Louisa Street Stormwater Pond Retrofit and Sewer Replacement (Re-Bid)

The City of Columbia is seeking a qualified contractor to retrofit an existing dry‑detention stormwater pond on Louisa Street into a permanent wet retention basin and to relocate a sanitary sewer line. The work includes demolition of existing fencing, trees, and debris; excavation, grading, and construction of drainage structures, pipe, and a new pond control structure; installation of new chain‑link and privacy fencing; extensive revegetation, seeding and sodding; and full compliance with city, state and federal regulations. The contract will be awarded to the lowest responsive bidder and includes all labor, materials, equipment, testing, traffic control, and post‑construction maintenance required for successful completion. • Convert dry detention basin to wet retention pond with added storage volume. • Relocate and install 12‑inch PVC sanitary sewer pipe with associated manholes and bypass pumping. • Perform clearing, grubbing, demolition, excavation, grading, and back‑filling. • Construct drainage structures, riprap, erosion control, and storm‑water inlet systems. • Install new 6‑ft chain‑link and privacy fencing with gates. • Provide site‑wide traffic control and maintain access throughout construction. • Complete landscaping: topsoil placement, seeding, sod installation, fertilizing, and irrigation. • Submit all required submittals, testing reports, and as‑built documentation.