Final TMDLs Approved by EPA: La Trappe Creek, Lower Choptank River

The Lower Choptank River watershed (02130403) was identified on the 1996 303(d) list of water quality limited segments submitted to U.S Environmental Protection Agency (EPA) by the Maryland Department of the Environment (MDE).  The watershed was listed as being impaired by nutrients (due to signs of eutrophication expressed as low dissolved oxygen (DO)), fecal coliform, and suspended sediment.  The list acknowledged that only a portion of the watershed might be impaired, and that with additional information, the spatial boundaries of the impairment could be refined.  This document establishes TMDLs for two non-tidal portions of the watershed: TMDLs of carbonaceous biochemical oxygen demand (CBOD) and nitrogenous biochemical oxygen demand (NBOD) for an unnamed tributary of La Trappe Creek (UTLTC) and a TMDL of phosphorus for the UTLTC In-Stream Pond. The TMDLs described within this document were developed to address localized water quality impairments identified within these two portions of the watershed; the fecal coliform, suspended sediment, and nutrient impairments within other portions of the Lower Choptank River watershed will be addressed at a future date. 

The UTLTC is located in Talbot County, Maryland and lies between the Atlantic Ocean and the Piedmont Plateau in the physiographic province called the Atlantic Coastal Plain.  The UTLTC consists of three components:  the non-tidal UTLTC; the UTLTC In-Stream Pond; and the tidal UTLTC, which begins approximately 20 feet beyond the UTLTC In-Stream Pond. The UTLTC overflows to La Trappe Creek, a tributary of the Lower Choptank River located in Talbot County, Maryland.  This document does not address the tidal UTLTC; therefore, information regarding only the non-tidal UTLTC and the UTLTC In-Stream Pond is provided. 

TMDLs of Biochemical Oxygen Demand (BOD) and Phosphorus to an unnamed tributary and In-Stream Pond of La Trappe Creek to which the Trappe Wastewater Treatment Plant Discharges, in Talbot County, MD

(Approved on September 16, 2003)

EPA's Decision Letter

EPA's Decision Letter

Main Report


Appendix A


Appendix B


Tech Memo Pond


Tech Memo UTLTC


Comment Response Document     



Contact Information

Please direct questions or comments concerning this project to Maryland's TMDL Program at (410) 537-3818.