2008-03-25_PWETC_AgendaPacket - Laserfiche WebLink

Home

City of Roseville March, 2008 VII. Recommendations for next steps The flow data Collected during 2007 generally provided some background information and response data for a limited storm event following a very dry summer period. We would recommend conducting additional flow metering in several locations. 1) A new location should be identified to estimate the flow from Area A. 2) Area D should be subdivided into three areas. 3) Two or three temporary meters should be installed on the MCES interceptors to subdivide the MCES line as well as estimate flows from the currently un-metered areas, We would also recommend calibrating the lift station pumps at lift stations 4, 5, 9 and 13 to supplement the flow data available from the temporary meters. The Fernwood Lift Station (#13) is located within the area of temporary meter D. Table 7 includes a summary of typical Ill sources, investigative procedures that are designed to identify these sources, and rehabilitation options typically associated with the particular source. This is not an exhaustive list but can be considered a guide for the next steps in the Ill identification and rehabilitation process. Table 7 -Summa of T ical I/I Source, Investi ation Procedures, and Rehabilitation 0 tions Infiltration Potential Source Investigative Procedures Rehabilitation Options or Inflow Inflow Manhole Covers Smoke Test Replace Cover Physical Survey Raise Cover Seal Cover Rim Area Inflow Area Drains Smoke Test Re-route flow to storm sewer or surface dischar e Inflow Roof Drains Building lnspection Re-route flow to storm sewer or surface Smoke Test discharge D e Test Infiltration/ peteriorated Adjustment Manhole Inspection Replace rings and seal Inflow Rings Install sealing product (Chimney seal, Infi- shield) Infiltration/ Sump Pump Connection Basement Inspection Re-route discharge out of basement to Inflow surface Infiltration/ Direct Foundation Drains TV inspection of service pipe Re-route to sump pump and discharge Inflow outside basement to surface Infiltration/ leaking Service pipe TV inspection of service pipe Replace service pipe Inflow Install CIPP Liner Infiltration Manhole wall seepage Manhole Inspection Grout Injection Replace Manhole Install Manhole Liner Infiltration Pipe Joint Leakage Televise sewer main Joint Grouting CIPP Lining Pi e Re facement In the Meter Areas D and H initial investigation efforts should be focused on possible private property type sources. Investigation should include sump pump surveys of individual properties and televising individual service lines during wet conditions, Some communities have had reasonable success televising the service lines from the main sewer using a remote camera. This process is less expensive and significantly less intrusive than attempting to televise services from the basement of a property. In consideration of the potential problems with basement access, we would recommend attempting to televise several service lines in several areas of these service areas to test the procedure and view the results prior to widespread implementation of a program. Since sump pump inspections can be a difficult project and the cost implications can be significant, the program should be implemented throughout the entire community with priority areas defined by the identified inflow areas. In the Meter Areas B, D, E, F, and G initial investigative efforts should be focused on direct inflow sources, with smoke testing some suspect areas, physical survey of manholes, roof leader inspections, and dye testing Page 10 of 12