Town of Weston Limited Removal Action

Town of Weston Limited Removal Action

This project involved a Limited Removal Action (LRA) for remedial actions undertaken by CommTank at the former library in the Town of Weston, Massachusetts.  These remedial actions were initiated and completed under the provisions of a LRA which is outlined in the Massachusetts Contingency Plan (MCP) at 310 CMR 40.0318.  The LRA was conducted following the removal of a 500-gallon single wall steel Aboveground Storage Tank (AST) containing No. 2 fuel oil.

Aboveground Storage Tank Removal 

Side-wall of leaking oil storage tank

Sidewall of the rectangular oil tank shows metal corrosion

CommTank removed a 500-gallon aboveground storage tank containing No. 2 fuel oil located within a vault in the basement of this property. Based on oil stains found on the floor and vault walls a subsurface investigation consisting of five soil borings was conducted.

Aboveground tank vault with oil stain on wall

One soil sample was taken from a soil boring and submitted to ChemServe Environmental Analysts in Milford, New Hampshire, a state-certified analytical laboratory for extractable petroleum hydrocarbon (EPH) analysis.  Headspace readings of Total Volatile Organic Vapor (TVOV) concentrations of 8.0 ppmv at depths of 0’-2’ and 4.0 ppmv from depths of 2’-4’ were recorded. CommTank received analytical results from the laboratory indicating that the soil from the depth of 0’-2’ had extractable petroleum hydrocarbon (EPH) compounds detected in concentrations that exceeded MADEP Reportable Concentrations for S-1 category soil (RCS-1).  RCS-1 standards are applicable at residential properties in Massachusetts.

Contaminated Soil Excavation and Disposal

Contaminated soil excavation in basement under an Massachusetts LRA

The removal of petroleum contaminated soil (PCS) performed at the former Weston library was completed under the provisions of a LRA.  A total of 11 tons of PCS was excavated and transported under Bill of Lading (BOL) from the site to Environmental Soil Management, Inc. (ESMI) in Loudon, New Hampshire for disposal.  Following the completion of the PCS excavation, post-remedial soil samples were collected from the remaining soil in the excavated area and analyzed for EPH.  The analytical laboratory results indicated all contaminant concentrations were below applicable MCP RCS-1 standards.

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