The facility was the subject of a used motor oil and antifreeze release, as well as a heating oil release., discovered during underground storage tank (UST) removals in 2020 conducted by Coventry Environmental, Inc. (Coventry). RMS conducted a site investigation in October 2020 which include the collection of twelve soil samples and two groundwater samples. The objective of the soil sampling was to delineate the releases and the objective of the groundwater sampling was assess potential impacts to shallow groundwater. No soil concentrations exceeded their most stringent PADEP Statewide Health Standard (SHS) Medium Specific Concentration (MSC). Groundwater analytical data were obtained from two temporary well points, one west of the tank field and one in the center of the tank field. Groundwater analytical results were compared to Residential Statewide Health Standards (RSHS) as presented in 25 Pa. Code Chapter 250. Lead was detected above the groundwater RSHS.
Four (4) USTs were removed by Coventry. The four USTs removed were:
8,000-gallon used motor oil tank at large operations building,
1,500-gallon used motor oil tank at large operations building,
2,000-gallon antifreeze tank at large operations building,
1,000-gallon used motor oil tank at large operations building.
Coventry Environmental along with RMS Environmental mobilized to commence soil remediation at the Site. Using the soil delineation performed at the Site in October, Coventry excavated an area of 61.5 feet x 25.5 feet x 11 feet for a total of 640 cubic yards of soil. Coventry was able to dig down to 11 feet throughout the excavation at which point competent bedrock was encountered and no further excavation occurred. RMS personnel then collected post excavation samples along the four sidewalls of the excavation above the bedrock interface. A total of 910.52 tons of contaminated soil was removed from Site. 736.64 tons of contaminated soil was removed from the waste oil/antifreeze excavation. The remaining 173.8 tons of contaminated soil was from the two heating oil excavations.
RMS oversaw the installation of 3 bedrock monitoring wells down to approximately 45 feet. The bedrock contains numerous near-vertical fractures or joints. Fractures can be developed along bedding planes or occur inclined at steep angles. The degree of fracture development and their orientation are variable between the interbedded layers due to differences in physical properties, including grain size and hardness. Harder, more competent rocks generally show more fracturing than pliable units.
RMS’s groundwater investigation has shown that the bedrock aquifer has not been impacted by the releases from the above-reference USTs.
What’s next: RMS will collect a total of 4 quarterly groundwater samples showing that the groundwater in the bedrock has not been impacted. RMS will submit on behalf of the client a soil and groundwater release of liability to the PADEP for the contaminants of concern showing that the site has been remediated to meet residential statewide health standards.
RMS delineated contaminated soil surrounding three (3) excavations.
RMS oversaw Soil Remediation and collected requisite soil samples
RMS oversaw installation of 3 bedrock monitoring wells
Groundwater Investigation to determine if groundwater in fractured bedrock was impacted