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HomeMy WebLinkAboutVII. COW Agenda Item Proposed Separate Sanitary Sewer Basin 14 Improvements Mount Prospect Public Works Department INTEROFFICE MEMORANDUM TO: VILLAGE MANAGER MICHAEL E. JANONIS FROM: DEPUTY DIRECTOR OF PUBLIC WORKS DATE: MAY 4, 2009 PROPOSED SEPARATE SANITARY SEWER BASIN 14 IMPROVEMENTS SUBJ: Background The Village-owned wastewater collection system is comprised of over 72 distinct drainage basins. Whether the flow in these basins is combined (storm water and sanitary waste), or separate (only sanitary waste), all of it ultimately flows into the interceptor sewer system owned and operated by the Metropolitan Water Reclamation District of Greater Chicago (MWRDGC). Each basin has a separate connection to the MWRDGC interceptor system. Consequently, the Village has over 72 different MWRDGC connections. Generally, most basins are distinct entities and are not connected to one another. In turn, the MWRDGC interceptor system transports wastewater from these basins for treatment at either the North Side Wastewater Treatment Plant in Skokie, Illinois or the Kirie Wastewater Treatment Plant in Des Plaines, Illinois. The interceptor system that serves Mount Prospect also features drop shaft connections to the Tunnel and Reservoir Plan (TARP). TARP is more commonly known as the "Deep Tunnel". It also includes the large reservoir viewable from the east-bound access ramp for 1~90 on Elmhurst Road. The TARP improvements are intended to provide region-wide relief for flooding associated with severe weather events. From a maintenance perspective, it is useful to,think about the wastewater collection system in terms of basins rather than a single complex system. Typically, defects within a particular basin only impact tributary properties. Conversely, improvements within a basin also usually only benefit properties within the same basin. For these reasons, it makes sense to organize maintenance activities and improvements according to basins. Basin 14 is a single-family residential neighborhood generally bounded by Lincoln Street, We Go Trail, Busse Avenue, and Waverly Avenue. There are no commercial or industrial wastes generated within this basin. Attached for your reference, is a map depicting the area (Attachment 1). This basin serves 171 single-family homes and an estimated population of 442 people. Most of the houses in this neighborhood were constructed between 1955 and 1975. Most of the homes (152) feature gravity sewer systems with direct footing or foundation tile connections. Attachment 2 depicts the homes with direct foundation drain connections. These homes drain to a Village-owned separate sanitary sewer system primarily comprised of 8" diameter vitrified clay pipe that generally flows from the north to south. The 8,400 LF of sewer mains in this basin Page 2 of 8 Proposed Separate Sanitary Sewer Basin 14 Improvements May 4, 2009 connect to the MWRDGC interceptor system in the Lincoln Street right-of-way near 1100 West Lincoln. A map of the wastewater collection system in Basin 14 is included in Attachment 3. Problem Statement Since 2001, staff has received basement back-up complaints from 15 different properties in Basin 14. Of these, 6 were determined to be the result of poor flow in the Village-owned sewer mains. A map of these locations is attached as Attachment 4. The remaining 9 complaints were associated with private property plumbing problems such as root accumulations or pipe failures on sewer service laterals. The 6 complaints attributable to the Village-owned sewer system are notable because they were the consequence of rather nominal wet weather events. Specifically, these basements flooded following relatively light 1"-2" rains. Normally, rainfalls of this intensity do not induce basement flooding. More significantly, crews reacting to these flooding complaints were unable to locate blockages or failures that could have caused the Village sewer mains to surcharge. It appeared the basement flooding was a consequence of too much rain water entering the separate sanitary sewer system. Separate sanitary sewer systems like Basin 14 are designed to convey only sanitary wastewater; not storm-induced clear water. Analysis From 2001 to 2008, staff has performed a number of investigative and repair activities designed to identify and remove potential sources of clear water entry into Basin 14. Joining staff in these efforts were engineers and technicians from Burns and McDonnell. Burns & McDonnell is a full- service engineering consulting firm from Oak Brook, Illinois. Randy Patchett, the project manager for the Basin 14 work, was a principal designer of many successful Mount Prospect sewer improvement projects including the Hatlen Heights Sanitary Sewer Improvements, the Prospect Manor/North Main Sewer Improvements, and the Fairview Garden Sanitary Sewer Improvements. A summary of these efforts is provided below: Sewer Televising All 8,400 LF of sanitary sewer mains in Basin 14 have been inspected and evaluated utilizing closed circuit televising equipment twice. The first effort was initiated in 2001 and revealed a number of potential defects in the Village-owned system that could facilitate the entry of unwanted clear water. These defects prompted sewer main lining, manhole repairs, and pipe replacement projects described in greater detail below. The entire basin was again televised in 2008 and 2009. This second inspection revealed that most of the pipe in the basin was now in good or very good condition. Although some additional sewer lining and spot repair work has been scheduled for the near future, it appears unlikely that significant further reductions in clear water volumes can be gleaned solely from improvements to Village mains. Manhole Inspections All 42 manholes in Basin 14 have been visually inspected for sources of clear water entry. Crews followed a detailed checklist and condition rating system that required entry into the manhole and generated a complete assessment of the structure from the invert of the pipe to the grade of the surface around the manhole cover. This effort identified 18 manholes in need of minor repairs. Page 3 of 8 Proposed Separate Sanitary Sewer Basin 14 Improvements May 4, 2009 Bu#dmglnspecHons All of the homes in Basin 14 have been inspected for improper connections to the separate sanitary sewer system. Improper connections include sump pump discharges, footing or foundation tile connections, downspout connections, area drain connections, and external basement stairwell drain connections. As indicated previously, the majority of homes in Basin 14 have improper footing or foundation tile connections. Although these types of connections were permitted when the homes were originally constructed, they are technically a violation of current MWRGC regulations and Village Code. Burns & McDonnell estimates that the footing tile connections in Basin 14 can discharge over 600,000 gallons of clear water to the separate sanitary sewer system during a nominal rain event. Smoke Testing Smoke testing of sewers is a technique in which non-toxic smoke is blown into temporarily sealed sewer segments to identify leaks or defects capable of facilitating clear water entry that are not readily discernable utilizing cameras or visual observations. If smoke can reach the surface, then unwanted clear water can also reach the sewer main. Smoke testing in Basin 14 revealed 1 defect in a Village sewer main (a segment of pipe with a deteriorated crown), 3 leaking sewer service laterals, 2 leaking service line clean-outs, 1 improper sump pump discharge, and 13 uncovered window well drains. No cross connections between the separate sanitary system and the storm sewer system were identified. The Village main defect was corrected by cured-in-place-pipe lining and the improper sump pump discharge was corrected. The remaining defects were found on private property. None were corrected. Hydraulic Evaluation Burns and McDonnell performed a hydraulic evaluation of Basin 14 during a mild rain event in May 2006. During the 24-hour period preceding the evaluation, the basin received 0.49 inches of rain. During the 1-hour evaluation, the basin received an additional 0.17 inches of rain. Throughout the basin, a dramatic response to the rainfall was noted. In general, the flow in pipes quickly jumped from 1/8 of the pipe diameter at the upstream end of the basin to slightly over % of the pipe diameter near the downstream connection to the MWRDGC interceptor. Burns & McDonnell was able to determine that the observed flow out of this basin equated to 189,000 gallons per day. Previous dry-weather flow monitoring revealed that the bona fide sanitary flow should be 28,000 gallons per day. These calculations suggest that approximately 161,000 gallons (189,000 - 28,000) of clear water had entered the sanitary sewers during this light rain event. Based on this performance, albeit a limited evaluation, Burns & McDonnell estimates that Basin 14 sanitary sewers only provide a 2-year level of protection against sanitary back-ups. In simpler terms, there is a 98% chance in any given year that the basin will receive a rainfall that will cause the sewers to surcharge. Flow Monitoring In 2006 and 2007, flow monitors were placed at various locations inside Basin 14 to measure the volume and rate of flow during both dry and wet weather. The results confirmed previous conclusions that the basin was inundated with an inordinate amount of clear water during rain events. Flows reaching 714 gallons per capita per day were measured following a 1-inch, 24. hour rain event. This rate of flow far exceeds the measured average flow of 323 gallons per Page 4 of 8 Proposed Separate Sanitary Sewer Basin 14 Improvements May 4, 2009 capita per day in most of the Village's other separate sanitary sewer basins. This rate of flow also exceeds the maximum flow rate of 673 gallons per capita per day that the Village is permitted to discharge to the MWRDGC interceptor system. Pursuant to our long term maintenance agreement with the MWRDGC, the Village is obligated to reduce this excessive flow. Rehabilitation Work As previously indicated, initial televising and inspection work in Basin 14 revealed a number defects in the Village-owned facilities that were capable of introducing clear water into the separate sanitary system. Subsequently, staff initiated a series of projects designed to eliminate or correct these defects. A summary of these efforts is provided below. Sewer Lining Approximately 3,100 LF of the 8,400 LF of separate sanitary sewer mains in Basin 14 (37%) have been rehabilitated utilizing the cured-in-place-pipe (CIPP) lining process. A map of lined pipes is depicted in Attachment 5. This trenchless technology essentially inserts and cures a liner inside an existing pipe in a manner that improves structural reliability and permanently seals pipe or joint defects that can facilitate the entry of unwanted clear water. An estimated $60,000 has been spent lining sewer mains in Basin 14 to date. Manhole Repairs All 18 of the manholes identified as containing defects facilitating clear water entry into the sanitary sewer system have been repaired. Generally, this work included replacing open pick- hole covers with solid recessed pick-hole lids, replacing the manhole cover frame, and repairing defective spacer bricks or concrete between the manhole frame and top of the manhole structure. These types of defects were capable of facilitating a relatively minor amount of clear water infiltration during storm events. In addition, 1 concrete block manhole found in poor structural condition was completely replaced with a reinforced precast concrete manhole. An estimated $11,000 has been spent on manhole repairs in Basin 14 to date. Spot Repairs Spot repairs are excavated pipe replacements necessitated when the condition of the pipe prohibits lining with the cured-in-place-pipe system. Collapsed, disconnected, or out-of-round pipes are examples of conditions that would require excavation and replacement. 2 spot repairs were identified in Basin 14. One repair included the replacement of approximately 20 LF of collapsed 8" diameter clay sewer pipe in the rear yard easement behind 1011 Pendleton. This work was completed in 2008. The other project is the replacement of approximately 160 LF of 8" diameter clay sanitary sewer pipe in the We Go Park sewer easement. It is necessary to remove a slight sag in the sewer main. Although this sag does not introduce an appreciable amount of clear water to the sewer system, it does impact the hydraulic gradient of the basin and slows the flow of wastewater. This work is slated for 2009. In total, an estimated $121,000 will be spent on sewer main spot repairs in Basin 14 by the end of 2009. Solutions Relief Sewer Despite these investigatory and rehabilitative efforts, the problem of excessive clear water entry into Basin 14 sanitary sewers remains significant. One potential further improvement to Page 5 of 8 Proposed Separate Sanitary Sewer Basin 14 Improvements May 4, 2009 consider involves increasing the capacity of the existing sanitary sewer system to accept storm water surges. This approach has been utilized successfully in the Village on other projects such as the Maple/Berkshire Sanitary Sewer Improvements and the See Gwun/Milburn Sanitary Improvements. It is also the underlying principle of the famous "Deep Tunnel" project constructed by the MWRDGC. The most common way of increasing the capacity of the existing sanitary sewer system is to construct a relief sewer. A relief sewer is an underground detention system that stores wet weather flows during surcharging conditions. Water detained in the relief sewer would then be discharged by gravity or pumped back into the existing sanitary sewer as surcharging conditions subsided. Historically, the Village has sought a 25-year level of protection when constructing separate sanitary sewer system improvements. A 25-year storm deposits at least 5.51 inches of rain in a 24-hour period. In Basin 14, providing such protection would necessitate the construction of a relief sewer capable of temporarily storing as much as 1 million gallons of water. For your reference, it would take approximately 1,700 feet of 10-foot diameter pipe to store this much water. A possible location for such a relief sewer is under the pavement of We Go Trail and Lincoln Street. Attachment 6 depicts potential siting for this improvement. This depiction illustrates a conceptual installation of 10-foot diameter pipe. Pumping facilities for the detention system would also be required and would include two submersible pumps, a force main, separate power supply, and telemetry connected to the Village's supervisory control and data acquisition (SCADA) system to transmit high water level and power outage alarms. A budgetary cost for installation of an underground detention system as described above is approximately $2,800,000. This cost includes engineering and construction including pumps, force main, power supply, telemetry for the SCADA system, and site restoration. Disconnect Footing Drains and Install Overhead Sewers Due to the significant impact of foundation drains on wet weather flows, the removal of foundation drains is another alternative that could be considered. For your reference, Attachment 7 contains a detailed description of the scope of work involved with footing drain disconnection and overhead sewer installation. This approach holds the promise of permanently removing a significant amount of clear water flow from sanitary sewer system. For Basin 14, 152 foundation drains is the estimated maximum number that would be required to be disconnected. Overhead plumbing would also need to be installed in each residence where foundation drains have been disconnected. At an average cost of $16,000 per residence the total estimated cost to disconnect all the drains is $2,432,000. The elimination of foundation drains would require considerable coordination with homeowners in the basin. Since the number of residences that experience significant flooding is small (- 6 properties), it is expected that far fewer than 152 foundation drains would actually need to be disconnected to mitigate basement flooding problems. If it is assumed that the 6 homes reported to have experienced basement flooding participate and an additional 20 homes elect to Page 6 of 8 Proposed Separate Sanitary Sewer Basin 14 Improvements May 4, 2009 have their foundation drains eliminated, the total cost for implementation of this alternative scales down to an estimated $416,000. However, even if implemented on a reduced scale, the impact on the basin could still be significant. To begin with, the basement flooding problem attributable to the Village sewer system would likely be permanently resolved regardless of the size of a rain event. Additionally, a significant amount of clear water would be permanently removed from sanitary sewer system thereby increasing the capacity of the existing sewers and reducing the potential hazards for neighbors who do not elect to upgrade their sewer services. Each disconnected footing drain removes as much as 4,300 - 5800 gallons per day from the separate sanitary sewer system during rain events. Even if only 26 homes participated in this program, 107,500- 150,800 gallons of clear water would be permanently removed from the sanitary sewer system each rainy day. Recommendations 1. Staff recommends elimination of direct footing or foundation tiles connections and the installation of overhead sewers as the best solution to basement flooding problems in Basin 14. In general, basement flooding and sewer surcharging in Basin 14 is caused by excessive clear water flow from private sector sources. This solution best addresses the crux of the problem. By comparison, construction of a relief sewer only addresses the impact of the problem and does nothing to eliminate or reduce the cause of the problem. More significantly, elimination of foundation drains and the installation of overhead sewers provides virtually complete protection against basement back- ups caused by surcharging sewer mains. By comparison, a detention or relief sewer system as proposed can only provide a designed level protection against a 25Nyear storm event (5.51 inches of rain). If a rain event exceeds this threshold, sewer surcharging and basement back-ups remain possible. Furthermore, elimination of private sector clear water is the only improvement that helps the Village comply with MWRDGC flow rate requirements. As discussed previously (Analysis: Flow Monitoring), Basin 14 exceeds the flow rate (673 gpcpd) established for the Village of Mount Prospect. Construction of a relief sewer or continued public sector sewer main improvements (such as lining all the sewer mains in the basin) would do little to reduce our rate of discharge to the MWRDGC. The removal of footing drains and the elimination of the associated clear water flow would likely have a notable and favorable impact on Basin 14 discharge flow rate. Additionally and perhaps more importantly, the disconnection of footing tiles and installation of overhead sewers is a more cost effective solution in this instance. A detention or relief system is estimated to cost $2,800,000. This estimate does not include on-going annual costs for maintenance and operation. Even if all Page 7 of 8 Proposed Separate Sanitary Sewer Basin 14 Improvements May 4, 2009 eligible homes in the basin upgrade their sewer services, the total cost is estimated to be $2,432,000. However, it is important to emphasize that it is highly unlikely that all 152 homes with direct footing tile connections would need or be inclined to participate in such a program. In fact, significant improvements could be realized if only the 6 homes who have experienced sewer main-induced basement flooding participated ($96,000). 2. Staff also recommends that the cost of this project be shared with private property owners. Private property owners are significant contributors of clear water flow in this basin and those that elect to participate will benefit directly. Many communities, including the Village of Palatine and the Village of Arlington Heights, have opted to implement a cost sharing program with residents for the removal of foundation drains in separate sanitary sewer areas similar to Basin 14. In these programs, the municipality provides partial reimbursement to those residents who elect to have their foundation drains removed and overhead sewers installed. For your reference, Attachment 8 contains a listing of cost- share sewer improvement programs offered by area communities. 3. Staff suggests that the Village implement a program whereby residents are reimbursed for 2/3 of the cost to install overhead sewers and eliminate footing drain connections up to a cap of $12,000 per home. Staff recommends initiating a phase 1 Basin 14 overhead sewer installation and footing drain disconnection program funded to a level of $312,000. This level of funding would facilitate the requisite private sector sewer improvements in 26 homes. As noted previously, the estimated cost to install overhead sewers and eliminate footing drain connections in an average Mount Prospect home is $16,000. Should the Village elect to implement such a program, the potential cost to the Village would range from $72,000 (6 residences) to $312,000 ($26 residences) to $1,824,000 (152 residences) depending on the number of residences electing to have their foundation drains removed. For your consideration, a sample brochure advertising this program is included as Attachment 9. The Finance Department has indicated that the water/sewer enterprise fund currently has sufficient resources to support a limited implementation of such a cost-share program. Staff recommends that if sanctioned, the program should be specifically budgeted and disbursements should be limited to available budgeted funds on an annual basis. 4. Staff recommends strictly limiting this program to single-family homeowner projects that include the installation of overhead sewers and the disconnection of footing drains from the Village-owned separate sanitary Of combined sewer systems. The emphasis of this program should be the permanent elimination of clear water from Village wastewater systems. As discussed previously, the introduction of excess clear water into main sewer systems is a leading cause of surcharged sewers and basement back~ups. Private property sewer improvements such as Page 8 of 8 Proposed Separate Sanitary Sewer Basin 14 Improvements May 4,2009 sewer service line repairs, sewer service tine replacements, c1ean"out installations, or the installation of backwater valves do not help eliminate or reduce the flow of clear water and should not be eligible projects for this cost" share program. Additionally, direct footing drain connections have been prohibited by Village and MWRDGC codes in all new structures constructed since 1970. Private property sewer improvements subsidized by Village funds should seek to increase compliance with these codes. 5. Staff recommends a Village code modification that will specifically prohibit the installation of private property sewer backflow prevention or flood control devices that include by- passing pumping in areas served by separate sanitary or combined sewers. Our work in Basin 14 has clearly identified that clear water from private property is problematic for separate sanitary sewer basins. Plumbing devices that allow property owners to avoid basement back-ups by closing a mechanical valve on their sewer service line and then pump the water originating from their property over the valve into the Village-owned wastewater collection system under pressure only exacerbates surcharging conditions and can induce basement back-up problems for neighboring homes. 6. Staff recommends expanding this cost share program to all singleHfamily homes served by the Village-owned wastewater collection system. Staff recommends initiating a Village-wide overhead sewer and footing drain disconnection program pilot project funded to a level of $72,000. This level of funding would facilitate the overhead sewer installations and footing drain disconnections at 6 homes. The elimination of clear water from sewer systems would be beneficial for all Village-owned wastewater collection basins. There is anecdotal evidence that there may be substantive private sector interest in this type of cost-share program on a Village-wide basis. For many years, the Community Development Department has offered a cost-share program design to offset the costs of private sector flood prevention projects such as the installation of backwater valves. This program reimburses residents for 20% of costs up to a maximum of $1,000 per home. Each year, approximately $5,000 is budgeted for this program. This year, the budget for this program has already been expended. Staff recommends continuing the existing Community Development flood prevention rebate program while adding the proposed overhead sewer and footing drain disconnection program as a separate and disti t offering. Sean P. 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'II I ~,)l.l{r~ 1,--,.....;)1/ ...... · -- m~-;": ~ ~ .. ~~~ ~ Lined Pipes 300 150 0 300 600 Feel I Map info as of 5-6-09 Printed by JJPIPIN BASIN 14 ATTACHMENT 6 ~ ~o I -. ~ I h ~ !1l-t rNl Q \ ~ ~ D ~ ~ Gl. --L. ~ ;: or- I __ ~ ~~ "- -\..-~~ w~dJ~ru\4 ~LJ or- ~ or- ::J or- ,~ r~' n \ I ~5 L-i1![]~OJ~ ... a --r' ~ 8~ .. .... W MILBURN AV .., ~I ~ i UQ] ~1 ~ I ~ I LJ ~~ ~ ( I [3 ~rdJJ ~ I 307 ~ w [;J ~ ;: lI) I ~ LEJ or- or- .)---' co PENDLETON PL 8......~ -Q. ... o ~ [~ ~ <> doal Q '0 L~I or- Q. ........ G? !~ )~1 ~ ~ 'Q ~! G1 w l- ll) < o z < ..I lI) Legend . Potential Pump Station Location . Sanitary Sewer Manhole - Potential Relief Sewer Location ~ Other Size E::ISASIN14 ~ 8" Pipe \ ~ J~ \ r-JJ-.=- .~j, ~ I ~ ~2' c5 c ~ ,,: Q n' ~ ~ 00 0 ~21~ ,: 8 [i] c:] [ Ln6 o~ ~ l W MILBUR~ AV I 21k ' r -' GJg: ~..l l:t: ~ 30~ ~~ ~ ;: DO cg I;: o o 13~ ~Da[][j vv Q. - ~ ,~ - 2~ ~ .... [;b M[ ~ Q,~ b5J W' l 30 L-.J ~ ~ N CD g HL- j;bO. ~ ~ ~q~ / ....... ~ ~~ LI ~ r ClO [ 1 j~.~~~}'[~J[ff?cr~~Cf~ ' --r'-l _P" 0 ....- 1J L!J [!J [j c!J[b.[] d [] ~ ~o ~ u ~ ~ r I I Potential Location of 10-foot Diameter Relief Sewer and Pump Station 150 75 0 150 300 Feet I Map info .. at 5-&09 Primed by JJPtPW BASIN 14 ATTACHMENT 7 What is Footing Drain Disconnection? As shown on Figure 1 below, footing drains are small, pervious drainage pipes (also commonly called "drainage tiles") located near the foundation of your house. They are intended to keep rainwater that seeps through the ground from building up along the foundation or basement walls. In many homes, the downspouts, which carry rainwater from the gutters, discharge near the foundation walls. This water can drain through the soils and into the footing drains. STORMWATER PIPE (lARGER PIPE. CLOSER ~o SURFACE. D1SCHNlGES TO RIVERS. ETC.) ...--~,. -------- ? --"" ...~--_...----- - -------S -_....--- ~SANIT,lRY SE'WER PIPE {SWILLER PIPE, BlRIED DEEPER, REQUIRES TREATMEm) RAIN QR GROUNDWAT~ (NO TREATMENT NEEDED) ENlARGED AREA ---- HOUSEHOLD WASTEWATER (REQUIRES TREATMENT) Figure 1 - Pre-construction Conditions In most homes constructed before the 1980s, the footing drains are connected to the house sanitary connection (house lead) as shown in the figure above. This house lead carries the footing drain flow and wastewater from the house to the sanitary sewer system. When it is not raining this is not normally a problem, but during a severe storm event too much rainwater can enter the sanitary sewer system. This excess flow can cause the mixture of rainwater and wastewater to backup in the house lead of some homes and cause basement backups. Footing drain disconnection is performed to remove the rainwater flows from the sanitary sewer system. This is accomplished using the following steps: 1. Disconnect the footing drains from the house sanitary lead and install a sump pump to move water from the footing drains into the stormwater system. If the connection to the sanitary house lead is inside the basement, the sump is installed in the basement as shown in Figure 2 below. For most homes, the sump discharge will not be connected into the existing storm sewer system but will instead be discharged overland to rain gardens, low areas, etc. INTERNAL FOOTING DRAIN EXTERNAL FooTlNG---- DR.olN i '-INTERNAL FOOTING RAIN OR GROUNDWATER --- HOUSEHOLD WASTEWATER (NO TREATMENT NEEDED) (REQUIRES TREATMENT) ENLARGED AREA ~ SANITARY SEWER PIPE (SMALLER PIPE, BURIED OEEPER, REQUIRES TREATMENT) Figure 2 - Basement Sump Construction ATTACHMENT 8 Community Repair Percentage Maximum Other Arlington Heights Overhead Sewer 50% $2,500 Barrington Overhead Sewer $5,000 Bloomingdale Backwater valve 50% $5,000 Bloomingdale Overhead Sewer 50% $5,000 Champaign Overhead Sewer 75% $5,000 zero-interest loans $500-3,000 Des Plaines Backup Sump Pump 20% $1,000 Des Plaines Backwater valve 20% $1,000 Des Plaines Basement waterproofing 20% $1,000 Des Plaines Lift Station 20% $1,000 Des Plaines Overhead Sewer 20% $1,000 Des Plaines Sump Pump connection to Storn 20% $1,000 DuPage County Overhead Sewer 50% $1,500 Elgin Overhead Sewer 50% $5,000 Elgin Service Lateral 50% $5,000 Elmwood Park Backwater valve 50% $1,500 Elmwood Park Lift Station 50% $1,500 Elmwood Park Overhead Sewer 50% $1,500 Glen Ellyn Backwater valve 50% $2,500 Glen Ellyn Overhead Sewer 50% $2,500 Glencoe Backwater valve 50% $2,000 Glencoe Overhead Sewer 50% $2,000 Huntley Backwater valve $2,500 Huntley Overhead Sewer $2,500 Lisle Overhead Sewer 50% $1,000 Orland Hills Overhead Sewer 50% $2,000 Palatine Backwater valve 50% $750 Palatine Footing Drains 50% $2,500 Palatine Overhead Sewer 50% $5,000 Palatine Repair/lnstall window well drains 10 year loan $1,000-10,000 Palatine Repair/Replace footing drains 10 year loan $1,000-10,000 Palatine Service Lateral 10 year loan $1,000-10,000 Schaumburg Overhead Sewer 50% $5,000 Urbana Overhead Sewer 75% $3,750 Wheaton Backwater valve 50% $2,000 Wheaton Overhead Sewer 50% $2,000 Winfield Overhead Sewer 100% $2,000 . . . . . . . . . . . . . . . . . . . . . ATTACH.MENt 9. · . . . . . . eV\lt ",&Q. c'R.-\A.-p "'& Q. s e V\^. Q. 'Pyob\,eV\^.? we CQ. V\I t-te\'-p \ ......~ ~ ~... ._1 (~~ ~.. ..'(1 ~ . . . . . . . . . . Mount Prospect Overhead Sewer Program Sewage in your basement is a ter- rible experience and one most people would not care to revisit. Unfortunately, basement back- ups have been on the rise in Mount Prospect due to unusually wet weather and the prevalence of older, gravity-style plumbing systems in many homes. Figure 1 on the back depicts a typical gravity style plumbing sys- tem widely utilized during the 1920s - 1970s when much of Mount Prospect was developed. This type of plumbing system is highly susceptible to basement flooding caused by excess water from footing drains or surcharg- ing water from sewer mains. Figure 2 below depicts an over- head sewer plumbing system. Overhead sewers have been in- stalled exclusively on all new con- struction since the mid-1970s. Overhead sewers feature a sump pump that discharges footing drain water to the surface and elevated or overhead sewers in the basement that discharge sani- tary waste to the sewer main. It is almost impossible to experi- ence a basement sanitary back-up in a home plumbed with overhead sewers. Here's The Deal...The Village will contribute 2/3rds of the cost to install overhead sewers and re- move footing drain connections from your sanitary sewer service up to a maximum of $12,000. Only single-family homes served by the Villagenowned sewer sys- tem are eligible for this program. Funding will be limited by avail- able budget. Homes with a verifi- able history of sanitary basement back-ups will have priority. If you would like more informa- tion about this program, visit our website or contact Public Works. SlORt./WATER PIPE (lARGER PIPE, CLOSER ~o SURrA<:[. DISCHHlGES TO flMRS, ETC.) ;"~-1') ~--~~--- ~ --- ~,--~,----- - ---~----;;- --,--'" f\6Jtl OR CROUtlOWA~ (r~0 TREATMENT NEEDED) ~SAl41T1>R'( SE'tIUl PIPE (SMALu:R PIPE, IltJRIED DEEPER. REQUIf'ES TRE"'TMEtlT) - HOUSEHOLD WA'lTEWATER (REOURES TIlEANEtlT) Figure 1: Typical gravity style plumbing system. NEW CHECK VAllIE t-ISTAlLm Itl HOUst:S THAT HAVE HISTORICALLY ROODED ~ SANITARY SE'WER PIPE (SMALlER PIPE. BURIED DEEPER. R[QIJIRES TREATM[NT) f '-INTERNAL rOOTING AAlN OR GROUNDWATER (NO TRfATMENT NEEDED) ---- HOUSEHOLD WASTEWATER (REOUflE:s TREATMENT) Figure 2: Typical overhead style plumbing system..