1999 Harrison Street, Oakland, CA 94612
Tel 2805.542.9052 tetratech.com
June 12, 2026
Robert Ovadia, PE
Town of Atherton
80 Fair Oaks Lane
Atherton, CA 94027
Transmitted via e-mail: [email protected]
Reference: Amendment Request 2 for Individual Permit, Basis of Design, Alternative Analysis, and Section 106 Reporting for the Upper Atherton Creek Stabilization and Flood Mitigation Project
Dear Mr. Ovadia:
Below is a detailed description of the additional scope of work required as part of the Individual Permitting process directed by USACE and the Water Board during virtual discussion and emails from Sergio Redondo at USACE dated February 4, 2026, and from Jackson Fimrite from the RWQCB dated March 16, 2026.
SCOPE OF WORK
Task F.01. General Project Management
Tetra Tech will provide project management services that include ongoing coordination with the Town of Atherton (Town) to advance project objectives while balancing permitting, engineering, and environmental requirements.
We are requesting an additional lump sum fee of $30,634.00, for a new Task F.01 budget total of $36,678.
Deliverables:
• Four updated schedules
Task F.02. Progress Meetings
Tetra Tech will continue to attend regularly scheduled meetings. It is anticipated that the additional scope will result in eight additional bi-weekly meetings. We are requesting an additional lump sum fee of $5,112.00, for a new Task F.02 budget total of $12,567.
Deliverables:
• Attend eight bi-weekly meetings
Task F.03. Public Outreach Meeting
Tetra Tech will prepare a presentation describing the need for channel repairs, including creek stabilization and flood mitigation design. The presentation may include, but is not limited to, site photos, GIS figures, design plan sets and other available information to adequately present current conditions and need. The presentation will describe why this project requires an USACE individual permit and the steps needed to prepare the permit application and supporting documentation. Current conditions and state of the channel will be presented, along with current proposed project designs developed to achieve project and task goals. We are requesting an additional lump sum fee of $14,730.00, for a new Task F.03 budget total of $45,441.00.
Deliverables:
• Powerpoint Presentation and attendance of the Town Council Meeting. 2 TETRA TECH
Task C.01-C.05 Construction Documents (Landscape Plans):
If requested, Tetra Tech will prepare Planting Plans and Irrigation Plans, Specifications, and Estimates (PS&Es) for the drainage channel rehabilitation project to help support healthy, long-lasting landscape improvements. This scope will include planting plans, irrigation layouts, technical specifications, and cost estimates that are tailored to site conditions, drainage needs, and agency requirements. The planting design will focus on erosion control, durability, and the use of native or climate-appropriate species that after an establishment period, will not require regular watering. The goal is to remove irrigation after the establishment period to avoid the need for long term maintenance of the channel. The irrigation design will support plant establishment efficiently while keeping water use practical and compliant with project standards. All PS&Es will be coordinated with the overall rehabilitation design to help ensure the work is buildable, maintainable, and aligned with project goals. We are requesting a lump sum fee of $73,120.00 for a Task C Budget Total of $255,281.00.
Deliverables:
• Planting and Irrigation PS&Es at 65%, 95%, 100% milestones • Planting and Irrigation Final PS&Es Package for Bid.
Task C.06. Basis of Design Memo
The objective of this task is to provide an alternatives analysis that identifies the LEDPA. Tt WTR shall develop hydraulic models (e.g., HEC‑RAS 1D/2D as appropriate) for existing conditions and the proposed alternatives based on the 2015 NV5 Drainage Study. It should be noted that Tt WTR has previously prepared proposed alternatives and some hydraulic models per the Client’s direction, and the work proposed below will be to document that completed work and formally prepare a memo with Tetra Tech’s findings. Tetra Tech shall analyze the three (3) conceptual alternatives previously prepared – 1. Grading the Slopes, 2. 3’ Tall Retaining Wall plus bench and graded slopes, 3. 3’ Tall Retaining Wall plus bench) and one (1) do nothing alternative for the Atherton Creek. Tetra Tech will prepare a basis of design memo for the 3 conceptual alternatives and the 1 donothing alternative for the Atherton Creek, and include recommendations based on the engineering judgement of the Tt WTR team for this project. In addition, an ITR of all the models and memo will be performed prior to any formal submittal.
We are requesting a lump sum fee of $67,174 for this task.
Deliverables:
• Draft Basis of Design Memo
• Final Basis of Design Memo
Task I.09. Initial Study/ Mitigated Negative Declaration (IS/MND) Additional coordination will be required when developing the IS/MND for CEQA reporting, including alternative considerations, and mitigation plans and strategies. Tetra Tech also anticipates additional effort will be required to coordinate with the permitting agencies with respect to the project and IS/MND. We are requesting an additional lump sum fee of $12,454 for a new Task I.09 budget total of $108,617.
Deliverables:
• IS/MND
Task I.10. Environmental Assessment (EA)
Tetra Tech will prepare an EA in accordance with the National Environmental Policy Act (NEPA) of 1969, Executive Order 14154, and other applicable federal, state, and local environmental laws and regulations, as well as USCG Environmental Planning Policy (COMDTINST 5090.1). Deliverables will include a Description of the Proposed Action and Alternatives (DOPAA), along with a draft, public draft, and a final EA with one round of USACE and Town of Atherton review for each. The EA will describe the three alternatives including the proposed action, and the no-action alternative. The EA will include descriptions of issues, existing conditions, probable 3 TETRA TECH
impacts, and findings for all the environmental resources appropriate to the proposed project, including cumulative effects and mitigation measures, if required. The EA will address all relevant resource sections, including water quality, aesthetics, natural resources including threatened and endangered species, essential fish habitat, cultural resources, air quality, noise, land use, hazardous materials, and socioeconomics. Tetra Tech will prepare a “Comparative Assessment of Alternatives" table that compares the No Action and Action Alternatives in terms of their descriptions and impacts. The EA will include a section entitled “Regulatory Requirements”, which catalogs all federal, state, and local environmental laws and regulations that the USACE will be required to obtain for each alternative. Tetra Tech will compile documentation necessary to satisfy preparation of the EA. Following completion of the Final EA, Tetra Tech will prepare a Finding of No Significant Impact (FONSI) if no significant impacts are identified during the analysis. We are requesting a lump sum fee of $168,992 for this task.
Deliverables:
• DOPAA
• Draft EA
• Draft Public EA
• Final Public EA
• FONSI
Task I.11. Section 404(b)(1) Alternatives Analysis
Tetra Tech will prepare a 404(b)(1) water quality evaluation based on information known at this stage of the project and consistent with the consequences analysis. The evaluation will address how the proposed project would avoid, minimize, and mitigate (in that order) impacts to waters of the U.S. The evaluation will be consistent with Clean Water Act 404(b)(1) Guidelines (40 CFR 230) for alternatives analysis and will be included as an Environmental Appendix of the Draft EA. The evaluation will need to include a discussion of efforts the Town of Atherton has made to engage with landowners for the purpose of gaining support for use of the area adjacent to Atherton Channel. We are requesting a lump sum fee of $26,428 for this task.
Deliverables:
• Preliminary Draft Section 404(b)(1) analysis
• Draft Section 404(b)(1) analysis
• Final Section 404(b)(1) analysis
Task I.12. Functional Assessment and Mitigation Plan
Tetra Tech will prepare a functional assessment for before-and-after-mitigation conditions consistent with the California Rapid Assessment Method (CRAM). The functional assessment will require a field survey, completion of the CRAM before-and-after-mitigation spreadsheet, and will provide a final evaluation of the habitat units present under with and without project conditions. The information developed under this process will be used to propose mitigation ratios for affected wetlands and waters of the U.S., and to assist in developing a proposed mitigation plan.
The mitigation proposal will include a qualitative discussion of the functional characteristics of the affected resources, a quantitative summary of the functions of the affected resources, and a recommended plan to mitigate the impacts. The recommended plan will focus on developing mitigation opportunities within Atherton Channel, but will expand to areas outside of the channel if sufficient opportunities are not found there. The mitigation plan may include onsite habitat restoration, purchases of credits at a mitigation bank, and/or payment to an In Lieu Fee program, if available. We are requesting a lump sum fee of $49,549 for this task.
Deliverables:
• Up to six plan view GIS figures showing proposed planting plans, contouring, and streambed improvements at the 10% level of design.
4 TETRA TECH
Task I.12. Section 106 (Cultural Resources and Historical Architecture) Analysis Section 106 and CEQA Surveys, Reporting, and Agency Coordination A permit from the Corps would require compliance with Section 106 of the National Historic Preservation Act (NHPA), which requires the lead federal agency (e.g., the United States Coast Guard [USCG]) to assess and consider the effects of its undertakings on historic properties, including those listed on or eligible for the National Register of Historic Places (NRHP). The California Environmental Quality Act (CEQA; Section 21084.1) requires a lead agency to determine whether a project could have a substantial adverse change in the significance of a historical resource or Tribal cultural resources (Section 21084.2). In accordance with Section 106 of the NHPA and CEQA, Tetra Tech will conduct a Phase I archaeological investigation (field survey, reporting, and agency coordination) to assess whether the project would have the potential to affect historic properties or historical resources. The archaeological investigation will include incorporating the record search (already completed), California Native American Heritage Commission (NAHC) Sacred Lands File search (completed), lead agency coordination and consultation support as appropriate (e.g., Town of Atherton, US Army Corps of Engineers, State Historic Preservation Office (SHPO), archaeological survey, and technical reporting, as described below.
Archaeological cultural resource management services will be overseen by our Principal Archaeologist, Jenna Farrell, MA, RPA (Registered Professional Archaeologist). As an RPA with more than 20 years of experience in California, Ms. Farrell meets the Secretary of Interior’s Professional Qualifications for Archaeology and is a permitted Principal Archaeologist on our Cultural Use Permit for the U.S. Bureau of Land Management (BLM) and throughout several counties in California. Ms. Farrell has extensive experience with Section 106 and CEQA.
For the purposes of this scope of work and cost, the project area is defined as 1.5 miles by 100 feet width (18 acres).
Background Research
Tetra Tech conducted an archival, literature and records review of the project site. This action is not part of the scope.
Native American Heritage Commission (NAHC) and Tribal Coordination Tetra Tech staff conducted a Sacred Lands File search for the project through the NAHC to identify any documented Tribal cultural resources within the project or surrounding areas. The NAHC responded that the project is within sacred land and recommended reaching out to the list of Tribes. The NAHC provided a list of interested Tribal representatives. Tetra Tech will assist in preparing Tribal coordination or Assembly Bill 52 project letters and participate in up to two (2) one-hour conference meetings with Tribal representatives. Tetra Tech will also assist in maintaining a list of contacted Tribes and any responses.
Phase I Archaeological Survey
Tetra Tech archaeologists will conduct a Phase I archaeological pedestrian field survey of the project area (defined as 18 acres). In accordance with research design, a pedestrian survey will be conducted for the project area.
A pedestrian survey involves walking transects at set intervals based on State Historic Preservation Officer (SHPO) and lead agency requirements, and professional judgment of ground surface visibility in the field.
Transects for the survey are anticipated to be no more than 15 meters apart, the maximum transect interval suggested by SHPO. Digital photographs will be taken of the survey area. The field crew will inspect exposed ground surface for cultural materials, changes in soil color and texture, or other evidence of previous human occupation. Newly identified cultural resources will be documented to state standards on the appropriate State of California Department of Parks and Recreation (DPR) 523 Form. The site(s) will be photographed using digital cameras. All locational data will be recorded using Tablets/GPS receivers in Universal Transverse Mercator coordinates referenced to the North American Datum of 1983. Previously recorded cultural resource sites or potential cultural resources identified through the desktop study will be monitored for locational accuracy and updated to reflect any new observations, as appropriate. Newly completed DPR 523 forms will be submitted to the NWIC to obtain state resource numbers. The results of the pedestrian survey will be presented in a Phase I Technical Report.
Architectural Survey and Atherton Channel CRHR/NRHP Evaluation 5 TETRA TECH
Tetra Tech will conduct an architectural resource survey of the Atherton Channel (c. 1950s, historic era channel with features). The survey will be conducted by an architectural historian who meets the Secretary of Interior’s Professional Qualification Standards (36 CFR Part 611). The resource will be documented to state standards on the appropriate State of California Department of Parks and Recreation (DPR) 523 Form. The site(s) will be photographed using digital cameras. All locational data will be recorded using Tablets/GPS receivers in Universal Transverse Mercator coordinates referenced to the North American Datum of 1983. Newly completed DPR 523 forms will be submitted to the NWIC to obtain state resource numbers. The results of the architectural resource survey will be presented as part of the Phase I Technical Report. Reporting will follow guidance provided in CORPS’s Guidelines for Compliance with Section 106 of the National Historic Reservation Act (CORPS 2014) and will include a recommendation of NRHP eligibility for the resource based on a discussion of all four criteria and an integrity evaluation. A finding of adverse effect/no adverse effect will be included as appropriate.
Cultural Resource Phase I Technical Report
Tetra Tech will produce one draft and final confidential technical report of findings and recommendations meeting the standards of Section 106 of the NHPA, and SHPO’s Archaeological Resources Management Reports ARMR):
Recommended Contents and Format (OHP 19991). The report will include required front matter, an introduction describing the project and regulatory context, the objectives and methods of the survey, summary of precontact and historic context, record search results, field survey results, NRHP eligibility recommendations (based on surface expression), an assessment adverse effects, and management recommendations (i.e., avoidance measures, minimization, monitoring, etc.), and a list of references cited in the report (as applicable). Additionally, the report will include an appendix of completed DPR 523 forms (as applicable), NAHC and desktop study results and Tribal coordination, maps of survey coverage and any sites within or near the Project.
Tetra Tech will treat all information related to the archeological survey portion of this project as sensitive material that must be kept confidential. Tetra Tech will label all reports, maps, and diagrams as “Confidential” and “For Official Use Only.” The Technical Report will be used to draft the project CEQA IS/MND Cultural and Tribal Resource Sections and NEPA Environmental Assessment (EA) Cultural Resource Section (includes Tribal). We are requesting a lump sum fee of $41,589 for this task.
Deliverables:
• One draft and final project letters for Tribal coordination/consultation for up to 20 Tribal recipients. Draft will be submitted to Town of Atherton for review and comment. Only one round of comments for draft tribal letters are assumed.
• One Draft Phase I Technical Report in PDF and electronic format. The report will be submitted to the Town of Atherton and Corps for review and comment. Only two rounds of comments for the draft technical report are assumed. Once comments are received from the Town/CORPS, a final draft will be prepared.
• One Final Phase I Technical Report will be submitted to the Town of Atherton and the CORPS. • Tetra Tech will draft the Cultural and Tribal Resources Sections of the CEQA IS/MND and NEPA EA. No more than one round of responses and comments on the EA Cultural Resource Section.
Task K. Easements
We propose to prepare the necessary easement documentation for the nine properties currently impacted by the project, as required to support the proposed improvements through the drainage channel. A table of the impacted properties is provided below for reference. The easements will consist of temporary construction easements, permanent stormwater drainage easements, or a combination of both, depending on the needs of each property and the extent of the proposed improvements. The permanent easements will be used in locations where the proposed improvements extend beyond the limits of the existing easements. Each easement package will include a legal description and a corresponding plat, identified as Exhibit A and Exhibit B, respectively. This effort is intended to provide the property rights necessary to construct the improvements in the drainage channel without requiring field work. Should the project expand and impact additional properties beyond the current nine, a change order will be required to prepare the additional easements. We are requesting lump sum fee of $69,948.00 for this task.
6 TETRA TECH
APN Owner Name Address
073-220-270 Tung, James T. / Tse, Elaine K. 306 Walsh Rd, Atherton 073-220-260 Lagomarsino, Albert J. & Helen M. 24 Broadacres Rd, Atherton, CA 073-220-220 Elkus, Richard J. Jr Tr / Elkus Trust 328 Walsh Rd, Atherton 073-220-060 Shibumi LLC 93 Broadacres Rd, Atherton
073-220-400 Schmaier, Robert David & Sandra Lynn 336 Walsh Rd, Atherton 073-220-390 Clear Sky View LLC 338 Walsh Rd, Atherton
073-220-020 One Orchard LLC 346 Walsh Rd, Atherton
073-220-010 Twin Doors LLC 354 Walsh Rd, Atherton
073-203-060 358 Walsh LLC 358 Walsh Rd, Atherton
Deliverables
• 9 Legal Descriptions (Exhibit A): 8.5x11
• 9 Plats (Exhibit B): 8.5x11
Task L. Bid Support
Tetra Tech will provide support for the Town of Atherton in the following:
- Attend Pre-Bid Meeting: Tetra Tech will attend a pre-bid meeting, prepare a meeting agenda and summary, and one (1) addendum.
- Attend Pre-Bid Meeting: Tetra Tech will attend a pre-bid meeting, prepare a meeting agenda and summary, and one (1) addendum.
- Assist with Bid Questions: Tetra Tech will address up to ten (10) minor questions by prospective bidders, as well as up to two (2) major questions.
- Assist with Bid Evaluations: Tetra Tech will assist with bid evaluation of three (3) apparent lowest bidders to verify bid requirements are satisfied and to make an award recommendation to the Town. Provide a written recommendation to the Town.
- Prepare “As-Bid” Documents: Prepare “As-Bid” documents. Incorporate all changes to plans and specifications as documented in the addenda to the bid documents and prepare a set for the Town review. Changes to the specifications will be noted using a distinctive typeface and other means, as defined by the Town, to denote changes made to the specifications.
We are requesting lump sum fee of $14,164.00 for this task.
Deliverables
• Pre-Bid Meeting Agenda
• Addendum following Pre-Bid
• Draft “As-Bid” Documents
7 TETRA TECH
Task M. Construction Support
Tetra Tech will provide support for the Town of Atherton in the following, during construction. - Attend Weekly Construction Meetings (26): Tetra Tech will provide 1 design team member capable of answering contractor RFIs to bi-weekly construction meetings for 12 months, for a total of 26 meetings.
Tetra Tech will provide meeting minutes for each construction meeting. - Answer RFIs: Tetra Tech will respond to all official Requests for Information (RFI) in writing. Contractorgenerated RFIs will be submitted to the Town of Atherton Project Manager. The estimated level of effort for this task assumes twenty (20) RFIs, 10 for civil, and 10 for structural disciplines. - Submittal Reviews: Tetra Tech will review all submittals provided by the contractor. The estimated level of effort for this task assumes ten (10) submittals, 5 for civil, and 5 for structural disciplines. - Conduct Discipline Site Visits (Optional): Tetra Tech will conduct discipline site visits as an optional task to ensure construction is progressing as designed. Tetra Tech will provide two (2) civil site visits. - Assist with Change Orders and Plan Clarifications: Tetra Tech will assist the Town with the preparation of change orders and plan clarifications.
- Attend Pre-Construction Meeting: Tetra Tech will have a civil design engineer attend a one-day preconstruction conference to be held with the successful construction Contractor, Town personnel, and other relevant personnel.
- Produce As-Built Drawings: Following receipt by the Town of Atherton of an approved marked set of drawings from the Contractor after construction is complete, our team will incorporate all changes noted on the marked set within 60 days following receipt of the Contractor’s marked set. A combination of team members to produce and review the as-builts provided by the contractor.
We are requesting lump sum fee of $107,417.00 for this task.
Deliverables
• Construction Meeting Summaries & Meeting Minutes (26) • RFI Responses (20)
• Submittal Reviews (10)
• Civil Discipline Site Investigation Notes
• Change Order Documentation and Clarifications
• Final As-Built Drawings
Assumptions and Considerations
• All deliverables will be electronic and executable format. • Scope and fee estimate have been developed based on the knowledge and information available at the time of developing the scope. Required effort may change based on the review of the information provided. If further information becomes available during the scoping or project period, Tetra Tech reserves the right to request an update to the scope and fee. • Tetra Tech will be entitled to rely upon any information, data, and documentation concerning the project provided by the Town and other parties, or that shall be generally available, as well as any statements and representations made by the Town concerning projects or the services. In relying on such information, Tetra Tech shall have no obligation to investigate or independently verify the accuracy or completeness of such information.
• Assumes hydrology data will be based on the 2015 NV5 Drainage Study.
Task C.02-C.05 Assumptions
8 TETRA TECH
• Assumes one (1) Planting Legend/Notes Sheet, Four (4) Planting Plan Sheets. • Assumes one (1) Irrigation Legend/Notes Sheet, Six (6) Irrigation Plan Sheets, 3 Irrigation Details Sheets. • We assume that the waterline connection for the irrigation will be along Walsh Road. • Town of Atherton will provide comments on the Draft Revegetation Plan. • o Upon receipt of one set of consolidated, non-conflicting comments, Tetra Tech will prepare a • final Revegetation Plan revised based on comments received. • o If needed, Tetra Tech will participate in one conference call or meeting with the client to discuss • the comments.
Task C.06 Assumptions
• Basis of Design Memo – Assumes minimal CAD work for each alternative will be required. At most, the exhibit includes Plan View, Profile View, and Typical Sections for each alternative. Approximate level of 10% design.
• Basis of Design Memo – Assumes no construction estimate will be required for each alternative. • At the time of developing this scope and fee estimate, it was assumed that no construction drawings would be developed for the alternatives proposed.
Task F.03 Assumptions
• The presentation will include a maximum of eight slides. • Only current and available data will be used in developing the presentation. • Two Tetra Tech representatives will attend the presentation in person. • The Town will provide any audio-visual equipment needed for the presentation. Tetra Tech will provide a PowerPoint or PDF presentation to the Town prior to the meeting Task I.10 Assumptions
• One round of comments will be incorporated into each iteration of the EA. Additional rounds of comments may require budget modification. Budget does not include attendance for in-person meetings aside from the one site visit. The site visit will consist of observational data collection only. • Tetra Tech requires the results of the cultural resources survey and natural resource survey including information gathered about vegetation, wildlife, and hazardous materials observed at the site for inclusion in various sections of the EA.
• Tetra Tech requires details from USACE to draft the DOPAA and provide three alternatives, including construction equipment, timeline, and construction methods. • Any revisions to the project description or proposed design may result in revisions to the EA. If deemed necessary, Tetra Tech will submit a budget modification for any changes to the project description. • Tetra Tech will provide a limited supporting role for public involvement and has not included budget for drafting public involvement materials.
• Tetra Tech will provide records used to prepare the EA, but will not be responsible for compiling public comments for the administrative record.
Task I.11 Assumptions
• Any revisions to the project description or proposed design may result in revisions to the 404(b)(1) analysis. If deemed necessary, Tetra Tech will submit a budget modification for any changes to the project description.
• The Town of Atherton will provide a summary of efforts to engage with landowners to allow for implementation of green solutions for the flooding and conveyance issues, including a summary of the landowners’ responses.
Task I.12 Assumptions
• The functional assessment will require full access to Atherton Channel, both upstream and within the affected reach of the channel.
• The mitigation plan will be conceptual and will not include engineering design components including drawings, quantity calculations, or cost estimates.
• Additional design features are not included in this scope of work, or our proposed budget. 9 TETRA TECH
Task I.13 Assumptions
• No more than one Tribal outreach/consultation letter for up to 20 recipients will be produced on Town of Atherton letterhead and distributed by the Town.
• The project requires Section 106 of the National Historic Preservation Act and CEQA compliance. • Lead agency and Tribal coordination will be conducted via phone, email, etc., and an in-person meeting by the Project Archaeological staff will not be required. If an in-person meeting is requested, a cost and scope can be provided for the additional task.
• No more than four historical societies or museums that may have cultural resource information regarding the project site will be contacted, via telephone or email. • Tetra Tech will coordinate all required access approvals with the Town of Atherton at least two weeks prior to the field effort and will provide landowner approval documentation prior to the Phase I archaeological survey, to ensure full access to the survey area. This includes ensuring that landowners will not be conducting construction or application of pesticides during field activities that would preclude surveys.
• The archaeological survey will not exceed 18 acres. If additional acres are required, a scope and cost will be provided for the additional task.
• Slopes greater than 30 percent (16.7 degrees) will not be surveyed due to health and safety precautions and decreased probability for archaeological resources. • The Phase I pedestrian archaeological survey will be completed at a rate of 30 acres per person per day at 15-meter transects. The pedestrian survey will be completed by a two-person crew, including one Field Director. The Phase I pedestrian survey will be completed in one mobilization and require one field day. • The architectural resource survey will require one field day for one architectural historian plus travel. • No other resources besides the Atherton Channel will be documented as part of the architectural resource survey.
• Field days will be 10 hours long, including travel between lodging and the survey area. • Survey locations will be accessible from city/county/private and/or public roads and not restricted by property owners, impassable road segments, or locked gates not shown on available access maps. • No more than two isolated archaeological finds will require formal documentation. No previously recorded archaeological sites (identified by NWIC record search) will require field survey monitoring. If additional resources (e.g., archaeological sites) are identified or suspected, Tetra Tech will consult with the Town, and a change order may be necessary.
• This scope only includes one field mobilization and demobilization for the archaeological and architectural field survey.
• Additional agency input on survey protocols will not significantly increase the scope outlined in this proposal. If it is determined that additional field survey methods or formal NRHP-eligibility testing is necessary, or is requested by permitting agencies or SHPO, a specific scope and estimate for those services can be provided.
• There will be no unforeseen impediments to accessing the project area in a timely manner. The field survey will not be delayed due to locked gates, adverse weather conditions including a heat index over 90°, wildfires, site access constraints, unlawful landowners or public activity, threatening feral or domestic animals, or harvesting/herbicide application efforts to agricultural areas. If adverse weather conditions or other unforeseen circumstances cause a suspension or delay of field work, additional budget for additional survey days or remobilization may be required • This scope does not include formal CRHR/ NRHP eligibility evaluations of archaeological resources.
Recommendations of CRHR/NRHP eligibility will be provided based on surface observations of the site(s). If potential impacts to cultural resources cannot be avoided and cultural resources need to be formally evaluated for eligibility, Tetra Tech will include this in the recommendations in the technical report.
• Contracting with a Native American/Tribal monitor for the fieldwork is not included in this scope. If the Town of Atherton or Corps request Tetra Tech contract with a Tribe for monitoring during Phase I fieldwork, a scope and cost estimate will be submitted for this additional work. • This scope does not include collection of artifacts.
10 TETRA TECH
• This scope does not include archaeological site testing, data recovery excavations, or drafting mitigation plans or programmatic agreements or memorandum of understanding. If such study methods or documents are requested, a scope and cost can be provided. • This scope does not include the following study methods: the use of drones or unmanned aerial vehicles for aerial surveys, remote sensing, geoarchaeology studies, or satellite imagery use. If such study methods are requested, scope and cost can be provided.
Task K Assumptions
• Nine properties are currently impacted by the project and require easements. • Assume 1 easement and plat per property.
• Easements may include temporary construction easements, permanent stormwater drainage easements, or both.
• No field work is required.
• Each easement will include a legal description and plat, labeled as Exhibits A and B. • The easements are intended to facilitate construction of the improvements through the drainage channel. • Permanent easements will be prepared where proposed improvements extend outside existing easement limits.
• If the project expands and additional properties are impacted, a change order will be required to produce the additional easements.
Task L Assumptions
• No assumptions
Task M Assumptions
• The bi-weekly construction meetings will be arranged and coordinated by the Town of Atherton. • It is assumed that the bi-weekly construction meetings will last approximately one hour. • We have developed the fee based on a preliminary estimate of contractor RFIs, submittals, and change orders.
• Should the number of RFIs, submittals, and change orders exceed these assumptions, we will request additional budget.
• The budget is based on changes to 10 sheets at 4 hours per sheet for preparation of the As-Built Drawings.
• Final As-Built Drawings will be submitted electronically to the Town of Atherton. • This task is based on the preliminary design of a 3’ Tall Retaining Wall plus bench and graded slopes, and is subject to change.
FEE
Tetra Tech proposes to provide the additional environmental permitting and planning services outlined above for an additional Fixed Price (FP) fee of $681,207.00, and a new contract total of $1,427,585.00.
Please feel free to contact Mr. Eric Martin at (805) 801.6379, or via email at [email protected], if you have further questions or requests for additional information.
Sincerely,
Jason Fussel, PE, PLS, QSD/P, LEED AP, ENV SP
Vice President
Attachments: Price Proposal
11 TETRA TECH
Accepted by
Print Name
Title
Date
PrSic uemomTtlsra a/y
TPra kiscinTg oatls 681,207
iBl>et laR 394.00 221.00 283.50 183.75 110.25 394.00 394.00 289.00 221.00 173.00 273.00 221.00 152.00 131.00 221.00 205.00 152.00 142.00 121.00 147.00 273.00 221.00 152.00 175.00 150.00 SpecdidAfy'F l eoSne seutp 0 T echnoFels oeUgye
>A eorjraP liCvi CQ/AQ &HH &HH &HH latnemnroiEvn latnemnroiEvn roiEvnlatnemn latnemnroiEvn latnemnroiEvn latnemnroiEvn nimdA latnemnroiEvn latnemnroiEvn latnemnroiEvn sdna ceLpa aLsdn cepa 681,207 SubhtieTtomettd: Aroonw fo tn ConrtaTc ytpFe: ixePdr ice kssaT / seshaP jotcreP oFrm hTur Monhts 35,34 2038 18 72 396 4 179 146 309 198 164 144 474 553 16 8 6 6 8 15 52 72 105 126 252 66936,4 1274,3 - 00.0% - - 6812,07 1 2 3 4 5 9 10 11 12 13 15 16 17 18 20 21 22 23 24 26 28 29 30 32 33 triPme lavI.0uigddISi9-nIni /t IShMatDwi/nNi rMdDC(oN orse)temraPa - 86 - - - - - - - - - - - - 61 8 - 6 6 - 8 4 6 41 - - ,21 454 - - - ,21454- EIM 44 16 8 6 6 8 7,908 7,908
ECS 24 4 6 14 4,546 4,546
noitanirdCo odnganis Mtee 6918 27 - - - -61 21 46 - 21 - - 8 - - - - - 4 - - - - - ,74298 ,2084 - - - ,05273 aMn tnmancarleeGeogePet r10j .F 8 130 60 12 46 4 30,634 30,634 itesnoeePsMrsr (2gg0 .)8F 20 8 4 8 5,112 5,112
sndePeeart ietNo tncfooePr ojw 4T0n o.F foAhtt rne 46 4 12 10 12 8 12,146 2,480 14,626 MDosgmi eenfossi aPBSE s,& 737 -03 - - - 4 52 45 88 851 - - - - - - - - - - - - - 621 252 ,041492 - - - - ,041492 :Pmtlr ePiS%56ea 20tnpi.SCcs fe,iaictonE s&s itmas(e tPlaniirtargitnIo/gn) 261 8 5 8 80 160 43,506 43,506 P%09l 30a.nCpiScs fe,iaictonE s&s itms(ae tPlanitnirargitIo ,ng) 134 8 2 4 40 80 22,440 22,440P%001l 40a.nCpiScs fe,iaictonE s&s itms(ae tPlanitirargitIno ,ng) 26 8 2 4 4 8 5,340 5,340iF 50n.CalPl anpiScs fe,iaictonE s&s itms(ae tPlantirairgitIno ,ng) 10 4 2 4 1,834 1,834aBs 60i.Cso fsDe ingAn-lr eatitAvn ealysimeosM 106 2 4 8 22 22 48 24,694 24,694aBs 70i.Cso fsDe iyngdH-o rlovyRgei we 18 4 8 6 5,214 5,214aBs 80i.Cso fsDe iyngdH-a ruloMid lceino fgAnlr etaitvse 182 4 24 44 110 37,266 37,266 At lsnssseeamtnEPemNAvnEnr oi ,1830 - 4 - - - - - - - - 48 211 814 873 - - - - - 01 4 8 02 - - ,861299 - - - - ,861299 EDpNO ePP 01-Arae P.rAAI 108 20 20 40 26 2 19,660 19,660 IErP-.Ne DArP 11l aairfmEyi ntA 476- - - - - - - - - - 24 56 180 180 - - - - - 4 4 8 20 - - 76,356 - - - - 76,356 RWT 444 24 56 180 180 4 70,456 70,4 56SEC 32 4 8 20 5,900 5,900 ENPD a21-AErf . tAI 300 20 20 126 132 2 46,618 46,618ENiPF 31-A n.IalE A 154 4 20 16 72 40 2 26,358 26,358 y4lvAis ssta0i Sennac41(oAr)eniebt ()tl 851 - 4 - - - - - - - - 42 21 24 7 - 6 - - - - - - - - - - ,6224 8 - - - - ,62824 Da(404rf 41 tb.I)()1An alysis 100 16 8 26 5 0 16,638 16,638 iF 51n.aIl(404 b)()1An alysis 58 4 8 4 16 26 9,790 9,790 nPal noiMtgi taidnaA t lsnssseeamncointuF 732 - 8 - - - -81 - 14 - 44 02 41 19 - - - - - 1 - - - - - ,84945 ,1000 - - - ,94945 DauFrf 61 tn.itIconalAs ssesmnet 63 8 6 8 40 1 10,1 13 1,000 11 ,113 iF 71n.aIluF nitconalAs ssesmnet 26 4 4 2 6 10 4,64 0 4,640DaoCrf 81np t.euctIaliMi tagitonPl an 88 12 25 20 8 23 20,494 20,494iF 91n.aIloCnp euctaliMi tagitonPl an 60 4 6 16 12 4 18 13,302 13,302 1 0Snycl6oAeissait n 771 - 4 - - - - - - - - - - - - - - - - - - 4 4 85 17 - - 63 ,605 ,5380 - - - ,14985 itchoiseacFlSRenre e 0 2601d .I 53 24 2 4 5 12,616 5,083 17,699 itchoseacOSRenre 1 2601f f.iIec 36 6 10 20 6,888 6,888itcoeSAnn 2 2601 .alIysisan dpRe otr 88 4 14 24 46 17,002 17,002 s)eirte9p(Psr ot nemseEa 225 -63 81 27 693 - - - - - - - - - - - - - - - - - - - - ,9649 8 - - - - ,96849 agliLesDr 1e cp.Kitons 162 18 36 108 22,500 2 2,500
Pl 2a.Kst 342 18 36 288 42,345 4 2,345QAQC 18 18 5,103 5,103 rtopSp udiB -01 05 - - - -81 - 22 - - - - - - - - - - - - - - - - ,41461 - - - ,41461- -itiBePnerndAeegM dg a 8 2 2 4 2,114 2,114
-itiBePerndeM g 6 2 2 2 1,672 1,672Addnedfa ollowi-niBePr dg 7 1 2 4 1,893 1,893iBdQ usietonsan dE valuaitons 16 4 8 4 4,920 4,920AsDa"rf- iBtDdo uc"mnest 13 1 4 8 3,565 3,565 rtopSp uncorsiutCtno 153 -53 - - - 201 - 08 49 04 - - - - - - - - - - - - - - - ,89737 ,8086 - - - ,701714 oCnsuirttictoenunSeM gm maisre 79 13 26 40 21,957 21,957 sRep IoRFnsse 76 10 22 44 23,594 23,594uSbmiattvlRei wse 27 5 10 12 8,513 8,513iCvilDi sicpliVii Snes teit 55 1 16 18 20 16,147 7,440 23,58 7hCaDOnod urrcegemneatiton 41 1 16 24 11,829 11,829ocnePrsuirttictoenneMg 12 4 8 4,036 1,240 5,276iFnalAs -uBilDarw tinsg 61 1 4 6 10 40 12,661 12,661 otalsT 35,34 2038 18 72 396 4 179 146 309 198 164 144 474 553 16 8 6 6 8 15 52 72 105 00.0% 126 252 6639,64 172,43 - - - 6812,07 Pric iknsagT
dulhecSe oTtlsa
aWokDr y s
Off
aWokDr ysla toT srH Lbroa OCsD vaTerl iuEqp 'M&tla s bo raL irPincpalSuvr eyHeo rl t
(Hel)t
SuvreyM anage r
h(eCyrl)
SuvrehyeTnc iican
y(Cur)s
irPincpalnEg ine(keI re
aeP)c
orgarPmM ana(geA rir c
eorTryons)
nEg iSrne1e (rO lrando
opLe)s
nEgine3eO (irr E lcea)
nEgine2ie (rK m
Nguyen)
nEviornmenatl
orgarPpmM anage r
(nEviornmenatl
orgarPmM ana(g)eP) r
irPincpailSce nit ts
nEginie(reP irncpal
iScenniEtg itsne()eP) r
aiStScfef nit/tnsEginee r
(aSt IIff
iScenit/tnsEgin IeIe r
()P)
SpieS IcaGlS AIi(/C DGts
Spiecali()P) ts
M taeojrcAPn QEaCge r
M taeojrcAPn QEa(Cge r
)() E
irAPi nQEcpCal
iScenit/tnsEginee r
irAPi nQE(cpCal
iScenniEtg itsn)e() eE r
aiStScfef nit/tnsEginee r
(aSt IIff
iScenit/tnsEgin IeIe r
()E)
aiStScfef nit/tnsEginee r
(aSt Iff
iScenit/tnsEgi(n E eIe r
))
iAocsaset
iScenit/tnsEginee r
(iAocsaset
iScenit/tnsEgin)e() eE r
teojrcP Sr
Adminiart(eseLo tr
Houotns)
nEviornmenatl
orgarPpmM anage r
(nEviornmenatl
orgarPmM ana(geA r))
irPincpailSce nit ts
nEginie(reP irncpal
iScenniEtg itsne(eA r))
aiStScfef nit/tnsEginee r
(aSt IIff
iScenit/tnsEgin IeIe r
(A))
SeniaLo arndcspe
eisDgn(eSe rnio r
aLandcespisDe gne)r
aLandcespisDe gne r
(aLandcespisDe gne)r .csEet aR roLba
oPrTtilc ae
rPicing by eRsuorce
irPincpalnEg inee r
(JaoFunsesls )
M taeojrcPna1ge (irr E c
Maitrn)
Rsue ro52ce
Upper hetArno tCreek Sabtiliaitno zand ldoo FMiitgiatno rPejoc:t mAendme nt 2 Preics Plropao R e vi iasoe tDn: Jun 12, 2026 Labor Plan Tetra Tech - Confidential and Proprietary Page 1 of 1 Printed 6/12/2026