The SWRCB Division of Financial Assistance (DFA) has funded activities to address aging infrastructure for the municipal water system that is operated by North Yuba Water District (NYWD). The work is being conducted under Proposition 1 Technical Assistance and Support Program funding through the SWRCB, Agreement No. 016-12810, Work Plan No. 4999. The proposed project is the replacement of an existing water storage tank (the Challenge Tank} that is part of the domestic water supply system owned and operated by the NYWD. The Challenge Tank has exceeded its designed lifespan and leaks continuously. Replacing the existing leaking tank will eliminate a major source of water loss for the NYWD. The project budget estimate to replace the Challenge Tank is about $500,000. The Challenge Tank is located on Old la Porte Road, within the town of Challenge, California, in Yuba County, California. The tank is situated on a small parcel (approximately 0.5 acres; APN 050-110-220} leased from the U.S. Forest Service Plumas National Forest. The existing tank was built in 1965. The cylindrical tank is 18 feet tall and 32 feet in diameter and has a storage capacity of 100,000 gallons of water. The tank was made from redwood staves and steel hoops and is bolted to a concrete foundation. Ancillary facilities consist of a valve control box and an access driveway. The existing tank is leaking and will be replaced with a metal tank of similar dimensions. The estimated construction time is three months. After removing the old tank and foundations, a new reinforced concrete foundation will be cast in the same area as the existing foundation. The new tank will be assembled with pre-fabricated bolted steel or welded steel plates. A new valve box containing valves and piping will be installed in the ground. The new valves will regulate the water level in the tank. Similar to the existing system, treated water will gravity feed into the tank via an existing supply pipeline (6-inch steel pipe). The treated water comes from the NYWD water treatment plant in Forbestown. The Challenge Tank project area was defined as the combined perimeter of the tank foundations, the valve box, and the driveway, and is about 4,000 square feet (the "Project Area" or "Action Area"). This project does not include the other planned upgrades to the NYWO water system: water service meter upgrades and conversion of flumes to pipelines.