===== PDF PAGE 19 ===== [Extraction: embedded PDF text] CITY OF WEST CHICAGO INFRASTRUCTURE COMMITTEE AGENDA ITEM SUMMARY ITEM TITLE: AGENDA ITEM NUMBER: _S..;;.__-=-' H_--"-- Sanitary Sewer System Evaluation Survey (SSES) COMMITTEE AGENDA DATE: June 2, 2022 COUNCIL AGENDA DATE: NA ,,r-STAFF REVIEW: Mehul Patel, P.E., CFM, Director of Public Works SIGNATURE ~ Q ---- APPROVED BY CITY ADMINISTRATOR: Michael L. Guttman SIGNATURE _________ _ ITEM SUMMARY: In 2010, the City completed its first professional services contract to perform a Sanitary Sewer Evaluation Survey (SSES). The primary purpose of an SSES is to find defects in the sanitary sewer collection system to reduce the Inflow and Infiltration (I/I). I/I is defined as follows: Infiltration is groundwater that seeps into sewer pipes through holes, cracks, joint failures, and faulty connections and other openings. Inflow is stormwater that rapidly flows into sanitary sewers via roof drain downspouts, foundation drains, storm drain cross-connections (field tile or yard drain pipe tied into sanitary), sump pump connections that are illegally connected to the sanitary sewer as well as through open holes in manhole covers. I/I is water that ultimately makes its way to the Wastewater Treatment Plant (WWTP) and makes its way through the treatment process, but does not need to be treated. The reasons for reducing I/I are: - it jeopardizes the sanitary sewer collection system by reducing the capacity of the pipes; - this additional flow in the sanitary sewer collection system may result in flooding, basement backups, as well as the need for larger sewers and/or treatment plant capacity expansion; and/or - increased sewer user fees to offset additional cost of operations for wastewater treatment. The City has conducted SSES studies in 2010, 2011, 2013, 2014, 2016, and 2018. The defects are found via dye testing, smoke testing, sewer televising, and manhole inspections. As part of these studies, accurate location of City infrastructure such as manhole locations was also captured in a Geographic Information System (GIS) database. The SSES studies have evaluated the sanitary sewer collection system as a whole and identified needed repairs. The repairs are identified in the entire sanitary sewer collection system including both the public and private sides. The private component would be any plumbing inside a home/business and all of the associated sewer lateral piping to the right-of-way or property line. In the case of an apartment complex or an industrial/commercial building, the entire system leading up to the connection with the sewer main would be considered private per City Code 18-61 (a). The public component consists of all components in the public right-of-way, mainline sanitary sewer, sewer laterals up to the right-of-way, sanitary manholes, lift stations, and force mains. The City has completed critical repairs identified in the SSES studies over the years; however, these studies have also identified numerous repairs that are non-critical, but need to be addressed in an effort to help reduce system-wide 1/1. As of May 2021, the repair costs of such items ===== PDF PAGE 20 ===== [Extraction: embedded PDF text] CITY OF WEST CHICAGO on the public side are estimated to be $5.8 million. These costs are likely to be significantly higher today based on industry trends and inflation adjustments. As of May 2021, the repair costs of such items on the private side are estimated to be $2.1 million. Please note, a large portion of these costs is due to deficiencies identified in major apartment complexes. These costs are likely to be significantly higher today based on industry trends and inflation adjustments. To date, the City has not required property owners to make repairs to private portions of the sanitary collection system, perhaps because the primary focus has been on correcting the public side deficiencies as well as other reasons such financial impacts to the residents, staff time, and availability to enforce the repairs. Per Sections 18-61 and 18-64-1 of the City Code, the City can enforce repairs to be made by current property owners at their expense. Enforcement would be conducted through the Community Development Department's inspectors who are contractors from B&F Construction Code Services. The City's contractor does have the availability to perform inspections for this type of work. Each repair listed would require at least one inspection along with several notices to be issued. It is estimated the current cost for each inspection would be $50. This leads to an estimated total inspection costs of $150,000 for the issues identified on the private side. Please note permit costs are excluded. Historically, the City has budgeted between $500,000-$900,000 per year to perform the SSES studies and to address the repairs identified on the public side. As mentioned above, to date the City has not completely addressed all identified deficiencies due to cost limitations. Staff is seeking direction from the Infrastructure Committee on how to move forward . In an effort to help decision making, staff has compiled the following options along with pros/cons of each option. Option Pros Cons A) Do Nothing - The budgeted costs for - No reduction in I/I SSES can be allocated to - Violation of special other needs National Pollution Discharge Elimination System (NPDES) condition permit to properly maintain sewer collection system - Triggerexcessftow events at WWTP - Sanitary sewer capacity reduction resulting in backups - HiQher treatment costs B) Address deficiencies on Structural rehabilitation of - Not addressing the inflow public side including sewer mains and portion of the I/I sanitary sewer cured in manholes - Partially addressing the place pipe, manhole - Stopping infiltration at infiltration by not lining lining, 5-feet lateral lining pipe joints and sewer entire laterals connections - Can trigger excess flow - Provides cleaning and events, perhaps less televising of sanitary frequent than option A sewers - Can trigger higher - No out of pocket cost for treatment costs, perhaps residents less than option A ===== PDF PAGE 21 ===== [Extraction: embedded PDF text] CITY OF WEST CHICAGO C) Address both public and Correcting all identified Most financial impacts to private deficiencies defects residents that need to Most reduction of I/I correct identified Less treatment costs deficiencies Most amount of staff time required for enforcement actions Highest financial impact to the City The cost of SSES studies are substantial, generally about $100,000 to $150,000/year. A large portion of this study cost is in televising and cleaning of the sanitary sewers. One advantage of doing SSES studies ahead of time is that the City will know exactly where the defects are in its system. There are a couple of different options the City can pursue to address these issues. 1) The City can participate in an annual joint bid through Municipal Partners Initiative (MPI) for cured in place pipe (CIPP) lining in DuPage County; however, this program is generally limited to only CIPP and does not include manhole or partial lateral lining. 2) Alternatively, staff can continue to work with RJN Group to prepare bids for a standalone CIPP project coupled with manhole lining as well as partial lateral lining for the City. As part of any CIPP contract, the contractor is required to perform cleaning and televising before and after the CIPP application. Staff's recommendation is to move forward with Option B using RJN Group to prepare bid documents for standalone City project and not perform any further SSES studies until all previously identified deficiencies are corrected. The reason for this recommendation is due to City's ability to plan and accomplish improvements on the public side. It will help City partially address l&I as well as provide much needed rehabilitation of the existing collection system by implementing CIPP projects. This will be in line with addressing our needs from the bottom up on the infrastructure side. The monies budgeted for SSES studies will be re-allocated towards performing the actual CIPP work. Staff also recommends enforcing repairs on large private sanitary sewer networks around apartment complexes as well as industrial/retail/commercial buildings. ACTIONS PROPOSED: Provide staff direction on how to move forward with our Sanitary Sewer Program. 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