Project Description The City plans to drill three new municipal water supply wells starting this year, 2025, and complete the third well by March 2026. These will become the City’s Wells 18, 19, and 20. The bid package for this project is planned for distribution to the Qualified Candidates in August 2025. The estimated drilling contract completion is March 2026. The Project consists of borehole drilling, construction, and development of three nominal 16-inch and 18-inch diameter wells utilizing reverse-circulation drilling methods. The well construction details are still being refined. The final designs will be based upon previous exploration drilling and monitoring well construction at each site (by others), and the final well designs will be included within the project bid package that is distributed to potential bidders. For initial planning purposes, below is a summary of the preliminary construction details: Well 18: 16-inch diameter Stainless Steel well casing and screen set to a depth of 560 feet, all within a 28-inch borehole. • Approximate Location: 38.337679, -121.921540°, Fry Road, Solano County, CA. • Anticipated Capacity: 500-800 gpm • Anticipated Schedule: 10/15/25 – 12/9/25 (40 days) Well 19: 18-inch diameter Copper Bearing Steel to a depth of 680 feet, 16-inch diameter Copper Bearing Steel to a depth of 1,685 feet, and 16-inch diameter Stainless Steel casing and well screen set to a depth of 1,867 feet, all within a 28- inch borehole. • Approximate Location: 38.416144, -121.934007°, Midway Road, Solano County, CA. • Anticipated Capacity: 1,500 – 2,000 gpm • Anticipated Schedule: 12/10/25 – 3/3/26 (60 days) Well 20: 18-inch diameter Copper Bearing Steel to a depth of 750 feet, 16-inch diameter Copper Bearing Steel to a depth of 1,290 feet, and 16-inch diameter Stainless Steel casing and well screen set to a depth of 2,303 feet, all within a 28-inch borehole.
