Performed extensive field sampling, environmental assessments, data management, graphical presentation, and reporting for a natural gas transmission company engaged in the interstate transmission of natural gas through a series of subsurface pipelines and compressor stations. Detection of PCBs in soils at compressor stations resulted in the initiation of a program to characterize PCBs as well as other hazardous substance list (HSL) compounds at compressor stations in Texas, Louisiana, Mississippi, Alabama, Tennessee, Kentucky, Ohio, Pennsylvania, and New York. The HSL compounds include the specific constituents from the Target Compound List/Target Analyte List (TCL/TAL) identified in the current EPA Contract Laboratory Program. Performed on and off-site characterization work which included soil and groundwater screening for the presence of PCBs and HSLs. Generally, this work involved vertical and horizontal soil and sediment sampling to characterize the extent of soil impact and the installation of several monitoring wells into the uppermost permeable saturated zone and subsequent groundwater monitoring for PCBs and HSL compounds at each of the compressor stations.
The client engaged us as its nation-wide groundwater consultant in 1995. Since that time, our firm has applied various redevelopment and “low-flow” sampling techniques and other innovative and standard investigative techniques to groundwater assessment, groundwater remediation and long-term monitoring at over 35 compressor stations nation-wide. These stations are located in Texas, Louisiana, Mississippi, Alabama, Tennessee, Kentucky, Ohio, Pennsylvania, and New York. Our proposed strategies have reduced the clientʼs initial estimations of cost of its groundwater program by approximately 75 percent. Our firm has also assisted the client with the establishment of nation-wide groundwater strategies and priorities, interactions with state and federal regulatory agencies on groundwater- related issues, and the “risk-based” closure of many of its groundwater sites.