Submitted By
Bill McKenna, Village Engineer/Assistant Public Works Director
Reviewed By
A.M. Zayyad, Deputy Village Manager
Agenda Item Title
Title
A Resolution Approving an Independent Contractor Agreement with National Power Rodding Corporation for the 2024 Ridgeland Ave Sewer Siphon Cleaning & Inspection Project, in an Amount not to Exceed $252,610 and Authorizing its Execution
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Overview
Overview
Proposals were received on October 24th for the 2024 Ridgeland Ave Sewer Siphon Cleaning & Inspection Project. The only proposal was from National Power Rodding Corporation in the amount of $439,455 which is over the budgeted amount. National Power Rodding submitted an alternate proposal which included the same scope of work in an amount of $252,610. Staff recommends awarding a contract based on the alternate proposal amount of $252,610. The project consists of cleaning and inspecting the sewer siphon east of Ridgeland Ave under I‐290 and providing reports of CCTV and chamber inspections.
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Recommendation
Recommendation
Adopt the Resolution.
Background
The project consists of cleaning and television inspection of the Ridgeland Avenue sewer siphon which runs under the I-290 Expressway. The siphon and junction chambers were installed as part of the original I-290 Expressway construction and were last cleaned and inspected in 2013.
The sewer siphon is an inverted sewer siphon which drops the 7-feet diameter sewer on Ridgeland under I-290 and then has it flow back uphill to continue flowing by gravity south of I-290. This is done by changing the pipe diameter to multiple smaller pipes and changing the sewage flow from a gravity flow to a pressurized flow. An illustration showing the sewer siphon is attached for reference. Sewer siphons are a higher maintenance item as the chambers and pipes can accumulate debris and must be cleaned on a periodic basis to ensure they still function. The Sewer Siphon consists of two large junction chambers and three separate sewer pipes of diameters of 54”, 30”, and 14” in an approximate length of 400 feet each and a 12” underdrain.
The Village only received one proposal for this work from National Power Rodding (NPR). The Village’s request for proposals included estimated hours and volumes for the cleaning and inspection work and requested contractors submit hourly and unit rates for these various items. The proposal from NPR based on the Village’s estimated hours and volumes was in an amount of $439,455 which is significantly over the budgeted amount for this work of $175,000. NPR also submitted an alternate proposal, using their same hourly and unit rates, which indicated they could perform the same work for fewer hours than estimated by the Village which resulted in a lower amount based on their hourly and other rates. The alternate proposal was in the amount of $252,610. Staff reviewed the alternate proposal and met with NPR to discuss the alternate and recommends awarding a contract based on this alternate proposal. NPR previously completed the siphon cleaning and inspection in 2013 and is confident they can complete the work based on their revised proposal. The revised proposal provides the Village with the exact same scope of services as the original scope of work.
The work is anticipated to take approximately 3-4 weeks to complete and will be completed before the end of March.
Fiscal Impact
There are available funds for this work in the FY24 Budget in the Water and Sewer Fund, Public Works-Sewer, Sewer Collection, and Capital Improvements account #5040-43750-781-570707.
DEI Impact
N/A.
Alternatives
The alternative to this recommendation could be to delay action to gain additional information.
Previous Board Action
N/A.
Citizen Advisory Commission Action
N/A.
Anticipated Future Actions/Commitments
None at this time.
Intergovernmental Cooperation Opportunities
N/A.