Statement_of_Work_-_Icehouse_Septic_System.pdf

CUMBERLAND ISLAND NATIONAL SEASHORE

PMIS CUIS_335945

REPLACEMENT OF ICEHOUSE COMFORT STATION SEPTIC SYSTEM

NATIONAL PARK SERVICE (NPS)

1.0 PROJECT INTRODUCTION AND JUSTIFICATION

1.1 BACKGROUND

The current septic system at the Icehouse Museum on Cumberland Island was installed in 2004 at the Dungeness Landing area. The existing septic tank is an 1100-gallon concrete tank with a a 6” slab lid.

The Wastewater System Condition Assessment performed in 2022 by HDR Engineering has called for the system to be updated to a 1200-gallon minimum effective capacity septic system due to increased visitation numbers since 2004. The assessment also recommends relocating the system to avoid the damage to the drain field by a heritage live oak in close proximity to the septic system. The septic system will service a total of five (5) water closets, four (4) lavatory sinks, and one (1) water cooler.

1.2 Justification

The project is funded with Park Fee Revenue and is considered critical to continue providing a safe and sanitary comfort station at the Icehouse Museum. The current undersized septic system cannot meet the 1200 Gallon/Day demand from day visitors during peak demand use of the facilities. The park will move the septic system to the North of the Icehouse Museum Building to avoid conflict with heritage oaks trees. A project savings will be accomplished by abandoning and filling the existing septic system after pumping the system dry. The infiltrator drain field will be abandoned in place as well. The new drain field will be constructed with to perforated PVC pipe to avoid damage from equipment passing over the drain field.

The Park will maintain the system according to the O&M Guidelines (311-3-1-.17) from the Georgia Department of Public Health On- Site Sewage Management System rules to ensure maximum life cycle of the new system. The installation will decrease O&M costs, requiring fewer pump services and fewer correct maintenance work orders.

2.0 Scope

This action will replace one (1) 1100-gallon concrete septic tanks, the distribution pipe and structures, and the drain field components. The concrete tank walls shall be collapsed into the bottom of the tank.

The lid will be placed on the remnants of the abandoned tank and backfilled. The system will be replaced with one (1) 1500-gallon multi-chambered polypropylene or fiberglass tanks. The action will include installation of one (1) in line building sand trap that will decrease sand settlement in the tanks.

The drain field shall be 650 square feet. The disturbed turf areas shall be graded and seeded.

2.1 Tasks

Division 2: Utility Demolition

1. The contractor shall pump out one (1) existing concrete septic tank.

2. The contractor shall collapse the concrete walls into the base of the septic tank. The 6” slab lid shall be lowered onto the remnants of the existing tank.

3. The contractor shall backfill the void left by the tank as quickly as possible to ensure the safety of wildlife and visitors.

4. The contractor shall remove the distribution box for the existing drain field infiltrator system.

5. The drain field shall be abandoned in place.

Division 33: Utilities

1. The contractor shall excavate and install one (1) 1500-gallon multi-chambered polypropylene tanks to the

North of the comfort station.

2. The contractor shall install risers with sealed pedestrian rated lids that allow the owner to inspect the inlet and outlet of the tank.

3. The contractor will install an exterior sand trap at the main drain line to the distribution box. The trap shall be no more than 5’ from the building.

4. The contractor shall route outlet drain from the into a correctly sized distribution box with outlets that accommodate the flow from the septic tank to ensure proper and equal distribution to the drain field.

5. The contractor shall install the 650 square foot drain field. The contractor shall mark the corners of the drain field with flags to allow for proper GPS marking of the drain field boundary.

6. The contractor shall install the drain field that ensures uniform flow of effluent throughout the system.

7. The contractor shall backfill and install the septic tanks in accordance with Georgia Department of Public

Health Manual for On-Site Sewage Management Systems, Rules of the Department of Public Health Chapter 511-3-1.

8. Contractor shall backfill and install the septic tanks in accordance with Manufacturer’s Specifications.

Division 32: Site Improvements

1. The contractor shall ensure that all areas of excavation or ground disturbance are backfilled and graded.

2. Contractor shall spread 10 pounds Bahia Grass seed per 1000 square feet.

3.0 Bid Requirements

1. The successful bidder shall include all costs associated with materials and installation of the upgraded septic system.

2. The successful bidder shall include proof of current certification as a Septic Tank Installer by the Georgia Department of Public Health for work. Any bid package not including a certification shall not be considered by the COR.

3. The successful bidder shall verify that cost of materials and labor includes septic tanks supplied by a manufacturer certified by the Georgia Department of Public Health.

4. The successful bidder will provide a tentative schedule illustrating the durations for individual tasks and the total duration of the completed work.

4.0 Deliverables

4.1 Post Award

Prior to issuance of an NTP

1. Safety Plan shall include protection measures during work adjacent to the Historic Resource

2. Waste Management Plan

3. Notification of the Qualifying Employee

4. Certificates of Insurance

5. Refuse Management Plan

6. Materials Submittals for Division 33 and Division 32

7. Shop Drawings

5. Shop Drawings shall include plan view of the septic system.

a) Plan view shop drawing shall include Inlet and Outlet invert heights of all structures.

b) Plan view shop drawing shall include the drain slope called out.

4.2 Close-Out

1. The contractor shall provide a 1-year warranty for installation workmanship.

2. The contractor shall provide a 5-year warranty for the septic tanks covering materials and workmanship.

3. The contractor shall provide an as built shop drawing to illustrate any changes made in the field during installation.

5.0 Compliance and Resource Protection

5.1 Natural Resources

1. Soil: Intact native topsoil from the project area shall be retained whenever feasible. Should additional fill be needed, all fills must be of quality suitable for use in a National Park Unit. Any fill materials required for the project must be obtained from a park-approved source.

2. Soil Erosion: Protect against erosion and topsoil depletion.

3. Exotic Vegetation and Noxious Weeds: Prevent introduction and minimize spread of exotic vegetation and noxious weeds.

4. Wildlife: Do not intentionally disturb wildlife nesting, breeding, or other activities.

5. Visitor Experience: Provide the Project Manager with the project schedule as soon as it is known and provide periodic updates of project work. Should closure or rerouting of visitors be necessary, closures would be for the minimal time required to complete the work activity or correct the problem.

6. Construction Debris: All construction debris and removed material shall be transported outside the park and properly disposed of at an approved off-site location(s) in accordance with federal, state, and local regulations.

5.2 Cultural Resources

1. Ground Disturbance: If ground disturbance is anticipated, an Archeological Monitor may need to be present at work site. If archeological resources are discovered at project site while Archeological Monitor is absent, immediately stop work in vicinity of discovery and report discovery to Contracting Officer’s Representative. Any necessary archeological monitoring shall be conducted by the Cumberland Island National Seashore Resource Protection Division.

2. The Icehouse is an Historic Resource on Cumberland Island. The contractor shall make all efforts to ensure this resource is undamaged during the contracted action.

6.0 Security

The Contractor shall be given access to the work area by an NPS employee. The contractor shall not be supplied with keys to Government buildings or facilities.

7.0 Place of Performance

Cumberland Island National Seashore; Dungeness Landing, Icehouse Museum

9.0 Period of Performance

Work shall be completed within 6 months contract award.

10.0 Payment

A Pricing Schedule shall be furnished by the contractor before the start of work. Payments shall be based on work completed per the Pricing Schedule.

The contractor will notify the Contract Officer when all work is complete. The Contract Officer’s Representative will inspect work and issue a list of deficiencies (punchlist). When the deficiencies have been corrected by the contractor and re-inspected by the COR, final payment will be approved.

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CUMBERLAND ISLAND NATIONAL

SEASHORE WASTEWATER SYSTEMS

CONDITION ASSESSMENT

Ice House Museum Wastewater System The system consists of a below grade septic tank and drain field. There were no observable conditions of the drain field, however, a large 6-foot diameter oak tree is located in close proximity to the septic tank and drain field. It is recommended that the septic tank and drain field be relocated to the north side of the building to avoid possible root intrusion of the drain field piping.

The septic tank lid consists of a solid 6-inch-thick concrete slab requiring heavy machinery to lift for access. The tank is 68” wide by 134” in length and a 5’ depth. Fixtures for his system include: 5 water closets, 2 urinals, 4 bathroom sinks. Park staff noted that the concrete lid is fractured in several locations and continues to degrade. This system is reported to be the most heavily used in the park because it is located at the entrance to park. Over the last two years this septic system has required cleaning and pump-out six times due to backups.

The capacity of this system has been determined to be inadequate based on the estimated usage. With 1200 GPD peaks (previously estimated 500 GPD) in the summer, the Florida Department of Health Code Standards requires a 2200-gallon minimum effective capacity septic system.

No maintenance records were available; however, a schematic of the system was provided by park staff.

The below table summarizes the findings of the condition assessment and information provided by park staff.

Table 10 Ice House Assessment

Unit Process and Parameters Values

Details

Material Concrete

Capacity 1100 gallon

Installation 2004

Condition Old but usable condition (routine pump-outs required)

Percent Filled at Assessment 100%

Last Pump-Out June 2022

Usage 1200 GPD summer | 400 GPD winter (given park toilet standard)

Services Men (2) Toilets/Sinks | Women (3) Toilets/ (2) Sinks | (1) Drinking Fountain

Ratings

Condition Assessment Rating 4

Reliability Assessment Rating 5

WASTEWATER SYSTEMS

CONDITION ASSESSMENT

Figure 24 Ice House Exterior

Figure 25 Ice House Septic Tank Cover

WASTEWATER SYSTEMS

CONDITION ASSESSMENT

Figure 26 Ice House Wastewater Schematic (NPS)