SOW Water Storage Tank Cleaning and Inspections Aug 12 2020.docx

Scope of Work Inspect and Clean Water Storage Tanks Pinnacles National Park San Benito County, CA

National Park Service

Scope of Work

Inspect and Clean Water Storage Tanks

Background

The National Park Service (NPS), Pinnacles National Park, has a requirement for inspecting and cleaning six water storage tanks, these tanks are a component of the parks water utility systems. These water storage tanks require periodic cleaning and inspection on a cycle of three to five years.

Period of Performance

Estimated to be 9/1/2020 – 10/30/2020 Will be determined at time of award.

Statement of Services

This project will inspect and then clean six water storage tanks on five separate water treatment systems at Pinnacles National Park. Project will use divers to dive into the tanks to clean using vacuums to remove sediment. Divers will then complete an inspection of the entire tank including interior and exterior surfaces and structural and mechanical components. Documentation will include providing a video of all the cleaning work and documenting conditions of the tank through inspections. The inspections will inform us of any deficiencies, health hazards, or resource hazards. Four water storage tank locations are accessible by vehicle, and two are within easy walking distance.

Scope of work:

· Work is to be performed with reservoirs in operation, providing potable water. All work is to meet or exceed California State Water Control Board and American Water Works Association standards for tank cleaning and inspections.

· Work will be performed with minimal impact to the water tanks and work site. All vehicles and support equipment shall be washed and free of any dirt or mud that could transfer foreign vegetation into the Park.

· Clean all sedimentation from the floor, walls and ladder of the tank using a hydro-vacuum system or approved other system that scrubs the tank surface without creating turbidity.

· Discharge of sediment shall be filtered and routed through a dechlorination process with a final chlorine residual <.20. Water then can be discharged on site.

· Inspect man way and entry hatches, seals, supply, drain and overflow piping related to the tank, ceiling, interior and exterior ladders, floor and wall seams, interior and exterior walls coating and vents.

· All work shall be video/audio documented with a high-resolution color video/CD with real time and time log. A single copy of this video/CD will be provided to the Park. A written report will be generated that provides summary of work and findings for each water tank.

· Contractor shall document all areas within the tank requiring additional maintenance or repairs. This contract only addresses cleaning issues and should repairs be required; those needs will be addressed separately.

· Contractor shall be responsible for site clean-up, removing all filtration mediums and any other debris related to this project.

Water Tank Sizes

East Side

West Side

Park Area Locations

All locations are within Pinnacles National Park, San Benito County, California. West Side locations are approximately 13 miles east of Soledad via State Highway 146 through Soledad, CA. East Side locations are approximately 31 miles south of Hollister, CA.

EAST SIDE OF PARK

WEST SIDE OF PARK

East Pinnacles Tank Locations

West Pinnacles Tank Locations

Pinnacles National Park Map

NOTE: Roads are shown in red. State Highway 146 is in the East and West Side of Pinnacles NP but does not connect – it is not a through connection.

Geographic Location.

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