Sauer
Dump
Baltimore, Maryland
CGS was contracted by the State Superfund Division of the MDE-ERRP to
assist it in remedy implementation at a 2.5-acre illegal dump located
on the shore of Back River near the downtown Baltimore Metropolitan
Area. Major tasks for which CGS has been/will be directly responsible
include a Remedial Investigation/Feasibility Study (RI/FS), Remedial
Design (RD), Wetland Permit Application, Preparation of a Bid
Specification, Community Outreach, and Remedial Construction
Oversight.
The RI included compilation of
data into a searchable database, a historic aerial photograph review,
detailed topographic survey, development of Work Plans, Sampling and
Analysis Plans, and a Health and Safety Plan, collection and analysis
of numerous cross media samples, and wetland delineation and
tidal/groundwater fluctuation studies. Preliminary results from the RI
identified areas of the Site where PCB concentrations in soil exceeded
100 ppm. Further investigation was performed in accordance with TSCA
regulations for sampling bulk PCB remediation waste. Select samples
were analyzed for PCBs through use of immunoassay analysis to reduce
the number of samples submitted to a conventional laboratory thereby
minimizing analytical costs. The investigation identified PCB
concentrations which ranged as high as 33,000 ppm. The assessment of
potential impacts to both human health and ecological receptors
resulted in the identification of unacceptable risks primarily from
PCBs. Metals, and lead in particular, were also identified as a
Contaminants of Concern (COCs).
The FS was performed to
establish remedial action objectives, identify feasible remedial
technologies, and conduct a detailed analysis of remedial alternatives
for the Site and impacted off-site areas. Hot spot removal,
installation of a single barrier cover system, and land use controls
were selected as the remedy for the impacted soil. Sediment removal and
on-site containment were selected as the remedy for impacted sediment.
The preliminary results of the RI/FS, along with a Conceptual Remedial
Design, were presented at a public meeting. USEPA and MDE-ERRP plan to
jointly implement the site remedy. USEPA will perform the hot spot
removal activities, and MDE-ERRP will perform the remaining remedial
activities. CGS was contracted to develop a draft RD for the sediment
removal and installation of the cover system. The cover system design
incorporated the results of preliminary cut and fill calculations,
stability and storm water modeling, and addressed comments resulting
from the public meeting and a meeting with the US Army Corps of
Engineers (USACE). Draft design drawings and a Construction Quality
Assurance/ Quality Control Plan were generated in conjunction with the
draft RD to be utilized as part of the Bid Specification during the
construction bid process. CGS prepared a draft joint MDE/ USACE Wetland
Permit Application to allow remedial action in the impacted wetland
areas. CGS will provide Remedial Construction Oversight to ensure that
the Remedial Design and Bid Specification are properly
implemented.
Southern Shoreline of Site |
On-Site Pond |
ADDITIONAL PROJECT
SUMMARIES:
