04-10-2023 Council Packet - Laserfiche WebLink

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Prepared by: Bolton & Menk, Inc. MCM 3: ILLICIT DISCHARGE DETECTION AND ELIMINATION PLAN Orono SWPPP ǀ 0C1.126140 Page 3 Involvement Plan for more information. High Priority Areas 1. An inventory of priority areas having been identified as having a higher likelihood for illicit discharges shall be maintained as part of the City’s Municipal Storm Sewer System mapping. Priority areas shall be evaluated for potential inclusion based on the following: a) Land uses associated with business/industrial activities. b) Areas where illicit discharges have been identified in the past. c) Areas with storage of significant materials that could result in an illicit discharge. d) Areas with older infrastructure, where illegal connections and/or deteriorating sewer lines are more likely to exist. 2. High priority areas identified include the following locations: a) Navarre neighborhood – area includes 2 gas stations, a grocery store, multiple restaurants, and multiple small hazardous waste generators. b) Wayzata Boulevard neighborhood – area includes an industrial park, a Garden Center, and multiple small waste generators. Procedures for Investigating, Locating, and Eliminating Illicit Discharge 1. Illicit discharge identification and notification to the City a) Field staff – illicit discharges identified by field staff performing their routine duties, including inspections of construction sites, ponds, outfalls, and BMPs, shall notify the IDDE Plan implementer within 24 hours of detection. Notification by field staff shall include: staff name, potential type of illicit discharge (i.e. sediment, oil, grease, grass clippings, soap, etc.), location, and any other information related to the observed discharge (i.e. maps, pictures, videos, notes, etc.). b) Citizen – illicit discharges identified by Citizens shall be directed to the IDDE Plan implementer. Notification should include: identifier’s name, potential type of discharge, location, and any other information related to the observed discharge. c) High priority area – high priority locations shall be inspected by IDDE staff for illicit discharges once per year. If an illicit discharge is identified, elimination procedures shall be implemented as outlined by this plan. 2. Procedures for investigating and eliminating illicit discharges a) Initiation – upon receipt of an illicit discharge notification, an Illicit Discharge Report and Response Form shall be initiated immediately by the IDDE Plan implementer (see Appendix F). b) Investigation – an investigator shall be assigned by the IDDE Plan implementer as part of the initiation of the Illicit Discharge Report. The investigator will begin investigation of the report within 24 hours. The investigator shall document all labor, materials, and other costs associated with the investigation for invoicing the responsible party. When the source of the discharge is unknown, Drainage Area and Storm System Investigation methods shall be utilized by the investigator to trace the source of discharge. c) Drainage Area Investigation - Drainage area investigations shall be used when the