Cofounder, HydroFocus Inc. • Conducts surface and groundwater quality assessments.• Develops models to evaluate water movement and solute transport.• Quantifies chemical and physical processes in the saturated and unsaturated subsurface.• Applies statistical techniques to analyze land and water resources.• Determines water sources using geochemical and age-dating techniques• Evaluates subsidence and subsidence mitigationRecent example experience includes the following.• Hydrologic analysis and modeling of proposed development. • Groundwater hydrologic and quality analysis related to agriculture.• Expert witness for groundwater contamination litigation which includes extensive data collection and groundwater flow and solute transport modeling. • Provided expert testimony in Delta island flooding litigation on subsidence-related causes of levee failure. • Geochemical analysis and groundwater and heat flow modeling of stream aquifer interactions in agricultural watersheds in northern California. • Evaluation of subsurface flow and seepage. Used water isotopes and modeling to determine effects, rates and nature of leakage.• Evaluation of groundwater supply, flow and quality in relation to land and water management practices in various locations in California.• Evaluation of processes affecting water quality – Sacramento-San Joaquin Delta. Field data collection and modeling to estimate organic carbon, mercury and salt load for different wetland and agricultural water management practices. • Measurement and modeling of subsidence in the Sacramento-San Joaquin Delta.• Consulting hydrologist for agricultural coalitions in the Central Valley and Central Coast, California.• Evaluation of subsidence mitigation strategies – Sacramento-San Joaquin Delta, California. Field data collection and modeling to evaluate water quality effects (including mercury) of different wetland management strategies for stopping and reversing the effects of subsidence.

Consulting assignments included the following: • Evaluated sea water intrusion, nitrate contamination and flow of groundwater and nitrate movement in unsaturated zone – Salinas Valley, California. • Analyzed water supply and quality issues– Santa Ynez Valley, California.• Developed water resources element of city General Plan – City of Lompoc.• Advised California Department of Water Resources on issues relating to subsidence in organic soils – Sacramento-San Joaquin Delta.• Quantified geochemical processes and groundwater flow for gold mining operations – northern Nevada.

Assistant District Chief: Guided hydrologic research, investigations and data collection programs throughout California:• Supervised and planned research of land- and water-management effects on subsidence and carbon fluxes – Sacramento-San Joaquin Delta.• Facilitated interactions among diverse projects and personnel.• Developed and maintained projects investigating processes affecting land and water resources.• Communicated research results to the resource management community and other audiences using published reports and oral presentations.• Established long range research and data collection activities.• Responsible for over 100 employees and an annual budget of over $11 million.

Project leader: Directed studies of processes affecting constituent mobility and transport. Evaluated transport processes in aqueous and gaseous phases. Conducted regional, subregional and local scale studies. Guided an interdisciplinary team that integrated multi-scaled data:• Defined water and solute movement to agricultural drainage systems.• Identified processes affecting trace element mobility in soil and water.• Evaluated and implement statistical methods.Directed hydrologic study of water quality, carbon fluxes and subsidence in organic soils – Sacramento-San Joaquin Delta:• Identified processes affecting subsidence.• Related carbon fluxes from organic soils to subsidence and global carbon balance.• Developed water and land management strategies for reducing subsidence.• Determined water management effects on drainage water quality

• Developed computer code to simulate solute transport and chemical reactions in soils and shallow groundwater. • Designed and implemented water movement and chemical experiments for the laboratory and field – Sacramento-San Joaquin Delta.• Completed Ph.D. dissertation on geochemical and hydraulic processes affecting soil and groundwater salinity – Sacramento-San Joaquin Delta.• Co-authored book chapter on simulating reclamation of salt affected soils.