Incremental Soil Sampling, Unknown Soil Mounds

Incremental Soil Sampling | Brownfield Assessment Grants | Environmental Due Diligence and Risk Management | Phase I Environmental Site Assessment | Phase II Environmental Site Assessment | Underground Storage Tank Assessment

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BLDI was retained by developers to conduct the necessary environmental due diligence involved with the purchase of a large parcel located in Hamburg Township, Michigan. Previous uses of the property included a large manufacturing facility. The large manufacturing facility had been demolished with the property sitting vacant for many years. In that time soil mounds of an unknown origin were placed on the majority central-eastern portion of the Property. Known contamination was present on the property from previous work conducted on the property. Because of this, to aid with the funding of the development BLDI worked with the local government and state to secure grant and loan funds from EGLE under their Brownfield Redevelopment Program.

Incremental sampling (IS) of the non-native soil mounds at the Property was conducted in accordance with the Interstate Technology Regulatory Council (ITRC) Incremental Sampling Methodology guidelines (February 2012) and the EGLE Incremental Sampling Methodology and Applications document (January 2018). The purpose of the completed incremental sampling (IS) was to obtain an unbiased and statistically valid sample that is representative of the entire environmental media while providing reproducible results.

Because of the state funding that was utilized, BLDI worked with EGLE to have a work plan approved and subsequently executed. The Property was divided into three decision units (DUs). A total of 50 equal-volume increments were collected following a random systematic method from each DU to obtain an unbiased, statistically valid estimate of the mean value of the pre-determined analytes of concern within the DUs. Two replicates (collected from different soil piles) were collected from one of the DUs, as approved by EGLE staff, for a total of 150 increments (and subsequently three samples) taken from that particular DU.

The five incremental soil samples collected from the Property were submitted for laboratory analysis of volatile organic compounds (VOCs), polynuclear aromatic hydrocarbons (PNAs), and Michigan 10 Metals (arsenic, barium, cadmium, chromium (total), copper, lead, mercury, selenium, silver, and zinc).

The IS results allowed the developers to properly characterize the soils to ensure proper onsite management for their development. Other phases of this project are currently ongoing including an abandoned underground storage tank removal.