As leaders in the successful development of municipal and industrial stormwater management programs since the inception of stormwater regulations in the early 1990’s, we’ve had the pleasure of assisting numerous public agencies and private entities throughout California. Our innovative strategies and practical approaches to stormwater management have helped our clients not only consistently achieve compliance with challenging National Pollutant Discharge Elimination System (NPDES) requirements, but also earn awards at the national and State levels. Our stormwater management services areas include:

  • New and redevelopment controls, including Green Stormwater Infrastructure
  • Municipal operations and maintenance
  • Industrial and commercial facilities
  • Illicit discharge controls
  • Pesticide/toxicity management
  • Trash/litter management
  • Public outreach and education

We also provide a variety of technical support and project management assistance on specific Pollutant Control Programs (e.g., metals, organic chemicals, litter/trash and toxicity), Watershed Management planning, and Water Quality Monitoring & Assessment programs.



Municipal Stormwater Monitoring and Assessment
Santa Clara Valley Urban Runoff Pollution Prevention Program (SCVURPPP)

EOA staffs, manages and implements all aspects of the Receiving Water Monitoring Program for SCVURPPP, which is designed to assess the condition, impacts and trends in beneficial uses, water quality and sediment quality in receiving waters in the South San Francisco Bay watersheds. EOA assesses and reports on watershed conditions through analysis of past and recently collected data and by conducting creek status monitoring, including the collection of data on aquatic life use, pollutant and recreational condition indicators. We also develop hypotheses and implement investigative monitoring in high priority areas, to better understand the extent and magnitude of stormwater impacts on beneficial uses and to identify high priority areas where management actions can be implemented to protect or restore beneficial uses. Additionally, EOA develops and implements  quality assurance and control procedures consistent with the State of California’s Surface Water Ambient Monitoring Program (SWAMP) comparability standards.


SF Bay Regional Creek Status Monitoring Program Design
Bay Area Stormwater Management Agencies Association (BASMAA)

On behalf of all members of the Bay Area Stormwater Management Agencies Association (BASMAA), EOA developed a regional monitoring program design to assess the condition of Bay Area creeks in compliance with NPDES permit requirements. The monitoring design was developed using the Generalized Random Tessellation Stratified (GRTS) approach (developed by the United States Environmental Protection Agency (USEPA) and Oregon State University) to develop a spatially balanced design that produces statistically representative data with known confidence intervals. BASMAA member agencies implement the design in compliance with their municipal stormwater NPDES permit requirements.


Industrial Stormwater Monitoring and Analysis
Port of Oakland

For each of the past several years, EOA has assisted the Port of Oakland in preparing an annual Group Evaluation Report (GER) that documents the results of the Port’s annual stormwater runoff monitoring and facility inspections. The monitoring was performed in compliance with the statewide NPDES General Industrial Permit (GIP) to regulate stormwater discharges from industrial facilities. The GER includes an evaluation and summary of all stormwater runoff monitoring chemical analysis data (e.g., petroleum hydrocarbons, metals, and volatile organic compounds); an evaluation of the overall performance of the industrial facilities in complying with the GIP; a recommended baseline and site-specific Best Management Practices (BMPs) that should be considered by each industrial facility based upon items (1) and (2) above and annual site inspections; and evaluation reports with recommendations to improve BMP implementation prepared by the Port following site inspections of individual facilities. EOA has also provided the Port with occasional regulatory analysis and assistance over the past several years in relation to topics such as the Port’s Stormwater Pollution Prevention Program and various statewide stormwater permits (i.e., GIP, Construction General Permit and Phase II).