===== PDF PAGE 84 ===== [Extraction: embedded PDF text] CITY OF WEST CHICAGO INFRASTRUCTURE COMMITTEE AGENDA ITEM SUMMARY ITEM TITLE: AGENDA ITEM NUMBER: _q-_· ~· -~-·-- Resolution No. 24-R-0023 - 2024 Local Limits Study COMMITTEE AGENDA DATE: March 7, 2024Evaluation Report COUNCIL AGENDA DATE: March 18, 2024 STAFF REVIEW: Mehul T. Patel, P.E., Director of Public Works SIGNATURE _________ _ APPROVED BY CITY ADMINISTRATOR: Michael L. Guttman SIGNATURE._________ _ ITEM SUMMARY: Regulated by permit issued by the Illinois Environmental Protection Agency (IEPA), the West Chicago/ Winfield Wastewater Authority's (WCWWA) Regional Wastewater Treatment Plant accepts and treats all sanitary waste discharged from residential and non-residential properties within the City of West Chicago and Village of Winfield. Non-residential waste is regulated by the Municipality's Sewer Use Ordinance (i.e., Chapter 18 of the City of West Chicago Code of Ordinances), which identifies pollutant limitations and parameters (referred to as local limits) of the waste discharge. On April 19, 2022, the IEPA Division of Water Pollution Control reissued, to the City, NPDES Permit No. IL0023469 authorizing the WCWWA's Regional Wastewater Treatment Plant to discharge to the West Branch of the DuPage River in accordance with the Effluent Limitations, Monitoring, and Reporting requirements; Special Conditions and Attachment H Standard Conditions of said permit. Special Condition 11.A.3 of reissued NPDES Permit No. IL0023469 requires the WCWWA to conduct a technical re-evaluation of its local limitations consistent with U.S. EPA's Local Limits Development Guidance 9 (July 2004) and submit the evaluation and any proposed revisions to the WCWWA's local limits to the IEPA and U.S. EPA Region 5 for review and approval. The technical re-evaluation report must be submitted to the IEPA and U.S. EPA Region 5 by April 19, 2024. Baxter & Woodman, Inc. of Crystal Lake, Illinois conducted a technical re-evaluation of the WCWWA's local limitation, to prepare an evaluation report, and to identify suggested/proposed revisions to the City's local limits. Attached for your review and consideration is a copy of the Local Limits Evaluation Report completed by Baxter & Woodman, Inc., dated February 2024. Table 1 on Page 7 of said report identifies Baxter & Woodman's recommendation for changes to the WCWWA's local limitations for regulated pollutants of concern. There is only one change recommended in current limits which is decreasing the current Nickel local limit from 0.9 mg/I to 0.6 mg/I. The City Council needs to pass a resolution to submit the draft 2024 Local Limits Study Evaluation Report to the USEPA and IEPA for review and comment. Once the report is finalized the City Council will need to adopt an ordinance accepting the new local limits. ACTIONS PROPOSED: Approve Resolution No. 24-R-0023 authorizing the Mayor to accept the local limit change recommendations identified in the 2024 Local Limits Evaluation Report and authorize staff to submit said report to the IEPA and U.S. EPA Region 5 for review and approval. COMMITTEE RECOMMENDATION: ===== PDF PAGE 85 ===== [Extraction: embedded PDF text] RESOLUTION NO. 24-R-0023 A RESOLUTION GRANTING AUTHORITY TO SUBMIT THE LOCAL LIMITS EVALUATION TO THE USEPA WHEREAS, the City of West Chicago, as the Designated Operating Agency of the Wastewater Treatment Plant owned by the West Chicago/Winfield Wastewater Authority (WC WWA), requisitioned preparation of a 2023 Local Limits Evaluation by the engineering firm of Baxter & Woodman Consulting Engineers; and, WHEREAS, in cooperation with the City of West Chicago and Village of Winfield, Baxter & Woodman Consulting Engineers prepared that certain West Chicago/Winfield Wastewater Authority, 2023 Local Limits Evaluation, dated February of2024 (the "Local Limits Evaluation"); and, WHEREAS, the United States Environmental Protection Agency ("USEP A") requires that the City Council of City of West Chicago authorize submittal of the Local Limits Evaluation to the USEP A for approval; and, WHEREAS, publicly owned treatment works ("POTWs") that have approved pretreatment programs must continue to develop and revise local limits as necessary [40 CFR 403.S(c)(l)]; and WHEREAS, USEPA regulations require that POTWs with approved pretreatment programs must "provide a written technical evaluation of the need to revise local limits under 40 CFR 403.S(c)(l), following permit issuance and reissuance" [40 CFR 122.44G)(2)(ii)], and WHEREAS, the City Council of City of West Chicago has had an opportunity to review and evaluate the Local Limits Evaluation. NOW, THEREFORE, BE IT HEREBY RESOLVED by the by the City Council of the City of West Chicago, in regular session assembled that staff is hereby authorized to submit the Local Limits Evaluation to the USEP A. APPROVED this 18th day of March 2024. AYES: NAYES: ABSTAIN: ABSENT: Ruben Pineda, Mayor ATTEST: Valeria Perez, Executive Office Manager ===== PDF PAGE 86 ===== [Extraction: embedded PDF text] 1 EXECU Page6 1. EXECUTIVE SUMMARY This report summarizes the West Chicago/Winfield Wastewater Authority's (Authority) local limits evaluation for .its West Chicago Regional Wastewater Treatment Plant (WWTP), in compliance with the United States Environmental Protection Agency (USEPA), Illinois Environmental Protection Agency (IEPA), and City of West Chicago's (City) and Village of Winfield's (Village) requirements. Local limits serve as a regulatory mechanism to control the discharge of pollutants to the Wastewater Treatment Plant, as pollutants may pose a threat to WWTP and collection system infrastructure, the environment, and human health and safety. The evaluation assesses potential risks and impacts of pollutant discharges on these systems to calculate local limits. This evaluation aims to determine whether the Authority must revise its current local limits. The most recent update to the Authority's local limits occurred in 2017. This local limit evaluation satisfies the WWTP's NPDES Permit Special Condition 11.A.8 which requires a technical local limit evaluation to be conducted within 24 months of the effective date of the NPDES Permit (due May 1, 2024). The calculations to develop local limits utilize 9 different sets of criteria to produce the most stringent limit that would most effectively address WWTP effluent quality concerns. These criteria are: • National Pollutant Discharge Elimination System (NPDES) Permit Daily Limits • NPDES Permit Monthly Limits • Activated Sludge Inhibition Levels • Nitrification Inhibition Levels • USEPA 503 Sludge Ceiling Regulations (EXCLUDED) • USEPA 503 Sludge Criteria for Clean Sludge (EXCLUDED) • USEPA Chronic Water Quality Standards • USEPA Acute Water Quality Standards • Anaerobic Digester Inhibition Levels USEPA 503 Sludge Ceiling Regulations and Criteria for Clean Sludge were excluded from this evaluation because the Authority landfills all sludge generated at the WWTP and has no plans to land apply in the future. The table on the following page summarizes the Authority's current local limits and the proposed revisions that resulted from this evaluation. Of all pollutants evaluated, the Authority will only be decreasing Nickel's local limit, all other local limits will remain unchanged. West Chicago/Winfield Wastewater Authority Local Limits Evaluation 2023 • 2325167.00 HITE OODMAI ===== PDF PAGE 87 ===== [Extraction: embedded PDF text] 1. EXECUTIVE SUMMARY p e 7 TABLE1 Executive Summary Table Current Proposed Local Limit Local Limit m L m L Ammonia Nitrogen Arsenic 2.0 2.0 BOD Cadmium 0.4 0.4 Chloride Total Chromium 5.0 5.0 Hexavalent Chromium 0.9 0.9 Copper 2.0 2.0 Cyanide 0.3 0.3 Oil & Grease 100 100 Oil & Grease (FSE) 200 200 Lead 2.0 2.0 Mercury 0.0005 0.0005 Molybdenum Nickel 0.9 0.6 Phosphorus Selenium Silver 1.0 1.0 TSS Zinc 3.0 3.0 H Units 5.0-10.0 s.u. 5.0-10.0 s.u. West ChicagofWlnfield Wastewater Authority Local Limits Evaluation 2023 • 2325167.00 IAITE OODMAN