Problems/Comments

The Muldoon Greenhouses occupied what are now Tracts A, B, C, and D of the Muldoon Estates Subdivision, and were in use from 1968 until the property was sold in approximately 2004. As of 2004, the Muldoon Greenhouses complex included a greenhouse, shed, residence with garage, and barn. A hazardous materials survey was conducted on the buildings in October 2007. Asbestos containing materials (ACMs) and lead-based paint were identified as materials of environmental concern within the buildings, as were some batteries and mercury-containing thermostats. The buildings were demolished in 2009, in accordance with the required protocols for the identified hazardous materials. A Phase I environmental site assessment (ESA) of what are now known as Tracts A, B, C and D of the Muldoon Estates Subdivision was completed in 2004 and revealed the following: •Surface stains were observed in the maintenance/storage area of the greenhouse and shed floor; •A 500-gallon gasoline underground storage tank was reportedly removed from the property in 1989; no evidence of release was noted by the operator, but it is unknown whether surrounding soil was tested at the time of removal; •Heating oil tanks may have been used at the property between 1968 and 1974, since the utility company asserts natural gas was not installed until 1974, contrary to the property owner’s statement that natural gas was used at the target property from 1968 on; •Pesticide treatments were used in the greenhouse every two weeks in the summer; plant runoff was discharged to the ground surface leading to the potential for infiltration into soil and groundwater; •On-site debris included non-operational vehicles and used tanks; and •ACM/lead-based paints were of concern within the buildings. Recommendations of the Phase I included characterizing the impacted soils, cleaning up debris, evaluating the underlying soils, and completing an ACM/lead based paint analysis. The ACM/lead paint analysis was completed in 2007 prior to the buildings being demolished. In 2008 the MOA initiated a project to relocate Chester Creek from Tract A of Muldoon Estates to Tract D to improve drainage and alleviate yearly flooding at the Muldoon and DeBarr Roads intersection. The project will also provide better fish passage and improve water quality through replacement of an oil and grit separator. The property was replatted to designate a separate tract (Tract D) for the relocated Chester Creek. A geotechnical investigation was completed in 2010 that included very basic contaminant sampling along the proposed realignment within Tract D (adjacent to Tract A). Several contaminants were detected within Tract D below Alaska Department of Environmental Conservation (DEC) regulatory levels. No contamination has been confirmed by sampling within Tract A as of 2011. The Municipality of Anchorage applied for a Targeted Brownfields Assessment (TBA) of Tract A from the U.S. Environmental Protection Agency in December 2011. The TBA request asked for an updated Phase I ESA of the property, as well as Phase II sampling to determine what, if any, contaminants are onsite and in what quantities.

Action Information

Contaminant Information

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Requirements

No associated sites were found.