ASTM E1903-11 Soil Vapor Intrusion Risk Investigation

Caltha LLP Project Summary

Project: SBA Vapor Intrusion Risk Study
Client: National Bank
Location(s): Saint Paul, Minnesota

Key Elements: Site investigation, subslab soil vapor testing, vapor encroachment, Small Business Administration loan

Overview: Caltha LLP conducted a Soil Vapor Intrusion Risk Assessment for this commercial property located in St. Paul. The Phase 1 assessment conducted a Tier I Vapor Encroachment Screening Assessment using ASTM E2600-10. This assessment determined that the potential for risks of vapor intrusion could not be screening out, therefore a Phase 2 vapor intrusion risk study was recommended.


An investigation approach was prepared which met the requirements of ASTM E1903-11 (Standard Practice for Environmental Site Assessments: Phase II Environmental Site Assessment Process). Subslab soil gas samples were collected from inside the building. Results were compared to MPCA vapor intrusion screening values. Although some volatile organics were detected in subslab soil gas, all concentrations were below agency risk-based screening values.


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Geoprobe Investigation of Former Bulk Fueling and Maintenance Facility

Caltha LLP Project Summary

Project: Phase 2 Soil & Groundwater Limited Site Investigation
Client: Regional Bank
Location(s): Minnesota

Key Elements: Geoprobe survey; soil sampling; groundwater sampling

Overview: Caltha LLP was retained by a regional bank to conduct a Phase 2 investigation on a property located in central Minnesota. A Phase 1 ESA had revealed that a bulk fueling operation and heavy truck maintenance facility had been operated on the site, which had been demolished prior to redevelopment. No records of tank closure or demolition records could be located.


The site investigation included soil borings in the area of bulk fuel tanks, along the foot print of the maintenance building and downgradient of these areas to detect if past petroleum releases had occurred.


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Environmental Due Diligence Audit of Mississippi Facility

Caltha LLP Project Summary

Project: Techncial Support for Environmental Due Diligence During Corporate Merger
Client: National Food Ingredient Manufacturer/External Legal Counsel
Location(s): Mississippi

Key Elements: Technical support to resolve issues related to due diligence assessments, environmental compliance audit, Phase I ESA

Overview: Caltha LLP provided expert technical support to this national food manufacturing corporation through their external legal counsel. Work was to provide expert technical reviews and consultant services related to due diligence performed by the merger partner consultant. Issues were related to resolving Recognized Environmental Conditions, conformance to the new ASTM Standard Practice E 1527-13, and obligations related to shared environmental permits for air emissions, wastewater and stormwater.


For more information on Caltha LLP due diligence and merger/acquisition support services, go to the Caltha Contact Page

Board Certified Due Diligence Auditors Available For Environmental and Safety Audits

Caltha LLP provides IAA-BEAC certified auditors to perform EH&S audits to support due diligence for organizations or to support routine internal audit programs implemented as part of an overall governance system. Caltha can provide:

• Single auditors to support audit teams as a media or regulatory expert,
• Audit teams to address multiple program areas, or
• Due diligence auditors / audit teams.

Caltha auditors can act as adjunct auditors to augment your existing internal audit team, or can act as an independent third party auditor.


Caltha auditors have conducted assessments in all 50 US States, Canada, Mexico, South America, Europe and Asia.


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