TMDL Sediment Sampling for Stream Restoration’s Protocols 1 and 5

Hannah Scholes, EIT, Design Engineer, KCI Technologies, Inc.

In the most recent updates to the Expert Panel guidance for stream restoration TMDL Protocol calculations, site specific sediment sampling was introduced as a new requirement for Protocols 1 and 5. This presentation will discuss the new sampling guidance, identify areas where the guidance lacks detail, and provide examples of how the guidance is applied. The frequency of sampling, location of sampling sites, the sampling mechanism, as well as the actual laboratory procedures all have an effect on the determined bulk density, total nitrogen, and total phosphorus concentration. Using example restoration projects, the field procedure for sampling will be discussed, including sampling issues and adjustments that happen on site. The results of laboratory analysis and how the data is used in calculations is discussed in terms of its effect on the credit generated by specific projects.


Author Bio

Hannah Scholes is a Design Engineer in KCI’s Natural Resources Management Practice in Sparks, MD. She graduated from the University of Delaware with a BE in Environmental Engineering and a MCE in Water Resources Engineering. She has experience in a wide variety of water resource engineering tasks including hydrologic and hydraulic analysis, stream assessment and design, monitoring, TMDL and impervious credit computations, and database management. While working in various capacities to support local municipalities in Maryland, Ms. Scholes developed an understanding of county NPDES permit requirements, database structures, and TMDL crediting procedures.