Luke Waterdog Recreation Annex

Luke Waterdog Recreation Annex | Site History

2015 – 2017The US Air Force moved forward with an in-situ remediation technical approach.  Activated carbon and sulfate bioremediation compound injection was tested as a remediation method. Groundwater monitoring and reporting continued.

2014: Luke AFB began a remedial pilot test work plan along with a remedial design characterization report for the site. Surface water and groundwater sampling continued.

2011 – 2012: Two new wells MW-15 and MW-16 were installed in 2011 as part of a data gap report that was submitted in 2012. Groundwater monitoring and sampling continued.

2010: Additional groundwater monitoring wells were installed at the site to further define the release of petroleum hydrocarbons. Further soil and sediment samples from Apache Lake were collected in the effort to comply with the UST closure requirements.  The leaked fuel is primarily contained in fractured granite bedrock that exists below the site. (The well network will be integral in evaluating natural attenuation of the hydrocarbons at the site.)

2008 – 2009: Luke AFB and ADEQ agreed upon a No Further Action (NFA) with MNA project approach going forward that included two initial phases of site characterization fieldwork, followed by eight quarters of long-term groundwater monitoring. A Site Characterization Work Plan (SCWP), Sampling and Analysis Plan (SAP) and Health and Safety Plan (HASP) that addressed the performance of the following tasks was submitted:

  • Monitoring well maintenance and replacement program
  • Soil boring installation and soil sampling and analysis
  • Installation of additional monitoring wells
  • Groundwater sampling and analysis
  • Surface water sampling and analysis

2007: In February, four 120-foot long refraction seismic surveys were completed. A 12-channel signal enhancement seismograph and geophone array was deployed at 10-foot spacings. Both compression (p-wave) seismic refraction data and surface wave for shear wave (s-wave) refraction microtremor (Remi) data was collected. In general, a layer of low velocity material is indicated to be present across the site to depths of about 1 to 20 feet. Results were consistent with a deeper horizon within the alluvium that is more highly weathered and fractured, or perhaps even faulted, than the overlying portion of the weathered rock mass.

Luke AFB and the Air Force Center for Engineering and the Environment (AFCEE) planned to implement a blast-enhanced fracturing (BEF) program at Waterdog to increase the connectivity and conductivity of the fractured bedrock formation underlying the site. The BEF approach utilized explosive charges installed in strategically located borings at the site which, when detonated, would cause the rock to crumble and crack, creating a greater hydraulic and pneumatic transmissivity. A Remedial Action Work Plan (RAWP) was prepared for these activities and submitted to ADEQ late in 2006 for review and approval. After extensive discussion between ADEQ and Luke AFB, it was subsequently decided that a BEF program would not be executed and other remediation strategies would be evaluated.

2003 – 2005: Two Phase Extraction (TPE) (Bioslurper) system component was installed in March of 2003, was fully operational in October 2003, and continued to operate until September 2005. The TPE component included a five horsepower liquid ring pump, slurp tubes, surface piping, manifold and controls. A liquid ring pump is essentially a highly efficient blower, capable of gas and simultaneous fluid (water and LNAPL) extraction.

In an effort to quantify aquifer parameters and LNAPL behavior, a bail down testing was conducted. Bail down testing for LNAPL thickness recovery was conducted in March 2003.

In accordance with Maricopa County Air Permit air sampling was conducted in February and May 2005. The system oxidized approximately 53 pounds of hydrocarbons in 2005. During 2005, four wells were plumbed to the SVE system. Two wells were plumbed to the TPE “slurping” component.