Conceptual Site Model Evaluation to Support Focused Site Characterization – Rockland County, New York

Clark, Amberlee

Conceptual Site Model Evaluation to Support Focused Site Characterization – Rockland County, New York

Tuesday, September 24, 2019: 9:30 a.m.

Amberlee Clark , Wood Environment & Infrastructure Solutions, Inc.

Jean Firth, CG, PG , Wood Environment & Infrastructure Solutions, Inc., Portland, ME

Nathan Vogan, PG , Wood Environment & Infrastructure Solutions, Inc.

This presentation will discuss how refinement of a conceptual site model (CSM) led to a focused remedial investigation (RI). A former manufacturing facility with a deep bedrock production well used halogenated solvents and lubricants. Ten thousand gallons per day of non-contact cooling water generated during manufacturing was discharged to a leachfield for 30 years. Geology of the site consists of fractured sandstone bedrock overlain by dense glacial till deposits.
Bedrock production well testing in 1999 identified site contaminants of concern (COCs ). Site assessments were conducted which identified COCs above groundwater standards in overburden and bedrock groundwater. The original CSM indicated a sole source of contamination originating from the leachfield.
A RI was undertaken to evaluate and address data gaps identified in the original CSM. Data quality objectives and sampling techniques were selected to evaluate contaminant distribution under current site conditions.
Evaluation of the RI data indicates multiple source areas. COC distribution in the bedrock is influenced by the production well pulling contamination downward and against natural groundwater flow. Refinement of the CSM included targeted geophysical logging, aquifer hydraulic testing, and discrete sampling to evaluate fractures and flow potential in the bedrock including matrix diffusion of COCs as a continual source.

Amberlee Clark, Wood Environment & Infrastructure Solutions, Inc.

Ms. Clark is a Geologist with experience in Geographic Information Systems (GIS), Light Detection & Ranging (LiDAR), implementing field investigation and sampling activities, and completing remediation system operations and maintenance (O&M). Her experience includes coordination and oversight of drilling activities including soil boring, monitoring well and injection point installation, as well as groundwater, surface water, concrete, soil, and soil vapor sampling and monitoring. Project experience to date has included activities at both active and inactive facilities and for commercial and public sector clients throughout the northeast United States on various environmental regulatory programs, including RCRA and CERLA.

Jean Firth, CG, PG, Wood Environment & Infrastructure Solutions, Inc., Portland, ME

Ms. Firth is a Certified Geologist with over 25 years’ experience managing investigations and remediation at petroleum and hazardous waste sites. Her experience includes State Superfund in Maine and New York, CERCLA, RCRA and TSCA. Ms. Firth served as Project Manager for Maine Department of Environmental Protection where she managed over 80 sites in the Brownfield and Voluntary Response Action Program. Ms. Firth currently oversees site management activities for several sites in New York State including three closed landfills. Her responsibilities at these facilities included development of Site Management Plans, periodic inspections, long term monitoring, and coordinating maintenance and repairs.

Nathan Vogan, PG, Wood Environment & Infrastructure Solutions, Inc.

Mr. Vogan is a professional geologist with over 10 years of experience focused on leading field investigation efforts and reporting for remediation projects. He has managed multidisciplinary teams composed of Wood team members and subcontractors. He is also responsible for preparing, developing, and writing reports, assessments, and recommendations. Mr. Vogan’s experience as a consultant is broad based and includes the assessment of chlorinated solvents, metals, polychlorinated biphenyl (PCBs), petroleum (manufactured gas plants [MGP]), per- and polyfluoroalkyl substances (PFAs), and other hazardous materials in various media, including soil, bedrock, groundwater, vapor, and sediments.