New Castle, Delaware – Using results and recommendations developed from a multi-phase, multi-year sewer inspection program of New Castle County’s White Clay Basin, rehabilitation and replacement designs were developed to remediate I/I. A 30-inch sewer was also realigned to alleviate a hydraulic restriction at an old meter vault. Hydraulic modeling was performed to develop and validate design recommendations.
Batavia, Illinois – The City of Batavia sewer system dates back to the early 1900s. As such, a number of its pipelines were aging and in need of rehabilitation to restore sanitary sewer system capacities. Under a Master Services Agreement, RJN engineers have been providing manhole and pipeline rehabilitation design services targeting deteriorating assets. Services have involved condition inspections to verify conditions, CCTV video review, design/cost estimating, and resident engineering services.
Effingham, Illinois – The City of Effingham began a proactive program to assess the condition of its sanitary collection system due to an upcoming renewal of the wastewater treatment plant’s NPDES permit. RJN is assisting the City with a program providing condition inspection services, field survey and GIS mapping updates, and design for remediation of inflow/infiltration sources.
Tulsa, Oklahoma – In December 1990, the Oklahoma State Health Department (now ODEQ) placed the City of Tulsa under a Consent Order due to wastewater overflows and system backups (SSOs). The City hired RJN in 1993 to conduct a comprehensive sewer study, including hydraulic modeling, of the Coal Creek sanitary sewer basin. RJN followed the study with a plan for design of priority 1 through 4 capacity improvements throughout the basin to eliminate chronic rain-induced SSOs.