Lakeshore Market - Nampa
The Lakeshore Market remodeled storefront.
Since 1968, Lakeshore Market, located at 9031 Lake Shore Drive, in Nampa, Idaho, has been a retail fueling facility and convenience store. The site is approximately 27,000 square feet in size and has had several environmental concerns over the years.
In August 1989, the Idaho Department of Environmental Quality (DEQ) was notified that ice from a dispenser in the convenience store tasted and smelled like gasoline. The water that served the store and ice dispenser came from a shallow domestic well, and laboratory analysis of DEQ samples taken from the well indicated the presence of petroleum contamination.
When state Highway 45 was widened back in 1968, tanks, piping, and dispensers were moved to another location on the property, and in 1990, the tanks were replaced with new ones. DEQ did not learn that the new installation had taken place until 1992 when an underground storage tanks form was submitted.
In 1996, a neighboring property owner contacted DEQ because water from a domestic well smelled like gasoline. A site assessment indicated the presence of petroleum contamination in the subsurface soils and ground water. A new well was installed and the impacted well was abandoned.
A remediation system was installed in 2002 to treat contaminated ground water, and it operated until 2007. The system had very little success in remediating ground water conditions to acceptable levels protective of human health and the environment because of the treatment media selected combined with the subsurface geological conditions at the site.
The property was purchased in February 2006 by current owner, Hardeep Singh, as an "owner will carry" transaction.
Limited site investigations were conducted, however, data gaps existed that needed to be addressed prior to selecting a remediation alternative that would be effective in the challenging subsurface conditions.
Mr. Singh faced several issues with regards to the property. The storefront was in poor shape and the on-site stormwater collection system had failed and needed updated. Also, the Idaho Transportation Department and Nampa Highway District had serious safety concerns about the lack of controlled ingress/egress and the large amounts of water in the parking lot because of the failed stormwater system. During winter months when temperatures were below freezing, cars driving through the water onto Lake Shore Drive created icy conditions at the Highway 45 stop sign, which resulted in dangerous, slick conditions at the intersection.
The lack of ingress/egress control and standing water from the failed stormwater system.
In 2007, DEQ launched the Community Reinvestment Pilot Project (Pilot). The project was designed to help eligible participants with 70% of the remediation costs as long as they joined the Voluntary Cleanup Program. Mr. Singh joined the Voluntary Cleanup Program in May 2007 and was accepted into the Pilot program at the same time.
To adequately address the subsurface contamination, further assessment was needed and a cleanup plan needed to be developed.
To develop a comprehensive cleanup plan, choosing the correct remediation approach for additional site assessment was necessary. The DEQ Brownfields Program conducted on-site and off-site assessments to help Mr. Singh leverage his resources to update the storefront, replace the stormwater system, control ingress/egress for public safety, and to cover his 30% portion of anticipated remediation costs.
The assessments adequately addressed the data gaps. High levels of dissolved petroleum products including benzene, toluene, ethylbenzene, naphthalene, and xylenes were found in the shallow ground water at the site. Benzene, ethylbenzene, and naphthalene are known carcinogens. Currently, subsurface conditions pose a risk to human health through possible ingestion of the shallow ground water by on-site commercial workers, and are the primary exposure pathway for off-site receptors. These off-site receptors are potential residential occupants to the south and a mixture of residential and commercial occupants to the west. There is also the possible risk of vapor inhalation via vapor migration from impacted ground water into buildings. This pathway has not been determined to be complete and will be evaluated through subslab soil vapor monitoring inside the store, and soil vapor monitoring outside.
A consultant for Mr. Singh used the Brownfields assessment data to develop a Voluntary Remediation Work Plan, and to select appropriate remediation technology for the site. Chemical oxidative sparging was chosen as the preferred remedy in the final plan that was approved by DEQ in May 2011.
Mr. Singh received a $280,000 loan through the petroleum Revolving Loan Fund administered by Sage Community Resources to fund the cleanup, all prior to the Pilot rebate that would be issued after the cleanup was complete.
The DEQ Brownfields Program provided $65,000 in support of on-site and off-site assessment activities. Mr. Singh spent approximately $100,000 on improving the building storefront, signage, and canopy, as well as updating the underground storage tank and piping leak detection system. He expended $60,000 to fix and update the stormwater collection system and to control the ingress/egress from the site at Lake Shore Drive and Highway 45, which satisfied the Nampa Highway District and Idaho Transportation Department’s safety concerns (see pictures below).
By utilizing the DEQ Brownfields Program, Mr. Singh made infrastructure improvements to his property and updated the dilapidated building.
Ingress/egress was controlled by stormwater swale along Lake Shore Drive.