B08_Solicitation_Attach_1_SOW.docx

Scope of Work (SOW)

Padre Island National Seashore (PAIS) Waste Water Tank Replacement

Table of Contents

1.0 Project Description / Summary

2.0 Objectives

3.0 Background

4.0 Specific Work / Tasks

5.0 Optional Work / Tasks

6.0 Government Furnished Equipment / Materials / Other

7.0 Special Conditions / Requirements

8.0 Place of Performance

9.0 Performance Period / Schedule Requirements

Scope / Statement of Work

Task Order / Project Title:

Waste Water Tank Replacement

Park / Park Unit:

Padre Island National Seashore (PAIS)

Task Order#:

1.0 PROJECT DESCRIPTION / SUMMARY:

The primary work of this project includes, but is not limited to, the removal of the existing 1,000-gallon jointed concrete wastewater (sewage) tank at the Fee Collection building and the installation of a new 1,000-gallon capacity sealed polyethylene (poly) wastewater tank with supporting apparatus or approved equivalent. This includes site preparation, excavation, tank removal and disposal, new tank installation with ballast anchoring and corrosion-resistant straps, plumbing connections, backfilling, site restoration, and system testing. The project addresses deferred maintenance and health/safety concerns in a wetland/estuary environment, ensuring compliance with environmental protections and applicable codes.

2.0 OBJECTIVES:

This project is intended to replace the failing existing concrete wastewater tank to prevent groundwater infiltration, reduce operational and maintenance (O&M) costs, improve restroom facility capacity for Fee Collection staff and visitors, and eliminate potential wastewater discharges. While enhancing visitor enjoyment, access, and health/safety in alignment with Federal Lands Recreation Enhancement Act requirements. The new system will support increased staffing and visitation (approximately 600,000 annual visitors) by providing reliable wastewater management in a hypersaline, corrosive marine environment.

3.0 BACKGROUND:

The current septic tank is a jointed concrete constructed tank installed prior to 2020, which is failing due to groundwater infiltration through unsealed joints and is undersized for current operational needs. With the addition of two renovated Fee Collection stations and increased staffing, the tank requires frequent servicing, spiking O&M costs. Recent weather changes have elevated groundwater levels, exacerbating infiltration. A 2020 regional condition assessment identified system deficiencies, with requested solution to maintain operations. The park's environment includes relentless marine influences from the Gulf of Mexico and hypersaline Laguna Madre, causing rapid corrosion, sand abrasion, and pest issues, necessitating durable, corrosion-resistant materials.

4.0 SPECIFIC WORK / TASKS:

The Contractor shall perform all work in accordance with the following detailed specifications, using industry-standard practices and complying with referenced codes and standards. All materials shall be new, free from defects, and certified for wastewater use. The Contractor shall coordinate with the NPS COR for site access and inspections. The Contractor is responsible for all methods, sequencing, and safety used during construction unless specifically addressed otherwise in the contract documents. The Contractor shall comply with all local, state, and federal laws and regulations applicable to the construction covered by these plans, including but not limited to OSHA regulations.

Contractors shall satisfy themselves as to actual quantities and site conditions prior to providing proposals for the work. By submitting a bid proposal, each Contractor certifies that they have thoroughly inspected the project location, are familiar with local codes, and have read and fully understood the contract documents as they relate to the work involved, provisions, and the physical conditions present or likely to be encountered.

Contractors are responsible for any damage to utilities or facilities caused by their construction operations. The Contractor shall repair or replace any damaged utility or facility, at their sole expense, to the satisfaction of the owner. Locate existing underground utilities prior to any excavation and shall maintain active utility markings throughout construction. The Contractor shall immediately notify the COR upon discovery of any conflict and await direction before proceeding. The Contractor is responsible for all coordination affecting utilities, including any required relocations.

All work shall comply with: International Plumbing Code (IPC) 2021, Uniform Plumbing Code (UPC), Texas Plumbing License Law (Occupations Code Chapter 1301), OSHA safety standards (29 CFR 1910/1926), and ASTM standards as referenced. Work shall include, but not be limited to:

a.0 Mobilization and Site Preparation:

1.0 The Contractor is responsible for obtaining all necessary permits, including TCEQ approvals for septic system modifications, and providing proof of insurance, bonding, and licensing as required. Davis-Bacon Act wage determinations (29 CFR Part 5) shall apply for labor classifications. The Contractor shall submit a detailed project schedule, submittal log, quality control plan, and safety plan.

2.0 Mobilize equipment, materials, and personnel to the site.

3.0 Establish temporary construction barriers and fencing to protect adjacent areas, including wetlands/estuaries. Use silt fencing and erosion control measures compliant with TCEQ Stormwater Pollution Prevention requirements (30 TAC §305.125).

4.0 Conduct a pre-construction survey with the COR to document existing conditions, including utilities, vegetation, and potential archaeological resources per NPS Resource Management Guidelines.

5.0 Locate and mark all underground utilities.

6.0 Implement dust control, noise mitigation, and traffic control plans to minimize impacts on park visitors and operations.

b.0 Demolition and Removal of Existing Tank:

1.0 Excavate around the existing 1,000-gallon concrete tank to expose it fully, using shoring or sloping per OSHA 29 CFR 1926 Subpart P (Excavations) to prevent cave-ins.

2.0 Anticipate high water table. Pump out and properly dispose of any residual wastewater/sewage in compliance with TCEQ waste disposal regulations (30 TAC Chapter 312) and EPA guidelines (40 CFR Part 503). Obtain manifests for off-site disposal at a licensed facility.

3.0 Remove the tank intact if possible, or break it down in-place if necessary, ensuring no contamination of soil or groundwater. Address any evidence of leaks or infiltration from the unsealed joints by testing soil for contaminants (per ASTM D5088) and remediating if required by TCEQ.

4.0 Dispose of demolished materials (concrete, debris) at an approved landfill, recycling where feasible per NPS sustainability policies. Provide disposal receipts to the COR.

c.0 Installation of New Tank:

1.0 Supply and install a new 1,000-gallon sealed polyethylene wastewater tank meeting NSF/ANSI Standard 61 (for material safety) or approved equivalent and ASTM F714 (for polyethylene pipe and fittings) or approved equivalent. Tank shall be rotationally molded, seamless, with a minimum wall thickness of 0.25 inches, UV-stabilized, and rated for underground burial in corrosive, hypersaline environments.

2.0 Install ballast anchoring system to prevent flotation due to high groundwater: Use concrete ballast slabs or deadman anchors (minimum 4,000 psi concrete per ACI 318) sized per manufacturer's recommendations (e.g., based on tank buoyancy calculations per AWWA M45).

3.0 Secure tank with corrosion-resistant straps: Use Type 316 stainless steel straps with neoprene padding, rated for 5,000 lb tensile strength, compliant with ASTM A240/A240M (for stainless steel) and anchored to ballast with epoxy-coated anchors (per ASTM A775).

4.0 Position tank at the same location/depth as existing (or as adjusted for site conditions, with COR approval), ensuring proper slope for gravity flow (minimum 1/8 inch per foot per IPC Section 704).

5.0 Connect to existing plumbing/inlet/outlet pipes using schedule 40 PVC or HDPE fittings (per ASTM D1785), with watertight seals (e.g., rubber gaskets per ASTM F477). Include risers and access manhole covers (cast iron or composite, traffic-rated if applicable, per AASHTO H-20).

d.0 Backfilling and Site Restoration:

1.0 Backfill excavation with clean, compacted granular fill (e.g., sand or gravel per ASTM D2487) in 6-inch lifts, compacted to 95% standard Proctor density (ASTM D698). Avoid native soil if contaminated.

2.0 Restore surface to original condition: Replace topsoil, seed with native grasses per NPS Vegetation Management Guidelines, and stabilize to prevent erosion.

3.0 Install monitoring wells or access points if required by TCEQ for groundwater monitoring.

e.0 Testing and Commissioning:

1.0 Hydrostatically test the new tank for leaks (fill to capacity, monitor for 24 hours per manufacturer's specs and TCEQ 30 TAC §285.36).

2.0 Test system functionality by simulating flow and ensuring no backups or infiltration.

3.0 Provide as-built drawings, O&M manuals, and warranties for tank and components.

f.0 Demobilization:

1.0 Remove all temporary materials, clean site, and obtain COR approval via final inspection.

5.0 OPTIONAL WORK / TASKS:

None identified at this time. Any additions must be approved via bilateral modification and remain within the PMIS scope and funding constraints.

6.0 GOVERNMENT FURNISHED EQUIPMENT / MATERIALS / OTHER:

a.0 Equipment:

1.0 None

b.0 Materials:

1.0 None

c.0 Other:

1.0 Site access, utility locates (if pre-marked by NPS), and historical site data (provided during site visit).

7.0 SPECIAL CONDITIONS / REQUIREMENTS:

Requirements for a submittal log, Material Safety Data Sheets, Product Data and Shop Drawings, Safety Program including project specific safety plan, Quality Control Plan, Site Cleanup, Construction Barriers and Fencing, Concrete Placements and Site Work, Construction Testing, Environmental Testing, Utility Shutdowns, Accident Reports, As-Built drawings, Site Security, and Warranties.

a.0 Comply with the Padre Island National Seashore Superintendent's Compendium (latest version available at https://www.nps.gov/pais/learn/management/superintendents-compendium.htm or via NPS.gov search; key rules include: No off-road vehicle use; quiet hours 10 PM-6 AM; no discharge of pollutants; wildlife protection per 36 CFR §2.2; cultural resource avoidance per 36 CFR §2.1; and permit-required for heavy equipment. Violations may result in task order termination.

b.0 Prior to final acceptance, the Contractor shall submit the record as-built documents for review and approval. Improper as-built record keeping may require the Contractor to expose buried work at no additional cost.

c.0 Environmental protections: Implement Storm Water Pollution Prevention with best management practices (BMPs) for wetlands/estuaries (per EPA 40 CFR Part 122). Limit work during turtle nesting season (March-October) without COR approval. Hazardous materials handling per 29 CFR 1910.120.

d.0 The Contractor shall provide traffic control in conformance with the FHWA Manual on Uniform Traffic Control Devices (MUTCD).

e.0 The Contractor shall perform site cleanup and disposal on a daily basis or as directed by the Contracting Party or authority having jurisdiction. No separate payment will be made for this work.

f.0 In addition to utilities, the Contractor shall protect all existing public and private improvements. Improvements removed or damaged during construction shall be repaired or replaced, including cleanup, to the satisfaction of the Contracting Party at the Contractor’s expense.

g.0 Incidental work not specifically shown may be required. The Contractor shall furnish and install all supplementary or miscellaneous items necessary for a complete, functional, and acceptable installation at no additional cost.

h.0 The Contracting Party or the Contractor shall pay all inspection and testing fees as required. All fees must be paid prior to partial or final acceptance of the improvements.

i.0 If unanticipated conditions are encountered that differ from the original scope, the Contracting Party shall ensure revised or supplemental plans are prepared and submitted for approval.

j.0 The Contractor shall coordinate their work with all other contractors and utility companies involved in ongoing construction at the site.

k.0 The Contractor shall maintain the project site to prevent dispersal of construction materials, equipment fluids, or contaminants. Equipment maintenance shall be conducted to prevent spills of oily or greasy substances onto the site or into drainage systems.

l.0 The Contractor shall field-verify the locations, invert elevations, and materials of all existing sewer pipes and manholes at tie-in points. If discrepancies exist, the Contractor shall contact the Contracting Officer Representative for direction.

m.0 All sewer pipe and fittings shall conform to manufacturer recommendations.

n.0 Permits shall be secured as required from appropriate agencies.

o.0 The Contractor shall notify the Contracting Officer Representative at least 72 hours in advance of any construction activities.

p.0 The Contractor shall perform exploratory excavations as necessary to locate existing underground facilities sufficiently in advance if conflicts exist.

q.0 It is the Contractor’s sole responsibility to verify the presence and location of all overhead and underground utilities that may interfere with construction, whether known or not. Such utilities shall be protected and maintained.

8.0 PLACE OF PERFORMANCE:

a.0 Padre Island National Seashore b.0 Fee Collection Building (Entrance Station #1, FMSS Location 249737) c.0 Corpus Christi, Texas

9.0 PERFORMANCE PERIOD / SCHEDULE REQUIREMENTS:

a.0 Complete all work within 60 calendar days of notice to proceed, with on-site work limited to non-peak visitation periods (e.g., weekdays, avoiding federal holidays).

b.0 Work during weekends shall be approved by COR.

c.0 Substantial completion with final acceptance within 14 days thereafter.

d.0 Provide a schedule with milestones for excavation, installation, and testing.

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