Former Knox Lumber and Minneapolis Moline Site Cleanup
Landmark conducted a Phase II Investigation, prepared a Response Action Plan, designed and remediated a 10-acre property in Hopkins prior to its redevelopment into a new state-of-the-art automobile sales and service facility. The new building and asphalt parking areas covered most of the property and Landmark was able to negotiate cleanup goals with the MPCA that allowed for marginally impacted soil to remain on-site beneath these features, which resulted in a significant cost savings.
The redevelopment required significant earthwork including excavation for utilities, soil correction under the building, site grading and an underground stormwater retention system. After excavating known hot spot areas for metals, polynuclear aromatic hydrocarbons and petroleum contamination, several contingency issues were successfully managed including unexpected petroleum-impacted soil, asbestos containing material, and contaminated groundwater. Landmark designed an innovative soil vapor venting system by constructing two vent pipes equipped with a rotary turbine to aggressively vent the stormwater system and prevent vapor build up.