|
News
Regulatory Links
Proposal Request
Community Involvement
Site Map
|
 |
Groundwater
Monitoring, Landfill
Since 1994, HRP has conducted quarterly groundwater monitoring
at this landfill. The current monitoring program includes the
collection of “low-flow” groundwater samples using dedicated
sampling bladder pumps at 30 monitoring wells and the collection
of surface water samples from two adjacent rivers. Field
measurements collected during well purging and surface water
sampling variously include water sample elevation or depth, pH,
air and/or water temperature, turbidity, salinity, dissolved
oxygen, clarity, specific conductance, and/or
oxidation-reduction potential (ORP).
Pursuant to several groundwater discharge permits, the surface
water and groundwater samples are analyzed by a Connecticut
certified testing laboratory for a variety of analytes,
including:
-
Landfill
leachate parameters
-
Volatile
organic compounds (VOCs)
-
Total metals,
selected dissolved and total metals
-
Cyanide
-
Radioactivity
(radium, gross alpha, gross beta)
-
Pesticides
(select wells)
HRP also collects
numerous quality assurance/quality control (QA/QC) samples
including blind duplicates for select wells, and five trip
blanks. At this site, because sampling equipment is dedicated at
each sample location, equipment blanks are not required. Lined
ash disposal area leachate sampling and treated leachate
discharge sampling is also conducted by HRP.
Currently, in conjunction with the quarterly sampling events,
zone of influence compliance monitoring is conducted at select
wells for parameters that were chosen based upon the findings of
historic monthly analyses of site groundwater. The monthly
ground water zone of influence compliance monitoring was
conducted in 1996/1997 by HRP for the purpose of compiling a
background database of sampling results from twelve monthly
sampling events at six (6) compliance monitoring wells at the
site.
The findings of the quarterly sampling events are reported to
the client, the local municipality, the Connecticut Department
of Environmental Protection, and the federal Environmental
Protection Agency in detailed quarterly reports. Annually, the
monitoring results are summarized in a comprehensive report,
which includes:
-
Summaries of
field measurements and laboratory analyses
-
Temporal
changes in groundwater quality
-
Ground water
elevations and flow directions
-
The nature and
extent of contaminant plumes
-
Impacts to
adjacent surface waters and to area water supply wells
HRP is currently
preparing an Environmental Condition Assessment Form (ECAF) for
the landfill.
Subsurface Hydrogeological Investigation, Former Specialty
Chemical Facility
HRP Associates, Inc. designed and implemented a site assessment
and subsurface hydrogeologic investigation at the site of a
former specialty chemical research, development, production and
training facility. This investigation included extensive
background research of historical site use and area
hydrogeology, ground penetrating radar, test boring, monitoring
well and microwell installations, soil and groundwater sample
analysis, and soil gas surveys. Various historical site
activities and multiple building development created a large
number of discrete contaminant sources throughout the site. The
presence of multiple aquifers dictated complex subsurface
investigation methodologies. Double casing and grouting
techniques were used to prevent aquifer cross-contamination and
ensure the collection of representative samples. Small diameter
well installation methods were used inside the building. High
solvent concentrations in site soils and groundwater required
the use of Level C and Level B personal protective equipment
during multiple phases of the field work.
Remedial action pilot testing was performed for ground water
pump and treat, soil vapor extraction (SVE), dual phase
extraction and low flow pumping remediation technologies. A
1,000-square foot remediation building was designed and
constructed to house a 60-gallon per minute ground water
recovery system, air stripper with granular activated carbon
filtration, a soil vapor extraction treatment system, and a dual
phase extraction system to recover ground water from an aquitard
with solvent concentrations up to 700 parts per million. In
addition, an underground treatment vault was designed and
installed to house horizontal soil vapor extraction well and low
flow ground water recovery systems. These systems remove
contaminated soil vapors and DNAPL from environmental media
beneath a former manufacturing building. HRP has operated and
maintained these systems for over three years during which time
contaminant mass removal analyses have been performed to
document and optimize remediation system effectiveness.
During this three year period, over 1,000 pounds of
trichloroethylene was removed in the pure product, miscible, and
vapor phases. The following remediation systems are currently
operated and maintained at this site:
-
A 60-gpm
recovery well and tray aeration air stripper;
-
Six vertical
soil vapor extraction well systems with carbon treatment;
-
Nine low flow
TCE DNAPL and highly contaminated ground water recovery
wells;
-
Three
horizontal soil vapor extraction well systems with carbon
treatment installed beneath a building to protect human
health; and
-
An eleven well
dual phase vacuum-enhanced soil vapor extraction and ground
water recovery well system designed to mitigate
contamination within a silt-clay aquitard.
The systems are
inspected weekly and a monthly remediation system influent
sampling program was designed and implemented to evaluate
remediation system performance by contaminant mass removal
criteria, and assure compliance with State and Federal
regulations related to RCRA hazardous waste regulations, state
discharge regulations for treated ground water, and air emission
discharge regulations. HRP is responsible for diagnosing and
repairing all mechanical and operational problems for all
systems. Including quarterly ground water monitoring activities,
HRP manages an annual O&M budget of $175,000 to $200,000. In
addition, HRP prepares comprehensive remediation system
performance and ground water monitoring reports for submittal to
regulatory agencies.
Environmental Site Assessment Investigations,
Fort Trumbull, New London, CT
Since 1998, HRP Associates, Inc. has provided the New London
Development Corporation with environmental site assessment
investigations and remedial action plan development and
oversight in the Fort Trumbull area of New London, Connecticut.
The 90-acre section of New London is under redevelopment
following an approved Municipal Development Plan in which HRP is
an integral part. The commercial, industrial, former military,
and residential properties under consideration for redevelopment
have been evaluated for known and potential sources of
contamination as a result of current or historical activities.
Initially, HRP performed Phase I Environmental Site Assessments
(ESAs) of some 80 different parcels to identify whether
significant environmental concerns are present. The ESAs
included a review of published environmental databases, publicly
available Connecticut Department of Environmental Protection
files, City of New London files, Sanborn Fire Insurance Maps,
and aerial photographs. Site-specific and area-wide Areas of
Concern (AOCs) were identified and Phase II investigations were
designed and implemented.
HRP performed pre- and post-demolition inspections of each
property as access was available. Based upon the site
inspections and Phase I assessment tasks, subsurface
investigations (Phase II and III) were performed on properties
where there are known or suspected contaminant sources. HRP has
completed soil gas surveys, geophysical surveys (i.e., ground
penetrating radar), test borings and ground water monitor well
installations, and collection and analysis of soil and ground
water samples. Comprehensive summary reports (environmental
assessment, remedial action plans, remedial action reports) have
been completed, and HRP is working closely with the Connecticut
Department of Environmental Protection (DEP), the Department of
Economic and Community Development (DECD), the New London
Development Corporation (NLDC), the City of New London, and the
various engineering and construction management contractors
involved in the entire redevelopment process.
Remediation has been completed on a number of large aggregated
parcels. Funding sources include the DECD and the U.S. EPA
through the Brownfields Assessment Demonstration Pilot issued to
the City of New London. Currently, several portions of the
development area have moved to the construction phase where HRP
provides environmental plans and specifications, material
management services, and construction oversight.
For more
information, please contact
Christopher Labbe at 1-800-246-9021
|
|
