TH&Co environmental professionals include geologists and hydrogeologists licensed in California and Arizona who specialize in the following:

  • Human health risk assessment
  • Environmental modeling
  • Environmental site characterization
  • Environmental statistics

Our professionals have over 25 years of experience in environmental consulting on hazardous waste sites and permitted facilities following guidance issued by Federal and State agencies including:

  • U.S. Environmental Protection Agency (USEPA)
  • U.S. Department of Interior/Bureau of Land Management (BLM)
  • California Department of Toxic Substances Control (DTSC)
  • California Office of Human Health Hazard Assessment (OEHHA)
  • California Regional Water Quality Control Board (RWQCB)
  • Nevada Department of Environmental Protection (NDEP)
  • Arizona Department of Environmental Quality (ADEQ)

We work on behalf of private individuals, environmental consulting firms, water districts, and municipalities.  In addition to working on behalf of responsible parties, we also provide peer-review regulatory services to federal, state, and local environmental agencies including:

  • NDEP
  • ADEQ
  • San Luis Obispo County
  • Santa Cruz County

Our experience working on “both sides of the table” gives TH&Co a unique perspective that allows us to solve our client’s environmental problems in a time- and cost-effective manner.