STATE OF MARYLAND
DEPARTMENT OF THE ENVIRONMENT
WATER AND SCIENCE ADMINISTRATION
TENTATIVE DETERMINATION TO MODIFY A STORMWATER PERMIT
The Maryland Department of the Environment (MDE) has reached a tentative determination to modify the National Pollutant Discharge Elimination System (NPDES) Municipal Separate Storm Sewer System (MS4) permit issued to Charles County to control storm drain system pollutant discharges. MDE has drafted permit modifications designed to comply with the United States Environmental Protection Agency’s (EPA) regulations, control stormwater pollutant discharges from Charles County’s storm drain system, and allow Charles County to use Maryland’s newly authorized nutrient trading program as an option to meet its 20 percent impervious surface restoration requirement.
The EPA regulations (40 CFR Part 122.62) and current permit conditions (see Part VII.E.1, Permit Revocation and Modification) allow for NPDES permits to be modified for an appropriate cause. Charles County officially requested a modification of its current permit (Discharge Permit Number 11-DP-3322 MD0068365) on May 31, 2019, to allow the use of nutrient trading to meet the 20 percent impervious surface restoration requirement by the end of the current permit term (i.e., December 25, 2019). MDE has determined the use of nutrient credits by Charles County for meeting the 20 percent impervious surface restoration requirement is acceptable. Therefore, MDE hereby proposes to add a new paragraph that allows for nutrient trading to meet this requirement in PART IV.E.3; and to rename the original permit’s PART IV.E.3 and PART IV.E.4 as PART IV.E.4 and PART IV.E.5, respectively.
For more information on stormwater management in Maryland or to view the proposed permit modifications go to: mde.maryland.gov/programs/Water/StormwaterManagementProgram/Pages/storm_gen_permit.aspx or contact Mr. Raymond Bahr at 410-537-3545 or 1-800-633-6101. Copies of the document may be procured at a cost of $0.36 per page. MDE will hold a public hearing concerning the tentative determination to modify Charles County’s MS4 permit on Wednesday, July 31, 2019, at 6 PM, Charles County Government Building, 200 Baltimore Street, La Plata, MD 20646. Comments on this tentative determination to modify Charles County’s MS4 permit will be accepted by Raymond Bahr, Maryland Department of the Environment, Water and Science Administration, 1800 Washington Boulevard, Baltimore, Maryland, 21230, or firstname.lastname@example.org, if received within 90 days of publication of this notice. The 60-day extension of the comment period allowed for by section 1-606 (d) (1) (ii) of the Maryland Environmental Article is being invoked to extend the usual 30-day comment period to 90 days.