Stormwater Commission

Stormwater Commission Meeting Summary Tuesday November 1, 2016 Members Present: Fred Kudert, Steven Vinezeano, Joseph LoVerde, Rich Wlodarski, Andrew Vitale, Thomas Powers, Mary Anderson, Robert Callero, Chuck Ostman. Others present: Jeff Wickenkamp, Patrick Lach, and Jeff Macke from Hey & Associates, Jack Grana-Utilities Superintendent, Donna Krause - Resident The Stormwater Commission meeting convened at 8:00 a.m. in the EOC room at Village Hall. June 16th Meeting Summary: The Meeting Summary for the August 12th, 2016 were approved. Old Business: The following topics were presented and discussed. Cleveland Corridor Sewer Improvements Status All of the sewer mains have been installed. Contractor is working on service repairs and restoration. Work is scheduled to be complete this Fall. Flood Control Assistance Program This fiscal year $50,000 was budgeted which would serve twelve home. Ten houses have signed up so far this year which leaves room for two more houses. Community Development is scheduled to visit two more homes which will expend the remainder of the fund for FY17. A list of potential applicants for consideration in future fiscal years will be kept. Backyard Sewer Ownership Status Staff is awaiting a legal opinion regarding ownership and maintenance of the various back yard sewer issues. The opinion of the Commission was reiterated that the Village should not take ownership of or maintenance of the rear yard sewers. Part of the issue relates to the fact that the Village installed many rear yard sewers so there remains a question of whether that obligates the Village to future maintenance. New Business: The following topics were presented and discussed Stormwater Update Presentation – Hey and Associates Hey presented drawing showing four areas of the Village – North, South, East, and West. The maps were based on updated stormwater models which includes recent projects, updated GIS data, and recent private development information. The drawings indicated inundation areas through out the Village. Hey also prepared a table listing problem areas by description. The goal of the meeting is to identify all known areas of flooding and then triage the areas to be studied the further. The next meeting will focus on potential solutions to the identified problems. A short discussion on inundation was held. Hey clarified the provided map and table focuses on surface flooding. The maps provided depth of 100-yr storm flooding. Basement backups were not studied as part of the program due to other ongoing programs which address basement back ups. The map provided also includes Vue work calls for the last 4 years with backyard, basement, and street flooding noted. The map does not include paper copy records, phone calls, or complaints prior to 2012. The Village asked whether older data could be incorporated, Hey recommended using current data with the inundation maps since the maps take into account the Tier 1 projects and many concerns may have been addressed by those projects. West The Carol and Crain (West 1) area was discussed as being downstream of Mary Hill cemetery and a self contained drainage area. This area also included Roseview which according to the maps has the most flooding. The area is low lying area which is flat to the west, the Dempster sewer backs up and floods low lying areas until the downstream sewer has capacity. Residents have reported flood problems since the area was developed. 13 homes are affected by flooding depths of 1-2 feet. Solutions to be evaluated are additional Mary Hill detention expansion, evaluation of the affect of the additional Mary Hill storm sewer installation, and Prairie Farmers Creek improvements. Hey indicated that even with Mary Hill effectively removed from the drainage system the neighborhood still does not have capacity to remove the neighborhood runoff. Village staff noted that the neighborhood appears to be tributary to a 36” RCP to 84” Equivalent Round Size CMP sewer on the North side of Dempster rather than the restricted 15” storm sewer on the south side of Dempster previously shown by our atlases. The maps provided does not take into account the larger outfall indicated by historic IDOT drawings. This area should be restudied based on larger downstream sewer sizes. Village staff asked about the valve located on the outfall to Mary Hill Cemetery and whether it could be opened after storm events. Hey indicated that the valve was obsolete and that the 4” restrictor at Mary Hill was already very restrictive. Even if the valve reduces the flow by 1 cfs, the downstream sewers are seeing a peak flow of 20 cfs so the value in the flow reduction is not significant. The valve could also be causing a drawdown issue and is not benefitting Niles in any meaningful way. Carol and Crain does not see much benefit from the valve. West 2 &3 consists of the area around Our Lady of Ransom. West 2 consists of Park Land and Sunset Rd which has 1-2 feet of flooding with 16 homes potentially affected. Hey felt that the reported flooding did not match the complaints received. The main issue in this area is the lack of capacity in the receiving Park Ridge sewers. No solutions have been identified. It was noted that the Niles side of Western is much higher and does not flood as much as Park Ridge. As discussion continued it was noted that the 16 home affected may include some Park Ridge homes. Cars have been noted to receive damaged at Western. Commission Callero noted that in the past four years Park Ridge installed a sewer draining West out of the parks. The sewer picks up drainage from about the midpoint of the park, and drains west towards Maine East. Hey will investigate the improvements made by Park Ridge. Park Ridge is undergoing a stormwater management plan and has offered to meet with Niles Staff in the Spring to discuss the progress. West 4 consists of Clifton between Greendale and North Terrace. This area has not been previously reported as flooding, however 2 feet of flooding was noted with 9 homes affected. Hey will double check the model for this area. North A resident from Maryland was in attendance which is in area North 6, this area is south of Golf Mill Mall Bounded by Church Street, Cumberland, Maryland, and Ballard. Hey noted that the SW corner of Maryland and Church was a high risk property. 5 Homes are affected and this is one of the areas that would benefit from the Greenwood Basin Project. The area around Chateau Ritz and Maryland should be identified as a sub area. The Commission explained the reprioritization process and the intent is to maximize benefits for the lowest costs. Ms. Krause indicated they installed sewers at 9039 and 9043 Maryland to drain water from Chateau Ritz. A curb was installed impound water on the parking at Chateau Ritz but Joey Drive is still noted a flood problem. The Greenwood Basin concept includes a plan to extend sewer to the Chateau Ritz area. North 1 includes the Golden Forties which suffers from street flooding. A tier 2 project was previously identified to provide detention on the ComEd right-of-way. Glenview would also benefit from a project in that area. Glenview recently installed sewers in the Glendale area which are tributary to Niles. Glenview supports a basin in the ComEd right-of-way but would need to pursue MWRD funding as they have nothing programmed. North 2 is 9402 Western which has been discussed previously for buyout potential. Aqua has recently been purchased by Aqua. Cook County is in the process of studying the area which includes stormwater. North 3 includes Golf Mill. The mall is studying flooding while utilizing a consulting engineer, however communication with the engineer has been unsuccessful due to legal issues. There may be opportunities for coordination with a Greenwood basin project. During large storm events Golf Mill would drain to the future Greenwood Basin via overland flow. North 4 involves flooding at Maryland and Milwaukee. This area would be addressed by the upcoming Greenwood Basin project. Recent information includes discovering that Golf Mill Ford has a sag in the storm line which creates an undrained inverted siphon. Village staff indicated that Golf Mill Ford also drains towards Callero cul-de-sac. A sidewalk project was designed to help with drainage but may not have been installed at the cul-de-sac. North 5 involves the Maryland and Courtland area which could be served by the Greenwood basin Project. North 6 was previously discussed. The Church property has reported flooding as well. North 7 is Churchill project which was initially studied as a Tier 3 as duration project with no stage benefit. To date there has been no resident interaction which would be advisable for project that does not improve stage. The flooding here is caused by limited storage and pump station capacity. The Village asked Hey to investigate the feasibility of increasing the pump capacity. North 8 includes Prospect near Oak Avenue. Hey did not recall previous reports of flooding in the area. Gemini recently installed a detention basin to solve flooding on their property. It was noted that the detention outfall drains to Grace Street and may contribute to residential flooding. Hey noted that this are may warrant further study for solutions. South South 1 includes Nora and Harlem near IGIG Bioswale. Chicago has some improvements planned for the area to the west. Hey has witnessed the flooding coming across Harlem into Niles. A solution for this area is difficult to construct due to the nature of the flood problem which is overland flow coming from an upstream community. A TIF was previously considered for this area, but nothing is currently under consideration. Water flows SE through the neighborhood to the police station and is a historical stream. Since the issue is overland flow, flood storage is not an efficient solution, and the affected properties are likely to be impacted by any storage type solution. Due to volume of water a storage basin on the 7104 Touhy property (South 2) would be unlikely to help the situation. Also, due to the extent of improvements required this area should be considered a low priority. A conveyance solution would require sewer improvements down Harlem to Touhy on to the TARP outfall behind Public works, this option would be quite expensive. East East 1 includes the Crain/Elmore area west of Notre Dame. The first stormwater relief plan (2012 SRP) screened this area as being more expensive than the Cleveland Project. This area is partially protected from Dempster runoff by berms in the curb lines. The drainage system of 18” combined sewer is not sufficient for the neighborhood. IDOT has a drainage project planned for Dempster which extends to Ozark/Notre Dame, but would not serve this area. Village staff inquired as to whether a basin on the school property would benefit this area. Hey indicated that the idea was worth studying and thought this may have been screened during the 2012 SRP since Notre Dame had just recently made drainage improvements. Hey would screen additional solutions and the associated costs. At one time Notre Dame was asking to put their name on Water Tower, at the time it was determined that was not possible. Perhaps there would be an opportunity to revisit the issue and reopen discussions with Notre Dame. East 2 is the Chesterfield area which primarily consists of car flooding with one location of structure flooding. Hey currently doesn’t have detailed modeling of the area. IDOT is making improvements to Dempster and is only concerned with not making flooding in the area worse rather than making improvements. A catch basin was recently installed which has reduced the amount of flooding complaints. East 3 Oriole/ Oleander/ Olcott consists of sag points north of main. The Lee Street sewer was proposed to relieve this area. During Plan development for Tier 2 it was determined that the Lee Street improvement would potentially cause downstream hydraulic grade line (HGL) impacts and basement backups. The downstream properties could be retrofitted with flood control systems, but that would involve complex negotiations with over 40 properties. A question was raised about whether Cleveland sewer could be extended to the neighborhood. Hey indicated that due to the downstream impacts the Lee Street sewer project should remain tabled. A recent legal decision indicated that if a municipality builds a sewer which causes known damage downstream then the municipality would be held liable. The commission decided to table the Main/Lee Sewer option. East 4 is Milwaukee and Kedzie. A Tier 2 project was conceived which addressed duration but not stage. At this time there are not reports of structure flooding. A design involving underground storage was previously prepared. Hey noted that even though the commission has looked less favorably on duration projects, in this case the resident felt duration projects had value. East 5 is the area west of Milwaukee, south of Mary Hill which includes the sag on Wisner. Hey indicated that this area is isolated and difficult to serve. Currently Hey would consider a solution involving big vaults for storage. The commission decided to investigate the situation further with Mike Shields to investigate the area further. Village staff noted that oversized separate sewer was installed on Keeney, which is typical for areas with a drainage problem. East 6 on Ottawa is a similar problem to East 5 where there is a sag point with limited sewer capacity. Commissioner Callero used to own property on Milwaukee near Oakton but never witnessed flooding as indicated. Hey indicated the flooding show was pretty shallow and in the street for smaller storms, so perhaps not as noticeable. Hey inquired if anyone had received complaint from Merrill and Oakton, they did not include it as a specific target area, no one had knowledge of flooding in the area. East 7 is the area south of the Cleveland Project that had a historic Village project involving a restrictor and oversized pipe. Hey is going to investigate whether the restrictor can be removed and/or possibly be rerouted to Cleveland Project. East 8 had a Tier 2 project designed which may be obsolete due to current MWRD requirements. Hey will revisit the area. It was noted that the Village does not have sewer information for Caldwell. Hey noted that the HGL from the Oakton sewer affects this neighborhood as well. East 9 is the Mulford and Oconto area which has been discussed at length at multiple stormwater commission meetings. Hey asked for some feedback on how to develop and screen options. It was discussed that Hey should use their professional judgement to roughly estimate costs and improvement scope. This general specification will help screen out unfeasible alternatives. Hey indicated a solution could be described in some cases rather than fully conceptually designed. This approach could be used to compare and prioritize solutions. Hey indicated it is better to prioritize the solutions rather than the problems. It was noted the area at Dobson and Nordica was not shown as flooding. Village staff noted that this problem area could be tied to the upcoming Howard improvement for a stormwater benefit. The 2012 SRP recommended a Tier 2 project for the area. Another noted location not shown was Jonquil Terrace near Park Ridge. Hey realized that some inundation models were missing from the south east area exhibit. Village staff noted that these areas needed to be shown on the final exhibits and included in the study. One last location raised at previous stormwater commission is near East 5 – Prospect Court which has significant street flooding. There is a sag at the end of the cul-de-sac which Hey previously indicated hadn’t been modeled. This area should be included in the update. Next Meeting Date The date of the next meeting will be determined at the call of the Chairman. The meeting was adjourned at 11:00 a.m.