Groundwater Sampling & Analysis

Challenge & Solution

In an effort to achieve groundwater protection standards (GPS) and system closeout, the federal government selected Rhea to monitor, and operate and maintain two closed landfills in Virginia.

Field services include the semi-annual collection of groundwater samples from approximately twenty locations using low flow purging methods; methane monitoring; inspection of cover surfaces, surface water controls, and on-site structures; and grounds maintenance (mowing and cover repairs) at the facilities.  HRC® injections are also conducted at the landfills (i.e., reductive dechlorination of organic contamination exceeding GPS levels) as a barrier treatment to minimize the potential for impacted groundwater to migrate off site.

Project Description & Highlights

The groundwater monitoring program generally includes volatile organic compounds, semivolatile organic compounds, metals, pesticides/ polychlorinated biphenyls, herbicides, and dioxins, but has also included the collection and analysis of total organic carbon, sulfate, volatile fatty acids, and CENSUS DNA samples to aid in the evaluation of the corrective action plan at the site.

Rhea validates the analytical data after each groundwater sampling event.  To minimize the level of effort required for data validation, samples received semi-annually by the analytical laboratory are divided into a maximum of two Sample Delivery Groups (SDGs) at each landfill.  Following validation, the specialist prepares summaries and updates the Electronic Data Deliverable.

Groundwater monitoring reports are submitted to the Virginia Department of Environmental Quality (VDEQ) in accordance with the existing landfill permits.  To date, Rhea has authored or co-authored over 20 major deliverables for these landfills, including numerous remedial measures reports and revisions to the corrective action plan for one of the landfills.

Rhea has provided the federal government with fundamentally sound, cost-effective field services at the landfill facilities since 2006. In 2011, Rhea successfully completed the field work on schedule in the midst of a major revision to one of the landfill permits.

Our knowledge of the old permit, flexibility, and strong relationship with the federal government and the facilities’ personnel allowed us to quickly incorporate changes into the program prior to the finalization of the new permit. 


North Carolina