Wastewater Disposal System Reconstruction
Ashaway Line & Twine
Ashaway Line & Twine Mfg. Co. retained us to provide an evaluation of performance issues associated with their wastewater disposal lagoon system, and re-design the existing system to bring it into compliance with RIDEM permit requirements. The existing wastewater disposal lagoon system consisted of an 18-inch diameter pipe and a 50-foot by 65-foot lagoon. The wastewater transport pipe ran underground between the facility dye house and lagoon. Dye house wastewater was discharged into the lagoon. The bottom of the lagoon was approximately two feet below the water table. As such the lagoon system did not infiltrate rapidly enough to keep pace with the wastewater discharged from the Lower Plant. This caused overflows and violation of the UIC permit.
We evaluated the existing system, site constraints, future plant expansion, and designed a new disposal system which included a pump station, to control the discharge flows, a settling basin for pre-treatment of the wastewater and a new crushed stone infiltration basin, with a separate distribution piping system for winter and summer discharges. We also provided our client with bidding assistance, shop drawing review and construction management services to ensure the system was constructed as designed. The construction was sequenced so that the plant remained in operation throughout the construction process.