Print this profileClose this window

Refining the Characterization Conceptual Site Model Using Direct Push Technology/Membrane Interface Probe and Implementation of a Redox Remedy at the Heflin Garage Fuel Release Site, Falmouth, Virginia

Triad Elements Used

Triad logo

Table of Contents

  1. Site Information
  2. Project Information
  3. Triad Approach Information
  4. Supporting Information


The refinement of the characterization Conceptual Site Model (CSM) using Direct Push Technology (DPT)/Membrane Interface Probe (MIP) assisted in implementing the application of the Dissolved Oxygen In-situ (DO-ITTM) remedy.

Quarterly monitoring at the site has shown positive results of the DO-ITTM application within the residential portion of the site. Results from the other portion of the site are not as positive and an additional application of the remedy is being considered.

1. Site Information

Site Name Heflin Garage
Location Falmouth, VA
Site Type  Gasoline Service Station/Petroleum Storage Facility
Site Regulatory ID  PC 1989-1102
Project Lead Type  State Lead
Regulatory Lead Program  State Remedial
Reuse Objective Identified  Yes
Proposed Reuse:  Residential and Commercial/Industrial

Background Information About Site 

Heflin?s Garage is a towing and truck repair facility with residential surroundings. In 1986, petroleum was appearing in the local residences' drinking water wells and in the early 1990s, Heflin?s underground and aboveground storage tanks were removed from the site. In 2006 and 2007, Environmental Protection Agency?s (EPA) Technology Integration and Information Branch (TIIB) and the Argonne National Laboratory worked with staff from the Virginia Department of Environmental Quality (VDEQ) to apply Triad principles at the site.

Contaminant(s) of Concern 

Contaminated Media 

2. Project Information

Project Objectives/Decisions 

The objectives for this project were to:

Remedial Phases

Triad Project Benefits 

3. Triad Approach Information

Systematic Project Planning 

Meetings were held with stakeholders, including the VDEQ, EPA TIIB, Argonne National Laboratory, and the VDEQ Underground Storage Tank State Lead contractor. Phone conversations were held as needed to disseminate site-work related updates, and a QuickPlace website was used to assist data distribution.

Using sampling transects, the extent of contamination was identified using DPT/MIP, with contamination extent estimation assisting with remedy implementation. DPT/MIP-related data was depicted and distributed in a 3-dimensional model.

Dynamic Work Strategies 

A dynamic work strategy (DWS) supported field decision-making and advancement of the CSM. Investigation using DPT/MIP analysis assisted in delineating the area of contamination. Co-located soil and groundwater samples were collected for confirmation and to estimate contaminant mass.

Real-Time Measurement Technologies 

The real-time technology used in this project was a membrane interface probe (MIP) which was used to determine the extent of the source area, and analyzed 17 locations for the presence of petroleum hydrocarbons. MIP data were incorporated into a 3-dimensional graphical model and provided real-time via the QuickPlace website for use by the project team, including regulators.

The DPT/MIP on-site laboratory produced preliminary data in less than one hour and high-quality data in 24-36 hours. Data was entered daily into visualizations to allow real-time decision making for subsequent sampling locations. Data generated during the DPT/MIP investigation identified the extent of contamination and aided in the DO-ITTM Remedial Strategy implementation.

Technology Category(s) for Sampling and Analysis 

Specific Technology(s)/Model Used (e.g., SCAPs) 

Attached Technology Quick Reference Sheet (TQRS) Form 

TQRS not prepared

4. Supporting Information

Key Triad Project Milestones 

Source(s) of Information

Electronic Documentation of Supporting/Related Information

PDF 2007 Monitoring Results (4,657 KB)
PDF Heflin Locations (185 KB)
Link Virginia Petroleum Release Sites website

Point(s) of Contact 

James Barnett
Virginia Department of Environmental Quality
Telephone icon 804-698-4289
E-mail icon

Michael Adam
Environmental Scientist
U.S. Environmental Protection Agency
Telephone icon 703-603-9915
E-mail icon

Louis Martino
Argonne National Laboratory
Telephone icon 202-488-2422
E-mail icon

Last Update:  01/27/2012

To update this profile, contact Cheryl T. Johnson at or (703) 603-9045.