We've made some changes to EPA.gov. If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Red Hill

Groundwater Flow Patterns at Red Hill

Better understanding the flow patterns of groundwater in the subsurface is a critical first step in the investigation of contamination at the Red Hill facility.

While most parties agree that groundwater generally flows from the mountains towards the ocean, there are specific geologic characteristics in the area around Red Hill that may cause some groundwater to flow in directions other than directly towards the ocean. Understanding these geologic features is essential in determining the direction of groundwater flow in the Red Hill area.

Groundwater flow modeling has been performed in the past by the Navy, but there are still uncertainties that need to be addressed to ensure that the modeled predictions of groundwater flow is accurate. At this time, a better understanding of the area’s geology is needed before any drilling for the purposes of locating leaked fuel under and adjacent to the Red Hill Tanks is considered. The results of the modeling efforts, both for groundwater flow and contaminant fate and transport, will inform decisions on the feasibility and necessity of recovering any leaked fuel.

On September 8, 2017 the Navy submitted the Groundwater Model Evaluation Plan (below). This plan provides details on the Navy's work to update previous Red Hill groundwater models using newly acquired data and the use of new modeling codes.

If you experience a problem reading a document with assistive technology, please contact us.


You may need Adobe Reader to view files on this page. See EPA’s About PDF page to learn more.
  • Groundwater Flow Model Progress Report 03, RHBFSF, JBPHH 3 December 2017 [Revision 00] (PDF)(22 pp, 8 MB, 12/03/2017)
    This Groundwater Flow Model Progress Report is the third in a series of modeling progress reports that describes the technical status of the groundwater flow modeling effort being conducted for the Investigation and Remediation of Petroleum Product Releases and Groundwater Protection and Evaluation project at the Red Hill Bulk Fuel Storage Facility, Joint Base Pearl Harbor-Hickam, O‘ahu, Hawai‘i.
  • Red Hill Groundwater Model Evaluation Plan 8 Sept 2017 (PDF)(72 pp, 6 MB, 09/08/2017)
    Groundwater Model Evaluation Plan, Investigation and Remediation of Releases and Groundwater Protection and Evaluation, Red Hill Bulk Fuel Storage Facility - JOINT BASE PEARL HARBOR-HICKAM, O‘AHU, HAWAI‘I – September 8, 2017 [Revision 00]