Development and Implementation of the Tahoe Basin TMDL, 2006-13; All regulatory and jurisdictional partners

2NDNATURE continues to be an integral technical contributor to the Lake Tahoe TMDL development and implementation program, participating in all aspects of the program. Our technical involvement includes:

RoadRAMCoverCropped • Identifying and quantitatively testing potential pollutant control options for nutrient and sediment loads (2008) – TMDL Pollutant Reduction Opportunity Report
• Water quality module design for PLRM – the accepted tool to estimate the load benefits of water quality improvement actions.
• Lead technical developer of BMP RAM and Road RAM – the accepted annual monitoring tools to demonstrate compliance.
• Technical partner in the design of the Lake Clarity Crediting Program to align load reduction estimates with annual reporting requirements.
• Designing and drafting TMDL Synthesis of Findings (2014) – a process and platform to document and integrate new science continually into the TMDL program.
• Contributing to Stormwater Load Reduction Plans to guide jurisdictions to prioritize resources to meet TMDL requirements. Placer County Stormwater TMDL Strategy Technical Report

All of the Tahoe Basin jurisdictions face a number of funding and programmatic challenges in implementing the TMDL, and 2NDNATURE aims to provide information and insight into the cost/benefit analyses of different water quality improvement actions moving forward.


PVWMA Salt and Nutrient Management Plan (SNMP), 2012-2015; Pajaro Valley Water Management Agency

PVWMA_FertilizerUse22NDNATURE is leading the compilation, analysis and implementation strategy development for PVWMA to reduce the impacts of salts and nutrients on local groundwater. This regulatory requirement includes a compilation of existing studies and data to complete a fate and transport analysis of salts and nutrients in the basin. 2NDNATURE will apply concepts and analysis techniques learned from TMDL implementation plan development to identify and guide priority salt and nutrient management strategies in the PVWMA basin. Concise and measurable objectives of future salt and nutrient conditions will be developed, and progress toward these objectives will be tracked per the monitoring plan specifications. A comprehensive evaluation of the PVWMA surface water and groundwater quality monitoring program is being conducted by 2N. Initial steps include an historic evaluation of the existing program using statistical methods to identify site and parameter repetition, spatial and temporal data gaps and provide specific recommendations for PVWMA to optimize the value of their monitoring programs to answer key management questions. Each of the components of the SNMP will be developed with extensive stakeholder input to ensure alignment with the concurrent IRWMP update.