CGRS is a full-service environmental company with decades of experience in the environmental compliance industry. Backed with a diverse team of environmental professionals, CGRS has the knowledge and experience to complete reporting for all due-diligence needs, including Phase I Environmental Site Assessments (ESAs), Phase II ESAs, and any surface and subsurface investigation requirements.


Phase I Environmental Site Assessment

The purpose of completing a Phase I ESA is to help satisfy all appropriate inquires and provisions of the Comprehensive Response, Compensation and Liability Act (CERCLA) by assisting the client in assessing the environmental condition of and identifying potential recognized environmental conditions (RECs) associated with the properties of interest. This practice is intended to permit a user to satisfy one of the requirements to qualify for the innocent landowner, contiguous property owner, or bona fide prospective purchaser limitations on CERCLA liability. CGRS conforms to the American Society for Testing and Materials International (ASTM) standard practice for the preparation of Phase I ESAs (ASTM E1527-21), which is considered good commercial and customary practice for performing Phase I ESAs. It is CGRS’ goal to seamlessly assist clients through the due-diligence process and produce a robust Phase I report. CGRS generally completes Phase I ESAs in approximately four weeks. Requests for an expedited turn around time (e.g., two weeks, etc.) will be evaluated on a case-by-case basis.

Call a CGRS Expert:

Glen Vallance - Environmental Consulting Company - CGRS

Glen Vallance, REM
Environmental Services
Mobile: 970.420.6840

Phase II Environmental Site Assessment

A Phase II ESA is a critical component that may be recommended based on findings from a Phase I ESA or if a user wishes to attain data that is applicable to the environmental condition of a property. These conditions include but are not limited to the objectives set forth in the ASTM E1903-19 Standard Practice for Phase II Environmental Site Assessment Process.

The Phase II scope of work is based on the user and the assessor’s consultation to define the scope of objectives with an understanding of the site location, potential chemicals of concern (COC), and the end goal clearly specified.

CGRS has experience executing the following investigations:

  • Surficial and subsurface soil investigations
  • Groundwater and surface-water investigations
  • Soil-vapor investigation
  • Ambient-air investigation

The goal of the investigation is to evaluate for the presence or absence of contamination in areas of concern, as identified in the conceptual site model (CSM). The data collected will be used to update and validate the CSM. The final report will follow ASTM practices and document the findings of the investigations, conclusions and, if appropriate, may include recommendations.

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CGRS has in-depth experience performing due-diligence ESAs for all manner of properties including:

  • Undeveloped
  • Industrial
  • Commercial
  • Agricultural

CGRS’s ESA customers throughout the Western United States include:

  • Private citizens
  • Industrial corporations
  • Investment firms
  • Developers
  • Law firms
  • Insurance companies
  • Financial institutions


Land owners, lenders, insurers and investors can inherit liabilities for hazardous-waste disposal and other site risks under environmental laws and regulations that went into effect in 1980. The cost to remediate contaminated property can often exceed the value of the property itself. In addition to our expertise in phases of environmental site assessments (ESAs), CGRS possesses the most effective skills, methods and technologies for performing as well as assisting with hazardous waste management.

Drilling - CGRS
Environmental Assessment - CGRS
Environmental Assessment - CGRS

Hazardous Waste Management

Wherever chemicals, fuels, or other hazardous materials are stored, processed or consumed, a risk of releasing that material to the environment exists. In the event of a hazardous material (HAZMAT) release, emergency responders must have all the necessary information to safely control the release and prevent injuries to the public or damage to the environment. For this reason, federal and state regulations require facilities that manage hazardous materials to maintain written HAZMAT Emergency Response Plans.

CGRS’s typical hazardous waste management services include:

  • Waste characterization, manifesting and disposal
  • Development of waste inventory programs
  • Development of hazardous material management and contingency plans
  • Remedial investigations
  • Liaison between clients and state and/or federal agencies
  • Hazard analysis and spill prevention, control and countermeasure (SPCC) planning
  • Addressing possible on- and off-site consequences and impact of potential releases of hazardous chemicals on humans, the environment and the economy