B08_Attachment_1_Statement_of_Work.pdf

RFQ #140P8524Q0024 - Inspection and Cleaning of Water Storage Tanks Page 1 of 3

Statement of Work

INSPECTION AND CLEANING OF WATER STORAGE TANKS

Yosemite National Park Objective:

Yosemite National Park requires inspection and cleaning of water storage tanks.

Background:

Yosemite National Park is located 3 hours East of San Francisco, California in the Sierra Nevada Mountain range. Elevations are between 2,000 feet and 9,000. Yosemite is frequented by all types of weather from hot and dry temperatures to cold/snowy wet conditions. Specific areas within Yosemite National Park are closed during the winter season which can last from October through June. The tanks for this requirement are located in Wawona. Wawona is located at the southern end of Yosemite on Hwy 41 at approximately 4,000 feet elevation. The tanks listed in Table 1 range from 4,500 – 5,000 feet elevation. See attached map that provides the location of the Wawona district area of where the tanks are located.

It is unknown when the last cleaning and tank inspection occurred. The amount of sediment, sludge, and debris in each tank is unknown; all sediment is required to be removed from the tanks.

Requirement:

The contractor shall perform all the work and shall furnish all of the supplies, materials, equipment, supervision, labor, and inspection necessary for completion. The Contractor shall:

1. Perform inspection and cleaning of interior area and surfaces of the water tanks listed in Table 1 below. This shall be done while maintaining an active water system on selected tanks unless National Park Service (NPS) can maintain a bypass to allow each tank to be drained during the work. (This is not preferred).

1.1 Inspection Exterior/Interior: Adhering to American Water Works Association (AWWA) C652-11 (or most current) The inspection shall be completed by a trained and qualified inspector as stated in AWWA D101-53. The purpose of inspection is to determine if repairs are required and, if so, the exact nature and extent of the work required. The inspection should outline specific maintenance needed to restore the tank(s) in good condition and submitted to the Contracting Officer’s Representative (COR). For more information, please see the Deliverables section.

1.2 Cleaning: All sediment, sludge and debris shall be removed from the tank’s interior.

Tank shall be disinfected per AWWA standards C652-02 (or most current) prior to placing back in service. Written permission is required from the Utilities manager prior to returning to service. Contractor shall be responsible for all removal and disposal outside of the park, of any materials or sediment in coordination with NPS.

1.3 Return Tanks To Service: Any chemical contamination shall be eliminated by means of neutralization and/or flushing. Tank shall be disinfected per AWWA standards C652-11

RFQ #140P8524Q0024 - Inspection and Cleaning of Water Storage Tanks Page 2 of 3

(or most current) prior to placing back in service. Written permission is required from the utilities manager prior to returning to service.

2. Contractor at a minimum shall provide the following safety and security measures: secure all work areas from unauthorized access by installing temporary worksite fencing and signage.

Contractor may also have to implement controlled access points as required. A Site Safety and Security Plan will be required to be submitted and approved prior to start of period of performance. For more details, please see Deliverables section.

3. Upon completion, the work area shall be left clean of debris and trash associated with the work.

Table 1. List of tanks included in Statement of Work Tank Location Size (Gallons) Material Additional

Information

Wawona Upper Zone 1 337,500 Steel Welded No Electrical power available, unpaved steep dirt road , minimum 18” hatch opening

Wawona Upper Zone 2 337,500 Steel Welded No Electrical power available, unpaved steep dirt road, minimum 18” hatch opening

Wawona Lower Zone 1 250,000 Steel Welded No Electrical power available, unpaved steep dirt road, minimum 18” hatch opening

Wawona Lower Zone 2 250,000 Steel Bolted No Electrical power available, unpaved steep dirt road, minimum 18” hatch opening

Period of Performance:

Period of performance shall begin approximately 1 June 2024 and a completion date of 30 August 2024.

An early start date may be approved dependent on weather and accessibility to site. The weather during this time of year tends to be dry and warm. Contractor shall schedule and execute in the minimum time necessary as to reduce impact to the system and customer.

RFQ #140P8524Q0024 - Inspection and Cleaning of Water Storage Tanks Page 3 of 3

NPS Responsibilities NPS will notify customers in the area of work proceeding with regards to site safety and system impact.

NPS will be responsible for bypass of water tank, if applicable, during the time of work by the contractor, in conjunction with the dates set forth by the project schedule submitted by the contractor.

Deliverables:

The following deliverables are required in addition to requirements list above:

1. Site Safety and Security Plan: Prior to start of period of performance, contractor shall submit and receive approval on a Site Safety and Security Plan. The Site Safety and Security Plan shall provide a description of planned security measures that addresses security and safety requirements listed in the Requirement section above.

2. Provide a finalized schedule of cleaning by location 2 weeks prior to work beginning. This will aid in NPS informing other employees/contractors in the area of the intended day of impact to these locations, if applicable.

3. Written Guarantee: The contractor shall provide NPS with a written guarantee that clearly states all work was performed in accordance with the specifications and the standards stipulated herein and shall guarantee work against defects due to premature material failure, faulty workmanship or improper application of materials which may appear for a period no less than one (1) year following NPS’s final acceptance of the completed work. Contractor shall supply photo documentation of tank condition before and after cleaning. The written guarantee must cover any and all supplies, equipment, material and labor that are necessary to correct any and all defects which may occur during the term of the guarantee.

4. Inspection Report: It is anticipated that the inspection may identify failures. The contractor shall provide written recommendations for further action related to the tanks, including estimates for future repairs. An electronic version shall be provided upon completion with recommendations.