Keep it Simple, Scientists: The Benefits of Applying Risk Principles to Simple Sites

In the realm of environmental site assessment, it’s often the complexity of the task that can confound even the most experienced scientists. However, what’s sometimes overlooked is the potential for simplicity, and the benefits that come with applying risk-based principles to sites and their associated data. This is particularly relevant when dealing with seemingly straightforward sites that could hold hidden environmental risks.

Consider a scenario where a simple site is approached using two different methods. The first approach, Method 1, treats the site as a regular Tier 1 site, assuming that groundwater is not impacted. This method involves characterizing and delineating the potential environmental concerns (APECs) using minimal resources – two background boreholes and a focus on chloride. This approach is not only simpler but also significantly more cost-effective, with an estimated expense of $8,000 to $12,000.

In contrast, Method 2 approaches the same site with a risk perspective, aiming to comprehensively delineate APECs. This entails six background boreholes, more intensive sampling, including texture analysis and the use of Shelby tubes. The focus remains on chloride, but the approach is more detailed, with a minimum of four boreholes per APEC and additional deep boreholes for a dual-unit aquifer buffer. The cost, as expected, rises to approximately $17,000 to $20,000.

The initial planning of these approaches involves identifying key factors, including groundwater receptors, freshwater aquatic life, livestock and irrigation, and drinking water sources. Notably, the Tier 1 approach makes certain assumptions about freshwater aquatic life and specifies that it is 10 meters away from impacts. A crucial part of the risk-based approach is identifying all water bodies capable of supporting an aquatic ecosystem within 1000 meters and considering the potential exclusion of pathways for specific contaminants, depending on their distance from aquatic ecosystems.

The term “chlorides” is likened to a “swear word” in the offices of oil and gas companies in Western Canada. This is due to the challenging yet essential nature of delineating chlorides in soil to meet the lowest applicable guideline. Often, this requirement is overlooked or misunderstood in basic Phase 2 assessments. Neglecting this aspect can lead to regulatory rejection or unnecessary over-excision of salt-impacted soils. Scientists need to consider natural versus anthropogenic sources of chlorides and the depth of their impact on groundwater.

When it comes to Phase 2 sampling with Tier 2 in mind, specific requirements for soil texture, deeper boreholes, and lateral and vertical delineation must be addressed. The use of Shelby tubes is highlighted as a valuable tool, particularly for isolating geologic units with low hydraulic conductivity.

Moreover, the Native Prairie Protocol (NPP)* is emphasized as a key element for sites with soil salinity exceeding Tier 1 guidelines. It provides a framework to demonstrate that no adverse effects will occur to the plant community and groundwater resources, deeper than 2 meters.

One of the intriguing aspects discussed is the need for monitoring wells. While freshwater aquatic life (FAL) and the dual-unit aquifer (DUA) guidelines can be constraining, the data and borehole logs can be leveraged effectively to determine the depth to groundwater, sulfate concentrations in soil, and the presence of coarse intervals in saturation data.

In summary, the insight gained from this comparison is clear: simplifying environmental site assessment by adopting a risk-based approach has the potential to deliver substantial savings on remediation costs while maintaining a rigorous commitment to environmental safety and compliance. It underscores the importance of data, expertise, and careful consideration of site-specific factors in environmental science and consultancy.


Thank you for reading,
Lori

For Lori’s full presentation, which was presented at this year’s ESAA RemTech Symposium, please CLICK HERE


*Native Prairie Protocol (NPP)

Recent Insights

  • Charting the Course: Navigating the Dynamic Evolution of ESG Reporting

    In today’s corporate landscape, sustainability isn’t just a buzzword—it’s a driving force reshaping the way businesses operate and interact with the world. Central to sustainability is ESG (Environmental, Social, and Governance) reporting, a practice that began as a niche concept and has become a global imperative, prompting organizations to reassess their strategies, redefine success, and…

    Read More

  • 360’s 2024 Sustainability Report – Optimization = Opportunity

    360 is proud to release our 2024 Sustainability Report. Themed Optimization = Opportunity, this year’s report summarizes highlights, successes, and changes for our growing organization. We reflect on a year that was dedicated to enhancement, modification, and our commitment to Making a Difference and Making it Simple. As part of the Optimization theme, the 360 Sustainability Committee had…

    Read More

  • Exploring New Frontiers: A Blueprint for Success in New Market Expansion

    “I don’t know, I’m making this up as I go!” Indiana Jones was my childhood hero growing up, but taking Indy’s famous approach when evaluating and entering a new geographical market is not the best strategy. Evaluating opportunities and costs before entering a new market or region is a crucial process that requires a comprehensive…

    Read More

  • Navigating the Human-Tech Partnership: Embracing Soft Skills in an Automated Era

    If my computer had arms, it would probably slap me in the face at the end of my work day.  I swear at it, give it dirty looks, and then throw it in a bag until I need it again.  However, I rely on it to perform most of my daily work routine.  Whether it’s…

    Read More