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East Palestine Remedial Action Work Plan [1]

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Date: 2023-07

Remedial Action Work Plan Ohio EPA February 10, 2023

www.arcadis.com 3/7

Soil Sa mpli ng

Soil sampling will be completed per the Preliminary Soil Sampling Plan s ubmitted to the Ohio EPA on February 10, 2023. In

Ar ea 1

, the area proximal to the five vinyl chloride cars that were on fire, three transects of surface soil samples at 25-foot spacing w ill be collected. An additional three transects o f surface soil samples and subsurface soil samples at 50-foot spacing will be collected in

Ar ea 2

, the area between the western extent of Area 1 and the No rth Pleasant Drive crossing. Soil sampling efforts will concurrently support site characterization and waste management/waste determinations, and the results are expected to provide additional guidance and specificity to future remedial actions.

Cha racteriza tion of Ground water Impacts

Groundwater monitoring wells will be installed as practicable within and downgradient of source areas to evaluate the nature and extent of groundwater impacts associated with the derailment. While the number and spatial distribution of monitoring wells needed is not yet finalized, an approximate well network can be envisioned including the following elements:



Wells extending roughly along the northern and southern boundaries of the NS RC right of way.



Wells downg radient from the release location, in the direction of groundwate r flow, and betwee n the release location and overburden water wells or sensitive receptors.



A small numb er (e.g . one to thr ee) of hydrogeologically upgradient wells to support e valuation of groundwater flow direction and hydraulic gradient across the site. Wells located between the two active tracks will be avoided wherever possible. Collection of data from these locations involves substantial additional risk at little additional value relative to wells outside of the immediate track footprint. Wells will also be placed to assess potential migration pathways to surface water, supporting (1) measurement of groundwater elevations relative to surface water bodies and (2) measurement of COC concentrations in groundwater near surface water bodies. Following well installation, a periodic groundwater sampling program specifying monitoring locations, constituents, and frequency, will be developed a nd submitted for review.

Re medial Acti on and Objectives

Although the precise nature a nd extent of impacts req uiring remediation is not fully known, t he overall objectives of future remedial actions can be defined now. These objectives include:



Removal of rea dily available separate-phase liquid for purposes of overall COC mass redu ction



Mitigation of ongoing expansion o r migration of COC impacts to th e extent practicable



Protection of ecological or human health re ceptors in Sulphur Run a nd downgr adient surface water bodies



Protection of human health via prevention of exposure to impacted soil posing a direct conta ct risk, impacted drinking water, or impacted soil vapor.



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[1] Url: https://www.scribd.com/document/625600118/East-Palestine-Remedial-Action-Work-Plan

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