Case Study - Asphalt Batch Plant
Project Overview
This industrial site contains an active rock quarry and an active hot-mix asphalt batch plant. Site investigations which began in 1988 resulted in the discovery of historic releases of motor oil, hydraulic oil, and chlorinated solvents. Impacted materials included soil and ground water, and a three-foot thick layer of non-aqueous phase liquid (NAPL) within the bedrock. After approximately 10 years of assorted investigations, remedial pilot tests, and remedial measures conducted by other consulting firms, EnviroSense was hired in 1998 to complete an MCP Phase II Comprehensive Site Assessment. Following successful completion of the Phase II, which included a Method 3 Risk Characterization, EnviroSense was retained to complete a Phase III Remedial Action Plan. The outcome of the Phase III was a Class C Response Action Outcome (RAO). Since filing the Class C RAO, EnviroSense has been involved in periodic compliance monitoring of ground water conditions at the site. EnviroSense has also assisted the client in developing a pro-active approach to remediating the non-aqueous phase petroleum trapped in the bedrock fractures. EnviroSense is currently overseeing the implementation of a pilot test, performed under a Release Abatement Measure (RAM), of an oil recovery system which includes a 30-foot deep, six-foot diameter bedrock product recovery sump, shown above under construction.
EnviroSense Role
- Reviewed, compiled, and analyzed 10 years of consulting reports for inclusion in the Phase II Report.
- Determined the nature and extent of contamination for NAPL in bedrock, dissolved phase petroleum and chlorinated hydrocarbons in a fractured bedrock aquifer, and polynuclear aromatic hydrocarbons in soil, originating from six different historic point sources and one historic non-point source.
- Conducted soil and ground water sampling to support a Method 3 Risk Characterization.
- Conducted an MCP Phase III Identification, Evaluation, and Selection of Remedial Action Alternatives, and prepared a Phase III Remedial Action Plan which resulted in a Class C RAO.
- Conduct periodic compliance monitoring at a network of eight six- to eight-inch diameter bedrock monitoring wells, ranging from 50 to 204 feet deep.
- Worked with the client to develop an approach for the remediation of NAPL in bedrock, towards the goal of attaining a Class A RAO. Developed and implemented a pilot test of the remedial approach, conducted under an MCP RAM Plan written by EnviroSense.
