MWRD Infiltration and Inflow Control Program Compliance Update. Committee of the Whole Meeting April 3, 2018

Transcription

1 MWRD Infiltration and Inflow Control Program Compliance Update Committee of the Whole Meeting April 3, 2018

2 Presentation Outline Background on MWRD s Watershed Management Ordinance Wastewater, Infiltration and Inflow Definitions and Sources Public / Private Sewers Short Term Program Requirements (through March 2020) Long Term Program Requirements (after 2020) Penalties for Non Compliance Proposed Sewer Improvement Program Proposed Sewer Charge Ordinance Amendments

3 Background on MWRD WMO Ordinance Change MWRD adopted new Watershed Management Ordinance (WMO) on July 10, 2014 Article 8 of the WMO References Infiltration/Inflow Control Program Scope and Goals of Article 8 Prevent sanitary sewer overflows and basement backups Help the MWRD comply with their wastewater treatment plant discharge permit conditions Reduce wet weather flows to MWRD wastewater treatment plants

4 Wastewater Definition and Sources Wastewater Used water that is directed to the sanitary sewer system from sources such as: Toilets Sinks Showers and bath tubs Dishwashers Clothes washers Room drains Commercial waste (restaurant wash water, grease, oil, etc.) Industrial waste (manufacturing process waste products)

5 Public and Private Sewers Public Sector Sewer Portion of the sanitary sewer system owned/maintained by a public agency. For Sauk Village, includes all main sewers, manholes, and appurtenances. Also includes the service connection at the main sewer for each lateral sewer. Private Sector Sewer Portion of the sanitary sewer system owned/maintained by private owners. For Sauk Village, includes the service lateral from each building up to the connection with the main sewer.

6 Infiltration/Inflow Definitions and Sources Infiltration and Inflow (I/I) Stormwater or groundwater flow that enters the sanitary sewer system (which should NOT occur). I/I often overloads the capacity of the sanitary sewer system. Inflow is stormwater that enters the sanitary sewer system through downspouts, sump pumps, manholes, and catch basins (above ground) Infiltration is groundwater that enters through defective pipes, manholes, or building connections (below ground)

7 I/I Sources I/I Sources Public Property Defects Storm Sewer Cross Connection Storm Sewer Interconnects Deteriorated Manholes Leaky Sewer Lateral Connection Leaking Manhole Cover Cracked or Broken Pipe Private Property Defects Foundation Drain Cross-Connection Uncapped Cleanout Root Intrusion Broken Sewer Lateral Gutter Downspouts Tied In Sump Pumps 7

8 I/I Sources (continued) I/I Induced Basement Backup 8

9 Work Required by MWRD to be Completed by 2019 Condition assessment to identify high risk areas of system shall be a minimum 10% of the system Undertake rehabilitation work for high risk defects identified or included in a Capital Improvement Plant (CIP) Develop a Long Term Operation and Maintenance Plan (LTOMP) Develop Private Sector Program (PSP)

10 Communities Must Identify High Risk Areas High Risk Areas Are: Areas with sanitary sewer overflows and/or basement backups Areas upstream of sewer overflows and basement backups Sub basins known to surcharge Areas with excessive wet weather flows and/or excessive lift station pumpage Areas with system deficiencies that could result in system failure Specifically for Sauk Village: Two manholes have periodic sanitary sewer overflows Per previous flow metering (2/3 of Village), all areas have excessive wet weather flows

11

12 Condition Assessment Requirements for High Risk Areas In All High Risk Areas Clean and televise all public sewers Inspect all manholes Smoke test all public sewers Dye test sewers in high risk areas where: Smoke testing finds possible cross connections with storm system Sewers cross under areas subject to ponding Downspouts discharge underground

13 Condition Assessment Standardization Uniform inspection standards based on current technology coupled with uniform classification of main sewer, and manhole defects under the NASSCO defect coding system

14 National Association of Sewer Service Companies (NASSCO) Defect Coding Standards Developed a grading system that is universal Sewer Pipeline Assessment & Certification Program (PACP) Manhole Assessment & Certification Program (MACP) Lateral Assessment & Certification Program (LACP) REL has two NASSCO certified employees Rodney Phillippi Martin King

15 Sewer Cleaning & Televising Cleaning removes debris that prevents televising, and contributes to SSOs and BBs Televising identifies defects in the sewers that contribute to SSOs and BBs

16 Sewer Cleaning Performed in preparation for sewer televising inspections Typically performed with a high pressure sewer jet nozzle which removes dirt, debris and grease

17 Sewer Televising Closed Circuit Television Cameras (CCTV) are inserted into sewer lines to record internal pipe conditions CCTV can help identify cracks, voids, root intrusions, breaks, blockages, infiltration and improperly constructed service lateral connections

18 Manhole Inspections Identify structural defects that contribute I/I Provide an inventory of structure types and construction materials used Identify new manholes or buried/missing manholes to update sewer atlases Identify leaking frames, lids, walls, pipe connections manhole depth and location Usually leads to manhole rehabilitation contracts

19 Smoke Testing Is a cost effective method to immediately identify large sewer system defects that contribute significant I/I Defects typically found include downspouts, sump pumps, area drains, leaking mains and services, and cross-connected or directly connected catch basins and storm sewers

20 Dyed Water Flooding Manhole Leak Helps to pinpoint and quantify locations of large I/I sources Is typically done in conjunction with CCTV and as a follow up to smoke testing or building inspections Sump Pump Failure

21 High Priority Deficiencies Mainline Sewer Must be addressed within three years of identification NASSCO Grade 4 and 5 defects Multiple/hinged fractures, soil visible, heavy roots, large offset in a joint, etc. Manholes Must be addressed within three years of identification NASSCO Grade 4 and 5 defects Poorly fitting lid, open pick hole, hole in the manhole walls, etc. Cross Connections Must be addressed within one year of identification Direct storm to sanitary connections High flow indirect connections Private Sector, Low Cost High Priority Deficiencies - Must be addressed within one year of identification Downspouts, missing cleanout caps and defective cleanout caps

22 High Risk Area Investigation Results and Recommendations Sewer Cleaning and Televising 17,277 feet of sanitary sewer cleaned and televised (8-12 diameter) 8,200 feet of sanitary sewer classified as Grade 4 or 5 defects on the NASSCO scale (49% of sewers needs to be repaired) Most cost-effective repair technique is cured-in-place pipelining (CIPP) No excavations required New liner creates a pipe within a pipe >50 year design life Free of joints and cracks that could leak Improves sewer flows Eliminates sources of I/I Halts the intrusion of roots into the piping Project Cost for CIPP in High Risk Area - $319,000

23 High Risk Area Investigation Results and Recommendations, continued Manhole Inspections 75 manholes inspected 108 defects classified as Grade 4 or 5 defects on the NASSCO scale in 61manholes (81% of manholes need to be repaired) Variety of repair techniques Clean manhole to remove debris Grout and seal manhole walls Replace or seal frame and cover Project Cost for Manhole Repairs in High Risk Area - $191,000

24 High Risk Area Investigation Results and Recommendations, continued Smoke Testing 17,277 feet of smoke testing Defects were found in 53 of the 76 pipe segments (70% of total pipe segments tested) Ownership Private - 42 cleanouts, laterals, and private manholes Village - 51 manholes and cross-connections with catch basins Repairs Private To be addressed in the Village s Private Sector Plan (PSP) Village - Project Cost included in cost for manhole repairs

25 High Risk Area Investigation Results and Recommendations, continued External Property Inspections Purpose - Identify potential cross-connections where storm water can enter sanitary sewer system 383 properties inspected 240 potential cross-connections identified Driveway and area drains Window wells and downspouts that drain into the ground Approximately 195 properties will require additional follow-up inspection Further investigations for potential cross-connections will be addressed in the Village s Private Sector Plan (PSP)

26 MWRD Annual Reporting Year Submittals Due to MWRD (Due March 1 st of each year) Short Term Requirement Annual Summary Report (High Risk Area investigation, and progress towards long-term goals) Status of High Priority Defects Form Updated sewer map showing the locations of the condition assessment activities performed in the previous year

27 MWRD Annual Reporting Year 2020 and After Submittals Due to MWRD (Due in March of each year) Long Term O&M Program and Summary Report Status of High Priority Deficiencies Form CIP showing when high priority deficiencies will be addressed List of property addresses where private sector sources have been identified but not corrected Schedule for correcting private sector I/I sources

28 MWRD Penalties Penalties Loss of eligibility for funding assistance by MWRD (NONE currently) Reporting of non compliance to IEPA/USEPA Denial of Watershed Management Permit for Qualified Sewer Construction

29 MWRD Inspection Requirements Continue inspection work beyond High Risk Area 10% of system per year recommended 2% of system per year minimum Proposed inspection program 2019 Inspect manholes (50% of system) 2020 Smoke test sewers (25% of system) 2021 Clean and televise sewers (10% of system) 2022 Clean and televise sewers (15% of system) Annual Inspection Cost - $60,000 +/-

30 Proposed Sewer Improvement Program Inspection work will lead to sewer system repair recommendations Sauk Village cannot afford to do all work at once (typical for all municipalities) Break the work into more affordable components = Capital Improvement Plan (CIP) Recommend 5-Year Plan

31 Proposed Sewer Improvement Program, continued After 5 years of sewer system inspections, compile list of recommended repairs Based on High Risk Area defect rate and preliminary repair project cost estimates: Repair 25% of Village s sewers and 50% of Village s manholes Total project cost - $1,800,000 Apply for an IEPA low-interest loan (similar to Water Treatment Plant Improvement project) Per current loan terms offered, Sauk Village would be eligible for discounted interest rate (1.33%) and $500,000 loan forgiveness Annual payment to IEPA - $72,000 (20 years)

32 Additional Program Costs FY 2019 TBD Program development: Long Term O&M Program Private Sector Program Compliance management FY 2020 & Beyond Costs TBD Implementation of Long Term O&M Program, including Capital Improvement Plan Implementation of Private Sector Program Compliance management

33 Proposed Sewer Charge Ordinance Amendments Sewer Charge Ordinance needs to be amended Fund inspection and repair costs mandated by MWRD Account for inflationary cost increases to fund sewer system operational costs Sewer charges have not increased since 2010 Components: User Charge Monthly Maintenance Charge Monthly Surcharge

34 Proposed Sewer Charge Ordinance Amendments, continued User Charge Charge per 1,000 gallons of water used Current rate - $0.99/1,000 gallons Proposed rate - $1.25/1,000 gallons $0.05/1,000 gallons increase per year through 2023 to account for inflation Monthly Maintenance Charge Per current ordinance named as Debt Service Fee Change name to Monthly Maintenance Charge for operational expenses Current rate - $15.50/month Proposed rate - $16.25/month $0.25 increase per year through 2023 to account for inflation Mobile home parks will be charged per lot (rather than per subdivision) Projected to generate additional $104,000/year to fund sewer system operations

35 Proposed Sewer Charge Ordinance Amendments, continued Monthly Surcharge New charge to fund sewer system work Proposed rate - $1.50/month $0.25 increase per year through 2023 to account for inflation Projected to generate $60,000/year to fund mandatory MWRD inspection work and future debt service on IEPA loan

36 Summary MWRD s I/I Control Program is an unfunded mandate additional costs Opportunity to increase diligence in sanitary sewer maintenance Will result in an improved sanitary sewer system with fewer problems Will reduce incidences of SSOs and BBs Will insure sanitary sewer system capacity during wet weather events

37 uestions