What's the Potential to Generate Alternative Compliance Stormwater Credits within Capital Improvement Programs?
Priority development projects, whether private development or public capital improvement projects, continue to be challenged both financially and physically with incorporating structural Best Management Practices (BMPs) to address post construction treatment requirements. Priority development projects have the option to treat stormwater offsite through an alternative compliance program. This program allows for greater flexibility by allowing water quality improvement to be considered at a watershed scale, thereby allowing the project proponent to consider offsite opportunities to provide greater water quality benefit.
An alternative compliance program has been developed in coordination with the San Diego Waterboard and includes a guidance document, tools and methodologies for calculating water quality equivalency for offsite alternative compliance projects. Project types include Retrofit BMPs, Regional BMPs, Water Supply BMPs and Land Restoration, Land Preservation and Stream Rehabilitation. Given the multiple types of projects that can be eligible for alternative compliance credit, there is the potential for projects that are already planned by agencies’ Capital Improvement Programs (CIPs) to generate credits that could be utilized by other priority development projects or capital improvement projects within the watershed. This presentation will cover two projects already defined within Riverside County Flood Control & Water Conservation District’s (RCFC&WCD) 5 year CIP project summary that have the potential to generate stormwater pollutant control credits and the methodologies used to quantify the amount of credit that each project could generate. The two selected RCFC&WCD projects include Wildomar Lateral C Basin and Murrieta Creek Basin. This presentation will also include an example Land Restoration project being considered within the City of Temecula that will generate credits from stabilization of existing dirt roads to be used to offset future transportation projects.
Attendees will gain key insight on how to determine if projects can generate alternative compliance credit or what project elements are needed to generate credit and how they may use credits for other constrained projects. CIP projects from RCFC&WCD the principal permittee, and the City of Temecula, a permittee, will be used as examples to demonstrate that existing CIPs can be utilized to generate alternative compliance credit.
To promote participant engagement, the presentation will first present the methodologies and types of alternative compliance projects. The audience will then be presented with specific CIP projects that are already planned and the appropriate methodology will be applied and the amount of credit will be quantified for each real-world project.
Results will demonstrate that stormwater compliance can be cost effective by presenting the costs per cubic foot of treated storm water that will result from the alternative compliance scenario. The amount of corresponding residential, commercial and/or transportation land area that could be offset by each scenario will also be included. These results will provide local jurisdictions with insight into how to generate stormwater credits from CIP related projects and how they may be used to address stormwater requirements for other constrained projects that are limited in the amount of stormwater treatment that can be provided.
The content of the presentation will address the conference theme “connect the drops” by providing the audience with opportunities to address the challenges of incorporating structural BMPs into priority development projects using an offsite alternative compliance program which provides greater overall water quality benefit at the watershed scale.