (Left), and Grit Blower (Right)(For Illustration) 537
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SEWER AUTHORITY MID-COASTSIDE
5-YEAR CAPITAL IMPROVEMENT PLAN FY 2024/2025 – 2028/2029 CATEGORY 3 – SUSTAINABILITY/ENERGY/OPTIMIZATION
Project: Study of Sludge Beneficial Uses
Priority: Sustainability/Energy/Optimization
At the wastewater treatment plant (WWTP), SAM currently dewaters anaerobically digested sludge and sends the dewatered sludge to landfill. This process uses valuable landfill space and ultimately generates methane, a significant greenhouse gas, as sludge degrades in the landfill. Such methane may release to the atmosphere. If SAM could develop a plan for beneficial sludge reuse, e.g., composting for use as a soil amendment, SAM’s sludge disposal activity could become beneficial, not detrimental to the environment. This study will determine how to best dispose of and/or recycle SAM’s WWTP sludge.
Project: Study of WWTP Sludge Beneficial Uses
CIP Total Cost: $90,000 (Winter 2024 Estimate)
Project Funding: SAM will fund this project from SAM’s Infrastructure Program.
Basis of Priority: This project ranks as Category 3 because it presents an opportunity to decrease SAM’s impacts to the environment and hence make the WWTP operations more sustainable.
Annual Cost Distribution (Winter 2024 $’s) and Not Scheduled CIP Total FY 24/25 FY 25/26 FY 26/27 FY 27/28 FY 28/29
100 -- -- -- 100 --
Figure B-9 Sludge Beneficial Uses (Sample)
538
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SEWER AUTHORITY MID-COASTSIDE
5-YEAR CAPITAL IMPROVEMENT PLAN FY 2024/2025 – 2028/2029 CATEGORY 3 – SUSTAINABILITY/ENERGY/OPTIMIZATION
Project: Study of Biogas Beneficial Uses
Priority: Sustainability/Energy/Optimization
At the wastewater treatment plant (WWTP), SAM currently digests a combination of primary and waste biological sludge anaerobically. This process produces biogas that SAM could use to fuel a cogeneration/combined heat and power system (aka, cogeneration--cogen). Cogen systems produce electricity which would offset electricity that SAM now purchases from the utility grid. Waste heat recovered from the power generation system would heat SAM’s anaerobic sludge digestors.
The added heat accelerates sludge digestion and ensure that the product sludge is more biologically stable and more easily recycled, while likely destroying pathogens in the sludge. This study will determine how to best to use SAM’s WWTP biogas.
Project: Study of Biogas Beneficial Uses
CIP Total Cost: $90,000 (Winter 2024 Estimate)
Project Funding: SAM will fund this project from SAM’s Infrastructure Program.
Basis of Priority: This project ranks as Category 3 because it presents an opportunity to decrease SAM’s impacts to the environment and hence make the WWTP operations more sustainable.
Annual Cost Distribution (Winter 2024 $’s) and Not Scheduled CIP Total FY 24/25 FY 25/26 FY 26/27 FY 27/28 FY 28/29
100 -- -- -- 100 --
[
539
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Figure B-10 Biogas production through sludge anaerobic digestion (For Illustration) 540
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SEWER AUTHORITY MID-COASTSIDE
5-YEAR CAPITAL IMPROVEMENT PLAN FY 2024/2025 – 2028/2029 CATEGORY 2 – REPLACEMENT AND REHABILITATION
Project: Belt Filter Press Refurbishment
Priority: Replacement and Rehabilitation
At the wastewater treatment plant (WWTP), this project will recondition and rebuild the existing belt filter presses currently used to dewater digested sludge. The existing presses were installed in 1998 and are worn but salvageable with replacement of key components and other reconstruction.
Project: WWTP Replacement Standby Generator and Electrical Switchgear CIP Total Cost: $620,000 (Winter 2024 Estimate)
Project Funding: SAM will fund this project from SAM’s Infrastructure Program.
Basis of Priority: This project ranks as Category 2 because the existing equipment is old and worn.
Annual Cost Distribution (Winter 2024 $’s) and Not Scheduled CIP Total FY 24/25 FY 25/26 FY 26/27 FY 27/28 FY 28/29
725 -- -- -- -- 725
541
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Figure B-11 Belt Filter Press
542
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SEWER AUTHORITY MID-COASTSIDE
5-YEAR CAPITAL IMPROVEMENT PLAN FY 2024/2025 – 2028/2029 CATEGORY 2 – REPLACEMENT AND REHABILITATION
Project: SAM Effluent Outfall and Diffuser Inspection and Repair Priority: Replacement and Rehabilitation
This project is an essential system component that conveys wastewater treatment plant (WWTP) effluent into the Pacific Ocean for ultimate disposal. The outfall includes about 1,000 feet of 66-inchdiameter reinforced concrete pipe (RCP) onshore and 900 feet of 66-inch-diameter RCP offshore terminating in a 238-foot-long multiple-port diffuser. The diffuser ports terminate with Tideflex® Check (aka “duckbill”) valves. A 2022 submarine inspection carried out by Global Diving and Salvage, Inc. (GDSI), found that all duckbill valves showed signs of damage; one (valve 33) out of 35 valves was buried completely and hence, not functioning. GDSI recommended that SAM consider duckbill valve replacement.
Project: Effluent Outfall and Diffuser Inspection and Repair CIP Total Cost: $420,000 (Winter 2024 Estimate)
Project Funding: SAM will fund this project from SAM’s Infrastructure Program Basis of Priority: This project ranks as Category 2 because SAM must maintain the outfall discharge system to dispose of WWTP effluent in compliance with SAM’s NPDES permit.
Annual Cost Distribution ($ thousand with inflation) and Schedule CIP Total FY 24/25 FY 25/26 FY 26/27 FY 27/28 FY 28/29
490 -- -- -- -- 490
543
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Figure B-12 Apparently buried and hence non-functional diffuser port 544
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SEWER AUTHORITY MID-COASTSIDE
5-YEAR CAPITAL IMPROVEMENT PLAN FY 2024/2025 – 2028/2029 CATEGORY 1 – REGULATORY AND SAFETY PROJECTS
Project: Replacement of the WWTP standby generator and electrical switchgear Priority: Regulatory and Safety
At the wastewater treatment plant (WWTP), this project will install a new diesel-fueled standby generator and new electrical switchgear in a new higher-elevation building adjacent to the existing administration building. The existing generator is old (1979) and obsolete and has reached the end of its useful life. Furthermore, it sits in an area with flooding risk. The key medium-voltage electrical switchgear dates from the 1990s, is obsolete and also has reached the end of its useful life, with equal flooding risk. In 2013, TJC and Associates, Inc., carried out a planning study, updated in 2022, to evaluate existing facilities and recommend improvements described above.
Project: WWTP Replacement Standby Generator and Electrical Switchgear CIP Total Cost: $6,000,000 (Winter 2024 Estimate)
Project Funding: SAM has applied for FEMA funding
Basis of Priority: This project ranks as Category 1 because the existing equipment is old and has flooding risk. It does not appear in the current CIP because SAM has applied for funding from FEMA which could reduce expenditures of SAM funds.
Annual Cost Distribution (Winter 2024 $’s) and Not Scheduled CIP Total FY 24/25 FY 25/26 FY 26/27 FY 27/28 FY 28/29
6,000 -- -- -- -- --
545
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Figure B-13 Potential Location for New Standby Generator and Electrical Switchgear 546
BUSINESS OF THE COUNCIL OF THE CITY OF HALF MOON BAY
AGENDA REPORT
For meeting of: October 15, 2024
TO: Honorable City Council
VIA: Matthew Chidester, City Manager
FROM: John Doughty, Assistant City Manager
Maz Bozorginia, Public Works Director
TITLE: STUDY SESSION—POTENTIAL COMMUNITY PARK ON BEACHWOOD/GLENCREE
PROPERTY
RECOMMENDATION:
Conduct a study session on potential use of the Beachwood/Glencree Property as a community park and direct staff accordingly.
FISCAL IMPACT:
There is no fiscal impact associated with this item. If directed, additional planning and environmental work to further evaluate community park options would require creation of a new Capital Project and allocation of General Funds.
STRATEGIC ELEMENT:
This recommendation supports the Healthy Communities and Public Safety and Inclusive Governance Elements of the Strategic Plan.
BACKGROUND:
On July 16, 2024, Mayor Jimenez requested City Council agree to the placement of an item on a future agenda regarding use of the Beachwood/Glencree property as a “community park”. The request was seconded by Councilmember Penrose.
The Beachwood/Glencree Property comprises two legal parcels of approximately 36 acres in size. The property is located east of Highway 1, between the Terrace Avenue and Grandview neighborhoods.
The property was subject to lengthy litigation which culminated in a United States District Court decision in November of 2007. The litigation centered around proposed development of singlefamily home community on lands with emerging seasonal wetlands. Monetary damages were awarded to the property owner(s). Upon payment of the monetary judgement, the City 547
received the Beachwood/Glencree Property by grant deed. The City continues to be the sole owner of the two parcels.
On February 5, 2019, the City Council adopted the City of Half Moon Bay Parks Master Plan.
This document serves as guidance to the Parks and Recreation Commission, Planning Commission, and City Council on expansion/renovation of existing parks and consideration of new park facilities.
Over the last several years, the City has actively sought grant funding to prepare proof of concept design for the Kehoe Drainage Basin. The basin includes the Beachwood/Glencree property as well as lands to the east and west. The Discussion section includes additional information on the potential use of Beachwood/Glencree for green infrastructure/stormwater management.
DISCUSSION:
Land Use Challenges and Constraints
Land Use Plan Policy. The Local Coastal Land Use Plan (LUP) designation of the Beachwood/Glencree property is Open Space – for Conservation (OS-CR). The LUP provides the following guidance for OS-CR properties.
“The OS-CR designation applies to lands intended for permanent conservation and are therefore not held in reserve for potential future development. Habitat protection, management and restoration as well as hazard avoidance are the primary uses. If found to be compatible, uses could include public trails, education, passive open space amenities, and grazing for fuel modification and/or ESHA enhancement. Green infrastructure implementation measures such as stormwater detention swales, groundwater recharge wells, de-channelization of channelized watercourses, and stormwater harvesting systems for reuse may support the primary intent for habitat restoration or reducing flood, erosion, and other hazards.”
Conclusion: A Local Coastal Land Use Plan Amendment would be required should the City pursue a community park project. Any Amendment would require approval by the Planning Commission and City Council and ultimately certification by the California Coastal Commission.
Presence of seasonal wetlands and wetland vegetation played a significant role in the litigation.
Site Constraints. As shown on the 2020 LUP Habitat Map (See Attachment 1), approximately 22 acres of the 36-acre total parcel area is classified as Coastal Freshwater Marsh (green shaded area), due to the widespread presence of interconnected seasonal wetlands. This designation was affirmed through a 2019 wetland delineation prepared in conjunction with fire fuel modification (goat grazing). Each year, the area is re-evaluated as part of the fire fuel management program as shown on Attachment 2, 2024 Vegetation Management and Fire Abatement Program HMB East Parcel. The goat grazing map identifies “No Grazing Area” 548
(green shaded area) which includes wetlands and riparian areas where no vegetation clearance or grazing is allowed. This protected habitat may vary slightly from the LUP mapping but is of slightly higher order of accuracy than the LUP Habitat Map.
LUP Policies 6-40 and 6-41 generally prohibit development in wetlands or within a 100-foot buffer around wetlands. Uses that may be allowed are limited to education and research activities, public trails, habitat restoration and temporary disturbance for installation of public utilities. The 22 acres of wetland plus required buffers significantly reduces developable area on the site and the location of the wetlands make consolidating developable area extremely difficult. In 2021, at the direction of the City Council, staff performed a feasibility analysis for affordable housing development on City-owned properties. The analysis included the Beachwood/Glencree site, 555 Kelly, and 880 Stone Pine.
It is also of note that vehicular access and parking would be difficult on this site. As shown on Attachments 1 and 2, wetlands extend along most of the Highway 1 frontage. In fact, the LUP map shows a continuous line of wetlands. A Class 1 bicycle/pedestrian path (Eastside Parallel Trail-North) is proposed along this frontage, in the Caltrans right-of-way, which would create potential vehicle/bicycle conflicts that would need to be addressed should vehicular access be established in this location. Other potential access routes include extension of Golden Gate Avenue from the north and/or south. Mapped wetland and buffer areas limit this access and assuredly any proposed access would be challenged by existing neighbors/neighborhoods.
There are other on- and off-site potential environmentally sensitive habitat areas (ESHA) that would likely limit access from the Grandview areas as well.
Conclusion: Mapped environmental constraints, LUP policies and vehicular access challenges, limit the land area and viability of the site for an active park space. A lower intensity use such as an interpretive walking trail with limited vehicle access is possible and could be combined with restoration and green infrastructure/stormwater improvements.
Parks Master Plan
Overview. Throughout the development of the Parks Master Plan, community members identified a need and desire for a “new” community park. The Master Plan notes that Smith Field Park is an existing “community park”, but is focused on organized field sports, including HMB Little League, Junior Giants, HMB Pirates and City recreational softball programming.
Recently, the City Council approved a Facilities Master Plan for Smith Field that looks to expand community/family park offerings and following approval, the City Council allocated funding to initiate design of Phase 1 improvements and a new water main to serve Smith Field within Wavecrest Road. Staff anticipates bringing the Coastal Development Permit for Smith Field Park this winter.
Site Evaluations. The Master Plan identified several potential sites for a “new” community park (Attachment 3). Sites evaluated include the Beachwood Site, Podesta/Silvera Site, Caltrans Mitigation Site, San Mateo County Landfill Site, and 880 Stone Road. Many of the sites share similar environmental/habitat constraints. The Beachwood Site (which includes Beachwood and 549
Glencree properties) was not included as potential “new” community park as it was noted that the property’s “habitat value makes this site suitable for a potential mitigation bank, or for consideration of passive uses.”
New Community Park. The Master Plan includes a Vision statement and desired amenities for a “new” community park. The amenities listed include playground(s), picnic and BBQ areas, large informal grass areas, recreation activities spaces (basketball, hard courts, pickleball, etc.), restrooms, natural spaces, adequate parking and circulation. The desired amenities conflict with land use limitations and policies of the LCLUP.
Conclusion: The Beachwood/Glencree property was analyzed in 2018 and excluded in 2019 as part of the Parks Master Plan adoption. Additional information on mapped wetlands and new LUP policies support and reinforce the exclusion of this site as a potential “new” community park.
Stormwater and Environmental Stewardship
The City’s adopted Capital Improvement Program (CIP) includes the Kehoe Watershed Enhancement and Environmental Stewardship Project (CIP No. 1017). This project is a multifaceted approach to provide enhancement of the Environmentally Sensitive Habitat (ESHA) through implementation of green stormwater improvements to support the Kehoe Watershed.
The concept is to include stormwater retention facilities in appropriate locations within the Beachwood/Glencree property to support wetland habitats and reduce sediment transport, erosion and scouring along the Kehoe Watershed. This would also increase protection from scour of the Sewer Authority Mid-Coastside (SAM) wastewater treatment plant that is situated at the end of the Kehoe Watercourse.
CONCLUSION:
Utilization of the Beachwood/Glencree property is being considered for watershed management, which is a supported use for the property. Passive uses, such as pedestrian walkways and interpretative nature trails are also a supportive and permitted under a watershed project of this nature.
ATTACHMENT:
1) 2020 LUP Habitat Map
2) 2024 Vegetation Management and Fire Abatement Program HMB East Parcel 3) Parks Paster Plan Site Evaluations and Location Map
4) CIP Project Page – Kehoe Watershed (CIP No. 1017).
550
Grandview Blvd
Bancroft Ave
Pacific Ave
illo Hwy N
Cabrillo Hwy N
Cabrillo Hwy N
Grandview Blvd
Terrace Ave
Golden Gate Ave
Silver Ave
Terrace Ave
Highland Ave
Golden Gate
Silver Ave
Cabrillo Hwy
Terrace
Ave
Highland A
Non-native Grassland
Central Coast Riparian Scrub
Non-native Grassland
Coastal Freshwater Marsh
Coastal Freshwater Marsh
Monterey Cypress Forest
Coastal Freshwater Marsh
Central Coast Scrub
Coastal Freshwater Marsh
Monterey Cypress Forest
Central Coast Scrub
Coastal Freshwater Marsh
Coastal Freshwater Marsh
Eucalyptus Forest
Central Coast Scrub
Non-native Grassland
Central Coast Riparian Scrub
Coastal Freshwater Marsh
LUP Habitat Map
Esri Community Maps Contributors, County of San Mateo, California, California State Parks, © OpenStreetMap, Microsoft, Esri, TomTom, Garmin, SafeGraph, GeoTechnologies, Inc, METI/NASA, USGS, Bureau of Land Management, EPA, NPS, US Census Bureau, USDA, USFWS, Maxar
SAN MATEO COUNTY PARCEL DATA
Habitat Types
Urban
Non-native Grassland
Monterey Cypress Forest
Eucalyptus Forest
Coastal Freshwater Marsh
Central Coast Scrub
Central Coast Riparian Scrub
Agricultural
SIMPLIFIED CITY BOUNDARY
World Imagery
Low Resolution 15m Imagery
High Resolution 60cm Imagery
High Resolution 30cm Imagery
Citations
1.2m Resolution Metadata
10/7/2024
0 0.03 0.06 0.12 mi
0 0.05 0.1 0.2 km
1:4,495
551
552
553
554
Category: 1017
Project Location:
Type:
Initial Funding FY 23-24 Estimated Completion 152 Fund Name: Storm Drain Capital XX
PRIOR YEARS BUDGET
EXPENDITURES
FY 24-25 FY 25-26 FY 26-27 FY 27-28 FY 28-29 FUTURE YEARS TOTAL ALL FY $ 50,000 $ 300,000 250,000 $
$ 100,000 $ 900,000 800,000 $
$ 7,000,000 7,000,000 $ $ 350,000 350,000 $
$ - $ 150,000 $ - $ - $ - $ - $ 8,400,000 $ 8,550,000
PRIOR YEARS BUDGET
ALLOCATIONS
FY 24-25 FY 25-26 FY 26-27 FY 27-28 FY 28-29 FUTURE YEARS TOTAL ALL FY $ 100,000 $ 100,000
$ 50,000 $ 50,000
$ 8,400,000 $ 8,400,000
$ - - $ - $ - $ - $ - $ 8,400,000 $ 8,550,000 $
Fund Number:
DESCRIPTION:
image
This project is a multi-faceted project intended to provide environmental enhancement of designated Environmentally Sensitive Habitat (ESHA) to implement “green” basin-based storm water management for the Kehoe Watercourse, increase protection of the SAM Sewer Treatment Plant, and increase public access/stewardship opportunities.
InfrastructureHealthy Community/Public Safety
PROJECT TITLE: KEHOE WATERSHED ENHANCEMENT AND ENVIRONMENTAL STEWARDSHIP PROJECT Project Number:
East and West of Highway 1 at Old Bev Cunha Road Lead Department: Public Works Storm Water
Previously Approved
Engineering & Design
JUSTIFICATION:
The City conducted a hydrology/hydraulic study and identified broad recommendations for implementation.
Fiscal Sustainability ADDITIONAL DETAILS:
Inclusive Governance FY 23-24 funding is for feasibility and conceptual study. On-call geomorphology services will provide professional support on this project.
EXPENDITURES
STRATEGIC PLAN GOAL (please check all that apply)
Capital Maintenance/Community Enhancement Status:
TBD
TOTAL
Prof.Serv/Env.ConstructionPM-CM
TOTAL
UNFUNDED
SOURCE(S) OF FUNDS
General FundStorm Drain Improvement - Fund 152
555