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HomeMy WebLinkAbout3. 2011 Comprehensive Stormwater Study Final ReportMount Prospect C X / Mount Prospect Public Works Department INTEROFFICE MEMORANDUM TO: VILLAGE MANAGER MICHAEL E. JANONIS FROM: DIRECTOR OF PUBLIC WORKS DATE: MARCH 5, 2012 SUBJ: 2011 COMPREHENSIVE STORMWATER STUDY FINAL REPORT Background This memorandum transmits a copy of the 2011 Comprehensive Stormwater Study final report as prepared by the Village's engineering consultant, Burns & McDonnell of Oak Brook, Illinois in conjunction with Village staff. This report culminates five (5) months of data collection, and analysis pertaining to the extensive flooding that beset the Village following torrential rain on July 23, 2011. The report also presents a series of recommendations intended to cost - effectively mitigate defined and recurrent flooding problems. At over 100 pages, the attached report is an expansive and compendious examination of the subject. However, the essence of the report can be distilled to the following central themes: The July 23, 2011 rainstorm was an extraordinary event. Analysis of official National Weather Service data indicates that rainfall received in the early morning hours on that day was the most intense ever recorded in the Chicago area. Technically, the storm is considered a "400 + - year" event; a storm that has a 0.25% statistical probability of occurring in any given year. Although technically feasible, constructing sewer improvements to convey a 400 -year storm is cost prohibitive. Conservative estimates place the financial cost of such a feat in excess of $200 million. Furthermore, even if the local sewer systems could collect and convey the storm, downstream conduits such as the Metropolitan Water Reclamation District of Greater Chicago ( MWRDGC) interceptor sewers, MWRDGC "Deep Tunnel" system, and local waterways do not have the capacity to accept the discharge. Consequently, substantial additional expenditures would be required to procure property and construct detention facilities to temporarily store the excess volume. Rainfall- induced flooding is not a new, or even recent, development in the Chicago area. The entire region has been plagued with flooding problems dating all the way back to initial settlements. In Mount Prospect, flooding issues predate incorporation of the Village and highlight each of the intervening decades until this day. Locally, tens of millions have been spent in efforts to mitigate the problem. Regionally, billions have been expended on projects such as the "Deep Tunnel ". Inevitably, all of these improvements have been rendered ineffective by storms that exceed their designs. The common thread uniting all of these efforts has been the unequivocal pursuit of a "build a bigger pipe" solution. That is, all of these Page 2 of 3 Transmittal of Comprehensive Stormwater Study Final Report March 5, 2012 improvements have featured the construction of larger pipes, or the installation of relief sewers and pumping stations, designed to handle the last big storm. Burns and McDonnell recommends, and staff concurs, that the most effective and cost - efficient go- forward stormwater management s trategy involves a combination of private sector and public sector improvements: ➢ Recommended private sector improvements include the disconnection of footing tile drains and the installation of overhead sewers in the 379 homes that reported sanitary backup. These improvements will eliminate the prevalent pathway for sanitary sewer water to enter basements and below -grade living spaces — the gravity drain. In many cases, these improvements will also eliminate the introduction of clear water into separate sanitary sewers. The estimated cost of this work is $9,475,000. ➢ Recommended public sector improvements include the installation of larger pipes, and /or the construction of relief sewers, at specified locations. These improvements will be constructed where engineering evaluation revealed severe and geographically concentrated flooding associated with a pronounced lack of local sewer conveyance capacity. Improvements will be designed to provide a 25 -year level of protection. The estimated cost of this work is $14,440,000. ➢ Four (4) drainage basins were identified that warrant additional engineering evaluation. The estimated cost for this work is $28,000. The total cost for all improvements recommended by the attached 2011 Comprehensive Stormwater Study is $23,943,000. Discussion Staff seeks Village Board direction on the following items: Is there support for Village participation in the cost of footing tile disconnection and overhead sewer installation on private property? a. If there is support, at what level? i. Should the Basin 14 model be applied? (50% grant, 50% simple- interest loan payable upon sale of the home, $18,000 cap per home.) ii. If the Basin 14 model is inadequate, how should the Village participate in the cost of private sector improvements? 2. Several property owners affected by the July 23, 2011 flood have subsequently installed overhead sewers and removed footing tile connections. Should these property owners be retroactively eligible to access Village financial aid? 3. Is there support for the construction of recommended public sector improvements? Page 3 of 3 Transmittal of Comprehensive Stormwater Study Final Report March 5, 2012 4. It is the opinion of staff that sufficient capacity does not presently exist in the water /sewer enterprise fund to facilitate recommended repairs. As such, serious consideration of this report and its findings inevitably will broach the issue of financing options. To this end, staff suggests that the following alternatives might be worthy of deliberation: Increase water /sewer rates The current water /sewer rate structure provides little capacity to address long -term capital improvements. Historically, our water /sewer rates have demonstrated the capability to fund only operational costs and satisfy Northwest Suburban Municipal Joint Action Water Agency (NWSMJAWA) commitments. However, recent rate increases by the City of Chicago, our water supplier, has severely curtailed the potential for funding improvements with user fees. Extend or Increase Sewer Maintenance Flat Fee. The existing flat fee applied to water /sewer bills to finance the sewer improvements is set to expire in 2016. This fee typically generates approximately $800,000 per year. The sunset on this fee could be extended and /or the fee could be increased to fund recommended improvements. Utilize available capacity on the quarter -cent sale tax. In the past, a number of flood relief and sewer improvement projects have been funded utilizing this mechanism. However, much of the revenue generated from this tax is currently being utilized to service existing debt. The Finance Department forecasts that capacity will start to become available from this revenue source in 2013. Typically, it generates $1.2 million per year. At the present time, approximately half of the revenue is applied to retire debt incurred to fund sewer improvements implemented following the 1990 flood study. The other half is utilized to fund flood control capital projects. We will continue to retire debt until 2019 when all loans will be repaid. Create a special service area The entire Village could be defined as a special service area. This classification would enable access to the property tax levy for the purpose of funding stormwater improvements. This solution has the potential to be an acceptable long -term solution if it can be structured to replace Special Service Area 5. Special Service Area 5 is due to expire in 2017. It was originally implemented to pay for the costs of bringing Lake Michigan water to the Village. Recommendation With your concurrence, staff asks that this matter be presented for the Village Board's consideration at the April 10, 2012 Committee of the Whole meeting. Sean P. Dorsey EXECUTIVE SUMMARY The Village of Mount Prospect (Village) contracted Burns & McDonnell Engineering Company, Inc. (Burns & McDonnell) to determine the reasons for the significant impacts to the Village that occurred with the July 23, 2011 storm event and identify potential improvements to the Village's stormwater management system that would help to diminish the impact that a future storm of this magnitude would generate. The Village provided storm flood survey information to Burns & McDonnell which was gathered from the residents through an extensive public outreach program. This outreach program included having Village employees and Burns & McDonnell representatives visiting residents' homes or contacting them via telephone to gather information regarding the magnitude and type of flooding experienced by each affected resident. Further, the intent of the study was to quantify and analyze the various drainage basins within the Village based on the findings of the flood surveys. Using the information gathered, areas that experienced the highest density of flooding were selected to be studied in greater detail using hydraulic modeling software. Basins that were not modeled were analyzed based on the types of flooding reported in each area. This study is intended to serve as a tool to assist the Village in evaluating and prioritizing capital improvements and in maintaining its storm and combined sewer system, as well as its separate sanitary sewer system. It is important to emphasize that the July 23 storm was an extreme rain event in terms of rainfall intensity and quantity. According to the hourly rainfall data obtained from the rain gauge at Chicago O'Hare International Airport, a total of 6.78 inches of rain fell during the peak 3 hours of the storm. Over a 24 hour period, a total of 8.27 inches of rain fell over the area. The storm can be classified as approximately a 400 -year storm (or a storm that has a probability of occurring once every 400 years) based on the 3 -hour peak intensity and volume of rainfall. Current industry standard is to design a typical storm sewer system to handle a 10 -year storm event using Bulletin 70 Rainfall Data. Much of the Mount Prospect storm and wastewater collection system was constructed prior to when these standards were implemented, and as such, may have a lower conveyance capacity. This circumstance is typical for older communities including the City of Chicago and most "inner ring" suburbs. Therefore, flooding of the local conveyance system during a storm with a magnitude like that of the July 23 2011 storm is unavoidable. A low end conservative estimate of the capital cost to mitigate the flooding from an event similar to the July 23 storm using public sector improvements only is in excess of $200,000,000. This cost would include the construction of relief storm sewers, combined relief sewers, underground detention, sanitary relief stations and other related improvements. Purchasing property to create additional detention would increase these costs further. Additional operation and maintenance costs would also be incurred by the Village. Even with all these improvements, protection against sewer backups from a storm event similar to the July 23 2011 event would not be as reliable as private property improvements such as installing overhead plumbing or backup prevention systems. The Village performs a very thorough maintenance and flood relief effort on an ongoing basis. Inspections of the stormwater system outfalls at detention basins and creeks are made on a twice a year Village of Mount Prospect ES - 1 February 2012 Stormwater Management Study basis. In addition each of the Village's wastewater collection system basins is inspected and maintained on a regular and systemic basis. Further, since 1990, the Village has spent over $25,000,000 in flood relief improvements, and has significantly reduced infiltration and inflow of stormwater runoff to its separate sanitary sewer system. These efforts have provided a significant benefit to the Village; greatly reducing the frequency and magnitude of flooding incidents. Nevertheless, sanitary backups and surface flooding occurred in many of the areas where improvements have been made simply due to the magnitude of the July 23 2011 storm event. While there are areas where frequent surface flooding can be diminished by upgrading the public conveyance systems, the most effective solution to minimize sanitary backup is to make private sector improvements. Making strictly public sector improvements is cost prohibitive, and there are likely structural integrity and capacity issues in private sector piping that would still remain problematic even if the public sector sewer main could accept all of the water. Further, the MWRDGC receiving system has a limited capacity. Increasing the capacity of the Village's sewers may be rendered ineffective by restrictions caused by the MWRDGC receiving system. It is important to note that neither public nor private sector improvements will alleviate all flooding should an event similar to the July 23` rainfall occur. Private sector improvements that can be made to mitigate flooding impacts include the following: • Disconnection of foundation drains and installation of overhead plumbing in 379 buildings /homes that reported sanitary backup. • Inspection and repair of foundation walls through which seepage occurred in 177 buildings /homes. • For the 203 properties that experienced surface flooding during the July 23 storm event, inspection of property drainage including all gutters, downspouts and locations of sump pump discharge to make sure that surface drainage is directed away from the residence. This may also help minimize seepage. • For the 142 properties where sump pump failure was experienced inspection of the sump pump system to make sure that it is working and has adequate capacity. After completion of the inspection install a secondary sump pump, if needed, and a battery backup and /or emergency generator if system. The budgetary cost for the disconnection of foundation drains and the installation of overhead plumbing in 379 buildings /homes is $9,475,000, based on an average cost of $25,000 per building /home. Development of costs for mitigating flooding resulting from sump pump failures through the installation of a secondary sump pump and an emergency battery backup and /or emergency generator for the 142 buildings /homes that reported sump pump was not determined as part of this study. It is recommended that each property owner contact a company that specializes in providing sump pump inspections and emergency generator installation to mitigate sump pump failures. Village of Mount Prospect ES - 2 February 2012 Stormwater Management Study Cost for mitigating flooding from seepage and private sector surface flooding in these basins was not determined as part of this study. It is recommended that each property owner contact a company that specializes in mitigating basement flooding caused by seepage. Based on the results of the flooding questionnaires, additional assessment and hydraulic modeling was performed for several areas where the most severe and geographically concentrated amount of flooding occurred. Based on this additional assessment improvements to upgrade the capacity of the existing combined and separate sewer systems were developed. Budgetary costs for implementing these public sector improvements are $14,440,000. Several separate sewer areas were also identified for additional assessment. These areas have a relatively low occurrence of reported flooding; however several localized areas of concentrated flooding were reported. A budgetary cost for completing the recommended evaluations is $28,000. Cost Summary The total budgetary cost to implement the recommendations presented in this study is $23,943,000. A breakdown of these costs is presented in the following table. Qiimmary of Reenmmended Stormwater ManaLyement Improvements Village of Mount Prospect ES-3 f ebruary zuIz Stormwater Management Study Budgetary Area Type of Improvement Improvement Cost Haden Heights Public Sector Storm Sewer Improvements for 25- $1,500,000 Subdivision Y ear Level of Service Hatlen Heights Sector Sanitary Sewer Improvements for $105,000 ' Subdivision 25- ear Level of Service 25-y ear Combined Sewer Improvements for $12,500,000 Isabella Street Area Public Sector 25 -year Level of Service CS31 Combined Sewer Lonnquist Boulevard Public Sector Improvements for 25 -year Level of $200,000 Area Service Lonnquist Boulevard Public Sector Adding Inlets and Televising $135,000 Area Village -wide Private Sector Disconnection of 379 Foundation Drains with Overhead Plumbing $9,475,000 Further Investigation Basin SS21, Basin SS41, Basin $28,000 and Additional SS45 and Illinois American Basin Analysis Total $23,943,000 Village of Mount Prospect ES-3 f ebruary zuIz Stormwater Management Study Village of Mount Prospect Mount Prospect, Illinois INTEROFFICE MEMORANDUM TO: MICHAEL E. JANONIS, VILLAGE MANAGER FROM: FINANCE DIRECTOR DATE: MAY 17, 2012 SUBJECT: STORMWATER MANAGEMENT IMPROVEMENT PROJECT FINANCING The final report of the 2011 Comprehensive Stormwater Study was presented to the Village Board at the April 10, 2012 Committee of the Whole meeting. Included with the report were several recommendations for dealing with the recurring flood problems. Solutions presented for consideration include $9.5 million in private sector improvements and $14.5 million in public sector improvements. Exhibit A included with this memo highlights the various project costs and associated debt service requirements while Exhibit B is an available funds analysis of the Flood Control Fund. The total cost to implement the recommendations presented in the study is estimated at $23,943,000. A breakdown of projects is listed below. Storm Related Projects $ 17,225,000 Sanitary Related Projects 6,250,000 Other Projects 468,000 Total $ 23,943,000 If general obligation debt were issued to pay for most project costs, the annual debt service requirement for storm related projects would be $1,184,716. The annual debt service requirement for sanitary related projects, paid from the Water & Sewer Fund, would be $429,868. Other projects identified in the study totaling $468,000 are assumed to be paid through current revenues of the Flood Control and Water & Sewer Funds. This available funds analysis ascertains to what extent the Flood Control Fund can support new debt while continuing to pay for ongoing flood control maintenance and debt service on the remaining low interest loans issued by the IEPA. There are currently five (5) IEPA loans outstanding that will be paid off between 2013 and 2019. Each of these loans was originally issued between January 1994 and December 1999. The analysis shows that after accounting for new debt service requirements, there is a projected deficit in available funds beginning in 2013. The shortfall in that year is $753,000. The shortfall gradually decreases each year through 2019 as IEPA loans are paid off. The first projected surplus occurs in 2020. A more detailed review of the exhibits will be provided at the May 22, 2012 Committee of the Whole meeting. Staff will be on hand to answer questions and facilitate discussion. David O. 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N U s C 0 U QJ N I I I E = > VI 0 0 G L 0 41 ++ 0. o o o= C o sa 3 E E 0 a N ar 0 O i f c U • s z c c z t c • c S c i a 0 pnd N S U a) " O L CL O z3 C o LL ) U - J W O O L 3 O a) U a) N O co Z � L do a) ) � L LL O N L a) 7 C _ a) > > co a) ' L L CV 3 L }J U f6 3 a) E O a) � z3 t0 � (6 Q � L C N z3 an � L W VI Village of Mount Prospect Mount Prospect, Illinois INTEROFFICE MEMORANDUM TO: MICHAEL E. JANONIS, VILLAGE MANAGER FROM: FINANCE DIRECTOR DATE: APRIL 19, 2012 SUBJECT: SIGNIFICANT ISSUES Listed below are a number of items that are expected to have a significant impact on the overall financial picture for the Village. While many of these items have their own dedicated revenue source, the revenue is not sufficient to support the programs fully moving forward. Decisions on one particular item will have a direct impact to how others can be addressed. 1) Street Resurfacing Program To prevent streets from deteriorating to the point where a complete reconstruction is required, an annual resurfacing program has been put in place. Resurfacing of village streets included in the program is done according to a 20 -year life cycle. To meet this desired goal, 6.8 miles of streets are to be resurfaced each year. Based on the 2012 cost of $100 per linear foot, the annual funding requirement is $3.6 million. Due to shortfalls in the MFT and Street Construction Funds the amount of streets resurfaced were reduced. In 2010 only 5.0 miles of streets were resurfaced while in 2011 only 4.9 miles were resurfaced. For 2012 only 4.7 miles of streets will be resurfaced. There is currently a backlog of approximately one year's worth of resurfacing at an estimated cost of $4.0 million. Shortfalls in the MFT and Street Funds continue with funding available to support just two- thirds of what is required annually. Currently, funding for the street resurfacing program is derived from the state and local motor fuel taxes and a one - quarter percent home rule sales tax. 2) Flood Control Program Similar to the street resurfacing program, the flood control program was put in place to deal with a backlog of flood projects and to address flood control moving forward. Debt was issued in 1994, 1997 and 1999 to support the initial stages of the flood program. The debt is beginning to be paid off making funds available to support ongoing flood projects. Funding comes from a one - quarter percent home rule sales tax. As a result of the extensive flooding that occurred in the village in July 2011, a comprehensive stormwater study was conducted by Burns & McDonnell. The study presented a series of recommendations to cost - effectively mitigate flooding problems. Recommendations made by Burns & Mc Donnell are for projects outside of existing flood control efforts and includes a strategy that involves both private and public sector improvements. Private sector projects consist of the installation of overhead sewers estimated to cost $9.5 million. Public sector improvements to the village -wide stormwater system are estimated to cost $14.4 million. 3) Emerald Ash Borer Infestation (EAB) The Village began actively preparing for EAB in 2003. Various programs have been put in place to proactively address the pending infestation. It is now apparent that further, more aggressive steps are needed to address the expected loss of ash trees throughout the village. Costs Significant Issues May 18, 2012 Page 2 associated with the removal and replacement of the 4,400 ash trees is expected to cost between $2 million and $3 million. This figure does not include the cost of providing insecticidal treatment for healthy trees. A funding source for addressing EAB has not been identified. 4) Randhurst Redevelopment Agreement In 2009, the Village entered into a redevelopment agreement (RDA) with the owners of Randhurst Mall. The agreement requires the Village to contribute $25 million, in the form of an interest bearing Note, to cover certain costs associated with the redevelopment. Support for the $25 million commitment is to come from various revenue sources generated on the redevelopment site. These revenues include sales and amusement taxes, food & beverage taxes, a hotel /motel tax and a business district tax. Semi - annual payments from these revenues are to begin upon issuance of Certificate of Completion #2. When steady revenue streams have been established the Village will be asked to retire the Note through the issuance of Business District Bonds and /or Revenue Bonds. 5) Automatic Meter Reading System An automatic meter reading system (AMR) is planned for both commercial and residential water customers. An AMR system improves the efficiency of the water system by providing real time reads and eliminates the need to visit the physical meter location for routine functions such as final reads. The Village is in the process of selecting a vendor for the installation of automatic meter reading equipment on all commercial accounts. Approximately 1,200 meters will be receiving this new equipment in this first phase at a cost of $565,000. Funds to pay for this first phase are included in the 2012 Water Fund budget. The second phase of AMR involves approximately 12,000 residential customers. The AMR changeover is planned to occur over a four -year period beginning in 2012. The 2012 Water Fund budget included $400,000 towards the initial stage of the project. There is $1 million in each of the following 3 years to complete the residential AMR project. Although the funding source is through the Water Fund, shortfalls in the budget may necessitate this project being deferred. The challenges presented in addressing these above listed items are in addition to those we continue to experience in managing the day -to -day operations of the Village. There still exists in the General Fund a structural imbalance in the growth of revenues versus expenditures and rate increases imposed by the City of Chicago on the cost of water has reduced the amount of funds available for maintaining the Village's water and sewer system. My presentation at the workshop will facilitate discussion on this item. Let me know if you would like to discuss this further. David O. Erb Finance Director CADocuments and Settings \djarosz \Local Settings \Temporary Internet Files\Content.Outlook\W7C5BMPD \Significant Issues Memo.docx