Protecting Public Health and the Environment.

Adare Manor - Boise

View of Adare Manor from West Fairview Ave. (DEQ 2019).

View of Adare Manor from parking lot (DEQ 2019).

Site Background

There have been many past uses on the properties before it was redeveloped into Adare Manor. From the 1940s to early 1980s, the 2403 West Fairview Ave. property was used as bulk storage for petroleum products, as a service station, and as a heavy machinery storage and maintenance site.  From the 1980s to early 1990s, it was used as an equipment yard for Gillingham Construction, Inc. (GCI). The property’s onsite building was most recently used by the Boise Marine Center as a sales room, office, and shop. The west side of the shop was used for boat maintenance.

From the 1940s to mid-1970s, the 2419 West Fairview Ave. property was used as an auto sales and repair shop,  a veterinarian hospital, and an Idaho Power Company storage yard.

Sunborn Fire Map of properties in 1956

In 2014, the city of Boise requested assistance from the DEQ's Brownfields program. The city wanted to auction, trade, or lease the properties for redevelopment.

Former Gillingham Property, Boise Marine was located in building (DEQ, 2014)


Site Investigation Process

The 2403 property’s environmental assessment history began in 1991 when leaking onsite fuel storage tanks contaminated the soil. In February 1992, GCI removed seven underground storage tanks. In 1993, DEQ issued a consent order against GCI. GCI excavated soils in the area between the south edge of the onsite building and the right-of-way of I-184. The overall remediation activities resulted in an excavation approximately 100 feet wide (east to west), 120 feet in length (north to south), and 13 feet in depth. However, there was still soil contamination left in the southeast portion of the 2403 property because people were working in the building during remediation.

The petroleum-contaminated soil (PCS) was removed from the site and placed at a land farm. Seven monitoring wells were installed to sample the ground water for benzene, toluene, ethylbenzene, and xylene. From May 1994 to June 1995, the ground water was monitored and sampled quarterly, showing fluctuating contamination results. DEQ requested additional information to identify any potential down-gradient receptors. A search on the Idaho Department of Water Resources website identified that monitoring wells were drilled at the adjacent property to the southeast. DEQ mentioned that property as a possible source for contamination, as the site originally extended under what is now I-184. However, during construction planning of I-184, consultants sampled and tested the area using an excavation backhoe and digging test pits. The bottom of the test pits were approximately 5 feet below ground surface and the known contamination depth from previous assessment work was noted at 10–11 feet. No ground water sampling was done at the time of I-184’s construction. Given the location of contamination, which indicates a smear zone with water table fluctuations, the source of the contamination was most likely off-site. Despite the remaining contamination in the southeast, the consent order was terminated and the case was closed based upon a final assessment.   

DEQ’s Brownfields program funded phase I and phase II ESAs for the City of Boise from 2014-2016. The assessments cleared the 2419 property, but revealed residual contamination in the southern portion of the 2403 property. DEQ Brownfields program addressed the issue of historical contamination by placing an environmental covenant on a restricted area, including the southeast portion, of the 2403 property due to residual soil concentrations of naphthalene and benzene(a)pyrene contamination.

Pacific West Communities (Developer) hired TerraGraphics (now Alta) to develop a soil management plan (SMP) to meet DEQ requirements.  The SMP established a plan for PCS and guidance for the contractor to identify, handle, and store the PCS until disposal.

Total Assessment funds expended—$ 107,016.00

Acreage assessed— 2.508 acres

Crucial Collaboration

Adare Manor is a success because many community and regional partners came together and contributed vital resources. The following partnerships helped the redevelopment of the property:

  • City of Boise
  • Idaho Housing and Finance Association
  • Capital City Development Corporation
  • Investor Partners
    • Zions Bancorporation
    • Richman Group
    • American Express

Low-Income Housing Tax Credits were purchased by the Richman Group and American Express, which provided the much-needed equity to create affordable housing.


Adare Manor Ribbon Cutting Ceremony


This new affordable and workforce housing development opened on October 29, 2019. This five–story, 134-unit apartment complex was a success because of the dedication by Northwest Integrity Housing Co., The Pacific Companies, and Thomas Development Co. The project cost $28 million and is home to income-eligible individuals and families. There are 72 one-bedroom units, 55 two-bedroom units, and 7 three-bedroom units. 121 units are subsidized.


Tot Lot (DEQ, 2019)

Raised Garden Beds (DEQ, 2019)

Staff Contacts

Brownfields Analyst
Tina Elayer
DEQ Boise Regional Office
1445 N. Orchard St.
Boise, ID 83706
(208) 373-0563

Related Pages

Waste Management and Remediation

Brownfields in Idaho

Brownfields Success Stories