Serving Northern California and the Greater San Francisco Bay Area
Over 30 Years of Experience in Environmental Consulting

Environmental Consulting Services

Phase I Environmental Site Assessments

GEOTERREN performs high quality due diligence activities for commercial property transfers, refinancing, and redevelopments. 
The standard for Phase I ESAs has been updated as of December 31, 2022: ASTM E1527-21.

Phase II Environmental Site Assessments/
​Remediation

GEOTERREN answers your environmental questions, designing targeted soil, soil vapor, groundwater, and indoor air sampling programs to cost-effectively address your site investigation and remediation needs.

Other Services

Our other services include peer review, scientific and engineering graphics, forensic site evaluation, and litigation support.

 San Francisco Maher Zone

Expanded Maher Zone
Do you know if your proposed redevelopment project in
San Francisco lies within the Maher Ordinance Zone (i.e., the original area of historical contamination associated with the 1906 earthquake and fire)?  

The Maher Zone  was expanded in March 2015 to include:
  • The original zone along the San Francisco Bay Shoreline
  • Areas currently or historically zoned for industrial purposes
  • Areas currently or historically utilized for industrial purposes
  • Areas of Bay Fill
  •  Areas within 150 feet of U.S. Highway 101 and Interstate 280 and 880
  • Areas within 100 feet of an Underground Storage Tank (UST)

If your site lies within one of these areas, you will likely be required by the SF Building Department to submit a site history (among other documents) prior to obtaining grading or excavation permits,  You may be required to perform a site investigation that conforms to SF Public Health Department requirements.

Is your environmental consultant  knowledgeable about Maher Zone requirements?  

GEOTERREN has 30+ years of experience in the environmental consulting industry.
GEOTERRENEnvironmental Services - Experienced and Expeditious  - providing you the best possible product. On time and on budget.