Inflow and Infiltration Projects
KEM prepared design plans and administered the construction for the first three phases of Ontario's Inflow & Infiltration (I/I) Reduction Program. The City's sanitary collection system consists of over 90 miles of 8 to 24-inch diameter gravity sewer pipe which has experienced significant I/I. The primary goal of the project was to eliminate overflows at the Rock Road Lift Station. It was determined that a major source of I/I was from clay building laterals, with the sub-area to the Lift Station containing approximately 230 laterals constructed in the 1950's. KEM prepared design plans to rehabilitate 120 of these laterals, which included digging and replacing nearly 2,700 feet of 6-inch clay lateral with PVC pipe, installing 81 cleanouts and lateral-to-main liners, installing 22 sectional liners, and abandoning 39 unused laterals.
KEM was hired to identify sources of inflow and infiltration into the sanitary sewers in a portion of Olmsted Township on the west side of Cleveland. There are a total of 1,200 homes in the project area built between 1960 and 2000. During wet weather, several homes at the downstream end of the project area have experienced basement backups. KEM provided flow monitoring analysis and developed a SewerGEMS sanitary sewer model to locate areas of high I/I and performed dye testing to locate specific locations of I/I on both private and public property. Based on the sanitary sewer model and testing, remediation plans and cost estimates were developed to mitigate the sanitary sewer backups into basements.
KEM performed an SSES study and administered a rehabilitation plan to reduce excessive I/I within the sanitary collection system tributary to the Harp WWTP. The collection system consists of 17 manholes over 3,600 feet of 8-inch diameter clay gravity sewer pipe installed in the 1970's. KEM reviewed the existing plans and reports of the area, conducted flow monitoring at the influent sewer to the wastewater treatment plant, performed a GPS survey of the location, depth and size of the collector sewers and manholes, prepared a schematic of the sewer system, and prepared a report of all findings and recommendations. A subcontractor was hired to clean and televise the mainline sewers and laterals. Rehabilitation work included pressure testing and grouting all joints in the mainline sewers and lateral wye connections and installing sectional liners in locations where the mainline had structural deficiencies. As a result of the rehabilitation work, peak wet weather flows at the wastewater treatment plant have been reduced significantly.
KEM was hired to assist the Village in eliminating two Sanitary Sewer Overflow (SSO's) located within the collection system as required in their NPDES permit. KEM performed a system wide GPS survey and manhole evaluation. Based on the findings, plans and specifications were developed for the rehabilitation of 109 manholes. The rehabilitation of said manholes was the initial phase in the I/I removal schedule. The project also consisted of the cleaning and televising nearly 6,500 lineal feet of sanitary sewer mainline, testing and grouting mainline pipe joints, and performing necessary point repairs. The project was 75% funded by a grant from the American Recovery and Reinvestment Act (ARRA) with the remaining 25% coming from local funds.
KEM was hired to implement an I/I reduction program for the Village which included evaluations of the manholes and mainline in the collection system and development of plans and specifications for the rehabilitation of 32 manholes and rehabilitating over 8,500 feet of 8 and 10 inch sanitary sewer. Plans and specifications included adjusting and sealing manhole castings, sealing manhole walls, sealing pipe entrances, installing new inner chimney seals and manhole lids and frames and installing cured-in-place pipe liners in the sanitary sewers. The project also included the installation of three flow meters and the collection of the flow monitoring data to be utilized by the Village in the future to focus efforts on areas with the highest I/I rates. The project was 25% funded by an OPWC grant, an additional 50% with an OPWC loan, and the remaining 25% with local funds.
KEM performed flow monitoring, smoke testing and CCTV data review for a 1,200 home area within Lorain County, Ohio. Results of the study identified a water main break that was resulting in drinking water entering the sanitary sewer and 37 locations where inflow and infiltration were entering the sanitary sewer through private property connections were identified. KEM coordinated the efforts to identify and repair the water leaks and private property I/I sources.
Preparation of a preliminary plan, ARRA grant and OWDA loan work, design plans, bidding, construction administration and observation services were all included for the County's I/I Reduction Program. Improvements included the cleaning, televising, smoke testing, CIPP lining and flow monitoring of the County's complete sanitary collection system. Rehabilitation included: 64,000 feet of CIPP lining, 253 manholes rehabilitated, and 1,100 service connections were reinstated.