SEI was retained to provide technical oversight and coordination for a recharacterization of groundwater flow and hydraulic
containment at the Hyde Park Landfill. This project was managed by the client as a team effort, with frequent meetings with the
consultants (SEI, Conestoga Rovers & Associates, and S.S.Papadopulos & Associates), and regular meetings with the regulatory
agencies. This team effort and close cooperation with the agencies was an effective approach to keeping the project on track and
ensuring that the regulators concerns were incorporated into the site investigations. The investigation was completed in several
steps, resulting in a significant recharacterization of the hydrogeologic conditions in the bedrock, preparation of six major reports,
and satisfaction of the EPA's request for demonstration of hydraulic containment.
|Design, Investigation, & Annual Reporting
|The site groundwater remediation system for the Site was designed by Mr. Sayko in 1991 while working with ERM. System startup
began in 1993. Mr. Sayko has completed annual reporting and provided investigation services (well installation, sampling, reporting)
since system startup, and SEI has provided these services since 2002. The remediation system has been in operation since 1993,
has had three EPA 5-year reviews, and continues to operate without any revisions to the original recovery system design. In a
recent evaluation of the site data, a trend analysis was performed to predict time when remediation would be completed. The trend
analysis was semi-automated, using Excel to fit data but visual inspection and professional judgement to include or delete
anomalous data points fro the trend analysis.
SEI provides technical support and hydrogeologic analysis of groundwater flow and contaminant transport for a former industrial
facility. The site is impacted by VOC and mercury. SEI developed a site conceptual model, 3-D geologic model, groundwater flow
model, prepares work plans for investigations and the annual performance report, and makes presentations to the regulators.
||Atlantic Coastal Plain
|SEI provides technical support and hydrogeologic analysis of the NoMound® innovative on-site waste water treatment system.
Expert testimony was required in a permitting dispute with the State of Florida.
||PA / NY / NJ
SEI provides environmental compliance services to a manufacturing business with facilities in Pennsylvania, New York, and New
Jersey. These services include preparation of State and Federal compliance reports, waste management and minimization support,
and plant inspections.
|Independent Peer Review
SEI provides independent peer review on a large, 3-dimensional, density-driven flow and transport modeling effort. This complex
model, SEAWAT, was developed by a large consulting firm. Due to the complexity of the site geologic conditions and of construction
a large density-driven flow model, SEI reviews and provides input to facilitate an optimal solution and regulatory acceptance.
SEI completed site investigations and reporting for this manufacturing plant in southeastern Pennsylvania. The Act 2 reporting and
notifications were completed by SEI. As a result, a release from liability was issued for VOCs in groundwater using the statewide
Short project summaries are provided below. Contact us for additional details on any project. It the Project Description is highlighted
blue, there is a link to a detailed project description.
|Act 2 Investigation
SEI has developed estimates of past and future VOC plumes in groundwater for an Natural Resource Damages lawsuit. The area of
the VOC plume is used in the calculation of damages. The suit was settled favorable to our client.
||Atlantic Coastal Plain
|Expert Report Preparation
|Vapor Intrusion Investigation
At the request of the USEPA, an extensive vapor intrusion sampling effort was completed in 2011. One hundred samples of indoor,
outdoor, and subiislab samples were collected. SEI is coordinating the installation of two sub-slab depressurization systems.
|Remediation Design & Annual Reporting
|The groundwater remediation system for the Site was designed by Mr. Sayko in 1993 while working with ERM. System startup began
in 1996. Mr. Sayko has completed all annual reportings since system startup. The remediation system has been in continuous
original design. The contaminant mass in the VOC plume has been reduced by 95% and concentration trends suggest MCLs will be
achieved in between 2020 and 2025.