At ETEC, we take a collaborative approach to site evaluation. We are happy to help with site evaluations and do so free of charge. The first question we’re often asked is, “what data do you need?” Complete data helps fill in the gaps that could otherwise derail a site remediation strategy. Below are a few details we look at when evaluating potential sites for bioremediation:
Contaminant type
The first step is a comprehensive chemical analysis to identify all pollutants, including hydrocarbons and organics. This will guide the selection of specific bioremediation methods suitable for each contaminant. A few examples include:
- Petroleum Hydrocarbons
- Chlorinated Solvents
- Explosives
- Chlorinated Pesticides
- Hexavalent Chromium
- Nitrate
Geochemical conditions
Geochemical data includes field parameters obtained during groundwater sampling:
- pH
- Dissolved oxygen (DO)
- Oxidation-reduction potential (ORP)
- Total dissolved solids (TDS)
- Conductivity
It also includes sample analytical results from the laboratory. The parameters can vary based on the contaminant.
Petroleum Site cVOC Site TPH/TRPH (full range) Sulfate Nitrate TOC Ammonia Dissolved Gases (Methane/Ethane/Ethene) Phosphorus Ammonia Iron Phosphorus Manganese Iron Manganese Concentration levels
Detailed quantification of contaminants will help in assessing the extent of pollution and in monitoring the progress of bioremediation over time.
- Historic analytical table showing contaminates of concern
- Include regulatory limits
Site history
A thorough investigation into the site’s previous industrial or agricultural activities can reveal potential sources of contamination and inform risk assessments.
- Site name and site address
- Site map showing well and soil boring locations
- Subsurface and overhead utility locations
- Release information
- Past remediation activities
- Aquifer testing (pump test, injection test)
Soil and groundwater characteristics
Detailed soil surveys and groundwater sampling should be conducted to determine texture, stratification, mineral content, and existing pollutant levels. These factors are critical in predicting the movement of contaminants and the feasibility of microbial degradation.
- Soil Analytical (including smear zone)
- Fraction organic carbon (FOC)
- Well construction (depth, screened interval) and depth to water
- Groundwater elevation map showing flow direction
- Subsurface geology information (boring logs and/or cross-sections)
Environmental conditions
Long-term climate data and current environmental conditions should be analyzed to determine the optimal timing for bioremediation activities and any necessary adjustments to the process.
Regulatory Framework
An in-depth review of applicable environmental laws will ensure that the bioremediation plan meets all legal requirements and standards.
Community Impact
Engaging with local stakeholders to assess potential impacts on human health, local businesses, and the environment is crucial for gaining support and ensuring a socially responsible approach.
By gathering detailed information in these areas, stakeholders can make informed decisions about the viability and design of a bioremediation project.