Luke Waterdog Recreation Annex

Luke Waterdog Recreation Annex

Location

On 26 acres of land on the east side of Apache Lake in Maricopa County, approximately a half-mile west of Arizona Highway 88 (Apache Trail). The site is approximately 1,940 feet above mean sea-level (AMSL); normal lake elevation is reported at 1,914 feet AMSL.

Contaminants of Concern

Total Petroleum Hydrocarbon (TPH) and benzene, toluene, ethyl benzene, and xylenes (BTEX) in groundwater.  Contaminants of concern may change as new data become available.

Public Health Impact

No known risk at this time. All exposure pathways have been eliminated through remediation or restricted access/use.

Site Hydrogeology

Depth to groundwater ranges from 14 to 27 feet below ground surface, and likely fluctuates according to the rise and fall of the water level in Apache Lake. Based on the topography, and the close proximity of the lake, groundwater flow direction is likely dependent on the elevation of the lake. The groundwater elevation contour map generated from data gathered during this investigation indicates that groundwater flows to the southeast, away from the lake. Apache Lake is therefore, a “losing” lake.

Waterdog is situated on granitic bedrock and weathered granite. Based on the drilling logs, the local geology consists of approximately 4 to 7 feet of silt and/or sand, underlain by alternating weathered and less weathered granitic bedrock. The bedrock has no primary permeability and moderate to high secondary permeability from fractures.

Status

In 2015, Luke Air Force Base submitted the remedial pilot test work plan to evaluate the effectiveness of a new remediation technique using BOS-200®, which consists of activated carbon, sulfate reduction media and micronutrients mixed with a proprietary mixture of petroleum degrading microbes. The work plan was approved in early 2016.

The pilot study was performed in 2016. Annual monitoring and sampling is still being conducted and documented through the submittal and reviews of annual reports.

ADEQ is currently waiting for the pilot study report and the 2016 Annual Report for review.

Community Involvement Activities

There is no community involvement activity associated with this site at this time.