Development of a Monitoring Study Design to Quantify the Trash Load Reduction Associated with On-Land Cleanups
The San Francisco Bay Region Municipal Regional Stormwater Permit (MRP) requires Permittees to implement trash load reduction control actions to reduce trash discharges from 2009 levels in accordance with a specific compliance schedule, to meet the goal of 100 percent trash load reduction or no adverse impact to receiving waters from trash by July 1, 2022. Control actions include installation of full trash capture systems and other trash management actions that achieve an effectiveness equivalent to or better than full trash capture systems. The effectiveness of other trash management actions is to be assessed using on-land visual assessments. The MRP also allows Permittees to provide substantive and credible evidence that certain management actions or sets of management actions, when performed to a specified performance standard, yield a certain trash reduction outcome reliably.
A two-phase project is being conducted through the Bay Area Stormwater Management Agencies Association (BASMAA) to quantify the trash load reduction associated with on-land cleanups. The ultimate goal is to develop a performance standard for the control measure, which could be implemented by Permittees in lieu of conducting ongoing on-land visual assessments. The first phase of the project, which is the subject of this presentation, is to develop the monitoring study design for a pilot study. The second phase of the project will include developing a prescribed procedure for conducting on-land cleanups and implementing the pilot study. The pilot study will test different frequencies of on-land cleanups in moderate, high and very high trash generating areas, performed using a prescribed cleanup protocol.
The presentation will illustrate the process by which the monitoring study design was developed and discuss the key components of the study design needed to show a reliable trash reduction outcome associated with on-land cleanups. The monitoring study design will identify key study variables and considerations such as, study site selection criteria, number of study sites and number of monitoring events at each site that are required to develop a data set that predicts trash reduction effectiveness within an acceptable degree of confidence.
The presenter will engage the audience by asking questions about on-land cleanup activities being performed in the various municipalities and engaging the audience in a discussion about how the project results could be applicable to municipalities subject to the Statewide Trash Amendments that select the Track 2 compliance alternative.
This presentation addresses the Conference theme because it illustrates a methodology that could be used to develop a performance standard to demonstrate the effectiveness of a trash reduction control measure. A successful project outcome would lead to reduced monitoring requirements, which would allow Permittees to refocus and reallocate resources to other stormwater resource management priorities.