10-Attachment C - Geotechnical Scope of Services.pdf

Attachment C Geotechnical Scope of Services

Hillsborough County Geotechnical Scope of Services

1.0 Purpose

Hillsborough County requires the Consultant to provide professional Geotechnical Engineering and inspection services as part of Construction Engineering and Inspection (CEI) activities for County capital improvement projects. These services include oversight, inspection, verification, documentation, and engineering evaluation related to subsurface construction.

2.0 General Requirements

• The prime Consultant may engage a geotechnical subconsultant; however, the prime remains fully responsible to Hillsborough County for performance, accuracy, and timeliness of all geotechnical services.

• All material testing must be carried out in full accordance with Appendix E – Testing Schedule, which is incorporated by reference. The requirements in Appendix E apply to all administrative tasks, materials testing, documentation, and reporting activities conducted under this scope.

• All services shall comply with applicable Hillsborough County standards and requirements originating from FDOT Specifications. Comply with all State, County, and local ordinances;

obtain necessary permits prior to construction.

• Geotechnical personnel shall meet all required CEI certifications, including Earthwork Levels I & II, and related inspection qualifications.

o CTQP Concrete Field Inspector Level I o CTQP Asphalt Roadway Level I o CTQP Earthwork Construction Inspection Level I & II o CTQP Final Estimates Level I o FDOT Intermediate MOT o Nuclear Radiation Safety o Florida Stormwater, Erosion, and Sedimentation Control Training and Certification

Program

3.0 Geotechnical Engineering Services

The Consultant shall perform the following geotechnical tasks on behalf of Hillsborough County:

3.1 Site Familiarization

• Review existing site conditions, soils reports, geotechnical data, and contract documents prior to construction.

• Confirm understanding of subsurface conditions impacting

3.2 Verification & Inspection

• Observe and record the progress and quality of all construction.

• Identify any discrepancies or deficiencies and direct the Contractor to correct them.

• Embankment: Proctor per soil type; density tests (98% in R.O.W., 95% outside).

• Stabilized Subgrade: LBR tests (minimum standards); density per FM 5-515.

• Base Materials: LBR requirements, daily compressive tests, density criteria.

• Concrete: Temperature, slump, air content, compressive strength cycle.

• Superpave Asphalt: Mix design, specific gravity, extraction/gradation, thickness, density limits.

• Verify proctor for each soil type (AASHTO T180 or FM 5-515).

• Perform density tests every 500 feet horizontally and each 1-foot lift.

• Confirm LBR minimums for subgrade and base materials.

• Ensure concrete cylinders sampled per 100 cubic yards.

• Record asphalt core density and thickness per production day.

• Document temperature, slump, air content for each concrete sample set.

3.3 Final Test Report Packages

One bound (in book format) and one electronic (pdf) final project test report package must be submitted in the following format, with required documentation as appropriate. Plans showing the test locations, along with the test numbers, must be identified with each section. The plans can be a pdf of the construction plans where the test report information is added, or it can be a color scanned pdf copy.

• COVER – Include project name, Hillsborough County project ID, location and contact information.

• SIGNED AND SEALED CERTIFICATE – Must be signed and sealed by Geotechnical Engineer and include a verification statement that testing requirements of the Hillsborough County technical manuals have been achieved or exceeded. If testing requirements were not, a description of deficiencies must be noted.

3.4 Meetings & Coordination

• Attend the Preconstruction Conference and any special geotechnical meetings required by Hillsborough County.

• Schedule and conduct geotechnical coordination meetings with the Contractor, CEI staff, Specialty Contractors, and the Engineer of Record (EOR).

• Prepare and distribute meeting minutes.

3.5 Specialty Work Oversight

• Oversee and verify specialty geotechnical construction work, ensuring compliance with contract intent.

• Document performance and progress of geotechnical specialty operations.

4.0 Construction Inspection Services

The Consultant shall provide complete drilled shaft oversight including:

4.1 Plan Review

• Process and review Drilled Shaft Installation Plan(s).

• Check for compliance with contract documents and County geotechnical requirements.

4.2 Pre-Installation Preparation

• Schedule and conduct pre-installation meetings with required attendees including Contractor superintendent, and EOR.

• Prepare and distribute official meeting minutes.

4.3 Field Inspection

• Inspect test, load test shafts, and production shafts.

• Ensure all work is constructed per plans, specifications, and special provisions.

• Document deviations, issues, or changes and report findings to the EOR and County Project

Administrator.

• Verify locations and complete all County-required documentation including inspection logs.

4.4 Engineering Recommendations

• Analyze load test data, pilot hole evaluations, and soils/rock data.

• Recommend production shaft tip elevations and minimum rock socket lengths.

• Prepare geotechnical recommendation reports for Hillsborough County and the EOR.

5.0 Reporting & Documentation

• Maintain complete geotechnical logs, inspection forms, and meeting minutes.

• Provide daily documentation of work-related geotechnical activities.

• Notify the County and EOR of any geotechnical issues requiring immediate attention.

• Prepare a final geotechnical summary report for the project closeout.

6.0 Environmental Compliance – SWPPP / NPDES CGP

Utilize FDOT NPDES CGP SWPPP Template (Form 251-B, v1.01) to meet FDEP requirements for stormwater discharge from construction activities. Include erosion control plans, inspection schedules, and documentation logs per template.

7.0 Personnel Qualifications

Geotechnical personnel shall meet Hillsborough County’s CEI qualification requirements, including:

• Licensed Professional Engineer (Florida PE or eligible within six months).

• Minimum four (4) years of geotechnical engineering experience in responsible charge.

• CTQP Earthwork Construction Inspection Levels I and II.

• Nuclear Radiation Safety (for density testing).

• Proficiency in Trimble Business Center – Heavy Construction Edition (HCE) or County-approved surface comparison software.

8.0 Coordination with Hillsborough County Staff

• Consult with the County Project Administrator and CEI team regarding geotechnical issues.

• Ensure geotechnical operations align with the project schedule.

• Support County staff during project reviews, audits, and technical discussions.

9.0 Closeout

The Consultant shall:

• Provide final geotechnical documentation, including logs, engineering recommendation reports, and field verification records.

• Assist Hillsborough County with final geotechnical acceptance, audits, and construction closeout.