Soil boring investigations are commonly conducted as part of the assessment and remediation process for underground storage tanks (USTs). Here’s an overview of how soil boring investigations are typically conducted in this context:

  1. Site Assessment: Before conducting soil borings, a site assessment is typically conducted to gather information about the USTs, including their type, size, contents, age, and condition. This initial assessment helps to identify potential sources of contamination and determine the extent of the investigation needed.
  2. Selection of Boring Locations: Based on the results of the site assessment, locations for soil borings are selected to provide representative samples of soil and groundwater around the USTs. Borings are typically spaced strategically to cover the entire area of potential contamination and to capture any migration pathways.
  3. Drilling: Soil borings are typically drilled using a drilling rig equipped with hollow-stem augers, direct-push technology, or other drilling methods suitable for the site conditions. The depth and number of borings depend on factors such as the depth of the USTs, soil characteristics, and regulatory requirements.
  4. Soil Sampling: Once the borings are completed, soil samples are collected at various depths using soil sampling tools. Samples are typically collected from different soil horizons and visually inspected for signs of contamination, such as staining or odors.
  5. Groundwater Monitoring: In addition to soil sampling, temporary groundwater wells may be installed in select borings to collect groundwater samples for analysis. These samples can provide valuable information about the vertical and horizontal extent of contamination and the direction of groundwater flow.
  6. Laboratory Analysis: Soil and groundwater samples are analyzed in a certified laboratory to determine the concentrations of various contaminants, including petroleum hydrocarbons, volatile organic compounds (VOCs), and other hazardous substances associated with USTs.
  7. Data Interpretation and Reporting: Once the laboratory analysis is complete, the data are interpreted to assess the extent and severity of contamination, potential risks to human health and the environment, and the need for remediation. A report summarizing the findings of the soil boring investigation is typically prepared and submitted to regulatory agencies as part of the site assessment and remediation process.

Soil boring investigations play a crucial role in the assessment and cleanup of UST sites by providing valuable information about the nature and extent of contamination, which helps guide remediation efforts and ensure the protection of human health and the environment.