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Aaron Poresky

Hydropower Licensing and Compliance

2026-09-23T13:26:26-06:00April 15th, 2026|Tags: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |

To help clients achieve stringent water quality goals, Geosyntec provides rigorous assessment and modeling services to assess the sources and factors that affect the delivery of critical pollutants across watersheds. Through our comprehensive studies and analyses, we provide technically defensible tools and approaches that can be used in the development of Total Maximum Daily Load (TMDL) calculations and watershed protection plans. In addition, we frequently turn to Use Attainability Analyses to examine site-specific water quality criteria that affect attainability goals under natural, human-caused, and economic conditions. Our hydrodynamic and water-quality models integrate inputs from point and nonpoint sources to support our engineers and scientists as they study impacts on water quality in receiving water. These models allow us to understand the assimilative capacities of a given body of water, propose best management practices that can affect pollutant impacts, and predict the time required for a system to recover after being altered. Using watershed studies, water quality monitoring, and hydrological and hydrodynamic modeling, we also can assess compliance with local, state, and federal water quality standards. Using all this information, we are better able to evaluate the magnitude, frequency, and duration of impacts of a wide variety of pollutant sources. Our practitioners offer extensive experience with geographic information system applications for spatial analysis, planimetric and thematic mapping, and data representation. We employ watershed models including the Watershed Characterization System (WCS), Better Assessment Science Integrating Point and Nonpoint Sources (BASINS), and the Watershed Assessment Model (WAMView). We also employ the Water Quality Analysis Simulation Program (WASP), the Environmental Fluid Dynamics Code (EFDC), and the Stream Water Quality Model (QUAL2K) for hydrodynamic and water-quality models. Our practitioners are at the forefront of policy analyses, regulatory compliance, and technology applications that promote sustainable water resources management and ecosystem restoration. We have extensive experience helping local governments develop and negotiate long-term control plans for combined sewer overflows, National Pollutant Discharge Elimination System (NPDES) permits, and consent orders. We also comment on Clean Water Act issues at the state and national level, including the development of new recreational use criteria for water bodies across the county and for the U.S. Environmental Protection Agency's new framework for integrated planning for wastewater and stormwater.

Promotion of New Principals and Senior Principals for 2025

2026-03-17T14:04:18-06:00July 23rd, 2025|Tags: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |

Geosyntec announces our 2025 class of Principals and Senior Principals. These individuals exemplify the values that define the firm: collaboration, inclusion, innovation, safety, and passion for excellence.

Planning for Stormwater Infiltration and Filtration Success

2026-03-24T12:10:06-06:00May 19th, 2025|Tags: , |

Because stormwater infiltration and filtration projects can be complex, it’s critical that they be effectively planned, designed, and constructed to operate correctly over the long term with reasonable ongoing operations and maintenance (O&M).

Geosyntec Stormwater Experts Contribute to CASQA 2024

2026-03-17T13:03:56-06:00October 14th, 2024|Tags: , , , , , , , , , |

Geosyntec practitioners will speak, moderate, and lead a training workshop at the Twentieth Annual California Stormwater Quality Conference (CASQA) from October 21 through 23, 2024.

Jared Ervin, Brandon Steets, and Aaron Poresky Coauthor Paper on Bacterial Analyses in MS4s “in the Journal Environmental Pollution

2026-03-15T10:24:30-06:00September 29th, 2023|Tags: , , |

Jared Ervin, PhD, Brandon Steets, PE, and Aaron Poresky, PE, coauthored “Municipal Separate Storm Sewer System (MS4) Dry Weather Flows and Potential Flow Sources as Assessed by Conventional and Advanced Bacterial Analyses” in the Journal Environmental Pollution, Volume 337, on November 15, 2023.

Geosyntec to Present at CASQA 2023 in California

2026-03-15T10:24:26-06:00September 7th, 2023|Tags: , , , , , , , , , , |

Geosyntec will present at the Nineteenth Annual California Stormwater Quality Association (CASQA) at Paradise Point in San Diego, California, on September 11 to 13, 2023. Lauren Godinez, Neftali Romero, EIT, Brandon Steets, PE, Zahra Maleki, PhD, Megan Otto, PE, Rinta Perkins, Jared Ervin, PhD, Maxwell Dugan, PE, Kelly Havens, PE, Stephanie Zinn, and Maia Coylar, PE, Lisa Welsh, PhD, Kelly Havens, PE (California), and Aaron Poresky, PE (Oregon), will speak at the conference.

On-Demand Geosyntec Technical Webinar Series

2026-09-25T10:34:25-06:00January 10th, 2022|Tags: , , , , , , , , , , , , , , , , , , , , , , , , , , , |

Below are on-demand webinars.

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