B08_SOL_-_Attachment_1__-_SOW_for_HAMP_Stormwater_Rehabilitation.pdf

Historic Preservation Training Center

STATEMENT OF WORK

Hampton National Historic Site (HAMP) Replace Deteriorating Stormwater Management Controls

1.0 GENERAL DESCRIPTION

Hampton National Historic Site (HAMP), located in northeastern Baltimore County, Maryland, preserves the historic core of a once 25,000-acre commercial, industrial, and agricultural estate.

The site currently encompasses approximately 62 acres and includes nationally significant cultural and natural resources such as the Ridgely family mansion, historic agricultural structures, and housing for enslaved and later free workers.

This project will rehabilitate existing stormwater management infrastructure within the visitor parking and visitor center areas to ensure continued compliance with environmental protection standards and long-term system functionality.

2.0 PURPOSE AND BACKGROUND

The purpose of this project is to rehabilitate five (5) stormwater management systems required by the Maryland Department of the Environment (MDE) as part of the Park’s ongoing maintenance obligations.

The stormwater controls were originally constructed in 2012 to meet Chesapeake Bay Watershed (CBW) environmental protection requirements. These systems include:

• Three (3) bioretention basin

• One (1) stormwater runoff retention (dry) pond

• 25 Wooden Check Dams

• Native absorbent plant species and percolation soil systems

Over time, system components—including wooden check dams, soil media, vegetation, and drainage conveyances—have deteriorated and no longer perform as designed. This project will restore system function by replacing degraded materials, correcting elevations, and improving long-term durability.

3.0 SCOPE OF WORK / TASKS

Note: Quantities listed are provided for informational purposes only. The Contractor is responsible for verifying all dimensions, quantities, and site conditions and shall bid accordingly.

It will be the contractor’s responsibility to repair any damage to roadways, curbing, parking lots, sidewalks and property not described in this scope of work or outside of the limit of disturbance at no cost to the government.

The contractor will not be allowed to close any roadways, sidewalks or parking lots during construction.

3.1 Demolition and Site Preparation

1. Demolish and remove twenty-five (25) existing wood-fabricated check dams and legally dispose of all debris offsite.

2. Install temporary erosion and sediment control measures in accordance with contract specifications, drawings, and applicable regulations.

3.2 Check Dam Replacement

3. Furnish and install twenty-five (25) new concrete check dams at the exact locations of the original dams.

o Concrete surface shall include a wood-grain texture and dyed pigment concrete finish on all exposed surfaces to match historic aesthetics. Texture and color to be determined by the COR.

o Installation shall strictly follow construction drawings and technical specifications.

3.3 Bioretention Area Rehabilitation

4. Remove existing vegetation, mulch, sand, and soil layers from Micro-Bioretention Areas #1, #2, and #3.

o Verify existing elevations and compare them to the 2012 construction drawings.

o Adjust grades as necessary to match original design elevations.

o Install new clean soil media, mulch, and plant materials per original specifications.

3.4 Dry Pond Rehabilitation

5. Inspect the dry pond to verify elevations against the 2012 construction drawings.

o Perform corrective grading per original drawings if elevations are found to be non-compliant.

o Restore the pond to original design conditions per specifications.

3.5 Drainage Infrastructure

6. Inspect, clean, and flush all identified subsurface drainpipes using pressurized water.

o Ensure all pipes and grates are free of debris and sediment.

o Repair or replace damaged pipes or appurtenances as necessary.

o Provide video camera evidence of each pipe section cleaned.

3.6 Site Restoration

7. Re-seed and stabilize all disturbed areas in accordance with specifications and construction drawings.

4.0 SAFETY REQUIREMENTS

All work shall comply with applicable OSHA, NPS, MUTCD, ANSI, federal, state, and local safety laws and regulations.

• A site-specific Safety Plan shall be submitted and approved prior to mobilization.

• All personnel shall wear required personal protective equipment (PPE).

• Equipment shall be operated only within manufacturer’s recommendations.

• Public safety shall be maintained at all times through barricades, fencing, signage, and traffic control measures.

• Emergency incidents shall be reported immediately per approved procedures.

• The Contractor shall designate an on-site qualified Safety Representative with contact information.

Emergency Contacts:

• Emergency: Call 911

• Non-Emergency / Park Headquarters: 410-823-1309

• Notify CO and COR within 24 hours of any incident.

5.0 GOVERNMENT-FURNISHED INFORMATION AND SERVICES

The Government will provide:

• Limited water and electrical access (upon request)

• Site maps and facility layout plans

• Photographs of existing conditions

All other materials, labor, tools, and equipment are the responsibility of the Contractor. Gas-powered generators are permitted during normal work hours with COR approval.

6.0 CONTRACTOR REQUIREMENTS

6.1 Supervision and Staffing

• A qualified on-site supervisor and alternate supervisor shall be designated.

• Supervisors must have:

o Minimum 5 years of stormwater/concrete construction experience o Minimum 2 years supervisory experience o Demonstrated construction safety knowledge

• Supervisors must be fluent in English and present onsite during all work.

6.2 Workforce and Identification

• Contractor shall provide sufficient manpower and equipment to meet schedule.

• All employees shall wear identifiable company uniforms with logos and employee names.

6.3 Quality Control, Submittals and Documentation

SUBMITTALS REQUIRED AFTER AWARD / PRIOR TO NTP

(Approval Required)

1. Project Schedule o Baseline schedule covering the full 90-day period of performance o Identify major activities and milestones o Weekly updated 3-week look ahead schedule

2. Site-Specific Safety Plan (SSSP) o Activity hazard analyses o Emergency procedures o On-site Safety Representative designation o OSHA compliance documentation

3. Quality Control Plan (QCP) o QC organization and responsibilities o Inspection and documentation procedures o Corrective action process

4. Erosion and Sediment Control Measures o Temporary controls and installation details o Maintenance and removal procedures

5. Supervisor Qualifications o Résumés for on-site supervisor and alternate o Documentation meeting experience requirements

6. Equipment List o Major equipment proposed for use o Confirmation of equipment cleaning prior to park entry

3. MATERIAL AND PRODUCT SUBMITTALS

(Submit and receive approval prior to fabrication or installation)

7. Concrete Check Dam Submittals o Concrete mix design o Dyed pigment color samples o Wood-grain texture finish sample or mock-up o Manufacturer product data

8. Bioretention Soil Media o Soil composition and gradation o Certification of compliance with original design specifications

9. Plant Materials o Plant list including species, size, and quantities o Certification of native species compliance

10. Mulch and Aggregate Materials o Product data and source information

4. CONSTRUCTION PHASE SUBMITTALS

(For Record unless otherwise noted)

11. Weekly Daily Work Logs

12. Elevation and Grading Verification

• Field verification against 2012 construction drawings

• Documentation of corrective grading

13. Drainpipe Cleaning Documentation

• Video camera inspection footage for each pipe segment

• Written summary of findings and repairs

14. Hazardous Materials Handling and Disposal Documentation

• Handling procedures

• Disposal manifests

5. CLOSEOUT SUBMITTALS

(Required prior to final payment)

15. As-Built Drawings

• Record drawings reflecting field conditions

• Verified elevations and locations of stormwater features

16. Warranty Documentation

• One-year warranty for all labor and materials

17. Punch List Completion Documentation

18. Final Invoice Package

• Pencil invoice for CO/COR review

• Supporting documentation

• IPP-compliant final submission

BIDDER NOTE

Contractors are responsible for reviewing the SOW, drawings, and specifications in their entirety.

Submittal approval does not relieve the Contractor of responsibility for compliance with contract requirements.

6.4 Hazardous Materials

• All hazardous materials shall be properly handled, captured, and disposed of.

• Disposal manifests shall be submitted prior to final invoice.

• Lead contamination in soil or water is prohibited.

7.0 WORK CONDITIONS AND SITE LIMITATIONS

• Weather conditions may require schedule adjustments.

• Park areas may be closed at any time for visitor safety or operations.

• Contractor is responsible for site security at all times.

• Protection of cultural and natural resources is mandatory.

• All equipment must be cleaned prior to entering the park to prevent invasive species.

• Wildlife harassment or harm is strictly prohibited.

8.0 PERIOD OF PERFORMANCE

• Work shall begin within 10 days of Notice to Proceed (NTP).

• Project duration: 90 calendar days from NTP.

• Schedule adjustments may be approved by the CO/COR.

9.0 HOURS OF OPERATION

Work shall be performed:

• Monday – Friday

• 7:00 AM – 5:00 PM ET

• Excluding federal holidays or government closures.

10.0 INVOICING AND PAYMENT

• Invoices shall be submitted through the Department of Treasury’s Invoice Processing Platform (IPP).

• Pencil copies must be submitted to CO and COR for review prior to IPP submission.

• Payment requests shall not exceed one per 30 days.

• Invoices lacking required documentation will be rejected.

• Total payments shall not exceed the fixed-price contract value.

11.0 CONTRACTOR CONDUCT AND LIABILITY

• Professional conduct is required at all times.

• Alcohol, drugs, gambling, solicitation, or disorderly conduct is prohibited.

• Contractor is fully responsible for damages to persons or property caused by operations.

• All damages must be reported within 2 hours and documented within 24 hours.

12.0 FUNDING CONTINGENCY

Award and continuation of this contract are contingent upon the availability of federal appropriations. The Government reserves the right to delay or modify the solicitation accordingly.