MARYLAND DEPARTMENT OF THE ENVIRONMENT WATER AND SCIENCE ADMINISTRATION NOTICE OF TENTATIVE DETERMINATION Washington County Application for State Discharge Permit 24DP2434, NPDES Permit MD0062821: Maryland State Highway Administration (SHA), Environmental Compliance Division, 7491 Connelley Drive, Hanover, Anne Arundel County, MD 21076, applied for renewal of the permit to discharge an average of 12,500 gallons per day of treated domestic wastewater from the Sideling Hill Wastewater Plant (WWTP) located at Sideling Hill, Rt. I-68 West of Hancock, Hancock, Washington County, MD 21750 to Munson Spring Branch, which is designated as Use I-P waters – protected for water contact recreation, aquatic life, and public water supplies. The Department is proposing to reissue the discharge permit with the following effluent limitations: BOD5, 5.0 mg/l maximum monthly arithmetic mean and 8.0 mg/l maximum weekly arithmetic mean; total suspended solids, 30 mg/l maximum monthly arithmetic mean and 45 mg/l maximum weekly arithmetic mean; ammonia nitrogen limits of 8.9 mg/l maximum monthly average and 15 mg/l maximum daily average for winter months (10/1 to 5/31) as well as 0.68 mg/l maximum monthly average and 4.8 mg/l maximum daily average for summer months (6/1 to 9/30) as interim limits, which are effective from the effective date of this permit until the final limits are in effect, and 4.1 mg/l maximum monthly average and 8.7 mg/l maximum daily average for winter months as well as 0.32 mg/l maximum monthly average and 1.3 mg/l maximum daily average for summer months as final limits, which are effective no later than 18 months after the effective date of this permit; dissolved oxygen, 5.0 mg/l minimum at any time; E. coli limit of 126 MPN/100 ml maximum monthly geometric mean and pH maintained between 6.5 and 8.5. In case chlorine or any chlorine compound is used in any treatment process(es), including but not limited to disinfection, that could become a potential constituent of the effluent discharged from the facility, dechlorination is required to reduce total residual chlorine to 0.011 mg/l. This permit is in conformance with the Chesapeake Bay TMDL for Nitrogen, Phosphorus, and Sediment established on December 29, 2010. Per MD Environmental Article § 1–602(a)(2), an EJ score was calculated for this facility. The EJ Score is 27.70. This score has been calculated considering a combination of the following factors: Pollution Burden Exposure Percentile, Pollution Burden Environmental Effects Percentile, and Sensitive Population Percentile. For more information on how the score was calculated, launch the MDEnviroScreen tool from this website - https://mdewwp.page.link/EJ. Copies of the application, draft permit, and Summary Report & Fact Sheet (SRFS) are available on the Department’s Wastewater Permits Interactive Search Portal at https://mdewwp.page.link/WWPPortal. Search for “23DP0639” under “MD0021121” and click on the “More Info” button for the permit entry to generate a list of available documents for download.   If a written request is received by July 1, 2026, a public hearing on the tentative determination for this application can be scheduled. The request should be sent to the Maryland Department of the Environment, Water and Science Administration, 1800 Washington Blvd., Baltimore, Maryland 21230-1708, Attn.: Yen-Der Cheng, Chief, Municipal Permits Division and must include the name, address and telephone number (home and work) of the person making the request, the name of any other party whom the person making the request may represent, and the name of the facility and permit number. Failure to request a hearing by July 1, 2026 will constitute a waiver of the right to a public hearing on the tentative determination for this permit. Written comments concerning the tentative determination will be considered in the preparation of a final determination if submitted to the Department, to the attention of Yen-Der Cheng at the above address, on or before July 13, 2026. Any hearing-impaired person who requests a hearing may request an interpreter at the hearing by contacting Mr. Cheng at (410) 537-3363 or 1-800-633-6101, or by written request to the above address at least ten working days prior to the scheduled hearing date. Information supporting the tentative determination, including the draft permit and fact sheet, may be reviewed by contacting Mr. Cheng at the above telephone number to make an appointment or by written request to Mr. Cheng at the above address. Copies of documents may be obtained at a cost of $0.36 per page. 6/11, 6/18/26 #12389399