• Real Estate Risk Management (AAI Phase 1 and 2 ESA's)
  • Groundwater Resource Studies
  • Geologic Hazards Investigation
  • Expert Witness and Litigation Support Services
  • Sampling & Monitoring Services
  • UST Investigation / Remediation
  • UST Fund Claim Management
  • Geotracker Database Compliance and Management
  • Hazardous Materials Investigation and Management
  • Regulatory Compliance and Permitting Services
  • Project Planning / Management

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To learn more about how EGS approaches business and Client relationships, view our Mission Statement!

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to verify EGS' State licensed Geologists and Engineers. 




Praise from Our Customers

Environmental Geology Services in Santa Rosa, CA is pleased to share the following client comments from our customers.

“Environmental Geology Services, Inc. has provided investigation, monitoring and remediation services on a gas station site in Petaluma owned by a client. What might have been a typical UST removal and closure project was complicated by an unrelated on-site chlorinated solvent spill, a complex geologic and groundwater environment, and the presence of an on-site domestic well and numerous nearby, off site drinking water wells. These and other factors resulted in strict regulatory requirements for multiple phases of investigation and extensive monitoring. During the long course of this project EGS has demonstrated their professionalism in interactions with me and the Sonoma County and State regulators. They have exercised sound judgment and implemented appropriate solutions to the technical and regulatory challenges of the project. The project is now in the closure phase and we anticipate completion within the budget allowed by the State UST Fund. I have had a good working relationship with EGS throughout the long and demanding process of this project. I believe EGS is a very well qualified firm and am pleased to recommend them."  

  • Bryce Bauer, GE, Principal Geotechnical Engineer, Bauer Associates,(

“We have retained Environmental Geology Services on numerous projects over the past 15 years and have always been satisfied with the quality and timeliness of their work.  They have provided numerous Phase 1 Environmental Site Assessments for our clients’ projects, as well as UST removals, soil remediation, and hazardous waste management.  On some of our projects, USTs or soil contamination was discovered during construction, and EGS was able to provide rapid response to solve the contamination problems, allowing earth work and construction to proceed with minimal disruption of construction schedules.  We plan to use EGS to respond to our future environmental needs, and we strongly recommend them.”

  • Robin Lea, Tiburon home owner with UST and fuel impacts beneath house discovered during real estate transaction escrow period:

“Thanks so much for taking care of the repair (remediation), and again for all your efforts on my behalf.  Please feel free to use my name as a reference for a job well done.  You really made use of your "people" skills as well as your scientific expertise and kept us on track to our closing this Friday.”

  • Daniel S. Mason, Esq., Senior Partner, Zelle Hofmann Voelbel & Mason LLP, (  

“We retained Marc Seeley, Principal Geologist of Environmental Geology Services Inc., as an expert witness in a contract dispute between two large energy companies.Mr. Seeley provided effective expert opinion on the technical aspects of petroleum hydrocarbon site, remedial alternatives, and industry standards of practice.  Mr. Seeley was very knowledgeable, professional, responsive to our needs, and a pleasure to work with.  We are pleased to recommend him to others.”

“Environmental Geology Services has served as Napa Valley Petroleum's environmental consultant on numerous projects over the last ten years.  Their ability to navigate the regulatory compliance issues that goes along with being a UST owner/operator have proven invaluable to our company.  EGS achieved case closure at two of our UST sites, and is nearing completion on a third.  Additionally, they have successfully managed our State Cleanup Fund cost recovery claims for each site.  We recently had an incident that required immediate response for one of our domestic Client's.  EGS met that demand by assisting us with an expedited cleanup, regulatory consultation, and obtained case closure from the lead agency.  I highly recommend EGS for your environmental consulting needs, and am very satisfied with their service, professionalism, and results."  

“Environmental Geology Services, Inc. provided tremendous support to American AgCredit in updating our environmental policies and forms.  EGS is extremely knowledgeable, detail oriented, logical and reasonable, with significant experience in the environmental field which shows in their common sense approach.  They provide a good balance of risk assessment to cost.  EGS' qualities include expertise, value, and integrity.”

  • Doug Donmon, PE, President of Dimensions 4 Engineering, (

“I have worked alongside Marc Seeley and Environmental Geology Services on various projects since 2000. He has always been committed to the projects, innovative and has delivered his services in a timely fashion.  We value his expertise and recommend his services.”

“Environmental Geology Services, Inc. is my consultant of choice for environmental services. They are honest, professional and cost effective.”

“I really enjoyed working with Marc at my first job as a geotechnical engineer in the early 1980s.  Although I reported directly to another principal of the firm, I worked with Marc on the geological aspects of numerous projects, and always found Marc to be very knowledgeable, fair, and professional. I highly recommend Marc as an engineering geologist.”

  • Virgil Elliot, Percolation Testing Services, 707-664-8198:

“All my experiences working with Environmental Geology Services have been positive. They are experts in their field, and are always my first choice and my first recommendation when I or someone else is looking for a geologist to evaluate a site.”

“I have worked with Environmental Geology Services for eleven years now and Mr. Seeley and his staff are always very professional and are very knowledgeable geologists. They know so much about the environmental business, they make my job easier. Environmental Geology Services has worked with Clear Heart Drilling for over 20 years now. I would recommend their services to anyone searching for geology services.”

  • Jeff Monroe, Principal Consultant and Owner, Touchstone Developments, 530-701-1913:

“Touchstone Developments was retained as a prime remediation contractor for Chevron Services for their San Francisco Bay Area and northern California service station sites from 1991 through 1999. As the Principal Consultant of Touchstone Developments I retained Environmental Geology Services to provide their expertise and man power in support of our UST removals, replacements and soil / groundwater remediation projects.  This was a period of intense remedial work by Chevron which required rapid response and highly coordinated logistics.  EGS provided valuable geologic and technical services, allowing TD to focus on the permitting, management, and contracting side of the work.  EGS's experience with UST removal and remediation work plan preparation, and development of sample and analytical plans, as well as on site QA/QC services and reporting allowed TD to substantially increase our volume of work and profitability.  EGS provided quality service and their expertise in environmental engineering and geology was a valuable asset to us.  I am pleased to recommend EGS as a highly qualified and experienced environmental engineering and geologic consultant.”  

“I have worked with Environmental Geology Services, Inc. on numerous projects and always found their staff to be professional, understanding of our needs, and work well with clients and regulatory agency personnel.  When hurdles are encountered, they are able to keep the project moving. I have always enjoyed working with EGS and highly recommend them to others.”

  • James Dablos, Marin County, Home owner with subsidence problem:  

“Environmental Geology Services is very professional, very thorough, and do great work and follow-up. I recommend EGS for any of your Geologic needs. Notable qualities are great results and expertise.”