8-Attachment G Seawall RFP Detroit River Canals Final.docx

1. Introduction and Background The City of Detroit Office of Contracting and Procurement (OCP) on behalf of City of Detroit Human, Homeless, and Family Services - Bridging Neighborhoods (“City”) is soliciting Design-Build proposals from qualified firms to provide property assessment, engineering design, permitting support, and construction services for the evaluation, design, and construction, reconstruction, and/or repair of privately owned residential seawalls (bulkheads) serving properties in the Jefferson-Chalmers neighborhood, along canals connected to the Detroit River in Detroit, Michigan. This Request for Proposals (RFP) covers assessment of existing shoreline protection structures and, as warranted, the design and installation of new seawalls, and/or the repair or full replacement of existing seawalls. The selected Contractor should have expertise in design, engineering, permitting, construction, and construction administration of similar types of projects. The project will be overseen by Bridging Neighborhoods, a subdivision of the City of Detroit Department of Human, Homeless, and Family Services (HHFS).

The canal properties addressed by this RFP are subject to fluctuating Great Lakes and Detroit River water levels, ice action, wake and current erosion, and freeze–thaw cycles common to southeast Michigan waterfront properties. The City seeks a contractor (or team) capable of delivering a full range of services from initial condition assessment through construction closeout, and of navigating the regulatory approvals required for shoreline work on the Detroit River and its connected canals.

The City may make one or more awards under this RFP, at the City's discretion, for services to be performed on an as-needed, per-property basis over the contract term described in Section 8. The City currently estimates that 15 to 20 residential parcels will be served under this RFP, possibly more depending on pricing and available funding. This estimate is provided for planning purposes only and is not a guarantee of any minimum volume of work.

1.1 Objectives

1. Obtain accurate, engineer-grade assessments of existing seawall condition.

1. Obtain design and construction services for new seawalls, seawall repairs, and/or full seawall replacements that meet applicable codes and are appropriately sized for local soil, water level, and ice conditions.

1. Ensure all work is properly permitted through the Michigan Department of Environment, Great Lakes, and Energy (EGLE), and the U.S. Army Corps of Engineers (USACE) prior to construction.

1. Establish consistent scopes, deliverables, and pricing structures that allow the City to compare proposals and manage multiple residential properties under one contract vehicle.

1.2 Minimum Qualifications

Proposals will only be accepted from those firms demonstrating a minimum of five (5) years of experience providing the services requested in this RFP for projects of similar scope and size.

The Proposer may be a single firm offering all required services in-house, or a prime contractor teaming with one or more licensed subconsultants or subcontractors — including a Michigan-licensed Professional Engineer, as required under Section 3.2 — to meet the qualifications and licensing requirements of this RFP. The Proposer (prime) remains fully responsible for the performance, coordination, and quality of all work performed by its subconsultants and subcontractors, including design work sealed by a subconsultant Professional Engineer.

2. Site and Property Background The properties subject to this RFP are located along residential canals that connect to the Detroit River within the City of Detroit, Michigan. The project will repair, replace, and/or install seawalls for privately owned residential parcels along canals within the Jefferson-Chalmers neighborhood, including the Fox Creek, Phillip Street, and Lakewood Canals. Parcel addresses will be located on one or more of the following streets: Ashland, Klenk, Scripps, Harbor Island, Alter, Lakewood, and Manistique. The project’s intent is to assist with flood mitigation by providing seawalls, especially for low-income owner-occupants. Prospective proposers should independently verify site conditions during the pre-proposal site walk described in Section 5.2.

The subject properties lie within a FEMA-designated flood hazard area. As a result, and consistent with the City's flood mitigation objectives for the neighborhood, all new seawalls, seawall repairs/extensions, and full replacements performed under this RFP shall be designed to a minimum top-of-wall elevation of 580.0 feet NAVD88, unless a lower elevation is approved by the City under Section 3.2(5). The seawalls constructed under this RFP are intended to reduce flood risk at individual properties. They are not designed, certified, or accredited as a levee or flood protection system, and they are not expected to change any property’s FEMA flood zone designation or flood insurance requirements. Flooding may still occur from other sources, including through adjacent properties, storm sewer backup, groundwater, or floods exceeding the design flood elevation.

The condition of selected parcels will vary — from no seawall, to an existing seawall in need of replacement, to an existing seawall in need of repair, to an existing seawall in good condition that is low and in need of greater height.

Community engagement will take place before the contract is awarded and will not be the responsibility of the contractor. Construction is expected to be completed in 2027.

2.1 General Conditions to Be Addressed

1. Existing structure types may include steel sheet pile, timber crib, concrete, vinyl sheet pile, and rip-rap/armor stone seawalls of varying age and condition.

1. Water level exposure consistent with published NOAA/USACE Detroit River and Lake St. Clair gauge data, including seasonal high-water events.

1. Ice action, prop wash/wake erosion from canal boat traffic, and groundwater/backfill drainage conditions typical of Detroit-area canal lots.

1. Adjacent private docks, seawalls, retaining walls, utilities, and landscaping that may constrain construction access and staging.

3. Scope of Work The Contractor's scope of work is organized into four service categories. The City will issue specific task orders (see Section 3.6) identifying which services apply to each property. The Contractor is expected to coordinate the design and construction drawings with the City to help ensure that the selected infrastructure is durable and meets applicable requirements.

3.1 Category A — Condition Assessment

1. Perform a visual and physical condition assessment of the existing seawall and adjacent shoreline for each identified property, above and below the waterline (diver or remote inspection as needed).

1. Evaluate wall material, connection integrity, cap condition, tieback/anchor system (where present), toe scour, backfill loss/voids, settlement, and vertical/horizontal deflection.

1. Assess drainage conditions, including weep holes, backfill gradation (where determinable), and surface/subsurface water sources contributing to erosion.

1. Assign a condition rating (e.g., Good / Fair / Poor / Failed) and an estimated remaining service life for each structure.

1. Identify and photograph specific deficiencies, referencing them to a sketch or marked-up site plan.

1. Recommend a course of action for each property: no action, repair, install, or full replacement, with an order-of-magnitude cost range for budgeting purposes.

3.2 Category B — Engineering Design

1. Prepare design drawings and specifications for new seawall construction, repair, or replacement, sealed by a Professional Engineer licensed in the State of Michigan.

1. Perform or subcontract geotechnical investigation as needed to support wall design (soil borings/probes, soil classification, groundwater observations). The cost of all geotechnical investigation required for design is included in the Category B fixed fee.

1. Perform or subcontract a topographic survey of each property, referenced to NAVD88, sufficient to establish existing grades, the elevations of the existing wall and adjacent walls, and the location of the property lines along the wall alignment and returns, so that all work, including returns, is located on the subject property. Where property line locations cannot be reasonably established from available records and field evidence, the Contractor shall notify the City before finalizing the design. The cost of the survey is included in the Category B fixed fee.

1. Size and specify wall materials, embedment depth, tieback/anchoring systems, cap design, and toe protection appropriate to Detroit River canal conditions, referencing applicable design standards (e.g., current EGLE and USACE Detroit District requirements for the permits identified in Section 9, and City of Detroit building and zoning requirements).

1. Design all new seawalls, seawall repairs/extensions, and full replacements to achieve a minimum top-of-wall elevation of 580.0 feet NAVD88, consistent with the property's location within the FEMA-designated flood hazard area. Where an existing wall segment is being repaired, the repair design shall raise the wall to this required elevation where the existing top-of-wall elevation does not already meet it. The City may, at its sole discretion and with the property owner's written request and consent during Category B design, approve a top-of-wall elevation lower than 580.0 feet NAVD88 for a specific property. Where a reduced elevation is approved, the Engineer of Record shall design the wall for the approved elevation and shall detail the wall ends and returns to accommodate a tie-in by adjacent walls. The approved elevation shall be documented in the approved scope of work (Section 3.7), together with the property owner's signed request and acknowledgment. Category D work at the reduced elevation shall be paid at the unit prices quoted under Section 5.1. For a wall approved at a reduced elevation, the Engineer of Record shall design for flood water on the canal side at the lesser of the design flood elevation (item 7) or the approved top-of-wall elevation, and for overtopping, including protection of the landward side against scour and drainage of water trapped behind the wall. The approved scope of work shall state the flood water elevation the wall is designed to hold back and the resulting freeboard, if any, and the property owner’s signed acknowledgment shall confirm that the wall provides less flood protection than the program standard.

1. Size the wall section (material, grade, and thickness) to safely retain soil and resist the flood loads described in item 7, accounting for long-term section loss due to corrosion and the specific soil and loading conditions at each property. The City has reviewed a comparable basis of design prepared for a nearby city-owned flood mitigation project in the same neighborhood, which specified a hot-rolled steel sheet pile section (ASTM A572 Grade 60) with a minimum section modulus of 17.5 cubic inches per foot under a 150 psf surcharge load; proposers may reference this as a comparable data point but are not required to match it, since loading conditions on individual residential properties may differ.

1. Design each wall, including returns and tie-ins, to function as a floodwall as well as a soil-retaining wall. The design flood elevation is 578.0 feet NAVD88; the required top-of-wall elevation of 580.0 feet NAVD88 provides two (2) feet of freeboard above it. At a minimum, the Engineer of Record shall design for: (a) flood water on the canal side at the design flood elevation with no water on the landward side; (b) rapid drawdown following high water, with saturated backfill; and (c) ice and boat-wake loads. The design shall address seepage and underseepage (including embedment depth and interlock sealing where needed), toe scour, and overtopping. The Final Design Package shall document the design flood elevation, load cases, and factors of safety, with reference to applicable guidance such as USACE EM 1110-2-2502 (Retaining and Flood Walls) and EM 1110-2-2504 (Design of Sheet Pile Walls).

1. Design a return at each end of the new or raised wall wherever the adjacent wall or grade is lower than the required top-of-wall elevation. The Engineer of Record shall determine (a) the minimum return length required at each end for wall stability, soil retention, and protection of the adjacent property, which is required and may not be waived by the property owner; and (b) any recommended additional return length to reduce flanking of floodwater around the ends of the wall. The property owner may accept, shorten, or decline any additional length beyond the minimum. The property owner’s election, and the property owner’s written acknowledgment that shortened or omitted additional returns provide less flood protection, shall be documented in the approved scope of work (Section 3.7). Returns may step down in height as they extend inland, as determined by the Engineer of Record. Each end of the wall, including returns, shall be detailed to accommodate a future tie-in by an adjacent property’s wall at 580.0 feet NAVD88. Returns shall be measured and paid per linear foot at the Category D unit prices quoted under Section 5.1. Returns shall be paid at the New Installation unit price for the steel sheet pile grade specified by the Engineer of Record, regardless of the scope of work (repair or full replacement) for the main wall.

1. Prepare construction cost estimates at the schematic design and final design stages.

1. Prepare all drawings, applications, and supporting technical documentation needed for permit submittal (see Category C).

3.3 Category C — Permitting Support

1. Identify all permits and approvals required for each scope of work, including, as applicable, the federal, state, and local permits and approvals identified in Section 9. EGLE and USACE authorizations are generally requested through a single EGLE/USACE Joint Permit Application.

1. Prepare and submit complete permit applications, including all required drawings, narratives, and fee schedules.

1. The City will obtain from each property owner, when the property owner signs the program’s Terms of Agreement, a signed authorization allowing the Contractor to apply for the required permits as the property owner’s authorized agent. If an agency requires the property owner’s signature on the permit application itself, the Contractor shall obtain that signature, coordinating with the City as needed.

1. Respond to agency requests for additional information and attend agency meetings or site visits as required to secure approval.

1. Track and report permit status to the City on a schedule specified in the task order.

3.4 Category D — Construction: Installation, Repair/Raise, and Replacement

1. Mobilize equipment (land- and water-based as required) to construct new seawalls, repair/raise existing seawalls, or fully remove and replace failed seawalls per the scope of work approved under Section 3.7 and permit conditions.

1. Provide all labor, materials, equipment, and marine/land access required to complete the work, including coordination of barge, crane, or pile-driving operations within the canal.

1. Install or restore backfill and drainage systems behind the wall. Finish grade and level all disturbed lawn areas to a smooth, uniform surface that matches adjacent grades and slopes to drain, then seed and cover with hay or straw mulch. Where the finished grade behind the wall is below the top-of-wall elevation, the Engineer of Record shall design, and the Contractor shall install, surface drainage outlets through the wall at the low points of the finished grade, each fitted with backflow prevention (such as a flap gate or check valve) so that the outlets do not admit canal water during high-water conditions. The property owner is responsible for removing, before mobilization, any dock, shed, fence, or other structure, any boats and personal property, and any trees, shrubs, or plants they intend to keep or replant; the Contractor is not responsible for removing, storing, or reinstalling these items. If any such item has not been removed by the date stated in the homeowner notice (Section 3.5), the Contractor shall not begin work at that property until it is removed. Where the property owner agrees that a dock or other structure may be demolished rather than removed, and that demolition is identified in the approved scope of work (Section 3.7), the Contractor shall demolish the structure and legally dispose of all resulting debris. Dock demolition shall be paid at the unit price per square foot quoted under Section 5.1; demolition of any other structure shall be paid at the hourly rates quoted under Section 5.1.

1. Backfill Material. All backfill material imported to a property, including topsoil, shall meet the requirements of this item.

24. Fill Material Sampling and Source Approval. Prior to importing any fill material to a City-managed construction site, the selected construction contractor shall be responsible for contracting directly with a 3rd party qualified environmental consultant to collect and secure representative soil samples from the fill material, at the proposed source location, for laboratory chemical analyses of a specific list of constituents of concern (COCs). Upon collection, the samples must be packed, transported, and submitted, under strict chain-of-custody protocol, to a qualified/licensed analytical laboratory for chemical analyses of the COCs listed below. The fill material samples must be analyzed for the following COCs, using U.S. EPA-approved analytical methodologies:

The analytical methods listed above are provided for proposal purposes. The City reserves the right to update, correct, or substitute analytical methods (including current revisions of the listed USEPA methods), and to specify the required sampling frequency and number of samples per fill source, prior to or during contract performance. Any such requirements will be provided to the Contractor in writing before the Contractor’s first fill material sampling event. Proposers shall assume, for pricing purposes, sampling and analysis of the constituents listed above at a frequency consistent with standard industry practice for residential fill source approval.

The final laboratory analytical data reports must be submitted to the City for review and fill material source approval. In addition, the construction contractor’s environmental consultant must prepare and submit, for City review/approval, a summary letter report that includes all analytical results, data tabulations, fill material sampling methods and findings. The findings must include a written opinion of any human health risks, including an evaluation of any potential pathways for human exposure, and the findings must include the following statement:

“[COMPANY NAME] has evaluated the fill material located at [SOURCE NAME & ADDRESS] on behalf of [CONTRACTOR NAME & ADDRESS] for use at [PROJECT SITE LOCATION & ADDRESS], a City-managed construction site. Based upon the analytical results, we have determined that the fill material to be imported to the above-referenced project site [is / is not] contaminated above the state’s Part 201 Residential Generic Cleanup Criteria. Therefore, in our professional opinion, the fill material [is / is not] suitable for use as fill. [COMPANY NAME] warrants that no information or documentation has been deleted, omitted, or changed which would otherwise cause the City of Detroit and its agencies and authorities to reach a different conclusion. Furthermore, [COMPANY NAME] understands that the City of Detroit and its agencies and authorities rely upon the overall completeness, accuracy, and conclusions in the summary letter report and hereby provides reliance on the contents presented herein.”

The summary letter report shall also document a review of publicly available environmental records and databases for the source location and state whether the source is (1) a site of contamination under Part 201 of PA 451; (2) the location of any underground storage tank, or leaking underground storage tank, regulated under Part 211 or Part 213 of PA 451; (3) a federal Superfund site; (4) subject to any land or resource use restriction on file with EGLE; (5) a PFAS-contaminated site or Area of Interest; or (6) subject to any environmental enforcement action. The City will not approve a source with any of these characteristics unless it determines otherwise in writing.

24. Part 201 Residential Cleanup Criteria. For each COC listed in item 4(a), all imported backfill materials, including topsoil, must fall within the state residential generic cleanup criteria established under Part 201 of the Natural Resources and Environmental Protection Act, 1994 PA 451, as amended, in effect on the date of delivery. However, at its sole discretion, the City may allow materials which contain concentrations of certain metals in exceedance of the state residential cleanup criteria so long as those concentrations fall within the glacial lobe background levels and the Contractor’s environmental consultant has provided a reasoned explanation for such concentrations in the summary letter report. Concentrations accepted by the City under this exception shall not be considered contamination for purposes of the statement required in item 4(a). The cost of the environmental consultant’s services, sampling, and laboratory analyses shall be borne by the Contractor.

24. Backfill Materials. Backfill materials shall be specified by the Engineer of Record, including material type, gradation, compaction, and drainage provisions, based on the site-specific wall design and the geotechnical investigation performed under Section 3.2. All imported backfill shall also meet the requirements of items 4(a) and 4(b). If questions arise as to whether delivered material conforms to the Engineer of Record’s specification, the Contractor shall provide documentation acceptable to the City evidencing conformance, at the Contractor’s expense. Topsoil must consist of sand or loam (no clay), must be completely free of pulverized or crushed building materials, construction debris, brush, and any other undesirable material, and must have an organic content at 5% or greater. Where the Engineer of Record specifies other materials at or adjacent to the wall, such as drainage stone or a splash pad, the Engineer of Record’s specification shall govern.

24. On-Site Soil and Prohibited Materials. Soil excavated at the property during the work may be reused as backfill only with the approval of the Engineer of Record and the City. If the Contractor encounters soil exhibiting evidence of contamination (such as staining, odor, sheen, or buried debris), the Contractor shall stop work in the affected area and notify the City before proceeding. Excess excavated soil shall be managed and disposed of in accordance with applicable law. Dredged material, canal spoils, and sediment shall not be used as backfill.

24. Submittal of Backfill Information and Documentation. The Contractor must provide all required information and documentation to the City in a form and manner as directed. The City reserves the right to withhold approval of or deny any proposed backfill source with incomplete information or documentation, and the City shall have the final determination as to the completeness of the information and documentation.

24. Delivery Records. The Contractor shall maintain a delivery ticket for each load of backfill showing the source, delivery date, quantity, and the property receiving the material, and shall submit copies of all delivery tickets for each property with that property’s closeout documentation.

24. Verification and Nonconforming Material. The City may sample and test backfill at any time, whether stockpiled, delivered, or in place. Backfill that does not meet the requirements of this item shall be considered nonconforming. The Contractor shall remove and replace nonconforming material and restore all affected areas at the Contractor’s expense, and shall reimburse the City for the cost of any testing that identifies nonconforming material.

1. Implement erosion and sedimentation controls (e.g., turbidity curtains) during in-water work in compliance with permit conditions.

1. Coordinate scheduling with individual homeowners for access, staging, and temporary disruption, and provide advance written notice per the requirements in Section 3.5.

1. Perform post-construction cleanup, restore property to a safe and orderly condition, and remove all construction debris and equipment.

3.5 Homeowner Coordination and Communication

1. Provide each affected homeowner with a written notice at least 10 business days prior to mobilization describing the work, expected duration, and any required access. The notice shall also list the items the property owner must remove under Section 3.4 (including docks, sheds, fences, or other structures, boats, personal property, and any trees, shrubs, or plants they intend to keep or replant), state the date by which removal must be complete, and explain that work will not begin until those items are removed. Any structure the property owner has agreed may be demolished under the approved scope of work (Section 3.7) shall be identified in the notice and need not be removed by the property owner.

1. Designate a single point of contact available to homeowners and the City throughout each project for scheduling and concerns.

1. Maintain a complaint/issue log and provide it to the City upon request.

3.6 Task Order Structure

Work will be authorized on a per-property or per-group-of-properties basis through individual task orders issued under the master contract. Each task order will specify the applicable service category or categories (A–D), the property or properties involved, the schedule, and the not-to-exceed price or fee basis, consistent with the Contractor's proposal pricing (Section 5).

3.7 Scope of Work Approval

Upon completion of Final Design (Category B) for a property, the Contractor shall prepare a written scope of work summarizing the proposed work, wall type and material, top-of-wall elevation, return locations and lengths (including the property owner’s election regarding any additional return length under Section 3.2), anticipated impacts to existing yard and shoreline features (see Section 3.4), and estimated schedule, in a format suitable for review by the property owner and the City.

The Contractor must receive written sign-off on the scope of work from both (a) the property owner, and (b) the City, before mobilizing for construction (Category D) at that property. The Contractor shall not commence construction at any property until both approvals have been obtained and documented.

If the property owner declines to approve the scope of work or requests changes, the Contractor shall coordinate with the City to resolve the disagreement or, at the City’s direction, revise the design and resubmit for approval. The City reserves the right to remove a property from the scope of work under this RFP if agreement cannot be reached within a reasonable time, as determined by the City.

If a property is removed from the scope of work under this Section, or a required permit for a property is denied, through no fault of the Contractor, the Contractor shall be paid for the Category B (Design) and Category C (Permitting Support) services completed for that property through the date of removal or denial. Payment shall be based on the fixed fees quoted under Section 5.1, prorated by the City according to the work actually completed, and may be invoiced upon the City’s written notice of removal or the agency’s denial.

4. Deliverables The Contractor shall provide the deliverables listed below for each applicable service category. All written deliverables shall be provided in both editable electronic format (e.g., Word, native CAD) and PDF, unless otherwise agreed.

4.1 Assessment Deliverables (Category A)

4.2 Design Deliverables (Category B)

4.3 Permitting Deliverables (Category C)

4.4 Construction Deliverables (Category D)

5. Proposal Submission Requirements Proposals shall be organized into the following sections. Proposals that do not follow this format may be deemed non-responsive. Proposals must respond completely to the scope of work described in Section 3, and pricing must be submitted using the companion Cost Proposal Workbook provided by the City.

1. Cover Letter — signed by an authorized representative, identifying the firm(s) comprising the proposing team.

1. Firm Qualifications and Experience — description of relevant seawall/bulkhead and marine construction experience in the Detroit River, Lake St. Clair, or comparable Great Lakes waterway environments, including at least three comparable residential seawall projects completed in the last seven years, with client references.

1. Key Personnel — resumes of the licensed Professional Engineer(s), project manager, and construction superintendent who will be assigned, including Michigan PE license numbers.

1. Licensing, Insurance, and Bonding — evidence of Michigan contractor licensing, current insurance coverage, bonding capacity, and the safety training and certification documentation required under Section 9. Bonding capacity shall be demonstrated by a letter, dated within sixty (60) days of the proposal due date, from a surety licensed to do business in Michigan and listed on the U.S. Department of the Treasury’s Circular 570, stating (a) the proposer’s single-project and aggregate bonding limits, and (b) that the surety is prepared to issue performance and payment bonds for Task Orders under any contract resulting from this RFP. Proposers shall also state their current bonded backlog (the total value of uncompleted work currently covered by bonds).

1. Approach and Methodology — narrative describing the firm's approach to assessment, design, permitting, and construction sequencing for residential canal seawalls, including how the firm will manage multiple concurrent homeowner sites. The narrative shall state the maximum number of properties the proposer can have under active construction at one time and the total number of properties it can complete during the 2027 construction season.

1. Schedule — proposed timeline for a representative task order in each service category.

1. Pricing Proposal — completed fee schedule per Section 5.1 below, submitted in a separate sealed envelope or file.

1. Walked Property Cost Worksheet — completed per Section 5.2 below, using the format in the companion Cost Proposal Workbook, for each of the City-designated Walked Properties.

1. Subcontractors — identification of any geotechnical, surveying, diving, environmental consultant, or specialty subcontractors to be used.

1. Sample Deliverable — one sample condition assessment report or design drawing set from a prior, comparable project (may be redacted for client confidentiality).

5.1 Pricing Structure

Proposers shall submit pricing using the structure below to allow consistent comparison across proposals. The City reserves the right to negotiate final pricing with the selected proposer(s).

Steel Sheet Pile Grade Definitions For purposes of Category D pricing, proposers shall quote unit prices for both of the following steel sheet pile grades. The City is evaluating the cost difference between the two grades as part of its capital planning — the lower-cost grade minimizes upfront cost, while the higher-cost grade is intended to extend service life and reduce the likelihood of premature replacement for homeowners, consistent with the 580.0 feet NAVD88 design elevation and flood-mitigation objectives described in Section 2.

The specific section, thickness, and grade required at each property shall be determined by the Engineer of Record during Category B design, based on site-specific geotechnical and loading conditions and the required 580.0 feet NAVD88 top-of-wall elevation. Proposer unit prices for both grades will be used by the City to evaluate cost-of-ownership tradeoffs on a per-property basis, not to pre-select a grade in advance of design. In the Notes column of the Unit Price Schedule, proposers shall state, for each grade priced, the section designation, thickness or gauge, steel grade, and section modulus (in³/ft), and, for the Light-Duty grade, the maximum exposed wall height for which the section is typically suitable in residential canal conditions. The City may use this information to determine whether the Light-Duty grade is a practical option for a given property.

Scope Definitions For purposes of Category D pricing, the three scopes of work are defined as follows:

New Installation — construction of a new seawall where none exists, and all returns (Section 3.2), regardless of the scope of work for the main wall.

Repair (Raise) — raising an existing, structurally sound seawall to the required top-of-wall elevation, including removal of the existing cap, extension or splicing of the existing sheet pile, a new cap, and any reinforcement of the existing wall needed to carry the added height, as designed by the Engineer of Record. Where the Engineer of Record determines that the existing wall cannot be raised, a new wall installed in front of the existing wall (with the existing wall left in place) shall be paid at the New Installation unit price, and a new wall that requires removal of the existing wall shall be paid at the Full Replacement unit price.

Full Replacement — removal and legal disposal of an existing seawall, to the extent required by the design, and construction of a new seawall in its place.

Repairs other than raising (for example, localized section replacement, cap repair, or toe scour protection) are not priced on the Unit Price Schedule. Where such a repair is warranted, it shall be priced on the applicable Task Order at the hourly rates quoted under Section 5.1, plus materials and rented equipment at the Contractor's documented cost plus ten percent (10%).

Tieback/Anchor Assembly Pricing Tieback and anchor requirements — including anchor spacing, deadman size and embedment depth, and tie rod length — vary by property based on retained soil height, soil conditions, and yard setback, and are not standardized in the same way as the sheet pile section itself. For this reason, proposers shall quote tieback/anchor assemblies as a separate unit price per assembly, rather than folding this cost into the per-linear-foot wall price. The Engineer of Record will determine the required quantity, spacing, and configuration of tieback/anchor assemblies for each property during Category B design, consistent with the required 580.0 feet NAVD88 top-of-wall elevation and site-specific loading conditions. Actual Category D payment for tieback/anchor assemblies on any resulting task order will be based on the final design quantity and the proposer's quoted unit price.

Friction Pile Anchor Pricing In some conditions — including limited yard depth, restricted access, or soil conditions unsuitable for a conventional deadman anchor — the Engineer of Record may specify friction pile anchors as an alternate to a tie rod and deadman anchor assembly. Unlike a deadman assembly, which is priced as a single fixed unit, a friction pile anchor’s capacity and cost scale with penetration depth. Proposers shall therefore quote a unit price per linear foot driven or installed, in addition to — not in place of — the tieback/anchor assembly pricing above. The Engineer of Record will determine, on a per-property basis and during Category B design, whether a conventional tieback/anchor assembly or a friction pile anchor system is appropriate; actual payment on any resulting task order will be based on final design depth at the quoted unit price.

Mobilization Access Tier Definitions Mobilization requirements vary by property depending on equipment access, staging area, and overhead or waterway clearance restrictions. For purposes of Category D pricing, proposers shall quote a separate fixed mobilization fee for each of the three access tiers defined below. The City will apply the tier applicable to each property, as determined during the Category A assessment or Category B design, when authorizing a task order.

The applicable tier may differ from property to property within the same task order. Proposers' quoted mobilization fees will be applied by tier, consistent with observed or anticipated conditions at each property, and are separate from the per-linear-foot unit prices quoted for wall construction. The mobilization fee is paid once per property and includes all mobilization, demobilization, and any remobilization required to complete the work at that property, whether or not equipment or crews are shared with other properties in the same task order.

5.2 Mandatory Site Walk and Walked Property Cost Worksheet

To ground pricing in actual field conditions and provide a cross-check against the unit price and fixed-fee schedule in Section 5.1, the City will conduct a mandatory site walk of a representative sample of properties (the “Walked Properties”) as part of the proposal process.

1. The City will select up to six (6) Walked Properties spanning a range of wall types, conditions, and anticipated scopes of work (new installation, repair, full replacement), and will identify these properties in advance of the site walk.

1. The site walk is mandatory. All proposers intending to submit a proposal must attend on the date specified in Section 6, escorted by the City's representative. Proposers who do not attend the mandatory site walk may be deemed non-responsive.

1. All proposers will view the same Walked Properties, under the same conditions, during the same scheduled visit(s). Proposers shall not contact the owners of the Walked Properties or any other program property, or enter any program property, regarding this RFP except during the City-escorted site walk.

1. For each Walked Property, proposers shall submit a completed Walked Property Cost Worksheet stating a total project cost for each of the two steel sheet pile grades defined in Section 5.1 (Light-Duty and Heavy-Duty), broken out by Category A, B, C, and D (with Category D priced separately for each grade) plus tieback/anchor assemblies or friction pile anchors, mobilization, and dock demolition (if applicable), consistent with the unit prices and fixed fees quoted in Section 5.1.

1. Walked Property totals are budgetary estimates based on the proposer's visual assessment during the site walk. Category B (Design) and Category C (Permitting) figures remain subject to completion of engineering design and permit approval; actual Category D construction payment on any resulting Task Order will be based on final design quantities and the unit prices quoted in Section 5.1, not the Walked Property estimate.

1. The City will use the Walked Property totals during evaluation (Section 7) to assess the internal consistency of each proposer's pricing — i.e., whether the walked-property total reasonably reconciles with that proposer's own quoted unit prices and fixed fees applied to the observed conditions.

Each Walked Property Cost Worksheet shall include the following line items:

A fillable Walked Property Cost Worksheet is provided as a tab in the companion Cost Proposal Workbook accompanying this RFP.

5.3 Canal Property Owner Discount

Owners of other properties fronting the Fox Creek, Phillip Street, or Lakewood Canals in the Jefferson-Chalmers neighborhood that are not included in the City’s property portfolio (“Canal Property Owners”) may wish to independently engage the selected Contractor to perform comparable seawall assessment, design, or construction work at their own expense, taking advantage of the Contractor’s mobilization already in place for the City’s work. Any such work is a private arrangement directly between the Contractor and the Canal Property Owner and is outside the scope of, and not administered under, this RFP or any resulting City contract or task order.

1. Proposers may, at their option, state as part of the Pricing Proposal (Section 5.1) a discount percentage the Contractor will offer off its standard retail pricing for Canal Property Owners under this arrangement, in recognition of the Contractor’s reduced mobilization cost. The discount applies to the Canal Property Owner’s entire private-pay project (assessment, design, permitting, and construction, as applicable) and is separate from, and not tied to, the Category A–D pricing quoted elsewhere in Section 5.1 for the City's portfolio properties, since the Contractor's retail pricing may be higher or lower than its contract pricing under this RFP. Providing a discount percentage is not required, and a proposer's decision to offer, decline, or set the level of this discount will not be scored and will have no effect on the City's evaluation of the proposer's pricing under Section 7.

1. Any agreement entered into between the Contractor and a Canal Property Owner for private-pay work is strictly a private contract between those two parties. The City of Detroit is not a party to, sponsor of, or guarantor for any such private agreements. The City of Detroit assumes no responsibility, liability, or financial obligation for any work performed, damages incurred, disputes arising, or payments due as a result of private contracts between the Contractor and third-party property owners.

1. The Contractor remains solely responsible for obtaining all permits and approvals applicable to any work for a Canal Property Owner, independent of any permits obtained for the City’s portfolio properties.

1. Work for Canal Property Owners shall not delay, or take priority…