Authority for the Village of Riverlea to take the appropriate and necessary steps to maintain the sanitary sewers and related works within the Village is provided by Ohio Revised Code Sections 715.40 and 717.01.
SSES Project Scope
This section describes the scope of work that is represented by the schedule provided in Appendix B for conformance with the Director's Findings and Orders to the Village of Riverlea, signed and dated February 11, 2009.
The proposed schedule is based on completion of the SSES in not more than five years in accordance with Paragraph 2a of the Orders, and includes all existing public sanitary sewers within the Corporation limits of the Village, with the exception of the City of Worthington trunk sewer, as depicted on the map provided in Appendix A.
Mapping. Using Franklin County Auditor's mapping as base mapping, and sanitary sewer utility mapping provided by the Village, a sanitary sewer base map will be prepared in AutoCad format. Manholes will be numbered. Sewer lengths and slopes will be taken from existing mapping provided by the Village and the City of Columbus. A detailed field survey will not be performed to determine pipe inverts at each manhole.
Records Review. Existing records, complaint history, reports, system mapping, flow monitoring, and other data provided by the Village will be reviewed. Village staff and officials knowledgeable of the system and problems will be interviewed. Operation of the existing pump station will also be observed and discussed.
Cleaning and Televising. The sewers will be thoroughly cleaned and televised. Televising will be done in PACP format and in accordance with the National Association of Sewer Service Companies' "Recommended Specifications for Sewer Collection System Rehabilitation" (latest edition). Records of all internal inspections will be furnished on DVD accompanied by summary diagrams with logs.
Manhole Inspections. Each sanitary sewer manhole that is accessible will be inspected.
Inspections will be recorded on formatted worksheets. Inspection data will cover physical
condition and evidence of inflow/infiltration (I/I). Entry into manholes will not be
Flow Monitoring. The Village sanitary sewer system can be divided into three distinct subareas.
Three flow monitors and one rain gauge will be furnished, installed, and calibrated. It
is anticipated that the flow monitors will be located at the downstream end of each sub-area
utilizing an existing manhole on Riverglen Drive between Falmouth and Westchester Courts,
an existing manhole located at the south end of Olentangy Boulevard, and an existing
manhole located south of the intersection of Melbourne Place and Dover Court (see
Appendix A). Prior to installation, each site will be inspected to determine alternate
locations if the proposed locations are not suitable for flow monitor installation. These
monitors will be maintained for a period of four to six months beginning in the spring to
capture dry- and wet-weather flows. Flow monitors will be programmed to collect data on a
Two groundwater gauges will be installed in the sewer collection system to document the
groundwater level on a weekly basis concurrent with weekly downloading of flow monitor
Flow Evaluation and Report. Following completion of flow monitoring, the collected data
from each of the three sub-areas represented by the flow monitors will be evaluated. Per
capita wastewater flows will be calculated for each sub-area and compared to the acceptable
limits set forth in the 1991 US EPA Handbook entitled "Sewer System Infrastructure
Analysis and Rehabilitation." If both the dry weather and wet weather flows from any of the
sub-areas fall below these limits, then no further SSES work will be performed in that subarea.
The remaining SSES tasks outlined below will be focused on those sub-areas that
exceed the limits set forth in the 1991 Handbook.
Smoke Testing. The sanitary sewers within the remaining target sub-areas will be smoke
tested to further isolate and identify sources of I/I. Data will be recorded on formatted
worksheets. Smoke testing will be performed in midsummer to early fall to maximize the
results of this task.
Dye Testing. Dye testing of storm sewers, pavements, downspouts, and lawns in the
vicinity of sanitary sewers and manholes will be performed in select areas based on the
smoke testing results to further identify sources of I/I. Dye testing will be performed with a
television camera in the sewer to document confirmed I/I sources.
The final report [pdf] will identify sources and quantities of clear water infiltration and inflow found
during the field study along with any structural and hydraulic deficiencies found. Feasible, cost
effective solutions for remediation will be presented. Projects will be prioritized based on severity,
overall effectiveness for I/I removal, and expected funding availability.
Mapping will be provided that shows the location, size, and capacity of all sewers, manholes, and the
pumping station located within the study area. Appendices will include the manhole inspection and
smoke testing field records, and the flow monitoring, rain gauge, and ground water data. Television
inspection DVDs with the accompanying diagrams and logs will also be included.
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