United Builders

The site is located in the northeast corner of what is now a Safeway parking lot and fuel facility.

Three separate soil and groundwater investigations took place on the subject property between 1992 and 2001. Petroleum hydrocarbon contamination was identified in the vicinity of former underground storage tanks and dry wells located in the north-central portion of the property. This contamination was attributed to United Builders, a former property owner. This contamination was found to be unrelated to contamination on the west side of the property that originated from a release at a former gas station (see the Tiger Oil 24th Ave & W Nob Hill site).

Soil excavation was conducted in 2004. Contaminated soils were excavated from two areas in the north-central portion of the site. Confirmation samples collected from the limits of the excavation indicated that remaining soils did not contain petroleum hydrocarbons at concentrations above Model Toxics Control Act (MTCA) Method A cleanup levels. An environmental covenant was recorded for the property due to the presence of contamination on another portion of the property related to a release from an adjacent property to the west. Ongoing remedial activities continue to address the contamination originating from this adjacent property.

Based upon cleanup activities and the recording of the restrictive covenant, Ecology has determined the site is no longer a threat to human health and the environment. Ecology issued a no further action determination in May 2015.

Periodic reviews are conducted every 5 years by Ecology for sites that have institutional controls. The review is intended to examine the effectiveness of cleanup activities and to assure the continued protection of human health and the environment.

A Five-Year Periodic Review was completed for this site in December 2009 addressing contamination at the property not associated with the adjacent Tiger Oil Site contamination at other portions of the same tax parcel.

Periodic review results

The site continues to be occupied by a Safeway Fuel Center and parking lot. The environmental covenant for the site was recorded and is in place. This environmental covenant continues to reduce the potential for human exposure to contaminants.

Soil cleanup levels have not been met at the site; however, the cleanup action for the Property is determined to comply with cleanup standards under WAC 173-340-740(6) (f), since the long-term integrity of the containment system is ensured and the requirements for containment technologies have been met.

It is the conclusion of this review that the remedial actions taken to address the United Builders contamination at the northeast portion of the site are protective of human health and the environment.